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enumerable: true, value: value });\n \t\tif(mode & 2 && typeof value != 'string') for(var key in value) __webpack_require__.d(ns, key, function(key) { return value[key]; }.bind(null, key));\n \t\treturn ns;\n \t};\n\n \t// getDefaultExport function for compatibility with non-harmony modules\n \t__webpack_require__.n = function(module) {\n \t\tvar getter = module && module.__esModule ?\n \t\t\tfunction getDefault() { return module['default']; } :\n \t\t\tfunction getModuleExports() { return module; };\n \t\t__webpack_require__.d(getter, 'a', getter);\n \t\treturn getter;\n \t};\n\n \t// Object.prototype.hasOwnProperty.call\n \t__webpack_require__.o = function(object, property) { return Object.prototype.hasOwnProperty.call(object, property); };\n\n \t// __webpack_public_path__\n \t__webpack_require__.p = \"\";\n\n \tvar jsonpArray = window[\"webpackJsonp\"] = window[\"webpackJsonp\"] || [];\n \tvar oldJsonpFunction = jsonpArray.push.bind(jsonpArray);\n \tjsonpArray.push = webpackJsonpCallback;\n \tjsonpArray = jsonpArray.slice();\n \tfor(var i = 0; i < jsonpArray.length; i++) webpackJsonpCallback(jsonpArray[i]);\n \tvar parentJsonpFunction = oldJsonpFunction;\n\n\n \t// run deferred modules from other chunks\n \tcheckDeferredModules();\n","/**\n * @module ol/extent\n */\nimport {assert} from './asserts.js';\nimport Corner from './extent/Corner.js';\nimport Relationship from './extent/Relationship.js';\n\n\n/**\n * An array of numbers representing an extent: `[minx, miny, maxx, maxy]`.\n * @typedef {Array<number>} Extent\n * @api\n */\n\n/**\n * Build an extent that includes all given coordinates.\n *\n * @param {Array<module:ol/coordinate~Coordinate>} coordinates Coordinates.\n * @return {module:ol/extent~Extent} Bounding extent.\n * @api\n */\nexport function boundingExtent(coordinates) {\n  const extent = createEmpty();\n  for (let i = 0, ii = coordinates.length; i < ii; ++i) {\n    extendCoordinate(extent, coordinates[i]);\n  }\n  return extent;\n}\n\n\n/**\n * @param {Array<number>} xs Xs.\n * @param {Array<number>} ys Ys.\n * @param {module:ol/extent~Extent=} opt_extent Destination extent.\n * @private\n * @return {module:ol/extent~Extent} Extent.\n */\nfunction _boundingExtentXYs(xs, ys, opt_extent) {\n  const minX = Math.min.apply(null, xs);\n  const minY = Math.min.apply(null, ys);\n  const maxX = Math.max.apply(null, xs);\n  const maxY = Math.max.apply(null, ys);\n  return createOrUpdate(minX, minY, maxX, maxY, opt_extent);\n}\n\n\n/**\n * Return extent increased by the provided value.\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {number} value The amount by which the extent should be buffered.\n * @param {module:ol/extent~Extent=} opt_extent Extent.\n * @return {module:ol/extent~Extent} Extent.\n * @api\n */\nexport function buffer(extent, value, opt_extent) {\n  if (opt_extent) {\n    opt_extent[0] = extent[0] - value;\n    opt_extent[1] = extent[1] - value;\n    opt_extent[2] = extent[2] + value;\n    opt_extent[3] = extent[3] + value;\n    return opt_extent;\n  } else {\n    return [\n      extent[0] - value,\n      extent[1] - value,\n      extent[2] + value,\n      extent[3] + value\n    ];\n  }\n}\n\n\n/**\n * Creates a clone of an extent.\n *\n * @param {module:ol/extent~Extent} extent Extent to clone.\n * @param {module:ol/extent~Extent=} opt_extent Extent.\n * @return {module:ol/extent~Extent} The clone.\n */\nexport function clone(extent, opt_extent) {\n  if (opt_extent) {\n    opt_extent[0] = extent[0];\n    opt_extent[1] = extent[1];\n    opt_extent[2] = extent[2];\n    opt_extent[3] = extent[3];\n    return opt_extent;\n  } else {\n    return extent.slice();\n  }\n}\n\n\n/**\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {number} x X.\n * @param {number} y Y.\n * @return {number} Closest squared distance.\n */\nexport function closestSquaredDistanceXY(extent, x, y) {\n  let dx, dy;\n  if (x < extent[0]) {\n    dx = extent[0] - x;\n  } else if (extent[2] < x) {\n    dx = x - extent[2];\n  } else {\n    dx = 0;\n  }\n  if (y < extent[1]) {\n    dy = extent[1] - y;\n  } else if (extent[3] < y) {\n    dy = y - extent[3];\n  } else {\n    dy = 0;\n  }\n  return dx * dx + dy * dy;\n}\n\n\n/**\n * Check if the passed coordinate is contained or on the edge of the extent.\n *\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @return {boolean} The coordinate is contained in the extent.\n * @api\n */\nexport function containsCoordinate(extent, coordinate) {\n  return containsXY(extent, coordinate[0], coordinate[1]);\n}\n\n\n/**\n * Check if one extent contains another.\n *\n * An extent is deemed contained if it lies completely within the other extent,\n * including if they share one or more edges.\n *\n * @param {module:ol/extent~Extent} extent1 Extent 1.\n * @param {module:ol/extent~Extent} extent2 Extent 2.\n * @return {boolean} The second extent is contained by or on the edge of the\n *     first.\n * @api\n */\nexport function containsExtent(extent1, extent2) {\n  return extent1[0] <= extent2[0] && extent2[2] <= extent1[2] &&\n      extent1[1] <= extent2[1] && extent2[3] <= extent1[3];\n}\n\n\n/**\n * Check if the passed coordinate is contained or on the edge of the extent.\n *\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {number} x X coordinate.\n * @param {number} y Y coordinate.\n * @return {boolean} The x, y values are contained in the extent.\n * @api\n */\nexport function containsXY(extent, x, y) {\n  return extent[0] <= x && x <= extent[2] && extent[1] <= y && y <= extent[3];\n}\n\n\n/**\n * Get the relationship between a coordinate and extent.\n * @param {module:ol/extent~Extent} extent The extent.\n * @param {module:ol/coordinate~Coordinate} coordinate The coordinate.\n * @return {module:ol/extent/Relationship} The relationship (bitwise compare with\n *     module:ol/extent/Relationship~Relationship).\n */\nexport function coordinateRelationship(extent, coordinate) {\n  const minX = extent[0];\n  const minY = extent[1];\n  const maxX = extent[2];\n  const maxY = extent[3];\n  const x = coordinate[0];\n  const y = coordinate[1];\n  let relationship = Relationship.UNKNOWN;\n  if (x < minX) {\n    relationship = relationship | Relationship.LEFT;\n  } else if (x > maxX) {\n    relationship = relationship | Relationship.RIGHT;\n  }\n  if (y < minY) {\n    relationship = relationship | Relationship.BELOW;\n  } else if (y > maxY) {\n    relationship = relationship | Relationship.ABOVE;\n  }\n  if (relationship === Relationship.UNKNOWN) {\n    relationship = Relationship.INTERSECTING;\n  }\n  return relationship;\n}\n\n\n/**\n * Create an empty extent.\n * @return {module:ol/extent~Extent} Empty extent.\n * @api\n */\nexport function createEmpty() {\n  return [Infinity, Infinity, -Infinity, -Infinity];\n}\n\n\n/**\n * Create a new extent or update the provided extent.\n * @param {number} minX Minimum X.\n * @param {number} minY Minimum Y.\n * @param {number} maxX Maximum X.\n * @param {number} maxY Maximum Y.\n * @param {module:ol/extent~Extent=} opt_extent Destination extent.\n * @return {module:ol/extent~Extent} Extent.\n */\nexport function createOrUpdate(minX, minY, maxX, maxY, opt_extent) {\n  if (opt_extent) {\n    opt_extent[0] = minX;\n    opt_extent[1] = minY;\n    opt_extent[2] = maxX;\n    opt_extent[3] = maxY;\n    return opt_extent;\n  } else {\n    return [minX, minY, maxX, maxY];\n  }\n}\n\n\n/**\n * Create a new empty extent or make the provided one empty.\n * @param {module:ol/extent~Extent=} opt_extent Extent.\n * @return {module:ol/extent~Extent} Extent.\n */\nexport function createOrUpdateEmpty(opt_extent) {\n  return createOrUpdate(\n    Infinity, Infinity, -Infinity, -Infinity, opt_extent);\n}\n\n\n/**\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @param {module:ol/extent~Extent=} opt_extent Extent.\n * @return {module:ol/extent~Extent} Extent.\n */\nexport function createOrUpdateFromCoordinate(coordinate, opt_extent) {\n  const x = coordinate[0];\n  const y = coordinate[1];\n  return createOrUpdate(x, y, x, y, opt_extent);\n}\n\n\n/**\n * @param {Array<module:ol/coordinate~Coordinate>} coordinates Coordinates.\n * @param {module:ol/extent~Extent=} opt_extent Extent.\n * @return {module:ol/extent~Extent} Extent.\n */\nexport function createOrUpdateFromCoordinates(coordinates, opt_extent) {\n  const extent = createOrUpdateEmpty(opt_extent);\n  return extendCoordinates(extent, coordinates);\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {module:ol/extent~Extent=} opt_extent Extent.\n * @return {module:ol/extent~Extent} Extent.\n */\nexport function createOrUpdateFromFlatCoordinates(flatCoordinates, offset, end, stride, opt_extent) {\n  const extent = createOrUpdateEmpty(opt_extent);\n  return extendFlatCoordinates(extent, flatCoordinates, offset, end, stride);\n}\n\n/**\n * @param {Array<Array<module:ol/coordinate~Coordinate>>} rings Rings.\n * @param {module:ol/extent~Extent=} opt_extent Extent.\n * @return {module:ol/extent~Extent} Extent.\n */\nexport function createOrUpdateFromRings(rings, opt_extent) {\n  const extent = createOrUpdateEmpty(opt_extent);\n  return extendRings(extent, rings);\n}\n\n\n/**\n * Determine if two extents are equivalent.\n * @param {module:ol/extent~Extent} extent1 Extent 1.\n * @param {module:ol/extent~Extent} extent2 Extent 2.\n * @return {boolean} The two extents are equivalent.\n * @api\n */\nexport function equals(extent1, extent2) {\n  return extent1[0] == extent2[0] && extent1[2] == extent2[2] &&\n      extent1[1] == extent2[1] && extent1[3] == extent2[3];\n}\n\n\n/**\n * Modify an extent to include another extent.\n * @param {module:ol/extent~Extent} extent1 The extent to be modified.\n * @param {module:ol/extent~Extent} extent2 The extent that will be included in the first.\n * @return {module:ol/extent~Extent} A reference to the first (extended) extent.\n * @api\n */\nexport function extend(extent1, extent2) {\n  if (extent2[0] < extent1[0]) {\n    extent1[0] = extent2[0];\n  }\n  if (extent2[2] > extent1[2]) {\n    extent1[2] = extent2[2];\n  }\n  if (extent2[1] < extent1[1]) {\n    extent1[1] = extent2[1];\n  }\n  if (extent2[3] > extent1[3]) {\n    extent1[3] = extent2[3];\n  }\n  return extent1;\n}\n\n\n/**\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n */\nexport function extendCoordinate(extent, coordinate) {\n  if (coordinate[0] < extent[0]) {\n    extent[0] = coordinate[0];\n  }\n  if (coordinate[0] > extent[2]) {\n    extent[2] = coordinate[0];\n  }\n  if (coordinate[1] < extent[1]) {\n    extent[1] = coordinate[1];\n  }\n  if (coordinate[1] > extent[3]) {\n    extent[3] = coordinate[1];\n  }\n}\n\n\n/**\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {Array<module:ol/coordinate~Coordinate>} coordinates Coordinates.\n * @return {module:ol/extent~Extent} Extent.\n */\nexport function extendCoordinates(extent, coordinates) {\n  for (let i = 0, ii = coordinates.length; i < ii; ++i) {\n    extendCoordinate(extent, coordinates[i]);\n  }\n  return extent;\n}\n\n\n/**\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @return {module:ol/extent~Extent} Extent.\n */\nexport function extendFlatCoordinates(extent, flatCoordinates, offset, end, stride) {\n  for (; offset < end; offset += stride) {\n    extendXY(extent, flatCoordinates[offset], flatCoordinates[offset + 1]);\n  }\n  return extent;\n}\n\n\n/**\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {Array<Array<module:ol/coordinate~Coordinate>>} rings Rings.\n * @return {module:ol/extent~Extent} Extent.\n */\nexport function extendRings(extent, rings) {\n  for (let i = 0, ii = rings.length; i < ii; ++i) {\n    extendCoordinates(extent, rings[i]);\n  }\n  return extent;\n}\n\n\n/**\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {number} x X.\n * @param {number} y Y.\n */\nexport function extendXY(extent, x, y) {\n  extent[0] = Math.min(extent[0], x);\n  extent[1] = Math.min(extent[1], y);\n  extent[2] = Math.max(extent[2], x);\n  extent[3] = Math.max(extent[3], y);\n}\n\n\n/**\n * This function calls `callback` for each corner of the extent. If the\n * callback returns a truthy value the function returns that value\n * immediately. Otherwise the function returns `false`.\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {function(this:T, module:ol/coordinate~Coordinate): S} callback Callback.\n * @param {T=} opt_this Value to use as `this` when executing `callback`.\n * @return {S|boolean} Value.\n * @template S, T\n */\nexport function forEachCorner(extent, callback, opt_this) {\n  let val;\n  val = callback.call(opt_this, getBottomLeft(extent));\n  if (val) {\n    return val;\n  }\n  val = callback.call(opt_this, getBottomRight(extent));\n  if (val) {\n    return val;\n  }\n  val = callback.call(opt_this, getTopRight(extent));\n  if (val) {\n    return val;\n  }\n  val = callback.call(opt_this, getTopLeft(extent));\n  if (val) {\n    return val;\n  }\n  return false;\n}\n\n\n/**\n * Get the size of an extent.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {number} Area.\n * @api\n */\nexport function getArea(extent) {\n  let area = 0;\n  if (!isEmpty(extent)) {\n    area = getWidth(extent) * getHeight(extent);\n  }\n  return area;\n}\n\n\n/**\n * Get the bottom left coordinate of an extent.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {module:ol/coordinate~Coordinate} Bottom left coordinate.\n * @api\n */\nexport function getBottomLeft(extent) {\n  return [extent[0], extent[1]];\n}\n\n\n/**\n * Get the bottom right coordinate of an extent.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {module:ol/coordinate~Coordinate} Bottom right coordinate.\n * @api\n */\nexport function getBottomRight(extent) {\n  return [extent[2], extent[1]];\n}\n\n\n/**\n * Get the center coordinate of an extent.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {module:ol/coordinate~Coordinate} Center.\n * @api\n */\nexport function getCenter(extent) {\n  return [(extent[0] + extent[2]) / 2, (extent[1] + extent[3]) / 2];\n}\n\n\n/**\n * Get a corner coordinate of an extent.\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {module:ol/extent/Corner} corner Corner.\n * @return {module:ol/coordinate~Coordinate} Corner coordinate.\n */\nexport function getCorner(extent, corner) {\n  let coordinate;\n  if (corner === Corner.BOTTOM_LEFT) {\n    coordinate = getBottomLeft(extent);\n  } else if (corner === Corner.BOTTOM_RIGHT) {\n    coordinate = getBottomRight(extent);\n  } else if (corner === Corner.TOP_LEFT) {\n    coordinate = getTopLeft(extent);\n  } else if (corner === Corner.TOP_RIGHT) {\n    coordinate = getTopRight(extent);\n  } else {\n    assert(false, 13); // Invalid corner\n  }\n  return (\n    /** @type {!module:ol/coordinate~Coordinate} */ (coordinate)\n  );\n}\n\n\n/**\n * @param {module:ol/extent~Extent} extent1 Extent 1.\n * @param {module:ol/extent~Extent} extent2 Extent 2.\n * @return {number} Enlarged area.\n */\nexport function getEnlargedArea(extent1, extent2) {\n  const minX = Math.min(extent1[0], extent2[0]);\n  const minY = Math.min(extent1[1], extent2[1]);\n  const maxX = Math.max(extent1[2], extent2[2]);\n  const maxY = Math.max(extent1[3], extent2[3]);\n  return (maxX - minX) * (maxY - minY);\n}\n\n\n/**\n * @param {module:ol/coordinate~Coordinate} center Center.\n * @param {number} resolution Resolution.\n * @param {number} rotation Rotation.\n * @param {module:ol/size~Size} size Size.\n * @param {module:ol/extent~Extent=} opt_extent Destination extent.\n * @return {module:ol/extent~Extent} Extent.\n */\nexport function getForViewAndSize(center, resolution, rotation, size, opt_extent) {\n  const dx = resolution * size[0] / 2;\n  const dy = resolution * size[1] / 2;\n  const cosRotation = Math.cos(rotation);\n  const sinRotation = Math.sin(rotation);\n  const xCos = dx * cosRotation;\n  const xSin = dx * sinRotation;\n  const yCos = dy * cosRotation;\n  const ySin = dy * sinRotation;\n  const x = center[0];\n  const y = center[1];\n  const x0 = x - xCos + ySin;\n  const x1 = x - xCos - ySin;\n  const x2 = x + xCos - ySin;\n  const x3 = x + xCos + ySin;\n  const y0 = y - xSin - yCos;\n  const y1 = y - xSin + yCos;\n  const y2 = y + xSin + yCos;\n  const y3 = y + xSin - yCos;\n  return createOrUpdate(\n    Math.min(x0, x1, x2, x3), Math.min(y0, y1, y2, y3),\n    Math.max(x0, x1, x2, x3), Math.max(y0, y1, y2, y3),\n    opt_extent);\n}\n\n\n/**\n * Get the height of an extent.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {number} Height.\n * @api\n */\nexport function getHeight(extent) {\n  return extent[3] - extent[1];\n}\n\n\n/**\n * @param {module:ol/extent~Extent} extent1 Extent 1.\n * @param {module:ol/extent~Extent} extent2 Extent 2.\n * @return {number} Intersection area.\n */\nexport function getIntersectionArea(extent1, extent2) {\n  const intersection = getIntersection(extent1, extent2);\n  return getArea(intersection);\n}\n\n\n/**\n * Get the intersection of two extents.\n * @param {module:ol/extent~Extent} extent1 Extent 1.\n * @param {module:ol/extent~Extent} extent2 Extent 2.\n * @param {module:ol/extent~Extent=} opt_extent Optional extent to populate with intersection.\n * @return {module:ol/extent~Extent} Intersecting extent.\n * @api\n */\nexport function getIntersection(extent1, extent2, opt_extent) {\n  const intersection = opt_extent ? opt_extent : createEmpty();\n  if (intersects(extent1, extent2)) {\n    if (extent1[0] > extent2[0]) {\n      intersection[0] = extent1[0];\n    } else {\n      intersection[0] = extent2[0];\n    }\n    if (extent1[1] > extent2[1]) {\n      intersection[1] = extent1[1];\n    } else {\n      intersection[1] = extent2[1];\n    }\n    if (extent1[2] < extent2[2]) {\n      intersection[2] = extent1[2];\n    } else {\n      intersection[2] = extent2[2];\n    }\n    if (extent1[3] < extent2[3]) {\n      intersection[3] = extent1[3];\n    } else {\n      intersection[3] = extent2[3];\n    }\n  } else {\n    createOrUpdateEmpty(intersection);\n  }\n  return intersection;\n}\n\n\n/**\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {number} Margin.\n */\nexport function getMargin(extent) {\n  return getWidth(extent) + getHeight(extent);\n}\n\n\n/**\n * Get the size (width, height) of an extent.\n * @param {module:ol/extent~Extent} extent The extent.\n * @return {module:ol/size~Size} The extent size.\n * @api\n */\nexport function getSize(extent) {\n  return [extent[2] - extent[0], extent[3] - extent[1]];\n}\n\n\n/**\n * Get the top left coordinate of an extent.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {module:ol/coordinate~Coordinate} Top left coordinate.\n * @api\n */\nexport function getTopLeft(extent) {\n  return [extent[0], extent[3]];\n}\n\n\n/**\n * Get the top right coordinate of an extent.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {module:ol/coordinate~Coordinate} Top right coordinate.\n * @api\n */\nexport function getTopRight(extent) {\n  return [extent[2], extent[3]];\n}\n\n\n/**\n * Get the width of an extent.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {number} Width.\n * @api\n */\nexport function getWidth(extent) {\n  return extent[2] - extent[0];\n}\n\n\n/**\n * Determine if one extent intersects another.\n * @param {module:ol/extent~Extent} extent1 Extent 1.\n * @param {module:ol/extent~Extent} extent2 Extent.\n * @return {boolean} The two extents intersect.\n * @api\n */\nexport function intersects(extent1, extent2) {\n  return extent1[0] <= extent2[2] &&\n      extent1[2] >= extent2[0] &&\n      extent1[1] <= extent2[3] &&\n      extent1[3] >= extent2[1];\n}\n\n\n/**\n * Determine if an extent is empty.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {boolean} Is empty.\n * @api\n */\nexport function isEmpty(extent) {\n  return extent[2] < extent[0] || extent[3] < extent[1];\n}\n\n\n/**\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {module:ol/extent~Extent=} opt_extent Extent.\n * @return {module:ol/extent~Extent} Extent.\n */\nexport function returnOrUpdate(extent, opt_extent) {\n  if (opt_extent) {\n    opt_extent[0] = extent[0];\n    opt_extent[1] = extent[1];\n    opt_extent[2] = extent[2];\n    opt_extent[3] = extent[3];\n    return opt_extent;\n  } else {\n    return extent;\n  }\n}\n\n\n/**\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {number} value Value.\n */\nexport function scaleFromCenter(extent, value) {\n  const deltaX = ((extent[2] - extent[0]) / 2) * (value - 1);\n  const deltaY = ((extent[3] - extent[1]) / 2) * (value - 1);\n  extent[0] -= deltaX;\n  extent[2] += deltaX;\n  extent[1] -= deltaY;\n  extent[3] += deltaY;\n}\n\n\n/**\n * Determine if the segment between two coordinates intersects (crosses,\n * touches, or is contained by) the provided extent.\n * @param {module:ol/extent~Extent} extent The extent.\n * @param {module:ol/coordinate~Coordinate} start Segment start coordinate.\n * @param {module:ol/coordinate~Coordinate} end Segment end coordinate.\n * @return {boolean} The segment intersects the extent.\n */\nexport function intersectsSegment(extent, start, end) {\n  let intersects = false;\n  const startRel = coordinateRelationship(extent, start);\n  const endRel = coordinateRelationship(extent, end);\n  if (startRel === Relationship.INTERSECTING ||\n      endRel === Relationship.INTERSECTING) {\n    intersects = true;\n  } else {\n    const minX = extent[0];\n    const minY = extent[1];\n    const maxX = extent[2];\n    const maxY = extent[3];\n    const startX = start[0];\n    const startY = start[1];\n    const endX = end[0];\n    const endY = end[1];\n    const slope = (endY - startY) / (endX - startX);\n    let x, y;\n    if (!!(endRel & Relationship.ABOVE) &&\n        !(startRel & Relationship.ABOVE)) {\n      // potentially intersects top\n      x = endX - ((endY - maxY) / slope);\n      intersects = x >= minX && x <= maxX;\n    }\n    if (!intersects && !!(endRel & Relationship.RIGHT) &&\n        !(startRel & Relationship.RIGHT)) {\n      // potentially intersects right\n      y = endY - ((endX - maxX) * slope);\n      intersects = y >= minY && y <= maxY;\n    }\n    if (!intersects && !!(endRel & Relationship.BELOW) &&\n        !(startRel & Relationship.BELOW)) {\n      // potentially intersects bottom\n      x = endX - ((endY - minY) / slope);\n      intersects = x >= minX && x <= maxX;\n    }\n    if (!intersects && !!(endRel & Relationship.LEFT) &&\n        !(startRel & Relationship.LEFT)) {\n      // potentially intersects left\n      y = endY - ((endX - minX) * slope);\n      intersects = y >= minY && y <= maxY;\n    }\n\n  }\n  return intersects;\n}\n\n\n/**\n * Apply a transform function to the extent.\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {module:ol/proj~TransformFunction} transformFn Transform function.\n * Called with `[minX, minY, maxX, maxY]` extent coordinates.\n * @param {module:ol/extent~Extent=} opt_extent Destination extent.\n * @return {module:ol/extent~Extent} Extent.\n * @api\n */\nexport function applyTransform(extent, transformFn, opt_extent) {\n  const coordinates = [\n    extent[0], extent[1],\n    extent[0], extent[3],\n    extent[2], extent[1],\n    extent[2], extent[3]\n  ];\n  transformFn(coordinates, coordinates, 2);\n  const xs = [coordinates[0], coordinates[2], coordinates[4], coordinates[6]];\n  const ys = [coordinates[1], coordinates[3], coordinates[5], coordinates[7]];\n  return _boundingExtentXYs(xs, ys, opt_extent);\n}\n","/**\n * @module ol/events\n */\nimport {clear} from './obj.js';\n\n\n/**\n * Key to use with {@link module:ol/Observable~Observable#unByKey}.\n * @typedef {Object} EventsKey\n * @property {Object} [bindTo]\n * @property {module:ol/events~ListenerFunction} [boundListener]\n * @property {boolean} callOnce\n * @property {number} [deleteIndex]\n * @property {module:ol/events~ListenerFunction} listener\n * @property {module:ol/events/Target~EventTargetLike} target\n * @property {string} type\n * @api\n */\n\n\n/**\n * Listener function. This function is called with an event object as argument.\n * When the function returns `false`, event propagation will stop.\n *\n * @typedef {function(module:ol/events/Event)|function(module:ol/events/Event): boolean} ListenerFunction\n * @api\n */\n\n\n/**\n * @param {module:ol/events~EventsKey} listenerObj Listener object.\n * @return {module:ol/events~ListenerFunction} Bound listener.\n */\nexport function bindListener(listenerObj) {\n  const boundListener = function(evt) {\n    const listener = listenerObj.listener;\n    const bindTo = listenerObj.bindTo || listenerObj.target;\n    if (listenerObj.callOnce) {\n      unlistenByKey(listenerObj);\n    }\n    return listener.call(bindTo, evt);\n  };\n  listenerObj.boundListener = boundListener;\n  return boundListener;\n}\n\n\n/**\n * Finds the matching {@link module:ol/events~EventsKey} in the given listener\n * array.\n *\n * @param {!Array<!module:ol/events~EventsKey>} listeners Array of listeners.\n * @param {!Function} listener The listener function.\n * @param {Object=} opt_this The `this` value inside the listener.\n * @param {boolean=} opt_setDeleteIndex Set the deleteIndex on the matching\n *     listener, for {@link module:ol/events~unlistenByKey}.\n * @return {module:ol/events~EventsKey|undefined} The matching listener object.\n */\nexport function findListener(listeners, listener, opt_this, opt_setDeleteIndex) {\n  let listenerObj;\n  for (let i = 0, ii = listeners.length; i < ii; ++i) {\n    listenerObj = listeners[i];\n    if (listenerObj.listener === listener &&\n        listenerObj.bindTo === opt_this) {\n      if (opt_setDeleteIndex) {\n        listenerObj.deleteIndex = i;\n      }\n      return listenerObj;\n    }\n  }\n  return undefined;\n}\n\n\n/**\n * @param {module:ol/events/Target~EventTargetLike} target Target.\n * @param {string} type Type.\n * @return {Array<module:ol/events~EventsKey>|undefined} Listeners.\n */\nexport function getListeners(target, type) {\n  const listenerMap = target.ol_lm;\n  return listenerMap ? listenerMap[type] : undefined;\n}\n\n\n/**\n * Get the lookup of listeners.  If one does not exist on the target, it is\n * created.\n * @param {module:ol/events/Target~EventTargetLike} target Target.\n * @return {!Object<string, Array<module:ol/events~EventsKey>>} Map of\n *     listeners by event type.\n */\nfunction getListenerMap(target) {\n  let listenerMap = target.ol_lm;\n  if (!listenerMap) {\n    listenerMap = target.ol_lm = {};\n  }\n  return listenerMap;\n}\n\n\n/**\n * Clean up all listener objects of the given type.  All properties on the\n * listener objects will be removed, and if no listeners remain in the listener\n * map, it will be removed from the target.\n * @param {module:ol/events/Target~EventTargetLike} target Target.\n * @param {string} type Type.\n */\nfunction removeListeners(target, type) {\n  const listeners = getListeners(target, type);\n  if (listeners) {\n    for (let i = 0, ii = listeners.length; i < ii; ++i) {\n      target.removeEventListener(type, listeners[i].boundListener);\n      clear(listeners[i]);\n    }\n    listeners.length = 0;\n    const listenerMap = target.ol_lm;\n    if (listenerMap) {\n      delete listenerMap[type];\n      if (Object.keys(listenerMap).length === 0) {\n        delete target.ol_lm;\n      }\n    }\n  }\n}\n\n\n/**\n * Registers an event listener on an event target. Inspired by\n * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html\n *\n * This function efficiently binds a `listener` to a `this` object, and returns\n * a key for use with {@link module:ol/events~unlistenByKey}.\n *\n * @param {module:ol/events/Target~EventTargetLike} target Event target.\n * @param {string} type Event type.\n * @param {module:ol/events~ListenerFunction} listener Listener.\n * @param {Object=} opt_this Object referenced by the `this` keyword in the\n *     listener. Default is the `target`.\n * @param {boolean=} opt_once If true, add the listener as one-off listener.\n * @return {module:ol/events~EventsKey} Unique key for the listener.\n */\nexport function listen(target, type, listener, opt_this, opt_once) {\n  const listenerMap = getListenerMap(target);\n  let listeners = listenerMap[type];\n  if (!listeners) {\n    listeners = listenerMap[type] = [];\n  }\n  let listenerObj = findListener(listeners, listener, opt_this, false);\n  if (listenerObj) {\n    if (!opt_once) {\n      // Turn one-off listener into a permanent one.\n      listenerObj.callOnce = false;\n    }\n  } else {\n    listenerObj = /** @type {module:ol/events~EventsKey} */ ({\n      bindTo: opt_this,\n      callOnce: !!opt_once,\n      listener: listener,\n      target: target,\n      type: type\n    });\n    target.addEventListener(type, bindListener(listenerObj));\n    listeners.push(listenerObj);\n  }\n\n  return listenerObj;\n}\n\n\n/**\n * Registers a one-off event listener on an event target. Inspired by\n * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html\n *\n * This function efficiently binds a `listener` as self-unregistering listener\n * to a `this` object, and returns a key for use with\n * {@link module:ol/events~unlistenByKey} in case the listener needs to be\n * unregistered before it is called.\n *\n * When {@link module:ol/events~listen} is called with the same arguments after this\n * function, the self-unregistering listener will be turned into a permanent\n * listener.\n *\n * @param {module:ol/events/Target~EventTargetLike} target Event target.\n * @param {string} type Event type.\n * @param {module:ol/events~ListenerFunction} listener Listener.\n * @param {Object=} opt_this Object referenced by the `this` keyword in the\n *     listener. Default is the `target`.\n * @return {module:ol/events~EventsKey} Key for unlistenByKey.\n */\nexport function listenOnce(target, type, listener, opt_this) {\n  return listen(target, type, listener, opt_this, true);\n}\n\n\n/**\n * Unregisters an event listener on an event target. Inspired by\n * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html\n *\n * To return a listener, this function needs to be called with the exact same\n * arguments that were used for a previous {@link module:ol/events~listen} call.\n *\n * @param {module:ol/events/Target~EventTargetLike} target Event target.\n * @param {string} type Event type.\n * @param {module:ol/events~ListenerFunction} listener Listener.\n * @param {Object=} opt_this Object referenced by the `this` keyword in the\n *     listener. Default is the `target`.\n */\nexport function unlisten(target, type, listener, opt_this) {\n  const listeners = getListeners(target, type);\n  if (listeners) {\n    const listenerObj = findListener(listeners, listener, opt_this, true);\n    if (listenerObj) {\n      unlistenByKey(listenerObj);\n    }\n  }\n}\n\n\n/**\n * Unregisters event listeners on an event target. Inspired by\n * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html\n *\n * The argument passed to this function is the key returned from\n * {@link module:ol/events~listen} or {@link module:ol/events~listenOnce}.\n *\n * @param {module:ol/events~EventsKey} key The key.\n */\nexport function unlistenByKey(key) {\n  if (key && key.target) {\n    key.target.removeEventListener(key.type, key.boundListener);\n    const listeners = getListeners(key.target, key.type);\n    if (listeners) {\n      const i = 'deleteIndex' in key ? key.deleteIndex : listeners.indexOf(key);\n      if (i !== -1) {\n        listeners.splice(i, 1);\n      }\n      if (listeners.length === 0) {\n        removeListeners(key.target, key.type);\n      }\n    }\n    clear(key);\n  }\n}\n\n\n/**\n * Unregisters all event listeners on an event target. Inspired by\n * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html\n *\n * @param {module:ol/events/Target~EventTargetLike} target Target.\n */\nexport function unlistenAll(target) {\n  const listenerMap = getListenerMap(target);\n  for (const type in listenerMap) {\n    removeListeners(target, type);\n  }\n}\n","/**\n * @module ol/geom/GeometryType\n */\n\n/**\n * The geometry type. One of `'Point'`, `'LineString'`, `'LinearRing'`,\n * `'Polygon'`, `'MultiPoint'`, `'MultiLineString'`, `'MultiPolygon'`,\n * `'GeometryCollection'`, `'Circle'`.\n * @enum {string}\n */\nexport default {\n  POINT: 'Point',\n  LINE_STRING: 'LineString',\n  LINEAR_RING: 'LinearRing',\n  POLYGON: 'Polygon',\n  MULTI_POINT: 'MultiPoint',\n  MULTI_LINE_STRING: 'MultiLineString',\n  MULTI_POLYGON: 'MultiPolygon',\n  GEOMETRY_COLLECTION: 'GeometryCollection',\n  CIRCLE: 'Circle'\n};\n","/**\n * @module ol/TileState\n */\n\n/**\n * @enum {number}\n */\nexport default {\n  IDLE: 0,\n  LOADING: 1,\n  LOADED: 2,\n  /**\n   * Indicates that tile loading failed\n   * @type {number}\n   * @api\n   */\n  ERROR: 3,\n  EMPTY: 4,\n  ABORT: 5\n};\n","/**\n * @module ol/events/EventType\n */\n\n/**\n * @enum {string}\n * @const\n */\nexport default {\n  /**\n   * Generic change event. Triggered when the revision counter is increased.\n   * @event module:ol/events/Event~Event#change\n   * @api\n   */\n  CHANGE: 'change',\n\n  CLEAR: 'clear',\n  CONTEXTMENU: 'contextmenu',\n  CLICK: 'click',\n  DBLCLICK: 'dblclick',\n  DRAGENTER: 'dragenter',\n  DRAGOVER: 'dragover',\n  DROP: 'drop',\n  ERROR: 'error',\n  KEYDOWN: 'keydown',\n  KEYPRESS: 'keypress',\n  LOAD: 'load',\n  MOUSEDOWN: 'mousedown',\n  MOUSEMOVE: 'mousemove',\n  MOUSEOUT: 'mouseout',\n  MOUSEUP: 'mouseup',\n  MOUSEWHEEL: 'mousewheel',\n  MSPOINTERDOWN: 'MSPointerDown',\n  RESIZE: 'resize',\n  TOUCHSTART: 'touchstart',\n  TOUCHMOVE: 'touchmove',\n  TOUCHEND: 'touchend',\n  WHEEL: 'wheel'\n};\n","/**\n * @module ol/render/canvas\n */\nimport {getFontFamilies} from '../css.js';\nimport {createCanvasContext2D} from '../dom.js';\nimport {clear} from '../obj.js';\nimport LRUCache from '../structs/LRUCache.js';\nimport {create as createTransform} from '../transform.js';\n\n\n/**\n * @typedef {Object} FillState\n * @property {module:ol/colorlike~ColorLike} fillStyle\n */\n\n\n/**\n * @typedef {Object} FillStrokeState\n * @property {module:ol/colorlike~ColorLike} [currentFillStyle]\n * @property {module:ol/colorlike~ColorLike} [currentStrokeStyle]\n * @property {string} [currentLineCap]\n * @property {Array<number>} currentLineDash\n * @property {number} [currentLineDashOffset]\n * @property {string} [currentLineJoin]\n * @property {number} [currentLineWidth]\n * @property {number} [currentMiterLimit]\n * @property {number} [lastStroke]\n * @property {module:ol/colorlike~ColorLike} [fillStyle]\n * @property {module:ol/colorlike~ColorLike} [strokeStyle]\n * @property {string} [lineCap]\n * @property {Array<number>} lineDash\n * @property {number} [lineDashOffset]\n * @property {string} [lineJoin]\n * @property {number} [lineWidth]\n * @property {number} [miterLimit]\n */\n\n\n/**\n * @typedef {Object} StrokeState\n * @property {string} lineCap\n * @property {Array<number>} lineDash\n * @property {number} lineDashOffset\n * @property {string} lineJoin\n * @property {number} lineWidth\n * @property {number} miterLimit\n * @property {module:ol/colorlike~ColorLike} strokeStyle\n */\n\n\n/**\n * @typedef {Object} TextState\n * @property {string} font\n * @property {string} [textAlign]\n * @property {string} textBaseline\n */\n\n\n/**\n * Container for decluttered replay instructions that need to be rendered or\n * omitted together, i.e. when styles render both an image and text, or for the\n * characters that form text along lines. The basic elements of this array are\n * `[minX, minY, maxX, maxY, count]`, where the first four entries are the\n * rendered extent of the group in pixel space. `count` is the number of styles\n * in the group, i.e. 2 when an image and a text are grouped, or 1 otherwise.\n * In addition to these four elements, declutter instruction arrays (i.e. the\n * arguments to {@link module:ol/render/canvas~drawImage} are appended to the array.\n * @typedef {Array<*>} DeclutterGroup\n */\n\n\n/**\n * @const\n * @type {string}\n */\nexport const defaultFont = '10px sans-serif';\n\n\n/**\n * @const\n * @type {module:ol/color~Color}\n */\nexport const defaultFillStyle = [0, 0, 0, 1];\n\n\n/**\n * @const\n * @type {string}\n */\nexport const defaultLineCap = 'round';\n\n\n/**\n * @const\n * @type {Array<number>}\n */\nexport const defaultLineDash = [];\n\n\n/**\n * @const\n * @type {number}\n */\nexport const defaultLineDashOffset = 0;\n\n\n/**\n * @const\n * @type {string}\n */\nexport const defaultLineJoin = 'round';\n\n\n/**\n * @const\n * @type {number}\n */\nexport const defaultMiterLimit = 10;\n\n\n/**\n * @const\n * @type {module:ol/color~Color}\n */\nexport const defaultStrokeStyle = [0, 0, 0, 1];\n\n\n/**\n * @const\n * @type {string}\n */\nexport const defaultTextAlign = 'center';\n\n\n/**\n * @const\n * @type {string}\n */\nexport const defaultTextBaseline = 'middle';\n\n\n/**\n * @const\n * @type {Array<number>}\n */\nexport const defaultPadding = [0, 0, 0, 0];\n\n\n/**\n * @const\n * @type {number}\n */\nexport const defaultLineWidth = 1;\n\n\n/**\n * The label cache for text rendering. To change the default cache size of 2048\n * entries, use {@link module:ol/structs/LRUCache#setSize}.\n * @type {module:ol/structs/LRUCache<HTMLCanvasElement>}\n * @api\n */\nexport const labelCache = new LRUCache();\n\n\n/**\n * @type {!Object<string, number>}\n */\nexport const checkedFonts = {};\n\n\n/**\n * @type {CanvasRenderingContext2D}\n */\nlet measureContext = null;\n\n\n/**\n * @type {!Object<string, number>}\n */\nexport const textHeights = {};\n\n\n/**\n * Clears the label cache when a font becomes available.\n * @param {string} fontSpec CSS font spec.\n */\nexport const checkFont = (function() {\n  const retries = 60;\n  const checked = checkedFonts;\n  const size = '32px ';\n  const referenceFonts = ['monospace', 'serif'];\n  const len = referenceFonts.length;\n  const text = 'wmytzilWMYTZIL@#/&?$%10\\uF013';\n  let interval, referenceWidth;\n\n  function isAvailable(font) {\n    const context = getMeasureContext();\n    // Check weight ranges according to\n    // https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight#Fallback_weights\n    for (let weight = 100; weight <= 700; weight += 300) {\n      const fontWeight = weight + ' ';\n      let available = true;\n      for (let i = 0; i < len; ++i) {\n        const referenceFont = referenceFonts[i];\n        context.font = fontWeight + size + referenceFont;\n        referenceWidth = context.measureText(text).width;\n        if (font != referenceFont) {\n          context.font = fontWeight + size + font + ',' + referenceFont;\n          const width = context.measureText(text).width;\n          // If width and referenceWidth are the same, then the fallback was used\n          // instead of the font we wanted, so the font is not available.\n          available = available && width != referenceWidth;\n        }\n      }\n      if (available) {\n        // Consider font available when it is available in one weight range.\n        //FIXME With this we miss rare corner cases, so we should consider\n        //FIXME checking availability for each requested weight range.\n        return true;\n      }\n    }\n    return false;\n  }\n\n  function check() {\n    let done = true;\n    for (const font in checked) {\n      if (checked[font] < retries) {\n        if (isAvailable(font)) {\n          checked[font] = retries;\n          clear(textHeights);\n          // Make sure that loaded fonts are picked up by Safari\n          measureContext = null;\n          labelCache.clear();\n        } else {\n          ++checked[font];\n          done = false;\n        }\n      }\n    }\n    if (done) {\n      clearInterval(interval);\n      interval = undefined;\n    }\n  }\n\n  return function(fontSpec) {\n    const fontFamilies = getFontFamilies(fontSpec);\n    if (!fontFamilies) {\n      return;\n    }\n    for (let i = 0, ii = fontFamilies.length; i < ii; ++i) {\n      const fontFamily = fontFamilies[i];\n      if (!(fontFamily in checked)) {\n        checked[fontFamily] = retries;\n        if (!isAvailable(fontFamily)) {\n          checked[fontFamily] = 0;\n          if (interval === undefined) {\n            interval = setInterval(check, 32);\n          }\n        }\n      }\n    }\n  };\n})();\n\n\n/**\n * @return {CanvasRenderingContext2D} Measure context.\n */\nfunction getMeasureContext() {\n  if (!measureContext) {\n    measureContext = createCanvasContext2D(1, 1);\n  }\n  return measureContext;\n}\n\n\n/**\n * @param {string} font Font to use for measuring.\n * @return {module:ol/size~Size} Measurement.\n */\nexport const measureTextHeight = (function() {\n  let span;\n  const heights = textHeights;\n  return function(font) {\n    let height = heights[font];\n    if (height == undefined) {\n      if (!span) {\n        span = document.createElement('span');\n        span.textContent = 'M';\n        span.style.margin = span.style.padding = '0 !important';\n        span.style.position = 'absolute !important';\n        span.style.left = '-99999px !important';\n      }\n      span.style.font = font;\n      document.body.appendChild(span);\n      height = heights[font] = span.offsetHeight;\n      document.body.removeChild(span);\n    }\n    return height;\n  };\n})();\n\n\n/**\n * @param {string} font Font.\n * @param {string} text Text.\n * @return {number} Width.\n */\nexport function measureTextWidth(font, text) {\n  const measureContext = getMeasureContext();\n  if (font != measureContext.font) {\n    measureContext.font = font;\n  }\n  return measureContext.measureText(text).width;\n}\n\n\n/**\n * @param {CanvasRenderingContext2D} context Context.\n * @param {number} rotation Rotation.\n * @param {number} offsetX X offset.\n * @param {number} offsetY Y offset.\n */\nexport function rotateAtOffset(context, rotation, offsetX, offsetY) {\n  if (rotation !== 0) {\n    context.translate(offsetX, offsetY);\n    context.rotate(rotation);\n    context.translate(-offsetX, -offsetY);\n  }\n}\n\n\nexport const resetTransform = createTransform();\n\n\n/**\n * @param {CanvasRenderingContext2D} context Context.\n * @param {module:ol/transform~Transform|null} transform Transform.\n * @param {number} opacity Opacity.\n * @param {HTMLImageElement|HTMLCanvasElement|HTMLVideoElement} image Image.\n * @param {number} originX Origin X.\n * @param {number} originY Origin Y.\n * @param {number} w Width.\n * @param {number} h Height.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {number} scale Scale.\n */\nexport function drawImage(context,\n  transform, opacity, image, originX, originY, w, h, x, y, scale) {\n  let alpha;\n  if (opacity != 1) {\n    alpha = context.globalAlpha;\n    context.globalAlpha = alpha * opacity;\n  }\n  if (transform) {\n    context.setTransform.apply(context, transform);\n  }\n\n  context.drawImage(image, originX, originY, w, h, x, y, w * scale, h * scale);\n\n  if (alpha) {\n    context.globalAlpha = alpha;\n  }\n  if (transform) {\n    context.setTransform.apply(context, resetTransform);\n  }\n}\n","/**\n * @module ol/util\n */\n\n/**\n * Inherit the prototype methods from one constructor into another.\n *\n * Usage:\n *\n *     function ParentClass(a, b) { }\n *     ParentClass.prototype.foo = function(a) { }\n *\n *     function ChildClass(a, b, c) {\n *       // Call parent constructor\n *       ParentClass.call(this, a, b);\n *     }\n *     inherits(ChildClass, ParentClass);\n *\n *     var child = new ChildClass('a', 'b', 'see');\n *     child.foo(); // This works.\n *\n * @param {!Function} childCtor Child constructor.\n * @param {!Function} parentCtor Parent constructor.\n * @function module:ol.inherits\n * @deprecated\n * @api\n */\nexport function inherits(childCtor, parentCtor) {\n  childCtor.prototype = Object.create(parentCtor.prototype);\n  childCtor.prototype.constructor = childCtor;\n}\n\n/**\n * Counter for getUid.\n * @type {number}\n * @private\n */\nlet uidCounter_ = 0;\n\n/**\n * Gets a unique ID for an object. This mutates the object so that further calls\n * with the same object as a parameter returns the same value. Unique IDs are generated\n * as a strictly increasing sequence. Adapted from goog.getUid.\n *\n * @param {Object} obj The object to get the unique ID for.\n * @return {number} The unique ID for the object.\n * @api\n */\nexport function getUid(obj) {\n  return obj.ol_uid || (obj.ol_uid = ++uidCounter_);\n}\n\n/**\n * OpenLayers version.\n * @type {string}\n */\nexport const VERSION = 'latest';\n","/**\n * @module ol/math\n */\nimport {assert} from './asserts.js';\n\n/**\n * Takes a number and clamps it to within the provided bounds.\n * @param {number} value The input number.\n * @param {number} min The minimum value to return.\n * @param {number} max The maximum value to return.\n * @return {number} The input number if it is within bounds, or the nearest\n *     number within the bounds.\n */\nexport function clamp(value, min, max) {\n  return Math.min(Math.max(value, min), max);\n}\n\n\n/**\n * Return the hyperbolic cosine of a given number. The method will use the\n * native `Math.cosh` function if it is available, otherwise the hyperbolic\n * cosine will be calculated via the reference implementation of the Mozilla\n * developer network.\n *\n * @param {number} x X.\n * @return {number} Hyperbolic cosine of x.\n */\nexport const cosh = (function() {\n  // Wrapped in a iife, to save the overhead of checking for the native\n  // implementation on every invocation.\n  let cosh;\n  if ('cosh' in Math) {\n    // The environment supports the native Math.cosh function, use it…\n    cosh = Math.cosh;\n  } else {\n    // … else, use the reference implementation of MDN:\n    cosh = function(x) {\n      const y = Math.exp(x);\n      return (y + 1 / y) / 2;\n    };\n  }\n  return cosh;\n}());\n\n\n/**\n * @param {number} x X.\n * @return {number} The smallest power of two greater than or equal to x.\n */\nexport function roundUpToPowerOfTwo(x) {\n  assert(0 < x, 29); // `x` must be greater than `0`\n  return Math.pow(2, Math.ceil(Math.log(x) / Math.LN2));\n}\n\n\n/**\n * Returns the square of the closest distance between the point (x, y) and the\n * line segment (x1, y1) to (x2, y2).\n * @param {number} x X.\n * @param {number} y Y.\n * @param {number} x1 X1.\n * @param {number} y1 Y1.\n * @param {number} x2 X2.\n * @param {number} y2 Y2.\n * @return {number} Squared distance.\n */\nexport function squaredSegmentDistance(x, y, x1, y1, x2, y2) {\n  const dx = x2 - x1;\n  const dy = y2 - y1;\n  if (dx !== 0 || dy !== 0) {\n    const t = ((x - x1) * dx + (y - y1) * dy) / (dx * dx + dy * dy);\n    if (t > 1) {\n      x1 = x2;\n      y1 = y2;\n    } else if (t > 0) {\n      x1 += dx * t;\n      y1 += dy * t;\n    }\n  }\n  return squaredDistance(x, y, x1, y1);\n}\n\n\n/**\n * Returns the square of the distance between the points (x1, y1) and (x2, y2).\n * @param {number} x1 X1.\n * @param {number} y1 Y1.\n * @param {number} x2 X2.\n * @param {number} y2 Y2.\n * @return {number} Squared distance.\n */\nexport function squaredDistance(x1, y1, x2, y2) {\n  const dx = x2 - x1;\n  const dy = y2 - y1;\n  return dx * dx + dy * dy;\n}\n\n\n/**\n * Solves system of linear equations using Gaussian elimination method.\n *\n * @param {Array<Array<number>>} mat Augmented matrix (n x n + 1 column)\n *                                     in row-major order.\n * @return {Array<number>} The resulting vector.\n */\nexport function solveLinearSystem(mat) {\n  const n = mat.length;\n\n  for (let i = 0; i < n; i++) {\n    // Find max in the i-th column (ignoring i - 1 first rows)\n    let maxRow = i;\n    let maxEl = Math.abs(mat[i][i]);\n    for (let r = i + 1; r < n; r++) {\n      const absValue = Math.abs(mat[r][i]);\n      if (absValue > maxEl) {\n        maxEl = absValue;\n        maxRow = r;\n      }\n    }\n\n    if (maxEl === 0) {\n      return null; // matrix is singular\n    }\n\n    // Swap max row with i-th (current) row\n    const tmp = mat[maxRow];\n    mat[maxRow] = mat[i];\n    mat[i] = tmp;\n\n    // Subtract the i-th row to make all the remaining rows 0 in the i-th column\n    for (let j = i + 1; j < n; j++) {\n      const coef = -mat[j][i] / mat[i][i];\n      for (let k = i; k < n + 1; k++) {\n        if (i == k) {\n          mat[j][k] = 0;\n        } else {\n          mat[j][k] += coef * mat[i][k];\n        }\n      }\n    }\n  }\n\n  // Solve Ax=b for upper triangular matrix A (mat)\n  const x = new Array(n);\n  for (let l = n - 1; l >= 0; l--) {\n    x[l] = mat[l][n] / mat[l][l];\n    for (let m = l - 1; m >= 0; m--) {\n      mat[m][n] -= mat[m][l] * x[l];\n    }\n  }\n  return x;\n}\n\n\n/**\n * Converts radians to to degrees.\n *\n * @param {number} angleInRadians Angle in radians.\n * @return {number} Angle in degrees.\n */\nexport function toDegrees(angleInRadians) {\n  return angleInRadians * 180 / Math.PI;\n}\n\n\n/**\n * Converts degrees to radians.\n *\n * @param {number} angleInDegrees Angle in degrees.\n * @return {number} Angle in radians.\n */\nexport function toRadians(angleInDegrees) {\n  return angleInDegrees * Math.PI / 180;\n}\n\n/**\n * Returns the modulo of a / b, depending on the sign of b.\n *\n * @param {number} a Dividend.\n * @param {number} b Divisor.\n * @return {number} Modulo.\n */\nexport function modulo(a, b) {\n  const r = a % b;\n  return r * b < 0 ? r + b : r;\n}\n\n/**\n * Calculates the linearly interpolated value of x between a and b.\n *\n * @param {number} a Number\n * @param {number} b Number\n * @param {number} x Value to be interpolated.\n * @return {number} Interpolated value.\n */\nexport function lerp(a, b, x) {\n  return a + x * (b - a);\n}\n","/**\n * @module ol/transform\n */\nimport {assert} from './asserts.js';\n\n\n/**\n * An array representing an affine 2d transformation for use with\n * {@link module:ol/transform} functions. The array has 6 elements.\n * @typedef {!Array<number>} Transform\n */\n\n\n/**\n * Collection of affine 2d transformation functions. The functions work on an\n * array of 6 elements. The element order is compatible with the [SVGMatrix\n * interface](https://developer.mozilla.org/en-US/docs/Web/API/SVGMatrix) and is\n * a subset (elements a to f) of a 3×3 matrix:\n * ```\n * [ a c e ]\n * [ b d f ]\n * [ 0 0 1 ]\n * ```\n */\n\n\n/**\n * @private\n * @type {module:ol/transform~Transform}\n */\nconst tmp_ = new Array(6);\n\n\n/**\n * Create an identity transform.\n * @return {!module:ol/transform~Transform} Identity transform.\n */\nexport function create() {\n  return [1, 0, 0, 1, 0, 0];\n}\n\n\n/**\n * Resets the given transform to an identity transform.\n * @param {!module:ol/transform~Transform} transform Transform.\n * @return {!module:ol/transform~Transform} Transform.\n */\nexport function reset(transform) {\n  return set(transform, 1, 0, 0, 1, 0, 0);\n}\n\n\n/**\n * Multiply the underlying matrices of two transforms and return the result in\n * the first transform.\n * @param {!module:ol/transform~Transform} transform1 Transform parameters of matrix 1.\n * @param {!module:ol/transform~Transform} transform2 Transform parameters of matrix 2.\n * @return {!module:ol/transform~Transform} transform1 multiplied with transform2.\n */\nexport function multiply(transform1, transform2) {\n  const a1 = transform1[0];\n  const b1 = transform1[1];\n  const c1 = transform1[2];\n  const d1 = transform1[3];\n  const e1 = transform1[4];\n  const f1 = transform1[5];\n  const a2 = transform2[0];\n  const b2 = transform2[1];\n  const c2 = transform2[2];\n  const d2 = transform2[3];\n  const e2 = transform2[4];\n  const f2 = transform2[5];\n\n  transform1[0] = a1 * a2 + c1 * b2;\n  transform1[1] = b1 * a2 + d1 * b2;\n  transform1[2] = a1 * c2 + c1 * d2;\n  transform1[3] = b1 * c2 + d1 * d2;\n  transform1[4] = a1 * e2 + c1 * f2 + e1;\n  transform1[5] = b1 * e2 + d1 * f2 + f1;\n\n  return transform1;\n}\n\n/**\n * Set the transform components a-f on a given transform.\n * @param {!module:ol/transform~Transform} transform Transform.\n * @param {number} a The a component of the transform.\n * @param {number} b The b component of the transform.\n * @param {number} c The c component of the transform.\n * @param {number} d The d component of the transform.\n * @param {number} e The e component of the transform.\n * @param {number} f The f component of the transform.\n * @return {!module:ol/transform~Transform} Matrix with transform applied.\n */\nexport function set(transform, a, b, c, d, e, f) {\n  transform[0] = a;\n  transform[1] = b;\n  transform[2] = c;\n  transform[3] = d;\n  transform[4] = e;\n  transform[5] = f;\n  return transform;\n}\n\n\n/**\n * Set transform on one matrix from another matrix.\n * @param {!module:ol/transform~Transform} transform1 Matrix to set transform to.\n * @param {!module:ol/transform~Transform} transform2 Matrix to set transform from.\n * @return {!module:ol/transform~Transform} transform1 with transform from transform2 applied.\n */\nexport function setFromArray(transform1, transform2) {\n  transform1[0] = transform2[0];\n  transform1[1] = transform2[1];\n  transform1[2] = transform2[2];\n  transform1[3] = transform2[3];\n  transform1[4] = transform2[4];\n  transform1[5] = transform2[5];\n  return transform1;\n}\n\n\n/**\n * Transforms the given coordinate with the given transform returning the\n * resulting, transformed coordinate. The coordinate will be modified in-place.\n *\n * @param {module:ol/transform~Transform} transform The transformation.\n * @param {module:ol/coordinate~Coordinate|module:ol/pixel~Pixel} coordinate The coordinate to transform.\n * @return {module:ol/coordinate~Coordinate|module:ol/pixel~Pixel} return coordinate so that operations can be\n *     chained together.\n */\nexport function apply(transform, coordinate) {\n  const x = coordinate[0];\n  const y = coordinate[1];\n  coordinate[0] = transform[0] * x + transform[2] * y + transform[4];\n  coordinate[1] = transform[1] * x + transform[3] * y + transform[5];\n  return coordinate;\n}\n\n\n/**\n * Applies rotation to the given transform.\n * @param {!module:ol/transform~Transform} transform Transform.\n * @param {number} angle Angle in radians.\n * @return {!module:ol/transform~Transform} The rotated transform.\n */\nexport function rotate(transform, angle) {\n  const cos = Math.cos(angle);\n  const sin = Math.sin(angle);\n  return multiply(transform, set(tmp_, cos, sin, -sin, cos, 0, 0));\n}\n\n\n/**\n * Applies scale to a given transform.\n * @param {!module:ol/transform~Transform} transform Transform.\n * @param {number} x Scale factor x.\n * @param {number} y Scale factor y.\n * @return {!module:ol/transform~Transform} The scaled transform.\n */\nexport function scale(transform, x, y) {\n  return multiply(transform, set(tmp_, x, 0, 0, y, 0, 0));\n}\n\n\n/**\n * Applies translation to the given transform.\n * @param {!module:ol/transform~Transform} transform Transform.\n * @param {number} dx Translation x.\n * @param {number} dy Translation y.\n * @return {!module:ol/transform~Transform} The translated transform.\n */\nexport function translate(transform, dx, dy) {\n  return multiply(transform, set(tmp_, 1, 0, 0, 1, dx, dy));\n}\n\n\n/**\n * Creates a composite transform given an initial translation, scale, rotation, and\n * final translation (in that order only, not commutative).\n * @param {!module:ol/transform~Transform} transform The transform (will be modified in place).\n * @param {number} dx1 Initial translation x.\n * @param {number} dy1 Initial translation y.\n * @param {number} sx Scale factor x.\n * @param {number} sy Scale factor y.\n * @param {number} angle Rotation (in counter-clockwise radians).\n * @param {number} dx2 Final translation x.\n * @param {number} dy2 Final translation y.\n * @return {!module:ol/transform~Transform} The composite transform.\n */\nexport function compose(transform, dx1, dy1, sx, sy, angle, dx2, dy2) {\n  const sin = Math.sin(angle);\n  const cos = Math.cos(angle);\n  transform[0] = sx * cos;\n  transform[1] = sy * sin;\n  transform[2] = -sx * sin;\n  transform[3] = sy * cos;\n  transform[4] = dx2 * sx * cos - dy2 * sx * sin + dx1;\n  transform[5] = dx2 * sy * sin + dy2 * sy * cos + dy1;\n  return transform;\n}\n\n\n/**\n * Invert the given transform.\n * @param {!module:ol/transform~Transform} transform Transform.\n * @return {!module:ol/transform~Transform} Inverse of the transform.\n */\nexport function invert(transform) {\n  const det = determinant(transform);\n  assert(det !== 0, 32); // Transformation matrix cannot be inverted\n\n  const a = transform[0];\n  const b = transform[1];\n  const c = transform[2];\n  const d = transform[3];\n  const e = transform[4];\n  const f = transform[5];\n\n  transform[0] = d / det;\n  transform[1] = -b / det;\n  transform[2] = -c / det;\n  transform[3] = a / det;\n  transform[4] = (c * f - d * e) / det;\n  transform[5] = -(a * f - b * e) / det;\n\n  return transform;\n}\n\n\n/**\n * Returns the determinant of the given matrix.\n * @param {!module:ol/transform~Transform} mat Matrix.\n * @return {number} Determinant.\n */\nexport function determinant(mat) {\n  return mat[0] * mat[3] - mat[1] * mat[2];\n}\n","/**\n * @module ol/functions\n */\n\n/**\n * Always returns true.\n * @returns {boolean} true.\n */\nexport function TRUE() {\n  return true;\n}\n\n/**\n * Always returns false.\n * @returns {boolean} false.\n */\nexport function FALSE() {\n  return false;\n}\n\n/**\n * A reusable function, used e.g. as a default for callbacks.\n *\n * @return {void} Nothing.\n */\nexport function VOID() {}\n","/**\n * @module ol/obj\n */\n\n\n/**\n * Polyfill for Object.assign().  Assigns enumerable and own properties from\n * one or more source objects to a target object.\n * See https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/assign.\n *\n * @param {!Object} target The target object.\n * @param {...Object} var_sources The source object(s).\n * @return {!Object} The modified target object.\n */\nexport const assign = (typeof Object.assign === 'function') ? Object.assign : function(target, var_sources) {\n  if (target === undefined || target === null) {\n    throw new TypeError('Cannot convert undefined or null to object');\n  }\n\n  const output = Object(target);\n  for (let i = 1, ii = arguments.length; i < ii; ++i) {\n    const source = arguments[i];\n    if (source !== undefined && source !== null) {\n      for (const key in source) {\n        if (source.hasOwnProperty(key)) {\n          output[key] = source[key];\n        }\n      }\n    }\n  }\n  return output;\n};\n\n\n/**\n * Removes all properties from an object.\n * @param {Object} object The object to clear.\n */\nexport function clear(object) {\n  for (const property in object) {\n    delete object[property];\n  }\n}\n\n\n/**\n * Get an array of property values from an object.\n * @param {Object<K,V>} object The object from which to get the values.\n * @return {!Array<V>} The property values.\n * @template K,V\n */\nexport function getValues(object) {\n  const values = [];\n  for (const property in object) {\n    values.push(object[property]);\n  }\n  return values;\n}\n\n\n/**\n * Determine if an object has any properties.\n * @param {Object} object The object to check.\n * @return {boolean} The object is empty.\n */\nexport function isEmpty(object) {\n  let property;\n  for (property in object) {\n    return false;\n  }\n  return !property;\n}\n","/**\n * @module ol/asserts\n */\nimport AssertionError from './AssertionError.js';\n\n/**\n * @param {*} assertion Assertion we expected to be truthy.\n * @param {number} errorCode Error code.\n */\nexport function assert(assertion, errorCode) {\n  if (!assertion) {\n    throw new AssertionError(errorCode);\n  }\n}\n","/**\n * @module ol/array\n */\n\n\n/**\n * Performs a binary search on the provided sorted list and returns the index of the item if found. If it can't be found it'll return -1.\n * https://github.com/darkskyapp/binary-search\n *\n * @param {Array<*>} haystack Items to search through.\n * @param {*} needle The item to look for.\n * @param {Function=} opt_comparator Comparator function.\n * @return {number} The index of the item if found, -1 if not.\n */\nexport function binarySearch(haystack, needle, opt_comparator) {\n  let mid, cmp;\n  const comparator = opt_comparator || numberSafeCompareFunction;\n  let low = 0;\n  let high = haystack.length;\n  let found = false;\n\n  while (low < high) {\n    /* Note that \"(low + high) >>> 1\" may overflow, and results in a typecast\n     * to double (which gives the wrong results). */\n    mid = low + (high - low >> 1);\n    cmp = +comparator(haystack[mid], needle);\n\n    if (cmp < 0.0) { /* Too low. */\n      low = mid + 1;\n\n    } else { /* Key found or too high */\n      high = mid;\n      found = !cmp;\n    }\n  }\n\n  /* Key not found. */\n  return found ? low : ~low;\n}\n\n\n/**\n * Compare function for array sort that is safe for numbers.\n * @param {*} a The first object to be compared.\n * @param {*} b The second object to be compared.\n * @return {number} A negative number, zero, or a positive number as the first\n *     argument is less than, equal to, or greater than the second.\n */\nexport function numberSafeCompareFunction(a, b) {\n  return a > b ? 1 : a < b ? -1 : 0;\n}\n\n\n/**\n * Whether the array contains the given object.\n * @param {Array<*>} arr The array to test for the presence of the element.\n * @param {*} obj The object for which to test.\n * @return {boolean} The object is in the array.\n */\nexport function includes(arr, obj) {\n  return arr.indexOf(obj) >= 0;\n}\n\n\n/**\n * @param {Array<number>} arr Array.\n * @param {number} target Target.\n * @param {number} direction 0 means return the nearest, > 0\n *    means return the largest nearest, < 0 means return the\n *    smallest nearest.\n * @return {number} Index.\n */\nexport function linearFindNearest(arr, target, direction) {\n  const n = arr.length;\n  if (arr[0] <= target) {\n    return 0;\n  } else if (target <= arr[n - 1]) {\n    return n - 1;\n  } else {\n    let i;\n    if (direction > 0) {\n      for (i = 1; i < n; ++i) {\n        if (arr[i] < target) {\n          return i - 1;\n        }\n      }\n    } else if (direction < 0) {\n      for (i = 1; i < n; ++i) {\n        if (arr[i] <= target) {\n          return i;\n        }\n      }\n    } else {\n      for (i = 1; i < n; ++i) {\n        if (arr[i] == target) {\n          return i;\n        } else if (arr[i] < target) {\n          if (arr[i - 1] - target < target - arr[i]) {\n            return i - 1;\n          } else {\n            return i;\n          }\n        }\n      }\n    }\n    return n - 1;\n  }\n}\n\n\n/**\n * @param {Array<*>} arr Array.\n * @param {number} begin Begin index.\n * @param {number} end End index.\n */\nexport function reverseSubArray(arr, begin, end) {\n  while (begin < end) {\n    const tmp = arr[begin];\n    arr[begin] = arr[end];\n    arr[end] = tmp;\n    ++begin;\n    --end;\n  }\n}\n\n\n/**\n * @param {Array<VALUE>} arr The array to modify.\n * @param {!Array<VALUE>|VALUE} data The elements or arrays of elements to add to arr.\n * @template VALUE\n */\nexport function extend(arr, data) {\n  const extension = Array.isArray(data) ? data : [data];\n  const length = extension.length;\n  for (let i = 0; i < length; i++) {\n    arr[arr.length] = extension[i];\n  }\n}\n\n\n/**\n * @param {Array<VALUE>} arr The array to modify.\n * @param {VALUE} obj The element to remove.\n * @template VALUE\n * @return {boolean} If the element was removed.\n */\nexport function remove(arr, obj) {\n  const i = arr.indexOf(obj);\n  const found = i > -1;\n  if (found) {\n    arr.splice(i, 1);\n  }\n  return found;\n}\n\n\n/**\n * @param {Array<VALUE>} arr The array to search in.\n * @param {function(VALUE, number, ?) : boolean} func The function to compare.\n * @template VALUE\n * @return {VALUE|null} The element found or null.\n */\nexport function find(arr, func) {\n  const length = arr.length >>> 0;\n  let value;\n\n  for (let i = 0; i < length; i++) {\n    value = arr[i];\n    if (func(value, i, arr)) {\n      return value;\n    }\n  }\n  return null;\n}\n\n\n/**\n * @param {Array|Uint8ClampedArray} arr1 The first array to compare.\n * @param {Array|Uint8ClampedArray} arr2 The second array to compare.\n * @return {boolean} Whether the two arrays are equal.\n */\nexport function equals(arr1, arr2) {\n  const len1 = arr1.length;\n  if (len1 !== arr2.length) {\n    return false;\n  }\n  for (let i = 0; i < len1; i++) {\n    if (arr1[i] !== arr2[i]) {\n      return false;\n    }\n  }\n  return true;\n}\n\n\n/**\n * Sort the passed array such that the relative order of equal elements is preverved.\n * See https://en.wikipedia.org/wiki/Sorting_algorithm#Stability for details.\n * @param {Array<*>} arr The array to sort (modifies original).\n * @param {!function(*, *): number} compareFnc Comparison function.\n * @api\n */\nexport function stableSort(arr, compareFnc) {\n  const length = arr.length;\n  const tmp = Array(arr.length);\n  let i;\n  for (i = 0; i < length; i++) {\n    tmp[i] = {index: i, value: arr[i]};\n  }\n  tmp.sort(function(a, b) {\n    return compareFnc(a.value, b.value) || a.index - b.index;\n  });\n  for (i = 0; i < arr.length; i++) {\n    arr[i] = tmp[i].value;\n  }\n}\n\n\n/**\n * @param {Array<*>} arr The array to search in.\n * @param {Function} func Comparison function.\n * @return {number} Return index.\n */\nexport function findIndex(arr, func) {\n  let index;\n  const found = !arr.every(function(el, idx) {\n    index = idx;\n    return !func(el, idx, arr);\n  });\n  return found ? index : -1;\n}\n\n\n/**\n * @param {Array<*>} arr The array to test.\n * @param {Function=} opt_func Comparison function.\n * @param {boolean=} opt_strict Strictly sorted (default false).\n * @return {boolean} Return index.\n */\nexport function isSorted(arr, opt_func, opt_strict) {\n  const compare = opt_func || numberSafeCompareFunction;\n  return arr.every(function(currentVal, index) {\n    if (index === 0) {\n      return true;\n    }\n    const res = compare(arr[index - 1], currentVal);\n    return !(res > 0 || opt_strict && res === 0);\n  });\n}\n","/**\n * @module ol/proj/epsg3857\n */\nimport {cosh} from '../math.js';\nimport Projection from '../proj/Projection.js';\nimport Units from '../proj/Units.js';\n\n\n/**\n * Radius of WGS84 sphere\n *\n * @const\n * @type {number}\n */\nexport const RADIUS = 6378137;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const HALF_SIZE = Math.PI * RADIUS;\n\n\n/**\n * @const\n * @type {module:ol/extent~Extent}\n */\nexport const EXTENT = [\n  -HALF_SIZE, -HALF_SIZE,\n  HALF_SIZE, HALF_SIZE\n];\n\n\n/**\n * @const\n * @type {module:ol/extent~Extent}\n */\nexport const WORLD_EXTENT = [-180, -85, 180, 85];\n\n\n/**\n * @classdesc\n * Projection object for web/spherical Mercator (EPSG:3857).\n */\nclass EPSG3857Projection extends Projection {\n\n  /**\n   * @param {string} code Code.\n   */\n  constructor(code) {\n    super({\n      code: code,\n      units: Units.METERS,\n      extent: EXTENT,\n      global: true,\n      worldExtent: WORLD_EXTENT,\n      getPointResolution: function(resolution, point) {\n        return resolution / cosh(point[1] / RADIUS);\n      }\n    });\n\n  }\n\n}\n\n\n/**\n * Projections equal to EPSG:3857.\n *\n * @const\n * @type {Array<module:ol/proj/Projection>}\n */\nexport const PROJECTIONS = [\n  new EPSG3857Projection('EPSG:3857'),\n  new EPSG3857Projection('EPSG:102100'),\n  new EPSG3857Projection('EPSG:102113'),\n  new EPSG3857Projection('EPSG:900913'),\n  new EPSG3857Projection('urn:ogc:def:crs:EPSG:6.18:3:3857'),\n  new EPSG3857Projection('urn:ogc:def:crs:EPSG::3857'),\n  new EPSG3857Projection('http://www.opengis.net/gml/srs/epsg.xml#3857')\n];\n\n\n/**\n * Transformation from EPSG:4326 to EPSG:3857.\n *\n * @param {Array<number>} input Input array of coordinate values.\n * @param {Array<number>=} opt_output Output array of coordinate values.\n * @param {number=} opt_dimension Dimension (default is `2`).\n * @return {Array<number>} Output array of coordinate values.\n */\nexport function fromEPSG4326(input, opt_output, opt_dimension) {\n  const length = input.length;\n  const dimension = opt_dimension > 1 ? opt_dimension : 2;\n  let output = opt_output;\n  if (output === undefined) {\n    if (dimension > 2) {\n      // preserve values beyond second dimension\n      output = input.slice();\n    } else {\n      output = new Array(length);\n    }\n  }\n  const halfSize = HALF_SIZE;\n  for (let i = 0; i < length; i += dimension) {\n    output[i] = halfSize * input[i] / 180;\n    let y = RADIUS *\n        Math.log(Math.tan(Math.PI * (input[i + 1] + 90) / 360));\n    if (y > halfSize) {\n      y = halfSize;\n    } else if (y < -halfSize) {\n      y = -halfSize;\n    }\n    output[i + 1] = y;\n  }\n  return output;\n}\n\n\n/**\n * Transformation from EPSG:3857 to EPSG:4326.\n *\n * @param {Array<number>} input Input array of coordinate values.\n * @param {Array<number>=} opt_output Output array of coordinate values.\n * @param {number=} opt_dimension Dimension (default is `2`).\n * @return {Array<number>} Output array of coordinate values.\n */\nexport function toEPSG4326(input, opt_output, opt_dimension) {\n  const length = input.length;\n  const dimension = opt_dimension > 1 ? opt_dimension : 2;\n  let output = opt_output;\n  if (output === undefined) {\n    if (dimension > 2) {\n      // preserve values beyond second dimension\n      output = input.slice();\n    } else {\n      output = new Array(length);\n    }\n  }\n  for (let i = 0; i < length; i += dimension) {\n    output[i] = 180 * input[i] / HALF_SIZE;\n    output[i + 1] = 360 * Math.atan(\n      Math.exp(input[i + 1] / RADIUS)) / Math.PI - 90;\n  }\n  return output;\n}\n","/**\n * @module ol/proj/epsg4326\n */\nimport Projection from '../proj/Projection.js';\nimport Units from '../proj/Units.js';\n\n\n/**\n * Semi-major radius of the WGS84 ellipsoid.\n *\n * @const\n * @type {number}\n */\nexport const RADIUS = 6378137;\n\n\n/**\n * Extent of the EPSG:4326 projection which is the whole world.\n *\n * @const\n * @type {module:ol/extent~Extent}\n */\nexport const EXTENT = [-180, -90, 180, 90];\n\n\n/**\n * @const\n * @type {number}\n */\nexport const METERS_PER_UNIT = Math.PI * RADIUS / 180;\n\n\n/**\n * @classdesc\n * Projection object for WGS84 geographic coordinates (EPSG:4326).\n *\n * Note that OpenLayers does not strictly comply with the EPSG definition.\n * The EPSG registry defines 4326 as a CRS for Latitude,Longitude (y,x).\n * OpenLayers treats EPSG:4326 as a pseudo-projection, with x,y coordinates.\n */\nclass EPSG4326Projection extends Projection {\n\n  /**\n   * @param {string} code Code.\n   * @param {string=} opt_axisOrientation Axis orientation.\n   */\n  constructor(code, opt_axisOrientation) {\n    super({\n      code: code,\n      units: Units.DEGREES,\n      extent: EXTENT,\n      axisOrientation: opt_axisOrientation,\n      global: true,\n      metersPerUnit: METERS_PER_UNIT,\n      worldExtent: EXTENT\n    });\n\n  }\n\n}\n\n\n/**\n * Projections equal to EPSG:4326.\n *\n * @const\n * @type {Array<module:ol/proj/Projection>}\n */\nexport const PROJECTIONS = [\n  new EPSG4326Projection('CRS:84'),\n  new EPSG4326Projection('EPSG:4326', 'neu'),\n  new EPSG4326Projection('urn:ogc:def:crs:EPSG::4326', 'neu'),\n  new EPSG4326Projection('urn:ogc:def:crs:EPSG:6.6:4326', 'neu'),\n  new EPSG4326Projection('urn:ogc:def:crs:OGC:1.3:CRS84'),\n  new EPSG4326Projection('urn:ogc:def:crs:OGC:2:84'),\n  new EPSG4326Projection('http://www.opengis.net/gml/srs/epsg.xml#4326', 'neu'),\n  new EPSG4326Projection('urn:x-ogc:def:crs:EPSG:4326', 'neu')\n];\n","/**\n * @module ol/proj/projections\n */\n\n\n/**\n * @type {Object<string, module:ol/proj/Projection>}\n */\nlet cache = {};\n\n\n/**\n * Clear the projections cache.\n */\nexport function clear() {\n  cache = {};\n}\n\n\n/**\n * Get a cached projection by code.\n * @param {string} code The code for the projection.\n * @return {module:ol/proj/Projection} The projection (if cached).\n */\nexport function get(code) {\n  return cache[code] || null;\n}\n\n\n/**\n * Add a projection to the cache.\n * @param {string} code The projection code.\n * @param {module:ol/proj/Projection} projection The projection to cache.\n */\nexport function add(code, projection) {\n  cache[code] = projection;\n}\n","/**\n * @module ol/proj/transforms\n */\nimport {isEmpty} from '../obj.js';\n\n\n/**\n * @private\n * @type {!Object<string, Object<string, module:ol/proj~TransformFunction>>}\n */\nlet transforms = {};\n\n\n/**\n * Clear the transform cache.\n */\nexport function clear() {\n  transforms = {};\n}\n\n\n/**\n * Registers a conversion function to convert coordinates from the source\n * projection to the destination projection.\n *\n * @param {module:ol/proj/Projection} source Source.\n * @param {module:ol/proj/Projection} destination Destination.\n * @param {module:ol/proj~TransformFunction} transformFn Transform.\n */\nexport function add(source, destination, transformFn) {\n  const sourceCode = source.getCode();\n  const destinationCode = destination.getCode();\n  if (!(sourceCode in transforms)) {\n    transforms[sourceCode] = {};\n  }\n  transforms[sourceCode][destinationCode] = transformFn;\n}\n\n\n/**\n * Unregisters the conversion function to convert coordinates from the source\n * projection to the destination projection.  This method is used to clean up\n * cached transforms during testing.\n *\n * @param {module:ol/proj/Projection} source Source projection.\n * @param {module:ol/proj/Projection} destination Destination projection.\n * @return {module:ol/proj~TransformFunction} transformFn The unregistered transform.\n */\nexport function remove(source, destination) {\n  const sourceCode = source.getCode();\n  const destinationCode = destination.getCode();\n  const transform = transforms[sourceCode][destinationCode];\n  delete transforms[sourceCode][destinationCode];\n  if (isEmpty(transforms[sourceCode])) {\n    delete transforms[sourceCode];\n  }\n  return transform;\n}\n\n\n/**\n * Get a transform given a source code and a destination code.\n * @param {string} sourceCode The code for the source projection.\n * @param {string} destinationCode The code for the destination projection.\n * @return {module:ol/proj~TransformFunction|undefined} The transform function (if found).\n */\nexport function get(sourceCode, destinationCode) {\n  let transform;\n  if (sourceCode in transforms && destinationCode in transforms[sourceCode]) {\n    transform = transforms[sourceCode][destinationCode];\n  }\n  return transform;\n}\n","/**\n * @module ol/proj\n */\n\n/**\n * The ol/proj module stores:\n * * a list of {@link module:ol/proj/Projection}\n * objects, one for each projection supported by the application\n * * a list of transform functions needed to convert coordinates in one projection\n * into another.\n *\n * The static functions are the methods used to maintain these.\n * Each transform function can handle not only simple coordinate pairs, but also\n * large arrays of coordinates such as vector geometries.\n *\n * When loaded, the library adds projection objects for EPSG:4326 (WGS84\n * geographic coordinates) and EPSG:3857 (Web or Spherical Mercator, as used\n * for example by Bing Maps or OpenStreetMap), together with the relevant\n * transform functions.\n *\n * Additional transforms may be added by using the http://proj4js.org/\n * library (version 2.2 or later). You can use the full build supplied by\n * Proj4js, or create a custom build to support those projections you need; see\n * the Proj4js website for how to do this. You also need the Proj4js definitions\n * for the required projections. These definitions can be obtained from\n * https://epsg.io/, and are a JS function, so can be loaded in a script\n * tag (as in the examples) or pasted into your application.\n *\n * After all required projection definitions are added to proj4's registry (by\n * using `proj4.defs()`), simply call `register(proj4)` from the `ol/proj/proj4`\n * package. Existing transforms are not changed by this function. See\n * examples/wms-image-custom-proj for an example of this.\n *\n * Additional projection definitions can be registered with `proj4.defs()` any\n * time. Just make sure to call `register(proj4)` again; for example, with user-supplied data where you don't\n * know in advance what projections are needed, you can initially load minimal\n * support and then load whichever are requested.\n *\n * Note that Proj4js does not support projection extents. If you want to add\n * one for creating default tile grids, you can add it after the Projection\n * object has been created with `setExtent`, for example,\n * `get('EPSG:1234').setExtent(extent)`.\n *\n * In addition to Proj4js support, any transform functions can be added with\n * {@link module:ol/proj~addCoordinateTransforms}. To use this, you must first create\n * a {@link module:ol/proj/Projection} object for the new projection and add it with\n * {@link module:ol/proj~addProjection}. You can then add the forward and inverse\n * functions with {@link module:ol/proj~addCoordinateTransforms}. See\n * examples/wms-custom-proj for an example of this.\n *\n * Note that if no transforms are needed and you only need to define the\n * projection, just add a {@link module:ol/proj/Projection} with\n * {@link module:ol/proj~addProjection}. See examples/wms-no-proj for an example of\n * this.\n */\nimport {getDistance} from './sphere.js';\nimport {applyTransform} from './extent.js';\nimport {modulo} from './math.js';\nimport {toEPSG4326, fromEPSG4326, PROJECTIONS as EPSG3857_PROJECTIONS} from './proj/epsg3857.js';\nimport {PROJECTIONS as EPSG4326_PROJECTIONS} from './proj/epsg4326.js';\nimport Projection from './proj/Projection.js';\nimport Units, {METERS_PER_UNIT} from './proj/Units.js';\nimport * as projections from './proj/projections.js';\nimport {add as addTransformFunc, clear as clearTransformFuncs, get as getTransformFunc} from './proj/transforms.js';\n\n\n/**\n * A projection as {@link module:ol/proj/Projection}, SRS identifier\n * string or undefined.\n * @typedef {module:ol/proj/Projection|string|undefined} ProjectionLike\n * @api\n */\n\n\n/**\n * A transform function accepts an array of input coordinate values, an optional\n * output array, and an optional dimension (default should be 2).  The function\n * transforms the input coordinate values, populates the output array, and\n * returns the output array.\n *\n * @typedef {function(Array<number>, Array<number>=, number=): Array<number>} TransformFunction\n * @api\n */\n\n\nexport {METERS_PER_UNIT};\n\nexport {Projection};\n\n/**\n * @param {Array<number>} input Input coordinate array.\n * @param {Array<number>=} opt_output Output array of coordinate values.\n * @param {number=} opt_dimension Dimension.\n * @return {Array<number>} Output coordinate array (new array, same coordinate\n *     values).\n */\nexport function cloneTransform(input, opt_output, opt_dimension) {\n  let output;\n  if (opt_output !== undefined) {\n    for (let i = 0, ii = input.length; i < ii; ++i) {\n      opt_output[i] = input[i];\n    }\n    output = opt_output;\n  } else {\n    output = input.slice();\n  }\n  return output;\n}\n\n\n/**\n * @param {Array<number>} input Input coordinate array.\n * @param {Array<number>=} opt_output Output array of coordinate values.\n * @param {number=} opt_dimension Dimension.\n * @return {Array<number>} Input coordinate array (same array as input).\n */\nexport function identityTransform(input, opt_output, opt_dimension) {\n  if (opt_output !== undefined && input !== opt_output) {\n    for (let i = 0, ii = input.length; i < ii; ++i) {\n      opt_output[i] = input[i];\n    }\n    input = opt_output;\n  }\n  return input;\n}\n\n\n/**\n * Add a Projection object to the list of supported projections that can be\n * looked up by their code.\n *\n * @param {module:ol/proj/Projection} projection Projection instance.\n * @api\n */\nexport function addProjection(projection) {\n  projections.add(projection.getCode(), projection);\n  addTransformFunc(projection, projection, cloneTransform);\n}\n\n\n/**\n * @param {Array<module:ol/proj/Projection>} projections Projections.\n */\nexport function addProjections(projections) {\n  projections.forEach(addProjection);\n}\n\n\n/**\n * Fetches a Projection object for the code specified.\n *\n * @param {module:ol/proj~ProjectionLike} projectionLike Either a code string which is\n *     a combination of authority and identifier such as \"EPSG:4326\", or an\n *     existing projection object, or undefined.\n * @return {module:ol/proj/Projection} Projection object, or null if not in list.\n * @api\n */\nexport function get(projectionLike) {\n  let projection = null;\n  if (projectionLike instanceof Projection) {\n    projection = projectionLike;\n  } else if (typeof projectionLike === 'string') {\n    const code = projectionLike;\n    projection = projections.get(code);\n  }\n  return projection;\n}\n\n\n/**\n * Get the resolution of the point in degrees or distance units.\n * For projections with degrees as the unit this will simply return the\n * provided resolution. For other projections the point resolution is\n * by default estimated by transforming the 'point' pixel to EPSG:4326,\n * measuring its width and height on the normal sphere,\n * and taking the average of the width and height.\n * A custom function can be provided for a specific projection, either\n * by setting the `getPointResolution` option in the\n * {@link module:ol/proj/Projection~Projection} constructor or by using\n * {@link module:ol/proj/Projection~Projection#setGetPointResolution} to change an existing\n * projection object.\n * @param {module:ol/proj~ProjectionLike} projection The projection.\n * @param {number} resolution Nominal resolution in projection units.\n * @param {module:ol/coordinate~Coordinate} point Point to find adjusted resolution at.\n * @param {module:ol/proj/Units=} opt_units Units to get the point resolution in.\n * Default is the projection's units.\n * @return {number} Point resolution.\n * @api\n */\nexport function getPointResolution(projection, resolution, point, opt_units) {\n  projection = get(projection);\n  let pointResolution;\n  const getter = projection.getPointResolutionFunc();\n  if (getter) {\n    pointResolution = getter(resolution, point);\n  } else {\n    const units = projection.getUnits();\n    if (units == Units.DEGREES && !opt_units || opt_units == Units.DEGREES) {\n      pointResolution = resolution;\n    } else {\n      // Estimate point resolution by transforming the center pixel to EPSG:4326,\n      // measuring its width and height on the normal sphere, and taking the\n      // average of the width and height.\n      const toEPSG4326 = getTransformFromProjections(projection, get('EPSG:4326'));\n      let vertices = [\n        point[0] - resolution / 2, point[1],\n        point[0] + resolution / 2, point[1],\n        point[0], point[1] - resolution / 2,\n        point[0], point[1] + resolution / 2\n      ];\n      vertices = toEPSG4326(vertices, vertices, 2);\n      const width = getDistance(vertices.slice(0, 2), vertices.slice(2, 4));\n      const height = getDistance(vertices.slice(4, 6), vertices.slice(6, 8));\n      pointResolution = (width + height) / 2;\n      const metersPerUnit = opt_units ?\n        METERS_PER_UNIT[opt_units] :\n        projection.getMetersPerUnit();\n      if (metersPerUnit !== undefined) {\n        pointResolution /= metersPerUnit;\n      }\n    }\n  }\n  return pointResolution;\n}\n\n\n/**\n * Registers transformation functions that don't alter coordinates. Those allow\n * to transform between projections with equal meaning.\n *\n * @param {Array<module:ol/proj/Projection>} projections Projections.\n * @api\n */\nexport function addEquivalentProjections(projections) {\n  addProjections(projections);\n  projections.forEach(function(source) {\n    projections.forEach(function(destination) {\n      if (source !== destination) {\n        addTransformFunc(source, destination, cloneTransform);\n      }\n    });\n  });\n}\n\n\n/**\n * Registers transformation functions to convert coordinates in any projection\n * in projection1 to any projection in projection2.\n *\n * @param {Array<module:ol/proj/Projection>} projections1 Projections with equal\n *     meaning.\n * @param {Array<module:ol/proj/Projection>} projections2 Projections with equal\n *     meaning.\n * @param {module:ol/proj~TransformFunction} forwardTransform Transformation from any\n *   projection in projection1 to any projection in projection2.\n * @param {module:ol/proj~TransformFunction} inverseTransform Transform from any projection\n *   in projection2 to any projection in projection1..\n */\nexport function addEquivalentTransforms(projections1, projections2, forwardTransform, inverseTransform) {\n  projections1.forEach(function(projection1) {\n    projections2.forEach(function(projection2) {\n      addTransformFunc(projection1, projection2, forwardTransform);\n      addTransformFunc(projection2, projection1, inverseTransform);\n    });\n  });\n}\n\n\n/**\n * Clear all cached projections and transforms.\n */\nexport function clearAllProjections() {\n  projections.clear();\n  clearTransformFuncs();\n}\n\n\n/**\n * @param {module:ol/proj/Projection|string|undefined} projection Projection.\n * @param {string} defaultCode Default code.\n * @return {module:ol/proj/Projection} Projection.\n */\nexport function createProjection(projection, defaultCode) {\n  if (!projection) {\n    return get(defaultCode);\n  } else if (typeof projection === 'string') {\n    return get(projection);\n  } else {\n    return (\n      /** @type {module:ol/proj/Projection} */ (projection)\n    );\n  }\n}\n\n\n/**\n * Creates a {@link module:ol/proj~TransformFunction} from a simple 2D coordinate transform\n * function.\n * @param {function(module:ol/coordinate~Coordinate): module:ol/coordinate~Coordinate} coordTransform Coordinate\n *     transform.\n * @return {module:ol/proj~TransformFunction} Transform function.\n */\nexport function createTransformFromCoordinateTransform(coordTransform) {\n  return (\n    /**\n     * @param {Array<number>} input Input.\n     * @param {Array<number>=} opt_output Output.\n     * @param {number=} opt_dimension Dimension.\n     * @return {Array<number>} Output.\n     */\n    function(input, opt_output, opt_dimension) {\n      const length = input.length;\n      const dimension = opt_dimension !== undefined ? opt_dimension : 2;\n      const output = opt_output !== undefined ? opt_output : new Array(length);\n      for (let i = 0; i < length; i += dimension) {\n        const point = coordTransform([input[i], input[i + 1]]);\n        output[i] = point[0];\n        output[i + 1] = point[1];\n        for (let j = dimension - 1; j >= 2; --j) {\n          output[i + j] = input[i + j];\n        }\n      }\n      return output;\n    });\n}\n\n\n/**\n * Registers coordinate transform functions to convert coordinates between the\n * source projection and the destination projection.\n * The forward and inverse functions convert coordinate pairs; this function\n * converts these into the functions used internally which also handle\n * extents and coordinate arrays.\n *\n * @param {module:ol/proj~ProjectionLike} source Source projection.\n * @param {module:ol/proj~ProjectionLike} destination Destination projection.\n * @param {function(module:ol/coordinate~Coordinate): module:ol/coordinate~Coordinate} forward The forward transform\n *     function (that is, from the source projection to the destination\n *     projection) that takes a {@link module:ol/coordinate~Coordinate} as argument and returns\n *     the transformed {@link module:ol/coordinate~Coordinate}.\n * @param {function(module:ol/coordinate~Coordinate): module:ol/coordinate~Coordinate} inverse The inverse transform\n *     function (that is, from the destination projection to the source\n *     projection) that takes a {@link module:ol/coordinate~Coordinate} as argument and returns\n *     the transformed {@link module:ol/coordinate~Coordinate}.\n * @api\n */\nexport function addCoordinateTransforms(source, destination, forward, inverse) {\n  const sourceProj = get(source);\n  const destProj = get(destination);\n  addTransformFunc(sourceProj, destProj, createTransformFromCoordinateTransform(forward));\n  addTransformFunc(destProj, sourceProj, createTransformFromCoordinateTransform(inverse));\n}\n\n\n/**\n * Transforms a coordinate from longitude/latitude to a different projection.\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate as longitude and latitude, i.e.\n *     an array with longitude as 1st and latitude as 2nd element.\n * @param {module:ol/proj~ProjectionLike=} opt_projection Target projection. The\n *     default is Web Mercator, i.e. 'EPSG:3857'.\n * @return {module:ol/coordinate~Coordinate} Coordinate projected to the target projection.\n * @api\n */\nexport function fromLonLat(coordinate, opt_projection) {\n  return transform(coordinate, 'EPSG:4326',\n    opt_projection !== undefined ? opt_projection : 'EPSG:3857');\n}\n\n\n/**\n * Transforms a coordinate to longitude/latitude.\n * @param {module:ol/coordinate~Coordinate} coordinate Projected coordinate.\n * @param {module:ol/proj~ProjectionLike=} opt_projection Projection of the coordinate.\n *     The default is Web Mercator, i.e. 'EPSG:3857'.\n * @return {module:ol/coordinate~Coordinate} Coordinate as longitude and latitude, i.e. an array\n *     with longitude as 1st and latitude as 2nd element.\n * @api\n */\nexport function toLonLat(coordinate, opt_projection) {\n  const lonLat = transform(coordinate,\n    opt_projection !== undefined ? opt_projection : 'EPSG:3857', 'EPSG:4326');\n  const lon = lonLat[0];\n  if (lon < -180 || lon > 180) {\n    lonLat[0] = modulo(lon + 180, 360) - 180;\n  }\n  return lonLat;\n}\n\n\n/**\n * Checks if two projections are the same, that is every coordinate in one\n * projection does represent the same geographic point as the same coordinate in\n * the other projection.\n *\n * @param {module:ol/proj/Projection} projection1 Projection 1.\n * @param {module:ol/proj/Projection} projection2 Projection 2.\n * @return {boolean} Equivalent.\n * @api\n */\nexport function equivalent(projection1, projection2) {\n  if (projection1 === projection2) {\n    return true;\n  }\n  const equalUnits = projection1.getUnits() === projection2.getUnits();\n  if (projection1.getCode() === projection2.getCode()) {\n    return equalUnits;\n  } else {\n    const transformFunc = getTransformFromProjections(projection1, projection2);\n    return transformFunc === cloneTransform && equalUnits;\n  }\n}\n\n\n/**\n * Searches in the list of transform functions for the function for converting\n * coordinates from the source projection to the destination projection.\n *\n * @param {module:ol/proj/Projection} sourceProjection Source Projection object.\n * @param {module:ol/proj/Projection} destinationProjection Destination Projection\n *     object.\n * @return {module:ol/proj~TransformFunction} Transform function.\n */\nexport function getTransformFromProjections(sourceProjection, destinationProjection) {\n  const sourceCode = sourceProjection.getCode();\n  const destinationCode = destinationProjection.getCode();\n  let transformFunc = getTransformFunc(sourceCode, destinationCode);\n  if (!transformFunc) {\n    transformFunc = identityTransform;\n  }\n  return transformFunc;\n}\n\n\n/**\n * Given the projection-like objects, searches for a transformation\n * function to convert a coordinates array from the source projection to the\n * destination projection.\n *\n * @param {module:ol/proj~ProjectionLike} source Source.\n * @param {module:ol/proj~ProjectionLike} destination Destination.\n * @return {module:ol/proj~TransformFunction} Transform function.\n * @api\n */\nexport function getTransform(source, destination) {\n  const sourceProjection = get(source);\n  const destinationProjection = get(destination);\n  return getTransformFromProjections(sourceProjection, destinationProjection);\n}\n\n\n/**\n * Transforms a coordinate from source projection to destination projection.\n * This returns a new coordinate (and does not modify the original).\n *\n * See {@link module:ol/proj~transformExtent} for extent transformation.\n * See the transform method of {@link module:ol/geom/Geometry~Geometry} and its\n * subclasses for geometry transforms.\n *\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @param {module:ol/proj~ProjectionLike} source Source projection-like.\n * @param {module:ol/proj~ProjectionLike} destination Destination projection-like.\n * @return {module:ol/coordinate~Coordinate} Coordinate.\n * @api\n */\nexport function transform(coordinate, source, destination) {\n  const transformFunc = getTransform(source, destination);\n  return transformFunc(coordinate, undefined, coordinate.length);\n}\n\n\n/**\n * Transforms an extent from source projection to destination projection.  This\n * returns a new extent (and does not modify the original).\n *\n * @param {module:ol/extent~Extent} extent The extent to transform.\n * @param {module:ol/proj~ProjectionLike} source Source projection-like.\n * @param {module:ol/proj~ProjectionLike} destination Destination projection-like.\n * @return {module:ol/extent~Extent} The transformed extent.\n * @api\n */\nexport function transformExtent(extent, source, destination) {\n  const transformFunc = getTransform(source, destination);\n  return applyTransform(extent, transformFunc);\n}\n\n\n/**\n * Transforms the given point to the destination projection.\n *\n * @param {module:ol/coordinate~Coordinate} point Point.\n * @param {module:ol/proj/Projection} sourceProjection Source projection.\n * @param {module:ol/proj/Projection} destinationProjection Destination projection.\n * @return {module:ol/coordinate~Coordinate} Point.\n */\nexport function transformWithProjections(point, sourceProjection, destinationProjection) {\n  const transformFunc = getTransformFromProjections(sourceProjection, destinationProjection);\n  return transformFunc(point);\n}\n\n/**\n * Add transforms to and from EPSG:4326 and EPSG:3857.  This function is called\n * by when this module is executed and should only need to be called again after\n * `clearAllProjections()` is called (e.g. in tests).\n */\nexport function addCommon() {\n  // Add transformations that don't alter coordinates to convert within set of\n  // projections with equal meaning.\n  addEquivalentProjections(EPSG3857_PROJECTIONS);\n  addEquivalentProjections(EPSG4326_PROJECTIONS);\n  // Add transformations to convert EPSG:4326 like coordinates to EPSG:3857 like\n  // coordinates and back.\n  addEquivalentTransforms(EPSG4326_PROJECTIONS, EPSG3857_PROJECTIONS, fromEPSG4326, toEPSG4326);\n}\n\naddCommon();\n","/**\n * @module ol/ViewHint\n */\n\n/**\n * @enum {number}\n */\nexport default {\n  ANIMATING: 0,\n  INTERACTING: 1\n};\n","/**\n * @module ol/dom\n */\n\n\n/**\n * Create an html canvas element and returns its 2d context.\n * @param {number=} opt_width Canvas width.\n * @param {number=} opt_height Canvas height.\n * @return {CanvasRenderingContext2D} The context.\n */\nexport function createCanvasContext2D(opt_width, opt_height) {\n  const canvas = /** @type {HTMLCanvasElement} */ (document.createElement('canvas'));\n  if (opt_width) {\n    canvas.width = opt_width;\n  }\n  if (opt_height) {\n    canvas.height = opt_height;\n  }\n  return /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));\n}\n\n\n/**\n * Get the current computed width for the given element including margin,\n * padding and border.\n * Equivalent to jQuery's `$(el).outerWidth(true)`.\n * @param {!HTMLElement} element Element.\n * @return {number} The width.\n */\nexport function outerWidth(element) {\n  let width = element.offsetWidth;\n  const style = getComputedStyle(element);\n  width += parseInt(style.marginLeft, 10) + parseInt(style.marginRight, 10);\n\n  return width;\n}\n\n\n/**\n * Get the current computed height for the given element including margin,\n * padding and border.\n * Equivalent to jQuery's `$(el).outerHeight(true)`.\n * @param {!HTMLElement} element Element.\n * @return {number} The height.\n */\nexport function outerHeight(element) {\n  let height = element.offsetHeight;\n  const style = getComputedStyle(element);\n  height += parseInt(style.marginTop, 10) + parseInt(style.marginBottom, 10);\n\n  return height;\n}\n\n/**\n * @param {Node} newNode Node to replace old node\n * @param {Node} oldNode The node to be replaced\n */\nexport function replaceNode(newNode, oldNode) {\n  const parent = oldNode.parentNode;\n  if (parent) {\n    parent.replaceChild(newNode, oldNode);\n  }\n}\n\n/**\n * @param {Node} node The node to remove.\n * @returns {Node} The node that was removed or null.\n */\nexport function removeNode(node) {\n  return node && node.parentNode ? node.parentNode.removeChild(node) : null;\n}\n\n/**\n * @param {Node} node The node to remove the children from.\n */\nexport function removeChildren(node) {\n  while (node.lastChild) {\n    node.removeChild(node.lastChild);\n  }\n}\n","/**\n * @module ol/geom/GeometryLayout\n */\n\n/**\n * The coordinate layout for geometries, indicating whether a 3rd or 4th z ('Z')\n * or measure ('M') coordinate is available. Supported values are `'XY'`,\n * `'XYZ'`, `'XYM'`, `'XYZM'`.\n * @enum {string}\n */\nexport default {\n  XY: 'XY',\n  XYZ: 'XYZ',\n  XYM: 'XYM',\n  XYZM: 'XYZM'\n};\n","/**\n * @module ol/ImageState\n */\n\n/**\n * @enum {number}\n */\nexport default {\n  IDLE: 0,\n  LOADING: 1,\n  LOADED: 2,\n  ERROR: 3\n};\n","/**\n * @module ol/Object\n */\nimport {getUid} from './util.js';\nimport ObjectEventType from './ObjectEventType.js';\nimport Observable from './Observable.js';\nimport Event from './events/Event.js';\nimport {assign} from './obj.js';\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/Object~BaseObject} instances are instances of this type.\n  */\nclass ObjectEvent extends Event {\n\n  /**\n   * @param {string} type The event type.\n   * @param {string} key The property name.\n   * @param {*} oldValue The old value for `key`.\n   */\n  constructor(type, key, oldValue) {\n    super(type);\n\n    /**\n     * The name of the property whose value is changing.\n     * @type {string}\n     * @api\n     */\n    this.key = key;\n\n    /**\n     * The old value. To get the new value use `e.target.get(e.key)` where\n     * `e` is the event object.\n     * @type {*}\n     * @api\n     */\n    this.oldValue = oldValue;\n\n  }\n\n}\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * Most non-trivial classes inherit from this.\n *\n * This extends {@link module:ol/Observable} with observable\n * properties, where each property is observable as well as the object as a\n * whole.\n *\n * Classes that inherit from this have pre-defined properties, to which you can\n * add your owns. The pre-defined properties are listed in this documentation as\n * 'Observable Properties', and have their own accessors; for example,\n * {@link module:ol/Map~Map} has a `target` property, accessed with\n * `getTarget()` and changed with `setTarget()`. Not all properties are however\n * settable. There are also general-purpose accessors `get()` and `set()`. For\n * example, `get('target')` is equivalent to `getTarget()`.\n *\n * The `set` accessors trigger a change event, and you can monitor this by\n * registering a listener. For example, {@link module:ol/View~View} has a\n * `center` property, so `view.on('change:center', function(evt) {...});` would\n * call the function whenever the value of the center property changes. Within\n * the function, `evt.target` would be the view, so `evt.target.getCenter()`\n * would return the new center.\n *\n * You can add your own observable properties with\n * `object.set('prop', 'value')`, and retrieve that with `object.get('prop')`.\n * You can listen for changes on that property value with\n * `object.on('change:prop', listener)`. You can get a list of all\n * properties with {@link module:ol/Object~BaseObject#getProperties}.\n *\n * Note that the observable properties are separate from standard JS properties.\n * You can, for example, give your map object a title with\n * `map.title='New title'` and with `map.set('title', 'Another title')`. The\n * first will be a `hasOwnProperty`; the second will appear in\n * `getProperties()`. Only the second is observable.\n *\n * Properties can be deleted by using the unset method. E.g.\n * object.unset('foo').\n *\n * @fires module:ol/Object~ObjectEvent\n * @api\n */\nclass BaseObject extends Observable {\n\n  /**\n   * @param {Object<string, *>=} opt_values An object with key-value pairs.\n   */\n  constructor(opt_values) {\n    super();\n\n    // Call {@link module:ol/util~getUid} to ensure that the order of objects' ids is\n    // the same as the order in which they were created.  This also helps to\n    // ensure that object properties are always added in the same order, which\n    // helps many JavaScript engines generate faster code.\n    getUid(this);\n\n    /**\n     * @private\n     * @type {!Object<string, *>}\n     */\n    this.values_ = {};\n\n    if (opt_values !== undefined) {\n      this.setProperties(opt_values);\n    }\n  }\n\n  /**\n   * Gets a value.\n   * @param {string} key Key name.\n   * @return {*} Value.\n   * @api\n   */\n  get(key) {\n    let value;\n    if (this.values_.hasOwnProperty(key)) {\n      value = this.values_[key];\n    }\n    return value;\n  }\n\n  /**\n   * Get a list of object property names.\n   * @return {Array<string>} List of property names.\n   * @api\n   */\n  getKeys() {\n    return Object.keys(this.values_);\n  }\n\n  /**\n   * Get an object of all property names and values.\n   * @return {Object<string, *>} Object.\n   * @api\n   */\n  getProperties() {\n    return assign({}, this.values_);\n  }\n\n  /**\n   * @param {string} key Key name.\n   * @param {*} oldValue Old value.\n   */\n  notify(key, oldValue) {\n    let eventType;\n    eventType = getChangeEventType(key);\n    this.dispatchEvent(new ObjectEvent(eventType, key, oldValue));\n    eventType = ObjectEventType.PROPERTYCHANGE;\n    this.dispatchEvent(new ObjectEvent(eventType, key, oldValue));\n  }\n\n  /**\n   * Sets a value.\n   * @param {string} key Key name.\n   * @param {*} value Value.\n   * @param {boolean=} opt_silent Update without triggering an event.\n   * @api\n   */\n  set(key, value, opt_silent) {\n    if (opt_silent) {\n      this.values_[key] = value;\n    } else {\n      const oldValue = this.values_[key];\n      this.values_[key] = value;\n      if (oldValue !== value) {\n        this.notify(key, oldValue);\n      }\n    }\n  }\n\n  /**\n   * Sets a collection of key-value pairs.  Note that this changes any existing\n   * properties and adds new ones (it does not remove any existing properties).\n   * @param {Object<string, *>} values Values.\n   * @param {boolean=} opt_silent Update without triggering an event.\n   * @api\n   */\n  setProperties(values, opt_silent) {\n    for (const key in values) {\n      this.set(key, values[key], opt_silent);\n    }\n  }\n\n  /**\n   * Unsets a property.\n   * @param {string} key Key name.\n   * @param {boolean=} opt_silent Unset without triggering an event.\n   * @api\n   */\n  unset(key, opt_silent) {\n    if (key in this.values_) {\n      const oldValue = this.values_[key];\n      delete this.values_[key];\n      if (!opt_silent) {\n        this.notify(key, oldValue);\n      }\n    }\n  }\n}\n\n\n/**\n * @type {Object<string, string>}\n */\nconst changeEventTypeCache = {};\n\n\n/**\n * @param {string} key Key name.\n * @return {string} Change name.\n */\nexport function getChangeEventType(key) {\n  return changeEventTypeCache.hasOwnProperty(key) ?\n    changeEventTypeCache[key] :\n    (changeEventTypeCache[key] = 'change:' + key);\n}\n\n\nexport default BaseObject;\n","/**\n * @module ol/has\n */\n\nconst ua = typeof navigator !== 'undefined' ?\n  navigator.userAgent.toLowerCase() : '';\n\n/**\n * User agent string says we are dealing with Firefox as browser.\n * @type {boolean}\n */\nexport const FIREFOX = ua.indexOf('firefox') !== -1;\n\n/**\n * User agent string says we are dealing with Safari as browser.\n * @type {boolean}\n */\nexport const SAFARI = ua.indexOf('safari') !== -1 && ua.indexOf('chrom') == -1;\n\n/**\n * User agent string says we are dealing with a WebKit engine.\n * @type {boolean}\n */\nexport const WEBKIT = ua.indexOf('webkit') !== -1 && ua.indexOf('edge') == -1;\n\n/**\n * User agent string says we are dealing with a Mac as platform.\n * @type {boolean}\n */\nexport const MAC = ua.indexOf('macintosh') !== -1;\n\n\n/**\n * The ratio between physical pixels and device-independent pixels\n * (dips) on the device (`window.devicePixelRatio`).\n * @const\n * @type {number}\n * @api\n */\nexport const DEVICE_PIXEL_RATIO = window.devicePixelRatio || 1;\n\n\n/**\n * True if the browser's Canvas implementation implements {get,set}LineDash.\n * @type {boolean}\n */\nexport const CANVAS_LINE_DASH = function() {\n  let has = false;\n  try {\n    has = !!document.createElement('canvas').getContext('2d').setLineDash;\n  } catch (e) {\n    // pass\n  }\n  return has;\n}();\n\n\n/**\n * Is HTML5 geolocation supported in the current browser?\n * @const\n * @type {boolean}\n * @api\n */\nexport const GEOLOCATION = 'geolocation' in navigator;\n\n\n/**\n * True if browser supports touch events.\n * @const\n * @type {boolean}\n * @api\n */\nexport const TOUCH = 'ontouchstart' in window;\n\n\n/**\n * True if browser supports pointer events.\n * @const\n * @type {boolean}\n */\nexport const POINTER = 'PointerEvent' in window;\n\n\n/**\n * True if browser supports ms pointer events (IE 10).\n * @const\n * @type {boolean}\n */\nexport const MSPOINTER = !!(navigator.msPointerEnabled);\n\n\nexport {HAS as WEBGL} from './webgl.js';\n","/**\n * @module ol/layer/Property\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  OPACITY: 'opacity',\n  VISIBLE: 'visible',\n  EXTENT: 'extent',\n  Z_INDEX: 'zIndex',\n  MAX_RESOLUTION: 'maxResolution',\n  MIN_RESOLUTION: 'minResolution',\n  SOURCE: 'source'\n};\n","/**\n * @module ol/proj/Units\n */\n\n/**\n * Projection units: `'degrees'`, `'ft'`, `'m'`, `'pixels'`, `'tile-pixels'` or\n * `'us-ft'`.\n * @enum {string}\n */\nconst Units = {\n  DEGREES: 'degrees',\n  FEET: 'ft',\n  METERS: 'm',\n  PIXELS: 'pixels',\n  TILE_PIXELS: 'tile-pixels',\n  USFEET: 'us-ft'\n};\n\n\n/**\n * Meters per unit lookup table.\n * @const\n * @type {Object<module:ol/proj/Units, number>}\n * @api\n */\nexport const METERS_PER_UNIT = {};\n// use the radius of the Normal sphere\nMETERS_PER_UNIT[Units.DEGREES] = 2 * Math.PI * 6370997 / 360;\nMETERS_PER_UNIT[Units.FEET] = 0.3048;\nMETERS_PER_UNIT[Units.METERS] = 1;\nMETERS_PER_UNIT[Units.USFEET] = 1200 / 3937;\n\nexport default Units;\n","/**\n * @module ol/Collection\n */\nimport AssertionError from './AssertionError.js';\nimport CollectionEventType from './CollectionEventType.js';\nimport BaseObject from './Object.js';\nimport Event from './events/Event.js';\n\n\n/**\n * @enum {string}\n * @private\n */\nconst Property = {\n  LENGTH: 'length'\n};\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/Collection~Collection} instances are instances of this\n * type.\n */\nexport class CollectionEvent extends Event {\n\n  /**\n   * @param {module:ol/CollectionEventType} type Type.\n   * @param {*=} opt_element Element.\n   */\n  constructor(type, opt_element) {\n    super(type);\n\n    /**\n     * The element that is added to or removed from the collection.\n     * @type {*}\n     * @api\n     */\n    this.element = opt_element;\n\n  }\n\n}\n\n\n/**\n * @typedef {Object} Options\n * @property {boolean} [unique=false] Disallow the same item from being added to\n * the collection twice.\n */\n\n/**\n * @classdesc\n * An expanded version of standard JS Array, adding convenience methods for\n * manipulation. Add and remove changes to the Collection trigger a Collection\n * event. Note that this does not cover changes to the objects _within_ the\n * Collection; they trigger events on the appropriate object, not on the\n * Collection as a whole.\n *\n * @template T\n * @api\n */\nclass Collection extends BaseObject {\n\n  /**\n   * @param {Array<T>=} opt_array Array.\n   * @param {module:ol/Collection~Options=} opt_options Collection options.\n   */\n  constructor(opt_array, opt_options) {\n\n    super();\n\n    const options = opt_options || {};\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.unique_ = !!options.unique;\n\n    /**\n     * @private\n     * @type {!Array<T>}\n     */\n    this.array_ = opt_array ? opt_array : [];\n\n    if (this.unique_) {\n      for (let i = 0, ii = this.array_.length; i < ii; ++i) {\n        this.assertUnique_(this.array_[i], i);\n      }\n    }\n\n    this.updateLength_();\n\n  }\n\n  /**\n   * Remove all elements from the collection.\n   * @api\n   */\n  clear() {\n    while (this.getLength() > 0) {\n      this.pop();\n    }\n  }\n\n  /**\n   * Add elements to the collection.  This pushes each item in the provided array\n   * to the end of the collection.\n   * @param {!Array<T>} arr Array.\n   * @return {module:ol/Collection<T>} This collection.\n   * @api\n   */\n  extend(arr) {\n    for (let i = 0, ii = arr.length; i < ii; ++i) {\n      this.push(arr[i]);\n    }\n    return this;\n  }\n\n  /**\n   * Iterate over each element, calling the provided callback.\n   * @param {function(T, number, Array<T>): *} f The function to call\n   *     for every element. This function takes 3 arguments (the element, the\n   *     index and the array). The return value is ignored.\n   * @api\n   */\n  forEach(f) {\n    const array = this.array_;\n    for (let i = 0, ii = array.length; i < ii; ++i) {\n      f(array[i], i, array);\n    }\n  }\n\n  /**\n   * Get a reference to the underlying Array object. Warning: if the array\n   * is mutated, no events will be dispatched by the collection, and the\n   * collection's \"length\" property won't be in sync with the actual length\n   * of the array.\n   * @return {!Array<T>} Array.\n   * @api\n   */\n  getArray() {\n    return this.array_;\n  }\n\n  /**\n   * Get the element at the provided index.\n   * @param {number} index Index.\n   * @return {T} Element.\n   * @api\n   */\n  item(index) {\n    return this.array_[index];\n  }\n\n  /**\n   * Get the length of this collection.\n   * @return {number} The length of the array.\n   * @observable\n   * @api\n   */\n  getLength() {\n    return /** @type {number} */ (this.get(Property.LENGTH));\n  }\n\n  /**\n   * Insert an element at the provided index.\n   * @param {number} index Index.\n   * @param {T} elem Element.\n   * @api\n   */\n  insertAt(index, elem) {\n    if (this.unique_) {\n      this.assertUnique_(elem);\n    }\n    this.array_.splice(index, 0, elem);\n    this.updateLength_();\n    this.dispatchEvent(\n      new CollectionEvent(CollectionEventType.ADD, elem));\n  }\n\n  /**\n   * Remove the last element of the collection and return it.\n   * Return `undefined` if the collection is empty.\n   * @return {T|undefined} Element.\n   * @api\n   */\n  pop() {\n    return this.removeAt(this.getLength() - 1);\n  }\n\n  /**\n   * Insert the provided element at the end of the collection.\n   * @param {T} elem Element.\n   * @return {number} New length of the collection.\n   * @api\n   */\n  push(elem) {\n    if (this.unique_) {\n      this.assertUnique_(elem);\n    }\n    const n = this.getLength();\n    this.insertAt(n, elem);\n    return this.getLength();\n  }\n\n  /**\n   * Remove the first occurrence of an element from the collection.\n   * @param {T} elem Element.\n   * @return {T|undefined} The removed element or undefined if none found.\n   * @api\n   */\n  remove(elem) {\n    const arr = this.array_;\n    for (let i = 0, ii = arr.length; i < ii; ++i) {\n      if (arr[i] === elem) {\n        return this.removeAt(i);\n      }\n    }\n    return undefined;\n  }\n\n  /**\n   * Remove the element at the provided index and return it.\n   * Return `undefined` if the collection does not contain this index.\n   * @param {number} index Index.\n   * @return {T|undefined} Value.\n   * @api\n   */\n  removeAt(index) {\n    const prev = this.array_[index];\n    this.array_.splice(index, 1);\n    this.updateLength_();\n    this.dispatchEvent(new CollectionEvent(CollectionEventType.REMOVE, prev));\n    return prev;\n  }\n\n  /**\n   * Set the element at the provided index.\n   * @param {number} index Index.\n   * @param {T} elem Element.\n   * @api\n   */\n  setAt(index, elem) {\n    const n = this.getLength();\n    if (index < n) {\n      if (this.unique_) {\n        this.assertUnique_(elem, index);\n      }\n      const prev = this.array_[index];\n      this.array_[index] = elem;\n      this.dispatchEvent(\n        new CollectionEvent(CollectionEventType.REMOVE, prev));\n      this.dispatchEvent(\n        new CollectionEvent(CollectionEventType.ADD, elem));\n    } else {\n      for (let j = n; j < index; ++j) {\n        this.insertAt(j, undefined);\n      }\n      this.insertAt(index, elem);\n    }\n  }\n\n  /**\n   * @private\n   */\n  updateLength_() {\n    this.set(Property.LENGTH, this.array_.length);\n  }\n\n  /**\n   * @private\n   * @param {T} elem Element.\n   * @param {number=} opt_except Optional index to ignore.\n   */\n  assertUnique_(elem, opt_except) {\n    for (let i = 0, ii = this.array_.length; i < ii; ++i) {\n      if (this.array_[i] === elem && i !== opt_except) {\n        throw new AssertionError(58);\n      }\n    }\n  }\n}\n\n\nexport default Collection;\n","/**\n * @module ol/events/Event\n */\n\n/**\n * @classdesc\n * Stripped down implementation of the W3C DOM Level 2 Event interface.\n * See https://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-interface.\n *\n * This implementation only provides `type` and `target` properties, and\n * `stopPropagation` and `preventDefault` methods. It is meant as base class\n * for higher level events defined in the library, and works with\n * {@link module:ol/events/Target~Target}.\n */\nclass Event {\n\n  /**\n   * @param {string} type Type.\n   */\n  constructor(type) {\n\n    /**\n     * @type {boolean}\n     */\n    this.propagationStopped;\n\n    /**\n     * The event type.\n     * @type {string}\n     * @api\n     */\n    this.type = type;\n\n    /**\n     * The event target.\n     * @type {Object}\n     * @api\n     */\n    this.target = null;\n  }\n\n  /**\n   * Stop event propagation.\n   * @function\n   * @api\n   */\n  preventDefault() {\n    this.propagationStopped = true;\n  }\n\n  /**\n   * Stop event propagation.\n   * @function\n   * @api\n   */\n  stopPropagation() {\n    this.propagationStopped = true;\n  }\n\n}\n\n\n/**\n * @param {Event|module:ol/events/Event} evt Event\n */\nexport function stopPropagation(evt) {\n  evt.stopPropagation();\n}\n\n\n/**\n * @param {Event|module:ol/events/Event} evt Event\n */\nexport function preventDefault(evt) {\n  evt.preventDefault();\n}\n\nexport default Event;\n","/**\n * @module ol/easing\n */\n\n\n/**\n * Start slow and speed up.\n * @param {number} t Input between 0 and 1.\n * @return {number} Output between 0 and 1.\n * @api\n */\nexport function easeIn(t) {\n  return Math.pow(t, 3);\n}\n\n\n/**\n * Start fast and slow down.\n * @param {number} t Input between 0 and 1.\n * @return {number} Output between 0 and 1.\n * @api\n */\nexport function easeOut(t) {\n  return 1 - easeIn(1 - t);\n}\n\n\n/**\n * Start slow, speed up, and then slow down again.\n * @param {number} t Input between 0 and 1.\n * @return {number} Output between 0 and 1.\n * @api\n */\nexport function inAndOut(t) {\n  return 3 * t * t - 2 * t * t * t;\n}\n\n\n/**\n * Maintain a constant speed over time.\n * @param {number} t Input between 0 and 1.\n * @return {number} Output between 0 and 1.\n * @api\n */\nexport function linear(t) {\n  return t;\n}\n\n\n/**\n * Start slow, speed up, and at the very end slow down again.  This has the\n * same general behavior as {@link module:ol/easing~inAndOut}, but the final\n * slowdown is delayed.\n * @param {number} t Input between 0 and 1.\n * @return {number} Output between 0 and 1.\n * @api\n */\nexport function upAndDown(t) {\n  if (t < 0.5) {\n    return inAndOut(2 * t);\n  } else {\n    return 1 - inAndOut(2 * (t - 0.5));\n  }\n}\n","/**\n * @module ol/extent/Relationship\n */\n\n/**\n * Relationship to an extent.\n * @enum {number}\n */\nexport default {\n  UNKNOWN: 0,\n  INTERSECTING: 1,\n  ABOVE: 2,\n  RIGHT: 4,\n  BELOW: 8,\n  LEFT: 16\n};\n","/**\n * @module ol/css\n */\n\n\n/**\n * The CSS class for hidden feature.\n *\n * @const\n * @type {string}\n */\nexport const CLASS_HIDDEN = 'ol-hidden';\n\n\n/**\n * The CSS class that we'll give the DOM elements to have them selectable.\n *\n * @const\n * @type {string}\n */\nexport const CLASS_SELECTABLE = 'ol-selectable';\n\n\n/**\n * The CSS class that we'll give the DOM elements to have them unselectable.\n *\n * @const\n * @type {string}\n */\nexport const CLASS_UNSELECTABLE = 'ol-unselectable';\n\n\n/**\n * The CSS class for unsupported feature.\n *\n * @const\n * @type {string}\n */\nexport const CLASS_UNSUPPORTED = 'ol-unsupported';\n\n\n/**\n * The CSS class for controls.\n *\n * @const\n * @type {string}\n */\nexport const CLASS_CONTROL = 'ol-control';\n\n\n/**\n * The CSS class that we'll give the DOM elements that are collapsed, i.e.\n * to those elements which usually can be expanded.\n *\n * @const\n * @type {string}\n */\nexport const CLASS_COLLAPSED = 'ol-collapsed';\n\n\n/**\n * Get the list of font families from a font spec.  Note that this doesn't work\n * for font families that have commas in them.\n * @param {string} The CSS font property.\n * @return {Object<string>} The font families (or null if the input spec is invalid).\n */\nexport const getFontFamilies = (function() {\n  let style;\n  const cache = {};\n  return function(font) {\n    if (!style) {\n      style = document.createElement('div').style;\n    }\n    if (!(font in cache)) {\n      style.font = font;\n      const family = style.fontFamily;\n      style.font = '';\n      if (!family) {\n        return null;\n      }\n      cache[font] = family.split(/,\\s?/);\n    }\n    return cache[font];\n  };\n})();\n","/**\n * @module ol/geom/SimpleGeometry\n */\nimport {FALSE} from '../functions.js';\nimport {createOrUpdateFromFlatCoordinates, getCenter} from '../extent.js';\nimport Geometry from '../geom/Geometry.js';\nimport GeometryLayout from '../geom/GeometryLayout.js';\nimport {rotate, scale, translate, transform2D} from '../geom/flat/transform.js';\nimport {clear} from '../obj.js';\n\n/**\n * @classdesc\n * Abstract base class; only used for creating subclasses; do not instantiate\n * in apps, as cannot be rendered.\n *\n * @abstract\n * @api\n */\nclass SimpleGeometry extends Geometry {\n  constructor() {\n\n    super();\n\n    /**\n     * @protected\n     * @type {module:ol/geom/GeometryLayout}\n     */\n    this.layout = GeometryLayout.XY;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.stride = 2;\n\n    /**\n     * @protected\n     * @type {Array<number>}\n     */\n    this.flatCoordinates = null;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  computeExtent(extent) {\n    return createOrUpdateFromFlatCoordinates(this.flatCoordinates,\n      0, this.flatCoordinates.length, this.stride, extent);\n  }\n\n  /**\n   * @abstract\n   * @return {Array} Coordinates.\n   */\n  getCoordinates() {}\n\n  /**\n   * Return the first coordinate of the geometry.\n   * @return {module:ol/coordinate~Coordinate} First coordinate.\n   * @api\n   */\n  getFirstCoordinate() {\n    return this.flatCoordinates.slice(0, this.stride);\n  }\n\n  /**\n   * @return {Array<number>} Flat coordinates.\n   */\n  getFlatCoordinates() {\n    return this.flatCoordinates;\n  }\n\n  /**\n   * Return the last coordinate of the geometry.\n   * @return {module:ol/coordinate~Coordinate} Last point.\n   * @api\n   */\n  getLastCoordinate() {\n    return this.flatCoordinates.slice(this.flatCoordinates.length - this.stride);\n  }\n\n  /**\n   * Return the {@link module:ol/geom/GeometryLayout~GeometryLayout layout} of the geometry.\n   * @return {module:ol/geom/GeometryLayout} Layout.\n   * @api\n   */\n  getLayout() {\n    return this.layout;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometry(squaredTolerance) {\n    if (this.simplifiedGeometryRevision != this.getRevision()) {\n      clear(this.simplifiedGeometryCache);\n      this.simplifiedGeometryMaxMinSquaredTolerance = 0;\n      this.simplifiedGeometryRevision = this.getRevision();\n    }\n    // If squaredTolerance is negative or if we know that simplification will not\n    // have any effect then just return this.\n    if (squaredTolerance < 0 ||\n        (this.simplifiedGeometryMaxMinSquaredTolerance !== 0 &&\n         squaredTolerance <= this.simplifiedGeometryMaxMinSquaredTolerance)) {\n      return this;\n    }\n    const key = squaredTolerance.toString();\n    if (this.simplifiedGeometryCache.hasOwnProperty(key)) {\n      return this.simplifiedGeometryCache[key];\n    } else {\n      const simplifiedGeometry =\n          this.getSimplifiedGeometryInternal(squaredTolerance);\n      const simplifiedFlatCoordinates = simplifiedGeometry.getFlatCoordinates();\n      if (simplifiedFlatCoordinates.length < this.flatCoordinates.length) {\n        this.simplifiedGeometryCache[key] = simplifiedGeometry;\n        return simplifiedGeometry;\n      } else {\n        // Simplification did not actually remove any coordinates.  We now know\n        // that any calls to getSimplifiedGeometry with a squaredTolerance less\n        // than or equal to the current squaredTolerance will also not have any\n        // effect.  This allows us to short circuit simplification (saving CPU\n        // cycles) and prevents the cache of simplified geometries from filling\n        // up with useless identical copies of this geometry (saving memory).\n        this.simplifiedGeometryMaxMinSquaredTolerance = squaredTolerance;\n        return this;\n      }\n    }\n  }\n\n  /**\n   * @param {number} squaredTolerance Squared tolerance.\n   * @return {module:ol/geom/SimpleGeometry} Simplified geometry.\n   * @protected\n   */\n  getSimplifiedGeometryInternal(squaredTolerance) {\n    return this;\n  }\n\n  /**\n   * @return {number} Stride.\n   */\n  getStride() {\n    return this.stride;\n  }\n\n  /**\n   * @param {module:ol/geom/GeometryLayout} layout Layout.\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n    */\n  setFlatCoordinates(layout, flatCoordinates) {\n    this.stride = getStrideForLayout(layout);\n    this.layout = layout;\n    this.flatCoordinates = flatCoordinates;\n  }\n\n  /**\n   * @abstract\n   * @param {!Array} coordinates Coordinates.\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   */\n  setCoordinates(coordinates, opt_layout) {}\n\n  /**\n   * @param {module:ol/geom/GeometryLayout|undefined} layout Layout.\n   * @param {Array} coordinates Coordinates.\n   * @param {number} nesting Nesting.\n   * @protected\n   */\n  setLayout(layout, coordinates, nesting) {\n    /** @type {number} */\n    let stride;\n    if (layout) {\n      stride = getStrideForLayout(layout);\n    } else {\n      for (let i = 0; i < nesting; ++i) {\n        if (coordinates.length === 0) {\n          this.layout = GeometryLayout.XY;\n          this.stride = 2;\n          return;\n        } else {\n          coordinates = /** @type {Array} */ (coordinates[0]);\n        }\n      }\n      stride = coordinates.length;\n      layout = getLayoutForStride(stride);\n    }\n    this.layout = layout;\n    this.stride = stride;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  applyTransform(transformFn) {\n    if (this.flatCoordinates) {\n      transformFn(this.flatCoordinates, this.flatCoordinates, this.stride);\n      this.changed();\n    }\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  rotate(angle, anchor) {\n    const flatCoordinates = this.getFlatCoordinates();\n    if (flatCoordinates) {\n      const stride = this.getStride();\n      rotate(\n        flatCoordinates, 0, flatCoordinates.length,\n        stride, angle, anchor, flatCoordinates);\n      this.changed();\n    }\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  scale(sx, opt_sy, opt_anchor) {\n    let sy = opt_sy;\n    if (sy === undefined) {\n      sy = sx;\n    }\n    let anchor = opt_anchor;\n    if (!anchor) {\n      anchor = getCenter(this.getExtent());\n    }\n    const flatCoordinates = this.getFlatCoordinates();\n    if (flatCoordinates) {\n      const stride = this.getStride();\n      scale(\n        flatCoordinates, 0, flatCoordinates.length,\n        stride, sx, sy, anchor, flatCoordinates);\n      this.changed();\n    }\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  translate(deltaX, deltaY) {\n    const flatCoordinates = this.getFlatCoordinates();\n    if (flatCoordinates) {\n      const stride = this.getStride();\n      translate(\n        flatCoordinates, 0, flatCoordinates.length, stride,\n        deltaX, deltaY, flatCoordinates);\n      this.changed();\n    }\n  }\n}\n\n\n/**\n * @param {number} stride Stride.\n * @return {module:ol/geom/GeometryLayout} layout Layout.\n */\nfunction getLayoutForStride(stride) {\n  let layout;\n  if (stride == 2) {\n    layout = GeometryLayout.XY;\n  } else if (stride == 3) {\n    layout = GeometryLayout.XYZ;\n  } else if (stride == 4) {\n    layout = GeometryLayout.XYZM;\n  }\n  return (\n    /** @type {module:ol/geom/GeometryLayout} */ (layout)\n  );\n}\n\n\n/**\n * @param {module:ol/geom/GeometryLayout} layout Layout.\n * @return {number} Stride.\n */\nexport function getStrideForLayout(layout) {\n  let stride;\n  if (layout == GeometryLayout.XY) {\n    stride = 2;\n  } else if (layout == GeometryLayout.XYZ || layout == GeometryLayout.XYM) {\n    stride = 3;\n  } else if (layout == GeometryLayout.XYZM) {\n    stride = 4;\n  }\n  return /** @type {number} */ (stride);\n}\n\n\n/**\n * @inheritDoc\n */\nSimpleGeometry.prototype.containsXY = FALSE;\n\n\n/**\n * @param {module:ol/geom/SimpleGeometry} simpleGeometry Simple geometry.\n * @param {module:ol/transform~Transform} transform Transform.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Transformed flat coordinates.\n */\nexport function transformGeom2D(simpleGeometry, transform, opt_dest) {\n  const flatCoordinates = simpleGeometry.getFlatCoordinates();\n  if (!flatCoordinates) {\n    return null;\n  } else {\n    const stride = simpleGeometry.getStride();\n    return transform2D(\n      flatCoordinates, 0, flatCoordinates.length, stride,\n      transform, opt_dest);\n  }\n}\n\nexport default SimpleGeometry;\n","/**\n * @module ol/CollectionEventType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  /**\n   * Triggered when an item is added to the collection.\n   * @event module:ol/Collection~CollectionEvent#add\n   * @api\n   */\n  ADD: 'add',\n  /**\n   * Triggered when an item is removed from the collection.\n   * @event module:ol/Collection~CollectionEvent#remove\n   * @api\n   */\n  REMOVE: 'remove'\n};\n","/**\n * @module ol/geom/flat/transform\n */\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {module:ol/transform~Transform} transform Transform.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Transformed coordinates.\n */\nexport function transform2D(flatCoordinates, offset, end, stride, transform, opt_dest) {\n  const dest = opt_dest ? opt_dest : [];\n  let i = 0;\n  for (let j = offset; j < end; j += stride) {\n    const x = flatCoordinates[j];\n    const y = flatCoordinates[j + 1];\n    dest[i++] = transform[0] * x + transform[2] * y + transform[4];\n    dest[i++] = transform[1] * x + transform[3] * y + transform[5];\n  }\n  if (opt_dest && dest.length != i) {\n    dest.length = i;\n  }\n  return dest;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} angle Angle.\n * @param {Array<number>} anchor Rotation anchor point.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Transformed coordinates.\n */\nexport function rotate(flatCoordinates, offset, end, stride, angle, anchor, opt_dest) {\n  const dest = opt_dest ? opt_dest : [];\n  const cos = Math.cos(angle);\n  const sin = Math.sin(angle);\n  const anchorX = anchor[0];\n  const anchorY = anchor[1];\n  let i = 0;\n  for (let j = offset; j < end; j += stride) {\n    const deltaX = flatCoordinates[j] - anchorX;\n    const deltaY = flatCoordinates[j + 1] - anchorY;\n    dest[i++] = anchorX + deltaX * cos - deltaY * sin;\n    dest[i++] = anchorY + deltaX * sin + deltaY * cos;\n    for (let k = j + 2; k < j + stride; ++k) {\n      dest[i++] = flatCoordinates[k];\n    }\n  }\n  if (opt_dest && dest.length != i) {\n    dest.length = i;\n  }\n  return dest;\n}\n\n\n/**\n * Scale the coordinates.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} sx Scale factor in the x-direction.\n * @param {number} sy Scale factor in the y-direction.\n * @param {Array<number>} anchor Scale anchor point.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Transformed coordinates.\n */\nexport function scale(flatCoordinates, offset, end, stride, sx, sy, anchor, opt_dest) {\n  const dest = opt_dest ? opt_dest : [];\n  const anchorX = anchor[0];\n  const anchorY = anchor[1];\n  let i = 0;\n  for (let j = offset; j < end; j += stride) {\n    const deltaX = flatCoordinates[j] - anchorX;\n    const deltaY = flatCoordinates[j + 1] - anchorY;\n    dest[i++] = anchorX + sx * deltaX;\n    dest[i++] = anchorY + sy * deltaY;\n    for (let k = j + 2; k < j + stride; ++k) {\n      dest[i++] = flatCoordinates[k];\n    }\n  }\n  if (opt_dest && dest.length != i) {\n    dest.length = i;\n  }\n  return dest;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} deltaX Delta X.\n * @param {number} deltaY Delta Y.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Transformed coordinates.\n */\nexport function translate(flatCoordinates, offset, end, stride, deltaX, deltaY, opt_dest) {\n  const dest = opt_dest ? opt_dest : [];\n  let i = 0;\n  for (let j = offset; j < end; j += stride) {\n    dest[i++] = flatCoordinates[j] + deltaX;\n    dest[i++] = flatCoordinates[j + 1] + deltaY;\n    for (let k = j + 2; k < j + stride; ++k) {\n      dest[i++] = flatCoordinates[k];\n    }\n  }\n  if (opt_dest && dest.length != i) {\n    dest.length = i;\n  }\n  return dest;\n}\n","/**\n * @module ol/LayerType\n */\n\n/**\n * A layer type used when creating layer renderers.\n * @enum {string}\n */\nexport default {\n  IMAGE: 'IMAGE',\n  TILE: 'TILE',\n  VECTOR_TILE: 'VECTOR_TILE',\n  VECTOR: 'VECTOR'\n};\n","/**\n * @module ol/source/State\n */\n\n/**\n * State of the source, one of 'undefined', 'loading', 'ready' or 'error'.\n * @enum {string}\n */\nexport default {\n  UNDEFINED: 'undefined',\n  LOADING: 'loading',\n  READY: 'ready',\n  ERROR: 'error'\n};\n","/**\n * @module ol/geom/flat/inflate\n */\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {Array<module:ol/coordinate~Coordinate>=} opt_coordinates Coordinates.\n * @return {Array<module:ol/coordinate~Coordinate>} Coordinates.\n */\nexport function inflateCoordinates(flatCoordinates, offset, end, stride, opt_coordinates) {\n  const coordinates = opt_coordinates !== undefined ? opt_coordinates : [];\n  let i = 0;\n  for (let j = offset; j < end; j += stride) {\n    coordinates[i++] = flatCoordinates.slice(j, j + stride);\n  }\n  coordinates.length = i;\n  return coordinates;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {Array<Array<module:ol/coordinate~Coordinate>>=} opt_coordinatess Coordinatess.\n * @return {Array<Array<module:ol/coordinate~Coordinate>>} Coordinatess.\n */\nexport function inflateCoordinatesArray(flatCoordinates, offset, ends, stride, opt_coordinatess) {\n  const coordinatess = opt_coordinatess !== undefined ? opt_coordinatess : [];\n  let i = 0;\n  for (let j = 0, jj = ends.length; j < jj; ++j) {\n    const end = ends[j];\n    coordinatess[i++] = inflateCoordinates(\n      flatCoordinates, offset, end, stride, coordinatess[i]);\n    offset = end;\n  }\n  coordinatess.length = i;\n  return coordinatess;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {Array<Array<Array<module:ol/coordinate~Coordinate>>>=} opt_coordinatesss\n *     Coordinatesss.\n * @return {Array<Array<Array<module:ol/coordinate~Coordinate>>>} Coordinatesss.\n */\nexport function inflateMultiCoordinatesArray(flatCoordinates, offset, endss, stride, opt_coordinatesss) {\n  const coordinatesss = opt_coordinatesss !== undefined ? opt_coordinatesss : [];\n  let i = 0;\n  for (let j = 0, jj = endss.length; j < jj; ++j) {\n    const ends = endss[j];\n    coordinatesss[i++] = inflateCoordinatesArray(\n      flatCoordinates, offset, ends, stride, coordinatesss[i]);\n    offset = ends[ends.length - 1];\n  }\n  coordinatesss.length = i;\n  return coordinatesss;\n}\n","/**\n * @module ol/size\n */\n\n\n/**\n * An array of numbers representing a size: `[width, height]`.\n * @typedef {Array<number>} Size\n * @api\n */\n\n\n/**\n * Returns a buffered size.\n * @param {module:ol/size~Size} size Size.\n * @param {number} num The amount by which to buffer.\n * @param {module:ol/size~Size=} opt_size Optional reusable size array.\n * @return {module:ol/size~Size} The buffered size.\n */\nexport function buffer(size, num, opt_size) {\n  if (opt_size === undefined) {\n    opt_size = [0, 0];\n  }\n  opt_size[0] = size[0] + 2 * num;\n  opt_size[1] = size[1] + 2 * num;\n  return opt_size;\n}\n\n\n/**\n * Determines if a size has a positive area.\n * @param {module:ol/size~Size} size The size to test.\n * @return {boolean} The size has a positive area.\n */\nexport function hasArea(size) {\n  return size[0] > 0 && size[1] > 0;\n}\n\n\n/**\n * Returns a size scaled by a ratio. The result will be an array of integers.\n * @param {module:ol/size~Size} size Size.\n * @param {number} ratio Ratio.\n * @param {module:ol/size~Size=} opt_size Optional reusable size array.\n * @return {module:ol/size~Size} The scaled size.\n */\nexport function scale(size, ratio, opt_size) {\n  if (opt_size === undefined) {\n    opt_size = [0, 0];\n  }\n  opt_size[0] = (size[0] * ratio + 0.5) | 0;\n  opt_size[1] = (size[1] * ratio + 0.5) | 0;\n  return opt_size;\n}\n\n\n/**\n * Returns an `module:ol/size~Size` array for the passed in number (meaning: square) or\n * `module:ol/size~Size` array.\n * (meaning: non-square),\n * @param {number|module:ol/size~Size} size Width and height.\n * @param {module:ol/size~Size=} opt_size Optional reusable size array.\n * @return {module:ol/size~Size} Size.\n * @api\n */\nexport function toSize(size, opt_size) {\n  if (Array.isArray(size)) {\n    return size;\n  } else {\n    if (opt_size === undefined) {\n      opt_size = [size, size];\n    } else {\n      opt_size[0] = opt_size[1] = /** @type {number} */ (size);\n    }\n    return opt_size;\n  }\n}\n","/**\n * @module ol/geom/flat/closest\n */\nimport {lerp, squaredDistance as squaredDx} from '../../math.js';\n\n\n/**\n * Returns the point on the 2D line segment flatCoordinates[offset1] to\n * flatCoordinates[offset2] that is closest to the point (x, y).  Extra\n * dimensions are linearly interpolated.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset1 Offset 1.\n * @param {number} offset2 Offset 2.\n * @param {number} stride Stride.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {Array<number>} closestPoint Closest point.\n */\nfunction assignClosest(flatCoordinates, offset1, offset2, stride, x, y, closestPoint) {\n  const x1 = flatCoordinates[offset1];\n  const y1 = flatCoordinates[offset1 + 1];\n  const dx = flatCoordinates[offset2] - x1;\n  const dy = flatCoordinates[offset2 + 1] - y1;\n  let offset;\n  if (dx === 0 && dy === 0) {\n    offset = offset1;\n  } else {\n    const t = ((x - x1) * dx + (y - y1) * dy) / (dx * dx + dy * dy);\n    if (t > 1) {\n      offset = offset2;\n    } else if (t > 0) {\n      for (let i = 0; i < stride; ++i) {\n        closestPoint[i] = lerp(flatCoordinates[offset1 + i],\n          flatCoordinates[offset2 + i], t);\n      }\n      closestPoint.length = stride;\n      return;\n    } else {\n      offset = offset1;\n    }\n  }\n  for (let i = 0; i < stride; ++i) {\n    closestPoint[i] = flatCoordinates[offset + i];\n  }\n  closestPoint.length = stride;\n}\n\n\n/**\n * Return the squared of the largest distance between any pair of consecutive\n * coordinates.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} max Max squared delta.\n * @return {number} Max squared delta.\n */\nexport function maxSquaredDelta(flatCoordinates, offset, end, stride, max) {\n  let x1 = flatCoordinates[offset];\n  let y1 = flatCoordinates[offset + 1];\n  for (offset += stride; offset < end; offset += stride) {\n    const x2 = flatCoordinates[offset];\n    const y2 = flatCoordinates[offset + 1];\n    const squaredDelta = squaredDx(x1, y1, x2, y2);\n    if (squaredDelta > max) {\n      max = squaredDelta;\n    }\n    x1 = x2;\n    y1 = y2;\n  }\n  return max;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {number} max Max squared delta.\n * @return {number} Max squared delta.\n */\nexport function arrayMaxSquaredDelta(flatCoordinates, offset, ends, stride, max) {\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    max = maxSquaredDelta(\n      flatCoordinates, offset, end, stride, max);\n    offset = end;\n  }\n  return max;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {number} max Max squared delta.\n * @return {number} Max squared delta.\n */\nexport function multiArrayMaxSquaredDelta(flatCoordinates, offset, endss, stride, max) {\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    max = arrayMaxSquaredDelta(\n      flatCoordinates, offset, ends, stride, max);\n    offset = ends[ends.length - 1];\n  }\n  return max;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} maxDelta Max delta.\n * @param {boolean} isRing Is ring.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {Array<number>} closestPoint Closest point.\n * @param {number} minSquaredDistance Minimum squared distance.\n * @param {Array<number>=} opt_tmpPoint Temporary point object.\n * @return {number} Minimum squared distance.\n */\nexport function assignClosestPoint(flatCoordinates, offset, end,\n  stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance,\n  opt_tmpPoint) {\n  if (offset == end) {\n    return minSquaredDistance;\n  }\n  let i, squaredDistance;\n  if (maxDelta === 0) {\n    // All points are identical, so just test the first point.\n    squaredDistance = squaredDx(\n      x, y, flatCoordinates[offset], flatCoordinates[offset + 1]);\n    if (squaredDistance < minSquaredDistance) {\n      for (i = 0; i < stride; ++i) {\n        closestPoint[i] = flatCoordinates[offset + i];\n      }\n      closestPoint.length = stride;\n      return squaredDistance;\n    } else {\n      return minSquaredDistance;\n    }\n  }\n  const tmpPoint = opt_tmpPoint ? opt_tmpPoint : [NaN, NaN];\n  let index = offset + stride;\n  while (index < end) {\n    assignClosest(\n      flatCoordinates, index - stride, index, stride, x, y, tmpPoint);\n    squaredDistance = squaredDx(x, y, tmpPoint[0], tmpPoint[1]);\n    if (squaredDistance < minSquaredDistance) {\n      minSquaredDistance = squaredDistance;\n      for (i = 0; i < stride; ++i) {\n        closestPoint[i] = tmpPoint[i];\n      }\n      closestPoint.length = stride;\n      index += stride;\n    } else {\n      // Skip ahead multiple points, because we know that all the skipped\n      // points cannot be any closer than the closest point we have found so\n      // far.  We know this because we know how close the current point is, how\n      // close the closest point we have found so far is, and the maximum\n      // distance between consecutive points.  For example, if we're currently\n      // at distance 10, the best we've found so far is 3, and that the maximum\n      // distance between consecutive points is 2, then we'll need to skip at\n      // least (10 - 3) / 2 == 3 (rounded down) points to have any chance of\n      // finding a closer point.  We use Math.max(..., 1) to ensure that we\n      // always advance at least one point, to avoid an infinite loop.\n      index += stride * Math.max(\n        ((Math.sqrt(squaredDistance) -\n            Math.sqrt(minSquaredDistance)) / maxDelta) | 0, 1);\n    }\n  }\n  if (isRing) {\n    // Check the closing segment.\n    assignClosest(\n      flatCoordinates, end - stride, offset, stride, x, y, tmpPoint);\n    squaredDistance = squaredDx(x, y, tmpPoint[0], tmpPoint[1]);\n    if (squaredDistance < minSquaredDistance) {\n      minSquaredDistance = squaredDistance;\n      for (i = 0; i < stride; ++i) {\n        closestPoint[i] = tmpPoint[i];\n      }\n      closestPoint.length = stride;\n    }\n  }\n  return minSquaredDistance;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {number} maxDelta Max delta.\n * @param {boolean} isRing Is ring.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {Array<number>} closestPoint Closest point.\n * @param {number} minSquaredDistance Minimum squared distance.\n * @param {Array<number>=} opt_tmpPoint Temporary point object.\n * @return {number} Minimum squared distance.\n */\nexport function assignClosestArrayPoint(flatCoordinates, offset, ends,\n  stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance,\n  opt_tmpPoint) {\n  const tmpPoint = opt_tmpPoint ? opt_tmpPoint : [NaN, NaN];\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    minSquaredDistance = assignClosestPoint(\n      flatCoordinates, offset, end, stride,\n      maxDelta, isRing, x, y, closestPoint, minSquaredDistance, tmpPoint);\n    offset = end;\n  }\n  return minSquaredDistance;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {number} maxDelta Max delta.\n * @param {boolean} isRing Is ring.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {Array<number>} closestPoint Closest point.\n * @param {number} minSquaredDistance Minimum squared distance.\n * @param {Array<number>=} opt_tmpPoint Temporary point object.\n * @return {number} Minimum squared distance.\n */\nexport function assignClosestMultiArrayPoint(flatCoordinates, offset,\n  endss, stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance,\n  opt_tmpPoint) {\n  const tmpPoint = opt_tmpPoint ? opt_tmpPoint : [NaN, NaN];\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    minSquaredDistance = assignClosestArrayPoint(\n      flatCoordinates, offset, ends, stride,\n      maxDelta, isRing, x, y, closestPoint, minSquaredDistance, tmpPoint);\n    offset = ends[ends.length - 1];\n  }\n  return minSquaredDistance;\n}\n","/**\n * @module ol/events/Target\n */\nimport Disposable from '../Disposable.js';\nimport {unlistenAll} from '../events.js';\nimport {VOID} from '../functions.js';\nimport Event from '../events/Event.js';\n\n\n/**\n * @typedef {EventTarget|module:ol/events/Target} EventTargetLike\n */\n\n\n/**\n * @classdesc\n * A simplified implementation of the W3C DOM Level 2 EventTarget interface.\n * See https://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/events.html#Events-EventTarget.\n *\n * There are two important simplifications compared to the specification:\n *\n * 1. The handling of `useCapture` in `addEventListener` and\n *    `removeEventListener`. There is no real capture model.\n * 2. The handling of `stopPropagation` and `preventDefault` on `dispatchEvent`.\n *    There is no event target hierarchy. When a listener calls\n *    `stopPropagation` or `preventDefault` on an event object, it means that no\n *    more listeners after this one will be called. Same as when the listener\n *    returns false.\n */\nclass Target extends Disposable {\n  constructor() {\n\n    super();\n\n    /**\n     * @private\n     * @type {!Object<string, number>}\n     */\n    this.pendingRemovals_ = {};\n\n    /**\n     * @private\n     * @type {!Object<string, number>}\n     */\n    this.dispatching_ = {};\n\n    /**\n     * @private\n     * @type {!Object<string, Array<module:ol/events~ListenerFunction>>}\n     */\n    this.listeners_ = {};\n\n  }\n\n  /**\n   * @param {string} type Type.\n   * @param {module:ol/events~ListenerFunction} listener Listener.\n   */\n  addEventListener(type, listener) {\n    let listeners = this.listeners_[type];\n    if (!listeners) {\n      listeners = this.listeners_[type] = [];\n    }\n    if (listeners.indexOf(listener) === -1) {\n      listeners.push(listener);\n    }\n  }\n\n  /**\n   * Dispatches an event and calls all listeners listening for events\n   * of this type. The event parameter can either be a string or an\n   * Object with a `type` property.\n   *\n   * @param {{type: string,\n   *     target: (module:ol/events/Target~EventTargetLike|undefined)}|\n   *     module:ol/events/Event|string} event Event object.\n   * @return {boolean|undefined} `false` if anyone called preventDefault on the\n   *     event object or if any of the listeners returned false.\n   * @function\n   * @api\n   */\n  dispatchEvent(event) {\n    const evt = typeof event === 'string' ? new Event(event) : event;\n    const type = evt.type;\n    evt.target = this;\n    const listeners = this.listeners_[type];\n    let propagate;\n    if (listeners) {\n      if (!(type in this.dispatching_)) {\n        this.dispatching_[type] = 0;\n        this.pendingRemovals_[type] = 0;\n      }\n      ++this.dispatching_[type];\n      for (let i = 0, ii = listeners.length; i < ii; ++i) {\n        if (listeners[i].call(this, evt) === false || evt.propagationStopped) {\n          propagate = false;\n          break;\n        }\n      }\n      --this.dispatching_[type];\n      if (this.dispatching_[type] === 0) {\n        let pendingRemovals = this.pendingRemovals_[type];\n        delete this.pendingRemovals_[type];\n        while (pendingRemovals--) {\n          this.removeEventListener(type, VOID);\n        }\n        delete this.dispatching_[type];\n      }\n      return propagate;\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    unlistenAll(this);\n  }\n\n  /**\n   * Get the listeners for a specified event type. Listeners are returned in the\n   * order that they will be called in.\n   *\n   * @param {string} type Type.\n   * @return {Array<module:ol/events~ListenerFunction>} Listeners.\n   */\n  getListeners(type) {\n    return this.listeners_[type];\n  }\n\n  /**\n   * @param {string=} opt_type Type. If not provided,\n   *     `true` will be returned if this event target has any listeners.\n   * @return {boolean} Has listeners.\n   */\n  hasListener(opt_type) {\n    return opt_type ?\n      opt_type in this.listeners_ :\n      Object.keys(this.listeners_).length > 0;\n  }\n\n  /**\n   * @param {string} type Type.\n   * @param {module:ol/events~ListenerFunction} listener Listener.\n   */\n  removeEventListener(type, listener) {\n    const listeners = this.listeners_[type];\n    if (listeners) {\n      const index = listeners.indexOf(listener);\n      if (type in this.pendingRemovals_) {\n        // make listener a no-op, and remove later in #dispatchEvent()\n        listeners[index] = VOID;\n        ++this.pendingRemovals_[type];\n      } else {\n        listeners.splice(index, 1);\n        if (listeners.length === 0) {\n          delete this.listeners_[type];\n        }\n      }\n    }\n  }\n}\n\n\nexport default Target;\n","/**\n * @module ol/geom/flat/deflate\n */\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @param {number} stride Stride.\n * @return {number} offset Offset.\n */\nexport function deflateCoordinate(flatCoordinates, offset, coordinate, stride) {\n  for (let i = 0, ii = coordinate.length; i < ii; ++i) {\n    flatCoordinates[offset++] = coordinate[i];\n  }\n  return offset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<module:ol/coordinate~Coordinate>} coordinates Coordinates.\n * @param {number} stride Stride.\n * @return {number} offset Offset.\n */\nexport function deflateCoordinates(flatCoordinates, offset, coordinates, stride) {\n  for (let i = 0, ii = coordinates.length; i < ii; ++i) {\n    const coordinate = coordinates[i];\n    for (let j = 0; j < stride; ++j) {\n      flatCoordinates[offset++] = coordinate[j];\n    }\n  }\n  return offset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<module:ol/coordinate~Coordinate>>} coordinatess Coordinatess.\n * @param {number} stride Stride.\n * @param {Array<number>=} opt_ends Ends.\n * @return {Array<number>} Ends.\n */\nexport function deflateCoordinatesArray(flatCoordinates, offset, coordinatess, stride, opt_ends) {\n  const ends = opt_ends ? opt_ends : [];\n  let i = 0;\n  for (let j = 0, jj = coordinatess.length; j < jj; ++j) {\n    const end = deflateCoordinates(\n      flatCoordinates, offset, coordinatess[j], stride);\n    ends[i++] = end;\n    offset = end;\n  }\n  ends.length = i;\n  return ends;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<Array<module:ol/coordinate~Coordinate>>>} coordinatesss Coordinatesss.\n * @param {number} stride Stride.\n * @param {Array<Array<number>>=} opt_endss Endss.\n * @return {Array<Array<number>>} Endss.\n */\nexport function deflateMultiCoordinatesArray(flatCoordinates, offset, coordinatesss, stride, opt_endss) {\n  const endss = opt_endss ? opt_endss : [];\n  let i = 0;\n  for (let j = 0, jj = coordinatesss.length; j < jj; ++j) {\n    const ends = deflateCoordinatesArray(\n      flatCoordinates, offset, coordinatesss[j], stride, endss[i]);\n    endss[i++] = ends;\n    offset = ends[ends.length - 1];\n  }\n  endss.length = i;\n  return endss;\n}\n","/**\n * @module ol/colorlike\n */\nimport {toString} from './color.js';\n\n\n/**\n * A type accepted by CanvasRenderingContext2D.fillStyle\n * or CanvasRenderingContext2D.strokeStyle.\n * Represents a color, pattern, or gradient. The origin for patterns and\n * gradients as fill style is an increment of 512 css pixels from map coordinate\n * `[0, 0]`. For seamless repeat patterns, width and height of the pattern image\n * must be a factor of two (2, 4, 8, ..., 512).\n *\n * @typedef {string|CanvasPattern|CanvasGradient} ColorLike\n * @api\n */\n\n\n/**\n * @param {module:ol/color~Color|module:ol/colorlike~ColorLike} color Color.\n * @return {module:ol/colorlike~ColorLike} The color as an {@link ol/colorlike~ColorLike}.\n * @api\n */\nexport function asColorLike(color) {\n  if (isColorLike(color)) {\n    return /** @type {string|CanvasPattern|CanvasGradient} */ (color);\n  } else {\n    return toString(/** @type {module:ol/color~Color} */ (color));\n  }\n}\n\n\n/**\n * @param {?} color The value that is potentially an {@link ol/colorlike~ColorLike}.\n * @return {boolean} The color is an {@link ol/colorlike~ColorLike}.\n */\nexport function isColorLike(color) {\n  return (\n    typeof color === 'string' ||\n    color instanceof CanvasPattern ||\n    color instanceof CanvasGradient\n  );\n}\n","/**\n * Default maximum allowed threshold  (in pixels) for reprojection\n * triangulation.\n * @type {number}\n */\nexport const ERROR_THRESHOLD = 0.5;\n\n/**\n * Enable automatic reprojection of raster sources. Default is `true`.\n * TODO: decide if we want to expose this as a build flag or remove it\n * @type {boolean}\n */\nexport const ENABLE_RASTER_REPROJECTION = true;\n","/**\n * @module ol/render/EventType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  /**\n   * @event module:ol/render/Event~RenderEvent#postcompose\n   * @api\n   */\n  POSTCOMPOSE: 'postcompose',\n  /**\n   * @event module:ol/render/Event~RenderEvent#precompose\n   * @api\n   */\n  PRECOMPOSE: 'precompose',\n  /**\n   * @event module:ol/render/Event~RenderEvent#render\n   * @api\n   */\n  RENDER: 'render',\n  /**\n   * Triggered when rendering is complete, i.e. all sources and tiles have\n   * finished loading for the current viewport, and all tiles are faded in.\n   * @event module:ol/render/Event~RenderEvent#rendercomplete\n   * @api\n   */\n  RENDERCOMPLETE: 'rendercomplete'\n};\n","/**\n * @module ol/geom/LinearRing\n */\nimport {closestSquaredDistanceXY} from '../extent.js';\nimport GeometryLayout from '../geom/GeometryLayout.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport SimpleGeometry from '../geom/SimpleGeometry.js';\nimport {linearRing as linearRingArea} from '../geom/flat/area.js';\nimport {assignClosestPoint, maxSquaredDelta} from '../geom/flat/closest.js';\nimport {deflateCoordinates} from '../geom/flat/deflate.js';\nimport {inflateCoordinates} from '../geom/flat/inflate.js';\nimport {douglasPeucker} from '../geom/flat/simplify.js';\n\n/**\n * @classdesc\n * Linear ring geometry. Only used as part of polygon; cannot be rendered\n * on its own.\n *\n * @api\n */\nclass LinearRing extends SimpleGeometry {\n\n  /**\n   * @param {Array<module:ol/coordinate~Coordinate>|Array<number>} coordinates Coordinates.\n   *     For internal use, flat coordinates in combination with `opt_layout` are also accepted.\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   */\n  constructor(coordinates, opt_layout) {\n\n    super();\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDelta_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDeltaRevision_ = -1;\n\n    if (opt_layout !== undefined && !Array.isArray(coordinates[0])) {\n      this.setFlatCoordinates(opt_layout, coordinates);\n    } else {\n      this.setCoordinates(coordinates, opt_layout);\n    }\n\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!module:ol/geom/LinearRing} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    return new LinearRing(this.flatCoordinates.slice(), this.layout);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    if (this.maxDeltaRevision_ != this.getRevision()) {\n      this.maxDelta_ = Math.sqrt(maxSquaredDelta(\n        this.flatCoordinates, 0, this.flatCoordinates.length, this.stride, 0));\n      this.maxDeltaRevision_ = this.getRevision();\n    }\n    return assignClosestPoint(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,\n      this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);\n  }\n\n  /**\n   * Return the area of the linear ring on projected plane.\n   * @return {number} Area (on projected plane).\n   * @api\n   */\n  getArea() {\n    return linearRingArea(this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);\n  }\n\n  /**\n   * Return the coordinates of the linear ring.\n   * @return {Array<module:ol/coordinate~Coordinate>} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates() {\n    return inflateCoordinates(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometryInternal(squaredTolerance) {\n    const simplifiedFlatCoordinates = [];\n    simplifiedFlatCoordinates.length = douglasPeucker(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,\n      squaredTolerance, simplifiedFlatCoordinates, 0);\n    return new LinearRing(simplifiedFlatCoordinates, GeometryLayout.XY);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.LINEAR_RING;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  intersectsExtent(extent) {}\n\n  /**\n   * Set the coordinates of the linear ring.\n   * @param {!Array<module:ol/coordinate~Coordinate>} coordinates Coordinates.\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   * @override\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 1);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    this.flatCoordinates.length = deflateCoordinates(\n      this.flatCoordinates, 0, coordinates, this.stride);\n    this.changed();\n  }\n}\n\n\nexport default LinearRing;\n","/**\n * @module ol/geom/Polygon\n */\nimport {extend} from '../array.js';\nimport {closestSquaredDistanceXY, getCenter} from '../extent.js';\nimport GeometryLayout from '../geom/GeometryLayout.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport LinearRing from '../geom/LinearRing.js';\nimport Point from '../geom/Point.js';\nimport SimpleGeometry from '../geom/SimpleGeometry.js';\nimport {offset as sphereOffset} from '../sphere.js';\nimport {linearRings as linearRingsArea} from '../geom/flat/area.js';\nimport {assignClosestArrayPoint, arrayMaxSquaredDelta} from '../geom/flat/closest.js';\nimport {linearRingsContainsXY} from '../geom/flat/contains.js';\nimport {deflateCoordinatesArray} from '../geom/flat/deflate.js';\nimport {inflateCoordinatesArray} from '../geom/flat/inflate.js';\nimport {getInteriorPointOfArray} from '../geom/flat/interiorpoint.js';\nimport {intersectsLinearRingArray} from '../geom/flat/intersectsextent.js';\nimport {linearRingIsOriented, orientLinearRings} from '../geom/flat/orient.js';\nimport {quantizeArray} from '../geom/flat/simplify.js';\nimport {modulo} from '../math.js';\n\n/**\n * @classdesc\n * Polygon geometry.\n *\n * @api\n */\nclass Polygon extends SimpleGeometry {\n\n  /**\n   * @param {!Array<Array<module:ol/coordinate~Coordinate>>|!Array<number>} coordinates\n   *     Array of linear rings that define the polygon. The first linear ring of the\n   *     array defines the outer-boundary or surface of the polygon. Each subsequent\n   *     linear ring defines a hole in the surface of the polygon. A linear ring is\n   *     an array of vertices' coordinates where the first coordinate and the last are\n   *     equivalent. (For internal use, flat coordinates in combination with\n   *     `opt_layout` and `opt_ends` are also accepted.)\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   * @param {Array<number>=} opt_ends Ends (for internal use with flat coordinates).\n   */\n  constructor(coordinates, opt_layout, opt_ends) {\n\n    super();\n\n    /**\n     * @type {Array<number>}\n     * @private\n     */\n    this.ends_ = [];\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.flatInteriorPointRevision_ = -1;\n\n    /**\n     * @private\n     * @type {module:ol/coordinate~Coordinate}\n     */\n    this.flatInteriorPoint_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDelta_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDeltaRevision_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.orientedRevision_ = -1;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.orientedFlatCoordinates_ = null;\n\n    if (opt_layout !== undefined && opt_ends) {\n      this.setFlatCoordinates(opt_layout, coordinates);\n      this.ends_ = opt_ends;\n    } else {\n      this.setCoordinates(coordinates, opt_layout);\n    }\n\n  }\n\n  /**\n   * Append the passed linear ring to this polygon.\n   * @param {module:ol/geom/LinearRing} linearRing Linear ring.\n   * @api\n   */\n  appendLinearRing(linearRing) {\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = linearRing.getFlatCoordinates().slice();\n    } else {\n      extend(this.flatCoordinates, linearRing.getFlatCoordinates());\n    }\n    this.ends_.push(this.flatCoordinates.length);\n    this.changed();\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!module:ol/geom/Polygon} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    return new Polygon(this.flatCoordinates.slice(), this.layout, this.ends_.slice());\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    if (this.maxDeltaRevision_ != this.getRevision()) {\n      this.maxDelta_ = Math.sqrt(arrayMaxSquaredDelta(\n        this.flatCoordinates, 0, this.ends_, this.stride, 0));\n      this.maxDeltaRevision_ = this.getRevision();\n    }\n    return assignClosestArrayPoint(\n      this.flatCoordinates, 0, this.ends_, this.stride,\n      this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  containsXY(x, y) {\n    return linearRingsContainsXY(this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride, x, y);\n  }\n\n  /**\n   * Return the area of the polygon on projected plane.\n   * @return {number} Area (on projected plane).\n   * @api\n   */\n  getArea() {\n    return linearRingsArea(this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride);\n  }\n\n  /**\n   * Get the coordinate array for this geometry.  This array has the structure\n   * of a GeoJSON coordinate array for polygons.\n   *\n   * @param {boolean=} opt_right Orient coordinates according to the right-hand\n   *     rule (counter-clockwise for exterior and clockwise for interior rings).\n   *     If `false`, coordinates will be oriented according to the left-hand rule\n   *     (clockwise for exterior and counter-clockwise for interior rings).\n   *     By default, coordinate orientation will depend on how the geometry was\n   *     constructed.\n   * @return {Array<Array<module:ol/coordinate~Coordinate>>} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates(opt_right) {\n    let flatCoordinates;\n    if (opt_right !== undefined) {\n      flatCoordinates = this.getOrientedFlatCoordinates().slice();\n      orientLinearRings(\n        flatCoordinates, 0, this.ends_, this.stride, opt_right);\n    } else {\n      flatCoordinates = this.flatCoordinates;\n    }\n\n    return inflateCoordinatesArray(\n      flatCoordinates, 0, this.ends_, this.stride);\n  }\n\n  /**\n   * @return {Array<number>} Ends.\n   */\n  getEnds() {\n    return this.ends_;\n  }\n\n  /**\n   * @return {Array<number>} Interior point.\n   */\n  getFlatInteriorPoint() {\n    if (this.flatInteriorPointRevision_ != this.getRevision()) {\n      const flatCenter = getCenter(this.getExtent());\n      this.flatInteriorPoint_ = getInteriorPointOfArray(\n        this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride,\n        flatCenter, 0);\n      this.flatInteriorPointRevision_ = this.getRevision();\n    }\n    return this.flatInteriorPoint_;\n  }\n\n  /**\n   * Return an interior point of the polygon.\n   * @return {module:ol/geom/Point} Interior point as XYM coordinate, where M is the\n   * length of the horizontal intersection that the point belongs to.\n   * @api\n   */\n  getInteriorPoint() {\n    return new Point(this.getFlatInteriorPoint(), GeometryLayout.XYM);\n  }\n\n  /**\n   * Return the number of rings of the polygon,  this includes the exterior\n   * ring and any interior rings.\n   *\n   * @return {number} Number of rings.\n   * @api\n   */\n  getLinearRingCount() {\n    return this.ends_.length;\n  }\n\n  /**\n   * Return the Nth linear ring of the polygon geometry. Return `null` if the\n   * given index is out of range.\n   * The exterior linear ring is available at index `0` and the interior rings\n   * at index `1` and beyond.\n   *\n   * @param {number} index Index.\n   * @return {module:ol/geom/LinearRing} Linear ring.\n   * @api\n   */\n  getLinearRing(index) {\n    if (index < 0 || this.ends_.length <= index) {\n      return null;\n    }\n    return new LinearRing(this.flatCoordinates.slice(\n      index === 0 ? 0 : this.ends_[index - 1], this.ends_[index]), this.layout);\n  }\n\n  /**\n   * Return the linear rings of the polygon.\n   * @return {Array<module:ol/geom/LinearRing>} Linear rings.\n   * @api\n   */\n  getLinearRings() {\n    const layout = this.layout;\n    const flatCoordinates = this.flatCoordinates;\n    const ends = this.ends_;\n    const linearRings = [];\n    let offset = 0;\n    for (let i = 0, ii = ends.length; i < ii; ++i) {\n      const end = ends[i];\n      const linearRing = new LinearRing(flatCoordinates.slice(offset, end), layout);\n      linearRings.push(linearRing);\n      offset = end;\n    }\n    return linearRings;\n  }\n\n  /**\n   * @return {Array<number>} Oriented flat coordinates.\n   */\n  getOrientedFlatCoordinates() {\n    if (this.orientedRevision_ != this.getRevision()) {\n      const flatCoordinates = this.flatCoordinates;\n      if (linearRingIsOriented(\n        flatCoordinates, 0, this.ends_, this.stride)) {\n        this.orientedFlatCoordinates_ = flatCoordinates;\n      } else {\n        this.orientedFlatCoordinates_ = flatCoordinates.slice();\n        this.orientedFlatCoordinates_.length =\n            orientLinearRings(\n              this.orientedFlatCoordinates_, 0, this.ends_, this.stride);\n      }\n      this.orientedRevision_ = this.getRevision();\n    }\n    return this.orientedFlatCoordinates_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometryInternal(squaredTolerance) {\n    const simplifiedFlatCoordinates = [];\n    const simplifiedEnds = [];\n    simplifiedFlatCoordinates.length = quantizeArray(\n      this.flatCoordinates, 0, this.ends_, this.stride,\n      Math.sqrt(squaredTolerance),\n      simplifiedFlatCoordinates, 0, simplifiedEnds);\n    return new Polygon(simplifiedFlatCoordinates, GeometryLayout.XY, simplifiedEnds);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.POLYGON;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    return intersectsLinearRingArray(\n      this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride, extent);\n  }\n\n  /**\n   * Set the coordinates of the polygon.\n   * @param {!Array<Array<module:ol/coordinate~Coordinate>>} coordinates Coordinates.\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   * @override\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 2);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    const ends = deflateCoordinatesArray(\n      this.flatCoordinates, 0, coordinates, this.stride, this.ends_);\n    this.flatCoordinates.length = ends.length === 0 ? 0 : ends[ends.length - 1];\n    this.changed();\n  }\n}\n\n\nexport default Polygon;\n\n\n/**\n * Create an approximation of a circle on the surface of a sphere.\n * @param {module:ol/coordinate~Coordinate} center Center (`[lon, lat]` in degrees).\n * @param {number} radius The great-circle distance from the center to\n *     the polygon vertices.\n * @param {number=} opt_n Optional number of vertices for the resulting\n *     polygon. Default is `32`.\n * @param {number=} opt_sphereRadius Optional radius for the sphere (defaults to\n *     the Earth's mean radius using the WGS84 ellipsoid).\n * @return {module:ol/geom/Polygon} The \"circular\" polygon.\n * @api\n */\nexport function circular(center, radius, opt_n, opt_sphereRadius) {\n  const n = opt_n ? opt_n : 32;\n  /** @type {Array<number>} */\n  const flatCoordinates = [];\n  for (let i = 0; i < n; ++i) {\n    extend(flatCoordinates, sphereOffset(center, radius, 2 * Math.PI * i / n, opt_sphereRadius));\n  }\n  flatCoordinates.push(flatCoordinates[0], flatCoordinates[1]);\n  return new Polygon(flatCoordinates, GeometryLayout.XY, [flatCoordinates.length]);\n}\n\n\n/**\n * Create a polygon from an extent. The layout used is `XY`.\n * @param {module:ol/extent~Extent} extent The extent.\n * @return {module:ol/geom/Polygon} The polygon.\n * @api\n */\nexport function fromExtent(extent) {\n  const minX = extent[0];\n  const minY = extent[1];\n  const maxX = extent[2];\n  const maxY = extent[3];\n  const flatCoordinates =\n      [minX, minY, minX, maxY, maxX, maxY, maxX, minY, minX, minY];\n  return new Polygon(flatCoordinates, GeometryLayout.XY, [flatCoordinates.length]);\n}\n\n\n/**\n * Create a regular polygon from a circle.\n * @param {module:ol/geom/Circle} circle Circle geometry.\n * @param {number=} opt_sides Number of sides of the polygon. Default is 32.\n * @param {number=} opt_angle Start angle for the first vertex of the polygon in\n *     radians. Default is 0.\n * @return {module:ol/geom/Polygon} Polygon geometry.\n * @api\n */\nexport function fromCircle(circle, opt_sides, opt_angle) {\n  const sides = opt_sides ? opt_sides : 32;\n  const stride = circle.getStride();\n  const layout = circle.getLayout();\n  const center = circle.getCenter();\n  const arrayLength = stride * (sides + 1);\n  const flatCoordinates = new Array(arrayLength);\n  for (let i = 0; i < arrayLength; i += stride) {\n    flatCoordinates[i] = 0;\n    flatCoordinates[i + 1] = 0;\n    for (let j = 2; j < stride; j++) {\n      flatCoordinates[i + j] = center[j];\n    }\n  }\n  const ends = [flatCoordinates.length];\n  const polygon = new Polygon(flatCoordinates, layout, ends);\n  makeRegular(polygon, center, circle.getRadius(), opt_angle);\n  return polygon;\n}\n\n\n/**\n * Modify the coordinates of a polygon to make it a regular polygon.\n * @param {module:ol/geom/Polygon} polygon Polygon geometry.\n * @param {module:ol/coordinate~Coordinate} center Center of the regular polygon.\n * @param {number} radius Radius of the regular polygon.\n * @param {number=} opt_angle Start angle for the first vertex of the polygon in\n *     radians. Default is 0.\n */\nexport function makeRegular(polygon, center, radius, opt_angle) {\n  const flatCoordinates = polygon.getFlatCoordinates();\n  const stride = polygon.getStride();\n  const sides = flatCoordinates.length / stride - 1;\n  const startAngle = opt_angle ? opt_angle : 0;\n  for (let i = 0; i <= sides; ++i) {\n    const offset = i * stride;\n    const angle = startAngle + (modulo(i, sides) * 2 * Math.PI / sides);\n    flatCoordinates[offset] = center[0] + (radius * Math.cos(angle));\n    flatCoordinates[offset + 1] = center[1] + (radius * Math.sin(angle));\n  }\n  polygon.changed();\n}\n","/**\n * @module ol/style/Style\n */\n\n/**\n * Feature styles.\n *\n * If no style is defined, the following default style is used:\n * ```js\n *  import {Fill, Stroke, Circle, Style} from 'ol/style';\n *\n *  var fill = new Fill({\n *    color: 'rgba(255,255,255,0.4)'\n *  });\n *  var stroke = new Stroke({\n *    color: '#3399CC',\n *    width: 1.25\n *  });\n *  var styles = [\n *    new Style({\n *      image: new Circle({\n *        fill: fill,\n *        stroke: stroke,\n *        radius: 5\n *      }),\n *      fill: fill,\n *      stroke: stroke\n *    })\n *  ];\n * ```\n *\n * A separate editing style has the following defaults:\n * ```js\n *  import {Fill, Stroke, Circle, Style} from 'ol/style';\n *  import GeometryType from 'ol/geom/GeometryType';\n *\n *  var white = [255, 255, 255, 1];\n *  var blue = [0, 153, 255, 1];\n *  var width = 3;\n *  styles[GeometryType.POLYGON] = [\n *    new Style({\n *      fill: new Fill({\n *        color: [255, 255, 255, 0.5]\n *      })\n *    })\n *  ];\n *  styles[GeometryType.MULTI_POLYGON] =\n *      styles[GeometryType.POLYGON];\n *  styles[GeometryType.LINE_STRING] = [\n *    new Style({\n *      stroke: new Stroke({\n *        color: white,\n *        width: width + 2\n *      })\n *    }),\n *    new Style({\n *      stroke: new Stroke({\n *        color: blue,\n *        width: width\n *      })\n *    })\n *  ];\n *  styles[GeometryType.MULTI_LINE_STRING] =\n *      styles[GeometryType.LINE_STRING];\n *  styles[GeometryType.POINT] = [\n *    new Style({\n *      image: new Circle({\n *        radius: width * 2,\n *        fill: new Fill({\n *          color: blue\n *        }),\n *        stroke: new Stroke({\n *          color: white,\n *          width: width / 2\n *        })\n *      }),\n *      zIndex: Infinity\n *    })\n *  ];\n *  styles[GeometryType.MULTI_POINT] =\n *      styles[GeometryType.POINT];\n *  styles[GeometryType.GEOMETRY_COLLECTION] =\n *      styles[GeometryType.POLYGON].concat(\n *          styles[GeometryType.LINE_STRING],\n *          styles[GeometryType.POINT]\n *      );\n * ```\n */\nimport {assert} from '../asserts.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport CircleStyle from '../style/Circle.js';\nimport Fill from '../style/Fill.js';\nimport Stroke from '../style/Stroke.js';\n\n\n/**\n * A function that takes an {@link module:ol/Feature} and a `{number}`\n * representing the view's resolution. The function should return a\n * {@link module:ol/style/Style} or an array of them. This way e.g. a\n * vector layer can be styled.\n *\n * @typedef {function((module:ol/Feature|module:ol/render/Feature), number):\n *     (module:ol/style/Style|Array<module:ol/style/Style>)} StyleFunction\n */\n\n\n/**\n * A function that takes an {@link module:ol/Feature} as argument and returns an\n * {@link module:ol/geom/Geometry} that will be rendered and styled for the feature.\n *\n * @typedef {function((module:ol/Feature|module:ol/render/Feature)):\n *     (module:ol/geom/Geometry|module:ol/render/Feature|undefined)} GeometryFunction\n */\n\n\n/**\n * Custom renderer function. Takes two arguments:\n *\n * 1. The pixel coordinates of the geometry in GeoJSON notation.\n * 2. The {@link module:ol/render~State} of the layer renderer.\n *\n * @typedef {function((module:ol/coordinate~Coordinate|Array<module:ol/coordinate~Coordinate>|Array<Array<module:ol/coordinate~Coordinate>>),module:ol/render~State)}\n * RenderFunction\n */\n\n\n/**\n * @typedef {Object} Options\n * @property {string|module:ol/geom/Geometry|module:ol/style/Style~GeometryFunction} [geometry] Feature property or geometry\n * or function returning a geometry to render for this style.\n * @property {module:ol/style/Fill} [fill] Fill style.\n * @property {module:ol/style/Image} [image] Image style.\n * @property {module:ol/style/Style~RenderFunction} [renderer] Custom renderer. When configured, `fill`, `stroke` and `image` will be\n * ignored, and the provided function will be called with each render frame for each geometry.\n * @property {module:ol/style/Stroke} [stroke] Stroke style.\n * @property {module:ol/style/Text} [text] Text style.\n * @property {number} [zIndex] Z index.\n */\n\n\n/**\n * @classdesc\n * Container for vector feature rendering styles. Any changes made to the style\n * or its children through `set*()` methods will not take effect until the\n * feature or layer that uses the style is re-rendered.\n * @api\n */\nclass Style {\n  /**\n   * @param {module:ol/style/Style~Options=} opt_options Style options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n\n    /**\n     * @private\n     * @type {string|module:ol/geom/Geometry|module:ol/style/Style~GeometryFunction}\n     */\n    this.geometry_ = null;\n\n    /**\n     * @private\n     * @type {!module:ol/style/Style~GeometryFunction}\n     */\n    this.geometryFunction_ = defaultGeometryFunction;\n\n    if (options.geometry !== undefined) {\n      this.setGeometry(options.geometry);\n    }\n\n    /**\n     * @private\n     * @type {module:ol/style/Fill}\n     */\n    this.fill_ = options.fill !== undefined ? options.fill : null;\n\n    /**\n       * @private\n       * @type {module:ol/style/Image}\n       */\n    this.image_ = options.image !== undefined ? options.image : null;\n\n    /**\n     * @private\n     * @type {module:ol/style/Style~RenderFunction|null}\n     */\n    this.renderer_ = options.renderer !== undefined ? options.renderer : null;\n\n    /**\n     * @private\n     * @type {module:ol/style/Stroke}\n     */\n    this.stroke_ = options.stroke !== undefined ? options.stroke : null;\n\n    /**\n     * @private\n     * @type {module:ol/style/Text}\n     */\n    this.text_ = options.text !== undefined ? options.text : null;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.zIndex_ = options.zIndex;\n\n  }\n\n  /**\n   * Clones the style.\n   * @return {module:ol/style/Style} The cloned style.\n   * @api\n   */\n  clone() {\n    let geometry = this.getGeometry();\n    if (geometry && geometry.clone) {\n      geometry = geometry.clone();\n    }\n    return new Style({\n      geometry: geometry,\n      fill: this.getFill() ? this.getFill().clone() : undefined,\n      image: this.getImage() ? this.getImage().clone() : undefined,\n      stroke: this.getStroke() ? this.getStroke().clone() : undefined,\n      text: this.getText() ? this.getText().clone() : undefined,\n      zIndex: this.getZIndex()\n    });\n  }\n\n  /**\n   * Get the custom renderer function that was configured with\n   * {@link #setRenderer} or the `renderer` constructor option.\n   * @return {module:ol/style/Style~RenderFunction|null} Custom renderer function.\n   * @api\n   */\n  getRenderer() {\n    return this.renderer_;\n  }\n\n  /**\n   * Sets a custom renderer function for this style. When set, `fill`, `stroke`\n   * and `image` options of the style will be ignored.\n   * @param {module:ol/style/Style~RenderFunction|null} renderer Custom renderer function.\n   * @api\n   */\n  setRenderer(renderer) {\n    this.renderer_ = renderer;\n  }\n\n  /**\n   * Get the geometry to be rendered.\n   * @return {string|module:ol/geom/Geometry|module:ol/style/Style~GeometryFunction}\n   * Feature property or geometry or function that returns the geometry that will\n   * be rendered with this style.\n   * @api\n   */\n  getGeometry() {\n    return this.geometry_;\n  }\n\n  /**\n   * Get the function used to generate a geometry for rendering.\n   * @return {!module:ol/style/Style~GeometryFunction} Function that is called with a feature\n   * and returns the geometry to render instead of the feature's geometry.\n   * @api\n   */\n  getGeometryFunction() {\n    return this.geometryFunction_;\n  }\n\n  /**\n   * Get the fill style.\n   * @return {module:ol/style/Fill} Fill style.\n   * @api\n   */\n  getFill() {\n    return this.fill_;\n  }\n\n  /**\n   * Set the fill style.\n   * @param {module:ol/style/Fill} fill Fill style.\n   * @api\n   */\n  setFill(fill) {\n    this.fill_ = fill;\n  }\n\n  /**\n   * Get the image style.\n   * @return {module:ol/style/Image} Image style.\n   * @api\n   */\n  getImage() {\n    return this.image_;\n  }\n\n  /**\n   * Set the image style.\n   * @param {module:ol/style/Image} image Image style.\n   * @api\n   */\n  setImage(image) {\n    this.image_ = image;\n  }\n\n  /**\n   * Get the stroke style.\n   * @return {module:ol/style/Stroke} Stroke style.\n   * @api\n   */\n  getStroke() {\n    return this.stroke_;\n  }\n\n  /**\n   * Set the stroke style.\n   * @param {module:ol/style/Stroke} stroke Stroke style.\n   * @api\n   */\n  setStroke(stroke) {\n    this.stroke_ = stroke;\n  }\n\n  /**\n   * Get the text style.\n   * @return {module:ol/style/Text} Text style.\n   * @api\n   */\n  getText() {\n    return this.text_;\n  }\n\n  /**\n   * Set the text style.\n   * @param {module:ol/style/Text} text Text style.\n   * @api\n   */\n  setText(text) {\n    this.text_ = text;\n  }\n\n  /**\n   * Get the z-index for the style.\n   * @return {number|undefined} ZIndex.\n   * @api\n   */\n  getZIndex() {\n    return this.zIndex_;\n  }\n\n  /**\n   * Set a geometry that is rendered instead of the feature's geometry.\n   *\n   * @param {string|module:ol/geom/Geometry|module:ol/style/Style~GeometryFunction} geometry\n   *     Feature property or geometry or function returning a geometry to render\n   *     for this style.\n   * @api\n   */\n  setGeometry(geometry) {\n    if (typeof geometry === 'function') {\n      this.geometryFunction_ = geometry;\n    } else if (typeof geometry === 'string') {\n      this.geometryFunction_ = function(feature) {\n        return (\n          /** @type {module:ol/geom/Geometry} */ (feature.get(geometry))\n        );\n      };\n    } else if (!geometry) {\n      this.geometryFunction_ = defaultGeometryFunction;\n    } else if (geometry !== undefined) {\n      this.geometryFunction_ = function() {\n        return (\n          /** @type {module:ol/geom/Geometry} */ (geometry)\n        );\n      };\n    }\n    this.geometry_ = geometry;\n  }\n\n  /**\n   * Set the z-index.\n   *\n   * @param {number|undefined} zIndex ZIndex.\n   * @api\n   */\n  setZIndex(zIndex) {\n    this.zIndex_ = zIndex;\n  }\n}\n\n\n/**\n * Convert the provided object into a style function.  Functions passed through\n * unchanged.  Arrays of module:ol/style/Style or single style objects wrapped in a\n * new style function.\n * @param {module:ol/style/Style~StyleFunction|Array<module:ol/style/Style>|module:ol/style/Style} obj\n *     A style function, a single style, or an array of styles.\n * @return {module:ol/style/Style~StyleFunction} A style function.\n */\nexport function toFunction(obj) {\n  let styleFunction;\n\n  if (typeof obj === 'function') {\n    styleFunction = obj;\n  } else {\n    /**\n     * @type {Array<module:ol/style/Style>}\n     */\n    let styles;\n    if (Array.isArray(obj)) {\n      styles = obj;\n    } else {\n      assert(obj instanceof Style,\n        41); // Expected an `module:ol/style/Style~Style` or an array of `module:ol/style/Style~Style`\n      styles = [obj];\n    }\n    styleFunction = function() {\n      return styles;\n    };\n  }\n  return styleFunction;\n}\n\n\n/**\n * @type {Array<module:ol/style/Style>}\n */\nlet defaultStyles = null;\n\n\n/**\n * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n * @param {number} resolution Resolution.\n * @return {Array<module:ol/style/Style>} Style.\n */\nexport function createDefaultStyle(feature, resolution) {\n  // We don't use an immediately-invoked function\n  // and a closure so we don't get an error at script evaluation time in\n  // browsers that do not support Canvas. (module:ol/style/Circle~CircleStyle does\n  // canvas.getContext('2d') at construction time, which will cause an.error\n  // in such browsers.)\n  if (!defaultStyles) {\n    const fill = new Fill({\n      color: 'rgba(255,255,255,0.4)'\n    });\n    const stroke = new Stroke({\n      color: '#3399CC',\n      width: 1.25\n    });\n    defaultStyles = [\n      new Style({\n        image: new CircleStyle({\n          fill: fill,\n          stroke: stroke,\n          radius: 5\n        }),\n        fill: fill,\n        stroke: stroke\n      })\n    ];\n  }\n  return defaultStyles;\n}\n\n\n/**\n * Default styles for editing features.\n * @return {Object<module:ol/geom/GeometryType, Array<module:ol/style/Style>>} Styles\n */\nexport function createEditingStyle() {\n  /** @type {Object<module:ol/geom/GeometryType, Array<module:ol/style/Style>>} */\n  const styles = {};\n  const white = [255, 255, 255, 1];\n  const blue = [0, 153, 255, 1];\n  const width = 3;\n  styles[GeometryType.POLYGON] = [\n    new Style({\n      fill: new Fill({\n        color: [255, 255, 255, 0.5]\n      })\n    })\n  ];\n  styles[GeometryType.MULTI_POLYGON] =\n      styles[GeometryType.POLYGON];\n\n  styles[GeometryType.LINE_STRING] = [\n    new Style({\n      stroke: new Stroke({\n        color: white,\n        width: width + 2\n      })\n    }),\n    new Style({\n      stroke: new Stroke({\n        color: blue,\n        width: width\n      })\n    })\n  ];\n  styles[GeometryType.MULTI_LINE_STRING] =\n      styles[GeometryType.LINE_STRING];\n\n  styles[GeometryType.CIRCLE] =\n      styles[GeometryType.POLYGON].concat(\n        styles[GeometryType.LINE_STRING]\n      );\n\n\n  styles[GeometryType.POINT] = [\n    new Style({\n      image: new CircleStyle({\n        radius: width * 2,\n        fill: new Fill({\n          color: blue\n        }),\n        stroke: new Stroke({\n          color: white,\n          width: width / 2\n        })\n      }),\n      zIndex: Infinity\n    })\n  ];\n  styles[GeometryType.MULTI_POINT] =\n      styles[GeometryType.POINT];\n\n  styles[GeometryType.GEOMETRY_COLLECTION] =\n      styles[GeometryType.POLYGON].concat(\n        styles[GeometryType.LINE_STRING],\n        styles[GeometryType.POINT]\n      );\n\n  return styles;\n}\n\n\n/**\n * Function that is called with a feature and returns its default geometry.\n * @param {module:ol/Feature|module:ol/render/Feature} feature Feature to get the geometry for.\n * @return {module:ol/geom/Geometry|module:ol/render/Feature|undefined} Geometry to render.\n */\nfunction defaultGeometryFunction(feature) {\n  return feature.getGeometry();\n}\n\nexport default Style;\n","/**\n * @module ol/geom/flat/simplify\n */\n// Based on simplify-js https://github.com/mourner/simplify-js\n// Copyright (c) 2012, Vladimir Agafonkin\n// All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are met:\n//\n//    1. Redistributions of source code must retain the above copyright notice,\n//       this list of conditions and the following disclaimer.\n//\n//    2. Redistributions in binary form must reproduce the above copyright\n//       notice, this list of conditions and the following disclaimer in the\n//       documentation and/or other materials provided with the distribution.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\"\n// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\n// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\n// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE\n// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\n// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\n// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\n// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\n// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\n// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\n// POSSIBILITY OF SUCH DAMAGE.\n\nimport {squaredSegmentDistance, squaredDistance} from '../../math.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} squaredTolerance Squared tolerance.\n * @param {boolean} highQuality Highest quality.\n * @param {Array<number>=} opt_simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @return {Array<number>} Simplified line string.\n */\nexport function simplifyLineString(flatCoordinates, offset, end,\n  stride, squaredTolerance, highQuality, opt_simplifiedFlatCoordinates) {\n  const simplifiedFlatCoordinates = opt_simplifiedFlatCoordinates !== undefined ?\n    opt_simplifiedFlatCoordinates : [];\n  if (!highQuality) {\n    end = radialDistance(flatCoordinates, offset, end,\n      stride, squaredTolerance,\n      simplifiedFlatCoordinates, 0);\n    flatCoordinates = simplifiedFlatCoordinates;\n    offset = 0;\n    stride = 2;\n  }\n  simplifiedFlatCoordinates.length = douglasPeucker(\n    flatCoordinates, offset, end, stride, squaredTolerance,\n    simplifiedFlatCoordinates, 0);\n  return simplifiedFlatCoordinates;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} squaredTolerance Squared tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @return {number} Simplified offset.\n */\nexport function douglasPeucker(flatCoordinates, offset, end,\n  stride, squaredTolerance, simplifiedFlatCoordinates, simplifiedOffset) {\n  const n = (end - offset) / stride;\n  if (n < 3) {\n    for (; offset < end; offset += stride) {\n      simplifiedFlatCoordinates[simplifiedOffset++] =\n          flatCoordinates[offset];\n      simplifiedFlatCoordinates[simplifiedOffset++] =\n          flatCoordinates[offset + 1];\n    }\n    return simplifiedOffset;\n  }\n  /** @type {Array<number>} */\n  const markers = new Array(n);\n  markers[0] = 1;\n  markers[n - 1] = 1;\n  /** @type {Array<number>} */\n  const stack = [offset, end - stride];\n  let index = 0;\n  while (stack.length > 0) {\n    const last = stack.pop();\n    const first = stack.pop();\n    let maxSquaredDistance = 0;\n    const x1 = flatCoordinates[first];\n    const y1 = flatCoordinates[first + 1];\n    const x2 = flatCoordinates[last];\n    const y2 = flatCoordinates[last + 1];\n    for (let i = first + stride; i < last; i += stride) {\n      const x = flatCoordinates[i];\n      const y = flatCoordinates[i + 1];\n      const squaredDistance = squaredSegmentDistance(\n        x, y, x1, y1, x2, y2);\n      if (squaredDistance > maxSquaredDistance) {\n        index = i;\n        maxSquaredDistance = squaredDistance;\n      }\n    }\n    if (maxSquaredDistance > squaredTolerance) {\n      markers[(index - offset) / stride] = 1;\n      if (first + stride < index) {\n        stack.push(first, index);\n      }\n      if (index + stride < last) {\n        stack.push(index, last);\n      }\n    }\n  }\n  for (let i = 0; i < n; ++i) {\n    if (markers[i]) {\n      simplifiedFlatCoordinates[simplifiedOffset++] =\n          flatCoordinates[offset + i * stride];\n      simplifiedFlatCoordinates[simplifiedOffset++] =\n          flatCoordinates[offset + i * stride + 1];\n    }\n  }\n  return simplifiedOffset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {number} squaredTolerance Squared tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @param {Array<number>} simplifiedEnds Simplified ends.\n * @return {number} Simplified offset.\n */\nexport function douglasPeuckerArray(flatCoordinates, offset,\n  ends, stride, squaredTolerance, simplifiedFlatCoordinates,\n  simplifiedOffset, simplifiedEnds) {\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    simplifiedOffset = douglasPeucker(\n      flatCoordinates, offset, end, stride, squaredTolerance,\n      simplifiedFlatCoordinates, simplifiedOffset);\n    simplifiedEnds.push(simplifiedOffset);\n    offset = end;\n  }\n  return simplifiedOffset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {number} squaredTolerance Squared tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @param {Array<Array<number>>} simplifiedEndss Simplified endss.\n * @return {number} Simplified offset.\n */\nexport function douglasPeuckerMultiArray(\n  flatCoordinates, offset, endss, stride, squaredTolerance,\n  simplifiedFlatCoordinates, simplifiedOffset, simplifiedEndss) {\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    const simplifiedEnds = [];\n    simplifiedOffset = douglasPeuckerArray(\n      flatCoordinates, offset, ends, stride, squaredTolerance,\n      simplifiedFlatCoordinates, simplifiedOffset, simplifiedEnds);\n    simplifiedEndss.push(simplifiedEnds);\n    offset = ends[ends.length - 1];\n  }\n  return simplifiedOffset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} squaredTolerance Squared tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @return {number} Simplified offset.\n */\nexport function radialDistance(flatCoordinates, offset, end,\n  stride, squaredTolerance, simplifiedFlatCoordinates, simplifiedOffset) {\n  if (end <= offset + stride) {\n    // zero or one point, no simplification possible, so copy and return\n    for (; offset < end; offset += stride) {\n      simplifiedFlatCoordinates[simplifiedOffset++] = flatCoordinates[offset];\n      simplifiedFlatCoordinates[simplifiedOffset++] =\n          flatCoordinates[offset + 1];\n    }\n    return simplifiedOffset;\n  }\n  let x1 = flatCoordinates[offset];\n  let y1 = flatCoordinates[offset + 1];\n  // copy first point\n  simplifiedFlatCoordinates[simplifiedOffset++] = x1;\n  simplifiedFlatCoordinates[simplifiedOffset++] = y1;\n  let x2 = x1;\n  let y2 = y1;\n  for (offset += stride; offset < end; offset += stride) {\n    x2 = flatCoordinates[offset];\n    y2 = flatCoordinates[offset + 1];\n    if (squaredDistance(x1, y1, x2, y2) > squaredTolerance) {\n      // copy point at offset\n      simplifiedFlatCoordinates[simplifiedOffset++] = x2;\n      simplifiedFlatCoordinates[simplifiedOffset++] = y2;\n      x1 = x2;\n      y1 = y2;\n    }\n  }\n  if (x2 != x1 || y2 != y1) {\n    // copy last point\n    simplifiedFlatCoordinates[simplifiedOffset++] = x2;\n    simplifiedFlatCoordinates[simplifiedOffset++] = y2;\n  }\n  return simplifiedOffset;\n}\n\n\n/**\n * @param {number} value Value.\n * @param {number} tolerance Tolerance.\n * @return {number} Rounded value.\n */\nexport function snap(value, tolerance) {\n  return tolerance * Math.round(value / tolerance);\n}\n\n\n/**\n * Simplifies a line string using an algorithm designed by Tim Schaub.\n * Coordinates are snapped to the nearest value in a virtual grid and\n * consecutive duplicate coordinates are discarded.  This effectively preserves\n * topology as the simplification of any subsection of a line string is\n * independent of the rest of the line string.  This means that, for examples,\n * the common edge between two polygons will be simplified to the same line\n * string independently in both polygons.  This implementation uses a single\n * pass over the coordinates and eliminates intermediate collinear points.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} tolerance Tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @return {number} Simplified offset.\n */\nexport function quantize(flatCoordinates, offset, end, stride,\n  tolerance, simplifiedFlatCoordinates, simplifiedOffset) {\n  // do nothing if the line is empty\n  if (offset == end) {\n    return simplifiedOffset;\n  }\n  // snap the first coordinate (P1)\n  let x1 = snap(flatCoordinates[offset], tolerance);\n  let y1 = snap(flatCoordinates[offset + 1], tolerance);\n  offset += stride;\n  // add the first coordinate to the output\n  simplifiedFlatCoordinates[simplifiedOffset++] = x1;\n  simplifiedFlatCoordinates[simplifiedOffset++] = y1;\n  // find the next coordinate that does not snap to the same value as the first\n  // coordinate (P2)\n  let x2, y2;\n  do {\n    x2 = snap(flatCoordinates[offset], tolerance);\n    y2 = snap(flatCoordinates[offset + 1], tolerance);\n    offset += stride;\n    if (offset == end) {\n      // all coordinates snap to the same value, the line collapses to a point\n      // push the last snapped value anyway to ensure that the output contains\n      // at least two points\n      // FIXME should we really return at least two points anyway?\n      simplifiedFlatCoordinates[simplifiedOffset++] = x2;\n      simplifiedFlatCoordinates[simplifiedOffset++] = y2;\n      return simplifiedOffset;\n    }\n  } while (x2 == x1 && y2 == y1);\n  while (offset < end) {\n    // snap the next coordinate (P3)\n    const x3 = snap(flatCoordinates[offset], tolerance);\n    const y3 = snap(flatCoordinates[offset + 1], tolerance);\n    offset += stride;\n    // skip P3 if it is equal to P2\n    if (x3 == x2 && y3 == y2) {\n      continue;\n    }\n    // calculate the delta between P1 and P2\n    const dx1 = x2 - x1;\n    const dy1 = y2 - y1;\n    // calculate the delta between P3 and P1\n    const dx2 = x3 - x1;\n    const dy2 = y3 - y1;\n    // if P1, P2, and P3 are colinear and P3 is further from P1 than P2 is from\n    // P1 in the same direction then P2 is on the straight line between P1 and\n    // P3\n    if ((dx1 * dy2 == dy1 * dx2) &&\n        ((dx1 < 0 && dx2 < dx1) || dx1 == dx2 || (dx1 > 0 && dx2 > dx1)) &&\n        ((dy1 < 0 && dy2 < dy1) || dy1 == dy2 || (dy1 > 0 && dy2 > dy1))) {\n      // discard P2 and set P2 = P3\n      x2 = x3;\n      y2 = y3;\n      continue;\n    }\n    // either P1, P2, and P3 are not colinear, or they are colinear but P3 is\n    // between P3 and P1 or on the opposite half of the line to P2.  add P2,\n    // and continue with P1 = P2 and P2 = P3\n    simplifiedFlatCoordinates[simplifiedOffset++] = x2;\n    simplifiedFlatCoordinates[simplifiedOffset++] = y2;\n    x1 = x2;\n    y1 = y2;\n    x2 = x3;\n    y2 = y3;\n  }\n  // add the last point (P2)\n  simplifiedFlatCoordinates[simplifiedOffset++] = x2;\n  simplifiedFlatCoordinates[simplifiedOffset++] = y2;\n  return simplifiedOffset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {number} tolerance Tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @param {Array<number>} simplifiedEnds Simplified ends.\n * @return {number} Simplified offset.\n */\nexport function quantizeArray(\n  flatCoordinates, offset, ends, stride,\n  tolerance,\n  simplifiedFlatCoordinates, simplifiedOffset, simplifiedEnds) {\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    simplifiedOffset = quantize(\n      flatCoordinates, offset, end, stride,\n      tolerance,\n      simplifiedFlatCoordinates, simplifiedOffset);\n    simplifiedEnds.push(simplifiedOffset);\n    offset = end;\n  }\n  return simplifiedOffset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {number} tolerance Tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @param {Array<Array<number>>} simplifiedEndss Simplified endss.\n * @return {number} Simplified offset.\n */\nexport function quantizeMultiArray(\n  flatCoordinates, offset, endss, stride,\n  tolerance,\n  simplifiedFlatCoordinates, simplifiedOffset, simplifiedEndss) {\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    const simplifiedEnds = [];\n    simplifiedOffset = quantizeArray(\n      flatCoordinates, offset, ends, stride,\n      tolerance,\n      simplifiedFlatCoordinates, simplifiedOffset, simplifiedEnds);\n    simplifiedEndss.push(simplifiedEnds);\n    offset = ends[ends.length - 1];\n  }\n  return simplifiedOffset;\n}\n","/**\n * @module ol/tilecoord\n */\n\n\n/**\n * An array of three numbers representing the location of a tile in a tile\n * grid. The order is `z`, `x`, and `y`. `z` is the zoom level.\n * @typedef {Array<number>} TileCoord\n * @api\n */\n\n\n/**\n * @param {number} z Z.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {module:ol/tilecoord~TileCoord=} opt_tileCoord Tile coordinate.\n * @return {module:ol/tilecoord~TileCoord} Tile coordinate.\n */\nexport function createOrUpdate(z, x, y, opt_tileCoord) {\n  if (opt_tileCoord !== undefined) {\n    opt_tileCoord[0] = z;\n    opt_tileCoord[1] = x;\n    opt_tileCoord[2] = y;\n    return opt_tileCoord;\n  } else {\n    return [z, x, y];\n  }\n}\n\n\n/**\n * @param {number} z Z.\n * @param {number} x X.\n * @param {number} y Y.\n * @return {string} Key.\n */\nexport function getKeyZXY(z, x, y) {\n  return z + '/' + x + '/' + y;\n}\n\n\n/**\n * Get the key for a tile coord.\n * @param {module:ol/tilecoord~TileCoord} tileCoord The tile coord.\n * @return {string} Key.\n */\nexport function getKey(tileCoord) {\n  return getKeyZXY(tileCoord[0], tileCoord[1], tileCoord[2]);\n}\n\n\n/**\n * Get a tile coord given a key.\n * @param {string} key The tile coord key.\n * @return {module:ol/tilecoord~TileCoord} The tile coord.\n */\nexport function fromKey(key) {\n  return key.split('/').map(Number);\n}\n\n\n/**\n * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coord.\n * @return {number} Hash.\n */\nexport function hash(tileCoord) {\n  return (tileCoord[1] << tileCoord[0]) + tileCoord[2];\n}\n\n\n/**\n * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coord.\n * @return {string} Quad key.\n */\nexport function quadKey(tileCoord) {\n  const z = tileCoord[0];\n  const digits = new Array(z);\n  let mask = 1 << (z - 1);\n  let i, charCode;\n  for (i = 0; i < z; ++i) {\n    // 48 is charCode for 0 - '0'.charCodeAt(0)\n    charCode = 48;\n    if (tileCoord[1] & mask) {\n      charCode += 1;\n    }\n    if (tileCoord[2] & mask) {\n      charCode += 2;\n    }\n    digits[i] = String.fromCharCode(charCode);\n    mask >>= 1;\n  }\n  return digits.join('');\n}\n\n\n/**\n * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n * @param {!module:ol/tilegrid/TileGrid} tileGrid Tile grid.\n * @return {boolean} Tile coordinate is within extent and zoom level range.\n */\nexport function withinExtentAndZ(tileCoord, tileGrid) {\n  const z = tileCoord[0];\n  const x = tileCoord[1];\n  const y = tileCoord[2];\n\n  if (tileGrid.getMinZoom() > z || z > tileGrid.getMaxZoom()) {\n    return false;\n  }\n  const extent = tileGrid.getExtent();\n  let tileRange;\n  if (!extent) {\n    tileRange = tileGrid.getFullTileRange(z);\n  } else {\n    tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);\n  }\n  if (!tileRange) {\n    return true;\n  } else {\n    return tileRange.containsXY(x, y);\n  }\n}\n","/**\n * @module ol/tilegrid/TileGrid\n */\nimport {DEFAULT_TILE_SIZE} from './common.js';\nimport {assert} from '../asserts.js';\nimport TileRange, {createOrUpdate as createOrUpdateTileRange} from '../TileRange.js';\nimport {isSorted, linearFindNearest} from '../array.js';\nimport {createOrUpdate, getTopLeft} from '../extent.js';\nimport {clamp} from '../math.js';\nimport {toSize} from '../size.js';\nimport {createOrUpdate as createOrUpdateTileCoord} from '../tilecoord.js';\n\n\n/**\n * @private\n * @type {module:ol/tilecoord~TileCoord}\n */\nconst tmpTileCoord = [0, 0, 0];\n\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/extent~Extent} [extent] Extent for the tile grid. No tiles outside this\n * extent will be requested by {@link module:ol/source/Tile} sources. When no `origin` or\n * `origins` are configured, the `origin` will be set to the top-left corner of the extent.\n * @property {number} [minZoom=0] Minimum zoom.\n * @property {module:ol/coordinate~Coordinate} [origin] The tile grid origin, i.e. where the `x`\n * and `y` axes meet (`[z, 0, 0]`). Tile coordinates increase left to right and upwards. If not\n * specified, `extent` or `origins` must be provided.\n * @property {Array<module:ol/coordinate~Coordinate>} [origins] Tile grid origins, i.e. where\n * the `x` and `y` axes meet (`[z, 0, 0]`), for each zoom level. If given, the array length\n * should match the length of the `resolutions` array, i.e. each resolution can have a different\n * origin. Tile coordinates increase left to right and upwards. If not specified, `extent` or\n * `origin` must be provided.\n * @property {!Array<number>} resolutions Resolutions. The array index of each resolution needs\n * to match the zoom level. This means that even if a `minZoom` is configured, the resolutions\n * array will have a length of `maxZoom + 1`.\n * @property {Array<module:ol/size~Size>} [sizes] Sizes.\n * @property {number|module:ol/size~Size} [tileSize] Tile size.\n * Default is `[256, 256]`.\n * @property {Array<module:ol/size~Size>} [tileSizes] Tile sizes. If given, the array length\n * should match the length of the `resolutions` array, i.e. each resolution can have a different\n * tile size.\n */\n\n\n/**\n * @classdesc\n * Base class for setting the grid pattern for sources accessing tiled-image\n * servers.\n * @api\n */\nclass TileGrid {\n  /**\n   * @param {module:ol/tilegrid/TileGrid~Options} options Tile grid options.\n   */\n  constructor(options) {\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.minZoom = options.minZoom !== undefined ? options.minZoom : 0;\n\n    /**\n     * @private\n     * @type {!Array<number>}\n     */\n    this.resolutions_ = options.resolutions;\n    assert(isSorted(this.resolutions_, function(a, b) {\n      return b - a;\n    }, true), 17); // `resolutions` must be sorted in descending order\n\n\n    // check if we've got a consistent zoom factor and origin\n    let zoomFactor;\n    if (!options.origins) {\n      for (let i = 0, ii = this.resolutions_.length - 1; i < ii; ++i) {\n        if (!zoomFactor) {\n          zoomFactor = this.resolutions_[i] / this.resolutions_[i + 1];\n        } else {\n          if (this.resolutions_[i] / this.resolutions_[i + 1] !== zoomFactor) {\n            zoomFactor = undefined;\n            break;\n          }\n        }\n      }\n    }\n\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.zoomFactor_ = zoomFactor;\n\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.maxZoom = this.resolutions_.length - 1;\n\n    /**\n     * @private\n     * @type {module:ol/coordinate~Coordinate}\n     */\n    this.origin_ = options.origin !== undefined ? options.origin : null;\n\n    /**\n     * @private\n     * @type {Array<module:ol/coordinate~Coordinate>}\n     */\n    this.origins_ = null;\n    if (options.origins !== undefined) {\n      this.origins_ = options.origins;\n      assert(this.origins_.length == this.resolutions_.length,\n        20); // Number of `origins` and `resolutions` must be equal\n    }\n\n    const extent = options.extent;\n\n    if (extent !== undefined &&\n        !this.origin_ && !this.origins_) {\n      this.origin_ = getTopLeft(extent);\n    }\n\n    assert(\n      (!this.origin_ && this.origins_) || (this.origin_ && !this.origins_),\n      18); // Either `origin` or `origins` must be configured, never both\n\n    /**\n     * @private\n     * @type {Array<number|module:ol/size~Size>}\n     */\n    this.tileSizes_ = null;\n    if (options.tileSizes !== undefined) {\n      this.tileSizes_ = options.tileSizes;\n      assert(this.tileSizes_.length == this.resolutions_.length,\n        19); // Number of `tileSizes` and `resolutions` must be equal\n    }\n\n    /**\n     * @private\n     * @type {number|module:ol/size~Size}\n     */\n    this.tileSize_ = options.tileSize !== undefined ?\n      options.tileSize :\n      !this.tileSizes_ ? DEFAULT_TILE_SIZE : null;\n    assert(\n      (!this.tileSize_ && this.tileSizes_) ||\n        (this.tileSize_ && !this.tileSizes_),\n      22); // Either `tileSize` or `tileSizes` must be configured, never both\n\n    /**\n     * @private\n     * @type {module:ol/extent~Extent}\n     */\n    this.extent_ = extent !== undefined ? extent : null;\n\n\n    /**\n     * @private\n     * @type {Array<module:ol/TileRange>}\n     */\n    this.fullTileRanges_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/size~Size}\n     */\n    this.tmpSize_ = [0, 0];\n\n    if (options.sizes !== undefined) {\n      this.fullTileRanges_ = options.sizes.map(function(size, z) {\n        const tileRange = new TileRange(\n          Math.min(0, size[0]), Math.max(size[0] - 1, -1),\n          Math.min(0, size[1]), Math.max(size[1] - 1, -1));\n        return tileRange;\n      }, this);\n    } else if (extent) {\n      this.calculateTileRanges_(extent);\n    }\n\n  }\n\n  /**\n   * Call a function with each tile coordinate for a given extent and zoom level.\n   *\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {number} zoom Integer zoom level.\n   * @param {function(module:ol/tilecoord~TileCoord)} callback Function called with each tile coordinate.\n   * @api\n   */\n  forEachTileCoord(extent, zoom, callback) {\n    const tileRange = this.getTileRangeForExtentAndZ(extent, zoom);\n    for (let i = tileRange.minX, ii = tileRange.maxX; i <= ii; ++i) {\n      for (let j = tileRange.minY, jj = tileRange.maxY; j <= jj; ++j) {\n        callback([zoom, i, j]);\n      }\n    }\n  }\n\n  /**\n   * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n   * @param {function(this: T, number, module:ol/TileRange): boolean} callback Callback.\n   * @param {T=} opt_this The object to use as `this` in `callback`.\n   * @param {module:ol/TileRange=} opt_tileRange Temporary module:ol/TileRange object.\n   * @param {module:ol/extent~Extent=} opt_extent Temporary module:ol/extent~Extent object.\n   * @return {boolean} Callback succeeded.\n   * @template T\n   */\n  forEachTileCoordParentTileRange(tileCoord, callback, opt_this, opt_tileRange, opt_extent) {\n    let tileRange, x, y;\n    let tileCoordExtent = null;\n    let z = tileCoord[0] - 1;\n    if (this.zoomFactor_ === 2) {\n      x = tileCoord[1];\n      y = tileCoord[2];\n    } else {\n      tileCoordExtent = this.getTileCoordExtent(tileCoord, opt_extent);\n    }\n    while (z >= this.minZoom) {\n      if (this.zoomFactor_ === 2) {\n        x = Math.floor(x / 2);\n        y = Math.floor(y / 2);\n        tileRange = createOrUpdateTileRange(x, x, y, y, opt_tileRange);\n      } else {\n        tileRange = this.getTileRangeForExtentAndZ(tileCoordExtent, z, opt_tileRange);\n      }\n      if (callback.call(opt_this, z, tileRange)) {\n        return true;\n      }\n      --z;\n    }\n    return false;\n  }\n\n  /**\n   * Get the extent for this tile grid, if it was configured.\n   * @return {module:ol/extent~Extent} Extent.\n   */\n  getExtent() {\n    return this.extent_;\n  }\n\n  /**\n   * Get the maximum zoom level for the grid.\n   * @return {number} Max zoom.\n   * @api\n   */\n  getMaxZoom() {\n    return this.maxZoom;\n  }\n\n  /**\n   * Get the minimum zoom level for the grid.\n   * @return {number} Min zoom.\n   * @api\n   */\n  getMinZoom() {\n    return this.minZoom;\n  }\n\n  /**\n   * Get the origin for the grid at the given zoom level.\n   * @param {number} z Integer zoom level.\n   * @return {module:ol/coordinate~Coordinate} Origin.\n   * @api\n   */\n  getOrigin(z) {\n    if (this.origin_) {\n      return this.origin_;\n    } else {\n      return this.origins_[z];\n    }\n  }\n\n  /**\n   * Get the resolution for the given zoom level.\n   * @param {number} z Integer zoom level.\n   * @return {number} Resolution.\n   * @api\n   */\n  getResolution(z) {\n    return this.resolutions_[z];\n  }\n\n  /**\n   * Get the list of resolutions for the tile grid.\n   * @return {Array<number>} Resolutions.\n   * @api\n   */\n  getResolutions() {\n    return this.resolutions_;\n  }\n\n  /**\n   * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n   * @param {module:ol/TileRange=} opt_tileRange Temporary module:ol/TileRange object.\n   * @param {module:ol/extent~Extent=} opt_extent Temporary module:ol/extent~Extent object.\n   * @return {module:ol/TileRange} Tile range.\n   */\n  getTileCoordChildTileRange(tileCoord, opt_tileRange, opt_extent) {\n    if (tileCoord[0] < this.maxZoom) {\n      if (this.zoomFactor_ === 2) {\n        const minX = tileCoord[1] * 2;\n        const minY = tileCoord[2] * 2;\n        return createOrUpdateTileRange(minX, minX + 1, minY, minY + 1, opt_tileRange);\n      }\n      const tileCoordExtent = this.getTileCoordExtent(tileCoord, opt_extent);\n      return this.getTileRangeForExtentAndZ(\n        tileCoordExtent, tileCoord[0] + 1, opt_tileRange);\n    }\n    return null;\n  }\n\n  /**\n   * Get the extent for a tile range.\n   * @param {number} z Integer zoom level.\n   * @param {module:ol/TileRange} tileRange Tile range.\n   * @param {module:ol/extent~Extent=} opt_extent Temporary module:ol/extent~Extent object.\n   * @return {module:ol/extent~Extent} Extent.\n   */\n  getTileRangeExtent(z, tileRange, opt_extent) {\n    const origin = this.getOrigin(z);\n    const resolution = this.getResolution(z);\n    const tileSize = toSize(this.getTileSize(z), this.tmpSize_);\n    const minX = origin[0] + tileRange.minX * tileSize[0] * resolution;\n    const maxX = origin[0] + (tileRange.maxX + 1) * tileSize[0] * resolution;\n    const minY = origin[1] + tileRange.minY * tileSize[1] * resolution;\n    const maxY = origin[1] + (tileRange.maxY + 1) * tileSize[1] * resolution;\n    return createOrUpdate(minX, minY, maxX, maxY, opt_extent);\n  }\n\n  /**\n   * Get a tile range for the given extent and integer zoom level.\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {number} z Integer zoom level.\n   * @param {module:ol/TileRange=} opt_tileRange Temporary tile range object.\n   * @return {module:ol/TileRange} Tile range.\n   */\n  getTileRangeForExtentAndZ(extent, z, opt_tileRange) {\n    const tileCoord = tmpTileCoord;\n    this.getTileCoordForXYAndZ_(extent[0], extent[1], z, false, tileCoord);\n    const minX = tileCoord[1];\n    const minY = tileCoord[2];\n    this.getTileCoordForXYAndZ_(extent[2], extent[3], z, true, tileCoord);\n    return createOrUpdateTileRange(minX, tileCoord[1], minY, tileCoord[2], opt_tileRange);\n  }\n\n  /**\n   * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n   * @return {module:ol/coordinate~Coordinate} Tile center.\n   */\n  getTileCoordCenter(tileCoord) {\n    const origin = this.getOrigin(tileCoord[0]);\n    const resolution = this.getResolution(tileCoord[0]);\n    const tileSize = toSize(this.getTileSize(tileCoord[0]), this.tmpSize_);\n    return [\n      origin[0] + (tileCoord[1] + 0.5) * tileSize[0] * resolution,\n      origin[1] + (tileCoord[2] + 0.5) * tileSize[1] * resolution\n    ];\n  }\n\n  /**\n   * Get the extent of a tile coordinate.\n   *\n   * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n   * @param {module:ol/extent~Extent=} opt_extent Temporary extent object.\n   * @return {module:ol/extent~Extent} Extent.\n   * @api\n   */\n  getTileCoordExtent(tileCoord, opt_extent) {\n    const origin = this.getOrigin(tileCoord[0]);\n    const resolution = this.getResolution(tileCoord[0]);\n    const tileSize = toSize(this.getTileSize(tileCoord[0]), this.tmpSize_);\n    const minX = origin[0] + tileCoord[1] * tileSize[0] * resolution;\n    const minY = origin[1] + tileCoord[2] * tileSize[1] * resolution;\n    const maxX = minX + tileSize[0] * resolution;\n    const maxY = minY + tileSize[1] * resolution;\n    return createOrUpdate(minX, minY, maxX, maxY, opt_extent);\n  }\n\n  /**\n   * Get the tile coordinate for the given map coordinate and resolution.  This\n   * method considers that coordinates that intersect tile boundaries should be\n   * assigned the higher tile coordinate.\n   *\n   * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n   * @param {number} resolution Resolution.\n   * @param {module:ol/tilecoord~TileCoord=} opt_tileCoord Destination module:ol/tilecoord~TileCoord object.\n   * @return {module:ol/tilecoord~TileCoord} Tile coordinate.\n   * @api\n   */\n  getTileCoordForCoordAndResolution(coordinate, resolution, opt_tileCoord) {\n    return this.getTileCoordForXYAndResolution_(\n      coordinate[0], coordinate[1], resolution, false, opt_tileCoord);\n  }\n\n  /**\n   * Note that this method should not be called for resolutions that correspond\n   * to an integer zoom level.  Instead call the `getTileCoordForXYAndZ_` method.\n   * @param {number} x X.\n   * @param {number} y Y.\n   * @param {number} resolution Resolution (for a non-integer zoom level).\n   * @param {boolean} reverseIntersectionPolicy Instead of letting edge\n   *     intersections go to the higher tile coordinate, let edge intersections\n   *     go to the lower tile coordinate.\n   * @param {module:ol/tilecoord~TileCoord=} opt_tileCoord Temporary module:ol/tilecoord~TileCoord object.\n   * @return {module:ol/tilecoord~TileCoord} Tile coordinate.\n   * @private\n   */\n  getTileCoordForXYAndResolution_(x, y, resolution, reverseIntersectionPolicy, opt_tileCoord) {\n    const z = this.getZForResolution(resolution);\n    const scale = resolution / this.getResolution(z);\n    const origin = this.getOrigin(z);\n    const tileSize = toSize(this.getTileSize(z), this.tmpSize_);\n\n    const adjustX = reverseIntersectionPolicy ? 0.5 : 0;\n    const adjustY = reverseIntersectionPolicy ? 0 : 0.5;\n    const xFromOrigin = Math.floor((x - origin[0]) / resolution + adjustX);\n    const yFromOrigin = Math.floor((y - origin[1]) / resolution + adjustY);\n    let tileCoordX = scale * xFromOrigin / tileSize[0];\n    let tileCoordY = scale * yFromOrigin / tileSize[1];\n\n    if (reverseIntersectionPolicy) {\n      tileCoordX = Math.ceil(tileCoordX) - 1;\n      tileCoordY = Math.ceil(tileCoordY) - 1;\n    } else {\n      tileCoordX = Math.floor(tileCoordX);\n      tileCoordY = Math.floor(tileCoordY);\n    }\n\n    return createOrUpdateTileCoord(z, tileCoordX, tileCoordY, opt_tileCoord);\n  }\n\n  /**\n   * Although there is repetition between this method and `getTileCoordForXYAndResolution_`,\n   * they should have separate implementations.  This method is for integer zoom\n   * levels.  The other method should only be called for resolutions corresponding\n   * to non-integer zoom levels.\n   * @param {number} x Map x coordinate.\n   * @param {number} y Map y coordinate.\n   * @param {number} z Integer zoom level.\n   * @param {boolean} reverseIntersectionPolicy Instead of letting edge\n   *     intersections go to the higher tile coordinate, let edge intersections\n   *     go to the lower tile coordinate.\n   * @param {module:ol/tilecoord~TileCoord=} opt_tileCoord Temporary module:ol/tilecoord~TileCoord object.\n   * @return {module:ol/tilecoord~TileCoord} Tile coordinate.\n   * @private\n   */\n  getTileCoordForXYAndZ_(x, y, z, reverseIntersectionPolicy, opt_tileCoord) {\n    const origin = this.getOrigin(z);\n    const resolution = this.getResolution(z);\n    const tileSize = toSize(this.getTileSize(z), this.tmpSize_);\n\n    const adjustX = reverseIntersectionPolicy ? 0.5 : 0;\n    const adjustY = reverseIntersectionPolicy ? 0 : 0.5;\n    const xFromOrigin = Math.floor((x - origin[0]) / resolution + adjustX);\n    const yFromOrigin = Math.floor((y - origin[1]) / resolution + adjustY);\n    let tileCoordX = xFromOrigin / tileSize[0];\n    let tileCoordY = yFromOrigin / tileSize[1];\n\n    if (reverseIntersectionPolicy) {\n      tileCoordX = Math.ceil(tileCoordX) - 1;\n      tileCoordY = Math.ceil(tileCoordY) - 1;\n    } else {\n      tileCoordX = Math.floor(tileCoordX);\n      tileCoordY = Math.floor(tileCoordY);\n    }\n\n    return createOrUpdateTileCoord(z, tileCoordX, tileCoordY, opt_tileCoord);\n  }\n\n  /**\n   * Get a tile coordinate given a map coordinate and zoom level.\n   * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n   * @param {number} z Zoom level.\n   * @param {module:ol/tilecoord~TileCoord=} opt_tileCoord Destination module:ol/tilecoord~TileCoord object.\n   * @return {module:ol/tilecoord~TileCoord} Tile coordinate.\n   * @api\n   */\n  getTileCoordForCoordAndZ(coordinate, z, opt_tileCoord) {\n    return this.getTileCoordForXYAndZ_(\n      coordinate[0], coordinate[1], z, false, opt_tileCoord);\n  }\n\n  /**\n   * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n   * @return {number} Tile resolution.\n   */\n  getTileCoordResolution(tileCoord) {\n    return this.resolutions_[tileCoord[0]];\n  }\n\n  /**\n   * Get the tile size for a zoom level. The type of the return value matches the\n   * `tileSize` or `tileSizes` that the tile grid was configured with. To always\n   * get an `module:ol/size~Size`, run the result through `module:ol/size~Size.toSize()`.\n   * @param {number} z Z.\n   * @return {number|module:ol/size~Size} Tile size.\n   * @api\n   */\n  getTileSize(z) {\n    if (this.tileSize_) {\n      return this.tileSize_;\n    } else {\n      return this.tileSizes_[z];\n    }\n  }\n\n  /**\n   * @param {number} z Zoom level.\n   * @return {module:ol/TileRange} Extent tile range for the specified zoom level.\n   */\n  getFullTileRange(z) {\n    if (!this.fullTileRanges_) {\n      return null;\n    } else {\n      return this.fullTileRanges_[z];\n    }\n  }\n\n  /**\n   * @param {number} resolution Resolution.\n   * @param {number=} opt_direction If 0, the nearest resolution will be used.\n   *     If 1, the nearest lower resolution will be used. If -1, the nearest\n   *     higher resolution will be used. Default is 0.\n   * @return {number} Z.\n   * @api\n   */\n  getZForResolution(resolution, opt_direction) {\n    const z = linearFindNearest(this.resolutions_, resolution, opt_direction || 0);\n    return clamp(z, this.minZoom, this.maxZoom);\n  }\n\n  /**\n   * @param {!module:ol/extent~Extent} extent Extent for this tile grid.\n   * @private\n   */\n  calculateTileRanges_(extent) {\n    const length = this.resolutions_.length;\n    const fullTileRanges = new Array(length);\n    for (let z = this.minZoom; z < length; ++z) {\n      fullTileRanges[z] = this.getTileRangeForExtentAndZ(extent, z);\n    }\n    this.fullTileRanges_ = fullTileRanges;\n  }\n}\n\n\nexport default TileGrid;\n","/**\n * @module ol/tilegrid\n */\nimport {DEFAULT_MAX_ZOOM, DEFAULT_TILE_SIZE} from './tilegrid/common.js';\nimport {toSize} from './size.js';\nimport {containsCoordinate, createOrUpdate, getCorner, getHeight, getWidth} from './extent.js';\nimport Corner from './extent/Corner.js';\nimport {assign} from './obj.js';\nimport {get as getProjection, METERS_PER_UNIT} from './proj.js';\nimport Units from './proj/Units.js';\nimport TileGrid from './tilegrid/TileGrid.js';\n\n\n/**\n * @param {module:ol/proj/Projection} projection Projection.\n * @return {!module:ol/tilegrid/TileGrid} Default tile grid for the\n * passed projection.\n */\nexport function getForProjection(projection) {\n  let tileGrid = projection.getDefaultTileGrid();\n  if (!tileGrid) {\n    tileGrid = createForProjection(projection);\n    projection.setDefaultTileGrid(tileGrid);\n  }\n  return tileGrid;\n}\n\n\n/**\n * @param {module:ol/tilegrid/TileGrid} tileGrid Tile grid.\n * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n * @param {module:ol/proj/Projection} projection Projection.\n * @return {module:ol/tilecoord~TileCoord} Tile coordinate.\n */\nexport function wrapX(tileGrid, tileCoord, projection) {\n  const z = tileCoord[0];\n  const center = tileGrid.getTileCoordCenter(tileCoord);\n  const projectionExtent = extentFromProjection(projection);\n  if (!containsCoordinate(projectionExtent, center)) {\n    const worldWidth = getWidth(projectionExtent);\n    const worldsAway = Math.ceil((projectionExtent[0] - center[0]) / worldWidth);\n    center[0] += worldWidth * worldsAway;\n    return tileGrid.getTileCoordForCoordAndZ(center, z);\n  } else {\n    return tileCoord;\n  }\n}\n\n\n/**\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {number=} opt_maxZoom Maximum zoom level (default is\n *     DEFAULT_MAX_ZOOM).\n * @param {number|module:ol/size~Size=} opt_tileSize Tile size (default uses\n *     DEFAULT_TILE_SIZE).\n * @param {module:ol/extent/Corner=} opt_corner Extent corner (default is `'top-left'`).\n * @return {!module:ol/tilegrid/TileGrid} TileGrid instance.\n */\nexport function createForExtent(extent, opt_maxZoom, opt_tileSize, opt_corner) {\n  const corner = opt_corner !== undefined ? opt_corner : Corner.TOP_LEFT;\n\n  const resolutions = resolutionsFromExtent(extent, opt_maxZoom, opt_tileSize);\n\n  return new TileGrid({\n    extent: extent,\n    origin: getCorner(extent, corner),\n    resolutions: resolutions,\n    tileSize: opt_tileSize\n  });\n}\n\n\n/**\n * @typedef {Object} XYZOptions\n * @property {module:ol/extent~Extent} [extent] Extent for the tile grid. The origin for an XYZ tile grid is the\n * top-left corner of the extent. The zero level of the grid is defined by the resolution at which one tile fits in the\n * provided extent. If not provided, the extent of the EPSG:3857 projection is used.\n * @property {number} [maxZoom] Maximum zoom. The default is `42`. This determines the number of levels\n * in the grid set. For example, a `maxZoom` of 21 means there are 22 levels in the grid set.\n * @property {number} [minZoom=0] Minimum zoom.\n * @property {number|module:ol/size~Size} [tileSize=[256, 256]] Tile size in pixels.\n */\n\n\n/**\n * Creates a tile grid with a standard XYZ tiling scheme.\n * @param {module:ol/tilegrid~XYZOptions=} opt_options Tile grid options.\n * @return {!module:ol/tilegrid/TileGrid} Tile grid instance.\n * @api\n */\nexport function createXYZ(opt_options) {\n  const options = /** @type {module:ol/tilegrid/TileGrid~Options} */ ({});\n  assign(options, opt_options !== undefined ?\n    opt_options : /** @type {module:ol/tilegrid~XYZOptions} */ ({}));\n  if (options.extent === undefined) {\n    options.extent = getProjection('EPSG:3857').getExtent();\n  }\n  options.resolutions = resolutionsFromExtent(\n    options.extent, options.maxZoom, options.tileSize);\n  delete options.maxZoom;\n\n  return new TileGrid(options);\n}\n\n\n/**\n * Create a resolutions array from an extent.  A zoom factor of 2 is assumed.\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {number=} opt_maxZoom Maximum zoom level (default is\n *     DEFAULT_MAX_ZOOM).\n * @param {number|module:ol/size~Size=} opt_tileSize Tile size (default uses\n *     DEFAULT_TILE_SIZE).\n * @return {!Array<number>} Resolutions array.\n */\nfunction resolutionsFromExtent(extent, opt_maxZoom, opt_tileSize) {\n  const maxZoom = opt_maxZoom !== undefined ?\n    opt_maxZoom : DEFAULT_MAX_ZOOM;\n\n  const height = getHeight(extent);\n  const width = getWidth(extent);\n\n  const tileSize = toSize(opt_tileSize !== undefined ?\n    opt_tileSize : DEFAULT_TILE_SIZE);\n  const maxResolution = Math.max(\n    width / tileSize[0], height / tileSize[1]);\n\n  const length = maxZoom + 1;\n  const resolutions = new Array(length);\n  for (let z = 0; z < length; ++z) {\n    resolutions[z] = maxResolution / Math.pow(2, z);\n  }\n  return resolutions;\n}\n\n\n/**\n * @param {module:ol/proj~ProjectionLike} projection Projection.\n * @param {number=} opt_maxZoom Maximum zoom level (default is\n *     DEFAULT_MAX_ZOOM).\n * @param {number|module:ol/size~Size=} opt_tileSize Tile size (default uses\n *     DEFAULT_TILE_SIZE).\n * @param {module:ol/extent/Corner=} opt_corner Extent corner (default is `'top-left'`).\n * @return {!module:ol/tilegrid/TileGrid} TileGrid instance.\n */\nexport function createForProjection(projection, opt_maxZoom, opt_tileSize, opt_corner) {\n  const extent = extentFromProjection(projection);\n  return createForExtent(extent, opt_maxZoom, opt_tileSize, opt_corner);\n}\n\n\n/**\n * Generate a tile grid extent from a projection.  If the projection has an\n * extent, it is used.  If not, a global extent is assumed.\n * @param {module:ol/proj~ProjectionLike} projection Projection.\n * @return {module:ol/extent~Extent} Extent.\n */\nexport function extentFromProjection(projection) {\n  projection = getProjection(projection);\n  let extent = projection.getExtent();\n  if (!extent) {\n    const half = 180 * METERS_PER_UNIT[Units.DEGREES] / projection.getMetersPerUnit();\n    extent = createOrUpdate(-half, -half, half, half);\n  }\n  return extent;\n}\n","/**\n * @module ol/render/Feature\n */\nimport {VOID} from '../functions.js';\nimport {extend} from '../array.js';\nimport {createOrUpdateFromCoordinate, createOrUpdateFromFlatCoordinates, getCenter, getHeight} from '../extent.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport {linearRingss as linearRingssCenter} from '../geom/flat/center.js';\nimport {getInteriorPointOfArray, getInteriorPointsOfMultiArray} from '../geom/flat/interiorpoint.js';\nimport {interpolatePoint} from '../geom/flat/interpolate.js';\nimport {get as getProjection} from '../proj.js';\nimport {transform2D} from '../geom/flat/transform.js';\nimport {create as createTransform, compose as composeTransform} from '../transform.js';\n\n\n/**\n * @type {module:ol/transform~Transform}\n */\nconst tmpTransform = createTransform();\n\n\n/**\n * Lightweight, read-only, {@link module:ol/Feature~Feature} and {@link module:ol/geom/Geometry~Geometry} like\n * structure, optimized for vector tile rendering and styling. Geometry access\n * through the API is limited to getting the type and extent of the geometry.\n *\n * @param {module:ol/geom/GeometryType} type Geometry type.\n * @param {Array<number>} flatCoordinates Flat coordinates. These always need\n *     to be right-handed for polygons.\n * @param {Array<number>|Array<Array<number>>} ends Ends or Endss.\n * @param {Object<string, *>} properties Properties.\n * @param {number|string|undefined} id Feature id.\n */\nclass RenderFeature {\n  constructor(type, flatCoordinates, ends, properties, id) {\n    /**\n    * @private\n    * @type {module:ol/extent~Extent|undefined}\n    */\n    this.extent_;\n\n    /**\n    * @private\n    * @type {number|string|undefined}\n    */\n    this.id_ = id;\n\n    /**\n    * @private\n    * @type {module:ol/geom/GeometryType}\n    */\n    this.type_ = type;\n\n    /**\n    * @private\n    * @type {Array<number>}\n    */\n    this.flatCoordinates_ = flatCoordinates;\n\n    /**\n    * @private\n    * @type {Array<number>}\n    */\n    this.flatInteriorPoints_ = null;\n\n    /**\n    * @private\n    * @type {Array<number>}\n    */\n    this.flatMidpoints_ = null;\n\n    /**\n    * @private\n    * @type {Array<number>|Array<Array<number>>}\n    */\n    this.ends_ = ends;\n\n    /**\n    * @private\n    * @type {Object<string, *>}\n    */\n    this.properties_ = properties;\n\n  }\n\n  /**\n  * Get a feature property by its key.\n  * @param {string} key Key\n  * @return {*} Value for the requested key.\n  * @api\n  */\n  get(key) {\n    return this.properties_[key];\n  }\n\n  /**\n  * Get the extent of this feature's geometry.\n  * @return {module:ol/extent~Extent} Extent.\n  * @api\n  */\n  getExtent() {\n    if (!this.extent_) {\n      this.extent_ = this.type_ === GeometryType.POINT ?\n        createOrUpdateFromCoordinate(this.flatCoordinates_) :\n        createOrUpdateFromFlatCoordinates(\n          this.flatCoordinates_, 0, this.flatCoordinates_.length, 2);\n\n    }\n    return this.extent_;\n  }\n\n  /**\n  * @return {Array<number>} Flat interior points.\n  */\n  getFlatInteriorPoint() {\n    if (!this.flatInteriorPoints_) {\n      const flatCenter = getCenter(this.getExtent());\n      this.flatInteriorPoints_ = getInteriorPointOfArray(\n        this.flatCoordinates_, 0, this.ends_, 2, flatCenter, 0);\n    }\n    return this.flatInteriorPoints_;\n  }\n\n  /**\n  * @return {Array<number>} Flat interior points.\n  */\n  getFlatInteriorPoints() {\n    if (!this.flatInteriorPoints_) {\n      const flatCenters = linearRingssCenter(\n        this.flatCoordinates_, 0, this.ends_, 2);\n      this.flatInteriorPoints_ = getInteriorPointsOfMultiArray(\n        this.flatCoordinates_, 0, this.ends_, 2, flatCenters);\n    }\n    return this.flatInteriorPoints_;\n  }\n\n  /**\n  * @return {Array<number>} Flat midpoint.\n  */\n  getFlatMidpoint() {\n    if (!this.flatMidpoints_) {\n      this.flatMidpoints_ = interpolatePoint(\n        this.flatCoordinates_, 0, this.flatCoordinates_.length, 2, 0.5);\n    }\n    return this.flatMidpoints_;\n  }\n\n  /**\n  * @return {Array<number>} Flat midpoints.\n  */\n  getFlatMidpoints() {\n    if (!this.flatMidpoints_) {\n      this.flatMidpoints_ = [];\n      const flatCoordinates = this.flatCoordinates_;\n      let offset = 0;\n      const ends = this.ends_;\n      for (let i = 0, ii = ends.length; i < ii; ++i) {\n        const end = ends[i];\n        const midpoint = interpolatePoint(\n          flatCoordinates, offset, end, 2, 0.5);\n        extend(this.flatMidpoints_, midpoint);\n        offset = end;\n      }\n    }\n    return this.flatMidpoints_;\n  }\n\n  /**\n  * Get the feature identifier.  This is a stable identifier for the feature and\n  * is set when reading data from a remote source.\n  * @return {number|string|undefined} Id.\n  * @api\n  */\n  getId() {\n    return this.id_;\n  }\n\n  /**\n  * @return {Array<number>} Flat coordinates.\n  */\n  getOrientedFlatCoordinates() {\n    return this.flatCoordinates_;\n  }\n\n  /**\n  * For API compatibility with {@link module:ol/Feature~Feature}, this method is useful when\n  * determining the geometry type in style function (see {@link #getType}).\n  * @return {module:ol/render/Feature} Feature.\n  * @api\n  */\n  getGeometry() {\n    return this;\n  }\n\n  /**\n  * Get the feature properties.\n  * @return {Object<string, *>} Feature properties.\n  * @api\n  */\n  getProperties() {\n    return this.properties_;\n  }\n\n  /**\n  * @return {number} Stride.\n  */\n  getStride() {\n    return 2;\n  }\n\n  /**\n  * Get the type of this feature's geometry.\n  * @return {module:ol/geom/GeometryType} Geometry type.\n  * @api\n  */\n  getType() {\n    return this.type_;\n  }\n\n  /**\n  * Transform geometry coordinates from tile pixel space to projected.\n  * The SRS of the source and destination are expected to be the same.\n  *\n  * @param {module:ol/proj~ProjectionLike} source The current projection\n  * @param {module:ol/proj~ProjectionLike} destination The desired projection.\n  */\n  transform(source, destination) {\n    source = getProjection(source);\n    const pixelExtent = source.getExtent();\n    const projectedExtent = source.getWorldExtent();\n    const scale = getHeight(projectedExtent) / getHeight(pixelExtent);\n    composeTransform(tmpTransform,\n      projectedExtent[0], projectedExtent[3],\n      scale, -scale, 0,\n      0, 0);\n    transform2D(this.flatCoordinates_, 0, this.flatCoordinates_.length, 2,\n      tmpTransform, this.flatCoordinates_);\n  }\n}\n\n\n/**\n * @return {Array<number>|Array<Array<number>>} Ends or endss.\n */\nRenderFeature.prototype.getEnds =\nRenderFeature.prototype.getEndss = function() {\n  return this.ends_;\n};\n\n\n/**\n * @return {Array<number>} Flat coordinates.\n */\nRenderFeature.prototype.getFlatCoordinates =\n    RenderFeature.prototype.getOrientedFlatCoordinates;\n\n\n/**\n * Get the feature for working with its geometry.\n * @return {module:ol/render/Feature} Feature.\n */\nRenderFeature.prototype.getSimplifiedGeometry =\n    RenderFeature.prototype.getGeometry;\n\n\n/**\n * @return {undefined}\n */\nRenderFeature.prototype.getStyleFunction = VOID;\n\n\nexport default RenderFeature;\n","/**\n * @module ol/format/MVT\n */\n//FIXME Implement projection handling\n\nimport {assert} from '../asserts.js';\nimport PBF from 'pbf';\nimport FeatureFormat, {transformWithOptions} from '../format/Feature.js';\nimport FormatType from '../format/FormatType.js';\nimport GeometryLayout from '../geom/GeometryLayout.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport LineString from '../geom/LineString.js';\nimport MultiLineString from '../geom/MultiLineString.js';\nimport MultiPoint from '../geom/MultiPoint.js';\nimport MultiPolygon from '../geom/MultiPolygon.js';\nimport Point from '../geom/Point.js';\nimport Polygon from '../geom/Polygon.js';\nimport {linearRingIsClockwise} from '../geom/flat/orient.js';\nimport Projection from '../proj/Projection.js';\nimport Units from '../proj/Units.js';\nimport RenderFeature from '../render/Feature.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {function((module:ol/geom/Geometry|Object<string,*>)=)|function(module:ol/geom/GeometryType,Array<number>,(Array<number>|Array<Array<number>>),Object<string,*>,number)} [featureClass]\n * Class for features returned by {@link module:ol/format/MVT#readFeatures}. Set to\n * {@link module:ol/Feature~Feature} to get full editing and geometry support at the cost of\n * decreased rendering performance. The default is {@link module:ol/render/Feature~RenderFeature},\n * which is optimized for rendering and hit detection.\n * @property {string} [geometryName='geometry'] Geometry name to use when creating\n * features.\n * @property {string} [layerName='layer'] Name of the feature attribute that\n * holds the layer name.\n * @property {Array<string>} [layers] Layers to read features from. If not\n * provided, features will be read from all layers.\n */\n\n\n/**\n * @classdesc\n * Feature format for reading data in the Mapbox MVT format.\n *\n * @param {module:ol/format/MVT~Options=} opt_options Options.\n * @api\n */\nclass MVT extends FeatureFormat {\n\n  /**\n   * @param {module:ol/format/MVT~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n    super();\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n     * @type {module:ol/proj/Projection}\n     */\n    this.dataProjection = new Projection({\n      code: '',\n      units: Units.TILE_PIXELS\n    });\n\n    /**\n     * @private\n     * @type {function((module:ol/geom/Geometry|Object<string,*>)=)|\n     *     function(module:ol/geom/GeometryType,Array<number>,\n     *         (Array<number>|Array<Array<number>>),Object<string,*>,number)}\n     */\n    this.featureClass_ = options.featureClass ?\n      options.featureClass : RenderFeature;\n\n    /**\n     * @private\n     * @type {string|undefined}\n     */\n    this.geometryName_ = options.geometryName;\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.layerName_ = options.layerName ? options.layerName : 'layer';\n\n    /**\n     * @private\n     * @type {Array<string>}\n     */\n    this.layers_ = options.layers ? options.layers : null;\n\n    /**\n     * @private\n     * @type {module:ol/extent~Extent}\n     */\n    this.extent_ = null;\n\n  }\n\n  /**\n   * Read the raw geometry from the pbf offset stored in a raw feature's geometry\n   * property.\n   * @suppress {missingProperties}\n   * @param {Object} pbf PBF.\n   * @param {Object} feature Raw feature.\n   * @param {Array<number>} flatCoordinates Array to store flat coordinates in.\n   * @param {Array<number>} ends Array to store ends in.\n   * @private\n   */\n  readRawGeometry_(pbf, feature, flatCoordinates, ends) {\n    pbf.pos = feature.geometry;\n\n    const end = pbf.readVarint() + pbf.pos;\n    let cmd = 1;\n    let length = 0;\n    let x = 0;\n    let y = 0;\n    let coordsLen = 0;\n    let currentEnd = 0;\n\n    while (pbf.pos < end) {\n      if (!length) {\n        const cmdLen = pbf.readVarint();\n        cmd = cmdLen & 0x7;\n        length = cmdLen >> 3;\n      }\n\n      length--;\n\n      if (cmd === 1 || cmd === 2) {\n        x += pbf.readSVarint();\n        y += pbf.readSVarint();\n\n        if (cmd === 1) { // moveTo\n          if (coordsLen > currentEnd) {\n            ends.push(coordsLen);\n            currentEnd = coordsLen;\n          }\n        }\n\n        flatCoordinates.push(x, y);\n        coordsLen += 2;\n\n      } else if (cmd === 7) {\n\n        if (coordsLen > currentEnd) {\n          // close polygon\n          flatCoordinates.push(\n            flatCoordinates[currentEnd], flatCoordinates[currentEnd + 1]);\n          coordsLen += 2;\n        }\n\n      } else {\n        assert(false, 59); // Invalid command found in the PBF\n      }\n    }\n\n    if (coordsLen > currentEnd) {\n      ends.push(coordsLen);\n      currentEnd = coordsLen;\n    }\n\n  }\n\n  /**\n   * @private\n   * @param {Object} pbf PBF\n   * @param {Object} rawFeature Raw Mapbox feature.\n   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.\n   * @return {module:ol/Feature|module:ol/render/Feature} Feature.\n   */\n  createFeature_(pbf, rawFeature, opt_options) {\n    const type = rawFeature.type;\n    if (type === 0) {\n      return null;\n    }\n\n    let feature;\n    const id = rawFeature.id;\n    const values = rawFeature.properties;\n    values[this.layerName_] = rawFeature.layer.name;\n\n    const flatCoordinates = [];\n    const ends = [];\n    this.readRawGeometry_(pbf, rawFeature, flatCoordinates, ends);\n\n    const geometryType = getGeometryType(type, ends.length);\n\n    if (this.featureClass_ === RenderFeature) {\n      feature = new this.featureClass_(geometryType, flatCoordinates, ends, values, id);\n    } else {\n      let geom;\n      if (geometryType == GeometryType.POLYGON) {\n        const endss = [];\n        let offset = 0;\n        let prevEndIndex = 0;\n        for (let i = 0, ii = ends.length; i < ii; ++i) {\n          const end = ends[i];\n          if (!linearRingIsClockwise(flatCoordinates, offset, end, 2)) {\n            endss.push(ends.slice(prevEndIndex, i));\n            prevEndIndex = i;\n          }\n          offset = end;\n        }\n        if (endss.length > 1) {\n          geom = new MultiPolygon(flatCoordinates, GeometryLayout.XY, endss);\n        } else {\n          geom = new Polygon(flatCoordinates, GeometryLayout.XY, ends);\n        }\n      } else {\n        geom = geometryType === GeometryType.POINT ? new Point(flatCoordinates, GeometryLayout.XY) :\n          geometryType === GeometryType.LINE_STRING ? new LineString(flatCoordinates, GeometryLayout.XY) :\n            geometryType === GeometryType.POLYGON ? new Polygon(flatCoordinates, GeometryLayout.XY, ends) :\n              geometryType === GeometryType.MULTI_POINT ? new MultiPoint(flatCoordinates, GeometryLayout.XY) :\n                geometryType === GeometryType.MULTI_LINE_STRING ? new MultiLineString(flatCoordinates, GeometryLayout.XY, ends) :\n                  null;\n      }\n      feature = new this.featureClass_();\n      if (this.geometryName_) {\n        feature.setGeometryName(this.geometryName_);\n      }\n      const geometry = transformWithOptions(geom, false, this.adaptOptions(opt_options));\n      feature.setGeometry(geometry);\n      feature.setId(id);\n      feature.setProperties(values);\n    }\n\n    return feature;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getLastExtent() {\n    return this.extent_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getType() {\n    return FormatType.ARRAY_BUFFER;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  readFeatures(source, opt_options) {\n    const layers = this.layers_;\n\n    const pbf = new PBF(/** @type {ArrayBuffer} */ (source));\n    const pbfLayers = pbf.readFields(layersPBFReader, {});\n    /** @type {Array<module:ol/Feature|module:ol/render/Feature>} */\n    const features = [];\n    for (const name in pbfLayers) {\n      if (layers && layers.indexOf(name) == -1) {\n        continue;\n      }\n      const pbfLayer = pbfLayers[name];\n\n      for (let i = 0, ii = pbfLayer.length; i < ii; ++i) {\n        const rawFeature = readRawFeature(pbf, pbfLayer, i);\n        features.push(this.createFeature_(pbf, rawFeature));\n      }\n      this.extent_ = pbfLayer ? [0, 0, pbfLayer.extent, pbfLayer.extent] : null;\n    }\n\n    return features;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  readProjection(source) {\n    return this.dataProjection;\n  }\n\n  /**\n   * Sets the layers that features will be read from.\n   * @param {Array<string>} layers Layers.\n   * @api\n   */\n  setLayers(layers) {\n    this.layers_ = layers;\n  }\n\n}\n\n\n/**\n * Reader callback for parsing layers.\n * @param {number} tag The tag.\n * @param {Object} layers The layers object.\n * @param {Object} pbf The PBF.\n */\nfunction layersPBFReader(tag, layers, pbf) {\n  if (tag === 3) {\n    const layer = {\n      keys: [],\n      values: [],\n      features: []\n    };\n    const end = pbf.readVarint() + pbf.pos;\n    pbf.readFields(layerPBFReader, layer, end);\n    layer.length = layer.features.length;\n    if (layer.length) {\n      layers[layer.name] = layer;\n    }\n  }\n}\n\n/**\n * Reader callback for parsing layer.\n * @param {number} tag The tag.\n * @param {Object} layer The layer object.\n * @param {Object} pbf The PBF.\n */\nfunction layerPBFReader(tag, layer, pbf) {\n  if (tag === 15) {\n    layer.version = pbf.readVarint();\n  } else if (tag === 1) {\n    layer.name = pbf.readString();\n  } else if (tag === 5) {\n    layer.extent = pbf.readVarint();\n  } else if (tag === 2) {\n    layer.features.push(pbf.pos);\n  } else if (tag === 3) {\n    layer.keys.push(pbf.readString());\n  } else if (tag === 4) {\n    let value = null;\n    const end = pbf.readVarint() + pbf.pos;\n    while (pbf.pos < end) {\n      tag = pbf.readVarint() >> 3;\n      value = tag === 1 ? pbf.readString() :\n        tag === 2 ? pbf.readFloat() :\n          tag === 3 ? pbf.readDouble() :\n            tag === 4 ? pbf.readVarint64() :\n              tag === 5 ? pbf.readVarint() :\n                tag === 6 ? pbf.readSVarint() :\n                  tag === 7 ? pbf.readBoolean() : null;\n    }\n    layer.values.push(value);\n  }\n}\n\n/**\n * Reader callback for parsing feature.\n * @param {number} tag The tag.\n * @param {Object} feature The feature object.\n * @param {Object} pbf The PBF.\n */\nfunction featurePBFReader(tag, feature, pbf) {\n  if (tag == 1) {\n    feature.id = pbf.readVarint();\n  } else if (tag == 2) {\n    const end = pbf.readVarint() + pbf.pos;\n    while (pbf.pos < end) {\n      const key = feature.layer.keys[pbf.readVarint()];\n      const value = feature.layer.values[pbf.readVarint()];\n      feature.properties[key] = value;\n    }\n  } else if (tag == 3) {\n    feature.type = pbf.readVarint();\n  } else if (tag == 4) {\n    feature.geometry = pbf.pos;\n  }\n}\n\n\n/**\n * Read a raw feature from the pbf offset stored at index `i` in the raw layer.\n * @suppress {missingProperties}\n * @param {Object} pbf PBF.\n * @param {Object} layer Raw layer.\n * @param {number} i Index of the feature in the raw layer's `features` array.\n * @return {Object} Raw feature.\n */\nfunction readRawFeature(pbf, layer, i) {\n  pbf.pos = layer.features[i];\n  const end = pbf.readVarint() + pbf.pos;\n\n  const feature = {\n    layer: layer,\n    type: 0,\n    properties: {}\n  };\n  pbf.readFields(featurePBFReader, feature, end);\n  return feature;\n}\n\n\n/**\n * @suppress {missingProperties}\n * @param {number} type The raw feature's geometry type\n * @param {number} numEnds Number of ends of the flat coordinates of the\n * geometry.\n * @return {module:ol/geom/GeometryType} The geometry type.\n */\nfunction getGeometryType(type, numEnds) {\n  /** @type {module:ol/geom/GeometryType} */\n  let geometryType;\n  if (type === 1) {\n    geometryType = numEnds === 1 ?\n      GeometryType.POINT : GeometryType.MULTI_POINT;\n  } else if (type === 2) {\n    geometryType = numEnds === 1 ?\n      GeometryType.LINE_STRING :\n      GeometryType.MULTI_LINE_STRING;\n  } else if (type === 3) {\n    geometryType = GeometryType.POLYGON;\n    // MultiPolygon not relevant for rendering - winding order determines\n    // outer rings of polygons.\n  }\n  return geometryType;\n}\n\nexport default MVT;\n","/**\n * @module ol/layer/TileProperty\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  PRELOAD: 'preload',\n  USE_INTERIM_TILES_ON_ERROR: 'useInterimTilesOnError'\n};\n","/**\n * @module ol/layer/Tile\n */\nimport LayerType from '../LayerType.js';\nimport Layer from '../layer/Layer.js';\nimport TileProperty from '../layer/TileProperty.js';\nimport {assign} from '../obj.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [opacity=1] Opacity (0, 1).\n * @property {boolean} [visible=true] Visibility.\n * @property {module:ol/extent~Extent} [extent] The bounding extent for layer rendering.  The layer will not be\n * rendered outside of this extent.\n * @property {number} [zIndex=0] The z-index for layer rendering.  At rendering time, the layers\n * will be ordered, first by Z-index and then by position.\n * @property {number} [minResolution] The minimum resolution (inclusive) at which this layer will be\n * visible.\n * @property {number} [maxResolution] The maximum resolution (exclusive) below which this layer will\n * be visible.\n * @property {number} [preload=0] Preload. Load low-resolution tiles up to `preload` levels. `0`\n * means no preloading.\n * @property {module:ol/source/Tile} [source] Source for this layer.\n * @property {module:ol/PluggableMap} [map] Sets the layer as overlay on a map. The map will not manage\n * this layer in its layers collection, and the layer will be rendered on top. This is useful for\n * temporary layers. The standard way to add a layer to a map and have it managed by the map is to\n * use {@link module:ol/Map#addLayer}.\n * @property {boolean} [useInterimTilesOnError=true] Use interim tiles on error.\n */\n\n/**\n * @classdesc\n * For layer sources that provide pre-rendered, tiled images in grids that are\n * organized by zoom levels for specific resolutions.\n * Note that any property set in the options is set as a {@link module:ol/Object~BaseObject}\n * property on the layer object; for example, setting `title: 'My Title'` in the\n * options means that `title` is observable, and has get/set accessors.\n *\n * @api\n */\nclass TileLayer extends Layer {\n  /**\n   * @param {module:ol/layer/Tile~Options=} opt_options Tile layer options.\n   */\n  constructor(opt_options) {\n    const options = opt_options ? opt_options : {};\n\n    const baseOptions = assign({}, options);\n\n    delete baseOptions.preload;\n    delete baseOptions.useInterimTilesOnError;\n    super(baseOptions);\n\n    this.setPreload(options.preload !== undefined ? options.preload : 0);\n    this.setUseInterimTilesOnError(options.useInterimTilesOnError !== undefined ?\n      options.useInterimTilesOnError : true);\n\n    /**\n    * The layer type.\n    * @protected\n    * @type {module:ol/LayerType}\n    */\n    this.type = LayerType.TILE;\n\n  }\n\n  /**\n  * Return the level as number to which we will preload tiles up to.\n  * @return {number} The level to preload tiles up to.\n  * @observable\n  * @api\n  */\n  getPreload() {\n    return /** @type {number} */ (this.get(TileProperty.PRELOAD));\n  }\n\n  /**\n  * Set the level as number to which we will preload tiles up to.\n  * @param {number} preload The level to preload tiles up to.\n  * @observable\n  * @api\n  */\n  setPreload(preload) {\n    this.set(TileProperty.PRELOAD, preload);\n  }\n\n  /**\n  * Whether we use interim tiles on error.\n  * @return {boolean} Use interim tiles on error.\n  * @observable\n  * @api\n  */\n  getUseInterimTilesOnError() {\n    return /** @type {boolean} */ (this.get(TileProperty.USE_INTERIM_TILES_ON_ERROR));\n  }\n\n  /**\n  * Set whether we use interim tiles on error.\n  * @param {boolean} useInterimTilesOnError Use interim tiles on error.\n  * @observable\n  * @api\n  */\n  setUseInterimTilesOnError(useInterimTilesOnError) {\n    this.set(TileProperty.USE_INTERIM_TILES_ON_ERROR, useInterimTilesOnError);\n  }\n}\n\n\n/**\n * Return the associated {@link module:ol/source/Tile tilesource} of the layer.\n * @function\n * @return {module:ol/source/Tile} Source.\n * @api\n */\nTileLayer.prototype.getSource;\n\n\nexport default TileLayer;\n","/**\n * @module ol/layer/VectorTile\n */\nimport LayerType from '../LayerType.js';\nimport {assert} from '../asserts.js';\nimport TileProperty from '../layer/TileProperty.js';\nimport VectorLayer from '../layer/Vector.js';\nimport VectorTileRenderType from '../layer/VectorTileRenderType.js';\nimport {assign} from '../obj.js';\n\n\n/**\n * @enum {string}\n * Render mode for vector tiles:\n *  * `'image'`: Vector tiles are rendered as images. Great performance, but\n *    point symbols and texts are always rotated with the view and pixels are\n *    scaled during zoom animations.\n *  * `'hybrid'`: Polygon and line elements are rendered as images, so pixels\n *    are scaled during zoom animations. Point symbols and texts are accurately\n *    rendered as vectors and can stay upright on rotated views.\n *  * `'vector'`: Vector tiles are rendered as vectors. Most accurate rendering\n *    even during animations, but slower performance than the other options.\n * @api\n */\nexport const RenderType = {\n  IMAGE: 'image',\n  HYBRID: 'hybrid',\n  VECTOR: 'vector'\n};\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [opacity=1] Opacity (0, 1).\n * @property {boolean} [visible=true] Visibility.\n * @property {module:ol/extent~Extent} [extent] The bounding extent for layer rendering.  The layer will not be\n * rendered outside of this extent.\n * @property {number} [zIndex=0] The z-index for layer rendering.  At rendering time, the layers\n * will be ordered, first by Z-index and then by position.\n * @property {number} [minResolution] The minimum resolution (inclusive) at which this layer will be\n * visible.\n * @property {number} [maxResolution] The maximum resolution (exclusive) below which this layer will\n * be visible.\n * @property {module:ol/render~OrderFunction} [renderOrder] Render order. Function to be used when sorting\n * features before rendering. By default features are drawn in the order that they are created. Use\n * `null` to avoid the sort, but get an undefined draw order.\n * @property {number} [renderBuffer=100] The buffer in pixels around the tile extent used by the\n * renderer when getting features from the vector tile for the rendering or hit-detection.\n * Recommended value: Vector tiles are usually generated with a buffer, so this value should match\n * the largest possible buffer of the used tiles. It should be at least the size of the largest\n * point symbol or line width.\n * @property {module:ol/layer/VectorTileRenderType|string} [renderMode='hybrid'] Render mode for vector tiles:\n *  * `'image'`: Vector tiles are rendered as images. Great performance, but point symbols and texts\n *    are always rotated with the view and pixels are scaled during zoom animations.\n *  * `'hybrid'`: Polygon and line elements are rendered as images, so pixels are scaled during zoom\n *    animations. Point symbols and texts are accurately rendered as vectors and can stay upright on\n *    rotated views.\n *  * `'vector'`: Vector tiles are rendered as vectors. Most accurate rendering even during\n *    animations, but slower performance than the other options.\n *\n * When `declutter` is set to `true`, `'hybrid'` will be used instead of `'image'`.\n * @property {module:ol/source/VectorTile} [source] Source.\n * @property {module:ol/PluggableMap} [map] Sets the layer as overlay on a map. The map will not manage\n * this layer in its layers collection, and the layer will be rendered on top. This is useful for\n * temporary layers. The standard way to add a layer to a map and have it managed by the map is to\n * use {@link module:ol/Map#addLayer}.\n * @property {boolean} [declutter=false] Declutter images and text. Decluttering is applied to all\n * image and text styles, and the priority is defined by the z-index of the style. Lower z-index\n * means higher priority. When set to `true`, a `renderMode` of `'image'` will be overridden with\n * `'hybrid'`.\n * @property {module:ol/style/Style|Array<module:ol/style/Style>|module:ol/style/Style~StyleFunction} [style] Layer style. See\n * {@link module:ol/style} for default style which will be used if this is not defined.\n * @property {boolean} [updateWhileAnimating=false] When set to `true`, feature batches will be\n * recreated during animations. This means that no vectors will be shown clipped, but the setting\n * will have a performance impact for large amounts of vector data. When set to `false`, batches\n * will be recreated when no animation is active.\n * @property {boolean} [updateWhileInteracting=false] When set to `true`, feature batches will be\n * recreated during interactions. See also `updateWhileAnimating`.\n * @property {number} [preload=0] Preload. Load low-resolution tiles up to `preload` levels. `0`\n * means no preloading.\n * @property {module:ol/render~OrderFunction} [renderOrder] Render order. Function to be used when sorting\n * features before rendering. By default features are drawn in the order that they are created.\n * @property {module:ol/style/Style|Array<module:ol/style/Style>|module:ol/style/Style~StyleFunction} [style] Layer style. See\n * {@link module:ol/style} for default style which will be used if this is not defined.\n * @property {boolean} [useInterimTilesOnError=true] Use interim tiles on error.\n */\n\n\n/**\n * @classdesc\n * Layer for vector tile data that is rendered client-side.\n * Note that any property set in the options is set as a {@link module:ol/Object~BaseObject}\n * property on the layer object; for example, setting `title: 'My Title'` in the\n * options means that `title` is observable, and has get/set accessors.\n *\n * @param {module:ol/layer/VectorTile~Options=} opt_options Options.\n * @api\n */\nclass VectorTileLayer extends VectorLayer {\n  /**\n   * @param {module:ol/layer/VectorTile~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n    const options = opt_options ? opt_options : {};\n\n    let renderMode = options.renderMode || VectorTileRenderType.HYBRID;\n    assert(renderMode == undefined ||\n       renderMode == VectorTileRenderType.IMAGE ||\n       renderMode == VectorTileRenderType.HYBRID ||\n       renderMode == VectorTileRenderType.VECTOR,\n    28); // `renderMode` must be `'image'`, `'hybrid'` or `'vector'`\n    if (options.declutter && renderMode == VectorTileRenderType.IMAGE) {\n      renderMode = VectorTileRenderType.HYBRID;\n    }\n    options.renderMode = renderMode;\n\n    const baseOptions = assign({}, options);\n\n    delete baseOptions.preload;\n    delete baseOptions.useInterimTilesOnError;\n    super(baseOptions);\n\n    this.setPreload(options.preload ? options.preload : 0);\n    this.setUseInterimTilesOnError(options.useInterimTilesOnError !== undefined ?\n      options.useInterimTilesOnError : true);\n\n    /**\n    * The layer type.\n    * @protected\n    * @type {module:ol/LayerType}\n    */\n    this.type = LayerType.VECTOR_TILE;\n\n  }\n\n  /**\n  * Return the level as number to which we will preload tiles up to.\n  * @return {number} The level to preload tiles up to.\n  * @observable\n  * @api\n  */\n  getPreload() {\n    return /** @type {number} */ (this.get(TileProperty.PRELOAD));\n  }\n\n  /**\n  * Whether we use interim tiles on error.\n  * @return {boolean} Use interim tiles on error.\n  * @observable\n  * @api\n  */\n  getUseInterimTilesOnError() {\n    return /** @type {boolean} */ (this.get(TileProperty.USE_INTERIM_TILES_ON_ERROR));\n  }\n\n  /**\n  * Set the level as number to which we will preload tiles up to.\n  * @param {number} preload The level to preload tiles up to.\n  * @observable\n  * @api\n  */\n  setPreload(preload) {\n    this.set(TileProperty.PRELOAD, preload);\n  }\n\n  /**\n  * Set whether we use interim tiles on error.\n  * @param {boolean} useInterimTilesOnError Use interim tiles on error.\n  * @observable\n  * @api\n  */\n  setUseInterimTilesOnError(useInterimTilesOnError) {\n    this.set(TileProperty.USE_INTERIM_TILES_ON_ERROR, useInterimTilesOnError);\n  }\n}\n\n\n/**\n * Return the associated {@link module:ol/source/VectorTile vectortilesource} of the layer.\n * @function\n * @return {module:ol/source/VectorTile} Source.\n * @api\n */\nVectorTileLayer.prototype.getSource;\nexport default VectorTileLayer;\n","/**\n * @module ol/tileurlfunction\n */\nimport {assert} from './asserts.js';\nimport {modulo} from './math.js';\nimport {hash as tileCoordHash} from './tilecoord.js';\n\n\n/**\n * @param {string} template Template.\n * @param {module:ol/tilegrid/TileGrid} tileGrid Tile grid.\n * @return {module:ol/Tile~UrlFunction} Tile URL function.\n */\nexport function createFromTemplate(template, tileGrid) {\n  const zRegEx = /\\{z\\}/g;\n  const xRegEx = /\\{x\\}/g;\n  const yRegEx = /\\{y\\}/g;\n  const dashYRegEx = /\\{-y\\}/g;\n  return (\n    /**\n     * @param {module:ol/tilecoord~TileCoord} tileCoord Tile Coordinate.\n     * @param {number} pixelRatio Pixel ratio.\n     * @param {module:ol/proj/Projection} projection Projection.\n     * @return {string|undefined} Tile URL.\n     */\n    function(tileCoord, pixelRatio, projection) {\n      if (!tileCoord) {\n        return undefined;\n      } else {\n        return template.replace(zRegEx, tileCoord[0].toString())\n          .replace(xRegEx, tileCoord[1].toString())\n          .replace(yRegEx, function() {\n            const y = -tileCoord[2] - 1;\n            return y.toString();\n          })\n          .replace(dashYRegEx, function() {\n            const z = tileCoord[0];\n            const range = tileGrid.getFullTileRange(z);\n            assert(range, 55); // The {-y} placeholder requires a tile grid with extent\n            const y = range.getHeight() + tileCoord[2];\n            return y.toString();\n          });\n      }\n    }\n  );\n}\n\n\n/**\n * @param {Array<string>} templates Templates.\n * @param {module:ol/tilegrid/TileGrid} tileGrid Tile grid.\n * @return {module:ol/Tile~UrlFunction} Tile URL function.\n */\nexport function createFromTemplates(templates, tileGrid) {\n  const len = templates.length;\n  const tileUrlFunctions = new Array(len);\n  for (let i = 0; i < len; ++i) {\n    tileUrlFunctions[i] = createFromTemplate(templates[i], tileGrid);\n  }\n  return createFromTileUrlFunctions(tileUrlFunctions);\n}\n\n\n/**\n * @param {Array<module:ol/Tile~UrlFunction>} tileUrlFunctions Tile URL Functions.\n * @return {module:ol/Tile~UrlFunction} Tile URL function.\n */\nexport function createFromTileUrlFunctions(tileUrlFunctions) {\n  if (tileUrlFunctions.length === 1) {\n    return tileUrlFunctions[0];\n  }\n  return (\n    /**\n     * @param {module:ol/tilecoord~TileCoord} tileCoord Tile Coordinate.\n     * @param {number} pixelRatio Pixel ratio.\n     * @param {module:ol/proj/Projection} projection Projection.\n     * @return {string|undefined} Tile URL.\n     */\n    function(tileCoord, pixelRatio, projection) {\n      if (!tileCoord) {\n        return undefined;\n      } else {\n        const h = tileCoordHash(tileCoord);\n        const index = modulo(h, tileUrlFunctions.length);\n        return tileUrlFunctions[index](tileCoord, pixelRatio, projection);\n      }\n    }\n  );\n}\n\n\n/**\n * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n * @param {number} pixelRatio Pixel ratio.\n * @param {module:ol/proj/Projection} projection Projection.\n * @return {string|undefined} Tile URL.\n */\nexport function nullTileUrlFunction(tileCoord, pixelRatio, projection) {\n  return undefined;\n}\n\n\n/**\n * @param {string} url URL.\n * @return {Array<string>} Array of urls.\n */\nexport function expandUrl(url) {\n  const urls = [];\n  let match = /\\{([a-z])-([a-z])\\}/.exec(url);\n  if (match) {\n    // char range\n    const startCharCode = match[1].charCodeAt(0);\n    const stopCharCode = match[2].charCodeAt(0);\n    let charCode;\n    for (charCode = startCharCode; charCode <= stopCharCode; ++charCode) {\n      urls.push(url.replace(match[0], String.fromCharCode(charCode)));\n    }\n    return urls;\n  }\n  match = match = /\\{(\\d+)-(\\d+)\\}/.exec(url);\n  if (match) {\n    // number range\n    const stop = parseInt(match[2], 10);\n    for (let i = parseInt(match[1], 10); i <= stop; i++) {\n      urls.push(url.replace(match[0], i.toString()));\n    }\n    return urls;\n  }\n  urls.push(url);\n  return urls;\n}\n","/**\n * @module ol/Tile\n */\nimport TileState from './TileState.js';\nimport {easeIn} from './easing.js';\nimport EventTarget from './events/Target.js';\nimport EventType from './events/EventType.js';\n\n\n/**\n * A function that takes an {@link module:ol/Tile} for the tile and a\n * `{string}` for the url as arguments. The default is\n * ```js\n * source.setTileLoadFunction(function(tile, src) {\n *   tile.getImage().src = src;\n * });\n * ```\n * For more fine grained control, the load function can use fetch or XMLHttpRequest and involve\n * error handling:\n *\n * ```js\n * import TileState from 'ol/TileState';\n *\n * source.setTileLoadFunction(function(tile, src) {\n *   var xhr = new XMLHttpRequest();\n *   xhr.responseType = 'blob';\n *   xhr.addEventListener('loadend', function (evt) {\n *     var data = this.response;\n *     if (data !== undefined) {\n *       tile.getImage().src = URL.createObjectURL(data);\n *     } else {\n *       tile.setState(TileState.ERROR);\n *     }\n *   });\n *   xhr.addEventListener('error', function () {\n *     tile.setState(TileState.ERROR);\n *   });\n *   xhr.open('GET', src);\n *   xhr.send();\n * });\n * ```\n *\n * @typedef {function(module:ol/Tile, string)} LoadFunction\n * @api\n */\n\n/**\n * {@link module:ol/source/Tile~Tile} sources use a function of this type to get\n * the url that provides a tile for a given tile coordinate.\n *\n * This function takes an {@link module:ol/tilecoord~TileCoord} for the tile\n * coordinate, a `{number}` representing the pixel ratio and a\n * {@link module:ol/proj/Projection} for the projection  as arguments\n * and returns a `{string}` representing the tile URL, or undefined if no tile\n * should be requested for the passed tile coordinate.\n *\n * @typedef {function(module:ol/tilecoord~TileCoord, number,\n *           module:ol/proj/Projection): (string|undefined)} UrlFunction\n * @api\n */\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [transition=250] A duration for tile opacity\n * transitions in milliseconds. A duration of 0 disables the opacity transition.\n * @api\n */\n\n\n/**\n * @classdesc\n * Base class for tiles.\n *\n * @abstract\n */\nclass Tile extends EventTarget {\n\n  /**\n   * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n   * @param {module:ol/TileState} state State.\n   * @param {module:ol/Tile~Options=} opt_options Tile options.\n   */\n  constructor(tileCoord, state, opt_options) {\n    super();\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n     * @type {module:ol/tilecoord~TileCoord}\n     */\n    this.tileCoord = tileCoord;\n\n    /**\n     * @protected\n     * @type {module:ol/TileState}\n     */\n    this.state = state;\n\n    /**\n     * An \"interim\" tile for this tile. The interim tile may be used while this\n     * one is loading, for \"smooth\" transitions when changing params/dimensions\n     * on the source.\n     * @type {module:ol/Tile}\n     */\n    this.interimTile = null;\n\n    /**\n     * A key assigned to the tile. This is used by the tile source to determine\n     * if this tile can effectively be used, or if a new tile should be created\n     * and this one be used as an interim tile for this new tile.\n     * @type {string}\n     */\n    this.key = '';\n\n    /**\n     * The duration for the opacity transition.\n     * @type {number}\n     */\n    this.transition_ = options.transition === undefined ? 250 : options.transition;\n\n    /**\n     * Lookup of start times for rendering transitions.  If the start time is\n     * equal to -1, the transition is complete.\n     * @type {Object<number, number>}\n     */\n    this.transitionStarts_ = {};\n\n  }\n\n  /**\n   * @protected\n   */\n  changed() {\n    this.dispatchEvent(EventType.CHANGE);\n  }\n\n  /**\n   * @return {string} Key.\n   */\n  getKey() {\n    return this.key + '/' + this.tileCoord;\n  }\n\n  /**\n   * Get the interim tile most suitable for rendering using the chain of interim\n   * tiles. This corresponds to the  most recent tile that has been loaded, if no\n   * such tile exists, the original tile is returned.\n   * @return {!module:ol/Tile} Best tile for rendering.\n   */\n  getInterimTile() {\n    if (!this.interimTile) {\n      //empty chain\n      return this;\n    }\n    let tile = this.interimTile;\n\n    // find the first loaded tile and return it. Since the chain is sorted in\n    // decreasing order of creation time, there is no need to search the remainder\n    // of the list (all those tiles correspond to older requests and will be\n    // cleaned up by refreshInterimChain)\n    do {\n      if (tile.getState() == TileState.LOADED) {\n        return tile;\n      }\n      tile = tile.interimTile;\n    } while (tile);\n\n    // we can not find a better tile\n    return this;\n  }\n\n  /**\n   * Goes through the chain of interim tiles and discards sections of the chain\n   * that are no longer relevant.\n   */\n  refreshInterimChain() {\n    if (!this.interimTile) {\n      return;\n    }\n\n    let tile = this.interimTile;\n    let prev = this;\n\n    do {\n      if (tile.getState() == TileState.LOADED) {\n        //we have a loaded tile, we can discard the rest of the list\n        //we would could abort any LOADING tile request\n        //older than this tile (i.e. any LOADING tile following this entry in the chain)\n        tile.interimTile = null;\n        break;\n      } else if (tile.getState() == TileState.LOADING) {\n        //keep this LOADING tile any loaded tiles later in the chain are\n        //older than this tile, so we're still interested in the request\n        prev = tile;\n      } else if (tile.getState() == TileState.IDLE) {\n        //the head of the list is the most current tile, we don't need\n        //to start any other requests for this chain\n        prev.interimTile = tile.interimTile;\n      } else {\n        prev = tile;\n      }\n      tile = prev.interimTile;\n    } while (tile);\n  }\n\n  /**\n   * Get the tile coordinate for this tile.\n   * @return {module:ol/tilecoord~TileCoord} The tile coordinate.\n   * @api\n   */\n  getTileCoord() {\n    return this.tileCoord;\n  }\n\n  /**\n   * @return {module:ol/TileState} State.\n   */\n  getState() {\n    return this.state;\n  }\n\n  /**\n   * Sets the state of this tile. If you write your own {@link module:ol/Tile~LoadFunction tileLoadFunction} ,\n   * it is important to set the state correctly to {@link module:ol/TileState~ERROR}\n   * when the tile cannot be loaded. Otherwise the tile cannot be removed from\n   * the tile queue and will block other requests.\n   * @param {module:ol/TileState} state State.\n   * @api\n   */\n  setState(state) {\n    this.state = state;\n    this.changed();\n  }\n\n  /**\n   * Load the image or retry if loading previously failed.\n   * Loading is taken care of by the tile queue, and calling this method is\n   * only needed for preloading or for reloading in case of an error.\n   * @abstract\n   * @api\n   */\n  load() {}\n\n  /**\n   * Get the alpha value for rendering.\n   * @param {number} id An id for the renderer.\n   * @param {number} time The render frame time.\n   * @return {number} A number between 0 and 1.\n   */\n  getAlpha(id, time) {\n    if (!this.transition_) {\n      return 1;\n    }\n\n    let start = this.transitionStarts_[id];\n    if (!start) {\n      start = time;\n      this.transitionStarts_[id] = start;\n    } else if (start === -1) {\n      return 1;\n    }\n\n    const delta = time - start + (1000 / 60); // avoid rendering at 0\n    if (delta >= this.transition_) {\n      return 1;\n    }\n    return easeIn(delta / this.transition_);\n  }\n\n  /**\n   * Determine if a tile is in an alpha transition.  A tile is considered in\n   * transition if tile.getAlpha() has not yet been called or has been called\n   * and returned 1.\n   * @param {number} id An id for the renderer.\n   * @return {boolean} The tile is in transition.\n   */\n  inTransition(id) {\n    if (!this.transition_) {\n      return false;\n    }\n    return this.transitionStarts_[id] !== -1;\n  }\n\n  /**\n   * Mark a transition as complete.\n   * @param {number} id An id for the renderer.\n   */\n  endTransition(id) {\n    if (this.transition_) {\n      this.transitionStarts_[id] = -1;\n    }\n  }\n}\n\n\nexport default Tile;\n","/**\n * @module ol/ImageTile\n */\nimport Tile from './Tile.js';\nimport TileState from './TileState.js';\nimport {createCanvasContext2D} from './dom.js';\nimport {listenOnce, unlistenByKey} from './events.js';\nimport EventType from './events/EventType.js';\n\n/**\n * @typedef {function(new: module:ol/ImageTile, module:ol/tilecoord~TileCoord,\n * module:ol/TileState, string, ?string, module:ol/Tile~LoadFunction)} TileClass\n * @api\n */\n\nclass ImageTile extends Tile {\n\n  /**\n   * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n   * @param {module:ol/TileState} state State.\n   * @param {string} src Image source URI.\n   * @param {?string} crossOrigin Cross origin.\n   * @param {module:ol/Tile~LoadFunction} tileLoadFunction Tile load function.\n   * @param {module:ol/Tile~Options=} opt_options Tile options.\n   */\n  constructor(tileCoord, state, src, crossOrigin, tileLoadFunction, opt_options) {\n\n    super(tileCoord, state, opt_options);\n\n    /**\n     * @private\n     * @type {?string}\n     */\n    this.crossOrigin_ = crossOrigin;\n\n    /**\n     * Image URI\n     *\n     * @private\n     * @type {string}\n     */\n    this.src_ = src;\n\n    /**\n     * @private\n     * @type {HTMLImageElement|HTMLCanvasElement}\n     */\n    this.image_ = new Image();\n    if (crossOrigin !== null) {\n      this.image_.crossOrigin = crossOrigin;\n    }\n\n    /**\n     * @private\n     * @type {Array<module:ol/events~EventsKey>}\n     */\n    this.imageListenerKeys_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/Tile~LoadFunction}\n     */\n    this.tileLoadFunction_ = tileLoadFunction;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    if (this.state == TileState.LOADING) {\n      this.unlistenImage_();\n      this.image_ = getBlankImage();\n    }\n    if (this.interimTile) {\n      this.interimTile.dispose();\n    }\n    this.state = TileState.ABORT;\n    this.changed();\n    super.disposeInternal();\n  }\n\n  /**\n   * Get the HTML image element for this tile (may be a Canvas, Image, or Video).\n   * @return {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} Image.\n   * @api\n   */\n  getImage() {\n    return this.image_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getKey() {\n    return this.src_;\n  }\n\n  /**\n   * Tracks loading or read errors.\n   *\n   * @private\n   */\n  handleImageError_() {\n    this.state = TileState.ERROR;\n    this.unlistenImage_();\n    this.image_ = getBlankImage();\n    this.changed();\n  }\n\n  /**\n   * Tracks successful image load.\n   *\n   * @private\n   */\n  handleImageLoad_() {\n    if (this.image_.naturalWidth && this.image_.naturalHeight) {\n      this.state = TileState.LOADED;\n    } else {\n      this.state = TileState.EMPTY;\n    }\n    this.unlistenImage_();\n    this.changed();\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  load() {\n    if (this.state == TileState.ERROR) {\n      this.state = TileState.IDLE;\n      this.image_ = new Image();\n      if (this.crossOrigin_ !== null) {\n        this.image_.crossOrigin = this.crossOrigin_;\n      }\n    }\n    if (this.state == TileState.IDLE) {\n      this.state = TileState.LOADING;\n      this.changed();\n      this.imageListenerKeys_ = [\n        listenOnce(this.image_, EventType.ERROR,\n          this.handleImageError_, this),\n        listenOnce(this.image_, EventType.LOAD,\n          this.handleImageLoad_, this)\n      ];\n      this.tileLoadFunction_(this, this.src_);\n    }\n  }\n\n  /**\n   * Discards event handlers which listen for load completion or errors.\n   *\n   * @private\n   */\n  unlistenImage_() {\n    this.imageListenerKeys_.forEach(unlistenByKey);\n    this.imageListenerKeys_ = null;\n  }\n}\n\n\n/**\n * Get a 1-pixel blank image.\n * @return {HTMLCanvasElement} Blank image.\n */\nfunction getBlankImage() {\n  const ctx = createCanvasContext2D(1, 1);\n  ctx.fillStyle = 'rgba(0,0,0,0)';\n  ctx.fillRect(0, 0, 1, 1);\n  return ctx.canvas;\n}\n\nexport default ImageTile;\n","/**\n * @module ol/TileCache\n */\nimport LRUCache from './structs/LRUCache.js';\nimport {fromKey, getKey} from './tilecoord.js';\n\nclass TileCache extends LRUCache {\n\n  /**\n   * @param {number=} opt_highWaterMark High water mark.\n   */\n  constructor(opt_highWaterMark) {\n\n    super(opt_highWaterMark);\n\n  }\n\n  /**\n   * @param {!Object<string, module:ol/TileRange>} usedTiles Used tiles.\n   */\n  expireCache(usedTiles) {\n    while (this.canExpireCache()) {\n      const tile = this.peekLast();\n      const zKey = tile.tileCoord[0].toString();\n      if (zKey in usedTiles && usedTiles[zKey].contains(tile.tileCoord)) {\n        break;\n      } else {\n        this.pop().dispose();\n      }\n    }\n  }\n\n  /**\n   * Prune all tiles from the cache that don't have the same z as the newest tile.\n   */\n  pruneExceptNewestZ() {\n    if (this.getCount() === 0) {\n      return;\n    }\n    const key = this.peekFirstKey();\n    const tileCoord = fromKey(key);\n    const z = tileCoord[0];\n    this.forEach(function(tile) {\n      if (tile.tileCoord[0] !== z) {\n        this.remove(getKey(tile.tileCoord));\n        tile.dispose();\n      }\n    }, this);\n  }\n}\n\n\nexport default TileCache;\n","/**\n * @module ol/reproj\n */\nimport {createCanvasContext2D} from './dom.js';\nimport {containsCoordinate, createEmpty, extend, getHeight, getTopLeft, getWidth} from './extent.js';\nimport {solveLinearSystem} from './math.js';\nimport {getPointResolution, transform} from './proj.js';\n\n\n/**\n * Calculates ideal resolution to use from the source in order to achieve\n * pixel mapping as close as possible to 1:1 during reprojection.\n * The resolution is calculated regardless of what resolutions\n * are actually available in the dataset (TileGrid, Image, ...).\n *\n * @param {module:ol/proj/Projection} sourceProj Source projection.\n * @param {module:ol/proj/Projection} targetProj Target projection.\n * @param {module:ol/coordinate~Coordinate} targetCenter Target center.\n * @param {number} targetResolution Target resolution.\n * @return {number} The best resolution to use. Can be +-Infinity, NaN or 0.\n */\nexport function calculateSourceResolution(sourceProj, targetProj,\n  targetCenter, targetResolution) {\n\n  const sourceCenter = transform(targetCenter, targetProj, sourceProj);\n\n  // calculate the ideal resolution of the source data\n  let sourceResolution = getPointResolution(targetProj, targetResolution, targetCenter);\n\n  const targetMetersPerUnit = targetProj.getMetersPerUnit();\n  if (targetMetersPerUnit !== undefined) {\n    sourceResolution *= targetMetersPerUnit;\n  }\n  const sourceMetersPerUnit = sourceProj.getMetersPerUnit();\n  if (sourceMetersPerUnit !== undefined) {\n    sourceResolution /= sourceMetersPerUnit;\n  }\n\n  // Based on the projection properties, the point resolution at the specified\n  // coordinates may be slightly different. We need to reverse-compensate this\n  // in order to achieve optimal results.\n\n  const sourceExtent = sourceProj.getExtent();\n  if (!sourceExtent || containsCoordinate(sourceExtent, sourceCenter)) {\n    const compensationFactor = getPointResolution(sourceProj, sourceResolution, sourceCenter) /\n        sourceResolution;\n    if (isFinite(compensationFactor) && compensationFactor > 0) {\n      sourceResolution /= compensationFactor;\n    }\n  }\n\n  return sourceResolution;\n}\n\n\n/**\n * Enlarge the clipping triangle point by 1 pixel to ensure the edges overlap\n * in order to mask gaps caused by antialiasing.\n *\n * @param {number} centroidX Centroid of the triangle (x coordinate in pixels).\n * @param {number} centroidY Centroid of the triangle (y coordinate in pixels).\n * @param {number} x X coordinate of the point (in pixels).\n * @param {number} y Y coordinate of the point (in pixels).\n * @return {module:ol/coordinate~Coordinate} New point 1 px farther from the centroid.\n */\nfunction enlargeClipPoint(centroidX, centroidY, x, y) {\n  const dX = x - centroidX;\n  const dY = y - centroidY;\n  const distance = Math.sqrt(dX * dX + dY * dY);\n  return [Math.round(x + dX / distance), Math.round(y + dY / distance)];\n}\n\n\n/**\n * Renders the source data into new canvas based on the triangulation.\n *\n * @param {number} width Width of the canvas.\n * @param {number} height Height of the canvas.\n * @param {number} pixelRatio Pixel ratio.\n * @param {number} sourceResolution Source resolution.\n * @param {module:ol/extent~Extent} sourceExtent Extent of the data source.\n * @param {number} targetResolution Target resolution.\n * @param {module:ol/extent~Extent} targetExtent Target extent.\n * @param {module:ol/reproj/Triangulation} triangulation\n * Calculated triangulation.\n * @param {Array<{extent: module:ol/extent~Extent,\n *                 image: (HTMLCanvasElement|HTMLImageElement|HTMLVideoElement)}>} sources\n * Array of sources.\n * @param {number} gutter Gutter of the sources.\n * @param {boolean=} opt_renderEdges Render reprojection edges.\n * @return {HTMLCanvasElement} Canvas with reprojected data.\n */\nexport function render(width, height, pixelRatio,\n  sourceResolution, sourceExtent, targetResolution, targetExtent,\n  triangulation, sources, gutter, opt_renderEdges) {\n\n  const context = createCanvasContext2D(Math.round(pixelRatio * width),\n    Math.round(pixelRatio * height));\n\n  if (sources.length === 0) {\n    return context.canvas;\n  }\n\n  context.scale(pixelRatio, pixelRatio);\n\n  const sourceDataExtent = createEmpty();\n  sources.forEach(function(src, i, arr) {\n    extend(sourceDataExtent, src.extent);\n  });\n\n  const canvasWidthInUnits = getWidth(sourceDataExtent);\n  const canvasHeightInUnits = getHeight(sourceDataExtent);\n  const stitchContext = createCanvasContext2D(\n    Math.round(pixelRatio * canvasWidthInUnits / sourceResolution),\n    Math.round(pixelRatio * canvasHeightInUnits / sourceResolution));\n\n  const stitchScale = pixelRatio / sourceResolution;\n\n  sources.forEach(function(src, i, arr) {\n    const xPos = src.extent[0] - sourceDataExtent[0];\n    const yPos = -(src.extent[3] - sourceDataExtent[3]);\n    const srcWidth = getWidth(src.extent);\n    const srcHeight = getHeight(src.extent);\n\n    stitchContext.drawImage(\n      src.image,\n      gutter, gutter,\n      src.image.width - 2 * gutter, src.image.height - 2 * gutter,\n      xPos * stitchScale, yPos * stitchScale,\n      srcWidth * stitchScale, srcHeight * stitchScale);\n  });\n\n  const targetTopLeft = getTopLeft(targetExtent);\n\n  triangulation.getTriangles().forEach(function(triangle, i, arr) {\n    /* Calculate affine transform (src -> dst)\n     * Resulting matrix can be used to transform coordinate\n     * from `sourceProjection` to destination pixels.\n     *\n     * To optimize number of context calls and increase numerical stability,\n     * we also do the following operations:\n     * trans(-topLeftExtentCorner), scale(1 / targetResolution), scale(1, -1)\n     * here before solving the linear system so [ui, vi] are pixel coordinates.\n     *\n     * Src points: xi, yi\n     * Dst points: ui, vi\n     * Affine coefficients: aij\n     *\n     * | x0 y0 1  0  0 0 |   |a00|   |u0|\n     * | x1 y1 1  0  0 0 |   |a01|   |u1|\n     * | x2 y2 1  0  0 0 | x |a02| = |u2|\n     * |  0  0 0 x0 y0 1 |   |a10|   |v0|\n     * |  0  0 0 x1 y1 1 |   |a11|   |v1|\n     * |  0  0 0 x2 y2 1 |   |a12|   |v2|\n     */\n    const source = triangle.source;\n    const target = triangle.target;\n    let x0 = source[0][0], y0 = source[0][1];\n    let x1 = source[1][0], y1 = source[1][1];\n    let x2 = source[2][0], y2 = source[2][1];\n    const u0 = (target[0][0] - targetTopLeft[0]) / targetResolution;\n    const v0 = -(target[0][1] - targetTopLeft[1]) / targetResolution;\n    const u1 = (target[1][0] - targetTopLeft[0]) / targetResolution;\n    const v1 = -(target[1][1] - targetTopLeft[1]) / targetResolution;\n    const u2 = (target[2][0] - targetTopLeft[0]) / targetResolution;\n    const v2 = -(target[2][1] - targetTopLeft[1]) / targetResolution;\n\n    // Shift all the source points to improve numerical stability\n    // of all the subsequent calculations. The [x0, y0] is used here.\n    // This is also used to simplify the linear system.\n    const sourceNumericalShiftX = x0;\n    const sourceNumericalShiftY = y0;\n    x0 = 0;\n    y0 = 0;\n    x1 -= sourceNumericalShiftX;\n    y1 -= sourceNumericalShiftY;\n    x2 -= sourceNumericalShiftX;\n    y2 -= sourceNumericalShiftY;\n\n    const augmentedMatrix = [\n      [x1, y1, 0, 0, u1 - u0],\n      [x2, y2, 0, 0, u2 - u0],\n      [0, 0, x1, y1, v1 - v0],\n      [0, 0, x2, y2, v2 - v0]\n    ];\n    const affineCoefs = solveLinearSystem(augmentedMatrix);\n    if (!affineCoefs) {\n      return;\n    }\n\n    context.save();\n    context.beginPath();\n    const centroidX = (u0 + u1 + u2) / 3;\n    const centroidY = (v0 + v1 + v2) / 3;\n    const p0 = enlargeClipPoint(centroidX, centroidY, u0, v0);\n    const p1 = enlargeClipPoint(centroidX, centroidY, u1, v1);\n    const p2 = enlargeClipPoint(centroidX, centroidY, u2, v2);\n\n    context.moveTo(p1[0], p1[1]);\n    context.lineTo(p0[0], p0[1]);\n    context.lineTo(p2[0], p2[1]);\n    context.clip();\n\n    context.transform(\n      affineCoefs[0], affineCoefs[2], affineCoefs[1], affineCoefs[3], u0, v0);\n\n    context.translate(sourceDataExtent[0] - sourceNumericalShiftX,\n      sourceDataExtent[3] - sourceNumericalShiftY);\n\n    context.scale(sourceResolution / pixelRatio,\n      -sourceResolution / pixelRatio);\n\n    context.drawImage(stitchContext.canvas, 0, 0);\n    context.restore();\n  });\n\n  if (opt_renderEdges) {\n    context.save();\n\n    context.strokeStyle = 'black';\n    context.lineWidth = 1;\n\n    triangulation.getTriangles().forEach(function(triangle, i, arr) {\n      const target = triangle.target;\n      const u0 = (target[0][0] - targetTopLeft[0]) / targetResolution;\n      const v0 = -(target[0][1] - targetTopLeft[1]) / targetResolution;\n      const u1 = (target[1][0] - targetTopLeft[0]) / targetResolution;\n      const v1 = -(target[1][1] - targetTopLeft[1]) / targetResolution;\n      const u2 = (target[2][0] - targetTopLeft[0]) / targetResolution;\n      const v2 = -(target[2][1] - targetTopLeft[1]) / targetResolution;\n\n      context.beginPath();\n      context.moveTo(u1, v1);\n      context.lineTo(u0, v0);\n      context.lineTo(u2, v2);\n      context.closePath();\n      context.stroke();\n    });\n\n    context.restore();\n  }\n  return context.canvas;\n}\n","/**\n * @module ol/reproj/Triangulation\n */\nimport {boundingExtent, createEmpty, extendCoordinate, getBottomLeft, getBottomRight,\n  getTopLeft, getTopRight, getWidth, intersects} from '../extent.js';\nimport {modulo} from '../math.js';\nimport {getTransform} from '../proj.js';\n\n\n/**\n * Single triangle; consists of 3 source points and 3 target points.\n * @typedef {Object} Triangle\n * @property {Array<module:ol/coordinate~Coordinate>} source\n * @property {Array<module:ol/coordinate~Coordinate>} target\n */\n\n\n/**\n * Maximum number of subdivision steps during raster reprojection triangulation.\n * Prevents high memory usage and large number of proj4 calls (for certain\n * transformations and areas). At most `2*(2^this)` triangles are created for\n * each triangulated extent (tile/image).\n * @type {number}\n */\nconst MAX_SUBDIVISION = 10;\n\n\n/**\n * Maximum allowed size of triangle relative to world width. When transforming\n * corners of world extent between certain projections, the resulting\n * triangulation seems to have zero error and no subdivision is performed. If\n * the triangle width is more than this (relative to world width; 0-1),\n * subdivison is forced (up to `MAX_SUBDIVISION`). Default is `0.25`.\n * @type {number}\n */\nconst MAX_TRIANGLE_WIDTH = 0.25;\n\n\n/**\n * @classdesc\n * Class containing triangulation of the given target extent.\n * Used for determining source data and the reprojection itself.\n */\nclass Triangulation {\n\n  /**\n   * @param {module:ol/proj/Projection} sourceProj Source projection.\n   * @param {module:ol/proj/Projection} targetProj Target projection.\n   * @param {module:ol/extent~Extent} targetExtent Target extent to triangulate.\n   * @param {module:ol/extent~Extent} maxSourceExtent Maximal source extent that can be used.\n   * @param {number} errorThreshold Acceptable error (in source units).\n   */\n  constructor(sourceProj, targetProj, targetExtent, maxSourceExtent, errorThreshold) {\n\n    /**\n     * @type {module:ol/proj/Projection}\n     * @private\n     */\n    this.sourceProj_ = sourceProj;\n\n    /**\n     * @type {module:ol/proj/Projection}\n     * @private\n     */\n    this.targetProj_ = targetProj;\n\n    /** @type {!Object<string, module:ol/coordinate~Coordinate>} */\n    let transformInvCache = {};\n    const transformInv = getTransform(this.targetProj_, this.sourceProj_);\n\n    /**\n     * @param {module:ol/coordinate~Coordinate} c A coordinate.\n     * @return {module:ol/coordinate~Coordinate} Transformed coordinate.\n     * @private\n     */\n    this.transformInv_ = function(c) {\n      const key = c[0] + '/' + c[1];\n      if (!transformInvCache[key]) {\n        transformInvCache[key] = transformInv(c);\n      }\n      return transformInvCache[key];\n    };\n\n    /**\n     * @type {module:ol/extent~Extent}\n     * @private\n     */\n    this.maxSourceExtent_ = maxSourceExtent;\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.errorThresholdSquared_ = errorThreshold * errorThreshold;\n\n    /**\n     * @type {Array<module:ol/reproj/Triangulation~Triangle>}\n     * @private\n     */\n    this.triangles_ = [];\n\n    /**\n     * Indicates that the triangulation crosses edge of the source projection.\n     * @type {boolean}\n     * @private\n     */\n    this.wrapsXInSource_ = false;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.canWrapXInSource_ = this.sourceProj_.canWrapX() &&\n        !!maxSourceExtent &&\n        !!this.sourceProj_.getExtent() &&\n        (getWidth(maxSourceExtent) == getWidth(this.sourceProj_.getExtent()));\n\n    /**\n     * @type {?number}\n     * @private\n     */\n    this.sourceWorldWidth_ = this.sourceProj_.getExtent() ?\n      getWidth(this.sourceProj_.getExtent()) : null;\n\n    /**\n     * @type {?number}\n     * @private\n     */\n    this.targetWorldWidth_ = this.targetProj_.getExtent() ?\n      getWidth(this.targetProj_.getExtent()) : null;\n\n    const destinationTopLeft = getTopLeft(targetExtent);\n    const destinationTopRight = getTopRight(targetExtent);\n    const destinationBottomRight = getBottomRight(targetExtent);\n    const destinationBottomLeft = getBottomLeft(targetExtent);\n    const sourceTopLeft = this.transformInv_(destinationTopLeft);\n    const sourceTopRight = this.transformInv_(destinationTopRight);\n    const sourceBottomRight = this.transformInv_(destinationBottomRight);\n    const sourceBottomLeft = this.transformInv_(destinationBottomLeft);\n\n    this.addQuad_(\n      destinationTopLeft, destinationTopRight,\n      destinationBottomRight, destinationBottomLeft,\n      sourceTopLeft, sourceTopRight, sourceBottomRight, sourceBottomLeft,\n      MAX_SUBDIVISION);\n\n    if (this.wrapsXInSource_) {\n      let leftBound = Infinity;\n      this.triangles_.forEach(function(triangle, i, arr) {\n        leftBound = Math.min(leftBound,\n          triangle.source[0][0], triangle.source[1][0], triangle.source[2][0]);\n      });\n\n      // Shift triangles to be as close to `leftBound` as possible\n      // (if the distance is more than `worldWidth / 2` it can be closer.\n      this.triangles_.forEach(function(triangle) {\n        if (Math.max(triangle.source[0][0], triangle.source[1][0],\n          triangle.source[2][0]) - leftBound > this.sourceWorldWidth_ / 2) {\n          const newTriangle = [[triangle.source[0][0], triangle.source[0][1]],\n            [triangle.source[1][0], triangle.source[1][1]],\n            [triangle.source[2][0], triangle.source[2][1]]];\n          if ((newTriangle[0][0] - leftBound) > this.sourceWorldWidth_ / 2) {\n            newTriangle[0][0] -= this.sourceWorldWidth_;\n          }\n          if ((newTriangle[1][0] - leftBound) > this.sourceWorldWidth_ / 2) {\n            newTriangle[1][0] -= this.sourceWorldWidth_;\n          }\n          if ((newTriangle[2][0] - leftBound) > this.sourceWorldWidth_ / 2) {\n            newTriangle[2][0] -= this.sourceWorldWidth_;\n          }\n\n          // Rarely (if the extent contains both the dateline and prime meridian)\n          // the shift can in turn break some triangles.\n          // Detect this here and don't shift in such cases.\n          const minX = Math.min(\n            newTriangle[0][0], newTriangle[1][0], newTriangle[2][0]);\n          const maxX = Math.max(\n            newTriangle[0][0], newTriangle[1][0], newTriangle[2][0]);\n          if ((maxX - minX) < this.sourceWorldWidth_ / 2) {\n            triangle.source = newTriangle;\n          }\n        }\n      }.bind(this));\n    }\n\n    transformInvCache = {};\n  }\n\n  /**\n   * Adds triangle to the triangulation.\n   * @param {module:ol/coordinate~Coordinate} a The target a coordinate.\n   * @param {module:ol/coordinate~Coordinate} b The target b coordinate.\n   * @param {module:ol/coordinate~Coordinate} c The target c coordinate.\n   * @param {module:ol/coordinate~Coordinate} aSrc The source a coordinate.\n   * @param {module:ol/coordinate~Coordinate} bSrc The source b coordinate.\n   * @param {module:ol/coordinate~Coordinate} cSrc The source c coordinate.\n   * @private\n   */\n  addTriangle_(a, b, c, aSrc, bSrc, cSrc) {\n    this.triangles_.push({\n      source: [aSrc, bSrc, cSrc],\n      target: [a, b, c]\n    });\n  }\n\n  /**\n   * Adds quad (points in clock-wise order) to the triangulation\n   * (and reprojects the vertices) if valid.\n   * Performs quad subdivision if needed to increase precision.\n   *\n   * @param {module:ol/coordinate~Coordinate} a The target a coordinate.\n   * @param {module:ol/coordinate~Coordinate} b The target b coordinate.\n   * @param {module:ol/coordinate~Coordinate} c The target c coordinate.\n   * @param {module:ol/coordinate~Coordinate} d The target d coordinate.\n   * @param {module:ol/coordinate~Coordinate} aSrc The source a coordinate.\n   * @param {module:ol/coordinate~Coordinate} bSrc The source b coordinate.\n   * @param {module:ol/coordinate~Coordinate} cSrc The source c coordinate.\n   * @param {module:ol/coordinate~Coordinate} dSrc The source d coordinate.\n   * @param {number} maxSubdivision Maximal allowed subdivision of the quad.\n   * @private\n   */\n  addQuad_(a, b, c, d, aSrc, bSrc, cSrc, dSrc, maxSubdivision) {\n\n    const sourceQuadExtent = boundingExtent([aSrc, bSrc, cSrc, dSrc]);\n    const sourceCoverageX = this.sourceWorldWidth_ ?\n      getWidth(sourceQuadExtent) / this.sourceWorldWidth_ : null;\n    const sourceWorldWidth = /** @type {number} */ (this.sourceWorldWidth_);\n\n    // when the quad is wrapped in the source projection\n    // it covers most of the projection extent, but not fully\n    const wrapsX = this.sourceProj_.canWrapX() &&\n                 sourceCoverageX > 0.5 && sourceCoverageX < 1;\n\n    let needsSubdivision = false;\n\n    if (maxSubdivision > 0) {\n      if (this.targetProj_.isGlobal() && this.targetWorldWidth_) {\n        const targetQuadExtent = boundingExtent([a, b, c, d]);\n        const targetCoverageX = getWidth(targetQuadExtent) / this.targetWorldWidth_;\n        needsSubdivision |=\n            targetCoverageX > MAX_TRIANGLE_WIDTH;\n      }\n      if (!wrapsX && this.sourceProj_.isGlobal() && sourceCoverageX) {\n        needsSubdivision |=\n            sourceCoverageX > MAX_TRIANGLE_WIDTH;\n      }\n    }\n\n    if (!needsSubdivision && this.maxSourceExtent_) {\n      if (!intersects(sourceQuadExtent, this.maxSourceExtent_)) {\n        // whole quad outside source projection extent -> ignore\n        return;\n      }\n    }\n\n    if (!needsSubdivision) {\n      if (!isFinite(aSrc[0]) || !isFinite(aSrc[1]) ||\n          !isFinite(bSrc[0]) || !isFinite(bSrc[1]) ||\n          !isFinite(cSrc[0]) || !isFinite(cSrc[1]) ||\n          !isFinite(dSrc[0]) || !isFinite(dSrc[1])) {\n        if (maxSubdivision > 0) {\n          needsSubdivision = true;\n        } else {\n          return;\n        }\n      }\n    }\n\n    if (maxSubdivision > 0) {\n      if (!needsSubdivision) {\n        const center = [(a[0] + c[0]) / 2, (a[1] + c[1]) / 2];\n        const centerSrc = this.transformInv_(center);\n\n        let dx;\n        if (wrapsX) {\n          const centerSrcEstimX =\n              (modulo(aSrc[0], sourceWorldWidth) +\n               modulo(cSrc[0], sourceWorldWidth)) / 2;\n          dx = centerSrcEstimX -\n              modulo(centerSrc[0], sourceWorldWidth);\n        } else {\n          dx = (aSrc[0] + cSrc[0]) / 2 - centerSrc[0];\n        }\n        const dy = (aSrc[1] + cSrc[1]) / 2 - centerSrc[1];\n        const centerSrcErrorSquared = dx * dx + dy * dy;\n        needsSubdivision = centerSrcErrorSquared > this.errorThresholdSquared_;\n      }\n      if (needsSubdivision) {\n        if (Math.abs(a[0] - c[0]) <= Math.abs(a[1] - c[1])) {\n          // split horizontally (top & bottom)\n          const bc = [(b[0] + c[0]) / 2, (b[1] + c[1]) / 2];\n          const bcSrc = this.transformInv_(bc);\n          const da = [(d[0] + a[0]) / 2, (d[1] + a[1]) / 2];\n          const daSrc = this.transformInv_(da);\n\n          this.addQuad_(\n            a, b, bc, da, aSrc, bSrc, bcSrc, daSrc, maxSubdivision - 1);\n          this.addQuad_(\n            da, bc, c, d, daSrc, bcSrc, cSrc, dSrc, maxSubdivision - 1);\n        } else {\n          // split vertically (left & right)\n          const ab = [(a[0] + b[0]) / 2, (a[1] + b[1]) / 2];\n          const abSrc = this.transformInv_(ab);\n          const cd = [(c[0] + d[0]) / 2, (c[1] + d[1]) / 2];\n          const cdSrc = this.transformInv_(cd);\n\n          this.addQuad_(\n            a, ab, cd, d, aSrc, abSrc, cdSrc, dSrc, maxSubdivision - 1);\n          this.addQuad_(\n            ab, b, c, cd, abSrc, bSrc, cSrc, cdSrc, maxSubdivision - 1);\n        }\n        return;\n      }\n    }\n\n    if (wrapsX) {\n      if (!this.canWrapXInSource_) {\n        return;\n      }\n      this.wrapsXInSource_ = true;\n    }\n\n    this.addTriangle_(a, c, d, aSrc, cSrc, dSrc);\n    this.addTriangle_(a, b, c, aSrc, bSrc, cSrc);\n  }\n\n  /**\n   * Calculates extent of the 'source' coordinates from all the triangles.\n   *\n   * @return {module:ol/extent~Extent} Calculated extent.\n   */\n  calculateSourceExtent() {\n    const extent = createEmpty();\n\n    this.triangles_.forEach(function(triangle, i, arr) {\n      const src = triangle.source;\n      extendCoordinate(extent, src[0]);\n      extendCoordinate(extent, src[1]);\n      extendCoordinate(extent, src[2]);\n    });\n\n    return extent;\n  }\n\n  /**\n   * @return {Array<module:ol/reproj/Triangulation~Triangle>} Array of the calculated triangles.\n   */\n  getTriangles() {\n    return this.triangles_;\n  }\n}\n\nexport default Triangulation;\n","/**\n * @module ol/reproj/Tile\n */\nimport {ERROR_THRESHOLD} from './common.js';\n\nimport Tile from '../Tile.js';\nimport TileState from '../TileState.js';\nimport {listen, unlistenByKey} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {getArea, getCenter, getIntersection} from '../extent.js';\nimport {clamp} from '../math.js';\nimport {calculateSourceResolution, render as renderReprojected} from '../reproj.js';\nimport Triangulation from '../reproj/Triangulation.js';\n\n\n/**\n * @typedef {function(number, number, number, number) : module:ol/Tile} FunctionType\n */\n\n\n/**\n * @classdesc\n * Class encapsulating single reprojected tile.\n * See {@link module:ol/source/TileImage~TileImage}.\n *\n */\nclass ReprojTile extends Tile {\n  /**\n   * @param {module:ol/proj/Projection} sourceProj Source projection.\n   * @param {module:ol/tilegrid/TileGrid} sourceTileGrid Source tile grid.\n   * @param {module:ol/proj/Projection} targetProj Target projection.\n   * @param {module:ol/tilegrid/TileGrid} targetTileGrid Target tile grid.\n   * @param {module:ol/tilecoord~TileCoord} tileCoord Coordinate of the tile.\n   * @param {module:ol/tilecoord~TileCoord} wrappedTileCoord Coordinate of the tile wrapped in X.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {number} gutter Gutter of the source tiles.\n   * @param {module:ol/reproj/Tile~FunctionType} getTileFunction\n   *     Function returning source tiles (z, x, y, pixelRatio).\n   * @param {number=} opt_errorThreshold Acceptable reprojection error (in px).\n   * @param {boolean=} opt_renderEdges Render reprojection edges.\n   */\n  constructor(\n    sourceProj,\n    sourceTileGrid,\n    targetProj,\n    targetTileGrid,\n    tileCoord,\n    wrappedTileCoord,\n    pixelRatio,\n    gutter,\n    getTileFunction,\n    opt_errorThreshold,\n    opt_renderEdges\n  ) {\n    super(tileCoord, TileState.IDLE);\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.renderEdges_ = opt_renderEdges !== undefined ? opt_renderEdges : false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.pixelRatio_ = pixelRatio;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.gutter_ = gutter;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement}\n     */\n    this.canvas_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/tilegrid/TileGrid}\n     */\n    this.sourceTileGrid_ = sourceTileGrid;\n\n    /**\n     * @private\n     * @type {module:ol/tilegrid/TileGrid}\n     */\n    this.targetTileGrid_ = targetTileGrid;\n\n    /**\n     * @private\n     * @type {module:ol/tilecoord~TileCoord}\n     */\n    this.wrappedTileCoord_ = wrappedTileCoord ? wrappedTileCoord : tileCoord;\n\n    /**\n     * @private\n     * @type {!Array<module:ol/Tile>}\n     */\n    this.sourceTiles_ = [];\n\n    /**\n     * @private\n     * @type {Array<module:ol/events~EventsKey>}\n     */\n    this.sourcesListenerKeys_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.sourceZ_ = 0;\n\n    const targetExtent = targetTileGrid.getTileCoordExtent(this.wrappedTileCoord_);\n    const maxTargetExtent = this.targetTileGrid_.getExtent();\n    let maxSourceExtent = this.sourceTileGrid_.getExtent();\n\n    const limitedTargetExtent = maxTargetExtent ?\n      getIntersection(targetExtent, maxTargetExtent) : targetExtent;\n\n    if (getArea(limitedTargetExtent) === 0) {\n      // Tile is completely outside range -> EMPTY\n      // TODO: is it actually correct that the source even creates the tile ?\n      this.state = TileState.EMPTY;\n      return;\n    }\n\n    const sourceProjExtent = sourceProj.getExtent();\n    if (sourceProjExtent) {\n      if (!maxSourceExtent) {\n        maxSourceExtent = sourceProjExtent;\n      } else {\n        maxSourceExtent = getIntersection(maxSourceExtent, sourceProjExtent);\n      }\n    }\n\n    const targetResolution = targetTileGrid.getResolution(\n      this.wrappedTileCoord_[0]);\n\n    const targetCenter = getCenter(limitedTargetExtent);\n    const sourceResolution = calculateSourceResolution(\n      sourceProj, targetProj, targetCenter, targetResolution);\n\n    if (!isFinite(sourceResolution) || sourceResolution <= 0) {\n      // invalid sourceResolution -> EMPTY\n      // probably edges of the projections when no extent is defined\n      this.state = TileState.EMPTY;\n      return;\n    }\n\n    const errorThresholdInPixels = opt_errorThreshold !== undefined ?\n      opt_errorThreshold : ERROR_THRESHOLD;\n\n    /**\n     * @private\n     * @type {!module:ol/reproj/Triangulation}\n     */\n    this.triangulation_ = new Triangulation(\n      sourceProj, targetProj, limitedTargetExtent, maxSourceExtent,\n      sourceResolution * errorThresholdInPixels);\n\n    if (this.triangulation_.getTriangles().length === 0) {\n      // no valid triangles -> EMPTY\n      this.state = TileState.EMPTY;\n      return;\n    }\n\n    this.sourceZ_ = sourceTileGrid.getZForResolution(sourceResolution);\n    let sourceExtent = this.triangulation_.calculateSourceExtent();\n\n    if (maxSourceExtent) {\n      if (sourceProj.canWrapX()) {\n        sourceExtent[1] = clamp(\n          sourceExtent[1], maxSourceExtent[1], maxSourceExtent[3]);\n        sourceExtent[3] = clamp(\n          sourceExtent[3], maxSourceExtent[1], maxSourceExtent[3]);\n      } else {\n        sourceExtent = getIntersection(sourceExtent, maxSourceExtent);\n      }\n    }\n\n    if (!getArea(sourceExtent)) {\n      this.state = TileState.EMPTY;\n    } else {\n      const sourceRange = sourceTileGrid.getTileRangeForExtentAndZ(\n        sourceExtent, this.sourceZ_);\n\n      for (let srcX = sourceRange.minX; srcX <= sourceRange.maxX; srcX++) {\n        for (let srcY = sourceRange.minY; srcY <= sourceRange.maxY; srcY++) {\n          const tile = getTileFunction(this.sourceZ_, srcX, srcY, pixelRatio);\n          if (tile) {\n            this.sourceTiles_.push(tile);\n          }\n        }\n      }\n\n      if (this.sourceTiles_.length === 0) {\n        this.state = TileState.EMPTY;\n      }\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    if (this.state == TileState.LOADING) {\n      this.unlistenSources_();\n    }\n    super.disposeInternal();\n  }\n\n  /**\n   * Get the HTML Canvas element for this tile.\n   * @return {HTMLCanvasElement} Canvas.\n   */\n  getImage() {\n    return this.canvas_;\n  }\n\n  /**\n   * @private\n   */\n  reproject_() {\n    const sources = [];\n    this.sourceTiles_.forEach(function(tile, i, arr) {\n      if (tile && tile.getState() == TileState.LOADED) {\n        sources.push({\n          extent: this.sourceTileGrid_.getTileCoordExtent(tile.tileCoord),\n          image: tile.getImage()\n        });\n      }\n    }.bind(this));\n    this.sourceTiles_.length = 0;\n\n    if (sources.length === 0) {\n      this.state = TileState.ERROR;\n    } else {\n      const z = this.wrappedTileCoord_[0];\n      const size = this.targetTileGrid_.getTileSize(z);\n      const width = typeof size === 'number' ? size : size[0];\n      const height = typeof size === 'number' ? size : size[1];\n      const targetResolution = this.targetTileGrid_.getResolution(z);\n      const sourceResolution = this.sourceTileGrid_.getResolution(this.sourceZ_);\n\n      const targetExtent = this.targetTileGrid_.getTileCoordExtent(\n        this.wrappedTileCoord_);\n      this.canvas_ = renderReprojected(width, height, this.pixelRatio_,\n        sourceResolution, this.sourceTileGrid_.getExtent(),\n        targetResolution, targetExtent, this.triangulation_, sources,\n        this.gutter_, this.renderEdges_);\n\n      this.state = TileState.LOADED;\n    }\n    this.changed();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  load() {\n    if (this.state == TileState.IDLE) {\n      this.state = TileState.LOADING;\n      this.changed();\n\n      let leftToLoad = 0;\n\n      this.sourcesListenerKeys_ = [];\n      this.sourceTiles_.forEach(function(tile, i, arr) {\n        const state = tile.getState();\n        if (state == TileState.IDLE || state == TileState.LOADING) {\n          leftToLoad++;\n\n          const sourceListenKey = listen(tile, EventType.CHANGE,\n            function(e) {\n              const state = tile.getState();\n              if (state == TileState.LOADED ||\n                    state == TileState.ERROR ||\n                    state == TileState.EMPTY) {\n                unlistenByKey(sourceListenKey);\n                leftToLoad--;\n                if (leftToLoad === 0) {\n                  this.unlistenSources_();\n                  this.reproject_();\n                }\n              }\n            }, this);\n          this.sourcesListenerKeys_.push(sourceListenKey);\n        }\n      }.bind(this));\n\n      this.sourceTiles_.forEach(function(tile, i, arr) {\n        const state = tile.getState();\n        if (state == TileState.IDLE) {\n          tile.load();\n        }\n      });\n\n      if (leftToLoad === 0) {\n        setTimeout(this.reproject_.bind(this), 0);\n      }\n    }\n  }\n\n  /**\n   * @private\n   */\n  unlistenSources_() {\n    this.sourcesListenerKeys_.forEach(unlistenByKey);\n    this.sourcesListenerKeys_ = null;\n  }\n}\n\n\nexport default ReprojTile;\n","/**\n * @module ol/source/Tile\n */\n\nimport {VOID} from '../functions.js';\nimport TileCache from '../TileCache.js';\nimport TileState from '../TileState.js';\nimport Event from '../events/Event.js';\nimport {equivalent} from '../proj.js';\nimport {toSize, scale as scaleSize} from '../size.js';\nimport Source from '../source/Source.js';\nimport {getKeyZXY, withinExtentAndZ} from '../tilecoord.js';\nimport {wrapX, getForProjection as getTileGridForProjection} from '../tilegrid.js';\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/source/Source~AttributionLike} [attributions]\n * @property {number} [cacheSize]\n * @property {module:ol/extent~Extent} [extent]\n * @property {boolean} [opaque]\n * @property {number} [tilePixelRatio]\n * @property {module:ol/proj~ProjectionLike} [projection]\n * @property {module:ol/source/State} [state]\n * @property {module:ol/tilegrid/TileGrid} [tileGrid]\n * @property {boolean} [wrapX=true]\n * @property {number} [transition]\n */\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * Base class for sources providing images divided into a tile grid.\n * @api\n */\nclass TileSource extends Source {\n  /**\n   * @param {module:ol/source/Tile~Options=} options SourceTile source options.\n   */\n  constructor(options) {\n\n    super({\n      attributions: options.attributions,\n      extent: options.extent,\n      projection: options.projection,\n      state: options.state,\n      wrapX: options.wrapX\n    });\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.opaque_ = options.opaque !== undefined ? options.opaque : false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.tilePixelRatio_ = options.tilePixelRatio !== undefined ?\n      options.tilePixelRatio : 1;\n\n    /**\n     * @protected\n     * @type {module:ol/tilegrid/TileGrid}\n     */\n    this.tileGrid = options.tileGrid !== undefined ? options.tileGrid : null;\n\n    /**\n     * @protected\n     * @type {module:ol/TileCache}\n     */\n    this.tileCache = new TileCache(options.cacheSize);\n\n    /**\n     * @protected\n     * @type {module:ol/size~Size}\n     */\n    this.tmpSize = [0, 0];\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.key_ = '';\n\n    /**\n     * @protected\n     * @type {module:ol/Tile~Options}\n     */\n    this.tileOptions = {transition: options.transition};\n\n  }\n\n  /**\n   * @return {boolean} Can expire cache.\n   */\n  canExpireCache() {\n    return this.tileCache.canExpireCache();\n  }\n\n  /**\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @param {!Object<string, module:ol/TileRange>} usedTiles Used tiles.\n   */\n  expireCache(projection, usedTiles) {\n    const tileCache = this.getTileCacheForProjection(projection);\n    if (tileCache) {\n      tileCache.expireCache(usedTiles);\n    }\n  }\n\n  /**\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @param {number} z Zoom level.\n   * @param {module:ol/TileRange} tileRange Tile range.\n   * @param {function(module:ol/Tile):(boolean|undefined)} callback Called with each\n   *     loaded tile.  If the callback returns `false`, the tile will not be\n   *     considered loaded.\n   * @return {boolean} The tile range is fully covered with loaded tiles.\n   */\n  forEachLoadedTile(projection, z, tileRange, callback) {\n    const tileCache = this.getTileCacheForProjection(projection);\n    if (!tileCache) {\n      return false;\n    }\n\n    let covered = true;\n    let tile, tileCoordKey, loaded;\n    for (let x = tileRange.minX; x <= tileRange.maxX; ++x) {\n      for (let y = tileRange.minY; y <= tileRange.maxY; ++y) {\n        tileCoordKey = getKeyZXY(z, x, y);\n        loaded = false;\n        if (tileCache.containsKey(tileCoordKey)) {\n          tile = /** @type {!module:ol/Tile} */ (tileCache.get(tileCoordKey));\n          loaded = tile.getState() === TileState.LOADED;\n          if (loaded) {\n            loaded = (callback(tile) !== false);\n          }\n        }\n        if (!loaded) {\n          covered = false;\n        }\n      }\n    }\n    return covered;\n  }\n\n  /**\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @return {number} Gutter.\n   */\n  getGutterForProjection(projection) {\n    return 0;\n  }\n\n  /**\n   * Return the key to be used for all tiles in the source.\n   * @return {string} The key for all tiles.\n   * @protected\n   */\n  getKey() {\n    return this.key_;\n  }\n\n  /**\n   * Set the value to be used as the key for all tiles in the source.\n   * @param {string} key The key for tiles.\n   * @protected\n   */\n  setKey(key) {\n    if (this.key_ !== key) {\n      this.key_ = key;\n      this.changed();\n    }\n  }\n\n  /**\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @return {boolean} Opaque.\n   */\n  getOpaque(projection) {\n    return this.opaque_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getResolutions() {\n    return this.tileGrid.getResolutions();\n  }\n\n  /**\n   * @abstract\n   * @param {number} z Tile coordinate z.\n   * @param {number} x Tile coordinate x.\n   * @param {number} y Tile coordinate y.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @return {!module:ol/Tile} Tile.\n   */\n  getTile(z, x, y, pixelRatio, projection) {}\n\n  /**\n   * Return the tile grid of the tile source.\n   * @return {module:ol/tilegrid/TileGrid} Tile grid.\n   * @api\n   */\n  getTileGrid() {\n    return this.tileGrid;\n  }\n\n  /**\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @return {!module:ol/tilegrid/TileGrid} Tile grid.\n   */\n  getTileGridForProjection(projection) {\n    if (!this.tileGrid) {\n      return getTileGridForProjection(projection);\n    } else {\n      return this.tileGrid;\n    }\n  }\n\n  /**\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @return {module:ol/TileCache} Tile cache.\n   * @protected\n   */\n  getTileCacheForProjection(projection) {\n    const thisProj = this.getProjection();\n    if (thisProj && !equivalent(thisProj, projection)) {\n      return null;\n    } else {\n      return this.tileCache;\n    }\n  }\n\n  /**\n   * Get the tile pixel ratio for this source. Subclasses may override this\n   * method, which is meant to return a supported pixel ratio that matches the\n   * provided `pixelRatio` as close as possible.\n   * @param {number} pixelRatio Pixel ratio.\n   * @return {number} Tile pixel ratio.\n   */\n  getTilePixelRatio(pixelRatio) {\n    return this.tilePixelRatio_;\n  }\n\n  /**\n   * @param {number} z Z.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @return {module:ol/size~Size} Tile size.\n   */\n  getTilePixelSize(z, pixelRatio, projection) {\n    const tileGrid = this.getTileGridForProjection(projection);\n    const tilePixelRatio = this.getTilePixelRatio(pixelRatio);\n    const tileSize = toSize(tileGrid.getTileSize(z), this.tmpSize);\n    if (tilePixelRatio == 1) {\n      return tileSize;\n    } else {\n      return scaleSize(tileSize, tilePixelRatio, this.tmpSize);\n    }\n  }\n\n  /**\n   * Returns a tile coordinate wrapped around the x-axis. When the tile coordinate\n   * is outside the resolution and extent range of the tile grid, `null` will be\n   * returned.\n   * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n   * @param {module:ol/proj/Projection=} opt_projection Projection.\n   * @return {module:ol/tilecoord~TileCoord} Tile coordinate to be passed to the tileUrlFunction or\n   *     null if no tile URL should be created for the passed `tileCoord`.\n   */\n  getTileCoordForTileUrlFunction(tileCoord, opt_projection) {\n    const projection = opt_projection !== undefined ?\n      opt_projection : this.getProjection();\n    const tileGrid = this.getTileGridForProjection(projection);\n    if (this.getWrapX() && projection.isGlobal()) {\n      tileCoord = wrapX(tileGrid, tileCoord, projection);\n    }\n    return withinExtentAndZ(tileCoord, tileGrid) ? tileCoord : null;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  refresh() {\n    this.tileCache.clear();\n    this.changed();\n  }\n}\n\n\n/**\n * Marks a tile coord as being used, without triggering a load.\n * @param {number} z Tile coordinate z.\n * @param {number} x Tile coordinate x.\n * @param {number} y Tile coordinate y.\n * @param {module:ol/proj/Projection} projection Projection.\n */\nTileSource.prototype.useTile = VOID;\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/source/Tile~TileSource} instances are instances of this\n * type.\n */\nexport class TileSourceEvent extends Event {\n  /**\n   * @param {string} type Type.\n   * @param {module:ol/Tile} tile The tile.\n   */\n  constructor(type, tile) {\n\n    super(type);\n\n    /**\n     * The tile related to the event.\n     * @type {module:ol/Tile}\n     * @api\n     */\n    this.tile = tile;\n\n  }\n\n}\n\nexport default TileSource;\n","/**\n * @module ol/source/TileEventType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n\n  /**\n   * Triggered when a tile starts loading.\n   * @event module:ol/source/Tile~TileSourceEvent#tileloadstart\n   * @api\n   */\n  TILELOADSTART: 'tileloadstart',\n\n  /**\n   * Triggered when a tile finishes loading, either when its data is loaded,\n   * or when loading was aborted because the tile is no longer needed.\n   * @event module:ol/source/Tile~TileSourceEvent#tileloadend\n   * @api\n   */\n  TILELOADEND: 'tileloadend',\n\n  /**\n   * Triggered if tile loading results in an error.\n   * @event module:ol/source/Tile~TileSourceEvent#tileloaderror\n   * @api\n   */\n  TILELOADERROR: 'tileloaderror'\n\n};\n","/**\n * @module ol/source/UrlTile\n */\nimport {getUid} from '../util.js';\nimport TileState from '../TileState.js';\nimport {expandUrl, createFromTemplates, nullTileUrlFunction} from '../tileurlfunction.js';\nimport TileSource, {TileSourceEvent} from '../source/Tile.js';\nimport TileEventType from '../source/TileEventType.js';\nimport {getKeyZXY} from '../tilecoord.js';\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/source/Source~AttributionLike} [attributions]\n * @property {number} [cacheSize]\n * @property {module:ol/extent~Extent} [extent]\n * @property {boolean} [opaque]\n * @property {module:ol/proj~ProjectionLike} [projection]\n * @property {module:ol/source/State} [state]\n * @property {module:ol/tilegrid/TileGrid} [tileGrid]\n * @property {module:ol/Tile~LoadFunction} tileLoadFunction\n * @property {number} [tilePixelRatio]\n * @property {module:ol/Tile~UrlFunction} [tileUrlFunction]\n * @property {string} [url]\n * @property {Array<string>} [urls]\n * @property {boolean} [wrapX=true]\n * @property {number} [transition]\n */\n\n\n/**\n * @classdesc\n * Base class for sources providing tiles divided into a tile grid over http.\n *\n * @fires module:ol/source/TileEvent\n */\nclass UrlTile extends TileSource {\n  /**\n   * @param {module:ol/source/UrlTile~Options=} options Image tile options.\n   */\n  constructor(options) {\n\n    super({\n      attributions: options.attributions,\n      cacheSize: options.cacheSize,\n      extent: options.extent,\n      opaque: options.opaque,\n      projection: options.projection,\n      state: options.state,\n      tileGrid: options.tileGrid,\n      tilePixelRatio: options.tilePixelRatio,\n      wrapX: options.wrapX,\n      transition: options.transition\n    });\n\n    /**\n     * @protected\n     * @type {module:ol/Tile~LoadFunction}\n     */\n    this.tileLoadFunction = options.tileLoadFunction;\n\n    /**\n     * @protected\n     * @type {module:ol/Tile~UrlFunction}\n     */\n    this.tileUrlFunction = this.fixedTileUrlFunction ?\n      this.fixedTileUrlFunction.bind(this) : nullTileUrlFunction;\n\n    /**\n     * @protected\n     * @type {!Array<string>|null}\n     */\n    this.urls = null;\n\n    if (options.urls) {\n      this.setUrls(options.urls);\n    } else if (options.url) {\n      this.setUrl(options.url);\n    }\n    if (options.tileUrlFunction) {\n      this.setTileUrlFunction(options.tileUrlFunction);\n    }\n\n    /**\n     * @private\n     * @type {!Object<number, boolean>}\n     */\n    this.tileLoadingKeys_ = {};\n\n  }\n\n  /**\n   * Return the tile load function of the source.\n   * @return {module:ol/Tile~LoadFunction} TileLoadFunction\n   * @api\n   */\n  getTileLoadFunction() {\n    return this.tileLoadFunction;\n  }\n\n  /**\n   * Return the tile URL function of the source.\n   * @return {module:ol/Tile~UrlFunction} TileUrlFunction\n   * @api\n   */\n  getTileUrlFunction() {\n    return this.tileUrlFunction;\n  }\n\n  /**\n   * Return the URLs used for this source.\n   * When a tileUrlFunction is used instead of url or urls,\n   * null will be returned.\n   * @return {!Array<string>|null} URLs.\n   * @api\n   */\n  getUrls() {\n    return this.urls;\n  }\n\n  /**\n   * Handle tile change events.\n   * @param {module:ol/events/Event} event Event.\n   * @protected\n   */\n  handleTileChange(event) {\n    const tile = /** @type {module:ol/Tile} */ (event.target);\n    const uid = getUid(tile);\n    const tileState = tile.getState();\n    let type;\n    if (tileState == TileState.LOADING) {\n      this.tileLoadingKeys_[uid] = true;\n      type = TileEventType.TILELOADSTART;\n    } else if (uid in this.tileLoadingKeys_) {\n      delete this.tileLoadingKeys_[uid];\n      type = tileState == TileState.ERROR ? TileEventType.TILELOADERROR :\n        (tileState == TileState.LOADED || tileState == TileState.ABORT) ?\n          TileEventType.TILELOADEND : undefined;\n    }\n    if (type != undefined) {\n      this.dispatchEvent(new TileSourceEvent(type, tile));\n    }\n  }\n\n  /**\n   * Set the tile load function of the source.\n   * @param {module:ol/Tile~LoadFunction} tileLoadFunction Tile load function.\n   * @api\n   */\n  setTileLoadFunction(tileLoadFunction) {\n    this.tileCache.clear();\n    this.tileLoadFunction = tileLoadFunction;\n    this.changed();\n  }\n\n  /**\n   * Set the tile URL function of the source.\n   * @param {module:ol/Tile~UrlFunction} tileUrlFunction Tile URL function.\n   * @param {string=} opt_key Optional new tile key for the source.\n   * @api\n   */\n  setTileUrlFunction(tileUrlFunction, opt_key) {\n    this.tileUrlFunction = tileUrlFunction;\n    this.tileCache.pruneExceptNewestZ();\n    if (typeof opt_key !== 'undefined') {\n      this.setKey(opt_key);\n    } else {\n      this.changed();\n    }\n  }\n\n  /**\n   * Set the URL to use for requests.\n   * @param {string} url URL.\n   * @api\n   */\n  setUrl(url) {\n    const urls = this.urls = expandUrl(url);\n    this.setTileUrlFunction(this.fixedTileUrlFunction ?\n      this.fixedTileUrlFunction.bind(this) :\n      createFromTemplates(urls, this.tileGrid), url);\n  }\n\n  /**\n   * Set the URLs to use for requests.\n   * @param {Array<string>} urls URLs.\n   * @api\n   */\n  setUrls(urls) {\n    this.urls = urls;\n    const key = urls.join('\\n');\n    this.setTileUrlFunction(this.fixedTileUrlFunction ?\n      this.fixedTileUrlFunction.bind(this) :\n      createFromTemplates(urls, this.tileGrid), key);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  useTile(z, x, y) {\n    const tileCoordKey = getKeyZXY(z, x, y);\n    if (this.tileCache.containsKey(tileCoordKey)) {\n      this.tileCache.get(tileCoordKey);\n    }\n  }\n}\n\n\n/**\n * @type {module:ol/Tile~UrlFunction|undefined}\n * @protected\n */\nUrlTile.prototype.fixedTileUrlFunction;\n\nexport default UrlTile;\n","/**\n * @module ol/source/TileImage\n */\nimport {ENABLE_RASTER_REPROJECTION} from '../reproj/common.js';\nimport {getUid} from '../util.js';\nimport ImageTile from '../ImageTile.js';\nimport TileCache from '../TileCache.js';\nimport TileState from '../TileState.js';\nimport {listen} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {equivalent, get as getProjection} from '../proj.js';\nimport ReprojTile from '../reproj/Tile.js';\nimport UrlTile from '../source/UrlTile.js';\nimport {getKey, getKeyZXY} from '../tilecoord.js';\nimport {getForProjection as getTileGridForProjection} from '../tilegrid.js';\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/source/Source~AttributionLike} [attributions] Attributions.\n * @property {number} [cacheSize=2048] Cache size.\n * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that\n * you must provide a `crossOrigin` value if you are using the WebGL renderer or if you want to\n * access pixel data with the Canvas renderer.  See\n * https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.\n * @property {boolean} [opaque=true] Whether the layer is opaque.\n * @property {module:ol/proj~ProjectionLike} projection Projection.\n * @property {number} [reprojectionErrorThreshold=0.5] Maximum allowed reprojection error (in pixels).\n * Higher values can increase reprojection performance, but decrease precision.\n * @property {module:ol/source/State} [state] Source state.\n * @property {module:ol/ImageTile~TileClass} [tileClass] Class used to instantiate image tiles.\n * Default is {@link module:ol/ImageTile~ImageTile}.\n * @property {module:ol/tilegrid/TileGrid} [tileGrid] Tile grid.\n * @property {module:ol/Tile~LoadFunction} [tileLoadFunction] Optional function to load a tile given a URL. The default is\n * ```js\n * function(imageTile, src) {\n *   imageTile.getImage().src = src;\n * };\n * ```\n * @property {number} [tilePixelRatio=1] The pixel ratio used by the tile service. For example, if the tile\n * service advertizes 256px by 256px tiles but actually sends 512px\n * by 512px images (for retina/hidpi devices) then `tilePixelRatio`\n * should be set to `2`.\n * @property {module:ol/Tile~UrlFunction} [tileUrlFunction] Optional function to get tile URL given a tile coordinate and the projection.\n * @property {string} [url] URL template. Must include `{x}`, `{y}` or `{-y}`, and `{z}` placeholders.\n * A `{?-?}` template pattern, for example `subdomain{a-f}.domain.com`, may be\n * used instead of defining each one separately in the `urls` option.\n * @property {Array<string>} [urls] An array of URL templates.\n * @property {boolean} [wrapX] Whether to wrap the world horizontally. The default, is to\n * request out-of-bounds tiles from the server. When set to `false`, only one\n * world will be rendered. When set to `true`, tiles will be requested for one\n * world only, but they will be wrapped horizontally to render multiple worlds.\n * @property {number} [transition] Duration of the opacity transition for rendering.\n * To disable the opacity transition, pass `transition: 0`.\n */\n\n\n/**\n * @classdesc\n * Base class for sources providing images divided into a tile grid.\n *\n * @fires module:ol/source/Tile~TileSourceEvent\n * @api\n */\nclass TileImage extends UrlTile {\n  /**\n   * @param {module:ol/source/TileImage~Options=} options Image tile options.\n   */\n  constructor(options) {\n\n    super({\n      attributions: options.attributions,\n      cacheSize: options.cacheSize,\n      extent: options.extent,\n      opaque: options.opaque,\n      projection: options.projection,\n      state: options.state,\n      tileGrid: options.tileGrid,\n      tileLoadFunction: options.tileLoadFunction ?\n        options.tileLoadFunction : defaultTileLoadFunction,\n      tilePixelRatio: options.tilePixelRatio,\n      tileUrlFunction: options.tileUrlFunction,\n      url: options.url,\n      urls: options.urls,\n      wrapX: options.wrapX,\n      transition: options.transition\n    });\n\n    /**\n     * @protected\n     * @type {?string}\n     */\n    this.crossOrigin =\n        options.crossOrigin !== undefined ? options.crossOrigin : null;\n\n    /**\n     * @protected\n     * @type {function(new: module:ol/ImageTile, module:ol/tilecoord~TileCoord, module:ol/TileState, string,\n     *        ?string, module:ol/Tile~LoadFunction, module:ol/Tile~Options=)}\n     */\n    this.tileClass = options.tileClass !== undefined ?\n      options.tileClass : ImageTile;\n\n    /**\n     * @protected\n     * @type {!Object<string, module:ol/TileCache>}\n     */\n    this.tileCacheForProjection = {};\n\n    /**\n     * @protected\n     * @type {!Object<string, module:ol/tilegrid/TileGrid>}\n     */\n    this.tileGridForProjection = {};\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.reprojectionErrorThreshold_ = options.reprojectionErrorThreshold;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.renderReprojectionEdges_ = false;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  canExpireCache() {\n    if (!ENABLE_RASTER_REPROJECTION) {\n      return super.canExpireCache();\n    }\n    if (this.tileCache.canExpireCache()) {\n      return true;\n    } else {\n      for (const key in this.tileCacheForProjection) {\n        if (this.tileCacheForProjection[key].canExpireCache()) {\n          return true;\n        }\n      }\n    }\n    return false;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  expireCache(projection, usedTiles) {\n    if (!ENABLE_RASTER_REPROJECTION) {\n      super.expireCache(projection, usedTiles);\n      return;\n    }\n    const usedTileCache = this.getTileCacheForProjection(projection);\n\n    this.tileCache.expireCache(this.tileCache == usedTileCache ? usedTiles : {});\n    for (const id in this.tileCacheForProjection) {\n      const tileCache = this.tileCacheForProjection[id];\n      tileCache.expireCache(tileCache == usedTileCache ? usedTiles : {});\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getGutterForProjection(projection) {\n    if (ENABLE_RASTER_REPROJECTION &&\n        this.getProjection() && projection && !equivalent(this.getProjection(), projection)) {\n      return 0;\n    } else {\n      return this.getGutter();\n    }\n  }\n\n  /**\n   * @return {number} Gutter.\n   */\n  getGutter() {\n    return 0;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getOpaque(projection) {\n    if (ENABLE_RASTER_REPROJECTION &&\n        this.getProjection() && projection && !equivalent(this.getProjection(), projection)) {\n      return false;\n    } else {\n      return super.getOpaque(projection);\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getTileGridForProjection(projection) {\n    if (!ENABLE_RASTER_REPROJECTION) {\n      return UrlTile.prototype.getTileGridForProjection.call(this, projection);\n    }\n    const thisProj = this.getProjection();\n    if (this.tileGrid && (!thisProj || equivalent(thisProj, projection))) {\n      return this.tileGrid;\n    } else {\n      const projKey = getUid(projection).toString();\n      if (!(projKey in this.tileGridForProjection)) {\n        this.tileGridForProjection[projKey] = getTileGridForProjection(projection);\n      }\n      return (\n        /** @type {!module:ol/tilegrid/TileGrid} */ (this.tileGridForProjection[projKey])\n      );\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getTileCacheForProjection(projection) {\n    if (!ENABLE_RASTER_REPROJECTION) {\n      return UrlTile.prototype.getTileCacheForProjection.call(this, projection);\n    }\n    const thisProj = this.getProjection(); if (!thisProj || equivalent(thisProj, projection)) {\n      return this.tileCache;\n    } else {\n      const projKey = getUid(projection).toString();\n      if (!(projKey in this.tileCacheForProjection)) {\n        this.tileCacheForProjection[projKey] = new TileCache(this.tileCache.highWaterMark);\n      }\n      return this.tileCacheForProjection[projKey];\n    }\n  }\n\n  /**\n   * @param {number} z Tile coordinate z.\n   * @param {number} x Tile coordinate x.\n   * @param {number} y Tile coordinate y.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @param {string} key The key set on the tile.\n   * @return {!module:ol/Tile} Tile.\n   * @private\n   */\n  createTile_(z, x, y, pixelRatio, projection, key) {\n    const tileCoord = [z, x, y];\n    const urlTileCoord = this.getTileCoordForTileUrlFunction(\n      tileCoord, projection);\n    const tileUrl = urlTileCoord ?\n      this.tileUrlFunction(urlTileCoord, pixelRatio, projection) : undefined;\n    const tile = new this.tileClass(\n      tileCoord,\n      tileUrl !== undefined ? TileState.IDLE : TileState.EMPTY,\n      tileUrl !== undefined ? tileUrl : '',\n      this.crossOrigin,\n      this.tileLoadFunction,\n      this.tileOptions);\n    tile.key = key;\n    listen(tile, EventType.CHANGE,\n      this.handleTileChange, this);\n    return tile;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getTile(z, x, y, pixelRatio, projection) {\n    const sourceProjection = /** @type {!module:ol/proj/Projection} */ (this.getProjection());\n    if (!ENABLE_RASTER_REPROJECTION ||\n        !sourceProjection || !projection || equivalent(sourceProjection, projection)) {\n      return this.getTileInternal(z, x, y, pixelRatio, sourceProjection || projection);\n    } else {\n      const cache = this.getTileCacheForProjection(projection);\n      const tileCoord = [z, x, y];\n      let tile;\n      const tileCoordKey = getKey(tileCoord);\n      if (cache.containsKey(tileCoordKey)) {\n        tile = /** @type {!module:ol/Tile} */ (cache.get(tileCoordKey));\n      }\n      const key = this.getKey();\n      if (tile && tile.key == key) {\n        return tile;\n      } else {\n        const sourceTileGrid = this.getTileGridForProjection(sourceProjection);\n        const targetTileGrid = this.getTileGridForProjection(projection);\n        const wrappedTileCoord =\n            this.getTileCoordForTileUrlFunction(tileCoord, projection);\n        const newTile = new ReprojTile(\n          sourceProjection, sourceTileGrid,\n          projection, targetTileGrid,\n          tileCoord, wrappedTileCoord, this.getTilePixelRatio(pixelRatio),\n          this.getGutter(),\n          function(z, x, y, pixelRatio) {\n            return this.getTileInternal(z, x, y, pixelRatio, sourceProjection);\n          }.bind(this), this.reprojectionErrorThreshold_,\n          this.renderReprojectionEdges_);\n        newTile.key = key;\n\n        if (tile) {\n          newTile.interimTile = tile;\n          newTile.refreshInterimChain();\n          cache.replace(tileCoordKey, newTile);\n        } else {\n          cache.set(tileCoordKey, newTile);\n        }\n        return newTile;\n      }\n    }\n  }\n\n  /**\n   * @param {number} z Tile coordinate z.\n   * @param {number} x Tile coordinate x.\n   * @param {number} y Tile coordinate y.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {!module:ol/proj/Projection} projection Projection.\n   * @return {!module:ol/Tile} Tile.\n   * @protected\n   */\n  getTileInternal(z, x, y, pixelRatio, projection) {\n    let tile = null;\n    const tileCoordKey = getKeyZXY(z, x, y);\n    const key = this.getKey();\n    if (!this.tileCache.containsKey(tileCoordKey)) {\n      tile = this.createTile_(z, x, y, pixelRatio, projection, key);\n      this.tileCache.set(tileCoordKey, tile);\n    } else {\n      tile = this.tileCache.get(tileCoordKey);\n      if (tile.key != key) {\n        // The source's params changed. If the tile has an interim tile and if we\n        // can use it then we use it. Otherwise we create a new tile.  In both\n        // cases we attempt to assign an interim tile to the new tile.\n        const interimTile = tile;\n        tile = this.createTile_(z, x, y, pixelRatio, projection, key);\n\n        //make the new tile the head of the list,\n        if (interimTile.getState() == TileState.IDLE) {\n          //the old tile hasn't begun loading yet, and is now outdated, so we can simply discard it\n          tile.interimTile = interimTile.interimTile;\n        } else {\n          tile.interimTile = interimTile;\n        }\n        tile.refreshInterimChain();\n        this.tileCache.replace(tileCoordKey, tile);\n      }\n    }\n    return tile;\n  }\n\n  /**\n   * Sets whether to render reprojection edges or not (usually for debugging).\n   * @param {boolean} render Render the edges.\n   * @api\n   */\n  setRenderReprojectionEdges(render) {\n    if (!ENABLE_RASTER_REPROJECTION ||\n        this.renderReprojectionEdges_ == render) {\n      return;\n    }\n    this.renderReprojectionEdges_ = render;\n    for (const id in this.tileCacheForProjection) {\n      this.tileCacheForProjection[id].clear();\n    }\n    this.changed();\n  }\n\n  /**\n   * Sets the tile grid to use when reprojecting the tiles to the given\n   * projection instead of the default tile grid for the projection.\n   *\n   * This can be useful when the default tile grid cannot be created\n   * (e.g. projection has no extent defined) or\n   * for optimization reasons (custom tile size, resolutions, ...).\n   *\n   * @param {module:ol/proj~ProjectionLike} projection Projection.\n   * @param {module:ol/tilegrid/TileGrid} tilegrid Tile grid to use for the projection.\n   * @api\n   */\n  setTileGridForProjection(projection, tilegrid) {\n    if (ENABLE_RASTER_REPROJECTION) {\n      const proj = getProjection(projection);\n      if (proj) {\n        const projKey = getUid(proj).toString();\n        if (!(projKey in this.tileGridForProjection)) {\n          this.tileGridForProjection[projKey] = tilegrid;\n        }\n      }\n    }\n  }\n}\n\n\n/**\n * @param {module:ol/ImageTile} imageTile Image tile.\n * @param {string} src Source.\n */\nfunction defaultTileLoadFunction(imageTile, src) {\n  imageTile.getImage().src = src;\n}\n\nexport default TileImage;\n","/**\n * @module ol/source/TileJSON\n */\n// FIXME check order of async callbacks\n\n/**\n * See http://mapbox.com/developers/api/.\n */\n\n\nimport {createFromTemplates} from '../tileurlfunction.js';\nimport {assert} from '../asserts.js';\nimport {applyTransform, intersects} from '../extent.js';\nimport {jsonp as requestJSONP} from '../net.js';\nimport {get as getProjection, getTransformFromProjections} from '../proj.js';\nimport SourceState from '../source/State.js';\nimport TileImage from '../source/TileImage.js';\nimport {createXYZ, extentFromProjection} from '../tilegrid.js';\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/source/Source~AttributionLike} [attributions] Attributions.\n * @property {number} [cacheSize=2048] Cache size.\n * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that\n * you must provide a `crossOrigin` value if you are using the WebGL renderer or if you want to\n * access pixel data with the Canvas renderer.  See\n * https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.\n * @property {boolean} [jsonp=false] Use JSONP with callback to load the TileJSON.\n * Useful when the server does not support CORS..\n * @property {number} [reprojectionErrorThreshold=0.5] Maximum allowed reprojection error (in pixels).\n * Higher values can increase reprojection performance, but decrease precision.\n * @property {tileJSON} [tileJSON] TileJSON configuration for this source.\n * If not provided, `url` must be configured.\n * @property {module:ol/Tile~LoadFunction} [tileLoadFunction] Optional function to load a tile given a URL. The default is\n * ```js\n * function(imageTile, src) {\n *   imageTile.getImage().src = src;\n * };\n * ```\n * @property {string} [url] URL to the TileJSON file. If not provided, `tileJSON` must be configured.\n * @property {boolean} [wrapX=true] Whether to wrap the world horizontally.\n * @property {number} [transition] Duration of the opacity transition for rendering.\n * To disable the opacity transition, pass `transition: 0`.\n */\n\n\n/**\n * @classdesc\n * Layer source for tile data in TileJSON format.\n * @api\n */\nclass TileJSON extends TileImage {\n  /**\n   * @param {module:ol/source/TileJSON~Options=} options TileJSON options.\n   */\n  constructor(options) {\n    super({\n      attributions: options.attributions,\n      cacheSize: options.cacheSize,\n      crossOrigin: options.crossOrigin,\n      projection: getProjection('EPSG:3857'),\n      reprojectionErrorThreshold: options.reprojectionErrorThreshold,\n      state: SourceState.LOADING,\n      tileLoadFunction: options.tileLoadFunction,\n      wrapX: options.wrapX !== undefined ? options.wrapX : true,\n      transition: options.transition\n    });\n\n    /**\n     * @type {TileJSON}\n     * @private\n     */\n    this.tileJSON_ = null;\n\n\n    if (options.url) {\n      if (options.jsonp) {\n        requestJSONP(options.url, this.handleTileJSONResponse.bind(this),\n          this.handleTileJSONError.bind(this));\n      } else {\n        const client = new XMLHttpRequest();\n        client.addEventListener('load', this.onXHRLoad_.bind(this));\n        client.addEventListener('error', this.onXHRError_.bind(this));\n        client.open('GET', options.url);\n        client.send();\n      }\n    } else if (options.tileJSON) {\n      this.handleTileJSONResponse(options.tileJSON);\n    } else {\n      assert(false, 51); // Either `url` or `tileJSON` options must be provided\n    }\n\n  }\n\n  /**\n   * @private\n   * @param {Event} event The load event.\n   */\n  onXHRLoad_(event) {\n    const client = /** @type {XMLHttpRequest} */ (event.target);\n    // status will be 0 for file:// urls\n    if (!client.status || client.status >= 200 && client.status < 300) {\n      let response;\n      try {\n        response = /** @type {TileJSON} */(JSON.parse(client.responseText));\n      } catch (err) {\n        this.handleTileJSONError();\n        return;\n      }\n      this.handleTileJSONResponse(response);\n    } else {\n      this.handleTileJSONError();\n    }\n  }\n\n  /**\n   * @private\n   * @param {Event} event The error event.\n   */\n  onXHRError_(event) {\n    this.handleTileJSONError();\n  }\n\n  /**\n   * @return {TileJSON} The tilejson object.\n   * @api\n   */\n  getTileJSON() {\n    return this.tileJSON_;\n  }\n\n  /**\n   * @protected\n   * @param {TileJSON} tileJSON Tile JSON.\n   */\n  handleTileJSONResponse(tileJSON) {\n\n    const epsg4326Projection = getProjection('EPSG:4326');\n\n    const sourceProjection = this.getProjection();\n    let extent;\n    if (tileJSON.bounds !== undefined) {\n      const transform = getTransformFromProjections(\n        epsg4326Projection, sourceProjection);\n      extent = applyTransform(tileJSON.bounds, transform);\n    }\n\n    const minZoom = tileJSON.minzoom || 0;\n    const maxZoom = tileJSON.maxzoom || 22;\n    const tileGrid = createXYZ({\n      extent: extentFromProjection(sourceProjection),\n      maxZoom: maxZoom,\n      minZoom: minZoom\n    });\n    this.tileGrid = tileGrid;\n\n    this.tileUrlFunction = createFromTemplates(tileJSON.tiles, tileGrid);\n\n    if (tileJSON.attribution !== undefined && !this.getAttributions()) {\n      const attributionExtent = extent !== undefined ?\n        extent : epsg4326Projection.getExtent();\n\n      this.setAttributions(function(frameState) {\n        if (intersects(attributionExtent, frameState.extent)) {\n          return [tileJSON.attribution];\n        }\n        return null;\n      });\n\n    }\n    this.tileJSON_ = tileJSON;\n    this.setState(SourceState.READY);\n\n  }\n\n  /**\n   * @protected\n   */\n  handleTileJSONError() {\n    this.setState(SourceState.ERROR);\n  }\n}\n\n\nexport default TileJSON;\n","/**\n * @module ol/net\n */\nimport {getUid} from './util.js';\n\n\n/**\n * Simple JSONP helper. Supports error callbacks and a custom callback param.\n * The error callback will be called when no JSONP is executed after 10 seconds.\n *\n * @param {string} url Request url. A 'callback' query parameter will be\n *     appended.\n * @param {Function} callback Callback on success.\n * @param {function()=} opt_errback Callback on error.\n * @param {string=} opt_callbackParam Custom query parameter for the JSONP\n *     callback. Default is 'callback'.\n */\nexport function jsonp(url, callback, opt_errback, opt_callbackParam) {\n  const script = document.createElement('script');\n  const key = 'olc_' + getUid(callback);\n  function cleanup() {\n    delete window[key];\n    script.parentNode.removeChild(script);\n  }\n  script.async = true;\n  script.src = url + (url.indexOf('?') == -1 ? '?' : '&') +\n      (opt_callbackParam || 'callback') + '=' + key;\n  const timer = setTimeout(function() {\n    cleanup();\n    if (opt_errback) {\n      opt_errback();\n    }\n  }, 10000);\n  window[key] = function(data) {\n    clearTimeout(timer);\n    cleanup();\n    callback(data);\n  };\n  document.getElementsByTagName('head')[0].appendChild(script);\n}\n","/**\n * @module ol/VectorImageTile\n */\nimport {getUid} from './util.js';\nimport Tile from './Tile.js';\nimport TileState from './TileState.js';\nimport {createCanvasContext2D} from './dom.js';\nimport {listen, unlistenByKey} from './events.js';\nimport {getHeight, getIntersection, getWidth} from './extent.js';\nimport EventType from './events/EventType.js';\nimport {loadFeaturesXhr} from './featureloader.js';\nimport {VOID} from './functions.js';\n\n\n/**\n * @typedef {Object} ReplayState\n * @property {boolean} dirty\n * @property {null|module:ol/render~OrderFunction} renderedRenderOrder\n * @property {number} renderedTileRevision\n * @property {number} renderedRevision\n */\n\n\nclass VectorImageTile extends Tile {\n\n  /**\n   * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n   * @param {module:ol/TileState} state State.\n   * @param {number} sourceRevision Source revision.\n   * @param {module:ol/format/Feature} format Feature format.\n   * @param {module:ol/Tile~LoadFunction} tileLoadFunction Tile load function.\n   * @param {module:ol/tilecoord~TileCoord} urlTileCoord Wrapped tile coordinate for source urls.\n   * @param {module:ol/Tile~UrlFunction} tileUrlFunction Tile url function.\n   * @param {module:ol/tilegrid/TileGrid} sourceTileGrid Tile grid of the source.\n   * @param {module:ol/tilegrid/TileGrid} tileGrid Tile grid of the renderer.\n   * @param {Object<string, module:ol/VectorTile>} sourceTiles Source tiles.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @param {function(new: module:ol/VectorTile, module:ol/tilecoord~TileCoord, module:ol/TileState, string,\n   *     module:ol/format/Feature, module:ol/Tile~LoadFunction)} tileClass Class to\n   *     instantiate for source tiles.\n   * @param {function(this: module:ol/source/VectorTile, module:ol/events/Event)} handleTileChange\n   *     Function to call when a source tile's state changes.\n   * @param {number} zoom Integer zoom to render the tile for.\n   */\n  constructor(tileCoord, state, sourceRevision, format, tileLoadFunction,\n    urlTileCoord, tileUrlFunction, sourceTileGrid, tileGrid, sourceTiles,\n    pixelRatio, projection, tileClass, handleTileChange, zoom) {\n\n    super(tileCoord, state, {transition: 0});\n\n    /**\n     * @private\n     * @type {!Object<string, CanvasRenderingContext2D>}\n     */\n    this.context_ = {};\n\n    /**\n     * @private\n     * @type {module:ol/featureloader~FeatureLoader}\n     */\n    this.loader_;\n\n    /**\n     * @private\n     * @type {!Object<string, module:ol/VectorImageTile~ReplayState>}\n     */\n    this.replayState_ = {};\n\n    /**\n     * @private\n     * @type {Object<string, module:ol/VectorTile>}\n     */\n    this.sourceTiles_ = sourceTiles;\n\n    /**\n     * Keys of source tiles used by this tile. Use with {@link #getTile}.\n     * @type {Array<string>}\n     */\n    this.tileKeys = [];\n\n    /**\n     * @type {module:ol/extent~Extent}\n     */\n    this.extent = null;\n\n    /**\n     * @type {number}\n     */\n    this.sourceRevision_ = sourceRevision;\n\n    /**\n     * @type {module:ol/tilecoord~TileCoord}\n     */\n    this.wrappedTileCoord = urlTileCoord;\n\n    /**\n     * @type {Array<module:ol/events~EventsKey>}\n     */\n    this.loadListenerKeys_ = [];\n\n    /**\n     * @type {Array<module:ol/events~EventsKey>}\n     */\n    this.sourceTileListenerKeys_ = [];\n\n    if (urlTileCoord) {\n      const extent = this.extent = tileGrid.getTileCoordExtent(urlTileCoord);\n      const resolution = tileGrid.getResolution(zoom);\n      const sourceZ = sourceTileGrid.getZForResolution(resolution);\n      const useLoadedOnly = zoom != tileCoord[0];\n      let loadCount = 0;\n      sourceTileGrid.forEachTileCoord(extent, sourceZ, function(sourceTileCoord) {\n        let sharedExtent = getIntersection(extent,\n          sourceTileGrid.getTileCoordExtent(sourceTileCoord));\n        const sourceExtent = sourceTileGrid.getExtent();\n        if (sourceExtent) {\n          sharedExtent = getIntersection(sharedExtent, sourceExtent, sharedExtent);\n        }\n        if (getWidth(sharedExtent) / resolution >= 0.5 &&\n            getHeight(sharedExtent) / resolution >= 0.5) {\n          // only include source tile if overlap is at least 1 pixel\n          ++loadCount;\n          const sourceTileKey = sourceTileCoord.toString();\n          let sourceTile = sourceTiles[sourceTileKey];\n          if (!sourceTile && !useLoadedOnly) {\n            const tileUrl = tileUrlFunction(sourceTileCoord, pixelRatio, projection);\n            sourceTile = sourceTiles[sourceTileKey] = new tileClass(sourceTileCoord,\n              tileUrl == undefined ? TileState.EMPTY : TileState.IDLE,\n              tileUrl == undefined ? '' : tileUrl,\n              format, tileLoadFunction);\n            this.sourceTileListenerKeys_.push(\n              listen(sourceTile, EventType.CHANGE, handleTileChange));\n          }\n          if (sourceTile && (!useLoadedOnly || sourceTile.getState() == TileState.LOADED)) {\n            sourceTile.consumers++;\n            this.tileKeys.push(sourceTileKey);\n          }\n        }\n      }.bind(this));\n\n      if (useLoadedOnly && loadCount == this.tileKeys.length) {\n        this.finishLoading_();\n      }\n\n      if (zoom <= tileCoord[0] && this.state != TileState.LOADED) {\n        while (zoom > tileGrid.getMinZoom()) {\n          const tile = new VectorImageTile(tileCoord, state, sourceRevision,\n            format, tileLoadFunction, urlTileCoord, tileUrlFunction,\n            sourceTileGrid, tileGrid, sourceTiles, pixelRatio, projection,\n            tileClass, VOID, --zoom);\n          if (tile.state == TileState.LOADED) {\n            this.interimTile = tile;\n            break;\n          }\n        }\n      }\n    }\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    this.state = TileState.ABORT;\n    this.changed();\n    if (this.interimTile) {\n      this.interimTile.dispose();\n    }\n\n    for (let i = 0, ii = this.tileKeys.length; i < ii; ++i) {\n      const sourceTileKey = this.tileKeys[i];\n      const sourceTile = this.getTile(sourceTileKey);\n      sourceTile.consumers--;\n      if (sourceTile.consumers == 0) {\n        delete this.sourceTiles_[sourceTileKey];\n        sourceTile.dispose();\n      }\n    }\n    this.tileKeys.length = 0;\n    this.sourceTiles_ = null;\n    this.loadListenerKeys_.forEach(unlistenByKey);\n    this.loadListenerKeys_.length = 0;\n    this.sourceTileListenerKeys_.forEach(unlistenByKey);\n    this.sourceTileListenerKeys_.length = 0;\n    super.disposeInternal();\n  }\n\n  /**\n   * @param {module:ol/layer/Layer} layer Layer.\n   * @return {CanvasRenderingContext2D} The rendering context.\n   */\n  getContext(layer) {\n    const key = getUid(layer).toString();\n    if (!(key in this.context_)) {\n      this.context_[key] = createCanvasContext2D();\n    }\n    return this.context_[key];\n  }\n\n  /**\n   * Get the Canvas for this tile.\n   * @param {module:ol/layer/Layer} layer Layer.\n   * @return {HTMLCanvasElement} Canvas.\n   */\n  getImage(layer) {\n    return this.getReplayState(layer).renderedTileRevision == -1 ?\n      null : this.getContext(layer).canvas;\n  }\n\n  /**\n   * @param {module:ol/layer/Layer} layer Layer.\n   * @return {module:ol/VectorImageTile~ReplayState} The replay state.\n   */\n  getReplayState(layer) {\n    const key = getUid(layer).toString();\n    if (!(key in this.replayState_)) {\n      this.replayState_[key] = {\n        dirty: false,\n        renderedRenderOrder: null,\n        renderedRevision: -1,\n        renderedTileRevision: -1\n      };\n    }\n    return this.replayState_[key];\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getKey() {\n    return this.tileKeys.join('/') + '-' + this.sourceRevision_;\n  }\n\n  /**\n   * @param {string} tileKey Key (tileCoord) of the source tile.\n   * @return {module:ol/VectorTile} Source tile.\n   */\n  getTile(tileKey) {\n    return this.sourceTiles_[tileKey];\n  }\n\n  /**\n   * @inheritDoc\n   */\n  load() {\n    // Source tiles with LOADED state - we just count them because once they are\n    // loaded, we're no longer listening to state changes.\n    let leftToLoad = 0;\n    // Source tiles with ERROR state - we track them because they can still have\n    // an ERROR state after another load attempt.\n    const errorSourceTiles = {};\n\n    if (this.state == TileState.IDLE) {\n      this.setState(TileState.LOADING);\n    }\n    if (this.state == TileState.LOADING) {\n      this.tileKeys.forEach(function(sourceTileKey) {\n        const sourceTile = this.getTile(sourceTileKey);\n        if (sourceTile.state == TileState.IDLE) {\n          sourceTile.setLoader(this.loader_);\n          sourceTile.load();\n        }\n        if (sourceTile.state == TileState.LOADING) {\n          const key = listen(sourceTile, EventType.CHANGE, function(e) {\n            const state = sourceTile.getState();\n            if (state == TileState.LOADED ||\n                state == TileState.ERROR) {\n              const uid = getUid(sourceTile);\n              if (state == TileState.ERROR) {\n                errorSourceTiles[uid] = true;\n              } else {\n                --leftToLoad;\n                delete errorSourceTiles[uid];\n              }\n              if (leftToLoad - Object.keys(errorSourceTiles).length == 0) {\n                this.finishLoading_();\n              }\n            }\n          }.bind(this));\n          this.loadListenerKeys_.push(key);\n          ++leftToLoad;\n        }\n      }.bind(this));\n    }\n    if (leftToLoad - Object.keys(errorSourceTiles).length == 0) {\n      setTimeout(this.finishLoading_.bind(this), 0);\n    }\n  }\n\n  /**\n   * @private\n   */\n  finishLoading_() {\n    let loaded = this.tileKeys.length;\n    let empty = 0;\n    for (let i = loaded - 1; i >= 0; --i) {\n      const state = this.getTile(this.tileKeys[i]).getState();\n      if (state != TileState.LOADED) {\n        --loaded;\n      }\n      if (state == TileState.EMPTY) {\n        ++empty;\n      }\n    }\n    if (loaded == this.tileKeys.length) {\n      this.loadListenerKeys_.forEach(unlistenByKey);\n      this.loadListenerKeys_.length = 0;\n      this.setState(TileState.LOADED);\n    } else {\n      this.setState(empty == this.tileKeys.length ? TileState.EMPTY : TileState.ERROR);\n    }\n  }\n}\n\n\nexport default VectorImageTile;\n\n/**\n * Sets the loader for a tile.\n * @param {module:ol/VectorTile} tile Vector tile.\n * @param {string} url URL.\n */\nexport function defaultLoadFunction(tile, url) {\n  const loader = loadFeaturesXhr(url, tile.getFormat(), tile.onLoad.bind(tile), tile.onError.bind(tile));\n  tile.setLoader(loader);\n}\n","/**\n * @module ol/VectorTile\n */\nimport {getUid} from './util.js';\nimport Tile from './Tile.js';\nimport TileState from './TileState.js';\n\n/**\n * @const\n * @type {module:ol/extent~Extent}\n */\nconst DEFAULT_EXTENT = [0, 0, 4096, 4096];\n\n\n/**\n * @typedef {function(new: module:ol/VectorTile, module:ol/tilecoord~TileCoord,\n * module:ol/TileState, string, ?string, module:ol/Tile~LoadFunction)} TileClass\n * @api\n */\n\nclass VectorTile extends Tile {\n\n  /**\n   * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n   * @param {module:ol/TileState} state State.\n   * @param {string} src Data source url.\n   * @param {module:ol/format/Feature} format Feature format.\n   * @param {module:ol/Tile~LoadFunction} tileLoadFunction Tile load function.\n   * @param {module:ol/Tile~Options=} opt_options Tile options.\n   */\n  constructor(tileCoord, state, src, format, tileLoadFunction, opt_options) {\n\n    super(tileCoord, state, opt_options);\n\n    /**\n     * @type {number}\n     */\n    this.consumers = 0;\n\n    /**\n     * @private\n     * @type {module:ol/extent~Extent}\n     */\n    this.extent_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/format/Feature}\n     */\n    this.format_ = format;\n\n    /**\n     * @private\n     * @type {Array<module:ol/Feature>}\n     */\n    this.features_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/featureloader~FeatureLoader}\n     */\n    this.loader_;\n\n    /**\n     * Data projection\n     * @private\n     * @type {module:ol/proj/Projection}\n     */\n    this.projection_ = null;\n\n    /**\n     * @private\n     * @type {Object<string, module:ol/render/ReplayGroup>}\n     */\n    this.replayGroups_ = {};\n\n    /**\n     * @private\n     * @type {module:ol/Tile~LoadFunction}\n     */\n    this.tileLoadFunction_ = tileLoadFunction;\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.url_ = src;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    this.features_ = null;\n    this.replayGroups_ = {};\n    this.state = TileState.ABORT;\n    this.changed();\n    super.disposeInternal();\n  }\n\n  /**\n   * Gets the extent of the vector tile.\n   * @return {module:ol/extent~Extent} The extent.\n   * @api\n   */\n  getExtent() {\n    return this.extent_ || DEFAULT_EXTENT;\n  }\n\n  /**\n   * Get the feature format assigned for reading this tile's features.\n   * @return {module:ol/format/Feature} Feature format.\n   * @api\n   */\n  getFormat() {\n    return this.format_;\n  }\n\n  /**\n   * Get the features for this tile. Geometries will be in the projection returned\n   * by {@link module:ol/VectorTile~VectorTile#getProjection}.\n   * @return {Array<module:ol/Feature|module:ol/render/Feature>} Features.\n   * @api\n   */\n  getFeatures() {\n    return this.features_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getKey() {\n    return this.url_;\n  }\n\n  /**\n   * Get the feature projection of features returned by\n   * {@link module:ol/VectorTile~VectorTile#getFeatures}.\n   * @return {module:ol/proj/Projection} Feature projection.\n   * @api\n   */\n  getProjection() {\n    return this.projection_;\n  }\n\n  /**\n   * @param {module:ol/layer/Layer} layer Layer.\n   * @param {string} key Key.\n   * @return {module:ol/render/ReplayGroup} Replay group.\n   */\n  getReplayGroup(layer, key) {\n    return this.replayGroups_[getUid(layer) + ',' + key];\n  }\n\n  /**\n   * @inheritDoc\n   */\n  load() {\n    if (this.state == TileState.IDLE) {\n      this.setState(TileState.LOADING);\n      this.tileLoadFunction_(this, this.url_);\n      this.loader_(null, NaN, null);\n    }\n  }\n\n  /**\n   * Handler for successful tile load.\n   * @param {Array<module:ol/Feature>} features The loaded features.\n   * @param {module:ol/proj/Projection} dataProjection Data projection.\n   * @param {module:ol/extent~Extent} extent Extent.\n   */\n  onLoad(features, dataProjection, extent) {\n    this.setProjection(dataProjection);\n    this.setFeatures(features);\n    this.setExtent(extent);\n  }\n\n  /**\n   * Handler for tile load errors.\n   */\n  onError() {\n    this.setState(TileState.ERROR);\n  }\n\n  /**\n   * Function for use in an {@link module:ol/source/VectorTile~VectorTile}'s\n   * `tileLoadFunction`. Sets the extent of the vector tile. This is only required\n   * for tiles in projections with `tile-pixels` as units. The extent should be\n   * set to `[0, 0, tilePixelSize, tilePixelSize]`, where `tilePixelSize` is\n   * calculated by multiplying the tile size with the tile pixel ratio. For\n   * sources using {@link module:ol/format/MVT~MVT} as feature format, the\n   * {@link module:ol/format/MVT~MVT#getLastExtent} method will return the correct\n   * extent. The default is `[0, 0, 4096, 4096]`.\n   * @param {module:ol/extent~Extent} extent The extent.\n   * @api\n   */\n  setExtent(extent) {\n    this.extent_ = extent;\n  }\n\n  /**\n   * Function for use in an {@link module:ol/source/VectorTile~VectorTile}'s `tileLoadFunction`.\n   * Sets the features for the tile.\n   * @param {Array<module:ol/Feature>} features Features.\n   * @api\n   */\n  setFeatures(features) {\n    this.features_ = features;\n    this.setState(TileState.LOADED);\n  }\n\n  /**\n   * Function for use in an {@link module:ol/source/VectorTile~VectorTile}'s `tileLoadFunction`.\n   * Sets the projection of the features that were added with\n   * {@link module:ol/VectorTile~VectorTile#setFeatures}.\n   * @param {module:ol/proj/Projection} projection Feature projection.\n   * @api\n   */\n  setProjection(projection) {\n    this.projection_ = projection;\n  }\n\n  /**\n   * @param {module:ol/layer/Layer} layer Layer.\n   * @param {string} key Key.\n   * @param {module:ol/render/ReplayGroup} replayGroup Replay group.\n   */\n  setReplayGroup(layer, key, replayGroup) {\n    this.replayGroups_[getUid(layer) + ',' + key] = replayGroup;\n  }\n\n  /**\n   * Set the feature loader for reading this tile's features.\n   * @param {module:ol/featureloader~FeatureLoader} loader Feature loader.\n   * @api\n   */\n  setLoader(loader) {\n    this.loader_ = loader;\n  }\n}\n\nexport default VectorTile;\n","/**\n * @module ol/source/VectorTile\n */\n\nimport TileState from '../TileState.js';\nimport VectorImageTile, {defaultLoadFunction} from '../VectorImageTile.js';\nimport Tile from '../VectorTile.js';\nimport {toSize} from '../size.js';\nimport UrlTile from '../source/UrlTile.js';\nimport {getKeyZXY} from '../tilecoord.js';\nimport {createXYZ, extentFromProjection, createForProjection} from '../tilegrid.js';\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/source/Source~AttributionLike} [attributions] Attributions.\n * @property {number} [cacheSize=128] Cache size.\n * @property {module:ol/format/Feature} [format] Feature format for tiles. Used and required by the default.\n * @property {boolean} [overlaps=true] This source may have overlapping geometries. Setting this\n * to `false` (e.g. for sources with polygons that represent administrative\n * boundaries or TopoJSON sources) allows the renderer to optimise fill and\n * stroke operations.\n * @property {module:ol/proj~ProjectionLike} projection Projection.\n * @property {module:ol/source/State} [state] Source state.\n * @property {module:ol/VectorTile~TileClass} [tileClass] Class used to instantiate image tiles.\n * Default is {@link module:ol/VectorTile}.\n * @property {number} [maxZoom=22] Optional max zoom level.\n * @property {number} [minZoom] Optional min zoom level.\n * @property {number|module:ol/size~Size} [tileSize=512] Optional tile size.\n * @property {module:ol/tilegrid/TileGrid} [tileGrid] Tile grid.\n * @property {module:ol/Tile~LoadFunction} [tileLoadFunction]\n * Optional function to load a tile given a URL. Could look like this:\n * ```js\n * function(tile, url) {\n *   tile.setLoader(function() {\n *     var data = // ... fetch data\n *     var format = tile.getFormat();\n *     tile.setProjection(format.readProjection(data));\n *     tile.setFeatures(format.readFeatures(data, {\n *       // featureProjection is not required for ol/format/MVT\n *       featureProjection: map.getView().getProjection()\n *     }));\n *     // the line below is only required for ol/format/MVT\n *     tile.setExtent(format.getLastExtent());\n *   }\n * });\n * ```\n * @property {module:ol/Tile~UrlFunction} [tileUrlFunction] Optional function to get tile URL given a tile coordinate and the projection.\n * @property {string} [url] URL template. Must include `{x}`, `{y}` or `{-y}`, and `{z}` placeholders.\n * A `{?-?}` template pattern, for example `subdomain{a-f}.domain.com`, may be\n * used instead of defining each one separately in the `urls` option.\n * @property {number} [transition] A duration for tile opacity\n * transitions in milliseconds. A duration of 0 disables the opacity transition.\n * @property {Array<string>} [urls] An array of URL templates.\n * @property {boolean} [wrapX=true] Whether to wrap the world horizontally.\n * When set to `false`, only one world\n * will be rendered. When set to `true`, tiles will be wrapped horizontally to\n * render multiple worlds.\n */\n\n\n/**\n * @classdesc\n * Class for layer sources providing vector data divided into a tile grid, to be\n * used with {@link module:ol/layer/VectorTile~VectorTile}. Although this source receives tiles\n * with vector features from the server, it is not meant for feature editing.\n * Features are optimized for rendering, their geometries are clipped at or near\n * tile boundaries and simplified for a view resolution. See\n * {@link module:ol/source/Vector} for vector sources that are suitable for feature\n * editing.\n *\n * @fires module:ol/source/Tile~TileSourceEvent\n * @api\n */\nclass VectorTile extends UrlTile {\n  /**\n   * @param {module:ol/source/VectorTile~Options=} options Vector tile options.\n   */\n  constructor(options) {\n    const projection = options.projection || 'EPSG:3857';\n\n    const extent = options.extent || extentFromProjection(projection);\n\n    const tileGrid = options.tileGrid || createXYZ({\n      extent: extent,\n      maxZoom: options.maxZoom || 22,\n      minZoom: options.minZoom,\n      tileSize: options.tileSize || 512\n    });\n\n    super({\n      attributions: options.attributions,\n      cacheSize: options.cacheSize !== undefined ? options.cacheSize : 128,\n      extent: extent,\n      opaque: false,\n      projection: projection,\n      state: options.state,\n      tileGrid: tileGrid,\n      tileLoadFunction: options.tileLoadFunction ? options.tileLoadFunction : defaultLoadFunction,\n      tileUrlFunction: options.tileUrlFunction,\n      url: options.url,\n      urls: options.urls,\n      wrapX: options.wrapX === undefined ? true : options.wrapX,\n      transition: options.transition\n    });\n\n    /**\n     * @private\n     * @type {module:ol/format/Feature}\n     */\n    this.format_ = options.format ? options.format : null;\n\n    /**\n       * @private\n       * @type {Object<string, module:ol/VectorTile>}\n       */\n    this.sourceTiles_ = {};\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.overlaps_ = options.overlaps == undefined ? true : options.overlaps;\n\n    /**\n       * @protected\n       * @type {function(new: module:ol/VectorTile, module:ol/tilecoord~TileCoord, module:ol/TileState, string,\n       *        module:ol/format/Feature, module:ol/Tile~LoadFunction)}\n       */\n    this.tileClass = options.tileClass ? options.tileClass : Tile;\n\n    /**\n     * @private\n     * @type {Object<string, module:ol/tilegrid/TileGrid>}\n     */\n    this.tileGrids_ = {};\n\n  }\n\n  /**\n   * @return {boolean} The source can have overlapping geometries.\n   */\n  getOverlaps() {\n    return this.overlaps_;\n  }\n\n  /**\n   * clear {@link module:ol/TileCache~TileCache} and delete all source tiles\n   * @api\n   */\n  clear() {\n    this.tileCache.clear();\n    this.sourceTiles_ = {};\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getTile(z, x, y, pixelRatio, projection) {\n    const tileCoordKey = getKeyZXY(z, x, y);\n    if (this.tileCache.containsKey(tileCoordKey)) {\n      return (\n        /** @type {!module:ol/Tile} */ (this.tileCache.get(tileCoordKey))\n      );\n    } else {\n      const tileCoord = [z, x, y];\n      const urlTileCoord = this.getTileCoordForTileUrlFunction(\n        tileCoord, projection);\n      const tile = new VectorImageTile(\n        tileCoord,\n        urlTileCoord !== null ? TileState.IDLE : TileState.EMPTY,\n        this.getRevision(),\n        this.format_, this.tileLoadFunction, urlTileCoord, this.tileUrlFunction,\n        this.tileGrid, this.getTileGridForProjection(projection),\n        this.sourceTiles_, pixelRatio, projection, this.tileClass,\n        this.handleTileChange.bind(this), tileCoord[0]);\n\n      this.tileCache.set(tileCoordKey, tile);\n      return tile;\n    }\n  }\n\n\n  /**\n   * @inheritDoc\n   */\n  getTileGridForProjection(projection) {\n    const code = projection.getCode();\n    let tileGrid = this.tileGrids_[code];\n    if (!tileGrid) {\n      // A tile grid that matches the tile size of the source tile grid is more\n      // likely to have 1:1 relationships between source tiles and rendered tiles.\n      const sourceTileGrid = this.tileGrid;\n      tileGrid = this.tileGrids_[code] = createForProjection(projection, undefined,\n        sourceTileGrid ? sourceTileGrid.getTileSize(sourceTileGrid.getMinZoom()) : undefined);\n    }\n    return tileGrid;\n  }\n\n\n  /**\n   * @inheritDoc\n   */\n  getTilePixelRatio(pixelRatio) {\n    return pixelRatio;\n  }\n\n\n  /**\n   * @inheritDoc\n   */\n  getTilePixelSize(z, pixelRatio, projection) {\n    const tileGrid = this.getTileGridForProjection(projection);\n    const tileSize = toSize(tileGrid.getTileSize(z), this.tmpSize);\n    return [Math.round(tileSize[0] * pixelRatio), Math.round(tileSize[1] * pixelRatio)];\n  }\n}\n\n\nexport default VectorTile;\n","/**\n * @module ol/source/XYZ\n */\n\nimport TileImage from '../source/TileImage.js';\nimport {createXYZ, extentFromProjection} from '../tilegrid.js';\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/source/Source~AttributionLike} [attributions] Attributions.\n * @property {number} [cacheSize=2048] Cache size.\n * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that\n * you must provide a `crossOrigin` value if you are using the WebGL renderer or if you want to\n * access pixel data with the Canvas renderer.  See\n * https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.\n * @property {boolean} [opaque=true] Whether the layer is opaque.\n * @property {module:ol/proj~ProjectionLike} [projection='EPSG:3857'] Projection.\n * @property {number} [reprojectionErrorThreshold=0.5] Maximum allowed reprojection error (in pixels).\n * Higher values can increase reprojection performance, but decrease precision.\n * @property {number} [maxZoom=18] Optional max zoom level.\n * @property {number} [minZoom=0] Optional min zoom level.\n * @property {module:ol/tilegrid/TileGrid} [tileGrid] Tile grid.\n * @property {module:ol/Tile~LoadFunction} [tileLoadFunction] Optional function to load a tile given a URL. The default is\n * ```js\n * function(imageTile, src) {\n *   imageTile.getImage().src = src;\n * };\n * ```\n * @property {number} [tilePixelRatio=1] The pixel ratio used by the tile service.\n * For example, if the tile service advertizes 256px by 256px tiles but actually sends 512px\n * by 512px images (for retina/hidpi devices) then `tilePixelRatio`\n * should be set to `2`.\n * @property {number|module:ol/size~Size} [tileSize=[256, 256]] The tile size used by the tile service.\n * @property {module:ol/Tile~UrlFunction} [tileUrlFunction] Optional function to get\n * tile URL given a tile coordinate and the projection.\n * Required if url or urls are not provided.\n * @property {string} [url] URL template. Must include `{x}`, `{y}` or `{-y}`,\n * and `{z}` placeholders. A `{?-?}` template pattern, for example `subdomain{a-f}.domain.com`,\n * may be used instead of defining each one separately in the `urls` option.\n * @property {Array<string>} [urls] An array of URL templates.\n * @property {boolean} [wrapX=true] Whether to wrap the world horizontally.\n * @property {number} [transition] Duration of the opacity transition for rendering.\n * To disable the opacity transition, pass `transition: 0`.\n */\n\n\n/**\n * @classdesc\n * Layer source for tile data with URLs in a set XYZ format that are\n * defined in a URL template. By default, this follows the widely-used\n * Google grid where `x` 0 and `y` 0 are in the top left. Grids like\n * TMS where `x` 0 and `y` 0 are in the bottom left can be used by\n * using the `{-y}` placeholder in the URL template, so long as the\n * source does not have a custom tile grid. In this case,\n * {@link module:ol/source/TileImage} can be used with a `tileUrlFunction`\n * such as:\n *\n *  tileUrlFunction: function(coordinate) {\n *    return 'http://mapserver.com/' + coordinate[0] + '/' +\n *        coordinate[1] + '/' + coordinate[2] + '.png';\n *    }\n *\n * @api\n */\nclass XYZ extends TileImage {\n  /**\n   * @param {module:ol/source/XYZ~Options=} opt_options XYZ options.\n   */\n  constructor(opt_options) {\n    const options = opt_options || {};\n    const projection = options.projection !== undefined ?\n      options.projection : 'EPSG:3857';\n\n    const tileGrid = options.tileGrid !== undefined ? options.tileGrid :\n      createXYZ({\n        extent: extentFromProjection(projection),\n        maxZoom: options.maxZoom,\n        minZoom: options.minZoom,\n        tileSize: options.tileSize\n      });\n\n    super({\n      attributions: options.attributions,\n      cacheSize: options.cacheSize,\n      crossOrigin: options.crossOrigin,\n      opaque: options.opaque,\n      projection: projection,\n      reprojectionErrorThreshold: options.reprojectionErrorThreshold,\n      tileGrid: tileGrid,\n      tileLoadFunction: options.tileLoadFunction,\n      tilePixelRatio: options.tilePixelRatio,\n      tileUrlFunction: options.tileUrlFunction,\n      url: options.url,\n      urls: options.urls,\n      wrapX: options.wrapX !== undefined ? options.wrapX : true,\n      transition: options.transition\n    });\n\n  }\n\n}\n\nexport default XYZ;\n","/*\nol-mapbox-style - Use Mapbox Style objects with OpenLayers\nCopyright 2016-present Boundless Spatial, Inc.\nLicense: https://raw.githubusercontent.com/boundlessgeo/ol-mapbox-gl-style/master/LICENSE\n*/\n\nimport mb2css from 'mapbox-to-css-font';\nimport applyStyleFunction, {getValue} from './stylefunction';\nimport googleFonts from 'webfont-matcher/lib/fonts/google';\nimport {fromLonLat} from 'ol/proj';\nimport {createXYZ} from 'ol/tilegrid';\nimport Map from 'ol/Map';\nimport GeoJSON from 'ol/format/GeoJSON';\nimport MVT from 'ol/format/MVT';\nimport {unByKey} from 'ol/Observable';\nimport TileLayer from 'ol/layer/Tile';\nimport VectorLayer from 'ol/layer/Vector';\nimport VectorTileLayer from 'ol/layer/VectorTile';\nimport TileJSON from 'ol/source/TileJSON';\nimport VectorSource from 'ol/source/Vector';\nimport VectorTileSource from 'ol/source/VectorTile';\nimport XYZ from 'ol/source/XYZ';\nimport {Color} from '@mapbox/mapbox-gl-style-spec';\n\nconst fontFamilyRegEx = /font-family: ?([^;]*);/;\nconst stripQuotesRegEx = /(\"|')/g;\nlet loadedFontFamilies;\nfunction hasFontFamily(family) {\n  if (!loadedFontFamilies) {\n    loadedFontFamilies = {};\n    const styleSheets = document.styleSheets;\n    for (let i = 0, ii = styleSheets.length; i < ii; ++i) {\n      const styleSheet = styleSheets[i];\n      try {\n        const cssRules = styleSheet.rules || styleSheet.cssRules;\n        if (cssRules) {\n          for (let j = 0, jj = cssRules.length; j < jj; ++j) {\n            const cssRule = cssRules[j];\n            if (cssRule.type == 5) {\n              const match = cssRule.cssText.match(fontFamilyRegEx);\n              loadedFontFamilies[match[1].replace(stripQuotesRegEx, '')] = true;\n            }\n          }\n        }\n      } catch (e) {\n        // empty catch block\n      }\n    }\n  }\n  return family in loadedFontFamilies;\n}\n\nconst fontFamilies = {};\nconst googleFamilies = googleFonts.getNames();\nfunction getFonts(fonts) {\n  if (fonts in fontFamilies) {\n    return fontFamilies[fonts];\n  }\n  const families = fonts.map(function(font) {\n    return mb2css(font, 1).split(' 1px ')[1].replace(/\"/g, '');\n  });\n  const family = families[0];\n  if (!hasFontFamily(family) && googleFamilies.indexOf(family) !== -1) {\n    const fontUrl = 'https://fonts.googleapis.com/css?family=' + family.replace(/ /g, '+');\n    if (!document.querySelector('link[href=\"' + fontUrl + '\"]')) {\n      const markup = document.createElement('link');\n      markup.href = fontUrl;\n      markup.rel = 'stylesheet';\n      document.getElementsByTagName('head')[0].appendChild(markup);\n    }\n  }\n  return fonts;\n}\n\nconst spriteRegEx = /^(.*)(\\?.*)$/;\n\nfunction withPath(url, path) {\n  if (path && url.indexOf('http') != 0) {\n    url = path + url;\n  }\n  return url;\n}\n\nfunction toSpriteUrl(url, path, extension) {\n  url = withPath(url, path);\n  const parts = url.match(spriteRegEx);\n  return parts ?\n    parts[1] + extension + (parts.length > 2 ? parts[2] : '') :\n    url + extension;\n}\n\n/**\n * Applies a style function to an `ol.layer.VectorTile` or `ol.layer.Vector`\n * with an `ol.source.VectorTile` or an `ol.source.Vector`. The style function\n * will render all layers from the `glStyle` object that use the specified\n * `source`, or a subset of layers from the same source. The source needs to be\n * a `\"type\": \"vector\"` or `\"type\": \"geojson\"` source.\n *\n * Two additional properties will be set on the provided layer:\n *\n *  * `mapbox-source`: The `id` of the Mapbox Style document's source that the\n *    OpenLayers layer was created from. Usually `apply()` creates one\n *    OpenLayers layer per Mapbox Style source, unless the layer stack has\n *    layers from different sources in between.\n *  * `mapbox-layers`: The `id`s of the Mapbox Style document's layers that are\n *    included in the OpenLayers layer.\n *\n * @param {ol.layer.VectorTile|ol.layer.Vector} layer OpenLayers layer.\n * @param {string|Object} glStyle Mapbox Style object.\n * @param {string|Array<string>} source `source` key or an array of layer `id`s from the\n * Mapbox Style object. When a `source` key is provided, all layers for the\n * specified source will be included in the style function. When layer `id`s\n * are provided, they must be from layers that use the same source.\n * @param {string} [path=undefined] Path of the style file. Only required when\n * a relative path is used with the `\"sprite\"` property of the style.\n * @param {Array<number>} [resolutions=undefined] Resolutions for mapping resolution to zoom level.\n * @return {Promise} Promise which will be resolved when the style can be used\n * for rendering.\n */\nexport function applyStyle(layer, glStyle, source, path, resolutions) {\n  return new Promise(function(resolve, reject) {\n\n    // TODO: figure out where best place to check source type is\n    // Note that the source arg is an array of gl layer ids and each must be\n    // dereferenced to get source type to validate\n    if (typeof glStyle != 'object') {\n      glStyle = JSON.parse(glStyle);\n    }\n    if (glStyle.version != 8) {\n      return reject(new Error('glStyle version 8 required.'));\n    }\n    if (!(layer instanceof VectorLayer || layer instanceof VectorTileLayer)) {\n      return reject(new Error('Can only apply to VectorLayer or VectorTileLayer'));\n    }\n\n    let spriteScale, spriteData, spriteImageUrl, style;\n    function onChange() {\n      if (!style && (!glStyle.sprite || spriteData)) {\n        style = applyStyleFunction(layer, glStyle, source, resolutions, spriteData, spriteImageUrl, getFonts);\n        if (!layer.getStyle()) {\n          reject(new Error(`Nothing to show for source [${source}]`));\n        } else {\n          resolve();\n        }\n      } else if (style) {\n        layer.setStyle(style);\n        resolve();\n      } else {\n        reject(new Error('Something went wrong trying to apply style.'));\n      }\n    }\n\n    if (glStyle.sprite) {\n      spriteScale = window.devicePixelRatio >= 1.5 ? 0.5 : 1;\n      const sizeFactor = spriteScale == 0.5 ? '@2x' : '';\n      let spriteUrl = toSpriteUrl(glStyle.sprite, path, sizeFactor + '.json');\n\n      fetch(spriteUrl, {credentials: 'same-origin'})\n        .then(function(response) {\n          if (!response.ok && (sizeFactor !== '')) {\n            spriteUrl = toSpriteUrl(glStyle.sprite, path, '.json');\n            return fetch(spriteUrl, {credentials: 'same-origin'});\n          } else {\n            return response;\n          }\n        })\n        .then(function(response) {\n          if (response.ok) {\n            return response.json();\n          } else {\n            reject(new Error(`Problem fetching sprite from ${spriteUrl}: ${response.statusText}`));\n          }\n        })\n        .then(function(spritesJson) {\n          if ((spritesJson === undefined) || (Object.keys(spritesJson).length === 0)) {\n            return reject(new Error('No sprites found.'));\n          }\n          spriteData = spritesJson;\n          spriteImageUrl = toSpriteUrl(glStyle.sprite, path, sizeFactor + '.png');\n          onChange();\n        })\n        .catch(function(err) {\n          reject(new Error(`Sprites cannot be loaded: ${spriteUrl}: ${err.message}`));\n        });\n    } else {\n      onChange();\n    }\n\n  });\n}\n\nconst emptyObj = {};\n\nfunction setBackground(map, layer) {\n  const background = {\n    type: layer.type\n  };\n  function updateStyle() {\n    const element = map.getTargetElement();\n    if (!element) {\n      return;\n    }\n    const layout = layer.layout || {};\n    const paint = layer.paint || {};\n    background['paint'] = paint;\n    background.id = 'olms-bg-' + paint['background-opacity'] + paint['background-color'];\n    const zoom = map.getView().getZoom();\n    if (paint['background-color'] !== undefined) {\n      const bg = getValue(background, 'paint', 'background-color', zoom, emptyObj);\n      element.style.backgroundColor = Color.parse(bg).toString();\n    }\n    if (paint['background-opacity'] !== undefined) {\n      element.style.backgroundOpacity =\n        getValue(background, 'paint', 'background-opacity', zoom, emptyObj);\n    }\n    if (layout.visibility == 'none') {\n      element.style.backgroundColor = '';\n      element.style.backgroundOpacity = '';\n    }\n  }\n  if (map.getTargetElement()) {\n    updateStyle();\n  }\n  map.on(['change:resolution', 'change:target'], updateStyle);\n}\n\n/**\n * ```js\n * import {applyBackground} from 'ol-mapbox-style';\n * ```\n * Applies properties of the Mapbox Style's first `background` layer to the map.\n * @param {ol.Map} map OpenLayers Map.\n * @param {Object} glStyle Mapbox Style object.\n */\nexport function applyBackground(map, glStyle) {\n  glStyle.layers.some(function(l) {\n    if (l.type == 'background') {\n      setBackground(map, l);\n      return true;\n    }\n  });\n}\n\nfunction getSourceIdByRef(layers, ref) {\n  let sourceId;\n  layers.some(function(layer) {\n    if (layer.id == ref) {\n      sourceId = layer.source;\n      return true;\n    }\n  });\n  return sourceId;\n}\n\nfunction setupVectorLayer(glSource, accessToken, url) {\n  let tiles = glSource.tiles;\n  if (url) {\n    if (url.indexOf('mapbox://') == 0) {\n      const mapid = url.replace('mapbox://', '');\n      tiles = ['a', 'b', 'c', 'd'].map(function(host) {\n        return 'https://' + host + '.tiles.mapbox.com/v4/' + mapid +\n            '/{z}/{x}/{y}.' +\n            (glSource.type == 'vector' ? 'vector.pbf' : 'png') +\n            accessToken;\n      });\n    }\n  }\n  return tiles ? (function() {\n    const tileGrid = createXYZ({\n      tileSize: 512,\n      maxZoom: 'maxzoom' in glSource ? glSource.maxzoom : 22,\n      minZoom: glSource.minzoom\n    });\n    return new VectorTileLayer({\n      declutter: true,\n      maxResolution: tileGrid.getMinZoom() > 0 ?\n        tileGrid.getResolution(tileGrid.getMinZoom()) : undefined,\n      source: new VectorTileSource({\n        attributions: glSource.attribution,\n        format: new MVT(),\n        tileGrid: tileGrid,\n        urls: tiles\n      }),\n      visible: false\n    });\n  })() : (function() {\n    const layer = new VectorTileLayer({\n      declutter: true,\n      visible: false\n    });\n    const tilejson = new TileJSON({\n      url: url\n    });\n    const key = tilejson.on('change', function() {\n      if (tilejson.getState() == 'ready') {\n        const tileJSONDoc = tilejson.getTileJSON();\n        const tiles = Array.isArray(tileJSONDoc.tiles) ? tileJSONDoc.tiles : [tileJSONDoc.tiles];\n        for (let i = 0, ii = tiles.length; i < ii; ++i) {\n          const tile = tiles[i];\n          if (tile.indexOf('http') != 0) {\n            tiles[i] = glSource.url + tile;\n          }\n        }\n        const tileGrid = tilejson.getTileGrid();\n        layer.setSource(new VectorTileSource({\n          attributions: tilejson.getAttributions() || tileJSONDoc.attribution,\n          format: new MVT(),\n          tileGrid: createXYZ({\n            minZoom: tileGrid.getMinZoom(),\n            maxZoom: tileGrid.getMaxZoom(),\n            tileSize: 512\n          }),\n          urls: tiles\n        }));\n        if (tileGrid.getMinZoom() > 0) {\n          layer.setMaxResolution(\n            tileGrid.getResolution(tileGrid.getMinZoom()));\n        }\n        unByKey(key);\n      } else if (tilejson.getState() == 'error') {\n        layer.setSource(undefined);\n        unByKey(key);\n      }\n    });\n    return layer;\n  })();\n}\n\nfunction setupRasterLayer(glSource, url) {\n  const layer = new TileLayer();\n  let source;\n  if (!glSource.tiles) {\n    source = new TileJSON({\n      transition: 0,\n      url: url,\n      crossOrigin: 'anonymous'\n    });\n    const key = source.on('change', function() {\n      const state = source.getState();\n      if (state === 'ready' || state === 'error') {\n        unByKey(key);\n        layer.setSource(source);\n      }\n    });\n  } else {\n    source = new XYZ({\n      transition: 0,\n      attributions: glSource.attribution,\n      minZoom: glSource.minzoom,\n      maxZoom: 'maxzoom' in glSource ? glSource.maxzoom : 22,\n      tileSize: glSource.tileSize || 512,\n      url: url,\n      urls: glSource.tiles,\n      crossOrigin: 'anonymous'\n    });\n  }\n  source.setTileLoadFunction(function(tile, src) {\n    if (src.indexOf('{bbox-epsg-3857}') != -1) {\n      const bbox = source.getTileGrid().getTileCoordExtent(tile.getTileCoord());\n      src = src.replace('{bbox-epsg-3857}', bbox.toString());\n    }\n    tile.getImage().src = src;\n  });\n  layer.setSource(source);\n  return layer;\n}\n\nconst geoJsonFormat = new GeoJSON();\nfunction setupGeoJSONLayer(glSource, path) {\n  const data = glSource.data;\n  let features, geoJsonUrl;\n  if (typeof data == 'string') {\n    geoJsonUrl = withPath(data, path);\n  } else {\n    features = geoJsonFormat.readFeatures(data, {featureProjection: 'EPSG:3857'});\n  }\n  return new VectorLayer({\n    source: new VectorSource({\n      attributions: glSource.attribution,\n      features: features,\n      format: geoJsonFormat,\n      url: geoJsonUrl\n    }),\n    visible: false\n  });\n}\n\nfunction processStyle(glStyle, map, baseUrl, host, path, accessToken) {\n  const promises = [];\n  const view = map.getView();\n  if ('center' in glStyle && !view.getCenter()) {\n    view.setCenter(fromLonLat(glStyle.center));\n  }\n  if ('zoom' in glStyle && view.getZoom() === undefined) {\n    view.setZoom(glStyle.zoom);\n  }\n  if (!view.getCenter() || view.getZoom() === undefined) {\n    view.fit(view.getProjection().getExtent(), {\n      nearest: true,\n      size: map.getSize()\n    });\n  }\n  if (glStyle.sprite) {\n    if (glStyle.sprite.indexOf('mapbox://') == 0) {\n      glStyle.sprite = baseUrl + '/sprite' + accessToken;\n    } else if (glStyle.sprite.indexOf('http') != 0) {\n      glStyle.sprite = (host ? (host + path) : '') + glStyle.sprite + accessToken;\n    }\n  }\n\n  const glLayers = glStyle.layers;\n  let layerIds = [];\n\n  let glLayer, glSource, glSourceId, id, layer, url;\n  for (let i = 0, ii = glLayers.length; i < ii; ++i) {\n    glLayer = glLayers[i];\n    if (glLayer.type == 'background') {\n      setBackground(map, glLayer);\n    } else {\n      id = glLayer.source || getSourceIdByRef(glLayers, glLayer.ref);\n      // this technique assumes gl layers will be in a particular order\n      if (id != glSourceId) {\n        if (layerIds.length) {\n          promises.push(finalizeLayer(layer, layerIds, glStyle, path, map));\n          layerIds = [];\n        }\n        glSource = glStyle.sources[id];\n        url = glSource.url;\n\n        if (glSource.type == 'vector') {\n          layer = setupVectorLayer(glSource, accessToken, url);\n        } else if (glSource.type == 'raster') {\n          layer = setupRasterLayer(glSource, url);\n          layer.setVisible(glLayer.layout ? glLayer.layout.visibility !== 'none' : true);\n        } else if (glSource.type == 'geojson') {\n          layer = setupGeoJSONLayer(glSource, path);\n        }\n        glSourceId = id;\n        if (layer) {\n          layer.set('mapbox-source', glSourceId);\n        }\n      }\n      layerIds.push(glLayer.id);\n    }\n  }\n  promises.push(finalizeLayer(layer, layerIds, glStyle, path, map));\n  map.set('mapbox-style', glStyle);\n  return Promise.all(promises);\n}\n\n/**\n * ```js\n * import olms from 'ol-mapbox-style';\n * ```\n *\n * Loads and applies a Mapbox Style object to an OpenLayers Map. This includes\n * the map background, the layers, the center and the zoom.\n *\n * The center and zoom will only be set if present in the Mapbox Style document,\n * and if not already set on the OpenLayers map.\n *\n * Layers will be added to the OpenLayers map, without affecting any layers that\n * might already be set on the map.\n *\n * Layers added by `apply()` will have two additional properties:\n *\n *  * `mapbox-source`: The `id` of the Mapbox Style document's source that the\n *    OpenLayers layer was created from. Usually `apply()` creates one\n *    OpenLayers layer per Mapbox Style source, unless the layer stack has\n *    layers from different sources in between.\n *  * `mapbox-layers`: The `id`s of the Mapbox Style document's layers that are\n *    included in the OpenLayers layer.\n *\n * This function sets an additional `mapbox-style` property on the OpenLayers\n * map instance, which holds the Mapbox Style object.\n *\n * @param {ol.Map|HTMLElement|string} map Either an existing OpenLayers Map\n * instance, or a HTML element, or the id of a HTML element that will be the\n * target of a new OpenLayers Map.\n * @param {string|Object} style JSON style object or style url pointing to a\n * Mapbox Style object. When using Mapbox APIs, the url must contain an access\n * token and look like\n * `https://api.mapbox.com/styles/v1/mapbox/bright-v9?access_token=[your_access_token_here]`.\n * When passed as JSON style object, all OpenLayers layers created by `apply()`\n * will be immediately available, but they may not have a source yet (i.e. when\n * they are defined by a TileJSON url in the Mapbox Style document). When passed\n * as style url, layers will be added to the map when the Mapbox Style document\n * is loaded and parsed.\n * @return {Promise} A promise that resolves after all layers have been added to\n * the OpenLayers Map instance, their sources set, and their styles applied. the\n * `resolve` callback will be called with the OpenLayers Map instance as\n * argument.\n */\nexport default function olms(map, style) {\n\n  let accessToken, baseUrl, host, path, promise;\n  accessToken = baseUrl = host = path = '';\n\n  if (!(map instanceof Map)) {\n    map = new Map({\n      target: map\n    });\n  }\n\n  if (typeof style === 'string') {\n    const parts = style.match(spriteRegEx);\n    if (parts) {\n      baseUrl = parts[1];\n      accessToken = parts.length > 2 ? parts[2] : '';\n    }\n    promise = new Promise(function(resolve, reject) {\n      fetch(style, {\n        credentials: 'same-origin'\n      })\n        .then(function(response) {\n          return response.json();\n        })\n        .then(function(glStyle) {\n          const a = document.createElement('A');\n          a.href = style;\n          path = a.pathname.split('/').slice(0, -1).join('/') + '/';\n          host = style.substr(0, style.indexOf(path));\n\n          processStyle(glStyle, map, baseUrl, host, path, accessToken)\n            .then(function() {\n              resolve(map);\n            })\n            .catch(reject);\n        })\n        .catch(function(err) {\n          reject(new Error(`Could not load ${style}: ${err.message}`));\n        });\n    });\n  } else {\n    promise = new Promise(function(resolve, reject) {\n      processStyle(style, map)\n        .then(function() {\n          resolve(map);\n        })\n        .catch(reject);\n    });\n  }\n\n  return promise;\n}\n\n/**\n * ```js\n * import {apply} from 'ol-mapbox-style';\n * ```\n * Like `olms`, but returns an `ol.Map` instance instead of a `Promise`.\n *\n * @param {ol.Map|HTMLElement|string} map Either an existing OpenLayers Map\n * instance, or a HTML element, or the id of a HTML element that will be the\n * target of a new OpenLayers Map.\n * @param {string|Object} style JSON style object or style url pointing to a\n * Mapbox Style object. When using Mapbox APIs, the url must contain an access\n * token and look like\n * `https://api.mapbox.com/styles/v1/mapbox/bright-v9?access_token=[your_access_token_here]`.\n * When passed as JSON style object, all OpenLayers layers created by `apply()`\n * will be immediately available, but they may not have a source yet (i.e. when\n * they are defined by a TileJSON url in the Mapbox Style document). When passed\n * as style url, layers will be added to the map when the Mapbox Style document\n * is loaded and parsed.\n * @return {ol.Map} The OpenLayers Map instance that will be populated with the\n * contents described in the Mapbox Style object.\n */\nexport function apply(map, style) {\n  if (!(map instanceof Map)) {\n    map = new Map({\n      target: map\n    });\n  }\n  setTimeout(function() {\n    olms(map, style);\n  }, 0);\n  return map;\n}\n\n\n/**\n * @private\n * If layerIds is not empty, applies the style specified in glStyle to the layer,\n * and adds the layer to the map.\n *\n * The layer may not yet have a source when the function is called.  If so, the style\n * is applied to the layer via a once listener on the 'change:source' event.\n *\n * @param {ol.layer.Layer} layer An OpenLayers layer instance.\n * @param {Array<string>} layerIds Array containing layer ids of already-processed layers.\n * @param {Object} glStyle Style as a JSON object.\n * @param {string|undefined} path The path part of the style URL. Only required\n * when a relative path is used with the `\"sprite\"` property of the style.\n * @param {ol.Map} map OpenLayers Map.\n * @return {Promise} Returns a promise that resolves after the source has\n * been set on the specified layer, and the style has been applied.\n */\nfunction finalizeLayer(layer, layerIds, glStyle, path, map) {\n  return new Promise(function(resolve, reject) {\n    const setStyle = function() {\n      const source = layer.getSource();\n      if (source instanceof VectorSource || source instanceof VectorTileSource) {\n        applyStyle(layer, glStyle, layerIds, path).then(function() {\n          layer.setVisible(true);\n          resolve();\n        }, function(e) {\n          reject(e);\n        });\n      } else {\n        if (!source || source.getState() === 'error') {\n          reject(new Error('Error accessing data for source ' + layer.get('mapbox-source')));\n        } else {\n          resolve();\n        }\n      }\n    };\n\n    layer.set('mapbox-layers', layerIds);\n    if (map.getLayers().getArray().indexOf(layer) === -1) {\n      map.addLayer(layer);\n    }\n\n    if (layer.getSource()) {\n      setStyle();\n    } else {\n      layer.once('change:source', setStyle);\n    }\n  });\n}\n\n\n/**\n * ```js\n * import {getLayer} from 'ol-mapbox-style';\n * ```\n * Get the OpenLayers layer instance that contains the provided Mapbox Style\n * `layer`. Note that multiple Mapbox Style layers are combined in a single\n * OpenLayers layer instance when they use the same Mapbox Style `source`.\n * @param {ol.Map} map OpenLayers Map.\n * @param {string} layerId Mapbox Style layer id.\n * @return {ol.layer.Layer} layer OpenLayers layer instance.\n */\nexport function getLayer(map, layerId) {\n  const layers = map.getLayers().getArray();\n  for (let i = 0, ii = layers.length; i < ii; ++i) {\n    if (layers[i].get('mapbox-layers').indexOf(layerId) !== -1) {\n      return layers[i];\n    }\n  }\n}\n\n/**\n * ```js\n * import {getSource} from 'ol-mapbox-style';\n * ```\n * Get the OpenLayers source instance for the provided Mapbox Style `source`.\n * @param {ol.Map} map OpenLayers Map.\n * @param {string} sourceId Mapbox Style source id.\n * @return {ol.layer.Layer} layer OpenLayers layer instance.\n */\nexport function getSource(map, sourceId) {\n  const layers = map.getLayers().getArray();\n  for (let i = 0, ii = layers.length; i < ii; ++i) {\n    const source = layers[i].getSource();\n    if (layers[i].get('mapbox-source').indexOf(sourceId) !== -1) {\n      return source;\n    }\n  }\n}\n","/**\n * @module ol/color\n */\nimport {assert} from './asserts.js';\nimport {clamp} from './math.js';\n\n\n/**\n * A color represented as a short array [red, green, blue, alpha].\n * red, green, and blue should be integers in the range 0..255 inclusive.\n * alpha should be a float in the range 0..1 inclusive. If no alpha value is\n * given then `1` will be used.\n * @typedef {Array<number>} Color\n * @api\n */\n\n\n/**\n * This RegExp matches # followed by 3, 4, 6, or 8 hex digits.\n * @const\n * @type {RegExp}\n * @private\n */\nconst HEX_COLOR_RE_ = /^#([a-f0-9]{3}|[a-f0-9]{4}(?:[a-f0-9]{2}){0,2})$/i;\n\n\n/**\n * Regular expression for matching potential named color style strings.\n * @const\n * @type {RegExp}\n * @private\n */\nconst NAMED_COLOR_RE_ = /^([a-z]*)$/i;\n\n\n/**\n * Return the color as an rgba string.\n * @param {module:ol/color~Color|string} color Color.\n * @return {string} Rgba string.\n * @api\n */\nexport function asString(color) {\n  if (typeof color === 'string') {\n    return color;\n  } else {\n    return toString(color);\n  }\n}\n\n/**\n * Return named color as an rgba string.\n * @param {string} color Named color.\n * @return {string} Rgb string.\n */\nfunction fromNamed(color) {\n  const el = document.createElement('div');\n  el.style.color = color;\n  if (el.style.color !== '') {\n    document.body.appendChild(el);\n    const rgb = getComputedStyle(el).color;\n    document.body.removeChild(el);\n    return rgb;\n  } else {\n    return '';\n  }\n}\n\n\n/**\n * @param {string} s String.\n * @return {module:ol/color~Color} Color.\n */\nexport const fromString = (\n  function() {\n\n    // We maintain a small cache of parsed strings.  To provide cheap LRU-like\n    // semantics, whenever the cache grows too large we simply delete an\n    // arbitrary 25% of the entries.\n\n    /**\n     * @const\n     * @type {number}\n     */\n    const MAX_CACHE_SIZE = 1024;\n\n    /**\n     * @type {Object<string, module:ol/color~Color>}\n     */\n    const cache = {};\n\n    /**\n     * @type {number}\n     */\n    let cacheSize = 0;\n\n    return (\n      /**\n       * @param {string} s String.\n       * @return {module:ol/color~Color} Color.\n       */\n      function(s) {\n        let color;\n        if (cache.hasOwnProperty(s)) {\n          color = cache[s];\n        } else {\n          if (cacheSize >= MAX_CACHE_SIZE) {\n            let i = 0;\n            for (const key in cache) {\n              if ((i++ & 3) === 0) {\n                delete cache[key];\n                --cacheSize;\n              }\n            }\n          }\n          color = fromStringInternal_(s);\n          cache[s] = color;\n          ++cacheSize;\n        }\n        return color;\n      }\n    );\n\n  })();\n\n/**\n * Return the color as an array. This function maintains a cache of calculated\n * arrays which means the result should not be modified.\n * @param {module:ol/color~Color|string} color Color.\n * @return {module:ol/color~Color} Color.\n * @api\n */\nexport function asArray(color) {\n  if (Array.isArray(color)) {\n    return color;\n  } else {\n    return fromString(/** @type {string} */ (color));\n  }\n}\n\n/**\n * @param {string} s String.\n * @private\n * @return {module:ol/color~Color} Color.\n */\nfunction fromStringInternal_(s) {\n  let r, g, b, a, color;\n\n  if (NAMED_COLOR_RE_.exec(s)) {\n    s = fromNamed(s);\n  }\n\n  if (HEX_COLOR_RE_.exec(s)) { // hex\n    const n = s.length - 1; // number of hex digits\n    let d; // number of digits per channel\n    if (n <= 4) {\n      d = 1;\n    } else {\n      d = 2;\n    }\n    const hasAlpha = n === 4 || n === 8;\n    r = parseInt(s.substr(1 + 0 * d, d), 16);\n    g = parseInt(s.substr(1 + 1 * d, d), 16);\n    b = parseInt(s.substr(1 + 2 * d, d), 16);\n    if (hasAlpha) {\n      a = parseInt(s.substr(1 + 3 * d, d), 16);\n    } else {\n      a = 255;\n    }\n    if (d == 1) {\n      r = (r << 4) + r;\n      g = (g << 4) + g;\n      b = (b << 4) + b;\n      if (hasAlpha) {\n        a = (a << 4) + a;\n      }\n    }\n    color = [r, g, b, a / 255];\n  } else if (s.indexOf('rgba(') == 0) { // rgba()\n    color = s.slice(5, -1).split(',').map(Number);\n    normalize(color);\n  } else if (s.indexOf('rgb(') == 0) { // rgb()\n    color = s.slice(4, -1).split(',').map(Number);\n    color.push(1);\n    normalize(color);\n  } else {\n    assert(false, 14); // Invalid color\n  }\n  return (\n    /** @type {module:ol/color~Color} */ (color)\n  );\n}\n\n\n/**\n * TODO this function is only used in the test, we probably shouldn't export it\n * @param {module:ol/color~Color} color Color.\n * @return {module:ol/color~Color} Clamped color.\n */\nexport function normalize(color) {\n  color[0] = clamp((color[0] + 0.5) | 0, 0, 255);\n  color[1] = clamp((color[1] + 0.5) | 0, 0, 255);\n  color[2] = clamp((color[2] + 0.5) | 0, 0, 255);\n  color[3] = clamp(color[3], 0, 1);\n  return color;\n}\n\n\n/**\n * @param {module:ol/color~Color} color Color.\n * @return {string} String.\n */\nexport function toString(color) {\n  let r = color[0];\n  if (r != (r | 0)) {\n    r = (r + 0.5) | 0;\n  }\n  let g = color[1];\n  if (g != (g | 0)) {\n    g = (g + 0.5) | 0;\n  }\n  let b = color[2];\n  if (b != (b | 0)) {\n    b = (b + 0.5) | 0;\n  }\n  const a = color[3] === undefined ? 1 : color[3];\n  return 'rgba(' + r + ',' + g + ',' + b + ',' + a + ')';\n}\n","/**\n * @module ol/geom/flat/contains\n */\nimport {forEachCorner} from '../../extent.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {boolean} Contains extent.\n */\nexport function linearRingContainsExtent(flatCoordinates, offset, end, stride, extent) {\n  const outside = forEachCorner(extent,\n    /**\n     * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n     * @return {boolean} Contains (x, y).\n     */\n    function(coordinate) {\n      return !linearRingContainsXY(flatCoordinates, offset, end, stride, coordinate[0], coordinate[1]);\n    });\n  return !outside;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} x X.\n * @param {number} y Y.\n * @return {boolean} Contains (x, y).\n */\nexport function linearRingContainsXY(flatCoordinates, offset, end, stride, x, y) {\n  // http://geomalgorithms.com/a03-_inclusion.html\n  // Copyright 2000 softSurfer, 2012 Dan Sunday\n  // This code may be freely used and modified for any purpose\n  // providing that this copyright notice is included with it.\n  // SoftSurfer makes no warranty for this code, and cannot be held\n  // liable for any real or imagined damage resulting from its use.\n  // Users of this code must verify correctness for their application.\n  let wn = 0;\n  let x1 = flatCoordinates[end - stride];\n  let y1 = flatCoordinates[end - stride + 1];\n  for (; offset < end; offset += stride) {\n    const x2 = flatCoordinates[offset];\n    const y2 = flatCoordinates[offset + 1];\n    if (y1 <= y) {\n      if (y2 > y && ((x2 - x1) * (y - y1)) - ((x - x1) * (y2 - y1)) > 0) {\n        wn++;\n      }\n    } else if (y2 <= y && ((x2 - x1) * (y - y1)) - ((x - x1) * (y2 - y1)) < 0) {\n      wn--;\n    }\n    x1 = x2;\n    y1 = y2;\n  }\n  return wn !== 0;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {number} x X.\n * @param {number} y Y.\n * @return {boolean} Contains (x, y).\n */\nexport function linearRingsContainsXY(flatCoordinates, offset, ends, stride, x, y) {\n  if (ends.length === 0) {\n    return false;\n  }\n  if (!linearRingContainsXY(flatCoordinates, offset, ends[0], stride, x, y)) {\n    return false;\n  }\n  for (let i = 1, ii = ends.length; i < ii; ++i) {\n    if (linearRingContainsXY(flatCoordinates, ends[i - 1], ends[i], stride, x, y)) {\n      return false;\n    }\n  }\n  return true;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {number} x X.\n * @param {number} y Y.\n * @return {boolean} Contains (x, y).\n */\nexport function linearRingssContainsXY(flatCoordinates, offset, endss, stride, x, y) {\n  if (endss.length === 0) {\n    return false;\n  }\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    if (linearRingsContainsXY(flatCoordinates, offset, ends, stride, x, y)) {\n      return true;\n    }\n    offset = ends[ends.length - 1];\n  }\n  return false;\n}\n","/**\n * @module ol/coordinate\n */\nimport {modulo} from './math.js';\nimport {padNumber} from './string.js';\n\n\n/**\n * An array of numbers representing an xy coordinate. Example: `[16, 48]`.\n * @typedef {Array<number>} Coordinate\n * @api\n */\n\n\n/**\n * A function that takes a {@link module:ol/coordinate~Coordinate} and\n * transforms it into a `{string}`.\n *\n * @typedef {function((module:ol/coordinate~Coordinate|undefined)): string} CoordinateFormat\n * @api\n */\n\n\n/**\n * Add `delta` to `coordinate`. `coordinate` is modified in place and returned\n * by the function.\n *\n * Example:\n *\n *     import {add} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     add(coord, [-2, 4]);\n *     // coord is now [5.85, 51.983333]\n *\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @param {module:ol/coordinate~Coordinate} delta Delta.\n * @return {module:ol/coordinate~Coordinate} The input coordinate adjusted by\n * the given delta.\n * @api\n */\nexport function add(coordinate, delta) {\n  coordinate[0] += delta[0];\n  coordinate[1] += delta[1];\n  return coordinate;\n}\n\n\n/**\n * Calculates the point closest to the passed coordinate on the passed circle.\n *\n * @param {module:ol/coordinate~Coordinate} coordinate The coordinate.\n * @param {module:ol/geom/Circle} circle The circle.\n * @return {module:ol/coordinate~Coordinate} Closest point on the circumference.\n */\nexport function closestOnCircle(coordinate, circle) {\n  const r = circle.getRadius();\n  const center = circle.getCenter();\n  const x0 = center[0];\n  const y0 = center[1];\n  const x1 = coordinate[0];\n  const y1 = coordinate[1];\n\n  let dx = x1 - x0;\n  const dy = y1 - y0;\n  if (dx === 0 && dy === 0) {\n    dx = 1;\n  }\n  const d = Math.sqrt(dx * dx + dy * dy);\n\n  const x = x0 + r * dx / d;\n  const y = y0 + r * dy / d;\n\n  return [x, y];\n}\n\n\n/**\n * Calculates the point closest to the passed coordinate on the passed segment.\n * This is the foot of the perpendicular of the coordinate to the segment when\n * the foot is on the segment, or the closest segment coordinate when the foot\n * is outside the segment.\n *\n * @param {module:ol/coordinate~Coordinate} coordinate The coordinate.\n * @param {Array<module:ol/coordinate~Coordinate>} segment The two coordinates\n * of the segment.\n * @return {module:ol/coordinate~Coordinate} The foot of the perpendicular of\n * the coordinate to the segment.\n */\nexport function closestOnSegment(coordinate, segment) {\n  const x0 = coordinate[0];\n  const y0 = coordinate[1];\n  const start = segment[0];\n  const end = segment[1];\n  const x1 = start[0];\n  const y1 = start[1];\n  const x2 = end[0];\n  const y2 = end[1];\n  const dx = x2 - x1;\n  const dy = y2 - y1;\n  const along = (dx === 0 && dy === 0) ? 0 :\n    ((dx * (x0 - x1)) + (dy * (y0 - y1))) / ((dx * dx + dy * dy) || 0);\n  let x, y;\n  if (along <= 0) {\n    x = x1;\n    y = y1;\n  } else if (along >= 1) {\n    x = x2;\n    y = y2;\n  } else {\n    x = x1 + along * dx;\n    y = y1 + along * dy;\n  }\n  return [x, y];\n}\n\n\n/**\n * Returns a {@link module:ol/coordinate~CoordinateFormat} function that can be\n * used to format\n * a {module:ol/coordinate~Coordinate} to a string.\n *\n * Example without specifying the fractional digits:\n *\n *     import {createStringXY} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var stringifyFunc = createStringXY();\n *     var out = stringifyFunc(coord);\n *     // out is now '8, 48'\n *\n * Example with explicitly specifying 2 fractional digits:\n *\n *     import {createStringXY} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var stringifyFunc = createStringXY(2);\n *     var out = stringifyFunc(coord);\n *     // out is now '7.85, 47.98'\n *\n * @param {number=} opt_fractionDigits The number of digits to include\n *    after the decimal point. Default is `0`.\n * @return {module:ol/coordinate~CoordinateFormat} Coordinate format.\n * @api\n */\nexport function createStringXY(opt_fractionDigits) {\n  return (\n    /**\n     * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n     * @return {string} String XY.\n     */\n    function(coordinate) {\n      return toStringXY(coordinate, opt_fractionDigits);\n    }\n  );\n}\n\n\n/**\n * @param {string} hemispheres Hemispheres.\n * @param {number} degrees Degrees.\n * @param {number=} opt_fractionDigits The number of digits to include\n *    after the decimal point. Default is `0`.\n * @return {string} String.\n */\nexport function degreesToStringHDMS(hemispheres, degrees, opt_fractionDigits) {\n  const normalizedDegrees = modulo(degrees + 180, 360) - 180;\n  const x = Math.abs(3600 * normalizedDegrees);\n  const dflPrecision = opt_fractionDigits || 0;\n  const precision = Math.pow(10, dflPrecision);\n\n  let deg = Math.floor(x / 3600);\n  let min = Math.floor((x - deg * 3600) / 60);\n  let sec = x - (deg * 3600) - (min * 60);\n  sec = Math.ceil(sec * precision) / precision;\n\n  if (sec >= 60) {\n    sec = 0;\n    min += 1;\n  }\n\n  if (min >= 60) {\n    min = 0;\n    deg += 1;\n  }\n\n  return deg + '\\u00b0 ' + padNumber(min, 2) + '\\u2032 ' +\n    padNumber(sec, 2, dflPrecision) + '\\u2033' +\n    (normalizedDegrees == 0 ? '' : ' ' + hemispheres.charAt(normalizedDegrees < 0 ? 1 : 0));\n}\n\n\n/**\n * Transforms the given {@link module:ol/coordinate~Coordinate} to a string\n * using the given string template. The strings `{x}` and `{y}` in the template\n * will be replaced with the first and second coordinate values respectively.\n *\n * Example without specifying the fractional digits:\n *\n *     import {format} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var template = 'Coordinate is ({x}|{y}).';\n *     var out = format(coord, template);\n *     // out is now 'Coordinate is (8|48).'\n *\n * Example explicitly specifying the fractional digits:\n *\n *     import {format} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var template = 'Coordinate is ({x}|{y}).';\n *     var out = format(coord, template, 2);\n *     // out is now 'Coordinate is (7.85|47.98).'\n *\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @param {string} template A template string with `{x}` and `{y}` placeholders\n *     that will be replaced by first and second coordinate values.\n * @param {number=} opt_fractionDigits The number of digits to include\n *    after the decimal point. Default is `0`.\n * @return {string} Formatted coordinate.\n * @api\n */\nexport function format(coordinate, template, opt_fractionDigits) {\n  if (coordinate) {\n    return template\n      .replace('{x}', coordinate[0].toFixed(opt_fractionDigits))\n      .replace('{y}', coordinate[1].toFixed(opt_fractionDigits));\n  } else {\n    return '';\n  }\n}\n\n\n/**\n * @param {module:ol/coordinate~Coordinate} coordinate1 First coordinate.\n * @param {module:ol/coordinate~Coordinate} coordinate2 Second coordinate.\n * @return {boolean} The two coordinates are equal.\n */\nexport function equals(coordinate1, coordinate2) {\n  let equals = true;\n  for (let i = coordinate1.length - 1; i >= 0; --i) {\n    if (coordinate1[i] != coordinate2[i]) {\n      equals = false;\n      break;\n    }\n  }\n  return equals;\n}\n\n\n/**\n * Rotate `coordinate` by `angle`. `coordinate` is modified in place and\n * returned by the function.\n *\n * Example:\n *\n *     import {rotate} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var rotateRadians = Math.PI / 2; // 90 degrees\n *     rotate(coord, rotateRadians);\n *     // coord is now [-47.983333, 7.85]\n *\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @param {number} angle Angle in radian.\n * @return {module:ol/coordinate~Coordinate} Coordinate.\n * @api\n */\nexport function rotate(coordinate, angle) {\n  const cosAngle = Math.cos(angle);\n  const sinAngle = Math.sin(angle);\n  const x = coordinate[0] * cosAngle - coordinate[1] * sinAngle;\n  const y = coordinate[1] * cosAngle + coordinate[0] * sinAngle;\n  coordinate[0] = x;\n  coordinate[1] = y;\n  return coordinate;\n}\n\n\n/**\n * Scale `coordinate` by `scale`. `coordinate` is modified in place and returned\n * by the function.\n *\n * Example:\n *\n *     import {scale as scaleCoordinate} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var scale = 1.2;\n *     scaleCoordinate(coord, scale);\n *     // coord is now [9.42, 57.5799996]\n *\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @param {number} scale Scale factor.\n * @return {module:ol/coordinate~Coordinate} Coordinate.\n */\nexport function scale(coordinate, scale) {\n  coordinate[0] *= scale;\n  coordinate[1] *= scale;\n  return coordinate;\n}\n\n\n/**\n * @param {module:ol/coordinate~Coordinate} coord1 First coordinate.\n * @param {module:ol/coordinate~Coordinate} coord2 Second coordinate.\n * @return {number} Squared distance between coord1 and coord2.\n */\nexport function squaredDistance(coord1, coord2) {\n  const dx = coord1[0] - coord2[0];\n  const dy = coord1[1] - coord2[1];\n  return dx * dx + dy * dy;\n}\n\n\n/**\n * @param {module:ol/coordinate~Coordinate} coord1 First coordinate.\n * @param {module:ol/coordinate~Coordinate} coord2 Second coordinate.\n * @return {number} Distance between coord1 and coord2.\n */\nexport function distance(coord1, coord2) {\n  return Math.sqrt(squaredDistance(coord1, coord2));\n}\n\n\n/**\n * Calculate the squared distance from a coordinate to a line segment.\n *\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate of the point.\n * @param {Array<module:ol/coordinate~Coordinate>} segment Line segment (2\n * coordinates).\n * @return {number} Squared distance from the point to the line segment.\n */\nexport function squaredDistanceToSegment(coordinate, segment) {\n  return squaredDistance(coordinate,\n    closestOnSegment(coordinate, segment));\n}\n\n\n/**\n * Format a geographic coordinate with the hemisphere, degrees, minutes, and\n * seconds.\n *\n * Example without specifying fractional digits:\n *\n *     import {toStringHDMS} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var out = toStringHDMS(coord);\n *     // out is now '47° 58′ 60″ N 7° 50′ 60″ E'\n *\n * Example explicitly specifying 1 fractional digit:\n *\n *     import {toStringHDMS} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var out = toStringHDMS(coord, 1);\n *     // out is now '47° 58′ 60.0″ N 7° 50′ 60.0″ E'\n *\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @param {number=} opt_fractionDigits The number of digits to include\n *    after the decimal point. Default is `0`.\n * @return {string} Hemisphere, degrees, minutes and seconds.\n * @api\n */\nexport function toStringHDMS(coordinate, opt_fractionDigits) {\n  if (coordinate) {\n    return degreesToStringHDMS('NS', coordinate[1], opt_fractionDigits) + ' ' +\n        degreesToStringHDMS('EW', coordinate[0], opt_fractionDigits);\n  } else {\n    return '';\n  }\n}\n\n\n/**\n * Format a coordinate as a comma delimited string.\n *\n * Example without specifying fractional digits:\n *\n *     import {toStringXY} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var out = toStringXY(coord);\n *     // out is now '8, 48'\n *\n * Example explicitly specifying 1 fractional digit:\n *\n *     import {toStringXY} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var out = toStringXY(coord, 1);\n *     // out is now '7.8, 48.0'\n *\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @param {number=} opt_fractionDigits The number of digits to include\n *    after the decimal point. Default is `0`.\n * @return {string} XY.\n * @api\n */\nexport function toStringXY(coordinate, opt_fractionDigits) {\n  return format(coordinate, '{x}, {y}', opt_fractionDigits);\n}\n","/**\n * @module ol/layer/VectorTileRenderType\n */\n\n/**\n * @enum {string}\n * Render mode for vector tiles:\n *  * `'image'`: Vector tiles are rendered as images. Great performance, but\n *    point symbols and texts are always rotated with the view and pixels are\n *    scaled during zoom animations.\n *  * `'hybrid'`: Polygon and line elements are rendered as images, so pixels\n *    are scaled during zoom animations. Point symbols and texts are accurately\n *    rendered as vectors and can stay upright on rotated views.\n *  * `'vector'`: Vector tiles are rendered as vectors. Most accurate rendering\n *    even during animations, but slower performance than the other options.\n * @api\n */\nexport default {\n  IMAGE: 'image',\n  HYBRID: 'hybrid',\n  VECTOR: 'vector'\n};\n","/**\n * @module ol/geom/Point\n */\nimport {createOrUpdateFromCoordinate, containsXY} from '../extent.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport SimpleGeometry from '../geom/SimpleGeometry.js';\nimport {deflateCoordinate} from '../geom/flat/deflate.js';\nimport {squaredDistance as squaredDx} from '../math.js';\n\n/**\n * @classdesc\n * Point geometry.\n *\n * @api\n */\nclass Point extends SimpleGeometry {\n\n  /**\n   * @param {module:ol/coordinate~Coordinate} coordinates Coordinates.\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   */\n  constructor(coordinates, opt_layout) {\n    super();\n    this.setCoordinates(coordinates, opt_layout);\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!module:ol/geom/Point} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    const point = new Point(this.flatCoordinates.slice(), this.layout);\n    return point;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    const flatCoordinates = this.flatCoordinates;\n    const squaredDistance = squaredDx(x, y, flatCoordinates[0], flatCoordinates[1]);\n    if (squaredDistance < minSquaredDistance) {\n      const stride = this.stride;\n      for (let i = 0; i < stride; ++i) {\n        closestPoint[i] = flatCoordinates[i];\n      }\n      closestPoint.length = stride;\n      return squaredDistance;\n    } else {\n      return minSquaredDistance;\n    }\n  }\n\n  /**\n   * Return the coordinate of the point.\n   * @return {module:ol/coordinate~Coordinate} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates() {\n    return !this.flatCoordinates ? [] : this.flatCoordinates.slice();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  computeExtent(extent) {\n    return createOrUpdateFromCoordinate(this.flatCoordinates, extent);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.POINT;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    return containsXY(extent, this.flatCoordinates[0], this.flatCoordinates[1]);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 0);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    this.flatCoordinates.length = deflateCoordinate(\n      this.flatCoordinates, 0, coordinates, this.stride);\n    this.changed();\n  }\n}\n\n\nexport default Point;\n","/**\n * @module ol/layer/Layer\n */\nimport {listen, unlistenByKey} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {getUid} from '../util.js';\nimport {getChangeEventType} from '../Object.js';\nimport BaseLayer from '../layer/Base.js';\nimport LayerProperty from '../layer/Property.js';\nimport {assign} from '../obj.js';\nimport RenderEventType from '../render/EventType.js';\nimport SourceState from '../source/State.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [opacity=1] Opacity (0, 1).\n * @property {boolean} [visible=true] Visibility.\n * @property {module:ol/extent~Extent} [extent] The bounding extent for layer rendering.  The layer will not be\n * rendered outside of this extent.\n * @property {number} [zIndex=0] The z-index for layer rendering.  At rendering time, the layers\n * will be ordered, first by Z-index and then by position.\n * @property {number} [minResolution] The minimum resolution (inclusive) at which this layer will be\n * visible.\n * @property {number} [maxResolution] The maximum resolution (exclusive) below which this layer will\n * be visible.\n * @property {module:ol/source/Source} [source] Source for this layer.  If not provided to the constructor,\n * the source can be set by calling {@link module:ol/layer/Layer#setSource layer.setSource(source)} after\n * construction.\n */\n\n\n/**\n * @typedef {Object} State\n * @property {module:ol/layer/Layer} layer\n * @property {number} opacity\n * @property {module:ol/source/Source~State} sourceState\n * @property {boolean} visible\n * @property {boolean} managed\n * @property {module:ol/extent~Extent} [extent]\n * @property {number} zIndex\n * @property {number} maxResolution\n * @property {number} minResolution\n */\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * A visual representation of raster or vector map data.\n * Layers group together those properties that pertain to how the data is to be\n * displayed, irrespective of the source of that data.\n *\n * Layers are usually added to a map with {@link module:ol/Map#addLayer}. Components\n * like {@link module:ol/interaction/Select~Select} use unmanaged layers\n * internally. These unmanaged layers are associated with the map using\n * {@link module:ol/layer/Layer~Layer#setMap} instead.\n *\n * A generic `change` event is fired when the state of the source changes.\n *\n * @fires module:ol/render/Event~RenderEvent\n */\nclass Layer extends BaseLayer {\n  /**\n   * @param {module:ol/layer/Layer~Options} options Layer options.\n   */\n  constructor(options) {\n\n    const baseOptions = assign({}, options);\n    delete baseOptions.source;\n\n    super(baseOptions);\n\n    /**\n     * @private\n     * @type {?module:ol/events~EventsKey}\n     */\n    this.mapPrecomposeKey_ = null;\n\n    /**\n     * @private\n     * @type {?module:ol/events~EventsKey}\n     */\n    this.mapRenderKey_ = null;\n\n    /**\n     * @private\n     * @type {?module:ol/events~EventsKey}\n     */\n    this.sourceChangeKey_ = null;\n\n    if (options.map) {\n      this.setMap(options.map);\n    }\n\n    listen(this,\n      getChangeEventType(LayerProperty.SOURCE),\n      this.handleSourcePropertyChange_, this);\n\n    const source = options.source ? options.source : null;\n    this.setSource(source);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getLayersArray(opt_array) {\n    const array = opt_array ? opt_array : [];\n    array.push(this);\n    return array;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getLayerStatesArray(opt_states) {\n    const states = opt_states ? opt_states : [];\n    states.push(this.getLayerState());\n    return states;\n  }\n\n  /**\n   * Get the layer source.\n   * @return {module:ol/source/Source} The layer source (or `null` if not yet set).\n   * @observable\n   * @api\n   */\n  getSource() {\n    const source = this.get(LayerProperty.SOURCE);\n    return (\n      /** @type {module:ol/source/Source} */ (source) || null\n    );\n  }\n\n  /**\n    * @inheritDoc\n    */\n  getSourceState() {\n    const source = this.getSource();\n    return !source ? SourceState.UNDEFINED : source.getState();\n  }\n\n  /**\n   * @private\n   */\n  handleSourceChange_() {\n    this.changed();\n  }\n\n  /**\n   * @private\n   */\n  handleSourcePropertyChange_() {\n    if (this.sourceChangeKey_) {\n      unlistenByKey(this.sourceChangeKey_);\n      this.sourceChangeKey_ = null;\n    }\n    const source = this.getSource();\n    if (source) {\n      this.sourceChangeKey_ = listen(source,\n        EventType.CHANGE, this.handleSourceChange_, this);\n    }\n    this.changed();\n  }\n\n  /**\n   * Sets the layer to be rendered on top of other layers on a map. The map will\n   * not manage this layer in its layers collection, and the callback in\n   * {@link module:ol/Map#forEachLayerAtPixel} will receive `null` as layer. This\n   * is useful for temporary layers. To remove an unmanaged layer from the map,\n   * use `#setMap(null)`.\n   *\n   * To add the layer to a map and have it managed by the map, use\n   * {@link module:ol/Map#addLayer} instead.\n   * @param {module:ol/PluggableMap} map Map.\n   * @api\n   */\n  setMap(map) {\n    if (this.mapPrecomposeKey_) {\n      unlistenByKey(this.mapPrecomposeKey_);\n      this.mapPrecomposeKey_ = null;\n    }\n    if (!map) {\n      this.changed();\n    }\n    if (this.mapRenderKey_) {\n      unlistenByKey(this.mapRenderKey_);\n      this.mapRenderKey_ = null;\n    }\n    if (map) {\n      this.mapPrecomposeKey_ = listen(map, RenderEventType.PRECOMPOSE, function(evt) {\n        const layerState = this.getLayerState();\n        layerState.managed = false;\n        if (this.getZIndex() === undefined) {\n          layerState.zIndex = Infinity;\n        }\n        evt.frameState.layerStatesArray.push(layerState);\n        evt.frameState.layerStates[getUid(this)] = layerState;\n      }, this);\n      this.mapRenderKey_ = listen(this, EventType.CHANGE, map.render, map);\n      this.changed();\n    }\n  }\n\n  /**\n   * Set the layer source.\n   * @param {module:ol/source/Source} source The layer source.\n   * @observable\n   * @api\n   */\n  setSource(source) {\n    this.set(LayerProperty.SOURCE, source);\n  }\n}\n\n\n/**\n * Return `true` if the layer is visible, and if the passed resolution is\n * between the layer's minResolution and maxResolution. The comparison is\n * inclusive for `minResolution` and exclusive for `maxResolution`.\n * @param {module:ol/layer/Layer~State} layerState Layer state.\n * @param {number} resolution Resolution.\n * @return {boolean} The layer is visible at the given resolution.\n */\nexport function visibleAtResolution(layerState, resolution) {\n  return layerState.visible && resolution >= layerState.minResolution &&\n      resolution < layerState.maxResolution;\n}\n\n\nexport default Layer;\n","/**\n * @module ol/style/Fill\n */\nimport {getUid} from '../util.js';\nimport {asString} from '../color.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/color~Color|module:ol/colorlike~ColorLike} [color] A color, gradient or pattern.\n * See {@link module:ol/color~Color} and {@link module:ol/colorlike~ColorLike} for possible formats.\n * Default null; if null, the Canvas/renderer default black will be used.\n */\n\n\n/**\n * @classdesc\n * Set fill style for vector features.\n * @api\n */\nclass Fill {\n  /**\n   * @param {module:ol/style/Fill~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n\n    /**\n     * @private\n     * @type {module:ol/color~Color|module:ol/colorlike~ColorLike}\n     */\n    this.color_ = options.color !== undefined ? options.color : null;\n\n    /**\n     * @private\n     * @type {string|undefined}\n     */\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Clones the style. The color is not cloned if it is an {@link module:ol/colorlike~ColorLike}.\n   * @return {module:ol/style/Fill} The cloned style.\n   * @api\n   */\n  clone() {\n    const color = this.getColor();\n    return new Fill({\n      color: (color && color.slice) ? color.slice() : color || undefined\n    });\n  }\n\n  /**\n   * Get the fill color.\n   * @return {module:ol/color~Color|module:ol/colorlike~ColorLike} Color.\n   * @api\n   */\n  getColor() {\n    return this.color_;\n  }\n\n  /**\n   * Set the color.\n   *\n   * @param {module:ol/color~Color|module:ol/colorlike~ColorLike} color Color.\n   * @api\n   */\n  setColor(color) {\n    this.color_ = color;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * @return {string} The checksum.\n   */\n  getChecksum() {\n    if (this.checksum_ === undefined) {\n      if (\n        this.color_ instanceof CanvasPattern ||\n          this.color_ instanceof CanvasGradient\n      ) {\n        this.checksum_ = getUid(this.color_).toString();\n      } else {\n        this.checksum_ = 'f' + (this.color_ ? asString(this.color_) : '-');\n      }\n    }\n\n    return this.checksum_;\n  }\n}\n\nexport default Fill;\n","/**\n * @module ol/ObjectEventType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  /**\n   * Triggered when a property is changed.\n   * @event module:ol/Object~ObjectEvent#propertychange\n   * @api\n   */\n  PROPERTYCHANGE: 'propertychange'\n};\n","/**\n * @module ol/format/FormatType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  ARRAY_BUFFER: 'arraybuffer',\n  JSON: 'json',\n  TEXT: 'text',\n  XML: 'xml'\n};\n","/**\n * @module ol/rotationconstraint\n */\nimport {toRadians} from './math.js';\n\n\n/**\n * @typedef {function((number|undefined), number): (number|undefined)} Type\n */\n\n\n/**\n * @param {number|undefined} rotation Rotation.\n * @param {number} delta Delta.\n * @return {number|undefined} Rotation.\n */\nexport function disable(rotation, delta) {\n  if (rotation !== undefined) {\n    return 0;\n  } else {\n    return undefined;\n  }\n}\n\n\n/**\n * @param {number|undefined} rotation Rotation.\n * @param {number} delta Delta.\n * @return {number|undefined} Rotation.\n */\nexport function none(rotation, delta) {\n  if (rotation !== undefined) {\n    return rotation + delta;\n  } else {\n    return undefined;\n  }\n}\n\n\n/**\n * @param {number} n N.\n * @return {module:ol/rotationconstraint~Type} Rotation constraint.\n */\nexport function createSnapToN(n) {\n  const theta = 2 * Math.PI / n;\n  return (\n    /**\n     * @param {number|undefined} rotation Rotation.\n     * @param {number} delta Delta.\n     * @return {number|undefined} Rotation.\n     */\n    function(rotation, delta) {\n      if (rotation !== undefined) {\n        rotation = Math.floor((rotation + delta) / theta + 0.5) * theta;\n        return rotation;\n      } else {\n        return undefined;\n      }\n    });\n}\n\n\n/**\n * @param {number=} opt_tolerance Tolerance.\n * @return {module:ol/rotationconstraint~Type} Rotation constraint.\n */\nexport function createSnapToZero(opt_tolerance) {\n  const tolerance = opt_tolerance || toRadians(5);\n  return (\n    /**\n     * @param {number|undefined} rotation Rotation.\n     * @param {number} delta Delta.\n     * @return {number|undefined} Rotation.\n     */\n    function(rotation, delta) {\n      if (rotation !== undefined) {\n        if (Math.abs(rotation + delta) <= tolerance) {\n          return 0;\n        } else {\n          return rotation + delta;\n        }\n      } else {\n        return undefined;\n      }\n    });\n}\n","/**\n * @module ol/geom/flat/reverse\n */\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n */\nexport function coordinates(flatCoordinates, offset, end, stride) {\n  while (offset < end - stride) {\n    for (let i = 0; i < stride; ++i) {\n      const tmp = flatCoordinates[offset + i];\n      flatCoordinates[offset + i] = flatCoordinates[end - stride + i];\n      flatCoordinates[end - stride + i] = tmp;\n    }\n    offset += stride;\n    end -= stride;\n  }\n}\n","/**\n * @module ol/geom/flat/orient\n */\nimport {coordinates as reverseCoordinates} from '../flat/reverse.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @return {boolean} Is clockwise.\n */\nexport function linearRingIsClockwise(flatCoordinates, offset, end, stride) {\n  // http://tinyurl.com/clockwise-method\n  // https://github.com/OSGeo/gdal/blob/trunk/gdal/ogr/ogrlinearring.cpp\n  let edge = 0;\n  let x1 = flatCoordinates[end - stride];\n  let y1 = flatCoordinates[end - stride + 1];\n  for (; offset < end; offset += stride) {\n    const x2 = flatCoordinates[offset];\n    const y2 = flatCoordinates[offset + 1];\n    edge += (x2 - x1) * (y2 + y1);\n    x1 = x2;\n    y1 = y2;\n  }\n  return edge > 0;\n}\n\n\n/**\n * Determines if linear rings are oriented.  By default, left-hand orientation\n * is tested (first ring must be clockwise, remaining rings counter-clockwise).\n * To test for right-hand orientation, use the `opt_right` argument.\n *\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Array of end indexes.\n * @param {number} stride Stride.\n * @param {boolean=} opt_right Test for right-hand orientation\n *     (counter-clockwise exterior ring and clockwise interior rings).\n * @return {boolean} Rings are correctly oriented.\n */\nexport function linearRingIsOriented(flatCoordinates, offset, ends, stride, opt_right) {\n  const right = opt_right !== undefined ? opt_right : false;\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    const isClockwise = linearRingIsClockwise(\n      flatCoordinates, offset, end, stride);\n    if (i === 0) {\n      if ((right && isClockwise) || (!right && !isClockwise)) {\n        return false;\n      }\n    } else {\n      if ((right && !isClockwise) || (!right && isClockwise)) {\n        return false;\n      }\n    }\n    offset = end;\n  }\n  return true;\n}\n\n\n/**\n * Determines if linear rings are oriented.  By default, left-hand orientation\n * is tested (first ring must be clockwise, remaining rings counter-clockwise).\n * To test for right-hand orientation, use the `opt_right` argument.\n *\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Array of array of end indexes.\n * @param {number} stride Stride.\n * @param {boolean=} opt_right Test for right-hand orientation\n *     (counter-clockwise exterior ring and clockwise interior rings).\n * @return {boolean} Rings are correctly oriented.\n */\nexport function linearRingsAreOriented(flatCoordinates, offset, endss, stride, opt_right) {\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    if (!linearRingIsOriented(\n      flatCoordinates, offset, endss[i], stride, opt_right)) {\n      return false;\n    }\n  }\n  return true;\n}\n\n\n/**\n * Orient coordinates in a flat array of linear rings.  By default, rings\n * are oriented following the left-hand rule (clockwise for exterior and\n * counter-clockwise for interior rings).  To orient according to the\n * right-hand rule, use the `opt_right` argument.\n *\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {boolean=} opt_right Follow the right-hand rule for orientation.\n * @return {number} End.\n */\nexport function orientLinearRings(flatCoordinates, offset, ends, stride, opt_right) {\n  const right = opt_right !== undefined ? opt_right : false;\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    const isClockwise = linearRingIsClockwise(\n      flatCoordinates, offset, end, stride);\n    const reverse = i === 0 ?\n      (right && isClockwise) || (!right && !isClockwise) :\n      (right && !isClockwise) || (!right && isClockwise);\n    if (reverse) {\n      reverseCoordinates(flatCoordinates, offset, end, stride);\n    }\n    offset = end;\n  }\n  return offset;\n}\n\n\n/**\n * Orient coordinates in a flat array of linear rings.  By default, rings\n * are oriented following the left-hand rule (clockwise for exterior and\n * counter-clockwise for interior rings).  To orient according to the\n * right-hand rule, use the `opt_right` argument.\n *\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Array of array of end indexes.\n * @param {number} stride Stride.\n * @param {boolean=} opt_right Follow the right-hand rule for orientation.\n * @return {number} End.\n */\nexport function orientLinearRingsArray(flatCoordinates, offset, endss, stride, opt_right) {\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    offset = orientLinearRings(\n      flatCoordinates, offset, endss[i], stride, opt_right);\n  }\n  return offset;\n}\n","/**\n * @module ol/style/Stroke\n */\nimport {getUid} from '../util.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/color~Color|module:ol/colorlike~ColorLike} [color] A color, gradient or pattern.\n * See {@link module:ol/color~Color} and {@link module:ol/colorlike~ColorLike} for possible formats.\n * Default null; if null, the Canvas/renderer default black will be used.\n * @property {string} [lineCap='round'] Line cap style: `butt`, `round`, or `square`.\n * @property {string} [lineJoin='round'] Line join style: `bevel`, `round`, or `miter`.\n * @property {Array<number>} [lineDash] Line dash pattern. Default is `undefined` (no dash).\n * Please note that Internet Explorer 10 and lower do not support the `setLineDash` method on\n * the `CanvasRenderingContext2D` and therefore this option will have no visual effect in these browsers.\n * @property {number} [lineDashOffset=0] Line dash offset.\n * @property {number} [miterLimit=10] Miter limit.\n * @property {number} [width] Width.\n */\n\n\n/**\n * @classdesc\n * Set stroke style for vector features.\n * Note that the defaults given are the Canvas defaults, which will be used if\n * option is not defined. The `get` functions return whatever was entered in\n * the options; they will not return the default.\n * @api\n */\nclass Stroke {\n  /**\n   * @param {module:ol/style/Stroke~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n\n    /**\n     * @private\n     * @type {module:ol/color~Color|module:ol/colorlike~ColorLike}\n     */\n    this.color_ = options.color !== undefined ? options.color : null;\n\n    /**\n     * @private\n     * @type {string|undefined}\n     */\n    this.lineCap_ = options.lineCap;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.lineDash_ = options.lineDash !== undefined ? options.lineDash : null;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.lineDashOffset_ = options.lineDashOffset;\n\n    /**\n     * @private\n     * @type {string|undefined}\n     */\n    this.lineJoin_ = options.lineJoin;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.miterLimit_ = options.miterLimit;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.width_ = options.width;\n\n    /**\n     * @private\n     * @type {string|undefined}\n     */\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Clones the style.\n   * @return {module:ol/style/Stroke} The cloned style.\n   * @api\n   */\n  clone() {\n    const color = this.getColor();\n    return new Stroke({\n      color: (color && color.slice) ? color.slice() : color || undefined,\n      lineCap: this.getLineCap(),\n      lineDash: this.getLineDash() ? this.getLineDash().slice() : undefined,\n      lineDashOffset: this.getLineDashOffset(),\n      lineJoin: this.getLineJoin(),\n      miterLimit: this.getMiterLimit(),\n      width: this.getWidth()\n    });\n  }\n\n  /**\n   * Get the stroke color.\n   * @return {module:ol/color~Color|module:ol/colorlike~ColorLike} Color.\n   * @api\n   */\n  getColor() {\n    return this.color_;\n  }\n\n  /**\n   * Get the line cap type for the stroke.\n   * @return {string|undefined} Line cap.\n   * @api\n   */\n  getLineCap() {\n    return this.lineCap_;\n  }\n\n  /**\n   * Get the line dash style for the stroke.\n   * @return {Array<number>} Line dash.\n   * @api\n   */\n  getLineDash() {\n    return this.lineDash_;\n  }\n\n  /**\n   * Get the line dash offset for the stroke.\n   * @return {number|undefined} Line dash offset.\n   * @api\n   */\n  getLineDashOffset() {\n    return this.lineDashOffset_;\n  }\n\n  /**\n   * Get the line join type for the stroke.\n   * @return {string|undefined} Line join.\n   * @api\n   */\n  getLineJoin() {\n    return this.lineJoin_;\n  }\n\n  /**\n   * Get the miter limit for the stroke.\n   * @return {number|undefined} Miter limit.\n   * @api\n   */\n  getMiterLimit() {\n    return this.miterLimit_;\n  }\n\n  /**\n   * Get the stroke width.\n   * @return {number|undefined} Width.\n   * @api\n   */\n  getWidth() {\n    return this.width_;\n  }\n\n  /**\n   * Set the color.\n   *\n   * @param {module:ol/color~Color|module:ol/colorlike~ColorLike} color Color.\n   * @api\n   */\n  setColor(color) {\n    this.color_ = color;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Set the line cap.\n   *\n   * @param {string|undefined} lineCap Line cap.\n   * @api\n   */\n  setLineCap(lineCap) {\n    this.lineCap_ = lineCap;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Set the line dash.\n   *\n   * Please note that Internet Explorer 10 and lower [do not support][mdn] the\n   * `setLineDash` method on the `CanvasRenderingContext2D` and therefore this\n   * property will have no visual effect in these browsers.\n   *\n   * [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash#Browser_compatibility\n   *\n   * @param {Array<number>} lineDash Line dash.\n   * @api\n   */\n  setLineDash(lineDash) {\n    this.lineDash_ = lineDash;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Set the line dash offset.\n   *\n   * @param {number|undefined} lineDashOffset Line dash offset.\n   * @api\n   */\n  setLineDashOffset(lineDashOffset) {\n    this.lineDashOffset_ = lineDashOffset;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Set the line join.\n   *\n   * @param {string|undefined} lineJoin Line join.\n   * @api\n   */\n  setLineJoin(lineJoin) {\n    this.lineJoin_ = lineJoin;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Set the miter limit.\n   *\n   * @param {number|undefined} miterLimit Miter limit.\n   * @api\n   */\n  setMiterLimit(miterLimit) {\n    this.miterLimit_ = miterLimit;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Set the width.\n   *\n   * @param {number|undefined} width Width.\n   * @api\n   */\n  setWidth(width) {\n    this.width_ = width;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * @return {string} The checksum.\n   */\n  getChecksum() {\n    if (this.checksum_ === undefined) {\n      this.checksum_ = 's';\n      if (this.color_) {\n        if (typeof this.color_ === 'string') {\n          this.checksum_ += this.color_;\n        } else {\n          this.checksum_ += getUid(this.color_).toString();\n        }\n      } else {\n        this.checksum_ += '-';\n      }\n      this.checksum_ += ',' +\n          (this.lineCap_ !== undefined ?\n            this.lineCap_.toString() : '-') + ',' +\n          (this.lineDash_ ?\n            this.lineDash_.toString() : '-') + ',' +\n          (this.lineDashOffset_ !== undefined ?\n            this.lineDashOffset_ : '-') + ',' +\n          (this.lineJoin_ !== undefined ?\n            this.lineJoin_ : '-') + ',' +\n          (this.miterLimit_ !== undefined ?\n            this.miterLimit_.toString() : '-') + ',' +\n          (this.width_ !== undefined ?\n            this.width_.toString() : '-');\n    }\n\n    return this.checksum_;\n  }\n}\n\nexport default Stroke;\n","/**\n * @module ol/proj/Projection\n */\nimport {METERS_PER_UNIT} from '../proj/Units.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {string} code The SRS identifier code, e.g. `EPSG:4326`.\n * @property {module:ol/proj/Units|string} [units] Units. Required unless a\n * proj4 projection is defined for `code`.\n * @property {module:ol/extent~Extent} [extent] The validity extent for the SRS.\n * @property {string} [axisOrientation='enu'] The axis orientation as specified in Proj4.\n * @property {boolean} [global=false] Whether the projection is valid for the whole globe.\n * @property {number} [metersPerUnit] The meters per unit for the SRS.\n * If not provided, the `units` are used to get the meters per unit from the {@link module:ol/proj/Units~METERS_PER_UNIT}\n * lookup table.\n * @property {module:ol/extent~Extent} [worldExtent] The world extent for the SRS.\n * @property {function(number, module:ol/coordinate~Coordinate):number} [getPointResolution]\n * Function to determine resolution at a point. The function is called with a\n * `{number}` view resolution and an `{module:ol/coordinate~Coordinate}` as arguments, and returns\n * the `{number}` resolution at the passed coordinate. If this is `undefined`,\n * the default {@link module:ol/proj#getPointResolution} function will be used.\n */\n\n\n/**\n * @classdesc\n * Projection definition class. One of these is created for each projection\n * supported in the application and stored in the {@link module:ol/proj} namespace.\n * You can use these in applications, but this is not required, as API params\n * and options use {@link module:ol/proj~ProjectionLike} which means the simple string\n * code will suffice.\n *\n * You can use {@link module:ol/proj~get} to retrieve the object for a particular\n * projection.\n *\n * The library includes definitions for `EPSG:4326` and `EPSG:3857`, together\n * with the following aliases:\n * * `EPSG:4326`: CRS:84, urn:ogc:def:crs:EPSG:6.6:4326,\n *     urn:ogc:def:crs:OGC:1.3:CRS84, urn:ogc:def:crs:OGC:2:84,\n *     http://www.opengis.net/gml/srs/epsg.xml#4326,\n *     urn:x-ogc:def:crs:EPSG:4326\n * * `EPSG:3857`: EPSG:102100, EPSG:102113, EPSG:900913,\n *     urn:ogc:def:crs:EPSG:6.18:3:3857,\n *     http://www.opengis.net/gml/srs/epsg.xml#3857\n *\n * If you use [proj4js](https://github.com/proj4js/proj4js), aliases can\n * be added using `proj4.defs()`. After all required projection definitions are\n * added, call the {@link module:ol/proj/proj4~register} function.\n *\n * @api\n */\nclass Projection {\n\n  /**\n   * @param {module:ol/proj/Projection~Options} options Projection options.\n   */\n  constructor(options) {\n    /**\n     * @private\n     * @type {string}\n     */\n    this.code_ = options.code;\n\n    /**\n     * Units of projected coordinates. When set to `TILE_PIXELS`, a\n     * `this.extent_` and `this.worldExtent_` must be configured properly for each\n     * tile.\n     * @private\n     * @type {module:ol/proj/Units}\n     */\n    this.units_ = /** @type {module:ol/proj/Units} */ (options.units);\n\n    /**\n     * Validity extent of the projection in projected coordinates. For projections\n     * with `TILE_PIXELS` units, this is the extent of the tile in\n     * tile pixel space.\n     * @private\n     * @type {module:ol/extent~Extent}\n     */\n    this.extent_ = options.extent !== undefined ? options.extent : null;\n\n    /**\n     * Extent of the world in EPSG:4326. For projections with\n     * `TILE_PIXELS` units, this is the extent of the tile in\n     * projected coordinate space.\n     * @private\n     * @type {module:ol/extent~Extent}\n     */\n    this.worldExtent_ = options.worldExtent !== undefined ?\n      options.worldExtent : null;\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.axisOrientation_ = options.axisOrientation !== undefined ?\n      options.axisOrientation : 'enu';\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.global_ = options.global !== undefined ? options.global : false;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.canWrapX_ = !!(this.global_ && this.extent_);\n\n    /**\n     * @private\n     * @type {function(number, module:ol/coordinate~Coordinate):number|undefined}\n     */\n    this.getPointResolutionFunc_ = options.getPointResolution;\n\n    /**\n     * @private\n     * @type {module:ol/tilegrid/TileGrid}\n     */\n    this.defaultTileGrid_ = null;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.metersPerUnit_ = options.metersPerUnit;\n  }\n\n  /**\n   * @return {boolean} The projection is suitable for wrapping the x-axis\n   */\n  canWrapX() {\n    return this.canWrapX_;\n  }\n\n  /**\n   * Get the code for this projection, e.g. 'EPSG:4326'.\n   * @return {string} Code.\n   * @api\n   */\n  getCode() {\n    return this.code_;\n  }\n\n  /**\n   * Get the validity extent for this projection.\n   * @return {module:ol/extent~Extent} Extent.\n   * @api\n   */\n  getExtent() {\n    return this.extent_;\n  }\n\n  /**\n   * Get the units of this projection.\n   * @return {module:ol/proj/Units} Units.\n   * @api\n   */\n  getUnits() {\n    return this.units_;\n  }\n\n  /**\n   * Get the amount of meters per unit of this projection.  If the projection is\n   * not configured with `metersPerUnit` or a units identifier, the return is\n   * `undefined`.\n   * @return {number|undefined} Meters.\n   * @api\n   */\n  getMetersPerUnit() {\n    return this.metersPerUnit_ || METERS_PER_UNIT[this.units_];\n  }\n\n  /**\n   * Get the world extent for this projection.\n   * @return {module:ol/extent~Extent} Extent.\n   * @api\n   */\n  getWorldExtent() {\n    return this.worldExtent_;\n  }\n\n  /**\n   * Get the axis orientation of this projection.\n   * Example values are:\n   * enu - the default easting, northing, elevation.\n   * neu - northing, easting, up - useful for \"lat/long\" geographic coordinates,\n   *     or south orientated transverse mercator.\n   * wnu - westing, northing, up - some planetary coordinate systems have\n   *     \"west positive\" coordinate systems\n   * @return {string} Axis orientation.\n   * @api\n   */\n  getAxisOrientation() {\n    return this.axisOrientation_;\n  }\n\n  /**\n   * Is this projection a global projection which spans the whole world?\n   * @return {boolean} Whether the projection is global.\n   * @api\n   */\n  isGlobal() {\n    return this.global_;\n  }\n\n  /**\n   * Set if the projection is a global projection which spans the whole world\n   * @param {boolean} global Whether the projection is global.\n   * @api\n   */\n  setGlobal(global) {\n    this.global_ = global;\n    this.canWrapX_ = !!(global && this.extent_);\n  }\n\n  /**\n   * @return {module:ol/tilegrid/TileGrid} The default tile grid.\n   */\n  getDefaultTileGrid() {\n    return this.defaultTileGrid_;\n  }\n\n  /**\n   * @param {module:ol/tilegrid/TileGrid} tileGrid The default tile grid.\n   */\n  setDefaultTileGrid(tileGrid) {\n    this.defaultTileGrid_ = tileGrid;\n  }\n\n  /**\n   * Set the validity extent for this projection.\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @api\n   */\n  setExtent(extent) {\n    this.extent_ = extent;\n    this.canWrapX_ = !!(this.global_ && extent);\n  }\n\n  /**\n   * Set the world extent for this projection.\n   * @param {module:ol/extent~Extent} worldExtent World extent\n   *     [minlon, minlat, maxlon, maxlat].\n   * @api\n   */\n  setWorldExtent(worldExtent) {\n    this.worldExtent_ = worldExtent;\n  }\n\n  /**\n   * Set the getPointResolution function (see {@link module:ol/proj~getPointResolution}\n   * for this projection.\n   * @param {function(number, module:ol/coordinate~Coordinate):number} func Function\n   * @api\n   */\n  setGetPointResolution(func) {\n    this.getPointResolutionFunc_ = func;\n  }\n\n  /**\n   * Get the custom point resolution function for this projection (if set).\n   * @return {function(number, module:ol/coordinate~Coordinate):number|undefined} The custom point\n   * resolution function (if set).\n   */\n  getPointResolutionFunc() {\n    return this.getPointResolutionFunc_;\n  }\n}\n\nexport default Projection;\n","/**\n * @module ol/geom/flat/interpolate\n */\nimport {binarySearch} from '../../array.js';\nimport {lerp} from '../../math.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} fraction Fraction.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Destination.\n */\nexport function interpolatePoint(flatCoordinates, offset, end, stride, fraction, opt_dest) {\n  let pointX = NaN;\n  let pointY = NaN;\n  const n = (end - offset) / stride;\n  if (n === 1) {\n    pointX = flatCoordinates[offset];\n    pointY = flatCoordinates[offset + 1];\n  } else if (n == 2) {\n    pointX = (1 - fraction) * flatCoordinates[offset] +\n        fraction * flatCoordinates[offset + stride];\n    pointY = (1 - fraction) * flatCoordinates[offset + 1] +\n        fraction * flatCoordinates[offset + stride + 1];\n  } else if (n !== 0) {\n    let x1 = flatCoordinates[offset];\n    let y1 = flatCoordinates[offset + 1];\n    let length = 0;\n    const cumulativeLengths = [0];\n    for (let i = offset + stride; i < end; i += stride) {\n      const x2 = flatCoordinates[i];\n      const y2 = flatCoordinates[i + 1];\n      length += Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));\n      cumulativeLengths.push(length);\n      x1 = x2;\n      y1 = y2;\n    }\n    const target = fraction * length;\n    const index = binarySearch(cumulativeLengths, target);\n    if (index < 0) {\n      const t = (target - cumulativeLengths[-index - 2]) /\n          (cumulativeLengths[-index - 1] - cumulativeLengths[-index - 2]);\n      const o = offset + (-index - 2) * stride;\n      pointX = lerp(\n        flatCoordinates[o], flatCoordinates[o + stride], t);\n      pointY = lerp(\n        flatCoordinates[o + 1], flatCoordinates[o + stride + 1], t);\n    } else {\n      pointX = flatCoordinates[offset + index * stride];\n      pointY = flatCoordinates[offset + index * stride + 1];\n    }\n  }\n  if (opt_dest) {\n    opt_dest[0] = pointX;\n    opt_dest[1] = pointY;\n    return opt_dest;\n  } else {\n    return [pointX, pointY];\n  }\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} m M.\n * @param {boolean} extrapolate Extrapolate.\n * @return {module:ol/coordinate~Coordinate} Coordinate.\n */\nexport function lineStringCoordinateAtM(flatCoordinates, offset, end, stride, m, extrapolate) {\n  if (end == offset) {\n    return null;\n  }\n  let coordinate;\n  if (m < flatCoordinates[offset + stride - 1]) {\n    if (extrapolate) {\n      coordinate = flatCoordinates.slice(offset, offset + stride);\n      coordinate[stride - 1] = m;\n      return coordinate;\n    } else {\n      return null;\n    }\n  } else if (flatCoordinates[end - 1] < m) {\n    if (extrapolate) {\n      coordinate = flatCoordinates.slice(end - stride, end);\n      coordinate[stride - 1] = m;\n      return coordinate;\n    } else {\n      return null;\n    }\n  }\n  // FIXME use O(1) search\n  if (m == flatCoordinates[offset + stride - 1]) {\n    return flatCoordinates.slice(offset, offset + stride);\n  }\n  let lo = offset / stride;\n  let hi = end / stride;\n  while (lo < hi) {\n    const mid = (lo + hi) >> 1;\n    if (m < flatCoordinates[(mid + 1) * stride - 1]) {\n      hi = mid;\n    } else {\n      lo = mid + 1;\n    }\n  }\n  const m0 = flatCoordinates[lo * stride - 1];\n  if (m == m0) {\n    return flatCoordinates.slice((lo - 1) * stride, (lo - 1) * stride + stride);\n  }\n  const m1 = flatCoordinates[(lo + 1) * stride - 1];\n  const t = (m - m0) / (m1 - m0);\n  coordinate = [];\n  for (let i = 0; i < stride - 1; ++i) {\n    coordinate.push(lerp(flatCoordinates[(lo - 1) * stride + i],\n      flatCoordinates[lo * stride + i], t));\n  }\n  coordinate.push(m);\n  return coordinate;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {number} m M.\n * @param {boolean} extrapolate Extrapolate.\n * @param {boolean} interpolate Interpolate.\n * @return {module:ol/coordinate~Coordinate} Coordinate.\n */\nexport function lineStringsCoordinateAtM(\n  flatCoordinates, offset, ends, stride, m, extrapolate, interpolate) {\n  if (interpolate) {\n    return lineStringCoordinateAtM(\n      flatCoordinates, offset, ends[ends.length - 1], stride, m, extrapolate);\n  }\n  let coordinate;\n  if (m < flatCoordinates[stride - 1]) {\n    if (extrapolate) {\n      coordinate = flatCoordinates.slice(0, stride);\n      coordinate[stride - 1] = m;\n      return coordinate;\n    } else {\n      return null;\n    }\n  }\n  if (flatCoordinates[flatCoordinates.length - 1] < m) {\n    if (extrapolate) {\n      coordinate = flatCoordinates.slice(flatCoordinates.length - stride);\n      coordinate[stride - 1] = m;\n      return coordinate;\n    } else {\n      return null;\n    }\n  }\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    if (offset == end) {\n      continue;\n    }\n    if (m < flatCoordinates[offset + stride - 1]) {\n      return null;\n    } else if (m <= flatCoordinates[end - 1]) {\n      return lineStringCoordinateAtM(\n        flatCoordinates, offset, end, stride, m, false);\n    }\n    offset = end;\n  }\n  return null;\n}\n","function stringify (obj, options) {\n  options = options || {}\n  var indent = JSON.stringify([1], null, get(options, 'indent', 2)).slice(2, -3)\n  var addMargin = get(options, 'margins', false)\n  var maxLength = (indent === '' ? Infinity : get(options, 'maxLength', 80))\n\n  return (function _stringify (obj, currentIndent, reserved) {\n    if (obj && typeof obj.toJSON === 'function') {\n      obj = obj.toJSON()\n    }\n\n    var string = JSON.stringify(obj)\n\n    if (string === undefined) {\n      return string\n    }\n\n    var length = maxLength - currentIndent.length - reserved\n\n    if (string.length <= length) {\n      var prettified = prettify(string, addMargin)\n      if (prettified.length <= length) {\n        return prettified\n      }\n    }\n\n    if (typeof obj === 'object' && obj !== null) {\n      var nextIndent = currentIndent + indent\n      var items = []\n      var delimiters\n      var comma = function (array, index) {\n        return (index === array.length - 1 ? 0 : 1)\n      }\n\n      if (Array.isArray(obj)) {\n        for (var index = 0; index < obj.length; index++) {\n          items.push(\n            _stringify(obj[index], nextIndent, comma(obj, index)) || 'null'\n          )\n        }\n        delimiters = '[]'\n      } else {\n        Object.keys(obj).forEach(function (key, index, array) {\n          var keyPart = JSON.stringify(key) + ': '\n          var value = _stringify(obj[key], nextIndent,\n                                 keyPart.length + comma(array, index))\n          if (value !== undefined) {\n            items.push(keyPart + value)\n          }\n        })\n        delimiters = '{}'\n      }\n\n      if (items.length > 0) {\n        return [\n          delimiters[0],\n          indent + items.join(',\\n' + nextIndent),\n          delimiters[1]\n        ].join('\\n' + currentIndent)\n      }\n    }\n\n    return string\n  }(obj, '', 0))\n}\n\n// Note: This regex matches even invalid JSON strings, but since we’re\n// working on the output of `JSON.stringify` we know that only valid strings\n// are present (unless the user supplied a weird `options.indent` but in\n// that case we don’t care since the output would be invalid anyway).\nvar stringOrChar = /(\"(?:[^\\\\\"]|\\\\.)*\")|[:,\\][}{]/g\n\nfunction prettify (string, addMargin) {\n  var m = addMargin ? ' ' : ''\n  var tokens = {\n    '{': '{' + m,\n    '[': '[' + m,\n    '}': m + '}',\n    ']': m + ']',\n    ',': ', ',\n    ':': ': '\n  }\n  return string.replace(stringOrChar, function (match, string) {\n    return string ? match : tokens[match]\n  })\n}\n\nfunction get (options, name, defaultValue) {\n  return (name in options ? options[name] : defaultValue)\n}\n\nmodule.exports = stringify\n","\nimport reference from './reference/latest.js';\nimport stringifyPretty from 'json-stringify-pretty-compact';\n\nfunction sortKeysBy(obj, reference) {\n    const result = {};\n    for (const key in reference) {\n        if (obj[key] !== undefined) {\n            result[key] = obj[key];\n        }\n    }\n    for (const key in obj) {\n        if (result[key] === undefined) {\n            result[key] = obj[key];\n        }\n    }\n    return result;\n}\n\n/**\n * Format a Mapbox GL Style.  Returns a stringified style with its keys\n * sorted in the same order as the reference style.\n *\n * The optional `space` argument is passed to\n * [`JSON.stringify`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/JSON/stringify)\n * to generate formatted output.\n *\n * If `space` is unspecified, a default of `2` spaces will be used.\n *\n * @private\n * @param {Object} style a Mapbox GL Style\n * @param {number} [space] space argument to pass to `JSON.stringify`\n * @returns {string} stringified formatted JSON\n * @example\n * var fs = require('fs');\n * var format = require('mapbox-gl-style-spec').format;\n * var style = fs.readFileSync('./source.json', 'utf8');\n * fs.writeFileSync('./dest.json', format(style));\n * fs.writeFileSync('./dest.min.json', format(style, 0));\n */\nfunction format(style, space = 2) {\n    style = sortKeysBy(style, reference.$root);\n\n    if (style.layers) {\n        style.layers = style.layers.map((layer) => sortKeysBy(layer, reference.layer));\n    }\n\n    return stringifyPretty(style, {indent: space});\n}\n\nexport default format;\n","/*! https://mths.be/punycode v1.3.2 by @mathias */\n;(function(root) {\n\n\t/** Detect free variables */\n\tvar freeExports = typeof exports == 'object' && exports &&\n\t\t!exports.nodeType && exports;\n\tvar freeModule = typeof module == 'object' && module &&\n\t\t!module.nodeType && module;\n\tvar freeGlobal = typeof global == 'object' && global;\n\tif (\n\t\tfreeGlobal.global === freeGlobal ||\n\t\tfreeGlobal.window === freeGlobal ||\n\t\tfreeGlobal.self === freeGlobal\n\t) {\n\t\troot = freeGlobal;\n\t}\n\n\t/**\n\t * The `punycode` object.\n\t * @name punycode\n\t * @type Object\n\t */\n\tvar punycode,\n\n\t/** Highest positive signed 32-bit float value */\n\tmaxInt = 2147483647, // aka. 0x7FFFFFFF or 2^31-1\n\n\t/** Bootstring parameters */\n\tbase = 36,\n\ttMin = 1,\n\ttMax = 26,\n\tskew = 38,\n\tdamp = 700,\n\tinitialBias = 72,\n\tinitialN = 128, // 0x80\n\tdelimiter = '-', // '\\x2D'\n\n\t/** Regular expressions */\n\tregexPunycode = /^xn--/,\n\tregexNonASCII = /[^\\x20-\\x7E]/, // unprintable ASCII chars + non-ASCII chars\n\tregexSeparators = /[\\x2E\\u3002\\uFF0E\\uFF61]/g, // RFC 3490 separators\n\n\t/** Error messages */\n\terrors = {\n\t\t'overflow': 'Overflow: input needs wider integers to process',\n\t\t'not-basic': 'Illegal input >= 0x80 (not a basic code point)',\n\t\t'invalid-input': 'Invalid input'\n\t},\n\n\t/** Convenience shortcuts */\n\tbaseMinusTMin = base - tMin,\n\tfloor = Math.floor,\n\tstringFromCharCode = String.fromCharCode,\n\n\t/** Temporary variable */\n\tkey;\n\n\t/*--------------------------------------------------------------------------*/\n\n\t/**\n\t * A generic error utility function.\n\t * @private\n\t * @param {String} type The error type.\n\t * @returns {Error} Throws a `RangeError` with the applicable error message.\n\t */\n\tfunction error(type) {\n\t\tthrow RangeError(errors[type]);\n\t}\n\n\t/**\n\t * A generic `Array#map` utility function.\n\t * @private\n\t * @param {Array} array The array to iterate over.\n\t * @param {Function} callback The function that gets called for every array\n\t * item.\n\t * @returns {Array} A new array of values returned by the callback function.\n\t */\n\tfunction map(array, fn) {\n\t\tvar length = array.length;\n\t\tvar result = [];\n\t\twhile (length--) {\n\t\t\tresult[length] = fn(array[length]);\n\t\t}\n\t\treturn result;\n\t}\n\n\t/**\n\t * A simple `Array#map`-like wrapper to work with domain name strings or email\n\t * addresses.\n\t * @private\n\t * @param {String} domain The domain name or email address.\n\t * @param {Function} callback The function that gets called for every\n\t * character.\n\t * @returns {Array} A new string of characters returned by the callback\n\t * function.\n\t */\n\tfunction mapDomain(string, fn) {\n\t\tvar parts = string.split('@');\n\t\tvar result = '';\n\t\tif (parts.length > 1) {\n\t\t\t// In email addresses, only the domain name should be punycoded. Leave\n\t\t\t// the local part (i.e. everything up to `@`) intact.\n\t\t\tresult = parts[0] + '@';\n\t\t\tstring = parts[1];\n\t\t}\n\t\t// Avoid `split(regex)` for IE8 compatibility. See #17.\n\t\tstring = string.replace(regexSeparators, '\\x2E');\n\t\tvar labels = string.split('.');\n\t\tvar encoded = map(labels, fn).join('.');\n\t\treturn result + encoded;\n\t}\n\n\t/**\n\t * Creates an array containing the numeric code points of each Unicode\n\t * character in the string. While JavaScript uses UCS-2 internally,\n\t * this function will convert a pair of surrogate halves (each of which\n\t * UCS-2 exposes as separate characters) into a single code point,\n\t * matching UTF-16.\n\t * @see `punycode.ucs2.encode`\n\t * @see <https://mathiasbynens.be/notes/javascript-encoding>\n\t * @memberOf punycode.ucs2\n\t * @name decode\n\t * @param {String} string The Unicode input string (UCS-2).\n\t * @returns {Array} The new array of code points.\n\t */\n\tfunction ucs2decode(string) {\n\t\tvar output = [],\n\t\t    counter = 0,\n\t\t    length = string.length,\n\t\t    value,\n\t\t    extra;\n\t\twhile (counter < length) {\n\t\t\tvalue = string.charCodeAt(counter++);\n\t\t\tif (value >= 0xD800 && value <= 0xDBFF && counter < length) {\n\t\t\t\t// high surrogate, and there is a next character\n\t\t\t\textra = string.charCodeAt(counter++);\n\t\t\t\tif ((extra & 0xFC00) == 0xDC00) { // low surrogate\n\t\t\t\t\toutput.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);\n\t\t\t\t} else {\n\t\t\t\t\t// unmatched surrogate; only append this code unit, in case the next\n\t\t\t\t\t// code unit is the high surrogate of a surrogate pair\n\t\t\t\t\toutput.push(value);\n\t\t\t\t\tcounter--;\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\toutput.push(value);\n\t\t\t}\n\t\t}\n\t\treturn output;\n\t}\n\n\t/**\n\t * Creates a string based on an array of numeric code points.\n\t * @see `punycode.ucs2.decode`\n\t * @memberOf punycode.ucs2\n\t * @name encode\n\t * @param {Array} codePoints The array of numeric code points.\n\t * @returns {String} The new Unicode string (UCS-2).\n\t */\n\tfunction ucs2encode(array) {\n\t\treturn map(array, function(value) {\n\t\t\tvar output = '';\n\t\t\tif (value > 0xFFFF) {\n\t\t\t\tvalue -= 0x10000;\n\t\t\t\toutput += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);\n\t\t\t\tvalue = 0xDC00 | value & 0x3FF;\n\t\t\t}\n\t\t\toutput += stringFromCharCode(value);\n\t\t\treturn output;\n\t\t}).join('');\n\t}\n\n\t/**\n\t * Converts a basic code point into a digit/integer.\n\t * @see `digitToBasic()`\n\t * @private\n\t * @param {Number} codePoint The basic numeric code point value.\n\t * @returns {Number} The numeric value of a basic code point (for use in\n\t * representing integers) in the range `0` to `base - 1`, or `base` if\n\t * the code point does not represent a value.\n\t */\n\tfunction basicToDigit(codePoint) {\n\t\tif (codePoint - 48 < 10) {\n\t\t\treturn codePoint - 22;\n\t\t}\n\t\tif (codePoint - 65 < 26) {\n\t\t\treturn codePoint - 65;\n\t\t}\n\t\tif (codePoint - 97 < 26) {\n\t\t\treturn codePoint - 97;\n\t\t}\n\t\treturn base;\n\t}\n\n\t/**\n\t * Converts a digit/integer into a basic code point.\n\t * @see `basicToDigit()`\n\t * @private\n\t * @param {Number} digit The numeric value of a basic code point.\n\t * @returns {Number} The basic code point whose value (when used for\n\t * representing integers) is `digit`, which needs to be in the range\n\t * `0` to `base - 1`. If `flag` is non-zero, the uppercase form is\n\t * used; else, the lowercase form is used. The behavior is undefined\n\t * if `flag` is non-zero and `digit` has no uppercase form.\n\t */\n\tfunction digitToBasic(digit, flag) {\n\t\t//  0..25 map to ASCII a..z or A..Z\n\t\t// 26..35 map to ASCII 0..9\n\t\treturn digit + 22 + 75 * (digit < 26) - ((flag != 0) << 5);\n\t}\n\n\t/**\n\t * Bias adaptation function as per section 3.4 of RFC 3492.\n\t * http://tools.ietf.org/html/rfc3492#section-3.4\n\t * @private\n\t */\n\tfunction adapt(delta, numPoints, firstTime) {\n\t\tvar k = 0;\n\t\tdelta = firstTime ? floor(delta / damp) : delta >> 1;\n\t\tdelta += floor(delta / numPoints);\n\t\tfor (/* no initialization */; delta > baseMinusTMin * tMax >> 1; k += base) {\n\t\t\tdelta = floor(delta / baseMinusTMin);\n\t\t}\n\t\treturn floor(k + (baseMinusTMin + 1) * delta / (delta + skew));\n\t}\n\n\t/**\n\t * Converts a Punycode string of ASCII-only symbols to a string of Unicode\n\t * symbols.\n\t * @memberOf punycode\n\t * @param {String} input The Punycode string of ASCII-only symbols.\n\t * @returns {String} The resulting string of Unicode symbols.\n\t */\n\tfunction decode(input) {\n\t\t// Don't use UCS-2\n\t\tvar output = [],\n\t\t    inputLength = input.length,\n\t\t    out,\n\t\t    i = 0,\n\t\t    n = initialN,\n\t\t    bias = initialBias,\n\t\t    basic,\n\t\t    j,\n\t\t    index,\n\t\t    oldi,\n\t\t    w,\n\t\t    k,\n\t\t    digit,\n\t\t    t,\n\t\t    /** Cached calculation results */\n\t\t    baseMinusT;\n\n\t\t// Handle the basic code points: let `basic` be the number of input code\n\t\t// points before the last delimiter, or `0` if there is none, then copy\n\t\t// the first basic code points to the output.\n\n\t\tbasic = input.lastIndexOf(delimiter);\n\t\tif (basic < 0) {\n\t\t\tbasic = 0;\n\t\t}\n\n\t\tfor (j = 0; j < basic; ++j) {\n\t\t\t// if it's not a basic code point\n\t\t\tif (input.charCodeAt(j) >= 0x80) {\n\t\t\t\terror('not-basic');\n\t\t\t}\n\t\t\toutput.push(input.charCodeAt(j));\n\t\t}\n\n\t\t// Main decoding loop: start just after the last delimiter if any basic code\n\t\t// points were copied; start at the beginning otherwise.\n\n\t\tfor (index = basic > 0 ? basic + 1 : 0; index < inputLength; /* no final expression */) {\n\n\t\t\t// `index` is the index of the next character to be consumed.\n\t\t\t// Decode a generalized variable-length integer into `delta`,\n\t\t\t// which gets added to `i`. The overflow checking is easier\n\t\t\t// if we increase `i` as we go, then subtract off its starting\n\t\t\t// value at the end to obtain `delta`.\n\t\t\tfor (oldi = i, w = 1, k = base; /* no condition */; k += base) {\n\n\t\t\t\tif (index >= inputLength) {\n\t\t\t\t\terror('invalid-input');\n\t\t\t\t}\n\n\t\t\t\tdigit = basicToDigit(input.charCodeAt(index++));\n\n\t\t\t\tif (digit >= base || digit > floor((maxInt - i) / w)) {\n\t\t\t\t\terror('overflow');\n\t\t\t\t}\n\n\t\t\t\ti += digit * w;\n\t\t\t\tt = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);\n\n\t\t\t\tif (digit < t) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\n\t\t\t\tbaseMinusT = base - t;\n\t\t\t\tif (w > floor(maxInt / baseMinusT)) {\n\t\t\t\t\terror('overflow');\n\t\t\t\t}\n\n\t\t\t\tw *= baseMinusT;\n\n\t\t\t}\n\n\t\t\tout = output.length + 1;\n\t\t\tbias = adapt(i - oldi, out, oldi == 0);\n\n\t\t\t// `i` was supposed to wrap around from `out` to `0`,\n\t\t\t// incrementing `n` each time, so we'll fix that now:\n\t\t\tif (floor(i / out) > maxInt - n) {\n\t\t\t\terror('overflow');\n\t\t\t}\n\n\t\t\tn += floor(i / out);\n\t\t\ti %= out;\n\n\t\t\t// Insert `n` at position `i` of the output\n\t\t\toutput.splice(i++, 0, n);\n\n\t\t}\n\n\t\treturn ucs2encode(output);\n\t}\n\n\t/**\n\t * Converts a string of Unicode symbols (e.g. a domain name label) to a\n\t * Punycode string of ASCII-only symbols.\n\t * @memberOf punycode\n\t * @param {String} input The string of Unicode symbols.\n\t * @returns {String} The resulting Punycode string of ASCII-only symbols.\n\t */\n\tfunction encode(input) {\n\t\tvar n,\n\t\t    delta,\n\t\t    handledCPCount,\n\t\t    basicLength,\n\t\t    bias,\n\t\t    j,\n\t\t    m,\n\t\t    q,\n\t\t    k,\n\t\t    t,\n\t\t    currentValue,\n\t\t    output = [],\n\t\t    /** `inputLength` will hold the number of code points in `input`. */\n\t\t    inputLength,\n\t\t    /** Cached calculation results */\n\t\t    handledCPCountPlusOne,\n\t\t    baseMinusT,\n\t\t    qMinusT;\n\n\t\t// Convert the input in UCS-2 to Unicode\n\t\tinput = ucs2decode(input);\n\n\t\t// Cache the length\n\t\tinputLength = input.length;\n\n\t\t// Initialize the state\n\t\tn = initialN;\n\t\tdelta = 0;\n\t\tbias = initialBias;\n\n\t\t// Handle the basic code points\n\t\tfor (j = 0; j < inputLength; ++j) {\n\t\t\tcurrentValue = input[j];\n\t\t\tif (currentValue < 0x80) {\n\t\t\t\toutput.push(stringFromCharCode(currentValue));\n\t\t\t}\n\t\t}\n\n\t\thandledCPCount = basicLength = output.length;\n\n\t\t// `handledCPCount` is the number of code points that have been handled;\n\t\t// `basicLength` is the number of basic code points.\n\n\t\t// Finish the basic string - if it is not empty - with a delimiter\n\t\tif (basicLength) {\n\t\t\toutput.push(delimiter);\n\t\t}\n\n\t\t// Main encoding loop:\n\t\twhile (handledCPCount < inputLength) {\n\n\t\t\t// All non-basic code points < n have been handled already. Find the next\n\t\t\t// larger one:\n\t\t\tfor (m = maxInt, j = 0; j < inputLength; ++j) {\n\t\t\t\tcurrentValue = input[j];\n\t\t\t\tif (currentValue >= n && currentValue < m) {\n\t\t\t\t\tm = currentValue;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Increase `delta` enough to advance the decoder's <n,i> state to <m,0>,\n\t\t\t// but guard against overflow\n\t\t\thandledCPCountPlusOne = handledCPCount + 1;\n\t\t\tif (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {\n\t\t\t\terror('overflow');\n\t\t\t}\n\n\t\t\tdelta += (m - n) * handledCPCountPlusOne;\n\t\t\tn = m;\n\n\t\t\tfor (j = 0; j < inputLength; ++j) {\n\t\t\t\tcurrentValue = input[j];\n\n\t\t\t\tif (currentValue < n && ++delta > maxInt) {\n\t\t\t\t\terror('overflow');\n\t\t\t\t}\n\n\t\t\t\tif (currentValue == n) {\n\t\t\t\t\t// Represent delta as a generalized variable-length integer\n\t\t\t\t\tfor (q = delta, k = base; /* no condition */; k += base) {\n\t\t\t\t\t\tt = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);\n\t\t\t\t\t\tif (q < t) {\n\t\t\t\t\t\t\tbreak;\n\t\t\t\t\t\t}\n\t\t\t\t\t\tqMinusT = q - t;\n\t\t\t\t\t\tbaseMinusT = base - t;\n\t\t\t\t\t\toutput.push(\n\t\t\t\t\t\t\tstringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))\n\t\t\t\t\t\t);\n\t\t\t\t\t\tq = floor(qMinusT / baseMinusT);\n\t\t\t\t\t}\n\n\t\t\t\t\toutput.push(stringFromCharCode(digitToBasic(q, 0)));\n\t\t\t\t\tbias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);\n\t\t\t\t\tdelta = 0;\n\t\t\t\t\t++handledCPCount;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t++delta;\n\t\t\t++n;\n\n\t\t}\n\t\treturn output.join('');\n\t}\n\n\t/**\n\t * Converts a Punycode string representing a domain name or an email address\n\t * to Unicode. Only the Punycoded parts of the input will be converted, i.e.\n\t * it doesn't matter if you call it on a string that has already been\n\t * converted to Unicode.\n\t * @memberOf punycode\n\t * @param {String} input The Punycoded domain name or email address to\n\t * convert to Unicode.\n\t * @returns {String} The Unicode representation of the given Punycode\n\t * string.\n\t */\n\tfunction toUnicode(input) {\n\t\treturn mapDomain(input, function(string) {\n\t\t\treturn regexPunycode.test(string)\n\t\t\t\t? decode(string.slice(4).toLowerCase())\n\t\t\t\t: string;\n\t\t});\n\t}\n\n\t/**\n\t * Converts a Unicode string representing a domain name or an email address to\n\t * Punycode. Only the non-ASCII parts of the domain name will be converted,\n\t * i.e. it doesn't matter if you call it with a domain that's already in\n\t * ASCII.\n\t * @memberOf punycode\n\t * @param {String} input The domain name or email address to convert, as a\n\t * Unicode string.\n\t * @returns {String} The Punycode representation of the given domain name or\n\t * email address.\n\t */\n\tfunction toASCII(input) {\n\t\treturn mapDomain(input, function(string) {\n\t\t\treturn regexNonASCII.test(string)\n\t\t\t\t? 'xn--' + encode(string)\n\t\t\t\t: string;\n\t\t});\n\t}\n\n\t/*--------------------------------------------------------------------------*/\n\n\t/** Define the public API */\n\tpunycode = {\n\t\t/**\n\t\t * A string representing the current Punycode.js version number.\n\t\t * @memberOf punycode\n\t\t * @type String\n\t\t */\n\t\t'version': '1.3.2',\n\t\t/**\n\t\t * An object of methods to convert from JavaScript's internal character\n\t\t * representation (UCS-2) to Unicode code points, and back.\n\t\t * @see <https://mathiasbynens.be/notes/javascript-encoding>\n\t\t * @memberOf punycode\n\t\t * @type Object\n\t\t */\n\t\t'ucs2': {\n\t\t\t'decode': ucs2decode,\n\t\t\t'encode': ucs2encode\n\t\t},\n\t\t'decode': decode,\n\t\t'encode': encode,\n\t\t'toASCII': toASCII,\n\t\t'toUnicode': toUnicode\n\t};\n\n\t/** Expose `punycode` */\n\t// Some AMD build optimizers, like r.js, check for specific condition patterns\n\t// like the following:\n\tif (\n\t\ttypeof define == 'function' &&\n\t\ttypeof define.amd == 'object' &&\n\t\tdefine.amd\n\t) {\n\t\tdefine('punycode', function() {\n\t\t\treturn punycode;\n\t\t});\n\t} else if (freeExports && freeModule) {\n\t\tif (module.exports == freeExports) { // in Node.js or RingoJS v0.8.0+\n\t\t\tfreeModule.exports = punycode;\n\t\t} else { // in Narwhal or RingoJS v0.7.0-\n\t\t\tfor (key in punycode) {\n\t\t\t\tpunycode.hasOwnProperty(key) && (freeExports[key] = punycode[key]);\n\t\t\t}\n\t\t}\n\t} else { // in Rhino or a web browser\n\t\troot.punycode = punycode;\n\t}\n\n}(this));\n","'use strict';\n\nmodule.exports = {\n  isString: function(arg) {\n    return typeof(arg) === 'string';\n  },\n  isObject: function(arg) {\n    return typeof(arg) === 'object' && arg !== null;\n  },\n  isNull: function(arg) {\n    return arg === null;\n  },\n  isNullOrUndefined: function(arg) {\n    return arg == null;\n  }\n};\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n'use strict';\n\n// If obj.hasOwnProperty has been overridden, then calling\n// obj.hasOwnProperty(prop) will break.\n// See: https://github.com/joyent/node/issues/1707\nfunction hasOwnProperty(obj, prop) {\n  return Object.prototype.hasOwnProperty.call(obj, prop);\n}\n\nmodule.exports = function(qs, sep, eq, options) {\n  sep = sep || '&';\n  eq = eq || '=';\n  var obj = {};\n\n  if (typeof qs !== 'string' || qs.length === 0) {\n    return obj;\n  }\n\n  var regexp = /\\+/g;\n  qs = qs.split(sep);\n\n  var maxKeys = 1000;\n  if (options && typeof options.maxKeys === 'number') {\n    maxKeys = options.maxKeys;\n  }\n\n  var len = qs.length;\n  // maxKeys <= 0 means that we should not limit keys count\n  if (maxKeys > 0 && len > maxKeys) {\n    len = maxKeys;\n  }\n\n  for (var i = 0; i < len; ++i) {\n    var x = qs[i].replace(regexp, '%20'),\n        idx = x.indexOf(eq),\n        kstr, vstr, k, v;\n\n    if (idx >= 0) {\n      kstr = x.substr(0, idx);\n      vstr = x.substr(idx + 1);\n    } else {\n      kstr = x;\n      vstr = '';\n    }\n\n    k = decodeURIComponent(kstr);\n    v = decodeURIComponent(vstr);\n\n    if (!hasOwnProperty(obj, k)) {\n      obj[k] = v;\n    } else if (Array.isArray(obj[k])) {\n      obj[k].push(v);\n    } else {\n      obj[k] = [obj[k], v];\n    }\n  }\n\n  return obj;\n};\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n'use strict';\n\nvar stringifyPrimitive = function(v) {\n  switch (typeof v) {\n    case 'string':\n      return v;\n\n    case 'boolean':\n      return v ? 'true' : 'false';\n\n    case 'number':\n      return isFinite(v) ? v : '';\n\n    default:\n      return '';\n  }\n};\n\nmodule.exports = function(obj, sep, eq, name) {\n  sep = sep || '&';\n  eq = eq || '=';\n  if (obj === null) {\n    obj = undefined;\n  }\n\n  if (typeof obj === 'object') {\n    return Object.keys(obj).map(function(k) {\n      var ks = encodeURIComponent(stringifyPrimitive(k)) + eq;\n      if (Array.isArray(obj[k])) {\n        return obj[k].map(function(v) {\n          return ks + encodeURIComponent(stringifyPrimitive(v));\n        }).join(sep);\n      } else {\n        return ks + encodeURIComponent(stringifyPrimitive(obj[k]));\n      }\n    }).join(sep);\n\n  }\n\n  if (!name) return '';\n  return encodeURIComponent(stringifyPrimitive(name)) + eq +\n         encodeURIComponent(stringifyPrimitive(obj));\n};\n","'use strict';\n\nexports.decode = exports.parse = require('./decode');\nexports.encode = exports.stringify = require('./encode');\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n'use strict';\n\nvar punycode = require('punycode');\nvar util = require('./util');\n\nexports.parse = urlParse;\nexports.resolve = urlResolve;\nexports.resolveObject = urlResolveObject;\nexports.format = urlFormat;\n\nexports.Url = Url;\n\nfunction Url() {\n  this.protocol = null;\n  this.slashes = null;\n  this.auth = null;\n  this.host = null;\n  this.port = null;\n  this.hostname = null;\n  this.hash = null;\n  this.search = null;\n  this.query = null;\n  this.pathname = null;\n  this.path = null;\n  this.href = null;\n}\n\n// Reference: RFC 3986, RFC 1808, RFC 2396\n\n// define these here so at least they only have to be\n// compiled once on the first module load.\nvar protocolPattern = /^([a-z0-9.+-]+:)/i,\n    portPattern = /:[0-9]*$/,\n\n    // Special case for a simple path URL\n    simplePathPattern = /^(\\/\\/?(?!\\/)[^\\?\\s]*)(\\?[^\\s]*)?$/,\n\n    // RFC 2396: characters reserved for delimiting URLs.\n    // We actually just auto-escape these.\n    delims = ['<', '>', '\"', '`', ' ', '\\r', '\\n', '\\t'],\n\n    // RFC 2396: characters not allowed for various reasons.\n    unwise = ['{', '}', '|', '\\\\', '^', '`'].concat(delims),\n\n    // Allowed by RFCs, but cause of XSS attacks.  Always escape these.\n    autoEscape = ['\\''].concat(unwise),\n    // Characters that are never ever allowed in a hostname.\n    // Note that any invalid chars are also handled, but these\n    // are the ones that are *expected* to be seen, so we fast-path\n    // them.\n    nonHostChars = ['%', '/', '?', ';', '#'].concat(autoEscape),\n    hostEndingChars = ['/', '?', '#'],\n    hostnameMaxLen = 255,\n    hostnamePartPattern = /^[+a-z0-9A-Z_-]{0,63}$/,\n    hostnamePartStart = /^([+a-z0-9A-Z_-]{0,63})(.*)$/,\n    // protocols that can allow \"unsafe\" and \"unwise\" chars.\n    unsafeProtocol = {\n      'javascript': true,\n      'javascript:': true\n    },\n    // protocols that never have a hostname.\n    hostlessProtocol = {\n      'javascript': true,\n      'javascript:': true\n    },\n    // protocols that always contain a // bit.\n    slashedProtocol = {\n      'http': true,\n      'https': true,\n      'ftp': true,\n      'gopher': true,\n      'file': true,\n      'http:': true,\n      'https:': true,\n      'ftp:': true,\n      'gopher:': true,\n      'file:': true\n    },\n    querystring = require('querystring');\n\nfunction urlParse(url, parseQueryString, slashesDenoteHost) {\n  if (url && util.isObject(url) && url instanceof Url) return url;\n\n  var u = new Url;\n  u.parse(url, parseQueryString, slashesDenoteHost);\n  return u;\n}\n\nUrl.prototype.parse = function(url, parseQueryString, slashesDenoteHost) {\n  if (!util.isString(url)) {\n    throw new TypeError(\"Parameter 'url' must be a string, not \" + typeof url);\n  }\n\n  // Copy chrome, IE, opera backslash-handling behavior.\n  // Back slashes before the query string get converted to forward slashes\n  // See: https://code.google.com/p/chromium/issues/detail?id=25916\n  var queryIndex = url.indexOf('?'),\n      splitter =\n          (queryIndex !== -1 && queryIndex < url.indexOf('#')) ? '?' : '#',\n      uSplit = url.split(splitter),\n      slashRegex = /\\\\/g;\n  uSplit[0] = uSplit[0].replace(slashRegex, '/');\n  url = uSplit.join(splitter);\n\n  var rest = url;\n\n  // trim before proceeding.\n  // This is to support parse stuff like \"  http://foo.com  \\n\"\n  rest = rest.trim();\n\n  if (!slashesDenoteHost && url.split('#').length === 1) {\n    // Try fast path regexp\n    var simplePath = simplePathPattern.exec(rest);\n    if (simplePath) {\n      this.path = rest;\n      this.href = rest;\n      this.pathname = simplePath[1];\n      if (simplePath[2]) {\n        this.search = simplePath[2];\n        if (parseQueryString) {\n          this.query = querystring.parse(this.search.substr(1));\n        } else {\n          this.query = this.search.substr(1);\n        }\n      } else if (parseQueryString) {\n        this.search = '';\n        this.query = {};\n      }\n      return this;\n    }\n  }\n\n  var proto = protocolPattern.exec(rest);\n  if (proto) {\n    proto = proto[0];\n    var lowerProto = proto.toLowerCase();\n    this.protocol = lowerProto;\n    rest = rest.substr(proto.length);\n  }\n\n  // figure out if it's got a host\n  // user@server is *always* interpreted as a hostname, and url\n  // resolution will treat //foo/bar as host=foo,path=bar because that's\n  // how the browser resolves relative URLs.\n  if (slashesDenoteHost || proto || rest.match(/^\\/\\/[^@\\/]+@[^@\\/]+/)) {\n    var slashes = rest.substr(0, 2) === '//';\n    if (slashes && !(proto && hostlessProtocol[proto])) {\n      rest = rest.substr(2);\n      this.slashes = true;\n    }\n  }\n\n  if (!hostlessProtocol[proto] &&\n      (slashes || (proto && !slashedProtocol[proto]))) {\n\n    // there's a hostname.\n    // the first instance of /, ?, ;, or # ends the host.\n    //\n    // If there is an @ in the hostname, then non-host chars *are* allowed\n    // to the left of the last @ sign, unless some host-ending character\n    // comes *before* the @-sign.\n    // URLs are obnoxious.\n    //\n    // ex:\n    // http://a@b@c/ => user:a@b host:c\n    // http://a@b?@c => user:a host:c path:/?@c\n\n    // v0.12 TODO(isaacs): This is not quite how Chrome does things.\n    // Review our test case against browsers more comprehensively.\n\n    // find the first instance of any hostEndingChars\n    var hostEnd = -1;\n    for (var i = 0; i < hostEndingChars.length; i++) {\n      var hec = rest.indexOf(hostEndingChars[i]);\n      if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))\n        hostEnd = hec;\n    }\n\n    // at this point, either we have an explicit point where the\n    // auth portion cannot go past, or the last @ char is the decider.\n    var auth, atSign;\n    if (hostEnd === -1) {\n      // atSign can be anywhere.\n      atSign = rest.lastIndexOf('@');\n    } else {\n      // atSign must be in auth portion.\n      // http://a@b/c@d => host:b auth:a path:/c@d\n      atSign = rest.lastIndexOf('@', hostEnd);\n    }\n\n    // Now we have a portion which is definitely the auth.\n    // Pull that off.\n    if (atSign !== -1) {\n      auth = rest.slice(0, atSign);\n      rest = rest.slice(atSign + 1);\n      this.auth = decodeURIComponent(auth);\n    }\n\n    // the host is the remaining to the left of the first non-host char\n    hostEnd = -1;\n    for (var i = 0; i < nonHostChars.length; i++) {\n      var hec = rest.indexOf(nonHostChars[i]);\n      if (hec !== -1 && (hostEnd === -1 || hec < hostEnd))\n        hostEnd = hec;\n    }\n    // if we still have not hit it, then the entire thing is a host.\n    if (hostEnd === -1)\n      hostEnd = rest.length;\n\n    this.host = rest.slice(0, hostEnd);\n    rest = rest.slice(hostEnd);\n\n    // pull out port.\n    this.parseHost();\n\n    // we've indicated that there is a hostname,\n    // so even if it's empty, it has to be present.\n    this.hostname = this.hostname || '';\n\n    // if hostname begins with [ and ends with ]\n    // assume that it's an IPv6 address.\n    var ipv6Hostname = this.hostname[0] === '[' &&\n        this.hostname[this.hostname.length - 1] === ']';\n\n    // validate a little.\n    if (!ipv6Hostname) {\n      var hostparts = this.hostname.split(/\\./);\n      for (var i = 0, l = hostparts.length; i < l; i++) {\n        var part = hostparts[i];\n        if (!part) continue;\n        if (!part.match(hostnamePartPattern)) {\n          var newpart = '';\n          for (var j = 0, k = part.length; j < k; j++) {\n            if (part.charCodeAt(j) > 127) {\n              // we replace non-ASCII char with a temporary placeholder\n              // we need this to make sure size of hostname is not\n              // broken by replacing non-ASCII by nothing\n              newpart += 'x';\n            } else {\n              newpart += part[j];\n            }\n          }\n          // we test again with ASCII char only\n          if (!newpart.match(hostnamePartPattern)) {\n            var validParts = hostparts.slice(0, i);\n            var notHost = hostparts.slice(i + 1);\n            var bit = part.match(hostnamePartStart);\n            if (bit) {\n              validParts.push(bit[1]);\n              notHost.unshift(bit[2]);\n            }\n            if (notHost.length) {\n              rest = '/' + notHost.join('.') + rest;\n            }\n            this.hostname = validParts.join('.');\n            break;\n          }\n        }\n      }\n    }\n\n    if (this.hostname.length > hostnameMaxLen) {\n      this.hostname = '';\n    } else {\n      // hostnames are always lower case.\n      this.hostname = this.hostname.toLowerCase();\n    }\n\n    if (!ipv6Hostname) {\n      // IDNA Support: Returns a punycoded representation of \"domain\".\n      // It only converts parts of the domain name that\n      // have non-ASCII characters, i.e. it doesn't matter if\n      // you call it with a domain that already is ASCII-only.\n      this.hostname = punycode.toASCII(this.hostname);\n    }\n\n    var p = this.port ? ':' + this.port : '';\n    var h = this.hostname || '';\n    this.host = h + p;\n    this.href += this.host;\n\n    // strip [ and ] from the hostname\n    // the host field still retains them, though\n    if (ipv6Hostname) {\n      this.hostname = this.hostname.substr(1, this.hostname.length - 2);\n      if (rest[0] !== '/') {\n        rest = '/' + rest;\n      }\n    }\n  }\n\n  // now rest is set to the post-host stuff.\n  // chop off any delim chars.\n  if (!unsafeProtocol[lowerProto]) {\n\n    // First, make 100% sure that any \"autoEscape\" chars get\n    // escaped, even if encodeURIComponent doesn't think they\n    // need to be.\n    for (var i = 0, l = autoEscape.length; i < l; i++) {\n      var ae = autoEscape[i];\n      if (rest.indexOf(ae) === -1)\n        continue;\n      var esc = encodeURIComponent(ae);\n      if (esc === ae) {\n        esc = escape(ae);\n      }\n      rest = rest.split(ae).join(esc);\n    }\n  }\n\n\n  // chop off from the tail first.\n  var hash = rest.indexOf('#');\n  if (hash !== -1) {\n    // got a fragment string.\n    this.hash = rest.substr(hash);\n    rest = rest.slice(0, hash);\n  }\n  var qm = rest.indexOf('?');\n  if (qm !== -1) {\n    this.search = rest.substr(qm);\n    this.query = rest.substr(qm + 1);\n    if (parseQueryString) {\n      this.query = querystring.parse(this.query);\n    }\n    rest = rest.slice(0, qm);\n  } else if (parseQueryString) {\n    // no query string, but parseQueryString still requested\n    this.search = '';\n    this.query = {};\n  }\n  if (rest) this.pathname = rest;\n  if (slashedProtocol[lowerProto] &&\n      this.hostname && !this.pathname) {\n    this.pathname = '/';\n  }\n\n  //to support http.request\n  if (this.pathname || this.search) {\n    var p = this.pathname || '';\n    var s = this.search || '';\n    this.path = p + s;\n  }\n\n  // finally, reconstruct the href based on what has been validated.\n  this.href = this.format();\n  return this;\n};\n\n// format a parsed object into a url string\nfunction urlFormat(obj) {\n  // ensure it's an object, and not a string url.\n  // If it's an obj, this is a no-op.\n  // this way, you can call url_format() on strings\n  // to clean up potentially wonky urls.\n  if (util.isString(obj)) obj = urlParse(obj);\n  if (!(obj instanceof Url)) return Url.prototype.format.call(obj);\n  return obj.format();\n}\n\nUrl.prototype.format = function() {\n  var auth = this.auth || '';\n  if (auth) {\n    auth = encodeURIComponent(auth);\n    auth = auth.replace(/%3A/i, ':');\n    auth += '@';\n  }\n\n  var protocol = this.protocol || '',\n      pathname = this.pathname || '',\n      hash = this.hash || '',\n      host = false,\n      query = '';\n\n  if (this.host) {\n    host = auth + this.host;\n  } else if (this.hostname) {\n    host = auth + (this.hostname.indexOf(':') === -1 ?\n        this.hostname :\n        '[' + this.hostname + ']');\n    if (this.port) {\n      host += ':' + this.port;\n    }\n  }\n\n  if (this.query &&\n      util.isObject(this.query) &&\n      Object.keys(this.query).length) {\n    query = querystring.stringify(this.query);\n  }\n\n  var search = this.search || (query && ('?' + query)) || '';\n\n  if (protocol && protocol.substr(-1) !== ':') protocol += ':';\n\n  // only the slashedProtocols get the //.  Not mailto:, xmpp:, etc.\n  // unless they had them to begin with.\n  if (this.slashes ||\n      (!protocol || slashedProtocol[protocol]) && host !== false) {\n    host = '//' + (host || '');\n    if (pathname && pathname.charAt(0) !== '/') pathname = '/' + pathname;\n  } else if (!host) {\n    host = '';\n  }\n\n  if (hash && hash.charAt(0) !== '#') hash = '#' + hash;\n  if (search && search.charAt(0) !== '?') search = '?' + search;\n\n  pathname = pathname.replace(/[?#]/g, function(match) {\n    return encodeURIComponent(match);\n  });\n  search = search.replace('#', '%23');\n\n  return protocol + host + pathname + search + hash;\n};\n\nfunction urlResolve(source, relative) {\n  return urlParse(source, false, true).resolve(relative);\n}\n\nUrl.prototype.resolve = function(relative) {\n  return this.resolveObject(urlParse(relative, false, true)).format();\n};\n\nfunction urlResolveObject(source, relative) {\n  if (!source) return relative;\n  return urlParse(source, false, true).resolveObject(relative);\n}\n\nUrl.prototype.resolveObject = function(relative) {\n  if (util.isString(relative)) {\n    var rel = new Url();\n    rel.parse(relative, false, true);\n    relative = rel;\n  }\n\n  var result = new Url();\n  var tkeys = Object.keys(this);\n  for (var tk = 0; tk < tkeys.length; tk++) {\n    var tkey = tkeys[tk];\n    result[tkey] = this[tkey];\n  }\n\n  // hash is always overridden, no matter what.\n  // even href=\"\" will remove it.\n  result.hash = relative.hash;\n\n  // if the relative url is empty, then there's nothing left to do here.\n  if (relative.href === '') {\n    result.href = result.format();\n    return result;\n  }\n\n  // hrefs like //foo/bar always cut to the protocol.\n  if (relative.slashes && !relative.protocol) {\n    // take everything except the protocol from relative\n    var rkeys = Object.keys(relative);\n    for (var rk = 0; rk < rkeys.length; rk++) {\n      var rkey = rkeys[rk];\n      if (rkey !== 'protocol')\n        result[rkey] = relative[rkey];\n    }\n\n    //urlParse appends trailing / to urls like http://www.example.com\n    if (slashedProtocol[result.protocol] &&\n        result.hostname && !result.pathname) {\n      result.path = result.pathname = '/';\n    }\n\n    result.href = result.format();\n    return result;\n  }\n\n  if (relative.protocol && relative.protocol !== result.protocol) {\n    // if it's a known url protocol, then changing\n    // the protocol does weird things\n    // first, if it's not file:, then we MUST have a host,\n    // and if there was a path\n    // to begin with, then we MUST have a path.\n    // if it is file:, then the host is dropped,\n    // because that's known to be hostless.\n    // anything else is assumed to be absolute.\n    if (!slashedProtocol[relative.protocol]) {\n      var keys = Object.keys(relative);\n      for (var v = 0; v < keys.length; v++) {\n        var k = keys[v];\n        result[k] = relative[k];\n      }\n      result.href = result.format();\n      return result;\n    }\n\n    result.protocol = relative.protocol;\n    if (!relative.host && !hostlessProtocol[relative.protocol]) {\n      var relPath = (relative.pathname || '').split('/');\n      while (relPath.length && !(relative.host = relPath.shift()));\n      if (!relative.host) relative.host = '';\n      if (!relative.hostname) relative.hostname = '';\n      if (relPath[0] !== '') relPath.unshift('');\n      if (relPath.length < 2) relPath.unshift('');\n      result.pathname = relPath.join('/');\n    } else {\n      result.pathname = relative.pathname;\n    }\n    result.search = relative.search;\n    result.query = relative.query;\n    result.host = relative.host || '';\n    result.auth = relative.auth;\n    result.hostname = relative.hostname || relative.host;\n    result.port = relative.port;\n    // to support http.request\n    if (result.pathname || result.search) {\n      var p = result.pathname || '';\n      var s = result.search || '';\n      result.path = p + s;\n    }\n    result.slashes = result.slashes || relative.slashes;\n    result.href = result.format();\n    return result;\n  }\n\n  var isSourceAbs = (result.pathname && result.pathname.charAt(0) === '/'),\n      isRelAbs = (\n          relative.host ||\n          relative.pathname && relative.pathname.charAt(0) === '/'\n      ),\n      mustEndAbs = (isRelAbs || isSourceAbs ||\n                    (result.host && relative.pathname)),\n      removeAllDots = mustEndAbs,\n      srcPath = result.pathname && result.pathname.split('/') || [],\n      relPath = relative.pathname && relative.pathname.split('/') || [],\n      psychotic = result.protocol && !slashedProtocol[result.protocol];\n\n  // if the url is a non-slashed url, then relative\n  // links like ../.. should be able\n  // to crawl up to the hostname, as well.  This is strange.\n  // result.protocol has already been set by now.\n  // Later on, put the first path part into the host field.\n  if (psychotic) {\n    result.hostname = '';\n    result.port = null;\n    if (result.host) {\n      if (srcPath[0] === '') srcPath[0] = result.host;\n      else srcPath.unshift(result.host);\n    }\n    result.host = '';\n    if (relative.protocol) {\n      relative.hostname = null;\n      relative.port = null;\n      if (relative.host) {\n        if (relPath[0] === '') relPath[0] = relative.host;\n        else relPath.unshift(relative.host);\n      }\n      relative.host = null;\n    }\n    mustEndAbs = mustEndAbs && (relPath[0] === '' || srcPath[0] === '');\n  }\n\n  if (isRelAbs) {\n    // it's absolute.\n    result.host = (relative.host || relative.host === '') ?\n                  relative.host : result.host;\n    result.hostname = (relative.hostname || relative.hostname === '') ?\n                      relative.hostname : result.hostname;\n    result.search = relative.search;\n    result.query = relative.query;\n    srcPath = relPath;\n    // fall through to the dot-handling below.\n  } else if (relPath.length) {\n    // it's relative\n    // throw away the existing file, and take the new path instead.\n    if (!srcPath) srcPath = [];\n    srcPath.pop();\n    srcPath = srcPath.concat(relPath);\n    result.search = relative.search;\n    result.query = relative.query;\n  } else if (!util.isNullOrUndefined(relative.search)) {\n    // just pull out the search.\n    // like href='?foo'.\n    // Put this after the other two cases because it simplifies the booleans\n    if (psychotic) {\n      result.hostname = result.host = srcPath.shift();\n      //occationaly the auth can get stuck only in host\n      //this especially happens in cases like\n      //url.resolveObject('mailto:local1@domain1', 'local2@domain2')\n      var authInHost = result.host && result.host.indexOf('@') > 0 ?\n                       result.host.split('@') : false;\n      if (authInHost) {\n        result.auth = authInHost.shift();\n        result.host = result.hostname = authInHost.shift();\n      }\n    }\n    result.search = relative.search;\n    result.query = relative.query;\n    //to support http.request\n    if (!util.isNull(result.pathname) || !util.isNull(result.search)) {\n      result.path = (result.pathname ? result.pathname : '') +\n                    (result.search ? result.search : '');\n    }\n    result.href = result.format();\n    return result;\n  }\n\n  if (!srcPath.length) {\n    // no path at all.  easy.\n    // we've already handled the other stuff above.\n    result.pathname = null;\n    //to support http.request\n    if (result.search) {\n      result.path = '/' + result.search;\n    } else {\n      result.path = null;\n    }\n    result.href = result.format();\n    return result;\n  }\n\n  // if a url ENDs in . or .., then it must get a trailing slash.\n  // however, if it ends in anything else non-slashy,\n  // then it must NOT get a trailing slash.\n  var last = srcPath.slice(-1)[0];\n  var hasTrailingSlash = (\n      (result.host || relative.host || srcPath.length > 1) &&\n      (last === '.' || last === '..') || last === '');\n\n  // strip single dots, resolve double dots to parent dir\n  // if the path tries to go above the root, `up` ends up > 0\n  var up = 0;\n  for (var i = srcPath.length; i >= 0; i--) {\n    last = srcPath[i];\n    if (last === '.') {\n      srcPath.splice(i, 1);\n    } else if (last === '..') {\n      srcPath.splice(i, 1);\n      up++;\n    } else if (up) {\n      srcPath.splice(i, 1);\n      up--;\n    }\n  }\n\n  // if the path is allowed to go above the root, restore leading ..s\n  if (!mustEndAbs && !removeAllDots) {\n    for (; up--; up) {\n      srcPath.unshift('..');\n    }\n  }\n\n  if (mustEndAbs && srcPath[0] !== '' &&\n      (!srcPath[0] || srcPath[0].charAt(0) !== '/')) {\n    srcPath.unshift('');\n  }\n\n  if (hasTrailingSlash && (srcPath.join('/').substr(-1) !== '/')) {\n    srcPath.push('');\n  }\n\n  var isAbsolute = srcPath[0] === '' ||\n      (srcPath[0] && srcPath[0].charAt(0) === '/');\n\n  // put the host back\n  if (psychotic) {\n    result.hostname = result.host = isAbsolute ? '' :\n                                    srcPath.length ? srcPath.shift() : '';\n    //occationaly the auth can get stuck only in host\n    //this especially happens in cases like\n    //url.resolveObject('mailto:local1@domain1', 'local2@domain2')\n    var authInHost = result.host && result.host.indexOf('@') > 0 ?\n                     result.host.split('@') : false;\n    if (authInHost) {\n      result.auth = authInHost.shift();\n      result.host = result.hostname = authInHost.shift();\n    }\n  }\n\n  mustEndAbs = mustEndAbs || (result.host && srcPath.length);\n\n  if (mustEndAbs && !isAbsolute) {\n    srcPath.unshift('');\n  }\n\n  if (!srcPath.length) {\n    result.pathname = null;\n    result.path = null;\n  } else {\n    result.pathname = srcPath.join('/');\n  }\n\n  //to support request.http\n  if (!util.isNull(result.pathname) || !util.isNull(result.search)) {\n    result.path = (result.pathname ? result.pathname : '') +\n                  (result.search ? result.search : '');\n  }\n  result.auth = relative.auth || result.auth;\n  result.slashes = result.slashes || relative.slashes;\n  result.href = result.format();\n  return result;\n};\n\nUrl.prototype.parseHost = function() {\n  var host = this.host;\n  var port = portPattern.exec(host);\n  if (port) {\n    port = port[0];\n    if (port !== ':') {\n      this.port = port.substr(1);\n    }\n    host = host.substr(0, host.length - port.length);\n  }\n  if (host) this.hostname = host;\n};\n","// @flow\n\nimport Reference from './reference/v8.json';\nimport type {StylePropertySpecification} from './style-spec';\nimport type {\n    StyleSpecification,\n    SourceSpecification,\n    LayerSpecification,\n    PropertyValueSpecification,\n    DataDrivenPropertyValueSpecification\n} from './types';\n\nfunction getPropertyReference(propertyName): StylePropertySpecification {\n    for (let i = 0; i < Reference.layout.length; i++) {\n        for (const key in Reference[Reference.layout[i]]) {\n            if (key === propertyName) return (Reference[Reference.layout[i]][key]: any);\n        }\n    }\n    for (let i = 0; i < Reference.paint.length; i++) {\n        for (const key in Reference[Reference.paint[i]]) {\n            if (key === propertyName) return (Reference[Reference.paint[i]][key]: any);\n        }\n    }\n\n    return (null: any);\n}\n\nexport function eachSource(style: StyleSpecification, callback: (SourceSpecification) => void) {\n    for (const k in style.sources) {\n        callback(style.sources[k]);\n    }\n}\n\nexport function eachLayer(style: StyleSpecification, callback: (LayerSpecification) => void) {\n    for (const layer of style.layers) {\n        callback(layer);\n    }\n}\n\ntype PropertyCallback = ({\n    path: [string, 'paint' | 'layout', string], // [layerid, paint/layout, property key]\n    key: string,\n    value: PropertyValueSpecification<mixed> | DataDrivenPropertyValueSpecification<mixed>,\n    reference: StylePropertySpecification,\n    set: (PropertyValueSpecification<mixed> | DataDrivenPropertyValueSpecification<mixed>) => void\n}) => void;\n\nexport function eachProperty(\n    style: StyleSpecification,\n    options: {paint?: boolean, layout?: boolean},\n    callback: PropertyCallback\n) {\n    function inner(layer, propertyType: 'paint' | 'layout') {\n        const properties = (layer[propertyType]: any);\n        if (!properties) return;\n        Object.keys(properties).forEach((key) => {\n            callback({\n                path: [layer.id, propertyType, key],\n                key: key,\n                value: properties[key],\n                reference: getPropertyReference(key),\n                set: function(x) {\n                    properties[key] = x;\n                }\n            });\n        });\n    }\n\n    eachLayer(style, (layer) => {\n        if (options.paint) {\n            inner(layer, 'paint');\n        }\n        if (options.layout) {\n            inner(layer, 'layout');\n        }\n    });\n}\n","\nimport URL from 'url';\nimport {eachSource, eachLayer, eachProperty} from '../visit';\n\nfunction eachLayout(layer, callback) {\n    for (const k in layer) {\n        if (k.indexOf('layout') === 0) {\n            callback(layer[k], k);\n        }\n    }\n}\n\nfunction eachPaint(layer, callback) {\n    for (const k in layer) {\n        if (k.indexOf('paint') === 0) {\n            callback(layer[k], k);\n        }\n    }\n}\n\nfunction resolveConstant(style, value) {\n    if (typeof value === 'string' && value[0] === '@') {\n        return resolveConstant(style, style.constants[value]);\n    } else {\n        return value;\n    }\n}\n\nfunction isFunction(value) {\n    return Array.isArray(value.stops);\n}\n\nfunction renameProperty(obj, from, to) {\n    obj[to] = obj[from]; delete obj[from];\n}\n\nexport default function(style) {\n    style.version = 8;\n\n    // Rename properties, reverse coordinates in source and layers\n    eachSource(style, (source) => {\n        if (source.type === 'video' && source.url !== undefined) {\n            renameProperty(source, 'url', 'urls');\n        }\n        if (source.type === 'video') {\n            source.coordinates.forEach((coord) => {\n                return coord.reverse();\n            });\n        }\n    });\n\n    eachLayer(style, (layer) => {\n        eachLayout(layer, (layout) => {\n            if (layout['symbol-min-distance'] !== undefined) {\n                renameProperty(layout, 'symbol-min-distance', 'symbol-spacing');\n            }\n        });\n\n        eachPaint(layer, (paint) => {\n            if (paint['background-image'] !== undefined) {\n                renameProperty(paint, 'background-image', 'background-pattern');\n            }\n            if (paint['line-image'] !== undefined) {\n                renameProperty(paint, 'line-image', 'line-pattern');\n            }\n            if (paint['fill-image'] !== undefined) {\n                renameProperty(paint, 'fill-image', 'fill-pattern');\n            }\n        });\n    });\n\n    // Inline Constants\n    eachProperty(style, {paint: true, layout: true}, (property) => {\n        const value = resolveConstant(style, property.value);\n\n        if (isFunction(value)) {\n            value.stops.forEach((stop) => {\n                stop[1] = resolveConstant(style, stop[1]);\n            });\n        }\n\n        property.set(value);\n    });\n    delete style.constants;\n\n    eachLayer(style, (layer) => {\n        // get rid of text-max-size, icon-max-size\n        // turn text-size, icon-size into layout properties\n        // https://github.com/mapbox/mapbox-gl-style-spec/issues/255\n\n        eachLayout(layer, (layout) => {\n            delete layout['text-max-size'];\n            delete layout['icon-max-size'];\n        });\n\n        eachPaint(layer, (paint) => {\n            if (paint['text-size']) {\n                if (!layer.layout) layer.layout = {};\n                layer.layout['text-size'] = paint['text-size'];\n                delete paint['text-size'];\n            }\n\n            if (paint['icon-size']) {\n                if (!layer.layout) layer.layout = {};\n                layer.layout['icon-size'] = paint['icon-size'];\n                delete paint['icon-size'];\n            }\n        });\n    });\n\n    function migrateFontstackURL(input) {\n        const inputParsed = URL.parse(input);\n        const inputPathnameParts = inputParsed.pathname.split('/');\n\n        if (inputParsed.protocol !== 'mapbox:') {\n            return input;\n\n        } else if (inputParsed.hostname === 'fontstack') {\n            assert(decodeURI(inputParsed.pathname) === '/{fontstack}/{range}.pbf');\n            return 'mapbox://fonts/mapbox/{fontstack}/{range}.pbf';\n\n        } else if (inputParsed.hostname === 'fonts') {\n            assert(inputPathnameParts[1] === 'v1');\n            assert(decodeURI(inputPathnameParts[3]) === '{fontstack}');\n            assert(decodeURI(inputPathnameParts[4]) === '{range}.pbf');\n            return `mapbox://fonts/${inputPathnameParts[2]}/{fontstack}/{range}.pbf`;\n\n        } else {\n            assert(false);\n        }\n\n        function assert(predicate) {\n            if (!predicate) {\n                throw new Error(`Invalid font url: \"${input}\"`);\n            }\n        }\n    }\n\n    if (style.glyphs) {\n        style.glyphs = migrateFontstackURL(style.glyphs);\n    }\n\n    function migrateFontStack(font) {\n        function splitAndTrim(string) {\n            return string.split(',').map((s) => {\n                return s.trim();\n            });\n        }\n\n        if (Array.isArray(font)) {\n            // Assume it's a previously migrated font-array.\n            return font;\n\n        } else if (typeof font === 'string') {\n            return splitAndTrim(font);\n\n        } else if (typeof font === 'object') {\n            font.stops.forEach((stop) => {\n                stop[1] = splitAndTrim(stop[1]);\n            });\n            return font;\n\n        } else {\n            throw new Error(\"unexpected font value\");\n        }\n    }\n\n    eachLayer(style, (layer) => {\n        eachLayout(layer, (layout) => {\n            if (layout['text-font']) {\n                layout['text-font'] = migrateFontStack(layout['text-font']);\n            }\n        });\n    });\n\n    // Reverse order of symbol layers. This is an imperfect migration.\n    //\n    // The order of a symbol layer in the layers list affects two things:\n    // - how it is drawn relative to other layers (like oneway arrows below bridges)\n    // - the placement priority compared to other layers\n    //\n    // It's impossible to reverse the placement priority without breaking the draw order\n    // in some cases. This migration only reverses the order of symbol layers that\n    // are above all other types of layers.\n    //\n    // Symbol layers that are at the top of the map preserve their priority.\n    // Symbol layers that are below another type (line, fill) of layer preserve their draw order.\n\n    let firstSymbolLayer = 0;\n    for (let i = style.layers.length - 1; i >= 0; i--) {\n        const layer = style.layers[i];\n        if (layer.type !== 'symbol') {\n            firstSymbolLayer = i + 1;\n            break;\n        }\n    }\n\n    const symbolLayers = style.layers.splice(firstSymbolLayer);\n    symbolLayers.reverse();\n    style.layers = style.layers.concat(symbolLayers);\n\n    return style;\n}\n","\nexport default function (output, ...inputs) {\n    for (const input of inputs) {\n        for (const k in input) {\n            output[k] = input[k];\n        }\n    }\n    return output;\n}\n","// @flow\n\nclass ParsingError extends Error {\n    key: string;\n    message: string;\n    constructor(key: string, message: string) {\n        super(message);\n        this.message = message;\n        this.key = key;\n    }\n}\n\nexport default ParsingError;\n","// @flow\n\nimport type {Expression} from './expression';\n\n/**\n * Tracks `let` bindings during expression parsing.\n * @private\n */\nclass Scope {\n    parent: ?Scope;\n    bindings: {[string]: Expression};\n    constructor(parent?: Scope, bindings: Array<[string, Expression]> = []) {\n        this.parent = parent;\n        this.bindings = {};\n        for (const [name, expression] of bindings) {\n            this.bindings[name] = expression;\n        }\n    }\n\n    concat(bindings: Array<[string, Expression]>) {\n        return new Scope(this, bindings);\n    }\n\n    get(name: string): Expression {\n        if (this.bindings[name]) { return this.bindings[name]; }\n        if (this.parent) { return this.parent.get(name); }\n        throw new Error(`${name} not found in scope.`);\n    }\n\n    has(name: string): boolean {\n        if (this.bindings[name]) return true;\n        return this.parent ? this.parent.has(name) : false;\n    }\n}\n\nexport default Scope;\n","// @flow\n\nexport type NullTypeT = { kind: 'null' };\nexport type NumberTypeT = { kind: 'number' };\nexport type StringTypeT = { kind: 'string' };\nexport type BooleanTypeT = { kind: 'boolean' };\nexport type ColorTypeT = { kind: 'color' };\nexport type ObjectTypeT = { kind: 'object' };\nexport type ValueTypeT = { kind: 'value' };\nexport type ErrorTypeT = { kind: 'error' };\nexport type CollatorTypeT = { kind: 'collator' };\nexport type FormattedTypeT = { kind: 'formatted' };\n\nexport type Type =\n    NullTypeT |\n    NumberTypeT |\n    StringTypeT |\n    BooleanTypeT |\n    ColorTypeT |\n    ObjectTypeT |\n    ValueTypeT |\n    ArrayType | // eslint-disable-line no-use-before-define\n    ErrorTypeT |\n    CollatorTypeT |\n    FormattedTypeT\n\nexport type ArrayType = {\n    kind: 'array',\n    itemType: Type,\n    N: ?number\n}\n\nexport const NullType = { kind: 'null' };\nexport const NumberType = { kind: 'number' };\nexport const StringType = { kind: 'string' };\nexport const BooleanType = { kind: 'boolean' };\nexport const ColorType = { kind: 'color' };\nexport const ObjectType = { kind: 'object' };\nexport const ValueType = { kind: 'value' };\nexport const ErrorType = { kind: 'error' };\nexport const CollatorType = { kind: 'collator' };\nexport const FormattedType = { kind: 'formatted' };\n\nexport function array(itemType: Type, N: ?number): ArrayType {\n    return {\n        kind: 'array',\n        itemType,\n        N\n    };\n}\n\nexport function toString(type: Type): string {\n    if (type.kind === 'array') {\n        const itemType = toString(type.itemType);\n        return typeof type.N === 'number' ?\n            `array<${itemType}, ${type.N}>` :\n            type.itemType.kind === 'value' ? 'array' : `array<${itemType}>`;\n    } else {\n        return type.kind;\n    }\n}\n\nconst valueMemberTypes = [\n    NullType,\n    NumberType,\n    StringType,\n    BooleanType,\n    ColorType,\n    FormattedType,\n    ObjectType,\n    array(ValueType)\n];\n\n/**\n * Returns null if `t` is a subtype of `expected`; otherwise returns an\n * error message.\n * @private\n */\nexport function checkSubtype(expected: Type, t: Type): ?string {\n    if (t.kind === 'error') {\n        // Error is a subtype of every type\n        return null;\n    } else if (expected.kind === 'array') {\n        if (t.kind === 'array' &&\n            ((t.N === 0 && t.itemType.kind === 'value') || !checkSubtype(expected.itemType, t.itemType)) &&\n            (typeof expected.N !== 'number' || expected.N === t.N)) {\n            return null;\n        }\n    } else if (expected.kind === t.kind) {\n        return null;\n    } else if (expected.kind === 'value') {\n        for (const memberType of valueMemberTypes) {\n            if (!checkSubtype(memberType, t)) {\n                return null;\n            }\n        }\n    }\n\n    return `Expected ${toString(expected)} but found ${toString(t)} instead.`;\n}\n","// (c) Dean McNamee <dean@gmail.com>, 2012.\n//\n// https://github.com/deanm/css-color-parser-js\n//\n// Permission is hereby granted, free of charge, to any person obtaining a copy\n// of this software and associated documentation files (the \"Software\"), to\n// deal in the Software without restriction, including without limitation the\n// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or\n// sell copies of the Software, and to permit persons to whom the Software is\n// furnished to do so, subject to the following conditions:\n//\n// The above copyright notice and this permission notice shall be included in\n// all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING\n// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS\n// IN THE SOFTWARE.\n\n// http://www.w3.org/TR/css3-color/\nvar kCSSColorTable = {\n  \"transparent\": [0,0,0,0], \"aliceblue\": [240,248,255,1],\n  \"antiquewhite\": [250,235,215,1], \"aqua\": [0,255,255,1],\n  \"aquamarine\": [127,255,212,1], \"azure\": [240,255,255,1],\n  \"beige\": [245,245,220,1], \"bisque\": [255,228,196,1],\n  \"black\": [0,0,0,1], \"blanchedalmond\": [255,235,205,1],\n  \"blue\": [0,0,255,1], \"blueviolet\": [138,43,226,1],\n  \"brown\": [165,42,42,1], \"burlywood\": [222,184,135,1],\n  \"cadetblue\": [95,158,160,1], \"chartreuse\": [127,255,0,1],\n  \"chocolate\": [210,105,30,1], \"coral\": [255,127,80,1],\n  \"cornflowerblue\": [100,149,237,1], \"cornsilk\": [255,248,220,1],\n  \"crimson\": [220,20,60,1], \"cyan\": [0,255,255,1],\n  \"darkblue\": [0,0,139,1], \"darkcyan\": [0,139,139,1],\n  \"darkgoldenrod\": [184,134,11,1], \"darkgray\": [169,169,169,1],\n  \"darkgreen\": [0,100,0,1], \"darkgrey\": [169,169,169,1],\n  \"darkkhaki\": [189,183,107,1], \"darkmagenta\": [139,0,139,1],\n  \"darkolivegreen\": [85,107,47,1], \"darkorange\": [255,140,0,1],\n  \"darkorchid\": [153,50,204,1], \"darkred\": [139,0,0,1],\n  \"darksalmon\": [233,150,122,1], \"darkseagreen\": [143,188,143,1],\n  \"darkslateblue\": [72,61,139,1], \"darkslategray\": [47,79,79,1],\n  \"darkslategrey\": [47,79,79,1], \"darkturquoise\": [0,206,209,1],\n  \"darkviolet\": [148,0,211,1], \"deeppink\": [255,20,147,1],\n  \"deepskyblue\": [0,191,255,1], \"dimgray\": [105,105,105,1],\n  \"dimgrey\": [105,105,105,1], \"dodgerblue\": [30,144,255,1],\n  \"firebrick\": [178,34,34,1], \"floralwhite\": [255,250,240,1],\n  \"forestgreen\": [34,139,34,1], \"fuchsia\": [255,0,255,1],\n  \"gainsboro\": [220,220,220,1], \"ghostwhite\": [248,248,255,1],\n  \"gold\": [255,215,0,1], \"goldenrod\": [218,165,32,1],\n  \"gray\": [128,128,128,1], \"green\": [0,128,0,1],\n  \"greenyellow\": [173,255,47,1], \"grey\": [128,128,128,1],\n  \"honeydew\": [240,255,240,1], \"hotpink\": [255,105,180,1],\n  \"indianred\": [205,92,92,1], \"indigo\": [75,0,130,1],\n  \"ivory\": [255,255,240,1], \"khaki\": [240,230,140,1],\n  \"lavender\": [230,230,250,1], \"lavenderblush\": [255,240,245,1],\n  \"lawngreen\": [124,252,0,1], \"lemonchiffon\": [255,250,205,1],\n  \"lightblue\": [173,216,230,1], \"lightcoral\": [240,128,128,1],\n  \"lightcyan\": [224,255,255,1], \"lightgoldenrodyellow\": [250,250,210,1],\n  \"lightgray\": [211,211,211,1], \"lightgreen\": [144,238,144,1],\n  \"lightgrey\": [211,211,211,1], \"lightpink\": [255,182,193,1],\n  \"lightsalmon\": [255,160,122,1], \"lightseagreen\": [32,178,170,1],\n  \"lightskyblue\": [135,206,250,1], \"lightslategray\": [119,136,153,1],\n  \"lightslategrey\": [119,136,153,1], \"lightsteelblue\": [176,196,222,1],\n  \"lightyellow\": [255,255,224,1], \"lime\": [0,255,0,1],\n  \"limegreen\": [50,205,50,1], \"linen\": [250,240,230,1],\n  \"magenta\": [255,0,255,1], \"maroon\": [128,0,0,1],\n  \"mediumaquamarine\": [102,205,170,1], \"mediumblue\": [0,0,205,1],\n  \"mediumorchid\": [186,85,211,1], \"mediumpurple\": [147,112,219,1],\n  \"mediumseagreen\": [60,179,113,1], \"mediumslateblue\": [123,104,238,1],\n  \"mediumspringgreen\": [0,250,154,1], \"mediumturquoise\": [72,209,204,1],\n  \"mediumvioletred\": [199,21,133,1], \"midnightblue\": [25,25,112,1],\n  \"mintcream\": [245,255,250,1], \"mistyrose\": [255,228,225,1],\n  \"moccasin\": [255,228,181,1], \"navajowhite\": [255,222,173,1],\n  \"navy\": [0,0,128,1], \"oldlace\": [253,245,230,1],\n  \"olive\": [128,128,0,1], \"olivedrab\": [107,142,35,1],\n  \"orange\": [255,165,0,1], \"orangered\": [255,69,0,1],\n  \"orchid\": [218,112,214,1], \"palegoldenrod\": [238,232,170,1],\n  \"palegreen\": [152,251,152,1], \"paleturquoise\": [175,238,238,1],\n  \"palevioletred\": [219,112,147,1], \"papayawhip\": [255,239,213,1],\n  \"peachpuff\": [255,218,185,1], \"peru\": [205,133,63,1],\n  \"pink\": [255,192,203,1], \"plum\": [221,160,221,1],\n  \"powderblue\": [176,224,230,1], \"purple\": [128,0,128,1],\n  \"rebeccapurple\": [102,51,153,1],\n  \"red\": [255,0,0,1], \"rosybrown\": [188,143,143,1],\n  \"royalblue\": [65,105,225,1], \"saddlebrown\": [139,69,19,1],\n  \"salmon\": [250,128,114,1], \"sandybrown\": [244,164,96,1],\n  \"seagreen\": [46,139,87,1], \"seashell\": [255,245,238,1],\n  \"sienna\": [160,82,45,1], \"silver\": [192,192,192,1],\n  \"skyblue\": [135,206,235,1], \"slateblue\": [106,90,205,1],\n  \"slategray\": [112,128,144,1], \"slategrey\": [112,128,144,1],\n  \"snow\": [255,250,250,1], \"springgreen\": [0,255,127,1],\n  \"steelblue\": [70,130,180,1], \"tan\": [210,180,140,1],\n  \"teal\": [0,128,128,1], \"thistle\": [216,191,216,1],\n  \"tomato\": [255,99,71,1], \"turquoise\": [64,224,208,1],\n  \"violet\": [238,130,238,1], \"wheat\": [245,222,179,1],\n  \"white\": [255,255,255,1], \"whitesmoke\": [245,245,245,1],\n  \"yellow\": [255,255,0,1], \"yellowgreen\": [154,205,50,1]}\n\nfunction clamp_css_byte(i) {  // Clamp to integer 0 .. 255.\n  i = Math.round(i);  // Seems to be what Chrome does (vs truncation).\n  return i < 0 ? 0 : i > 255 ? 255 : i;\n}\n\nfunction clamp_css_float(f) {  // Clamp to float 0.0 .. 1.0.\n  return f < 0 ? 0 : f > 1 ? 1 : f;\n}\n\nfunction parse_css_int(str) {  // int or percentage.\n  if (str[str.length - 1] === '%')\n    return clamp_css_byte(parseFloat(str) / 100 * 255);\n  return clamp_css_byte(parseInt(str));\n}\n\nfunction parse_css_float(str) {  // float or percentage.\n  if (str[str.length - 1] === '%')\n    return clamp_css_float(parseFloat(str) / 100);\n  return clamp_css_float(parseFloat(str));\n}\n\nfunction css_hue_to_rgb(m1, m2, h) {\n  if (h < 0) h += 1;\n  else if (h > 1) h -= 1;\n\n  if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;\n  if (h * 2 < 1) return m2;\n  if (h * 3 < 2) return m1 + (m2 - m1) * (2/3 - h) * 6;\n  return m1;\n}\n\nfunction parseCSSColor(css_str) {\n  // Remove all whitespace, not compliant, but should just be more accepting.\n  var str = css_str.replace(/ /g, '').toLowerCase();\n\n  // Color keywords (and transparent) lookup.\n  if (str in kCSSColorTable) return kCSSColorTable[str].slice();  // dup.\n\n  // #abc and #abc123 syntax.\n  if (str[0] === '#') {\n    if (str.length === 4) {\n      var iv = parseInt(str.substr(1), 16);  // TODO(deanm): Stricter parsing.\n      if (!(iv >= 0 && iv <= 0xfff)) return null;  // Covers NaN.\n      return [((iv & 0xf00) >> 4) | ((iv & 0xf00) >> 8),\n              (iv & 0xf0) | ((iv & 0xf0) >> 4),\n              (iv & 0xf) | ((iv & 0xf) << 4),\n              1];\n    } else if (str.length === 7) {\n      var iv = parseInt(str.substr(1), 16);  // TODO(deanm): Stricter parsing.\n      if (!(iv >= 0 && iv <= 0xffffff)) return null;  // Covers NaN.\n      return [(iv & 0xff0000) >> 16,\n              (iv & 0xff00) >> 8,\n              iv & 0xff,\n              1];\n    }\n\n    return null;\n  }\n\n  var op = str.indexOf('('), ep = str.indexOf(')');\n  if (op !== -1 && ep + 1 === str.length) {\n    var fname = str.substr(0, op);\n    var params = str.substr(op+1, ep-(op+1)).split(',');\n    var alpha = 1;  // To allow case fallthrough.\n    switch (fname) {\n      case 'rgba':\n        if (params.length !== 4) return null;\n        alpha = parse_css_float(params.pop());\n        // Fall through.\n      case 'rgb':\n        if (params.length !== 3) return null;\n        return [parse_css_int(params[0]),\n                parse_css_int(params[1]),\n                parse_css_int(params[2]),\n                alpha];\n      case 'hsla':\n        if (params.length !== 4) return null;\n        alpha = parse_css_float(params.pop());\n        // Fall through.\n      case 'hsl':\n        if (params.length !== 3) return null;\n        var h = (((parseFloat(params[0]) % 360) + 360) % 360) / 360;  // 0 .. 1\n        // NOTE(deanm): According to the CSS spec s/l should only be\n        // percentages, but we don't bother and let float or percentage.\n        var s = parse_css_float(params[1]);\n        var l = parse_css_float(params[2]);\n        var m2 = l <= 0.5 ? l * (s + 1) : l + s - l * s;\n        var m1 = l * 2 - m2;\n        return [clamp_css_byte(css_hue_to_rgb(m1, m2, h+1/3) * 255),\n                clamp_css_byte(css_hue_to_rgb(m1, m2, h) * 255),\n                clamp_css_byte(css_hue_to_rgb(m1, m2, h-1/3) * 255),\n                alpha];\n      default:\n        return null;\n    }\n  }\n\n  return null;\n}\n\ntry { exports.parseCSSColor = parseCSSColor } catch(e) { }\n","// @flow\n\nimport { parseCSSColor } from 'csscolorparser';\n\n/**\n * An RGBA color value. Create instances from color strings using the static\n * method `Color.parse`. The constructor accepts RGB channel values in the range\n * `[0, 1]`, premultiplied by A.\n *\n * @param {number} r The red channel.\n * @param {number} g The green channel.\n * @param {number} b The blue channel.\n * @param {number} a The alpha channel.\n * @private\n */\nclass Color {\n    r: number;\n    g: number;\n    b: number;\n    a: number;\n\n    constructor(r: number, g: number, b: number, a: number = 1) {\n        this.r = r;\n        this.g = g;\n        this.b = b;\n        this.a = a;\n    }\n\n    static black: Color;\n    static white: Color;\n    static transparent: Color;\n    static red: Color;\n\n    /**\n     * Parses valid CSS color strings and returns a `Color` instance.\n     * @returns A `Color` instance, or `undefined` if the input is not a valid color string.\n     */\n    static parse(input: ?string): Color | void {\n        if (!input) {\n            return undefined;\n        }\n\n        if (input instanceof Color) {\n            return input;\n        }\n\n        if (typeof input !== 'string') {\n            return undefined;\n        }\n\n        const rgba = parseCSSColor(input);\n        if (!rgba) {\n            return undefined;\n        }\n\n        return new Color(\n            rgba[0] / 255 * rgba[3],\n            rgba[1] / 255 * rgba[3],\n            rgba[2] / 255 * rgba[3],\n            rgba[3]\n        );\n    }\n\n    /**\n     * Returns an RGBA string representing the color value.\n     *\n     * @returns An RGBA string.\n     * @example\n     * var purple = new Color.parse('purple');\n     * purple.toString; // = \"rgba(128,0,128,1)\"\n     * var translucentGreen = new Color.parse('rgba(26, 207, 26, .73)');\n     * translucentGreen.toString(); // = \"rgba(26,207,26,0.73)\"\n     */\n    toString(): string {\n        const [r, g, b, a] = this.toArray();\n        return `rgba(${Math.round(r)},${Math.round(g)},${Math.round(b)},${a})`;\n    }\n\n    toArray(): [number, number, number, number] {\n        const {r, g, b, a} = this;\n        return a === 0 ? [0, 0, 0, 0] : [\n            r * 255 / a,\n            g * 255 / a,\n            b * 255 / a,\n            a\n        ];\n    }\n}\n\nColor.black = new Color(0, 0, 0, 1);\nColor.white = new Color(1, 1, 1, 1);\nColor.transparent = new Color(0, 0, 0, 0);\nColor.red = new Color(1, 0, 0, 1);\n\nexport default Color;\n","// @flow\n\n// Flow type declarations for Intl cribbed from\n// https://github.com/facebook/flow/issues/1270\n\ndeclare var Intl: {\n    Collator: Class<Intl$Collator>\n};\n\ndeclare class Intl$Collator {\n    constructor (\n        locales?: string | string[],\n        options?: CollatorOptions\n    ): Intl$Collator;\n\n    static (\n        locales?: string | string[],\n        options?: CollatorOptions\n    ): Intl$Collator;\n\n    compare (a: string, b: string): number;\n\n    resolvedOptions(): any;\n}\n\ntype CollatorOptions = {\n    localeMatcher?: 'lookup' | 'best fit',\n    usage?: 'sort' | 'search',\n    sensitivity?: 'base' | 'accent' | 'case' | 'variant',\n    ignorePunctuation?: boolean,\n    numeric?: boolean,\n    caseFirst?: 'upper' | 'lower' | 'false'\n}\n\nexport default class Collator {\n    locale: string | null;\n    sensitivity: 'base' | 'accent' | 'case' | 'variant';\n    collator: Intl$Collator;\n\n    constructor(caseSensitive: boolean, diacriticSensitive: boolean, locale: string | null) {\n        if (caseSensitive)\n            this.sensitivity = diacriticSensitive ? 'variant' : 'case';\n        else\n            this.sensitivity = diacriticSensitive ? 'accent' : 'base';\n\n        this.locale = locale;\n        this.collator = new Intl.Collator(this.locale ? this.locale : [],\n            { sensitivity: this.sensitivity, usage: 'search' });\n    }\n\n    compare(lhs: string, rhs: string): number {\n        return this.collator.compare(lhs, rhs);\n    }\n\n    resolvedLocale(): string {\n        // We create a Collator without \"usage: search\" because we don't want\n        // the search options encoded in our result (e.g. \"en-u-co-search\")\n        return new Intl.Collator(this.locale ? this.locale : [])\n            .resolvedOptions().locale;\n    }\n}\n","// @flow\n\nexport class FormattedSection {\n    text: string;\n    scale: number | null;\n    fontStack: string | null;\n\n    constructor(text: string, scale: number | null, fontStack: string | null) {\n        this.text = text;\n        this.scale = scale;\n        this.fontStack = fontStack;\n    }\n}\n\nexport default class Formatted {\n    sections: Array<FormattedSection>;\n\n    constructor(sections: Array<FormattedSection>) {\n        this.sections = sections;\n    }\n\n    static fromString(unformatted: string): Formatted {\n        return new Formatted([new FormattedSection(unformatted, null, null)]);\n    }\n\n    toString(): string {\n        return this.sections.map(section => section.text).join('');\n    }\n\n    serialize() {\n        const serialized = [\"format\"];\n        for (const section of this.sections) {\n            serialized.push(section.text);\n            const options = {};\n            if (section.fontStack) {\n                options[\"text-font\"] = [\"literal\", section.fontStack.split(',')];\n            }\n            if (section.scale) {\n                options[\"font-scale\"] = section.scale;\n            }\n            serialized.push(options);\n        }\n        return serialized;\n    }\n}\n","// @flow\n\nimport assert from 'assert';\n\nimport Color from '../util/color';\nimport Collator from './types/collator';\nimport Formatted from './types/formatted';\nimport { NullType, NumberType, StringType, BooleanType, ColorType, ObjectType, ValueType, CollatorType, FormattedType, array } from './types';\n\nimport type { Type } from './types';\n\nexport function validateRGBA(r: mixed, g: mixed, b: mixed, a?: mixed): ?string {\n    if (!(\n        typeof r === 'number' && r >= 0 && r <= 255 &&\n        typeof g === 'number' && g >= 0 && g <= 255 &&\n        typeof b === 'number' && b >= 0 && b <= 255\n    )) {\n        const value = typeof a === 'number' ? [r, g, b, a] : [r, g, b];\n        return `Invalid rgba value [${value.join(', ')}]: 'r', 'g', and 'b' must be between 0 and 255.`;\n    }\n\n    if (!(\n        typeof a === 'undefined' || (typeof a === 'number' && a >= 0 && a <= 1)\n    )) {\n        return `Invalid rgba value [${[r, g, b, a].join(', ')}]: 'a' must be between 0 and 1.`;\n    }\n\n    return null;\n}\n\nexport type Value = null | string | boolean | number | Color | Collator | Formatted | $ReadOnlyArray<Value> | { +[string]: Value }\n\nexport function isValue(mixed: mixed): boolean {\n    if (mixed === null) {\n        return true;\n    } else if (typeof mixed === 'string') {\n        return true;\n    } else if (typeof mixed === 'boolean') {\n        return true;\n    } else if (typeof mixed === 'number') {\n        return true;\n    } else if (mixed instanceof Color) {\n        return true;\n    } else if (mixed instanceof Collator) {\n        return true;\n    } else if (mixed instanceof Formatted) {\n        return true;\n    } else if (Array.isArray(mixed)) {\n        for (const item of mixed) {\n            if (!isValue(item)) {\n                return false;\n            }\n        }\n        return true;\n    } else if (typeof mixed === 'object') {\n        for (const key in mixed) {\n            if (!isValue(mixed[key])) {\n                return false;\n            }\n        }\n        return true;\n    } else {\n        return false;\n    }\n}\n\nexport function typeOf(value: Value): Type {\n    if (value === null) {\n        return NullType;\n    } else if (typeof value === 'string') {\n        return StringType;\n    } else if (typeof value === 'boolean') {\n        return BooleanType;\n    } else if (typeof value === 'number') {\n        return NumberType;\n    } else if (value instanceof Color) {\n        return ColorType;\n    } else if (value instanceof Collator) {\n        return CollatorType;\n    } else if (value instanceof Formatted) {\n        return FormattedType;\n    } else if (Array.isArray(value)) {\n        const length = value.length;\n        let itemType: ?Type;\n\n        for (const item of value) {\n            const t = typeOf(item);\n            if (!itemType) {\n                itemType = t;\n            } else if (itemType === t) {\n                continue;\n            } else {\n                itemType = ValueType;\n                break;\n            }\n        }\n\n        return array(itemType || ValueType, length);\n    } else {\n        assert(typeof value === 'object');\n        return ObjectType;\n    }\n}\n\nexport function toString(value: Value) {\n    const type = typeof value;\n    if (value === null) {\n        return '';\n    } else if (type === 'string' || type === 'number' || type === 'boolean') {\n        return String(value);\n    } else if (value instanceof Color || value instanceof Formatted) {\n        return value.toString();\n    } else {\n        return JSON.stringify(value);\n    }\n}\n\nexport { Color, Collator };\n","// @flow\n\nimport assert from 'assert';\nimport { isValue, typeOf, Color } from '../values';\nimport Formatted from '../types/formatted';\n\nimport type { Type } from '../types';\nimport type { Value }  from '../values';\nimport type { Expression } from '../expression';\nimport type ParsingContext from '../parsing_context';\n\nclass Literal implements Expression {\n    type: Type;\n    value: Value;\n\n    constructor(type: Type, value: Value) {\n        this.type = type;\n        this.value = value;\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext) {\n        if (args.length !== 2)\n            return context.error(`'literal' expression requires exactly one argument, but found ${args.length - 1} instead.`);\n\n        if (!isValue(args[1]))\n            return context.error(`invalid value`);\n\n        const value = (args[1]: any);\n        let type = typeOf(value);\n\n        // special case: infer the item type if possible for zero-length arrays\n        const expected = context.expectedType;\n        if (\n            type.kind === 'array' &&\n            type.N === 0 &&\n            expected &&\n            expected.kind === 'array' &&\n            (typeof expected.N !== 'number' || expected.N === 0)\n        ) {\n            type = expected;\n        }\n\n        return new Literal(type, value);\n    }\n\n    evaluate() {\n        return this.value;\n    }\n\n    eachChild() {}\n\n    possibleOutputs() {\n        return [this.value];\n    }\n\n    serialize(): Array<mixed> {\n        if (this.type.kind === 'array' || this.type.kind === 'object') {\n            return [\"literal\", this.value];\n        } else if (this.value instanceof Color) {\n            // Constant-folding can generate Literal expressions that you\n            // couldn't actually generate with a \"literal\" expression,\n            // so we have to implement an equivalent serialization here\n            return [\"rgba\"].concat(this.value.toArray());\n        } else if (this.value instanceof Formatted) {\n            // Same as Color\n            return this.value.serialize();\n        } else {\n            assert(this.value === null ||\n                typeof this.value === 'string' ||\n                typeof this.value === 'number' ||\n                typeof this.value === 'boolean');\n            return (this.value: any);\n        }\n    }\n}\n\nexport default Literal;\n","// @flow\n\nclass RuntimeError {\n    name: string;\n    message: string;\n\n    constructor(message: string) {\n        this.name = 'ExpressionEvaluationError';\n        this.message = message;\n    }\n\n    toJSON() {\n        return this.message;\n    }\n}\n\nexport default RuntimeError;\n","// @flow\n\nimport assert from 'assert';\n\nimport {\n    ObjectType,\n    ValueType,\n    StringType,\n    NumberType,\n    BooleanType,\n    checkSubtype,\n    toString,\n    array\n} from '../types';\nimport RuntimeError from '../runtime_error';\nimport { typeOf } from '../values';\n\nimport type { Expression } from '../expression';\nimport type ParsingContext from '../parsing_context';\nimport type EvaluationContext from '../evaluation_context';\nimport type { Value } from '../values';\nimport type { Type } from '../types';\n\nconst types = {\n    string: StringType,\n    number: NumberType,\n    boolean: BooleanType,\n    object: ObjectType\n};\n\nclass Assertion implements Expression {\n    type: Type;\n    args: Array<Expression>;\n\n    constructor(type: Type, args: Array<Expression>) {\n        this.type = type;\n        this.args = args;\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext): ?Expression {\n        if (args.length < 2)\n            return context.error(`Expected at least one argument.`);\n\n        let i = 1;\n        let type;\n\n        const name: string = (args[0]: any);\n        if (name === 'array') {\n            let itemType;\n            if (args.length > 2) {\n                const type = args[1];\n                if (typeof type !== 'string' || !(type in types) || type === 'object')\n                    return context.error('The item type argument of \"array\" must be one of string, number, boolean', 1);\n                itemType = types[type];\n                i++;\n            } else {\n                itemType = ValueType;\n            }\n\n            let N;\n            if (args.length > 3) {\n                if (args[2] !== null &&\n                    (typeof args[2] !== 'number' ||\n                        args[2] < 0 ||\n                        args[2] !== Math.floor(args[2]))\n                ) {\n                    return context.error('The length argument to \"array\" must be a positive integer literal', 2);\n                }\n                N = args[2];\n                i++;\n            }\n\n            type = array(itemType, N);\n        } else {\n            assert(types[name], name);\n            type = types[name];\n        }\n\n        const parsed = [];\n        for (; i < args.length; i++) {\n            const input = context.parse(args[i], i, ValueType);\n            if (!input) return null;\n            parsed.push(input);\n        }\n\n        return new Assertion(type, parsed);\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        for (let i = 0; i < this.args.length; i++) {\n            const value = this.args[i].evaluate(ctx);\n            const error = checkSubtype(this.type, typeOf(value));\n            if (!error) {\n                return value;\n            } else if (i === this.args.length - 1) {\n                throw new RuntimeError(`Expected value to be of type ${toString(this.type)}, but found ${toString(typeOf(value))} instead.`);\n            }\n        }\n\n        assert(false);\n        return null;\n    }\n\n    eachChild(fn: (Expression) => void) {\n        this.args.forEach(fn);\n    }\n\n    possibleOutputs(): Array<Value | void> {\n        return [].concat(...this.args.map((arg) => arg.possibleOutputs()));\n    }\n\n    serialize(): Array<mixed> {\n        const type = this.type;\n        const serialized = [type.kind];\n        if (type.kind === 'array') {\n            const itemType = type.itemType;\n            if (itemType.kind === 'string' ||\n                itemType.kind === 'number' ||\n                itemType.kind === 'boolean') {\n                serialized.push(itemType.kind);\n                const N = type.N;\n                if (typeof N === 'number' || this.args.length > 1) {\n                    serialized.push(N);\n                }\n            }\n        }\n        return serialized.concat(this.args.map(arg => arg.serialize()));\n    }\n}\n\nexport default Assertion;\n","// @flow\n\nimport { NumberType, ValueType, FormattedType, array, StringType } from '../types';\nimport Formatted, { FormattedSection } from '../types/formatted';\nimport { toString } from '../values';\n\nimport type { Expression } from '../expression';\nimport type EvaluationContext from '../evaluation_context';\nimport type ParsingContext from '../parsing_context';\nimport type { Type } from '../types';\n\ntype FormattedSectionExpression = {\n    text: Expression,\n    scale: Expression | null;\n    font: Expression | null;\n}\n\nexport default class FormatExpression implements Expression {\n    type: Type;\n    sections: Array<FormattedSectionExpression>;\n\n    constructor(sections: Array<FormattedSectionExpression>) {\n        this.type = FormattedType;\n        this.sections = sections;\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext): ?Expression {\n        if (args.length < 3) {\n            return context.error(`Expected at least two arguments.`);\n        }\n\n        if ((args.length - 1) % 2 !== 0) {\n            return context.error(`Expected an even number of arguments.`);\n        }\n\n        const sections: Array<FormattedSectionExpression> = [];\n        for (let i = 1; i < args.length - 1; i += 2) {\n            const text = context.parse(args[i], 1, ValueType);\n            if (!text) return null;\n            const kind = text.type.kind;\n            if (kind !== 'string' && kind !== 'value' && kind !== 'null')\n                return context.error(`Formatted text type must be 'string', 'value', or 'null'.`);\n\n            const options = (args[i + 1]: any);\n            if (typeof options !== \"object\" || Array.isArray(options))\n                return context.error(`Format options argument must be an object.`);\n\n            let scale = null;\n            if (options['font-scale']) {\n                scale = context.parse(options['font-scale'], 1, NumberType);\n                if (!scale) return null;\n            }\n\n            let font = null;\n            if (options['text-font']) {\n                font = context.parse(options['text-font'], 1, array(StringType));\n                if (!font) return null;\n            }\n            sections.push({text, scale, font});\n        }\n\n        return new FormatExpression(sections);\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        return new Formatted(\n            this.sections.map(section =>\n                new FormattedSection(\n                    toString(section.text.evaluate(ctx)),\n                    section.scale ? section.scale.evaluate(ctx) : null,\n                    section.font ? section.font.evaluate(ctx).join(',') : null\n                )\n            )\n        );\n    }\n\n    eachChild(fn: (Expression) => void) {\n        for (const section of this.sections) {\n            fn(section.text);\n            if (section.scale) {\n                fn(section.scale);\n            }\n            if (section.font) {\n                fn(section.font);\n            }\n        }\n    }\n\n    possibleOutputs() {\n        // Technically the combinatoric set of all children\n        // Usually, this.text will be undefined anyway\n        return [undefined];\n    }\n\n    serialize() {\n        const serialized = [\"format\"];\n        for (const section of this.sections) {\n            serialized.push(section.text.serialize());\n            const options = {};\n            if (section.scale) {\n                options['font-scale'] = section.scale.serialize();\n            }\n            if (section.font) {\n                options['text-font'] = section.font.serialize();\n            }\n            serialized.push(options);\n        }\n        return serialized;\n    }\n}\n","// @flow\n\nimport assert from 'assert';\n\nimport {BooleanType, ColorType, NumberType, StringType, ValueType} from '../types';\nimport {Color, toString as valueToString, validateRGBA} from '../values';\nimport RuntimeError from '../runtime_error';\nimport Formatted from '../types/formatted';\nimport FormatExpression from '../definitions/format';\n\nimport type { Expression } from '../expression';\nimport type ParsingContext from '../parsing_context';\nimport type EvaluationContext from '../evaluation_context';\nimport type { Value } from '../values';\nimport type { Type } from '../types';\n\nconst types = {\n    'to-boolean': BooleanType,\n    'to-color': ColorType,\n    'to-number': NumberType,\n    'to-string': StringType\n};\n\n/**\n * Special form for error-coalescing coercion expressions \"to-number\",\n * \"to-color\".  Since these coercions can fail at runtime, they accept multiple\n * arguments, only evaluating one at a time until one succeeds.\n *\n * @private\n */\nclass Coercion implements Expression {\n    type: Type;\n    args: Array<Expression>;\n\n    constructor(type: Type, args: Array<Expression>) {\n        this.type = type;\n        this.args = args;\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext): ?Expression {\n        if (args.length < 2)\n            return context.error(`Expected at least one argument.`);\n\n        const name: string = (args[0]: any);\n        assert(types[name], name);\n\n        if ((name === 'to-boolean' || name === 'to-string') && args.length !== 2)\n            return context.error(`Expected one argument.`);\n\n        const type = types[name];\n\n        const parsed = [];\n        for (let i = 1; i < args.length; i++) {\n            const input = context.parse(args[i], i, ValueType);\n            if (!input) return null;\n            parsed.push(input);\n        }\n\n        return new Coercion(type, parsed);\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        if (this.type.kind === 'boolean') {\n            return Boolean(this.args[0].evaluate(ctx));\n        } else if (this.type.kind === 'color') {\n            let input;\n            let error;\n            for (const arg of this.args) {\n                input = arg.evaluate(ctx);\n                error = null;\n                if (input instanceof Color) {\n                    return input;\n                } else if (typeof input === 'string') {\n                    const c = ctx.parseColor(input);\n                    if (c) return c;\n                } else if (Array.isArray(input)) {\n                    if (input.length < 3 || input.length > 4) {\n                        error = `Invalid rbga value ${JSON.stringify(input)}: expected an array containing either three or four numeric values.`;\n                    } else {\n                        error = validateRGBA(input[0], input[1], input[2], input[3]);\n                    }\n                    if (!error) {\n                        return new Color((input[0]: any) / 255, (input[1]: any) / 255, (input[2]: any) / 255, (input[3]: any));\n                    }\n                }\n            }\n            throw new RuntimeError(error || `Could not parse color from value '${typeof input === 'string' ? input : JSON.stringify(input)}'`);\n        } else if (this.type.kind === 'number') {\n            let value = null;\n            for (const arg of this.args) {\n                value = arg.evaluate(ctx);\n                if (value === null) return 0;\n                const num = Number(value);\n                if (isNaN(num)) continue;\n                return num;\n            }\n            throw new RuntimeError(`Could not convert ${JSON.stringify(value)} to number.`);\n        } else if (this.type.kind === 'formatted') {\n            // There is no explicit 'to-formatted' but this coercion can be implicitly\n            // created by properties that expect the 'formatted' type.\n            return Formatted.fromString(valueToString(this.args[0].evaluate(ctx)));\n        } else {\n            return valueToString(this.args[0].evaluate(ctx));\n        }\n    }\n\n    eachChild(fn: (Expression) => void) {\n        this.args.forEach(fn);\n    }\n\n    possibleOutputs(): Array<Value | void> {\n        return [].concat(...this.args.map((arg) => arg.possibleOutputs()));\n    }\n\n    serialize() {\n        if (this.type.kind === 'formatted') {\n            return new FormatExpression([{text: this.args[0], scale: null, font: null}]).serialize();\n        }\n        const serialized = [`to-${this.type.kind}`];\n        this.eachChild(child => { serialized.push(child.serialize()); });\n        return serialized;\n    }\n}\n\nexport default Coercion;\n","// @flow\n\nimport { Color } from './values';\n\nimport type { GlobalProperties, Feature, FeatureState } from './index';\n\nconst geometryTypes = ['Unknown', 'Point', 'LineString', 'Polygon'];\n\nclass EvaluationContext {\n    globals: GlobalProperties;\n    feature: ?Feature;\n    featureState: ?FeatureState;\n\n    _parseColorCache: {[string]: ?Color};\n\n    constructor() {\n        this.globals = (null: any);\n        this.feature = null;\n        this.featureState = null;\n        this._parseColorCache = {};\n    }\n\n    id() {\n        return this.feature && 'id' in this.feature ? this.feature.id : null;\n    }\n\n    geometryType() {\n        return this.feature ? typeof this.feature.type === 'number' ? geometryTypes[this.feature.type] : this.feature.type : null;\n    }\n\n    properties() {\n        return this.feature && this.feature.properties || {};\n    }\n\n    parseColor(input: string): ?Color {\n        let cached = this._parseColorCache[input];\n        if (!cached) {\n            cached = this._parseColorCache[input] = Color.parse(input);\n        }\n        return cached;\n    }\n}\n\nexport default EvaluationContext;\n","// @flow\n\nimport { toString } from './types';\n\nimport ParsingContext from './parsing_context';\nimport EvaluationContext from './evaluation_context';\nimport assert from 'assert';\n\nimport type { Expression, ExpressionRegistry } from './expression';\nimport type { Type } from './types';\nimport type { Value } from './values';\n\nexport type Varargs = {| type: Type |};\ntype Signature = Array<Type> | Varargs;\ntype Evaluate = (EvaluationContext, Array<Expression>) => Value;\ntype Definition = [Type, Signature, Evaluate] |\n    {|type: Type, overloads: Array<[Signature, Evaluate]>|};\n\nclass CompoundExpression implements Expression {\n    name: string;\n    type: Type;\n    _evaluate: Evaluate;\n    args: Array<Expression>;\n\n    static definitions: { [string]: Definition };\n\n    constructor(name: string, type: Type, evaluate: Evaluate, args: Array<Expression>) {\n        this.name = name;\n        this.type = type;\n        this._evaluate = evaluate;\n        this.args = args;\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        return this._evaluate(ctx, this.args);\n    }\n\n    eachChild(fn: (Expression) => void) {\n        this.args.forEach(fn);\n    }\n\n    possibleOutputs() {\n        return [undefined];\n    }\n\n    serialize(): Array<mixed> {\n        return [this.name].concat(this.args.map(arg => arg.serialize()));\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext): ?Expression {\n        const op: string = (args[0]: any);\n        const definition = CompoundExpression.definitions[op];\n        if (!definition) {\n            return context.error(`Unknown expression \"${op}\". If you wanted a literal array, use [\"literal\", [...]].`, 0);\n        }\n\n        // Now check argument types against each signature\n        const type = Array.isArray(definition) ?\n            definition[0] : definition.type;\n\n        const availableOverloads = Array.isArray(definition) ?\n            [[definition[1], definition[2]]] :\n            definition.overloads;\n\n        const overloads = availableOverloads.filter(([signature]) => (\n            !Array.isArray(signature) || // varags\n            signature.length === args.length - 1 // correct param count\n        ));\n\n        let signatureContext: ParsingContext = (null: any);\n\n        for (const [params, evaluate] of overloads) {\n            // Use a fresh context for each attempted signature so that, if\n            // we eventually succeed, we haven't polluted `context.errors`.\n            signatureContext = new ParsingContext(context.registry, context.path, null, context.scope);\n\n            // First parse all the args, potentially coercing to the\n            // types expected by this overload.\n            const parsedArgs: Array<Expression> = [];\n            let argParseFailed = false;\n            for (let i = 1; i < args.length; i++) {\n                const arg = args[i];\n                const expectedType = Array.isArray(params) ?\n                    params[i - 1] :\n                    params.type;\n\n                const parsed = signatureContext.parse(arg, 1 + parsedArgs.length, expectedType);\n                if (!parsed) {\n                    argParseFailed = true;\n                    break;\n                }\n                parsedArgs.push(parsed);\n            }\n            if (argParseFailed) {\n                // Couldn't coerce args of this overload to expected type, move\n                // on to next one.\n                continue;\n            }\n\n            if (Array.isArray(params)) {\n                if (params.length !== parsedArgs.length) {\n                    signatureContext.error(`Expected ${params.length} arguments, but found ${parsedArgs.length} instead.`);\n                    continue;\n                }\n            }\n\n            for (let i = 0; i < parsedArgs.length; i++) {\n                const expected = Array.isArray(params) ? params[i] : params.type;\n                const arg = parsedArgs[i];\n                signatureContext.concat(i + 1).checkSubtype(expected, arg.type);\n            }\n\n            if (signatureContext.errors.length === 0) {\n                return new CompoundExpression(op, type, evaluate, parsedArgs);\n            }\n        }\n\n        assert(!signatureContext || signatureContext.errors.length > 0);\n\n        if (overloads.length === 1) {\n            context.errors.push.apply(context.errors, signatureContext.errors);\n        } else {\n            const expected = overloads.length ? overloads : availableOverloads;\n            const signatures = expected\n                .map(([params]) => stringifySignature(params))\n                .join(' | ');\n\n            const actualTypes = [];\n            // For error message, re-parse arguments without trying to\n            // apply any coercions\n            for (let i = 1; i < args.length; i++) {\n                const parsed = context.parse(args[i], 1 + actualTypes.length);\n                if (!parsed) return null;\n                actualTypes.push(toString(parsed.type));\n            }\n            context.error(`Expected arguments of type ${signatures}, but found (${actualTypes.join(', ')}) instead.`);\n        }\n\n        return null;\n    }\n\n    static register(\n        registry: ExpressionRegistry,\n        definitions: { [string]: Definition }\n    ) {\n        assert(!CompoundExpression.definitions);\n        CompoundExpression.definitions = definitions;\n        for (const name in definitions) {\n            registry[name] = CompoundExpression;\n        }\n    }\n}\n\nfunction stringifySignature(signature: Signature): string {\n    if (Array.isArray(signature)) {\n        return `(${signature.map(toString).join(', ')})`;\n    } else {\n        return `(${toString(signature.type)}...)`;\n    }\n}\n\nexport default CompoundExpression;\n","// @flow\n\nimport { StringType, BooleanType, CollatorType } from '../types';\nimport Collator from '../types/collator';\n\nimport type { Expression } from '../expression';\nimport type EvaluationContext from '../evaluation_context';\nimport type ParsingContext from '../parsing_context';\nimport type { Type } from '../types';\n\nexport default class CollatorExpression implements Expression {\n    type: Type;\n    caseSensitive: Expression;\n    diacriticSensitive: Expression;\n    locale: Expression | null;\n\n    constructor(caseSensitive: Expression, diacriticSensitive: Expression, locale: Expression | null) {\n        this.type = CollatorType;\n        this.locale = locale;\n        this.caseSensitive = caseSensitive;\n        this.diacriticSensitive = diacriticSensitive;\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext): ?Expression {\n        if (args.length !== 2)\n            return context.error(`Expected one argument.`);\n\n        const options = (args[1]: any);\n        if (typeof options !== \"object\" || Array.isArray(options))\n            return context.error(`Collator options argument must be an object.`);\n\n        const caseSensitive = context.parse(\n            options['case-sensitive'] === undefined ? false : options['case-sensitive'], 1, BooleanType);\n        if (!caseSensitive) return null;\n\n        const diacriticSensitive = context.parse(\n            options['diacritic-sensitive'] === undefined ? false : options['diacritic-sensitive'], 1, BooleanType);\n        if (!diacriticSensitive) return null;\n\n        let locale = null;\n        if (options['locale']) {\n            locale = context.parse(options['locale'], 1, StringType);\n            if (!locale) return null;\n        }\n\n        return new CollatorExpression(caseSensitive, diacriticSensitive, locale);\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        return new Collator(this.caseSensitive.evaluate(ctx), this.diacriticSensitive.evaluate(ctx), this.locale ? this.locale.evaluate(ctx) : null);\n    }\n\n    eachChild(fn: (Expression) => void) {\n        fn(this.caseSensitive);\n        fn(this.diacriticSensitive);\n        if (this.locale) {\n            fn(this.locale);\n        }\n    }\n\n    possibleOutputs() {\n        // Technically the set of possible outputs is the combinatoric set of Collators produced\n        // by all possibleOutputs of locale/caseSensitive/diacriticSensitive\n        // But for the primary use of Collators in comparison operators, we ignore the Collator's\n        // possibleOutputs anyway, so we can get away with leaving this undefined for now.\n        return [undefined];\n    }\n\n    serialize() {\n        const options = {};\n        options['case-sensitive'] = this.caseSensitive.serialize();\n        options['diacritic-sensitive'] = this.diacriticSensitive.serialize();\n        if (this.locale) {\n            options['locale'] = this.locale.serialize();\n        }\n        return [\"collator\", options];\n    }\n}\n","// @flow\n\nimport CompoundExpression from './compound_expression';\n\nimport type { Expression } from './expression.js';\n\nfunction isFeatureConstant(e: Expression) {\n    if (e instanceof CompoundExpression) {\n        if (e.name === 'get' && e.args.length === 1) {\n            return false;\n        } else if (e.name === 'feature-state') {\n            return false;\n        } else if (e.name === 'has' && e.args.length === 1) {\n            return false;\n        } else if (\n            e.name === 'properties' ||\n            e.name === 'geometry-type' ||\n            e.name === 'id'\n        ) {\n            return false;\n        } else if (/^filter-/.test(e.name)) {\n            return false;\n        }\n    }\n\n    let result = true;\n    e.eachChild(arg => {\n        if (result && !isFeatureConstant(arg)) { result = false; }\n    });\n    return result;\n}\n\nfunction isStateConstant(e: Expression) {\n    if (e instanceof CompoundExpression) {\n        if (e.name === 'feature-state') {\n            return false;\n        }\n    }\n    let result = true;\n    e.eachChild(arg => {\n        if (result && !isStateConstant(arg)) { result = false; }\n    });\n    return result;\n}\n\nfunction isGlobalPropertyConstant(e: Expression, properties: Array<string>) {\n    if (e instanceof CompoundExpression && properties.indexOf(e.name) >= 0) { return false; }\n    let result = true;\n    e.eachChild((arg) => {\n        if (result && !isGlobalPropertyConstant(arg, properties)) { result = false; }\n    });\n    return result;\n}\n\nexport { isFeatureConstant, isGlobalPropertyConstant, isStateConstant };\n","// @flow\n\nimport type { Type } from '../types';\nimport type { Expression } from '../expression';\nimport type ParsingContext from '../parsing_context';\nimport type EvaluationContext  from '../evaluation_context';\n\nclass Var implements Expression {\n    type: Type;\n    name: string;\n    boundExpression: Expression;\n\n    constructor(name: string, boundExpression: Expression) {\n        this.type = boundExpression.type;\n        this.name = name;\n        this.boundExpression = boundExpression;\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext) {\n        if (args.length !== 2 || typeof args[1] !== 'string')\n            return context.error(`'var' expression requires exactly one string literal argument.`);\n\n        const name = args[1];\n        if (!context.scope.has(name)) {\n            return context.error(`Unknown variable \"${name}\". Make sure \"${name}\" has been bound in an enclosing \"let\" expression before using it.`, 1);\n        }\n\n        return new Var(name, context.scope.get(name));\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        return this.boundExpression.evaluate(ctx);\n    }\n\n    eachChild() {}\n\n    possibleOutputs() {\n        return [undefined];\n    }\n\n    serialize() {\n        return [\"var\", this.name];\n    }\n}\n\nexport default Var;\n","// @flow\n\nimport Scope from './scope';\nimport { checkSubtype } from './types';\nimport ParsingError from './parsing_error';\nimport Literal from './definitions/literal';\nimport Assertion from './definitions/assertion';\nimport Coercion from './definitions/coercion';\nimport EvaluationContext from './evaluation_context';\nimport CompoundExpression from './compound_expression';\nimport CollatorExpression from './definitions/collator';\nimport {isGlobalPropertyConstant, isFeatureConstant} from './is_constant';\nimport Var from './definitions/var';\n\n\nimport type {Expression, ExpressionRegistry} from './expression';\nimport type {Type} from './types';\n\n/**\n * State associated parsing at a given point in an expression tree.\n * @private\n */\nclass ParsingContext {\n    registry: ExpressionRegistry;\n    path: Array<number>;\n    key: string;\n    scope: Scope;\n    errors: Array<ParsingError>;\n\n    // The expected type of this expression. Provided only to allow Expression\n    // implementations to infer argument types: Expression#parse() need not\n    // check that the output type of the parsed expression matches\n    // `expectedType`.\n    expectedType: ?Type;\n\n    constructor(\n        registry: ExpressionRegistry,\n        path: Array<number> = [],\n        expectedType: ?Type,\n        scope: Scope = new Scope(),\n        errors: Array<ParsingError> = []\n    ) {\n        this.registry = registry;\n        this.path = path;\n        this.key = path.map(part => `[${part}]`).join('');\n        this.scope = scope;\n        this.errors = errors;\n        this.expectedType = expectedType;\n    }\n\n    /**\n     * @param expr the JSON expression to parse\n     * @param index the optional argument index if this expression is an argument of a parent expression that's being parsed\n     * @param options\n     * @param options.omitTypeAnnotations set true to omit inferred type annotations.  Caller beware: with this option set, the parsed expression's type will NOT satisfy `expectedType` if it would normally be wrapped in an inferred annotation.\n     * @private\n     */\n    parse(\n        expr: mixed,\n        index?: number,\n        expectedType?: ?Type,\n        bindings?: Array<[string, Expression]>,\n        options: {typeAnnotation?: 'assert' | 'coerce' | 'omit'} = {}\n    ): ?Expression {\n        if (index) {\n            return this.concat(index, expectedType, bindings)._parse(expr, options);\n        }\n        return this._parse(expr, options);\n    }\n\n    _parse(expr: mixed, options: {typeAnnotation?: 'assert' | 'coerce' | 'omit'}): ?Expression {\n        if (expr === null || typeof expr === 'string' || typeof expr === 'boolean' || typeof expr === 'number') {\n            expr = ['literal', expr];\n        }\n\n        function annotate(parsed, type, typeAnnotation: 'assert' | 'coerce' | 'omit') {\n            if (typeAnnotation === 'assert') {\n                return new Assertion(type, [parsed]);\n            } else if (typeAnnotation === 'coerce') {\n                return new Coercion(type, [parsed]);\n            } else {\n                return parsed;\n            }\n        }\n\n        if (Array.isArray(expr)) {\n            if (expr.length === 0) {\n                return this.error(`Expected an array with at least one element. If you wanted a literal array, use [\"literal\", []].`);\n            }\n\n            const op = expr[0];\n            if (typeof op !== 'string') {\n                this.error(`Expression name must be a string, but found ${typeof op} instead. If you wanted a literal array, use [\"literal\", [...]].`, 0);\n                return null;\n            }\n\n            const Expr = this.registry[op];\n            if (Expr) {\n                let parsed = Expr.parse(expr, this);\n                if (!parsed) return null;\n\n                if (this.expectedType) {\n                    const expected = this.expectedType;\n                    const actual = parsed.type;\n\n                    // When we expect a number, string, boolean, or array but have a value, wrap it in an assertion.\n                    // When we expect a color or formatted string, but have a string or value, wrap it in a coercion.\n                    // Otherwise, we do static type-checking.\n                    //\n                    // These behaviors are overridable for:\n                    //   * The \"coalesce\" operator, which needs to omit type annotations.\n                    //   * String-valued properties (e.g. `text-field`), where coercion is more convenient than assertion.\n                    //\n                    if ((expected.kind === 'string' || expected.kind === 'number' || expected.kind === 'boolean' || expected.kind === 'object' || expected.kind === 'array') && actual.kind === 'value') {\n                        parsed = annotate(parsed, expected, options.typeAnnotation || 'assert');\n                    } else if ((expected.kind === 'color' || expected.kind === 'formatted') && (actual.kind === 'value' || actual.kind === 'string')) {\n                        parsed = annotate(parsed, expected, options.typeAnnotation || 'coerce');\n                    } else if (this.checkSubtype(expected, actual)) {\n                        return null;\n                    }\n                }\n\n                // If an expression's arguments are all literals, we can evaluate\n                // it immediately and replace it with a literal value in the\n                // parsed/compiled result.\n                if (!(parsed instanceof Literal) && isConstant(parsed)) {\n                    const ec = new EvaluationContext();\n                    try {\n                        parsed = new Literal(parsed.type, parsed.evaluate(ec));\n                    } catch (e) {\n                        this.error(e.message);\n                        return null;\n                    }\n                }\n\n                return parsed;\n            }\n\n            return this.error(`Unknown expression \"${op}\". If you wanted a literal array, use [\"literal\", [...]].`, 0);\n        } else if (typeof expr === 'undefined') {\n            return this.error(`'undefined' value invalid. Use null instead.`);\n        } else if (typeof expr === 'object') {\n            return this.error(`Bare objects invalid. Use [\"literal\", {...}] instead.`);\n        } else {\n            return this.error(`Expected an array, but found ${typeof expr} instead.`);\n        }\n    }\n\n    /**\n     * Returns a copy of this context suitable for parsing the subexpression at\n     * index `index`, optionally appending to 'let' binding map.\n     *\n     * Note that `errors` property, intended for collecting errors while\n     * parsing, is copied by reference rather than cloned.\n     * @private\n     */\n    concat(index: number, expectedType?: ?Type, bindings?: Array<[string, Expression]>) {\n        const path = typeof index === 'number' ? this.path.concat(index) : this.path;\n        const scope = bindings ? this.scope.concat(bindings) : this.scope;\n        return new ParsingContext(\n            this.registry,\n            path,\n            expectedType || null,\n            scope,\n            this.errors\n        );\n    }\n\n    /**\n     * Push a parsing (or type checking) error into the `this.errors`\n     * @param error The message\n     * @param keys Optionally specify the source of the error at a child\n     * of the current expression at `this.key`.\n     * @private\n     */\n    error(error: string, ...keys: Array<number>) {\n        const key = `${this.key}${keys.map(k => `[${k}]`).join('')}`;\n        this.errors.push(new ParsingError(key, error));\n    }\n\n    /**\n     * Returns null if `t` is a subtype of `expected`; otherwise returns an\n     * error message and also pushes it to `this.errors`.\n     */\n    checkSubtype(expected: Type, t: Type): ?string {\n        const error = checkSubtype(expected, t);\n        if (error) this.error(error);\n        return error;\n    }\n}\n\nexport default ParsingContext;\n\nfunction isConstant(expression: Expression) {\n    if (expression instanceof Var) {\n        return isConstant(expression.boundExpression);\n    } else if (expression instanceof CompoundExpression && expression.name === 'error') {\n        return false;\n    } else if (expression instanceof CollatorExpression) {\n        // Although the results of a Collator expression with fixed arguments\n        // generally shouldn't change between executions, we can't serialize them\n        // as constant expressions because results change based on environment.\n        return false;\n    }\n\n    const isTypeAnnotation = expression instanceof Coercion ||\n        expression instanceof Assertion;\n\n    let childrenConstant = true;\n    expression.eachChild(child => {\n        // We can _almost_ assume that if `expressions` children are constant,\n        // they would already have been evaluated to Literal values when they\n        // were parsed.  Type annotations are the exception, because they might\n        // have been inferred and added after a child was parsed.\n\n        // So we recurse into isConstant() for the children of type annotations,\n        // but otherwise simply check whether they are Literals.\n        if (isTypeAnnotation) {\n            childrenConstant = childrenConstant && isConstant(child);\n        } else {\n            childrenConstant = childrenConstant && child instanceof Literal;\n        }\n    });\n    if (!childrenConstant) {\n        return false;\n    }\n\n    return isFeatureConstant(expression) &&\n        isGlobalPropertyConstant(expression, ['zoom', 'heatmap-density', 'line-progress', 'is-supported-script']);\n}\n","// @flow\n\nimport RuntimeError from './runtime_error';\n\nimport type { Expression } from './expression';\n\nexport type Stops = Array<[number, Expression]>;\n\n/**\n * Returns the index of the last stop <= input, or 0 if it doesn't exist.\n * @private\n */\nexport function findStopLessThanOrEqualTo(stops: Array<number>, input: number) {\n    const n = stops.length;\n    let lowerIndex = 0;\n    let upperIndex = n - 1;\n    let currentIndex = 0;\n    let currentValue, upperValue;\n\n    while (lowerIndex <= upperIndex) {\n        currentIndex = Math.floor((lowerIndex + upperIndex) / 2);\n        currentValue = stops[currentIndex];\n        upperValue = stops[currentIndex + 1];\n        if (input === currentValue || input > currentValue && input < upperValue) { // Search complete\n            return currentIndex;\n        } else if (currentValue < input) {\n            lowerIndex = currentIndex + 1;\n        } else if (currentValue > input) {\n            upperIndex = currentIndex - 1;\n        } else {\n            throw new RuntimeError('Input is not a number.');\n        }\n    }\n\n    return Math.max(currentIndex - 1, 0);\n}\n","// @flow\n\nimport { NumberType } from '../types';\n\nimport { findStopLessThanOrEqualTo } from '../stops';\n\nimport type { Stops } from '../stops';\nimport type { Expression } from '../expression';\nimport type ParsingContext from '../parsing_context';\nimport type EvaluationContext from '../evaluation_context';\nimport type { Value } from '../values';\nimport type { Type } from '../types';\n\nclass Step implements Expression {\n    type: Type;\n\n    input: Expression;\n    labels: Array<number>;\n    outputs: Array<Expression>;\n\n    constructor(type: Type, input: Expression, stops: Stops) {\n        this.type = type;\n        this.input = input;\n\n        this.labels = [];\n        this.outputs = [];\n        for (const [label, expression] of stops) {\n            this.labels.push(label);\n            this.outputs.push(expression);\n        }\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext) {\n        let [ , input, ...rest] = args;\n\n        if (args.length - 1 < 4) {\n            return context.error(`Expected at least 4 arguments, but found only ${args.length - 1}.`);\n        }\n\n        if ((args.length - 1) % 2 !== 0) {\n            return context.error(`Expected an even number of arguments.`);\n        }\n\n        input = context.parse(input, 1, NumberType);\n        if (!input) return null;\n\n        const stops: Stops = [];\n\n        let outputType: Type = (null: any);\n        if (context.expectedType && context.expectedType.kind !== 'value') {\n            outputType = context.expectedType;\n        }\n\n        rest.unshift(-Infinity);\n\n        for (let i = 0; i < rest.length; i += 2) {\n            const label = rest[i];\n            const value = rest[i + 1];\n\n            const labelKey = i + 1;\n            const valueKey = i + 2;\n\n            if (typeof label !== 'number') {\n                return context.error('Input/output pairs for \"step\" expressions must be defined using literal numeric values (not computed expressions) for the input values.', labelKey);\n            }\n\n            if (stops.length && stops[stops.length - 1][0] >= label) {\n                return context.error('Input/output pairs for \"step\" expressions must be arranged with input values in strictly ascending order.', labelKey);\n            }\n\n            const parsed = context.parse(value, valueKey, outputType);\n            if (!parsed) return null;\n            outputType = outputType || parsed.type;\n            stops.push([label, parsed]);\n        }\n\n        return new Step(outputType, input, stops);\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        const labels = this.labels;\n        const outputs = this.outputs;\n\n        if (labels.length === 1) {\n            return outputs[0].evaluate(ctx);\n        }\n\n        const value = ((this.input.evaluate(ctx): any): number);\n        if (value <= labels[0]) {\n            return outputs[0].evaluate(ctx);\n        }\n\n        const stopCount = labels.length;\n        if (value >= labels[stopCount - 1]) {\n            return outputs[stopCount - 1].evaluate(ctx);\n        }\n\n        const index = findStopLessThanOrEqualTo(labels, value);\n        return outputs[index].evaluate(ctx);\n    }\n\n    eachChild(fn: (Expression) => void) {\n        fn(this.input);\n        for (const expression of this.outputs) {\n            fn(expression);\n        }\n    }\n\n    possibleOutputs(): Array<Value | void> {\n        return [].concat(...this.outputs.map((output) => output.possibleOutputs()));\n    }\n\n    serialize() {\n        const serialized = [\"step\", this.input.serialize()];\n        for (let i = 0; i < this.labels.length; i++) {\n            if (i > 0) {\n                serialized.push(this.labels[i]);\n            }\n            serialized.push(this.outputs[i].serialize());\n        }\n        return serialized;\n    }\n}\n\nexport default Step;\n","/*\n * Copyright (C) 2008 Apple Inc. All Rights Reserved.\n *\n * Redistribution and use in source and binary forms, with or without\n * modification, are permitted provided that the following conditions\n * are met:\n * 1. Redistributions of source code must retain the above copyright\n *    notice, this list of conditions and the following disclaimer.\n * 2. Redistributions in binary form must reproduce the above copyright\n *    notice, this list of conditions and the following disclaimer in the\n *    documentation and/or other materials provided with the distribution.\n *\n * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY\n * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\n * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR\n * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR\n * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,\n * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,\n * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR\n * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY\n * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n *\n * Ported from Webkit\n * http://svn.webkit.org/repository/webkit/trunk/Source/WebCore/platform/graphics/UnitBezier.h\n */\n\nmodule.exports = UnitBezier;\n\nfunction UnitBezier(p1x, p1y, p2x, p2y) {\n    // Calculate the polynomial coefficients, implicit first and last control points are (0,0) and (1,1).\n    this.cx = 3.0 * p1x;\n    this.bx = 3.0 * (p2x - p1x) - this.cx;\n    this.ax = 1.0 - this.cx - this.bx;\n\n    this.cy = 3.0 * p1y;\n    this.by = 3.0 * (p2y - p1y) - this.cy;\n    this.ay = 1.0 - this.cy - this.by;\n\n    this.p1x = p1x;\n    this.p1y = p2y;\n    this.p2x = p2x;\n    this.p2y = p2y;\n}\n\nUnitBezier.prototype.sampleCurveX = function(t) {\n    // `ax t^3 + bx t^2 + cx t' expanded using Horner's rule.\n    return ((this.ax * t + this.bx) * t + this.cx) * t;\n};\n\nUnitBezier.prototype.sampleCurveY = function(t) {\n    return ((this.ay * t + this.by) * t + this.cy) * t;\n};\n\nUnitBezier.prototype.sampleCurveDerivativeX = function(t) {\n    return (3.0 * this.ax * t + 2.0 * this.bx) * t + this.cx;\n};\n\nUnitBezier.prototype.solveCurveX = function(x, epsilon) {\n    if (typeof epsilon === 'undefined') epsilon = 1e-6;\n\n    var t0, t1, t2, x2, i;\n\n    // First try a few iterations of Newton's method -- normally very fast.\n    for (t2 = x, i = 0; i < 8; i++) {\n\n        x2 = this.sampleCurveX(t2) - x;\n        if (Math.abs(x2) < epsilon) return t2;\n\n        var d2 = this.sampleCurveDerivativeX(t2);\n        if (Math.abs(d2) < 1e-6) break;\n\n        t2 = t2 - x2 / d2;\n    }\n\n    // Fall back to the bisection method for reliability.\n    t0 = 0.0;\n    t1 = 1.0;\n    t2 = x;\n\n    if (t2 < t0) return t0;\n    if (t2 > t1) return t1;\n\n    while (t0 < t1) {\n\n        x2 = this.sampleCurveX(t2);\n        if (Math.abs(x2 - x) < epsilon) return t2;\n\n        if (x > x2) {\n            t0 = t2;\n        } else {\n            t1 = t2;\n        }\n\n        t2 = (t1 - t0) * 0.5 + t0;\n    }\n\n    // Failure.\n    return t2;\n};\n\nUnitBezier.prototype.solve = function(x, epsilon) {\n    return this.sampleCurveY(this.solveCurveX(x, epsilon));\n};\n","// @flow\n\nimport Color from './color';\n\nexport function number(a: number, b: number, t: number) {\n    return (a * (1 - t)) + (b * t);\n}\n\nexport function color(from: Color, to: Color, t: number) {\n    return new Color(\n        number(from.r, to.r, t),\n        number(from.g, to.g, t),\n        number(from.b, to.b, t),\n        number(from.a, to.a, t)\n    );\n}\n\nexport function array(from: Array<number>, to: Array<number>, t: number): Array<number> {\n    return from.map((d, i) => {\n        return number(d, to[i], t);\n    });\n}\n","// @flow\n\nimport Color from './color';\n\nimport {number as interpolateNumber} from './interpolate';\n\ntype LABColor = {\n    l: number,\n    a: number,\n    b: number,\n    alpha: number\n};\n\ntype HCLColor = {\n    h: number,\n    c: number,\n    l: number,\n    alpha: number\n};\n\n// Constants\nconst Xn = 0.950470, // D65 standard referent\n    Yn = 1,\n    Zn = 1.088830,\n    t0 = 4 / 29,\n    t1 = 6 / 29,\n    t2 = 3 * t1 * t1,\n    t3 = t1 * t1 * t1,\n    deg2rad = Math.PI / 180,\n    rad2deg = 180 / Math.PI;\n\n// Utilities\nfunction xyz2lab(t) {\n    return t > t3 ? Math.pow(t, 1 / 3) : t / t2 + t0;\n}\n\nfunction lab2xyz(t) {\n    return t > t1 ? t * t * t : t2 * (t - t0);\n}\n\nfunction xyz2rgb(x) {\n    return 255 * (x <= 0.0031308 ? 12.92 * x : 1.055 * Math.pow(x, 1 / 2.4) - 0.055);\n}\n\nfunction rgb2xyz(x) {\n    x /= 255;\n    return x <= 0.04045 ? x / 12.92 : Math.pow((x + 0.055) / 1.055, 2.4);\n}\n\n// LAB\nfunction rgbToLab(rgbColor: Color): LABColor {\n    const b = rgb2xyz(rgbColor.r),\n        a = rgb2xyz(rgbColor.g),\n        l = rgb2xyz(rgbColor.b),\n        x = xyz2lab((0.4124564 * b + 0.3575761 * a + 0.1804375 * l) / Xn),\n        y = xyz2lab((0.2126729 * b + 0.7151522 * a + 0.0721750 * l) / Yn),\n        z = xyz2lab((0.0193339 * b + 0.1191920 * a + 0.9503041 * l) / Zn);\n\n    return {\n        l: 116 * y - 16,\n        a: 500 * (x - y),\n        b: 200 * (y - z),\n        alpha: rgbColor.a\n    };\n}\n\nfunction labToRgb(labColor: LABColor): Color {\n    let y = (labColor.l + 16) / 116,\n        x = isNaN(labColor.a) ? y : y + labColor.a / 500,\n        z = isNaN(labColor.b) ? y : y - labColor.b / 200;\n    y = Yn * lab2xyz(y);\n    x = Xn * lab2xyz(x);\n    z = Zn * lab2xyz(z);\n    return new Color(\n        xyz2rgb(3.2404542 * x - 1.5371385 * y - 0.4985314 * z), // D65 -> sRGB\n        xyz2rgb(-0.9692660 * x + 1.8760108 * y + 0.0415560 * z),\n        xyz2rgb(0.0556434 * x - 0.2040259 * y + 1.0572252 * z),\n        labColor.alpha\n    );\n}\n\nfunction interpolateLab(from: LABColor, to: LABColor, t: number) {\n    return {\n        l: interpolateNumber(from.l, to.l, t),\n        a: interpolateNumber(from.a, to.a, t),\n        b: interpolateNumber(from.b, to.b, t),\n        alpha: interpolateNumber(from.alpha, to.alpha, t)\n    };\n}\n\n// HCL\nfunction rgbToHcl(rgbColor: Color): HCLColor {\n    const {l, a, b} = rgbToLab(rgbColor);\n    const h = Math.atan2(b, a) * rad2deg;\n    return {\n        h: h < 0 ? h + 360 : h,\n        c: Math.sqrt(a * a + b * b),\n        l: l,\n        alpha: rgbColor.a\n    };\n}\n\nfunction hclToRgb(hclColor: HCLColor): Color {\n    const h = hclColor.h * deg2rad,\n        c = hclColor.c,\n        l = hclColor.l;\n    return labToRgb({\n        l: l,\n        a: Math.cos(h) * c,\n        b: Math.sin(h) * c,\n        alpha: hclColor.alpha\n    });\n}\n\nfunction interpolateHue(a: number, b: number, t: number) {\n    const d = b - a;\n    return a + t * (d > 180 || d < -180 ? d - 360 * Math.round(d / 360) : d);\n}\n\nfunction interpolateHcl(from: HCLColor, to: HCLColor, t: number) {\n    return {\n        h: interpolateHue(from.h, to.h, t),\n        c: interpolateNumber(from.c, to.c, t),\n        l: interpolateNumber(from.l, to.l, t),\n        alpha: interpolateNumber(from.alpha, to.alpha, t)\n    };\n}\n\nexport const lab = {\n    forward: rgbToLab,\n    reverse: labToRgb,\n    interpolate: interpolateLab\n};\n\nexport const hcl = {\n    forward: rgbToHcl,\n    reverse: hclToRgb,\n    interpolate: interpolateHcl\n};\n","// @flow\n\nimport UnitBezier from '@mapbox/unitbezier';\n\nimport * as interpolate from '../../util/interpolate';\nimport { toString, NumberType, ColorType } from '../types';\nimport { findStopLessThanOrEqualTo } from '../stops';\nimport { hcl, lab } from '../../util/color_spaces';\n\nimport type { Stops } from '../stops';\nimport type { Expression } from '../expression';\nimport type ParsingContext from '../parsing_context';\nimport type EvaluationContext from '../evaluation_context';\nimport type { Value } from '../values';\nimport type { Type } from '../types';\n\nexport type InterpolationType =\n    { name: 'linear' } |\n    { name: 'exponential', base: number } |\n    { name: 'cubic-bezier', controlPoints: [number, number, number, number] };\n\nclass Interpolate implements Expression {\n    type: Type;\n\n    operator: 'interpolate' | 'interpolate-hcl' | 'interpolate-lab';\n    interpolation: InterpolationType;\n    input: Expression;\n    labels: Array<number>;\n    outputs: Array<Expression>;\n\n    constructor(type: Type, operator: 'interpolate' | 'interpolate-hcl' | 'interpolate-lab', interpolation: InterpolationType, input: Expression, stops: Stops) {\n        this.type = type;\n        this.operator = operator;\n        this.interpolation = interpolation;\n        this.input = input;\n\n        this.labels = [];\n        this.outputs = [];\n        for (const [label, expression] of stops) {\n            this.labels.push(label);\n            this.outputs.push(expression);\n        }\n    }\n\n    static interpolationFactor(interpolation: InterpolationType, input: number, lower: number, upper: number) {\n        let t = 0;\n        if (interpolation.name === 'exponential') {\n            t = exponentialInterpolation(input, interpolation.base, lower, upper);\n        } else if (interpolation.name === 'linear') {\n            t = exponentialInterpolation(input, 1, lower, upper);\n        } else if (interpolation.name === 'cubic-bezier') {\n            const c = interpolation.controlPoints;\n            const ub = new UnitBezier(c[0], c[1], c[2], c[3]);\n            t = ub.solve(exponentialInterpolation(input, 1, lower, upper));\n        }\n        return t;\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext) {\n        let [operator, interpolation, input, ...rest] = args;\n\n        if (!Array.isArray(interpolation) || interpolation.length === 0) {\n            return context.error(`Expected an interpolation type expression.`, 1);\n        }\n\n        if (interpolation[0] === 'linear') {\n            interpolation = { name: 'linear' };\n        } else if (interpolation[0] === 'exponential') {\n            const base = interpolation[1];\n            if (typeof base !== 'number')\n                return context.error(`Exponential interpolation requires a numeric base.`, 1, 1);\n            interpolation = {\n                name: 'exponential',\n                base\n            };\n        } else if (interpolation[0] === 'cubic-bezier') {\n            const controlPoints = interpolation.slice(1);\n            if (\n                controlPoints.length !== 4 ||\n                controlPoints.some(t => typeof t !== 'number' || t < 0 || t > 1)\n            ) {\n                return context.error('Cubic bezier interpolation requires four numeric arguments with values between 0 and 1.', 1);\n            }\n\n            interpolation = {\n                name: 'cubic-bezier',\n                controlPoints: (controlPoints: any)\n            };\n        } else {\n            return context.error(`Unknown interpolation type ${String(interpolation[0])}`, 1, 0);\n        }\n\n        if (args.length - 1 < 4) {\n            return context.error(`Expected at least 4 arguments, but found only ${args.length - 1}.`);\n        }\n\n        if ((args.length - 1) % 2 !== 0) {\n            return context.error(`Expected an even number of arguments.`);\n        }\n\n        input = context.parse(input, 2, NumberType);\n        if (!input) return null;\n\n        const stops: Stops = [];\n\n        let outputType: Type = (null: any);\n        if (operator === 'interpolate-hcl' || operator === 'interpolate-lab') {\n            outputType = ColorType;\n        } else if (context.expectedType && context.expectedType.kind !== 'value') {\n            outputType = context.expectedType;\n        }\n\n        for (let i = 0; i < rest.length; i += 2) {\n            const label = rest[i];\n            const value = rest[i + 1];\n\n            const labelKey = i + 3;\n            const valueKey = i + 4;\n\n            if (typeof label !== 'number') {\n                return context.error('Input/output pairs for \"interpolate\" expressions must be defined using literal numeric values (not computed expressions) for the input values.', labelKey);\n            }\n\n            if (stops.length && stops[stops.length - 1][0] >= label) {\n                return context.error('Input/output pairs for \"interpolate\" expressions must be arranged with input values in strictly ascending order.', labelKey);\n            }\n\n            const parsed = context.parse(value, valueKey, outputType);\n            if (!parsed) return null;\n            outputType = outputType || parsed.type;\n            stops.push([label, parsed]);\n        }\n\n        if (outputType.kind !== 'number' &&\n            outputType.kind !== 'color' &&\n            !(\n                outputType.kind === 'array' &&\n                outputType.itemType.kind === 'number' &&\n                typeof outputType.N === 'number'\n            )\n        ) {\n            return context.error(`Type ${toString(outputType)} is not interpolatable.`);\n        }\n\n        return new Interpolate(outputType, (operator: any), interpolation, input, stops);\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        const labels = this.labels;\n        const outputs = this.outputs;\n\n        if (labels.length === 1) {\n            return outputs[0].evaluate(ctx);\n        }\n\n        const value = ((this.input.evaluate(ctx): any): number);\n        if (value <= labels[0]) {\n            return outputs[0].evaluate(ctx);\n        }\n\n        const stopCount = labels.length;\n        if (value >= labels[stopCount - 1]) {\n            return outputs[stopCount - 1].evaluate(ctx);\n        }\n\n        const index = findStopLessThanOrEqualTo(labels, value);\n        const lower = labels[index];\n        const upper = labels[index + 1];\n        const t = Interpolate.interpolationFactor(this.interpolation, value, lower, upper);\n\n        const outputLower = outputs[index].evaluate(ctx);\n        const outputUpper = outputs[index + 1].evaluate(ctx);\n\n        if (this.operator === 'interpolate') {\n            return (interpolate[this.type.kind.toLowerCase()]: any)(outputLower, outputUpper, t); // eslint-disable-line import/namespace\n        } else if (this.operator === 'interpolate-hcl') {\n            return hcl.reverse(hcl.interpolate(hcl.forward(outputLower), hcl.forward(outputUpper), t));\n        } else {\n            return lab.reverse(lab.interpolate(lab.forward(outputLower), lab.forward(outputUpper), t));\n        }\n    }\n\n    eachChild(fn: (Expression) => void) {\n        fn(this.input);\n        for (const expression of this.outputs) {\n            fn(expression);\n        }\n    }\n\n    possibleOutputs(): Array<Value | void> {\n        return [].concat(...this.outputs.map((output) => output.possibleOutputs()));\n    }\n\n    serialize(): Array<mixed> {\n        let interpolation;\n        if (this.interpolation.name === 'linear') {\n            interpolation = [\"linear\"];\n        } else if (this.interpolation.name === 'exponential') {\n            if  (this.interpolation.base === 1) {\n                interpolation = [\"linear\"];\n            } else {\n                interpolation = [\"exponential\", this.interpolation.base];\n            }\n        } else {\n            interpolation = [\"cubic-bezier\" ].concat(this.interpolation.controlPoints);\n        }\n\n        const serialized = [this.operator, interpolation, this.input.serialize()];\n\n        for (let i = 0; i < this.labels.length; i++) {\n            serialized.push(\n                this.labels[i],\n                this.outputs[i].serialize()\n            );\n        }\n        return serialized;\n    }\n}\n\n/**\n * Returns a ratio that can be used to interpolate between exponential function\n * stops.\n * How it works: Two consecutive stop values define a (scaled and shifted) exponential function `f(x) = a * base^x + b`, where `base` is the user-specified base,\n * and `a` and `b` are constants affording sufficient degrees of freedom to fit\n * the function to the given stops.\n *\n * Here's a bit of algebra that lets us compute `f(x)` directly from the stop\n * values without explicitly solving for `a` and `b`:\n *\n * First stop value: `f(x0) = y0 = a * base^x0 + b`\n * Second stop value: `f(x1) = y1 = a * base^x1 + b`\n * => `y1 - y0 = a(base^x1 - base^x0)`\n * => `a = (y1 - y0)/(base^x1 - base^x0)`\n *\n * Desired value: `f(x) = y = a * base^x + b`\n * => `f(x) = y0 + a * (base^x - base^x0)`\n *\n * From the above, we can replace the `a` in `a * (base^x - base^x0)` and do a\n * little algebra:\n * ```\n * a * (base^x - base^x0) = (y1 - y0)/(base^x1 - base^x0) * (base^x - base^x0)\n *                     = (y1 - y0) * (base^x - base^x0) / (base^x1 - base^x0)\n * ```\n *\n * If we let `(base^x - base^x0) / (base^x1 base^x0)`, then we have\n * `f(x) = y0 + (y1 - y0) * ratio`.  In other words, `ratio` may be treated as\n * an interpolation factor between the two stops' output values.\n *\n * (Note: a slightly different form for `ratio`,\n * `(base^(x-x0) - 1) / (base^(x1-x0) - 1) `, is equivalent, but requires fewer\n * expensive `Math.pow()` operations.)\n *\n * @private\n*/\nfunction exponentialInterpolation(input, base, lowerValue, upperValue) {\n    const difference = upperValue - lowerValue;\n    const progress = input - lowerValue;\n\n    if (difference === 0) {\n        return 0;\n    } else if (base === 1) {\n        return progress / difference;\n    } else {\n        return (Math.pow(base, progress) - 1) / (Math.pow(base, difference) - 1);\n    }\n}\n\nexport default Interpolate;\n","// @flow\n\nimport assert from 'assert';\n\nimport { checkSubtype, ValueType } from '../types';\n\nimport type { Expression } from '../expression';\nimport type ParsingContext from '../parsing_context';\nimport type EvaluationContext from '../evaluation_context';\nimport type { Value } from '../values';\nimport type { Type } from '../types';\n\nclass Coalesce implements Expression {\n    type: Type;\n    args: Array<Expression>;\n\n    constructor(type: Type, args: Array<Expression>) {\n        this.type = type;\n        this.args = args;\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext) {\n        if (args.length < 2) {\n            return context.error(\"Expectected at least one argument.\");\n        }\n        let outputType: Type = (null: any);\n        const expectedType = context.expectedType;\n        if (expectedType && expectedType.kind !== 'value') {\n            outputType = expectedType;\n        }\n        const parsedArgs = [];\n\n        for (const arg of args.slice(1)) {\n            const parsed = context.parse(arg, 1 + parsedArgs.length, outputType, undefined, {typeAnnotation: 'omit'});\n            if (!parsed) return null;\n            outputType = outputType || parsed.type;\n            parsedArgs.push(parsed);\n        }\n        assert(outputType);\n\n        // Above, we parse arguments without inferred type annotation so that\n        // they don't produce a runtime error for `null` input, which would\n        // preempt the desired null-coalescing behavior.\n        // Thus, if any of our arguments would have needed an annotation, we\n        // need to wrap the enclosing coalesce expression with it instead.\n        const needsAnnotation = expectedType &&\n            parsedArgs.some(arg => checkSubtype(expectedType, arg.type));\n\n        return needsAnnotation ?\n            new Coalesce(ValueType, parsedArgs) :\n            new Coalesce((outputType: any), parsedArgs);\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        let result = null;\n        for (const arg of this.args) {\n            result = arg.evaluate(ctx);\n            if (result !== null) break;\n        }\n        return result;\n    }\n\n    eachChild(fn: (Expression) => void) {\n        this.args.forEach(fn);\n    }\n\n    possibleOutputs(): Array<Value | void> {\n        return [].concat(...this.args.map((arg) => arg.possibleOutputs()));\n    }\n\n    serialize() {\n        const serialized = [\"coalesce\"];\n        this.eachChild(child => { serialized.push(child.serialize()); });\n        return serialized;\n    }\n}\n\nexport default Coalesce;\n","// @flow\n\nimport type { Type } from '../types';\nimport type { Expression } from '../expression';\nimport type ParsingContext from '../parsing_context';\nimport type EvaluationContext  from '../evaluation_context';\n\nclass Let implements Expression {\n    type: Type;\n    bindings: Array<[string, Expression]>;\n    result: Expression;\n\n    constructor(bindings: Array<[string, Expression]>, result: Expression) {\n        this.type = result.type;\n        this.bindings = [].concat(bindings);\n        this.result = result;\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        return this.result.evaluate(ctx);\n    }\n\n    eachChild(fn: (Expression) => void) {\n        for (const binding of this.bindings) {\n            fn(binding[1]);\n        }\n        fn(this.result);\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext) {\n        if (args.length < 4)\n            return context.error(`Expected at least 3 arguments, but found ${args.length - 1} instead.`);\n\n        const bindings: Array<[string, Expression]> = [];\n        for (let i = 1; i < args.length - 1; i += 2) {\n            const name = args[i];\n\n            if (typeof name !== 'string') {\n                return context.error(`Expected string, but found ${typeof name} instead.`, i);\n            }\n\n            if (/[^a-zA-Z0-9_]/.test(name)) {\n                return context.error(`Variable names must contain only alphanumeric characters or '_'.`, i);\n            }\n\n            const value = context.parse(args[i + 1], i + 1);\n            if (!value) return null;\n\n            bindings.push([name, value]);\n        }\n\n        const result = context.parse(args[args.length - 1], args.length - 1, context.expectedType, bindings);\n        if (!result) return null;\n\n        return new Let(bindings, result);\n    }\n\n    possibleOutputs() {\n        return this.result.possibleOutputs();\n    }\n\n    serialize() {\n        const serialized = [\"let\"];\n        for (const [name, expr] of this.bindings) {\n            serialized.push(name, expr.serialize());\n        }\n        serialized.push(this.result.serialize());\n        return serialized;\n    }\n}\n\nexport default Let;\n","// @flow\n\nimport { array, ValueType, NumberType } from '../types';\n\nimport RuntimeError from '../runtime_error';\n\nimport type { Expression } from '../expression';\nimport type ParsingContext from '../parsing_context';\nimport type EvaluationContext from '../evaluation_context';\nimport type { Type, ArrayType } from '../types';\nimport type { Value } from '../values';\n\nclass At implements Expression {\n    type: Type;\n    index: Expression;\n    input: Expression;\n\n    constructor(type: Type, index: Expression, input: Expression) {\n        this.type = type;\n        this.index = index;\n        this.input = input;\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext) {\n        if (args.length !== 3)\n            return context.error(`Expected 2 arguments, but found ${args.length - 1} instead.`);\n\n        const index = context.parse(args[1], 1, NumberType);\n        const input = context.parse(args[2], 2, array(context.expectedType || ValueType));\n\n        if (!index || !input) return null;\n\n        const t: ArrayType = (input.type: any);\n        return new At(t.itemType, index, input);\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        const index = ((this.index.evaluate(ctx): any): number);\n        const array = ((this.input.evaluate(ctx): any): Array<Value>);\n\n        if (index < 0) {\n            throw new RuntimeError(`Array index out of bounds: ${index} < 0.`);\n        }\n\n        if (index >= array.length) {\n            throw new RuntimeError(`Array index out of bounds: ${index} > ${array.length - 1}.`);\n        }\n\n        if (index !== Math.floor(index)) {\n            throw new RuntimeError(`Array index must be an integer, but found ${index} instead.`);\n        }\n\n        return array[index];\n    }\n\n    eachChild(fn: (Expression) => void) {\n        fn(this.index);\n        fn(this.input);\n    }\n\n    possibleOutputs() {\n        return [undefined];\n    }\n\n    serialize() {\n        return [\"at\", this.index.serialize(), this.input.serialize()];\n    }\n}\n\nexport default At;\n","// @flow\n\nimport assert from 'assert';\n\nimport { typeOf } from '../values';\nimport { ValueType, type Type } from '../types';\n\nimport type { Expression } from '../expression';\nimport type ParsingContext from '../parsing_context';\nimport type EvaluationContext from '../evaluation_context';\nimport type { Value } from '../values';\n\n// Map input label values to output expression index\ntype Cases = {[number | string]: number};\n\nclass Match implements Expression {\n    type: Type;\n    inputType: Type;\n\n    input: Expression;\n    cases: Cases;\n    outputs: Array<Expression>;\n    otherwise: Expression;\n\n    constructor(inputType: Type, outputType: Type, input: Expression, cases: Cases, outputs: Array<Expression>, otherwise: Expression) {\n        this.inputType = inputType;\n        this.type = outputType;\n        this.input = input;\n        this.cases = cases;\n        this.outputs = outputs;\n        this.otherwise = otherwise;\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext) {\n        if (args.length < 5)\n            return context.error(`Expected at least 4 arguments, but found only ${args.length - 1}.`);\n        if (args.length % 2 !== 1)\n            return context.error(`Expected an even number of arguments.`);\n\n        let inputType;\n        let outputType;\n        if (context.expectedType && context.expectedType.kind !== 'value') {\n            outputType = context.expectedType;\n        }\n        const cases = {};\n        const outputs = [];\n        for (let i = 2; i < args.length - 1; i += 2) {\n            let labels = args[i];\n            const value = args[i + 1];\n\n            if (!Array.isArray(labels)) {\n                labels = [labels];\n            }\n\n            const labelContext = context.concat(i);\n            if (labels.length === 0) {\n                return labelContext.error('Expected at least one branch label.');\n            }\n\n            for (const label of labels) {\n                if (typeof label !== 'number' && typeof label !== 'string') {\n                    return labelContext.error(`Branch labels must be numbers or strings.`);\n                } else if (typeof label === 'number' && Math.abs(label) > Number.MAX_SAFE_INTEGER) {\n                    return labelContext.error(`Branch labels must be integers no larger than ${Number.MAX_SAFE_INTEGER}.`);\n\n                } else if (typeof label === 'number' && Math.floor(label) !== label) {\n                    return labelContext.error(`Numeric branch labels must be integer values.`);\n\n                } else if (!inputType) {\n                    inputType = typeOf(label);\n                } else if (labelContext.checkSubtype(inputType, typeOf(label))) {\n                    return null;\n                }\n\n                if (typeof cases[String(label)] !== 'undefined') {\n                    return labelContext.error('Branch labels must be unique.');\n                }\n\n                cases[String(label)] = outputs.length;\n            }\n\n            const result = context.parse(value, i, outputType);\n            if (!result) return null;\n            outputType = outputType || result.type;\n            outputs.push(result);\n        }\n\n        const input = context.parse(args[1], 1, ValueType);\n        if (!input) return null;\n\n        const otherwise = context.parse(args[args.length - 1], args.length - 1, outputType);\n        if (!otherwise) return null;\n\n        assert(inputType && outputType);\n\n        if (input.type.kind !== 'value' && context.concat(1).checkSubtype((inputType: any), input.type)) {\n            return null;\n        }\n\n        return new Match((inputType: any), (outputType: any), input, cases, outputs, otherwise);\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        const input = (this.input.evaluate(ctx): any);\n        const output = (typeOf(input) === this.inputType && this.outputs[this.cases[input]]) || this.otherwise;\n        return output.evaluate(ctx);\n    }\n\n    eachChild(fn: (Expression) => void) {\n        fn(this.input);\n        this.outputs.forEach(fn);\n        fn(this.otherwise);\n    }\n\n    possibleOutputs(): Array<Value | void> {\n        return []\n            .concat(...this.outputs.map((out) => out.possibleOutputs()))\n            .concat(this.otherwise.possibleOutputs());\n    }\n\n    serialize(): Array<mixed> {\n        const serialized = [\"match\", this.input.serialize()];\n\n        // Sort so serialization has an arbitrary defined order, even though\n        // branch order doesn't affect evaluation\n        const sortedLabels = Object.keys(this.cases).sort();\n\n        // Group branches by unique match expression to support condensed\n        // serializations of the form [case1, case2, ...] -> matchExpression\n        const groupedByOutput: Array<[number, Array<number | string>]> = [];\n        const outputLookup: {[index: number]: number} = {}; // lookup index into groupedByOutput for a given output expression\n        for (const label of sortedLabels) {\n            const outputIndex = outputLookup[this.cases[label]];\n            if (outputIndex === undefined) {\n                // First time seeing this output, add it to the end of the grouped list\n                outputLookup[this.cases[label]] = groupedByOutput.length;\n                groupedByOutput.push([this.cases[label], [label]]);\n            } else {\n                // We've seen this expression before, add the label to that output's group\n                groupedByOutput[outputIndex][1].push(label);\n            }\n        }\n\n        const coerceLabel = (label) => this.inputType.kind === 'number' ? Number(label) : label;\n\n        for (const [outputIndex, labels] of groupedByOutput) {\n            if (labels.length === 1) {\n                // Only a single label matches this output expression\n                serialized.push(coerceLabel(labels[0]));\n            } else {\n                // Array of literal labels pointing to this output expression\n                serialized.push(labels.map(coerceLabel));\n            }\n            serialized.push(this.outputs[outputIndex].serialize());\n        }\n        serialized.push(this.otherwise.serialize());\n        return serialized;\n    }\n}\n\nexport default Match;\n","// @flow\n\nimport assert from 'assert';\n\nimport { BooleanType } from '../types';\n\nimport type { Expression } from '../expression';\nimport type ParsingContext from '../parsing_context';\nimport type EvaluationContext from '../evaluation_context';\nimport type { Value } from '../values';\nimport type { Type } from '../types';\n\ntype Branches = Array<[Expression, Expression]>;\n\nclass Case implements Expression {\n    type: Type;\n\n    branches: Branches;\n    otherwise: Expression;\n\n    constructor(type: Type, branches: Branches, otherwise: Expression) {\n        this.type = type;\n        this.branches = branches;\n        this.otherwise = otherwise;\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext) {\n        if (args.length < 4)\n            return context.error(`Expected at least 3 arguments, but found only ${args.length - 1}.`);\n        if (args.length % 2 !== 0)\n            return context.error(`Expected an odd number of arguments.`);\n\n        let outputType: ?Type;\n        if (context.expectedType && context.expectedType.kind !== 'value') {\n            outputType = context.expectedType;\n        }\n\n        const branches = [];\n        for (let i = 1; i < args.length - 1; i += 2) {\n            const test = context.parse(args[i], i, BooleanType);\n            if (!test) return null;\n\n            const result = context.parse(args[i + 1], i + 1, outputType);\n            if (!result) return null;\n\n            branches.push([test, result]);\n\n            outputType = outputType || result.type;\n        }\n\n        const otherwise = context.parse(args[args.length - 1], args.length - 1, outputType);\n        if (!otherwise) return null;\n\n        assert(outputType);\n        return new Case((outputType: any), branches, otherwise);\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        for (const [test, expression] of this.branches) {\n            if (test.evaluate(ctx)) {\n                return expression.evaluate(ctx);\n            }\n        }\n        return this.otherwise.evaluate(ctx);\n    }\n\n    eachChild(fn: (Expression) => void) {\n        for (const [test, expression] of this.branches) {\n            fn(test);\n            fn(expression);\n        }\n        fn(this.otherwise);\n    }\n\n    possibleOutputs(): Array<Value | void> {\n        return []\n            .concat(...this.branches.map(([_, out]) => out.possibleOutputs()))\n            .concat(this.otherwise.possibleOutputs());\n    }\n\n    serialize() {\n        const serialized = [\"case\"];\n        this.eachChild(child => { serialized.push(child.serialize()); });\n        return serialized;\n    }\n}\n\nexport default Case;\n","// @flow\n\nimport { toString, ValueType, BooleanType, CollatorType } from '../types';\nimport Assertion from './assertion';\nimport { typeOf } from '../values';\nimport RuntimeError from '../runtime_error';\n\nimport type { Expression } from '../expression';\nimport type EvaluationContext from '../evaluation_context';\nimport type ParsingContext from '../parsing_context';\nimport type { Type } from '../types';\n\ntype ComparisonOperator = '==' | '!=' | '<' | '>' | '<=' | '>=' ;\n\nfunction isComparableType(op: ComparisonOperator, type: Type) {\n    if (op === '==' || op === '!=') {\n        // equality operator\n        return type.kind === 'boolean' ||\n            type.kind === 'string' ||\n            type.kind === 'number' ||\n            type.kind === 'null' ||\n            type.kind === 'value';\n    } else {\n        // ordering operator\n        return type.kind === 'string' ||\n            type.kind === 'number' ||\n            type.kind === 'value';\n    }\n}\n\n\nfunction eq(ctx, a, b) { return a === b; }\nfunction neq(ctx, a, b) { return a !== b; }\nfunction lt(ctx, a, b) { return a < b; }\nfunction gt(ctx, a, b) { return a > b; }\nfunction lteq(ctx, a, b) { return a <= b; }\nfunction gteq(ctx, a, b) { return a >= b; }\n\nfunction eqCollate(ctx, a, b, c) { return c.compare(a, b) === 0; }\nfunction neqCollate(ctx, a, b, c) { return !eqCollate(ctx, a, b, c); }\nfunction ltCollate(ctx, a, b, c) { return c.compare(a, b) < 0; }\nfunction gtCollate(ctx, a, b, c) { return c.compare(a, b) > 0; }\nfunction lteqCollate(ctx, a, b, c) { return c.compare(a, b) <= 0; }\nfunction gteqCollate(ctx, a, b, c) { return c.compare(a, b) >= 0; }\n\n/**\n * Special form for comparison operators, implementing the signatures:\n * - (T, T, ?Collator) => boolean\n * - (T, value, ?Collator) => boolean\n * - (value, T, ?Collator) => boolean\n *\n * For inequalities, T must be either value, string, or number. For ==/!=, it\n * can also be boolean or null.\n *\n * Equality semantics are equivalent to Javascript's strict equality (===/!==)\n * -- i.e., when the arguments' types don't match, == evaluates to false, != to\n * true.\n *\n * When types don't match in an ordering comparison, a runtime error is thrown.\n *\n * @private\n */\nfunction makeComparison(op: ComparisonOperator, compareBasic, compareWithCollator) {\n    const isOrderComparison = op !== '==' && op !== '!=';\n\n    return class Comparison implements Expression {\n        type: Type;\n        lhs: Expression;\n        rhs: Expression;\n        collator: ?Expression;\n        hasUntypedArgument: boolean;\n\n        constructor(lhs: Expression, rhs: Expression, collator: ?Expression) {\n            this.type = BooleanType;\n            this.lhs = lhs;\n            this.rhs = rhs;\n            this.collator = collator;\n            this.hasUntypedArgument = lhs.type.kind === 'value' || rhs.type.kind === 'value';\n        }\n\n        static parse(args: Array<mixed>, context: ParsingContext): ?Expression {\n            if (args.length !== 3 && args.length !== 4)\n                return context.error(`Expected two or three arguments.`);\n\n            const op: ComparisonOperator = (args[0]: any);\n\n            let lhs = context.parse(args[1], 1, ValueType);\n            if (!lhs) return null;\n            if (!isComparableType(op, lhs.type)) {\n                return context.concat(1).error(`\"${op}\" comparisons are not supported for type '${toString(lhs.type)}'.`);\n            }\n            let rhs = context.parse(args[2], 2, ValueType);\n            if (!rhs) return null;\n            if (!isComparableType(op, rhs.type)) {\n                return context.concat(2).error(`\"${op}\" comparisons are not supported for type '${toString(rhs.type)}'.`);\n            }\n\n            if (\n                lhs.type.kind !== rhs.type.kind &&\n                lhs.type.kind !== 'value' &&\n                rhs.type.kind !== 'value'\n            ) {\n                return context.error(`Cannot compare types '${toString(lhs.type)}' and '${toString(rhs.type)}'.`);\n            }\n\n            if (isOrderComparison) {\n                // typing rules specific to less/greater than operators\n                if (lhs.type.kind === 'value' && rhs.type.kind !== 'value') {\n                    // (value, T)\n                    lhs = new Assertion(rhs.type, [lhs]);\n                } else if (lhs.type.kind !== 'value' && rhs.type.kind === 'value') {\n                    // (T, value)\n                    rhs = new Assertion(lhs.type, [rhs]);\n                }\n            }\n\n            let collator = null;\n            if (args.length === 4) {\n                if (\n                    lhs.type.kind !== 'string' &&\n                    rhs.type.kind !== 'string' &&\n                    lhs.type.kind !== 'value' &&\n                    rhs.type.kind !== 'value'\n                ) {\n                    return context.error(`Cannot use collator to compare non-string types.`);\n                }\n                collator = context.parse(args[3], 3, CollatorType);\n                if (!collator) return null;\n            }\n\n            return new Comparison(lhs, rhs, collator);\n        }\n\n        evaluate(ctx: EvaluationContext) {\n            const lhs = this.lhs.evaluate(ctx);\n            const rhs = this.rhs.evaluate(ctx);\n\n            if (isOrderComparison && this.hasUntypedArgument) {\n                const lt = typeOf(lhs);\n                const rt = typeOf(rhs);\n                // check that type is string or number, and equal\n                if (lt.kind !== rt.kind || !(lt.kind === 'string' || lt.kind === 'number')) {\n                    throw new RuntimeError(`Expected arguments for \"${op}\" to be (string, string) or (number, number), but found (${lt.kind}, ${rt.kind}) instead.`);\n                }\n            }\n\n            if (this.collator && !isOrderComparison && this.hasUntypedArgument) {\n                const lt = typeOf(lhs);\n                const rt = typeOf(rhs);\n                if (lt.kind !== 'string' || rt.kind !== 'string') {\n                    return compareBasic(ctx, lhs, rhs);\n                }\n            }\n\n            return this.collator ?\n                compareWithCollator(ctx, lhs, rhs, this.collator.evaluate(ctx)) :\n                compareBasic(ctx, lhs, rhs);\n        }\n\n        eachChild(fn: (Expression) => void) {\n            fn(this.lhs);\n            fn(this.rhs);\n            if (this.collator) {\n                fn(this.collator);\n            }\n        }\n\n        possibleOutputs() {\n            return [true, false];\n        }\n\n        serialize() {\n            const serialized = [op];\n            this.eachChild(child => { serialized.push(child.serialize()); });\n            return serialized;\n        }\n    };\n}\n\nexport const Equals = makeComparison('==', eq, eqCollate);\nexport const NotEquals = makeComparison('!=', neq, neqCollate);\nexport const LessThan = makeComparison('<', lt, ltCollate);\nexport const GreaterThan = makeComparison('>', gt, gtCollate);\nexport const LessThanOrEqual = makeComparison('<=', lteq, lteqCollate);\nexport const GreaterThanOrEqual = makeComparison('>=', gteq, gteqCollate);\n","// @flow\n\nimport { NumberType, toString } from '../types';\n\nimport { typeOf } from '../values';\nimport RuntimeError from '../runtime_error';\n\nimport type { Expression } from '../expression';\nimport type ParsingContext from '../parsing_context';\nimport type EvaluationContext from '../evaluation_context';\nimport type { Type } from '../types';\n\nclass Length implements Expression {\n    type: Type;\n    input: Expression;\n\n    constructor(input: Expression) {\n        this.type = NumberType;\n        this.input = input;\n    }\n\n    static parse(args: Array<mixed>, context: ParsingContext) {\n        if (args.length !== 2)\n            return context.error(`Expected 1 argument, but found ${args.length - 1} instead.`);\n\n        const input = context.parse(args[1], 1);\n        if (!input) return null;\n\n        if (input.type.kind !== 'array' && input.type.kind !== 'string' && input.type.kind !== 'value')\n            return context.error(`Expected argument of type string or array, but found ${toString(input.type)} instead.`);\n\n        return new Length(input);\n    }\n\n    evaluate(ctx: EvaluationContext) {\n        const input = this.input.evaluate(ctx);\n        if (typeof input === 'string') {\n            return input.length;\n        } else if (Array.isArray(input)) {\n            return input.length;\n        } else {\n            throw new RuntimeError(`Expected value to be of type string or array, but found ${toString(typeOf(input))} instead.`);\n        }\n    }\n\n    eachChild(fn: (Expression) => void) {\n        fn(this.input);\n    }\n\n    possibleOutputs() {\n        return [undefined];\n    }\n\n    serialize() {\n        const serialized = [\"length\"];\n        this.eachChild(child => { serialized.push(child.serialize()); });\n        return serialized;\n    }\n}\n\nexport default Length;\n","// @flow\n\nimport {\n    type Type,\n    NumberType,\n    StringType,\n    BooleanType,\n    ColorType,\n    ObjectType,\n    ValueType,\n    ErrorType,\n    CollatorType,\n    array,\n    toString as typeToString\n} from '../types';\n\nimport { typeOf, Color, validateRGBA, toString as valueToString } from '../values';\nimport CompoundExpression from '../compound_expression';\nimport RuntimeError from '../runtime_error';\nimport Let from './let';\nimport Var from './var';\nimport Literal from './literal';\nimport Assertion from './assertion';\nimport Coercion from './coercion';\nimport At from './at';\nimport Match from './match';\nimport Case from './case';\nimport Step from './step';\nimport Interpolate from './interpolate';\nimport Coalesce from './coalesce';\nimport {\n    Equals,\n    NotEquals,\n    LessThan,\n    GreaterThan,\n    LessThanOrEqual,\n    GreaterThanOrEqual\n} from './comparison';\nimport CollatorExpression from './collator';\nimport FormatExpression from './format';\nimport Length from './length';\n\nimport type { Varargs } from '../compound_expression';\nimport type { ExpressionRegistry } from '../expression';\n\nconst expressions: ExpressionRegistry = {\n    // special forms\n    '==': Equals,\n    '!=': NotEquals,\n    '>': GreaterThan,\n    '<': LessThan,\n    '>=': GreaterThanOrEqual,\n    '<=': LessThanOrEqual,\n    'array': Assertion,\n    'at': At,\n    'boolean': Assertion,\n    'case': Case,\n    'coalesce': Coalesce,\n    'collator': CollatorExpression,\n    'format': FormatExpression,\n    'interpolate': Interpolate,\n    'interpolate-hcl': Interpolate,\n    'interpolate-lab': Interpolate,\n    'length': Length,\n    'let': Let,\n    'literal': Literal,\n    'match': Match,\n    'number': Assertion,\n    'object': Assertion,\n    'step': Step,\n    'string': Assertion,\n    'to-boolean': Coercion,\n    'to-color': Coercion,\n    'to-number': Coercion,\n    'to-string': Coercion,\n    'var': Var\n};\n\nfunction rgba(ctx, [r, g, b, a]) {\n    r = r.evaluate(ctx);\n    g = g.evaluate(ctx);\n    b = b.evaluate(ctx);\n    const alpha = a ? a.evaluate(ctx) : 1;\n    const error = validateRGBA(r, g, b, alpha);\n    if (error) throw new RuntimeError(error);\n    return new Color(r / 255 * alpha, g / 255 * alpha, b / 255 * alpha, alpha);\n}\n\nfunction has(key, obj) {\n    return key in obj;\n}\n\nfunction get(key, obj) {\n    const v = obj[key];\n    return typeof v === 'undefined' ? null : v;\n}\n\nfunction binarySearch(v, a, i, j) {\n    while (i <= j) {\n        const m = (i + j) >> 1;\n        if (a[m] === v)\n            return true;\n        if (a[m] > v)\n            j = m - 1;\n        else\n            i = m + 1;\n    }\n    return false;\n}\n\nfunction varargs(type: Type): Varargs {\n    return { type };\n}\n\nCompoundExpression.register(expressions, {\n    'error': [\n        ErrorType,\n        [StringType],\n        (ctx, [v]) => { throw new RuntimeError(v.evaluate(ctx)); }\n    ],\n    'typeof': [\n        StringType,\n        [ValueType],\n        (ctx, [v]) => typeToString(typeOf(v.evaluate(ctx)))\n    ],\n    'to-rgba': [\n        array(NumberType, 4),\n        [ColorType],\n        (ctx, [v]) => {\n            return v.evaluate(ctx).toArray();\n        }\n    ],\n    'rgb': [\n        ColorType,\n        [NumberType, NumberType, NumberType],\n        rgba\n    ],\n    'rgba': [\n        ColorType,\n        [NumberType, NumberType, NumberType, NumberType],\n        rgba\n    ],\n    'has': {\n        type: BooleanType,\n        overloads: [\n            [\n                [StringType],\n                (ctx, [key]) => has(key.evaluate(ctx), ctx.properties())\n            ], [\n                [StringType, ObjectType],\n                (ctx, [key, obj]) => has(key.evaluate(ctx), obj.evaluate(ctx))\n            ]\n        ]\n    },\n    'get': {\n        type: ValueType,\n        overloads: [\n            [\n                [StringType],\n                (ctx, [key]) => get(key.evaluate(ctx), ctx.properties())\n            ], [\n                [StringType, ObjectType],\n                (ctx, [key, obj]) => get(key.evaluate(ctx), obj.evaluate(ctx))\n            ]\n        ]\n    },\n    'feature-state': [\n        ValueType,\n        [StringType],\n        (ctx, [key]) => get(key.evaluate(ctx), ctx.featureState || {})\n    ],\n    'properties': [\n        ObjectType,\n        [],\n        (ctx) => ctx.properties()\n    ],\n    'geometry-type': [\n        StringType,\n        [],\n        (ctx) => ctx.geometryType()\n    ],\n    'id': [\n        ValueType,\n        [],\n        (ctx) => ctx.id()\n    ],\n    'zoom': [\n        NumberType,\n        [],\n        (ctx) => ctx.globals.zoom\n    ],\n    'heatmap-density': [\n        NumberType,\n        [],\n        (ctx) => ctx.globals.heatmapDensity || 0\n    ],\n    'line-progress': [\n        NumberType,\n        [],\n        (ctx) => ctx.globals.lineProgress || 0\n    ],\n    '+': [\n        NumberType,\n        varargs(NumberType),\n        (ctx, args) => {\n            let result = 0;\n            for (const arg of args) {\n                result += arg.evaluate(ctx);\n            }\n            return result;\n        }\n    ],\n    '*': [\n        NumberType,\n        varargs(NumberType),\n        (ctx, args) => {\n            let result = 1;\n            for (const arg of args) {\n                result *= arg.evaluate(ctx);\n            }\n            return result;\n        }\n    ],\n    '-': {\n        type: NumberType,\n        overloads: [\n            [\n                [NumberType, NumberType],\n                (ctx, [a, b]) => a.evaluate(ctx) - b.evaluate(ctx)\n            ], [\n                [NumberType],\n                (ctx, [a]) => -a.evaluate(ctx)\n            ]\n        ]\n    },\n    '/': [\n        NumberType,\n        [NumberType, NumberType],\n        (ctx, [a, b]) => a.evaluate(ctx) / b.evaluate(ctx)\n    ],\n    '%': [\n        NumberType,\n        [NumberType, NumberType],\n        (ctx, [a, b]) => a.evaluate(ctx) % b.evaluate(ctx)\n    ],\n    'ln2': [\n        NumberType,\n        [],\n        () => Math.LN2\n    ],\n    'pi': [\n        NumberType,\n        [],\n        () => Math.PI\n    ],\n    'e': [\n        NumberType,\n        [],\n        () => Math.E\n    ],\n    '^': [\n        NumberType,\n        [NumberType, NumberType],\n        (ctx, [b, e]) => Math.pow(b.evaluate(ctx), e.evaluate(ctx))\n    ],\n    'sqrt': [\n        NumberType,\n        [NumberType],\n        (ctx, [x]) => Math.sqrt(x.evaluate(ctx))\n    ],\n    'log10': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => Math.log(n.evaluate(ctx)) / Math.LN10\n    ],\n    'ln': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => Math.log(n.evaluate(ctx))\n    ],\n    'log2': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => Math.log(n.evaluate(ctx)) / Math.LN2\n    ],\n    'sin': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => Math.sin(n.evaluate(ctx))\n    ],\n    'cos': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => Math.cos(n.evaluate(ctx))\n    ],\n    'tan': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => Math.tan(n.evaluate(ctx))\n    ],\n    'asin': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => Math.asin(n.evaluate(ctx))\n    ],\n    'acos': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => Math.acos(n.evaluate(ctx))\n    ],\n    'atan': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => Math.atan(n.evaluate(ctx))\n    ],\n    'min': [\n        NumberType,\n        varargs(NumberType),\n        (ctx, args) => Math.min(...args.map(arg => arg.evaluate(ctx)))\n    ],\n    'max': [\n        NumberType,\n        varargs(NumberType),\n        (ctx, args) => Math.max(...args.map(arg => arg.evaluate(ctx)))\n    ],\n    'abs': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => Math.abs(n.evaluate(ctx))\n    ],\n    'round': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => {\n            const v = n.evaluate(ctx);\n            // Javascript's Math.round() rounds towards +Infinity for halfway\n            // values, even when they're negative. It's more common to round\n            // away from 0 (e.g., this is what python and C++ do)\n            return v < 0 ? -Math.round(-v) : Math.round(v);\n        }\n    ],\n    'floor': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => Math.floor(n.evaluate(ctx))\n    ],\n    'ceil': [\n        NumberType,\n        [NumberType],\n        (ctx, [n]) => Math.ceil(n.evaluate(ctx))\n    ],\n    'filter-==': [\n        BooleanType,\n        [StringType, ValueType],\n        (ctx, [k, v]) => ctx.properties()[(k: any).value] === (v: any).value\n    ],\n    'filter-id-==': [\n        BooleanType,\n        [ValueType],\n        (ctx, [v]) => ctx.id() === (v: any).value\n    ],\n    'filter-type-==': [\n        BooleanType,\n        [StringType],\n        (ctx, [v]) => ctx.geometryType() === (v: any).value\n    ],\n    'filter-<': [\n        BooleanType,\n        [StringType, ValueType],\n        (ctx, [k, v]) => {\n            const a = ctx.properties()[(k: any).value];\n            const b = (v: any).value;\n            return typeof a === typeof b && a < b;\n        }\n    ],\n    'filter-id-<': [\n        BooleanType,\n        [ValueType],\n        (ctx, [v]) => {\n            const a = ctx.id();\n            const b = (v: any).value;\n            return typeof a === typeof b && a < b;\n        }\n    ],\n    'filter->': [\n        BooleanType,\n        [StringType, ValueType],\n        (ctx, [k, v]) => {\n            const a = ctx.properties()[(k: any).value];\n            const b = (v: any).value;\n            return typeof a === typeof b && a > b;\n        }\n    ],\n    'filter-id->': [\n        BooleanType,\n        [ValueType],\n        (ctx, [v]) => {\n            const a = ctx.id();\n            const b = (v: any).value;\n            return typeof a === typeof b && a > b;\n        }\n    ],\n    'filter-<=': [\n        BooleanType,\n        [StringType, ValueType],\n        (ctx, [k, v]) => {\n            const a = ctx.properties()[(k: any).value];\n            const b = (v: any).value;\n            return typeof a === typeof b && a <= b;\n        }\n    ],\n    'filter-id-<=': [\n        BooleanType,\n        [ValueType],\n        (ctx, [v]) => {\n            const a = ctx.id();\n            const b = (v: any).value;\n            return typeof a === typeof b && a <= b;\n        }\n    ],\n    'filter->=': [\n        BooleanType,\n        [StringType, ValueType],\n        (ctx, [k, v]) => {\n            const a = ctx.properties()[(k: any).value];\n            const b = (v: any).value;\n            return typeof a === typeof b && a >= b;\n        }\n    ],\n    'filter-id->=': [\n        BooleanType,\n        [ValueType],\n        (ctx, [v]) => {\n            const a = ctx.id();\n            const b = (v: any).value;\n            return typeof a === typeof b && a >= b;\n        }\n    ],\n    'filter-has': [\n        BooleanType,\n        [ValueType],\n        (ctx, [k]) => (k: any).value in ctx.properties()\n    ],\n    'filter-has-id': [\n        BooleanType,\n        [],\n        (ctx) => ctx.id() !== null\n    ],\n    'filter-type-in': [\n        BooleanType,\n        [array(StringType)],\n        (ctx, [v]) => (v: any).value.indexOf(ctx.geometryType()) >= 0\n    ],\n    'filter-id-in': [\n        BooleanType,\n        [array(ValueType)],\n        (ctx, [v]) => (v: any).value.indexOf(ctx.id()) >= 0\n    ],\n    'filter-in-small': [\n        BooleanType,\n        [StringType, array(ValueType)],\n        // assumes v is an array literal\n        (ctx, [k, v]) => (v: any).value.indexOf(ctx.properties()[(k: any).value]) >= 0\n    ],\n    'filter-in-large': [\n        BooleanType,\n        [StringType, array(ValueType)],\n        // assumes v is a array literal with values sorted in ascending order and of a single type\n        (ctx, [k, v]) => binarySearch(ctx.properties()[(k: any).value], (v: any).value, 0, (v: any).value.length - 1)\n    ],\n    'all': {\n        type: BooleanType,\n        overloads: [\n            [\n                [BooleanType, BooleanType],\n                (ctx, [a, b]) => a.evaluate(ctx) && b.evaluate(ctx)\n            ],\n            [\n                varargs(BooleanType),\n                (ctx, args) => {\n                    for (const arg of args) {\n                        if (!arg.evaluate(ctx))\n                            return false;\n                    }\n                    return true;\n                }\n            ]\n        ]\n    },\n    'any': {\n        type: BooleanType,\n        overloads: [\n            [\n                [BooleanType, BooleanType],\n                (ctx, [a, b]) => a.evaluate(ctx) || b.evaluate(ctx)\n            ],\n            [\n                varargs(BooleanType),\n                (ctx, args) => {\n                    for (const arg of args) {\n                        if (arg.evaluate(ctx))\n                            return true;\n                    }\n                    return false;\n                }\n            ]\n        ]\n    },\n    '!': [\n        BooleanType,\n        [BooleanType],\n        (ctx, [b]) => !b.evaluate(ctx)\n    ],\n    'is-supported-script': [\n        BooleanType,\n        [StringType],\n        // At parse time this will always return true, so we need to exclude this expression with isGlobalPropertyConstant\n        (ctx, [s]) => {\n            const isSupportedScript = ctx.globals && ctx.globals.isSupportedScript;\n            if (isSupportedScript) {\n                return isSupportedScript(s.evaluate(ctx));\n            }\n            return true;\n        }\n    ],\n    'upcase': [\n        StringType,\n        [StringType],\n        (ctx, [s]) => s.evaluate(ctx).toUpperCase()\n    ],\n    'downcase': [\n        StringType,\n        [StringType],\n        (ctx, [s]) => s.evaluate(ctx).toLowerCase()\n    ],\n    'concat': [\n        StringType,\n        varargs(ValueType),\n        (ctx, args) => args.map(arg => valueToString(arg.evaluate(ctx))).join('')\n    ],\n    'resolved-locale': [\n        StringType,\n        [CollatorType],\n        (ctx, [collator]) => collator.evaluate(ctx).resolvedLocale()\n    ]\n});\n\nexport default expressions;\n","// @flow\n\n/**\n * A type used for returning and propagating errors. The first element of the union\n * represents success and contains a value, and the second represents an error and\n * contains an error value.\n * @private\n */\nexport type Result<T, E> =\n    | {| result: 'success', value: T |}\n    | {| result: 'error', value: E |};\n\nexport function success<T, E>(value: T): Result<T, E> {\n    return { result: 'success', value };\n}\n\nexport function error<T, E>(value: E): Result<T, E> {\n    return { result: 'error', value };\n}\n","// @flow\n\nimport type {StylePropertySpecification} from '../style-spec';\n\nexport function supportsPropertyExpression(spec: StylePropertySpecification): boolean {\n    return spec['property-type'] === 'data-driven' || spec['property-type'] === 'cross-faded-data-driven';\n}\n\nexport function supportsZoomExpression(spec: StylePropertySpecification): boolean {\n    return !!spec.expression && spec.expression.parameters.indexOf('zoom') > -1;\n}\n\nexport function supportsInterpolation(spec: StylePropertySpecification): boolean {\n    return !!spec.expression && spec.expression.interpolated;\n}\n","\nexport default function getType(val) {\n    if (val instanceof Number) {\n        return 'number';\n    } else if (val instanceof String) {\n        return 'string';\n    } else if (val instanceof Boolean) {\n        return 'boolean';\n    } else if (Array.isArray(val)) {\n        return 'array';\n    } else if (val === null) {\n        return 'null';\n    } else {\n        return typeof val;\n    }\n}\n","\nimport * as colorSpaces from '../util/color_spaces';\nimport Color from '../util/color';\nimport extend from '../util/extend';\nimport getType from '../util/get_type';\nimport * as interpolate from '../util/interpolate';\nimport Interpolate from '../expression/definitions/interpolate';\nimport Formatted from '../expression/types/formatted';\nimport { supportsInterpolation } from '../util/properties';\n\nexport function isFunction(value) {\n    return typeof value === 'object' && value !== null && !Array.isArray(value);\n}\n\nfunction identityFunction(x) {\n    return x;\n}\n\nexport function createFunction(parameters, propertySpec) {\n    const isColor = propertySpec.type === 'color';\n    const zoomAndFeatureDependent = parameters.stops && typeof parameters.stops[0][0] === 'object';\n    const featureDependent = zoomAndFeatureDependent || parameters.property !== undefined;\n    const zoomDependent = zoomAndFeatureDependent || !featureDependent;\n    const type = parameters.type || (supportsInterpolation(propertySpec) ? 'exponential' : 'interval');\n\n    if (isColor) {\n        parameters = extend({}, parameters);\n\n        if (parameters.stops) {\n            parameters.stops = parameters.stops.map((stop) => {\n                return [stop[0], Color.parse(stop[1])];\n            });\n        }\n\n        if (parameters.default) {\n            parameters.default = Color.parse(parameters.default);\n        } else {\n            parameters.default = Color.parse(propertySpec.default);\n        }\n    }\n\n    if (parameters.colorSpace && parameters.colorSpace !== 'rgb' && !colorSpaces[parameters.colorSpace]) { // eslint-disable-line import/namespace\n        throw new Error(`Unknown color space: ${parameters.colorSpace}`);\n    }\n\n    let innerFun;\n    let hashedStops;\n    let categoricalKeyType;\n    if (type === 'exponential') {\n        innerFun = evaluateExponentialFunction;\n    } else if (type === 'interval') {\n        innerFun = evaluateIntervalFunction;\n    } else if (type === 'categorical') {\n        innerFun = evaluateCategoricalFunction;\n\n        // For categorical functions, generate an Object as a hashmap of the stops for fast searching\n        hashedStops = Object.create(null);\n        for (const stop of parameters.stops) {\n            hashedStops[stop[0]] = stop[1];\n        }\n\n        // Infer key type based on first stop key-- used to encforce strict type checking later\n        categoricalKeyType = typeof parameters.stops[0][0];\n\n    } else if (type === 'identity') {\n        innerFun = evaluateIdentityFunction;\n    } else {\n        throw new Error(`Unknown function type \"${type}\"`);\n    }\n\n    if (zoomAndFeatureDependent) {\n        const featureFunctions = {};\n        const zoomStops = [];\n        for (let s = 0; s < parameters.stops.length; s++) {\n            const stop = parameters.stops[s];\n            const zoom = stop[0].zoom;\n            if (featureFunctions[zoom] === undefined) {\n                featureFunctions[zoom] = {\n                    zoom: zoom,\n                    type: parameters.type,\n                    property: parameters.property,\n                    default: parameters.default,\n                    stops: []\n                };\n                zoomStops.push(zoom);\n            }\n            featureFunctions[zoom].stops.push([stop[0].value, stop[1]]);\n        }\n\n        const featureFunctionStops = [];\n        for (const z of zoomStops) {\n            featureFunctionStops.push([featureFunctions[z].zoom, createFunction(featureFunctions[z], propertySpec)]);\n        }\n\n        return {\n            kind: 'composite',\n            interpolationFactor: Interpolate.interpolationFactor.bind(undefined, {name: 'linear'}),\n            zoomStops: featureFunctionStops.map(s => s[0]),\n            evaluate({zoom}, properties) {\n                return evaluateExponentialFunction({\n                    stops: featureFunctionStops,\n                    base: parameters.base\n                }, propertySpec, zoom).evaluate(zoom, properties);\n            }\n        };\n    } else if (zoomDependent) {\n        return {\n            kind: 'camera',\n            interpolationFactor: type === 'exponential' ?\n                Interpolate.interpolationFactor.bind(undefined, {name: 'exponential', base: parameters.base !== undefined ? parameters.base : 1}) :\n                () => 0,\n            zoomStops: parameters.stops.map(s => s[0]),\n            evaluate: ({zoom}) => innerFun(parameters, propertySpec, zoom, hashedStops, categoricalKeyType)\n        };\n    } else {\n        return {\n            kind: 'source',\n            evaluate(_, feature) {\n                const value = feature && feature.properties ? feature.properties[parameters.property] : undefined;\n                if (value === undefined) {\n                    return coalesce(parameters.default, propertySpec.default);\n                }\n                return innerFun(parameters, propertySpec, value, hashedStops, categoricalKeyType);\n            }\n        };\n    }\n}\n\nfunction coalesce(a, b, c) {\n    if (a !== undefined) return a;\n    if (b !== undefined) return b;\n    if (c !== undefined) return c;\n}\n\nfunction evaluateCategoricalFunction(parameters, propertySpec, input, hashedStops, keyType) {\n    const evaluated = typeof input === keyType ? hashedStops[input] : undefined; // Enforce strict typing on input\n    return coalesce(evaluated, parameters.default, propertySpec.default);\n}\n\nfunction evaluateIntervalFunction(parameters, propertySpec, input) {\n    // Edge cases\n    if (getType(input) !== 'number') return coalesce(parameters.default, propertySpec.default);\n    const n = parameters.stops.length;\n    if (n === 1) return parameters.stops[0][1];\n    if (input <= parameters.stops[0][0]) return parameters.stops[0][1];\n    if (input >= parameters.stops[n - 1][0]) return parameters.stops[n - 1][1];\n\n    const index = findStopLessThanOrEqualTo(parameters.stops, input);\n\n    return parameters.stops[index][1];\n}\n\nfunction evaluateExponentialFunction(parameters, propertySpec, input) {\n    const base = parameters.base !== undefined ? parameters.base : 1;\n\n    // Edge cases\n    if (getType(input) !== 'number') return coalesce(parameters.default, propertySpec.default);\n    const n = parameters.stops.length;\n    if (n === 1) return parameters.stops[0][1];\n    if (input <= parameters.stops[0][0]) return parameters.stops[0][1];\n    if (input >= parameters.stops[n - 1][0]) return parameters.stops[n - 1][1];\n\n    const index = findStopLessThanOrEqualTo(parameters.stops, input);\n    const t = interpolationFactor(\n        input, base,\n        parameters.stops[index][0],\n        parameters.stops[index + 1][0]);\n\n    const outputLower = parameters.stops[index][1];\n    const outputUpper = parameters.stops[index + 1][1];\n    let interp = interpolate[propertySpec.type] || identityFunction; // eslint-disable-line import/namespace\n\n    if (parameters.colorSpace && parameters.colorSpace !== 'rgb') {\n        const colorspace = colorSpaces[parameters.colorSpace]; // eslint-disable-line import/namespace\n        interp = (a, b) => colorspace.reverse(colorspace.interpolate(colorspace.forward(a), colorspace.forward(b), t));\n    }\n\n    if (typeof outputLower.evaluate === 'function') {\n        return {\n            evaluate(...args) {\n                const evaluatedLower = outputLower.evaluate.apply(undefined, args);\n                const evaluatedUpper = outputUpper.evaluate.apply(undefined, args);\n                // Special case for fill-outline-color, which has no spec default.\n                if (evaluatedLower === undefined || evaluatedUpper === undefined) {\n                    return undefined;\n                }\n                return interp(evaluatedLower, evaluatedUpper, t);\n            }\n        };\n    }\n\n    return interp(outputLower, outputUpper, t);\n}\n\nfunction evaluateIdentityFunction(parameters, propertySpec, input) {\n    if (propertySpec.type === 'color') {\n        input = Color.parse(input);\n    } else if (propertySpec.type === 'formatted') {\n        input = Formatted.fromString(input.toString());\n    } else if (getType(input) !== propertySpec.type && (propertySpec.type !== 'enum' || !propertySpec.values[input])) {\n        input = undefined;\n    }\n    return coalesce(input, parameters.default, propertySpec.default);\n}\n\n/**\n * Returns the index of the last stop <= input, or 0 if it doesn't exist.\n *\n * @private\n */\nfunction findStopLessThanOrEqualTo(stops, input) {\n    const n = stops.length;\n    let lowerIndex = 0;\n    let upperIndex = n - 1;\n    let currentIndex = 0;\n    let currentValue, upperValue;\n\n    while (lowerIndex <= upperIndex) {\n        currentIndex = Math.floor((lowerIndex + upperIndex) / 2);\n        currentValue = stops[currentIndex][0];\n        upperValue = stops[currentIndex + 1][0];\n        if (input === currentValue || input > currentValue && input < upperValue) { // Search complete\n            return currentIndex;\n        } else if (currentValue < input) {\n            lowerIndex = currentIndex + 1;\n        } else if (currentValue > input) {\n            upperIndex = currentIndex - 1;\n        }\n    }\n\n    return Math.max(currentIndex - 1, 0);\n}\n\n/**\n * Returns a ratio that can be used to interpolate between exponential function\n * stops.\n *\n * How it works:\n * Two consecutive stop values define a (scaled and shifted) exponential\n * function `f(x) = a * base^x + b`, where `base` is the user-specified base,\n * and `a` and `b` are constants affording sufficient degrees of freedom to fit\n * the function to the given stops.\n *\n * Here's a bit of algebra that lets us compute `f(x)` directly from the stop\n * values without explicitly solving for `a` and `b`:\n *\n * First stop value: `f(x0) = y0 = a * base^x0 + b`\n * Second stop value: `f(x1) = y1 = a * base^x1 + b`\n * => `y1 - y0 = a(base^x1 - base^x0)`\n * => `a = (y1 - y0)/(base^x1 - base^x0)`\n *\n * Desired value: `f(x) = y = a * base^x + b`\n * => `f(x) = y0 + a * (base^x - base^x0)`\n *\n * From the above, we can replace the `a` in `a * (base^x - base^x0)` and do a\n * little algebra:\n * ```\n * a * (base^x - base^x0) = (y1 - y0)/(base^x1 - base^x0) * (base^x - base^x0)\n *                     = (y1 - y0) * (base^x - base^x0) / (base^x1 - base^x0)\n * ```\n *\n * If we let `(base^x - base^x0) / (base^x1 base^x0)`, then we have\n * `f(x) = y0 + (y1 - y0) * ratio`.  In other words, `ratio` may be treated as\n * an interpolation factor between the two stops' output values.\n *\n * (Note: a slightly different form for `ratio`,\n * `(base^(x-x0) - 1) / (base^(x1-x0) - 1) `, is equivalent, but requires fewer\n * expensive `Math.pow()` operations.)\n *\n * @private\n */\nfunction interpolationFactor(input, base, lowerValue, upperValue) {\n    const difference = upperValue - lowerValue;\n    const progress = input - lowerValue;\n\n    if (difference === 0) {\n        return 0;\n    } else if (base === 1) {\n        return progress / difference;\n    } else {\n        return (Math.pow(base, progress) - 1) / (Math.pow(base, difference) - 1);\n    }\n}\n","// @flow\n\nimport assert from 'assert';\n\nimport extend from '../util/extend';\nimport ParsingError from './parsing_error';\nimport ParsingContext from './parsing_context';\nimport EvaluationContext from './evaluation_context';\nimport CompoundExpression from './compound_expression';\nimport Step from './definitions/step';\nimport Interpolate from './definitions/interpolate';\nimport Coalesce from './definitions/coalesce';\nimport Let from './definitions/let';\nimport definitions from './definitions';\nimport * as isConstant from './is_constant';\nimport RuntimeError from './runtime_error';\nimport { success, error } from '../util/result';\nimport { supportsPropertyExpression, supportsZoomExpression, supportsInterpolation } from '../util/properties';\n\nimport type {Type} from './types';\nimport type {Value} from './values';\nimport type {Expression} from './expression';\nimport type {StylePropertySpecification} from '../style-spec';\nimport type {Result} from '../util/result';\nimport type {InterpolationType} from './definitions/interpolate';\nimport type {PropertyValueSpecification} from '../types';\n\nexport type Feature = {\n    +type: 1 | 2 | 3 | 'Unknown' | 'Point' | 'MultiPoint' | 'LineString' | 'MultiLineString' | 'Polygon' | 'MultiPolygon',\n    +id?: any,\n    +properties: {[string]: any},\n    +patterns?: {[string]: {\"min\": string, \"mid\": string, \"max\": string}}\n};\n\nexport type FeatureState = {[string]: any};\n\nexport type GlobalProperties = $ReadOnly<{\n    zoom: number,\n    heatmapDensity?: number,\n    lineProgress?: number,\n    isSupportedScript?: (string) => boolean\n}>;\n\nexport class StyleExpression {\n    expression: Expression;\n\n    _evaluator: EvaluationContext;\n    _defaultValue: Value;\n    _warningHistory: {[key: string]: boolean};\n    _enumValues: ?{[string]: any};\n\n    constructor(expression: Expression, propertySpec: StylePropertySpecification) {\n        this.expression = expression;\n        this._warningHistory = {};\n        this._evaluator = new EvaluationContext();\n        this._defaultValue = getDefaultValue(propertySpec);\n        this._enumValues = propertySpec.type === 'enum' ? propertySpec.values : null;\n    }\n\n    evaluateWithoutErrorHandling(globals: GlobalProperties, feature?: Feature, featureState?: FeatureState): any {\n        this._evaluator.globals = globals;\n        this._evaluator.feature = feature;\n        this._evaluator.featureState = featureState;\n\n        return this.expression.evaluate(this._evaluator);\n    }\n\n    evaluate(globals: GlobalProperties, feature?: Feature, featureState?: FeatureState): any {\n        this._evaluator.globals = globals;\n        this._evaluator.feature = feature || null;\n        this._evaluator.featureState = featureState || null;\n\n        try {\n            const val = this.expression.evaluate(this._evaluator);\n            if (val === null || val === undefined) {\n                return this._defaultValue;\n            }\n            if (this._enumValues && !(val in this._enumValues)) {\n                throw new RuntimeError(`Expected value to be one of ${Object.keys(this._enumValues).map(v => JSON.stringify(v)).join(', ')}, but found ${JSON.stringify(val)} instead.`);\n            }\n            return val;\n        } catch (e) {\n            if (!this._warningHistory[e.message]) {\n                this._warningHistory[e.message] = true;\n                if (typeof console !== 'undefined') {\n                    console.warn(e.message);\n                }\n            }\n            return this._defaultValue;\n        }\n    }\n}\n\nexport function isExpression(expression: mixed) {\n    return Array.isArray(expression) && expression.length > 0 &&\n        typeof expression[0] === 'string' && expression[0] in definitions;\n}\n\n/**\n * Parse and typecheck the given style spec JSON expression.  If\n * options.defaultValue is provided, then the resulting StyleExpression's\n * `evaluate()` method will handle errors by logging a warning (once per\n * message) and returning the default value.  Otherwise, it will throw\n * evaluation errors.\n *\n * @private\n */\nexport function createExpression(expression: mixed, propertySpec: StylePropertySpecification): Result<StyleExpression, Array<ParsingError>> {\n    const parser = new ParsingContext(definitions, [], getExpectedType(propertySpec));\n\n    // For string-valued properties, coerce to string at the top level rather than asserting.\n    const parsed = parser.parse(expression, undefined, undefined, undefined,\n        propertySpec.type === 'string' ? {typeAnnotation: 'coerce'} : undefined);\n\n    if (!parsed) {\n        assert(parser.errors.length > 0);\n        return error(parser.errors);\n    }\n\n    return success(new StyleExpression(parsed, propertySpec));\n}\n\nexport class ZoomConstantExpression<Kind> {\n    kind: Kind;\n    isStateDependent: boolean;\n    _styleExpression: StyleExpression;\n\n    constructor(kind: Kind, expression: StyleExpression) {\n        this.kind = kind;\n        this._styleExpression = expression;\n        this.isStateDependent = kind !== 'constant' && !isConstant.isStateConstant(expression.expression);\n    }\n\n    evaluateWithoutErrorHandling(globals: GlobalProperties, feature?: Feature, featureState?: FeatureState): any {\n        return this._styleExpression.evaluateWithoutErrorHandling(globals, feature, featureState);\n    }\n\n    evaluate(globals: GlobalProperties, feature?: Feature, featureState?: FeatureState): any {\n        return this._styleExpression.evaluate(globals, feature, featureState);\n    }\n}\n\nexport class ZoomDependentExpression<Kind> {\n    kind: Kind;\n    zoomStops: Array<number>;\n    isStateDependent: boolean;\n\n    _styleExpression: StyleExpression;\n    _interpolationType: ?InterpolationType;\n\n    constructor(kind: Kind, expression: StyleExpression, zoomCurve: Step | Interpolate) {\n        this.kind = kind;\n        this.zoomStops = zoomCurve.labels;\n        this._styleExpression = expression;\n        this.isStateDependent = kind !== 'camera' && !isConstant.isStateConstant(expression.expression);\n        if (zoomCurve instanceof Interpolate) {\n            this._interpolationType = zoomCurve.interpolation;\n        }\n    }\n\n    evaluateWithoutErrorHandling(globals: GlobalProperties, feature?: Feature, featureState?: FeatureState): any {\n        return this._styleExpression.evaluateWithoutErrorHandling(globals, feature, featureState);\n    }\n\n    evaluate(globals: GlobalProperties, feature?: Feature, featureState?: FeatureState): any {\n        return this._styleExpression.evaluate(globals, feature, featureState);\n    }\n\n    interpolationFactor(input: number, lower: number, upper: number): number {\n        if (this._interpolationType) {\n            return Interpolate.interpolationFactor(this._interpolationType, input, lower, upper);\n        } else {\n            return 0;\n        }\n    }\n}\n\nexport type ConstantExpression = {\n    kind: 'constant',\n    +evaluate: (globals: GlobalProperties, feature?: Feature) => any,\n}\n\nexport type SourceExpression = {\n    kind: 'source',\n    isStateDependent: boolean,\n    +evaluate: (globals: GlobalProperties, feature?: Feature, featureState?: FeatureState) => any,\n};\n\nexport type CameraExpression = {\n    kind: 'camera',\n    +evaluate: (globals: GlobalProperties, feature?: Feature, featureState?: FeatureState) => any,\n    +interpolationFactor: (input: number, lower: number, upper: number) => number,\n    zoomStops: Array<number>\n};\n\nexport type CompositeExpression = {\n    kind: 'composite',\n    isStateDependent: boolean,\n    +evaluate: (globals: GlobalProperties, feature?: Feature, featureState?: FeatureState) => any,\n    +interpolationFactor: (input: number, lower: number, upper: number) => number,\n    zoomStops: Array<number>\n};\n\nexport type StylePropertyExpression =\n    | ConstantExpression\n    | SourceExpression\n    | CameraExpression\n    | CompositeExpression;\n\nexport function createPropertyExpression(expression: mixed, propertySpec: StylePropertySpecification): Result<StylePropertyExpression, Array<ParsingError>> {\n    expression = createExpression(expression, propertySpec);\n    if (expression.result === 'error') {\n        return expression;\n    }\n\n    const parsed = expression.value.expression;\n\n    const isFeatureConstant = isConstant.isFeatureConstant(parsed);\n    if (!isFeatureConstant && !supportsPropertyExpression(propertySpec)) {\n        return error([new ParsingError('', 'data expressions not supported')]);\n    }\n\n    const isZoomConstant = isConstant.isGlobalPropertyConstant(parsed, ['zoom']);\n    if (!isZoomConstant && !supportsZoomExpression(propertySpec)) {\n        return error([new ParsingError('', 'zoom expressions not supported')]);\n    }\n\n    const zoomCurve = findZoomCurve(parsed);\n    if (!zoomCurve && !isZoomConstant) {\n        return error([new ParsingError('', '\"zoom\" expression may only be used as input to a top-level \"step\" or \"interpolate\" expression.')]);\n    } else if (zoomCurve instanceof ParsingError) {\n        return error([zoomCurve]);\n    } else if (zoomCurve instanceof Interpolate && !supportsInterpolation(propertySpec)) {\n        return error([new ParsingError('', '\"interpolate\" expressions cannot be used with this property')]);\n    }\n\n    if (!zoomCurve) {\n        return success(isFeatureConstant ?\n            (new ZoomConstantExpression('constant', expression.value): ConstantExpression) :\n            (new ZoomConstantExpression('source', expression.value): SourceExpression));\n    }\n\n    return success(isFeatureConstant ?\n        (new ZoomDependentExpression('camera', expression.value, zoomCurve): CameraExpression) :\n        (new ZoomDependentExpression('composite', expression.value, zoomCurve): CompositeExpression));\n}\n\nimport { isFunction, createFunction } from '../function';\nimport { Color } from './values';\n\n// serialization wrapper for old-style stop functions normalized to the\n// expression interface\nexport class StylePropertyFunction<T> {\n    _parameters: PropertyValueSpecification<T>;\n    _specification: StylePropertySpecification;\n\n    kind: 'constant' | 'source' | 'camera' | 'composite';\n    evaluate: (globals: GlobalProperties, feature?: Feature) => any;\n    interpolationFactor: ?(input: number, lower: number, upper: number) => number;\n    zoomStops: ?Array<number>;\n\n    constructor(parameters: PropertyValueSpecification<T>, specification: StylePropertySpecification) {\n        this._parameters = parameters;\n        this._specification = specification;\n        extend(this, createFunction(this._parameters, this._specification));\n    }\n\n    static deserialize(serialized: {_parameters: PropertyValueSpecification<T>, _specification: StylePropertySpecification}) {\n        return ((new StylePropertyFunction(serialized._parameters, serialized._specification)): StylePropertyFunction<T>);\n    }\n\n    static serialize(input: StylePropertyFunction<T>) {\n        return {\n            _parameters: input._parameters,\n            _specification: input._specification\n        };\n    }\n}\n\nexport function normalizePropertyExpression<T>(value: PropertyValueSpecification<T>, specification: StylePropertySpecification): StylePropertyExpression {\n    if (isFunction(value)) {\n        return (new StylePropertyFunction(value, specification): any);\n\n    } else if (isExpression(value)) {\n        const expression = createPropertyExpression(value, specification);\n        if (expression.result === 'error') {\n            // this should have been caught in validation\n            throw new Error(expression.value.map(err => `${err.key}: ${err.message}`).join(', '));\n        }\n        return expression.value;\n\n    } else {\n        let constant: any = value;\n        if (typeof value === 'string' && specification.type === 'color') {\n            constant = Color.parse(value);\n        }\n        return {\n            kind: 'constant',\n            evaluate: () => constant\n        };\n    }\n}\n\n// Zoom-dependent expressions may only use [\"zoom\"] as the input to a top-level \"step\" or \"interpolate\"\n// expression (collectively referred to as a \"curve\"). The curve may be wrapped in one or more \"let\" or\n// \"coalesce\" expressions.\nfunction findZoomCurve(expression: Expression): Step | Interpolate | ParsingError | null {\n    let result = null;\n    if (expression instanceof Let) {\n        result = findZoomCurve(expression.result);\n\n    } else if (expression instanceof Coalesce) {\n        for (const arg of expression.args) {\n            result = findZoomCurve(arg);\n            if (result) {\n                break;\n            }\n        }\n\n    } else if ((expression instanceof Step || expression instanceof Interpolate) &&\n        expression.input instanceof CompoundExpression &&\n        expression.input.name === 'zoom') {\n\n        result = expression;\n    }\n\n    if (result instanceof ParsingError) {\n        return result;\n    }\n\n    expression.eachChild((child) => {\n        const childResult = findZoomCurve(child);\n        if (childResult instanceof ParsingError) {\n            result = childResult;\n        } else if (!result && childResult) {\n            result = new ParsingError('', '\"zoom\" expression may only be used as input to a top-level \"step\" or \"interpolate\" expression.');\n        } else if (result && childResult && result !== childResult) {\n            result = new ParsingError('', 'Only one zoom-based \"step\" or \"interpolate\" subexpression may be used in an expression.');\n        }\n    });\n\n    return result;\n}\n\nimport { ColorType, StringType, NumberType, BooleanType, ValueType, FormattedType, array } from './types';\n\nfunction getExpectedType(spec: StylePropertySpecification): Type {\n    const types = {\n        color: ColorType,\n        string: StringType,\n        number: NumberType,\n        enum: StringType,\n        boolean: BooleanType,\n        formatted: FormattedType\n    };\n\n    if (spec.type === 'array') {\n        return array(types[spec.value] || ValueType, spec.length);\n    }\n\n    return types[spec.type];\n}\n\nfunction getDefaultValue(spec: StylePropertySpecification): Value {\n    if (spec.type === 'color' && isFunction(spec.default)) {\n        // Special case for heatmap-color: it uses the 'default:' to define a\n        // default color ramp, but createExpression expects a simple value to fall\n        // back to in case of runtime errors\n        return new Color(0, 0, 0, 0);\n    } else if (spec.type === 'color') {\n        return Color.parse(spec.default) || null;\n    } else if (spec.default === undefined) {\n        return null;\n    } else {\n        return spec.default;\n    }\n}\n","// @flow\n\nimport assert from 'assert';\nimport type {StylePropertySpecification} from '../style-spec';\n\nexport default convertFunction;\n\nfunction convertLiteral(value) {\n    return typeof value === 'object' ? ['literal', value] : value;\n}\n\nfunction convertFunction(parameters: any, propertySpec: StylePropertySpecification) {\n    let stops = parameters.stops;\n    if (!stops) {\n        // identity function\n        return convertIdentityFunction(parameters, propertySpec);\n    }\n\n    const zoomAndFeatureDependent = stops && typeof stops[0][0] === 'object';\n    const featureDependent = zoomAndFeatureDependent || parameters.property !== undefined;\n    const zoomDependent = zoomAndFeatureDependent || !featureDependent;\n\n    stops = stops.map((stop) => {\n        if (!featureDependent && propertySpec.tokens && typeof stop[1] === 'string') {\n            return [stop[0], convertTokenString(stop[1])];\n        }\n        return [stop[0], convertLiteral(stop[1])];\n    });\n\n    if (zoomAndFeatureDependent) {\n        return convertZoomAndPropertyFunction(parameters, propertySpec, stops);\n    } else if (zoomDependent) {\n        return convertZoomFunction(parameters, propertySpec, stops);\n    } else {\n        return convertPropertyFunction(parameters, propertySpec, stops);\n    }\n}\n\nfunction convertIdentityFunction(parameters, propertySpec): Array<mixed> {\n    const get = ['get', parameters.property];\n\n    if (parameters.default === undefined) {\n        // By default, expressions for string-valued properties get coerced. To preserve\n        // legacy function semantics, insert an explicit assertion instead.\n        return propertySpec.type === 'string' ? ['string', get] : get;\n    } else if (propertySpec.type === 'enum') {\n        return [\n            'match',\n            get,\n            Object.keys(propertySpec.values),\n            get,\n            parameters.default\n        ];\n    } else {\n        const expression = [propertySpec.type === 'color' ? 'to-color' : propertySpec.type, get, convertLiteral(parameters.default)];\n        if (propertySpec.type === 'array') {\n            expression.splice(1, 0, propertySpec.value, propertySpec.length || null);\n        }\n        return expression;\n    }\n}\n\nfunction getInterpolateOperator(parameters) {\n    switch (parameters.colorSpace) {\n    case 'hcl': return 'interpolate-hcl';\n    case 'lab': return 'interpolate-lab';\n    default: return 'interpolate';\n    }\n}\n\nfunction convertZoomAndPropertyFunction(parameters, propertySpec, stops) {\n    const featureFunctionParameters = {};\n    const featureFunctionStops = {};\n    const zoomStops = [];\n    for (let s = 0; s < stops.length; s++) {\n        const stop = stops[s];\n        const zoom = stop[0].zoom;\n        if (featureFunctionParameters[zoom] === undefined) {\n            featureFunctionParameters[zoom] = {\n                zoom: zoom,\n                type: parameters.type,\n                property: parameters.property,\n                default: parameters.default,\n            };\n            featureFunctionStops[zoom] = [];\n            zoomStops.push(zoom);\n        }\n        featureFunctionStops[zoom].push([stop[0].value, stop[1]]);\n    }\n\n    // the interpolation type for the zoom dimension of a zoom-and-property\n    // function is determined directly from the style property specification\n    // for which it's being used: linear for interpolatable properties, step\n    // otherwise.\n    const functionType = getFunctionType({}, propertySpec);\n    if (functionType === 'exponential') {\n        const expression = [getInterpolateOperator(parameters), ['linear'], ['zoom']];\n\n        for (const z of zoomStops) {\n            const output = convertPropertyFunction(featureFunctionParameters[z], propertySpec, featureFunctionStops[z]);\n            appendStopPair(expression, z, output, false);\n        }\n\n        return expression;\n    } else {\n        const expression = ['step', ['zoom']];\n\n        for (const z of zoomStops) {\n            const output = convertPropertyFunction(featureFunctionParameters[z], propertySpec, featureFunctionStops[z]);\n            appendStopPair(expression, z, output, true);\n        }\n\n        fixupDegenerateStepCurve(expression);\n\n        return expression;\n    }\n}\n\nfunction coalesce(a, b) {\n    if (a !== undefined) return a;\n    if (b !== undefined) return b;\n}\n\nfunction convertPropertyFunction(parameters, propertySpec, stops) {\n    const type = getFunctionType(parameters, propertySpec);\n    const get = ['get', parameters.property];\n    if (type === 'categorical' && typeof stops[0][0] === 'boolean') {\n        assert(parameters.stops.length > 0 && parameters.stops.length <= 2);\n        const expression = ['case'];\n        for (const stop of stops) {\n            expression.push(['==', get, stop[0]], stop[1]);\n        }\n        expression.push(convertLiteral(coalesce(parameters.default, propertySpec.default)));\n        return expression;\n    } else if (type === 'categorical') {\n        const expression = ['match', get];\n        for (const stop of stops) {\n            appendStopPair(expression, stop[0], stop[1], false);\n        }\n        expression.push(convertLiteral(coalesce(parameters.default, propertySpec.default)));\n        return expression;\n    } else if (type === 'interval') {\n        const expression = ['step', ['number', get]];\n        for (const stop of stops) {\n            appendStopPair(expression, stop[0], stop[1], true);\n        }\n        fixupDegenerateStepCurve(expression);\n        return parameters.default === undefined ? expression : [\n            'case',\n            ['==', ['typeof', get], 'number'],\n            expression,\n            convertLiteral(parameters.default)\n        ];\n    } else if (type === 'exponential') {\n        const base = parameters.base !== undefined ? parameters.base : 1;\n        const expression = [getInterpolateOperator(parameters), ['exponential', base], ['number', get]];\n        for (const stop of stops) {\n            appendStopPair(expression, stop[0], stop[1], false);\n        }\n        return parameters.default === undefined ? expression : [\n            'case',\n            ['==', ['typeof', get], 'number'],\n            expression,\n            convertLiteral(parameters.default)\n        ];\n    } else {\n        throw new Error(`Unknown property function type ${type}`);\n    }\n}\n\nfunction convertZoomFunction(parameters, propertySpec, stops, input = ['zoom']) {\n    const type = getFunctionType(parameters, propertySpec);\n    let expression;\n    let isStep = false;\n    if (type === 'interval') {\n        expression = ['step', input];\n        isStep = true;\n    } else if (type === 'exponential') {\n        const base = parameters.base !== undefined ? parameters.base : 1;\n        expression = [getInterpolateOperator(parameters), ['exponential', base], input];\n    } else {\n        throw new Error(`Unknown zoom function type \"${type}\"`);\n    }\n\n    for (const stop of stops) {\n        appendStopPair(expression, stop[0], stop[1], isStep);\n    }\n\n    fixupDegenerateStepCurve(expression);\n\n    return expression;\n}\n\nfunction fixupDegenerateStepCurve(expression) {\n    // degenerate step curve (i.e. a constant function): add a noop stop\n    if (expression[0] === 'step' && expression.length === 3) {\n        expression.push(0);\n        expression.push(expression[3]);\n    }\n}\n\nfunction appendStopPair(curve, input, output, isStep) {\n    // Skip duplicate stop values. They were not validated for functions, but they are for expressions.\n    // https://github.com/mapbox/mapbox-gl-js/issues/4107\n    if (curve.length > 3 && input === curve[curve.length - 2]) {\n        return;\n    }\n    // step curves don't get the first input value, as it is redundant.\n    if (!(isStep && curve.length === 2)) {\n        curve.push(input);\n    }\n    curve.push(output);\n}\n\nfunction getFunctionType(parameters, propertySpec) {\n    if (parameters.type) {\n        return parameters.type;\n    } else {\n        assert(propertySpec.expression);\n        return (propertySpec.expression: any).interpolated ? 'exponential' : 'interval';\n    }\n}\n\n// \"String with {name} token\" => [\"concat\", \"String with \", [\"get\", \"name\"], \" token\"]\nexport function convertTokenString(s: string) {\n    const result = ['concat'];\n    const re = /{([^{}]+)}/g;\n    let pos = 0;\n    for (let match = re.exec(s); match !== null; match = re.exec(s)) {\n        const literal = s.slice(pos, re.lastIndex - match[0].length);\n        pos = re.lastIndex;\n        if (literal.length > 0) result.push(literal);\n        result.push(['get', match[1]]);\n    }\n\n    if (result.length === 1) {\n        return s;\n    }\n\n    if (pos < s.length) {\n        result.push(s.slice(pos));\n    } else if (result.length === 2) {\n        return ['to-string', result[1]];\n    }\n\n    return result;\n}\n\n","// @flow\n\nimport { createExpression } from '../expression';\n\nimport type {GlobalProperties} from '../expression';\nexport type FeatureFilter = (globalProperties: GlobalProperties, feature: VectorTileFeature) => boolean;\n\nexport default createFilter;\nexport { isExpressionFilter };\n\nfunction isExpressionFilter(filter: any) {\n    if (filter === true || filter === false) {\n        return true;\n    }\n\n    if (!Array.isArray(filter) || filter.length === 0) {\n        return false;\n    }\n    switch (filter[0]) {\n    case 'has':\n        return filter.length >= 2 && filter[1] !== '$id' && filter[1] !== '$type';\n\n    case 'in':\n    case '!in':\n    case '!has':\n    case 'none':\n        return false;\n\n    case '==':\n    case '!=':\n    case '>':\n    case '>=':\n    case '<':\n    case '<=':\n        return filter.length !== 3 || (Array.isArray(filter[1]) || Array.isArray(filter[2]));\n\n    case 'any':\n    case 'all':\n        for (const f of filter.slice(1)) {\n            if (!isExpressionFilter(f) && typeof f !== 'boolean') {\n                return false;\n            }\n        }\n        return true;\n\n    default:\n        return true;\n    }\n}\n\nconst filterSpec = {\n    'type': 'boolean',\n    'default': false,\n    'transition': false,\n    'property-type': 'data-driven',\n    'expression': {\n        'interpolated': false,\n        'parameters': ['zoom', 'feature']\n    }\n};\n\n/**\n * Given a filter expressed as nested arrays, return a new function\n * that evaluates whether a given feature (with a .properties or .tags property)\n * passes its test.\n *\n * @private\n * @param {Array} filter mapbox gl filter\n * @returns {Function} filter-evaluating function\n */\nfunction createFilter(filter: any): FeatureFilter {\n    if (filter === null || filter === undefined) {\n        return () => true;\n    }\n\n    if (!isExpressionFilter(filter)) {\n        filter = convertFilter(filter);\n    }\n\n    const compiled = createExpression(filter, filterSpec);\n    if (compiled.result === 'error') {\n        throw new Error(compiled.value.map(err => `${err.key}: ${err.message}`).join(', '));\n    } else {\n        return (globalProperties: GlobalProperties, feature: VectorTileFeature) => compiled.value.evaluate(globalProperties, feature);\n    }\n}\n\n// Comparison function to sort numbers and strings\nfunction compare(a, b) {\n    return a < b ? -1 : a > b ? 1 : 0;\n}\n\nfunction convertFilter(filter: ?Array<any>): mixed {\n    if (!filter) return true;\n    const op = filter[0];\n    if (filter.length <= 1) return (op !== 'any');\n    const converted =\n        op === '==' ? convertComparisonOp(filter[1], filter[2], '==') :\n        op === '!=' ? convertNegation(convertComparisonOp(filter[1], filter[2], '==')) :\n        op === '<' ||\n        op === '>' ||\n        op === '<=' ||\n        op === '>=' ? convertComparisonOp(filter[1], filter[2], op) :\n        op === 'any' ? convertDisjunctionOp(filter.slice(1)) :\n        op === 'all' ? ['all'].concat(filter.slice(1).map(convertFilter)) :\n        op === 'none' ? ['all'].concat(filter.slice(1).map(convertFilter).map(convertNegation)) :\n        op === 'in' ? convertInOp(filter[1], filter.slice(2)) :\n        op === '!in' ? convertNegation(convertInOp(filter[1], filter.slice(2))) :\n        op === 'has' ? convertHasOp(filter[1]) :\n        op === '!has' ? convertNegation(convertHasOp(filter[1])) :\n        true;\n    return converted;\n}\n\nfunction convertComparisonOp(property: string, value: any, op: string) {\n    switch (property) {\n    case '$type':\n        return [`filter-type-${op}`, value];\n    case '$id':\n        return [`filter-id-${op}`, value];\n    default:\n        return [`filter-${op}`, property, value];\n    }\n}\n\nfunction convertDisjunctionOp(filters: Array<Array<any>>) {\n    return ['any'].concat(filters.map(convertFilter));\n}\n\nfunction convertInOp(property: string, values: Array<any>) {\n    if (values.length === 0) { return false; }\n    switch (property) {\n    case '$type':\n        return [`filter-type-in`, ['literal', values]];\n    case '$id':\n        return [`filter-id-in`, ['literal', values]];\n    default:\n        if (values.length > 200 && !values.some(v => typeof v !== typeof values[0])) {\n            return ['filter-in-large', property, ['literal', values.sort(compare)]];\n        } else {\n            return ['filter-in-small', property, ['literal', values]];\n        }\n    }\n}\n\nfunction convertHasOp(property: string) {\n    switch (property) {\n    case '$type':\n        return true;\n    case '$id':\n        return [`filter-has-id`];\n    default:\n        return [`filter-has`, property];\n    }\n}\n\nfunction convertNegation(filter: mixed) {\n    return ['!', filter];\n}\n","// @flow\n\nimport { isExpressionFilter } from './index';\n\nimport type { FilterSpecification } from '../types';\n\ntype ExpectedTypes = {[string]: 'string' | 'number' | 'boolean'};\n\n/**\n * Convert the given legacy filter to (the JSON representation of) an\n * equivalent expression\n * @private\n */\nexport default function convertFilter(filter: FilterSpecification): mixed {\n    return _convertFilter(filter, {});\n}\n\n/*\n * Convert the given filter to an expression, storing the expected types for\n * any feature properties referenced in expectedTypes.\n *\n * These expected types are needed in order to construct preflight type checks\n * needed for handling 'any' filters. A preflight type check is necessary in\n * order to mimic legacy filters' semantics around expected type mismatches.\n * For example, consider the legacy filter:\n *\n *     [\"any\", [\"all\", [\">\", \"y\", 0], [\">\", \"y\", 0]], [\">\", \"x\", 0]]\n *\n * Naively, we might convert this to the expression:\n *\n *     [\"any\", [\"all\", [\">\", [\"get\", \"y\"], 0], [\">\", [\"get\", \"z\"], 0]], [\">\", [\"get\", \"x\"], 0]]\n *\n * But if we tried to evaluate this against, say `{x: 1, y: null, z: 0}`, the\n * [\">\", [\"get\", \"y\"], 0] would cause an evaluation error, leading to the\n * entire filter returning false. Legacy filter semantics, though, ask for\n * [\">\", \"y\", 0] to simply return `false` when `y` is of the wrong type,\n * allowing the subsequent terms of the outer \"any\" expression to be evaluated\n * (resulting, in this case, in a `true` value, because x > 0).\n *\n * We account for this by inserting a preflight type-checking expression before\n * each \"any\" term, allowing us to avoid evaluating the actual converted filter\n * if any type mismatches would cause it to produce an evalaution error:\n *\n *     [\"any\",\n *       [\"case\",\n *         [\"all\", [\"==\", [\"typeof\", [\"get\", \"y\"]], \"number\"], [\"==\", [\"typeof\", [\"get\", \"z\"], \"number]],\n *         [\"all\", [\">\", [\"get\", \"y\"], 0], [\">\", [\"get\", \"z\"], 0]],\n *         false\n *       ],\n *       [\"case\",\n *         [\"==\", [\"typeof\", [\"get\", \"x\"], \"number\"]],\n *         [\">\", [\"get\", \"x\"], 0],\n *         false\n *       ]\n *     ]\n *\n * An alternative, possibly more direct approach would be to use type checks\n * in the conversion of each comparison operator, so that the converted version\n * of each individual ==, >=, etc. would mimic the legacy filter semantics. The\n * downside of this approach is that it can lead to many more type checks than\n * would otherwise be necessary: outside the context of an \"any\" expression,\n * bailing out due to a runtime type error (expression semantics) and returning\n * false (legacy filter semantics) are equivalent: they cause the filter to\n * produce a `false` result.\n */\nfunction _convertFilter(filter: FilterSpecification, expectedTypes: ExpectedTypes): mixed {\n    if (isExpressionFilter(filter)) { return filter; }\n\n    if (!filter) return true;\n    const op = filter[0];\n    if (filter.length <= 1) return (op !== 'any');\n\n    let converted;\n\n    if (\n        op === '==' ||\n        op === '!=' ||\n        op === '<' ||\n        op === '>' ||\n        op === '<=' ||\n        op === '>='\n    ) {\n        const [, property, value] = (filter: any);\n        converted = convertComparisonOp(property, value, op, expectedTypes);\n    } else if (op === 'any') {\n        const children = (filter: any).slice(1).map(f => {\n            const types = {};\n            const child = _convertFilter(f, types);\n            const typechecks = runtimeTypeChecks(types);\n            return typechecks === true ? child : ['case', typechecks, child, false];\n        });\n        return ['any'].concat(children);\n    } else if (op === 'all') {\n        const children = (filter: any).slice(1).map(f => _convertFilter(f, expectedTypes));\n        return ['all'].concat(children);\n    } else if (op === 'none') {\n        return ['!', _convertFilter(['any'].concat(filter.slice(1)), {})];\n    } else if (op === 'in') {\n        converted = convertInOp((filter[1]: any), filter.slice(2));\n    } else if (op === '!in') {\n        converted = convertInOp((filter[1]: any), filter.slice(2), true);\n    } else if (op === 'has') {\n        converted = convertHasOp((filter[1]: any));\n    } else if (op === '!has') {\n        converted = ['!', convertHasOp((filter[1]: any))];\n    } else {\n        converted = true;\n    }\n\n    return converted;\n}\n\n// Given a set of feature properties and an expected type for each one,\n// construct an boolean expression that tests whether each property has the\n// right type.\n// E.g.: for {name: 'string', population: 'number'}, return\n// [ 'all',\n//   ['==', ['typeof', ['get', 'name'], 'string']],\n//   ['==', ['typeof', ['get', 'population'], 'number]]\n// ]\nfunction runtimeTypeChecks(expectedTypes: ExpectedTypes) {\n    const conditions = [];\n    for (const property in expectedTypes) {\n        const get = property === '$id' ? ['id'] : ['get', property];\n        conditions.push(['==', ['typeof', get], expectedTypes[property]]);\n    }\n    if (conditions.length === 0) return true;\n    if (conditions.length === 1) return conditions[0];\n    return ['all'].concat(conditions);\n}\n\nfunction convertComparisonOp(property: string, value: any, op: string, expectedTypes: ?ExpectedTypes) {\n    let get;\n    if (property === '$type') {\n        return [op, ['geometry-type'], value];\n    } else if (property === '$id') {\n        get = ['id'];\n    } else {\n        get = ['get', property];\n    }\n\n    if (expectedTypes && value !== null) {\n        const type = ((typeof value): any);\n        expectedTypes[property] = type;\n    }\n\n    if (op === '==' && property !== '$id' && value === null) {\n        return [\n            'all',\n            ['has', property], // missing property != null for legacy filters\n            ['==', get, null]\n        ];\n    } else if (op === '!=' && property !== '$id' && value === null) {\n        return [\n            'any',\n            ['!', ['has', property]], // missing property != null for legacy filters\n            ['!=', get, null]\n        ];\n    }\n\n    return [op, get, value];\n}\n\nfunction convertInOp(property: string, values: Array<any>, negate = false) {\n    if (values.length === 0) return negate;\n\n    let get;\n    if (property === '$type') {\n        get = ['geometry-type'];\n    } else if (property === '$id') {\n        get = ['id'];\n    } else {\n        get = ['get', property];\n    }\n\n    // Determine if the list of values to be searched is homogenously typed.\n    // If so (and if the type is string or number), then we can use a\n    // [match, input, [...values], true, false] construction rather than a\n    // bunch of `==` tests.\n    let uniformTypes = true;\n    const type = typeof values[0];\n    for (const value of values) {\n        if (typeof value !== type) {\n            uniformTypes = false;\n            break;\n        }\n    }\n\n    if (uniformTypes && (type === 'string' || type === 'number')) {\n        return ['match', get, values, !negate, negate];\n    }\n\n    return [ negate ? 'all' : 'any' ].concat(\n        values.map(v => [negate ? '!=' : '==', get, v])\n    );\n}\n\nfunction convertHasOp(property: string) {\n    if (property === '$type') {\n        return true;\n    } else if (property === '$id') {\n        return ['!=', ['id'], null];\n    } else {\n        return ['has', property];\n    }\n}\n","// @flow\n\n/**\n * Deeply compares two object literals.\n *\n * @private\n */\nfunction deepEqual(a: ?mixed, b: ?mixed): boolean {\n    if (Array.isArray(a)) {\n        if (!Array.isArray(b) || a.length !== b.length) return false;\n        for (let i = 0; i < a.length; i++) {\n            if (!deepEqual(a[i], b[i])) return false;\n        }\n        return true;\n    }\n    if (typeof a === 'object' && a !== null && b !== null) {\n        if (!(typeof b === 'object')) return false;\n        const keys = Object.keys(a);\n        if (keys.length !== Object.keys(b).length) return false;\n        for (const key in a) {\n            if (!deepEqual(a[key], b[key])) return false;\n        }\n        return true;\n    }\n    return a === b;\n}\n\nexport default deepEqual;\n","\nimport isEqual from './util/deep_equal';\n\nconst operations = {\n\n    /*\n     * { command: 'setStyle', args: [stylesheet] }\n     */\n    setStyle: 'setStyle',\n\n    /*\n     * { command: 'addLayer', args: [layer, 'beforeLayerId'] }\n     */\n    addLayer: 'addLayer',\n\n    /*\n     * { command: 'removeLayer', args: ['layerId'] }\n     */\n    removeLayer: 'removeLayer',\n\n    /*\n     * { command: 'setPaintProperty', args: ['layerId', 'prop', value] }\n     */\n    setPaintProperty: 'setPaintProperty',\n\n    /*\n     * { command: 'setLayoutProperty', args: ['layerId', 'prop', value] }\n     */\n    setLayoutProperty: 'setLayoutProperty',\n\n    /*\n     * { command: 'setFilter', args: ['layerId', filter] }\n     */\n    setFilter: 'setFilter',\n\n    /*\n     * { command: 'addSource', args: ['sourceId', source] }\n     */\n    addSource: 'addSource',\n\n    /*\n     * { command: 'removeSource', args: ['sourceId'] }\n     */\n    removeSource: 'removeSource',\n\n    /*\n     * { command: 'setGeoJSONSourceData', args: ['sourceId', data] }\n     */\n    setGeoJSONSourceData: 'setGeoJSONSourceData',\n\n    /*\n     * { command: 'setLayerZoomRange', args: ['layerId', 0, 22] }\n     */\n    setLayerZoomRange: 'setLayerZoomRange',\n\n    /*\n     * { command: 'setLayerProperty', args: ['layerId', 'prop', value] }\n     */\n    setLayerProperty: 'setLayerProperty',\n\n    /*\n     * { command: 'setCenter', args: [[lon, lat]] }\n     */\n    setCenter: 'setCenter',\n\n    /*\n     * { command: 'setZoom', args: [zoom] }\n     */\n    setZoom: 'setZoom',\n\n    /*\n     * { command: 'setBearing', args: [bearing] }\n     */\n    setBearing: 'setBearing',\n\n    /*\n     * { command: 'setPitch', args: [pitch] }\n     */\n    setPitch: 'setPitch',\n\n    /*\n     * { command: 'setSprite', args: ['spriteUrl'] }\n     */\n    setSprite: 'setSprite',\n\n    /*\n     * { command: 'setGlyphs', args: ['glyphsUrl'] }\n     */\n    setGlyphs: 'setGlyphs',\n\n    /*\n     * { command: 'setTransition', args: [transition] }\n     */\n    setTransition: 'setTransition',\n\n    /*\n     * { command: 'setLighting', args: [lightProperties] }\n     */\n    setLight: 'setLight'\n\n};\n\nfunction addSource(sourceId, after, commands) {\n    commands.push({ command: operations.addSource, args: [sourceId, after[sourceId]] });\n}\n\nfunction removeSource(sourceId, commands, sourcesRemoved) {\n    commands.push({ command: operations.removeSource, args: [sourceId] });\n    sourcesRemoved[sourceId] = true;\n}\n\nfunction updateSource(sourceId, after, commands, sourcesRemoved) {\n    removeSource(sourceId, commands, sourcesRemoved);\n    addSource(sourceId, after, commands);\n}\n\nfunction canUpdateGeoJSON(before, after, sourceId) {\n    let prop;\n    for (prop in before[sourceId]) {\n        if (!before[sourceId].hasOwnProperty(prop)) continue;\n        if (prop !== 'data' && !isEqual(before[sourceId][prop], after[sourceId][prop])) {\n            return false;\n        }\n    }\n    for (prop in after[sourceId]) {\n        if (!after[sourceId].hasOwnProperty(prop)) continue;\n        if (prop !== 'data' && !isEqual(before[sourceId][prop], after[sourceId][prop])) {\n            return false;\n        }\n    }\n    return true;\n}\n\nfunction diffSources(before, after, commands, sourcesRemoved) {\n    before = before || {};\n    after = after || {};\n\n    let sourceId;\n\n    // look for sources to remove\n    for (sourceId in before) {\n        if (!before.hasOwnProperty(sourceId)) continue;\n        if (!after.hasOwnProperty(sourceId)) {\n            removeSource(sourceId, commands, sourcesRemoved);\n        }\n    }\n\n    // look for sources to add/update\n    for (sourceId in after) {\n        if (!after.hasOwnProperty(sourceId)) continue;\n        if (!before.hasOwnProperty(sourceId)) {\n            addSource(sourceId, after, commands);\n        } else if (!isEqual(before[sourceId], after[sourceId])) {\n            if (before[sourceId].type === 'geojson' && after[sourceId].type === 'geojson' && canUpdateGeoJSON(before, after, sourceId)) {\n                commands.push({ command: operations.setGeoJSONSourceData, args: [sourceId, after[sourceId].data] });\n            } else {\n                // no update command, must remove then add\n                updateSource(sourceId, after, commands, sourcesRemoved);\n            }\n        }\n    }\n}\n\nfunction diffLayerPropertyChanges(before, after, commands, layerId, klass, command) {\n    before = before || {};\n    after = after || {};\n\n    let prop;\n\n    for (prop in before) {\n        if (!before.hasOwnProperty(prop)) continue;\n        if (!isEqual(before[prop], after[prop])) {\n            commands.push({ command: command, args: [layerId, prop, after[prop], klass] });\n        }\n    }\n    for (prop in after) {\n        if (!after.hasOwnProperty(prop) || before.hasOwnProperty(prop)) continue;\n        if (!isEqual(before[prop], after[prop])) {\n            commands.push({ command: command, args: [layerId, prop, after[prop], klass] });\n        }\n    }\n}\n\nfunction pluckId(layer) {\n    return layer.id;\n}\nfunction indexById(group, layer) {\n    group[layer.id] = layer;\n    return group;\n}\n\nfunction diffLayers(before, after, commands) {\n    before = before || [];\n    after = after || [];\n\n    // order of layers by id\n    const beforeOrder = before.map(pluckId);\n    const afterOrder = after.map(pluckId);\n\n    // index of layer by id\n    const beforeIndex = before.reduce(indexById, {});\n    const afterIndex = after.reduce(indexById, {});\n\n    // track order of layers as if they have been mutated\n    const tracker = beforeOrder.slice();\n\n    // layers that have been added do not need to be diffed\n    const clean = Object.create(null);\n\n    let i, d, layerId, beforeLayer, afterLayer, insertBeforeLayerId, prop;\n\n    // remove layers\n    for (i = 0, d = 0; i < beforeOrder.length; i++) {\n        layerId = beforeOrder[i];\n        if (!afterIndex.hasOwnProperty(layerId)) {\n            commands.push({ command: operations.removeLayer, args: [layerId] });\n            tracker.splice(tracker.indexOf(layerId, d), 1);\n        } else {\n            // limit where in tracker we need to look for a match\n            d++;\n        }\n    }\n\n    // add/reorder layers\n    for (i = 0, d = 0; i < afterOrder.length; i++) {\n        // work backwards as insert is before an existing layer\n        layerId = afterOrder[afterOrder.length - 1 - i];\n\n        if (tracker[tracker.length - 1 - i] === layerId) continue;\n\n        if (beforeIndex.hasOwnProperty(layerId)) {\n            // remove the layer before we insert at the correct position\n            commands.push({ command: operations.removeLayer, args: [layerId] });\n            tracker.splice(tracker.lastIndexOf(layerId, tracker.length - d), 1);\n        } else {\n            // limit where in tracker we need to look for a match\n            d++;\n        }\n\n        // add layer at correct position\n        insertBeforeLayerId = tracker[tracker.length - i];\n        commands.push({ command: operations.addLayer, args: [afterIndex[layerId], insertBeforeLayerId] });\n        tracker.splice(tracker.length - i, 0, layerId);\n        clean[layerId] = true;\n    }\n\n    // update layers\n    for (i = 0; i < afterOrder.length; i++) {\n        layerId = afterOrder[i];\n        beforeLayer = beforeIndex[layerId];\n        afterLayer = afterIndex[layerId];\n\n        // no need to update if previously added (new or moved)\n        if (clean[layerId] || isEqual(beforeLayer, afterLayer)) continue;\n\n        // If source, source-layer, or type have changes, then remove the layer\n        // and add it back 'from scratch'.\n        if (!isEqual(beforeLayer.source, afterLayer.source) || !isEqual(beforeLayer['source-layer'], afterLayer['source-layer']) || !isEqual(beforeLayer.type, afterLayer.type)) {\n            commands.push({ command: operations.removeLayer, args: [layerId] });\n            // we add the layer back at the same position it was already in, so\n            // there's no need to update the `tracker`\n            insertBeforeLayerId = tracker[tracker.lastIndexOf(layerId) + 1];\n            commands.push({ command: operations.addLayer, args: [afterLayer, insertBeforeLayerId] });\n            continue;\n        }\n\n        // layout, paint, filter, minzoom, maxzoom\n        diffLayerPropertyChanges(beforeLayer.layout, afterLayer.layout, commands, layerId, null, operations.setLayoutProperty);\n        diffLayerPropertyChanges(beforeLayer.paint, afterLayer.paint, commands, layerId, null, operations.setPaintProperty);\n        if (!isEqual(beforeLayer.filter, afterLayer.filter)) {\n            commands.push({ command: operations.setFilter, args: [layerId, afterLayer.filter] });\n        }\n        if (!isEqual(beforeLayer.minzoom, afterLayer.minzoom) || !isEqual(beforeLayer.maxzoom, afterLayer.maxzoom)) {\n            commands.push({ command: operations.setLayerZoomRange, args: [layerId, afterLayer.minzoom, afterLayer.maxzoom] });\n        }\n\n        // handle all other layer props, including paint.*\n        for (prop in beforeLayer) {\n            if (!beforeLayer.hasOwnProperty(prop)) continue;\n            if (prop === 'layout' || prop === 'paint' || prop === 'filter' ||\n                prop === 'metadata' || prop === 'minzoom' || prop === 'maxzoom') continue;\n            if (prop.indexOf('paint.') === 0) {\n                diffLayerPropertyChanges(beforeLayer[prop], afterLayer[prop], commands, layerId, prop.slice(6), operations.setPaintProperty);\n            } else if (!isEqual(beforeLayer[prop], afterLayer[prop])) {\n                commands.push({ command: operations.setLayerProperty, args: [layerId, prop, afterLayer[prop]] });\n            }\n        }\n        for (prop in afterLayer) {\n            if (!afterLayer.hasOwnProperty(prop) || beforeLayer.hasOwnProperty(prop)) continue;\n            if (prop === 'layout' || prop === 'paint' || prop === 'filter' ||\n                prop === 'metadata' || prop === 'minzoom' || prop === 'maxzoom') continue;\n            if (prop.indexOf('paint.') === 0) {\n                diffLayerPropertyChanges(beforeLayer[prop], afterLayer[prop], commands, layerId, prop.slice(6), operations.setPaintProperty);\n            } else if (!isEqual(beforeLayer[prop], afterLayer[prop])) {\n                commands.push({ command: operations.setLayerProperty, args: [layerId, prop, afterLayer[prop]] });\n            }\n        }\n    }\n}\n\n/**\n * Diff two stylesheet\n *\n * Creates semanticly aware diffs that can easily be applied at runtime.\n * Operations produced by the diff closely resemble the mapbox-gl-js API. Any\n * error creating the diff will fall back to the 'setStyle' operation.\n *\n * Example diff:\n * [\n *     { command: 'setConstant', args: ['@water', '#0000FF'] },\n *     { command: 'setPaintProperty', args: ['background', 'background-color', 'black'] }\n * ]\n *\n * @private\n * @param {*} [before] stylesheet to compare from\n * @param {*} after stylesheet to compare to\n * @returns Array list of changes\n */\nfunction diffStyles(before, after) {\n    if (!before) return [{ command: operations.setStyle, args: [after] }];\n\n    let commands = [];\n\n    try {\n        // Handle changes to top-level properties\n        if (!isEqual(before.version, after.version)) {\n            return [{ command: operations.setStyle, args: [after] }];\n        }\n        if (!isEqual(before.center, after.center)) {\n            commands.push({ command: operations.setCenter, args: [after.center] });\n        }\n        if (!isEqual(before.zoom, after.zoom)) {\n            commands.push({ command: operations.setZoom, args: [after.zoom] });\n        }\n        if (!isEqual(before.bearing, after.bearing)) {\n            commands.push({ command: operations.setBearing, args: [after.bearing] });\n        }\n        if (!isEqual(before.pitch, after.pitch)) {\n            commands.push({ command: operations.setPitch, args: [after.pitch] });\n        }\n        if (!isEqual(before.sprite, after.sprite)) {\n            commands.push({ command: operations.setSprite, args: [after.sprite] });\n        }\n        if (!isEqual(before.glyphs, after.glyphs)) {\n            commands.push({ command: operations.setGlyphs, args: [after.glyphs] });\n        }\n        if (!isEqual(before.transition, after.transition)) {\n            commands.push({ command: operations.setTransition, args: [after.transition] });\n        }\n        if (!isEqual(before.light, after.light)) {\n            commands.push({ command: operations.setLight, args: [after.light] });\n        }\n\n        // Handle changes to `sources`\n        // If a source is to be removed, we also--before the removeSource\n        // command--need to remove all the style layers that depend on it.\n        const sourcesRemoved = {};\n\n        // First collect the {add,remove}Source commands\n        const removeOrAddSourceCommands = [];\n        diffSources(before.sources, after.sources, removeOrAddSourceCommands, sourcesRemoved);\n\n        // Push a removeLayer command for each style layer that depends on a\n        // source that's being removed.\n        // Also, exclude any such layers them from the input to `diffLayers`\n        // below, so that diffLayers produces the appropriate `addLayers`\n        // command\n        const beforeLayers = [];\n        if (before.layers) {\n            before.layers.forEach((layer) => {\n                if (sourcesRemoved[layer.source]) {\n                    commands.push({ command: operations.removeLayer, args: [layer.id] });\n                } else {\n                    beforeLayers.push(layer);\n                }\n            });\n        }\n        commands = commands.concat(removeOrAddSourceCommands);\n\n        // Handle changes to `layers`\n        diffLayers(beforeLayers, after.layers, commands);\n\n    } catch (e) {\n        // fall back to setStyle\n        console.warn('Unable to compute style diff:', e);\n        commands = [{ command: operations.setStyle, args: [after] }];\n    }\n\n    return commands;\n}\n\nexport default diffStyles;\nexport { operations };\n","\nexport default class ValidationError {\n    constructor(key, value, message, identifier) {\n        this.message = (key ? `${key}: ` : '') + message;\n        if (identifier) this.identifier = identifier;\n\n        if (value !== null && value !== undefined && value.__line__) {\n            this.line = value.__line__;\n        }\n    }\n}\n","\nfunction ParsingError(error) {\n    this.error = error;\n    this.message = error.message;\n    const match = error.message.match(/line (\\d+)/);\n    this.line = match ? parseInt(match[1], 10) : 0;\n}\n\nexport default ParsingError;\n","\nimport ValidationError from '../error/validation_error';\n\nexport default function validateConstants(options) {\n    const key = options.key;\n    const constants = options.value;\n\n    if (constants) {\n        return [new ValidationError(key, constants, 'constants have been deprecated as of v8')];\n    } else {\n        return [];\n    }\n}\n","\n// Turn jsonlint-lines-primitives objects into primitive objects\nexport function unbundle(value) {\n    if (value instanceof Number || value instanceof String || value instanceof Boolean) {\n        return value.valueOf();\n    } else {\n        return value;\n    }\n}\n\nexport function deepUnbundle(value) {\n    if (Array.isArray(value)) {\n        return value.map(deepUnbundle);\n    }\n    return unbundle(value);\n}\n\n","\nimport ValidationError from '../error/validation_error';\nimport getType from '../util/get_type';\nimport validateSpec from './validate';\n\nexport default function validateObject(options) {\n    const key = options.key;\n    const object = options.value;\n    const elementSpecs = options.valueSpec || {};\n    const elementValidators = options.objectElementValidators || {};\n    const style = options.style;\n    const styleSpec = options.styleSpec;\n    let errors = [];\n\n    const type = getType(object);\n    if (type !== 'object') {\n        return [new ValidationError(key, object, `object expected, ${type} found`)];\n    }\n\n    for (const objectKey in object) {\n        const elementSpecKey = objectKey.split('.')[0]; // treat 'paint.*' as 'paint'\n        const elementSpec = elementSpecs[elementSpecKey] || elementSpecs['*'];\n\n        let validateElement;\n        if (elementValidators[elementSpecKey]) {\n            validateElement = elementValidators[elementSpecKey];\n        } else if (elementSpecs[elementSpecKey]) {\n            validateElement = validateSpec;\n        } else if (elementValidators['*']) {\n            validateElement = elementValidators['*'];\n        } else if (elementSpecs['*']) {\n            validateElement = validateSpec;\n        } else {\n            errors.push(new ValidationError(key, object[objectKey], `unknown property \"${objectKey}\"`));\n            continue;\n        }\n\n        errors = errors.concat(validateElement({\n            key: (key ? `${key}.` : key) + objectKey,\n            value: object[objectKey],\n            valueSpec: elementSpec,\n            style: style,\n            styleSpec: styleSpec,\n            object: object,\n            objectKey: objectKey\n        }, object));\n    }\n\n    for (const elementSpecKey in elementSpecs) {\n        // Don't check `required` when there's a custom validator for that property.\n        if (elementValidators[elementSpecKey]) {\n            continue;\n        }\n\n        if (elementSpecs[elementSpecKey].required && elementSpecs[elementSpecKey]['default'] === undefined && object[elementSpecKey] === undefined) {\n            errors.push(new ValidationError(key, object, `missing required property \"${elementSpecKey}\"`));\n        }\n    }\n\n    return errors;\n}\n","\nimport getType from '../util/get_type';\nimport validate from './validate';\nimport ValidationError from '../error/validation_error';\n\nexport default function validateArray(options) {\n    const array = options.value;\n    const arraySpec = options.valueSpec;\n    const style = options.style;\n    const styleSpec = options.styleSpec;\n    const key = options.key;\n    const validateArrayElement = options.arrayElementValidator || validate;\n\n    if (getType(array) !== 'array') {\n        return [new ValidationError(key, array, `array expected, ${getType(array)} found`)];\n    }\n\n    if (arraySpec.length && array.length !== arraySpec.length) {\n        return [new ValidationError(key, array, `array length ${arraySpec.length} expected, length ${array.length} found`)];\n    }\n\n    if (arraySpec['min-length'] && array.length < arraySpec['min-length']) {\n        return [new ValidationError(key, array, `array length at least ${arraySpec['min-length']} expected, length ${array.length} found`)];\n    }\n\n    let arrayElementSpec = {\n        \"type\": arraySpec.value\n    };\n\n    if (styleSpec.$version < 7) {\n        arrayElementSpec.function = arraySpec.function;\n    }\n\n    if (getType(arraySpec.value) === 'object') {\n        arrayElementSpec = arraySpec.value;\n    }\n\n    let errors = [];\n    for (let i = 0; i < array.length; i++) {\n        errors = errors.concat(validateArrayElement({\n            array: array,\n            arrayIndex: i,\n            value: array[i],\n            valueSpec: arrayElementSpec,\n            style: style,\n            styleSpec: styleSpec,\n            key: `${key}[${i}]`\n        }));\n    }\n    return errors;\n}\n","\nimport getType from '../util/get_type';\nimport ValidationError from '../error/validation_error';\n\nexport default function validateNumber(options) {\n    const key = options.key;\n    const value = options.value;\n    const valueSpec = options.valueSpec;\n    const type = getType(value);\n\n    if (type !== 'number') {\n        return [new ValidationError(key, value, `number expected, ${type} found`)];\n    }\n\n    if ('minimum' in valueSpec && value < valueSpec.minimum) {\n        return [new ValidationError(key, value, `${value} is less than the minimum value ${valueSpec.minimum}`)];\n    }\n\n    if ('maximum' in valueSpec && value > valueSpec.maximum) {\n        return [new ValidationError(key, value, `${value} is greater than the maximum value ${valueSpec.maximum}`)];\n    }\n\n    return [];\n}\n","\nimport ValidationError from '../error/validation_error';\nimport getType from '../util/get_type';\nimport validate from './validate';\nimport validateObject from './validate_object';\nimport validateArray from './validate_array';\nimport validateNumber from './validate_number';\nimport { unbundle } from '../util/unbundle_jsonlint';\nimport {\n    supportsPropertyExpression,\n    supportsZoomExpression,\n    supportsInterpolation\n} from '../util/properties';\n\nexport default function validateFunction(options) {\n    const functionValueSpec = options.valueSpec;\n    const functionType = unbundle(options.value.type);\n    let stopKeyType;\n    let stopDomainValues = {};\n    let previousStopDomainValue;\n    let previousStopDomainZoom;\n\n    const isZoomFunction = functionType !== 'categorical' && options.value.property === undefined;\n    const isPropertyFunction = !isZoomFunction;\n    const isZoomAndPropertyFunction =\n        getType(options.value.stops) === 'array' &&\n        getType(options.value.stops[0]) === 'array' &&\n        getType(options.value.stops[0][0]) === 'object';\n\n    const errors = validateObject({\n        key: options.key,\n        value: options.value,\n        valueSpec: options.styleSpec.function,\n        style: options.style,\n        styleSpec: options.styleSpec,\n        objectElementValidators: {\n            stops: validateFunctionStops,\n            default: validateFunctionDefault\n        }\n    });\n\n    if (functionType === 'identity' && isZoomFunction) {\n        errors.push(new ValidationError(options.key, options.value, 'missing required property \"property\"'));\n    }\n\n    if (functionType !== 'identity' && !options.value.stops) {\n        errors.push(new ValidationError(options.key, options.value, 'missing required property \"stops\"'));\n    }\n\n    if (functionType === 'exponential' && options.valueSpec.expression && !supportsInterpolation(options.valueSpec)) {\n        errors.push(new ValidationError(options.key, options.value, 'exponential functions not supported'));\n    }\n\n    if (options.styleSpec.$version >= 8) {\n        if (isPropertyFunction && !supportsPropertyExpression(options.valueSpec)) {\n            errors.push(new ValidationError(options.key, options.value, 'property functions not supported'));\n        } else if (isZoomFunction && !supportsZoomExpression(options.valueSpec)) {\n            errors.push(new ValidationError(options.key, options.value, 'zoom functions not supported'));\n        }\n    }\n\n    if ((functionType === 'categorical' || isZoomAndPropertyFunction) && options.value.property === undefined) {\n        errors.push(new ValidationError(options.key, options.value, '\"property\" property is required'));\n    }\n\n    return errors;\n\n    function validateFunctionStops(options) {\n        if (functionType === 'identity') {\n            return [new ValidationError(options.key, options.value, 'identity function may not have a \"stops\" property')];\n        }\n\n        let errors = [];\n        const value = options.value;\n\n        errors = errors.concat(validateArray({\n            key: options.key,\n            value: value,\n            valueSpec: options.valueSpec,\n            style: options.style,\n            styleSpec: options.styleSpec,\n            arrayElementValidator: validateFunctionStop\n        }));\n\n        if (getType(value) === 'array' && value.length === 0) {\n            errors.push(new ValidationError(options.key, value, 'array must have at least one stop'));\n        }\n\n        return errors;\n    }\n\n    function validateFunctionStop(options) {\n        let errors = [];\n        const value = options.value;\n        const key = options.key;\n\n        if (getType(value) !== 'array') {\n            return [new ValidationError(key, value, `array expected, ${getType(value)} found`)];\n        }\n\n        if (value.length !== 2) {\n            return [new ValidationError(key, value, `array length 2 expected, length ${value.length} found`)];\n        }\n\n        if (isZoomAndPropertyFunction) {\n            if (getType(value[0]) !== 'object') {\n                return [new ValidationError(key, value, `object expected, ${getType(value[0])} found`)];\n            }\n            if (value[0].zoom === undefined) {\n                return [new ValidationError(key, value, 'object stop key must have zoom')];\n            }\n            if (value[0].value === undefined) {\n                return [new ValidationError(key, value, 'object stop key must have value')];\n            }\n            if (previousStopDomainZoom && previousStopDomainZoom > unbundle(value[0].zoom)) {\n                return [new ValidationError(key, value[0].zoom, 'stop zoom values must appear in ascending order')];\n            }\n            if (unbundle(value[0].zoom) !== previousStopDomainZoom) {\n                previousStopDomainZoom = unbundle(value[0].zoom);\n                previousStopDomainValue = undefined;\n                stopDomainValues = {};\n            }\n            errors = errors.concat(validateObject({\n                key: `${key}[0]`,\n                value: value[0],\n                valueSpec: { zoom: {} },\n                style: options.style,\n                styleSpec: options.styleSpec,\n                objectElementValidators: { zoom: validateNumber, value: validateStopDomainValue }\n            }));\n        } else {\n            errors = errors.concat(validateStopDomainValue({\n                key: `${key}[0]`,\n                value: value[0],\n                valueSpec: {},\n                style: options.style,\n                styleSpec: options.styleSpec\n            }, value));\n        }\n\n        return errors.concat(validate({\n            key: `${key}[1]`,\n            value: value[1],\n            valueSpec: functionValueSpec,\n            style: options.style,\n            styleSpec: options.styleSpec\n        }));\n    }\n\n    function validateStopDomainValue(options, stop) {\n        const type = getType(options.value);\n        const value = unbundle(options.value);\n\n        const reportValue = options.value !== null ? options.value : stop;\n\n        if (!stopKeyType) {\n            stopKeyType = type;\n        } else if (type !== stopKeyType) {\n            return [new ValidationError(options.key, reportValue, `${type} stop domain type must match previous stop domain type ${stopKeyType}`)];\n        }\n\n        if (type !== 'number' && type !== 'string' && type !== 'boolean') {\n            return [new ValidationError(options.key, reportValue, 'stop domain value must be a number, string, or boolean')];\n        }\n\n        if (type !== 'number' && functionType !== 'categorical') {\n            let message = `number expected, ${type} found`;\n            if (supportsPropertyExpression(functionValueSpec) && functionType === undefined) {\n                message += '\\nIf you intended to use a categorical function, specify `\"type\": \"categorical\"`.';\n            }\n            return [new ValidationError(options.key, reportValue, message)];\n        }\n\n        if (functionType === 'categorical' && type === 'number' && (!isFinite(value) || Math.floor(value) !== value)) {\n            return [new ValidationError(options.key, reportValue, `integer expected, found ${value}`)];\n        }\n\n        if (functionType !== 'categorical' && type === 'number' && previousStopDomainValue !== undefined && value < previousStopDomainValue) {\n            return [new ValidationError(options.key, reportValue, 'stop domain values must appear in ascending order')];\n        } else {\n            previousStopDomainValue = value;\n        }\n\n        if (functionType === 'categorical' && value in stopDomainValues) {\n            return [new ValidationError(options.key, reportValue, 'stop domain values must be unique')];\n        } else {\n            stopDomainValues[value] = true;\n        }\n\n        return [];\n    }\n\n    function validateFunctionDefault(options) {\n        return validate({\n            key: options.key,\n            value: options.value,\n            valueSpec: functionValueSpec,\n            style: options.style,\n            styleSpec: options.styleSpec\n        });\n    }\n}\n","// @flow\n\nimport ValidationError from '../error/validation_error';\n\nimport { createExpression, createPropertyExpression } from '../expression';\nimport { deepUnbundle } from '../util/unbundle_jsonlint';\nimport { isStateConstant } from '../expression/is_constant';\n\nexport default function validateExpression(options: any) {\n    const expression = (options.expressionContext === 'property' ? createPropertyExpression : createExpression)(deepUnbundle(options.value), options.valueSpec);\n    if (expression.result === 'error') {\n        return expression.value.map((error) => {\n            return new ValidationError(`${options.key}${error.key}`, options.value, error.message);\n        });\n    }\n\n    if (options.expressionContext === 'property' && (options.propertyKey === 'text-font') &&\n        (expression.value: any)._styleExpression.expression.possibleOutputs().indexOf(undefined) !== -1) {\n        return [new ValidationError(options.key, options.value, `Invalid data expression for \"${options.propertyKey}\". Output values must be contained as literals within the expression.`)];\n    }\n\n    if (options.expressionContext === 'property' && options.propertyType === 'layout' &&\n        (!isStateConstant((expression.value: any)._styleExpression.expression))) {\n        return [new ValidationError(options.key, options.value, '\"feature-state\" data expressions are not supported with layout properties.')];\n    }\n    return [];\n}\n","\nimport ValidationError from '../error/validation_error';\nimport { unbundle } from '../util/unbundle_jsonlint';\n\nexport default function validateEnum(options) {\n    const key = options.key;\n    const value = options.value;\n    const valueSpec = options.valueSpec;\n    const errors = [];\n\n    if (Array.isArray(valueSpec.values)) { // <=v7\n        if (valueSpec.values.indexOf(unbundle(value)) === -1) {\n            errors.push(new ValidationError(key, value, `expected one of [${valueSpec.values.join(', ')}], ${JSON.stringify(value)} found`));\n        }\n    } else { // >=v8\n        if (Object.keys(valueSpec.values).indexOf(unbundle(value)) === -1) {\n            errors.push(new ValidationError(key, value, `expected one of [${Object.keys(valueSpec.values).join(', ')}], ${JSON.stringify(value)} found`));\n        }\n    }\n    return errors;\n}\n","\nimport ValidationError from '../error/validation_error';\nimport validateExpression from './validate_expression';\nimport validateEnum from './validate_enum';\nimport getType from '../util/get_type';\nimport { unbundle, deepUnbundle } from '../util/unbundle_jsonlint';\nimport extend from '../util/extend';\nimport { isExpressionFilter } from '../feature_filter';\n\nexport default function validateFilter(options) {\n    if (isExpressionFilter(deepUnbundle(options.value))) {\n        return validateExpression(extend({}, options, {\n            expressionContext: 'filter',\n            valueSpec: { value: 'boolean' }\n        }));\n    } else {\n        return validateNonExpressionFilter(options);\n    }\n}\n\nfunction validateNonExpressionFilter(options) {\n    const value = options.value;\n    const key = options.key;\n\n    if (getType(value) !== 'array') {\n        return [new ValidationError(key, value, `array expected, ${getType(value)} found`)];\n    }\n\n    const styleSpec = options.styleSpec;\n    let type;\n\n    let errors = [];\n\n    if (value.length < 1) {\n        return [new ValidationError(key, value, 'filter array must have at least 1 element')];\n    }\n\n    errors = errors.concat(validateEnum({\n        key: `${key}[0]`,\n        value: value[0],\n        valueSpec: styleSpec.filter_operator,\n        style: options.style,\n        styleSpec: options.styleSpec\n    }));\n\n    switch (unbundle(value[0])) {\n    case '<':\n    case '<=':\n    case '>':\n    case '>=':\n        if (value.length >= 2 && unbundle(value[1]) === '$type') {\n            errors.push(new ValidationError(key, value, `\"$type\" cannot be use with operator \"${value[0]}\"`));\n        }\n        /* falls through */\n    case '==':\n    case '!=':\n        if (value.length !== 3) {\n            errors.push(new ValidationError(key, value, `filter array for operator \"${value[0]}\" must have 3 elements`));\n        }\n        /* falls through */\n    case 'in':\n    case '!in':\n        if (value.length >= 2) {\n            type = getType(value[1]);\n            if (type !== 'string') {\n                errors.push(new ValidationError(`${key}[1]`, value[1], `string expected, ${type} found`));\n            }\n        }\n        for (let i = 2; i < value.length; i++) {\n            type = getType(value[i]);\n            if (unbundle(value[1]) === '$type') {\n                errors = errors.concat(validateEnum({\n                    key: `${key}[${i}]`,\n                    value: value[i],\n                    valueSpec: styleSpec.geometry_type,\n                    style: options.style,\n                    styleSpec: options.styleSpec\n                }));\n            } else if (type !== 'string' && type !== 'number' && type !== 'boolean') {\n                errors.push(new ValidationError(`${key}[${i}]`, value[i], `string, number, or boolean expected, ${type} found`));\n            }\n        }\n        break;\n\n    case 'any':\n    case 'all':\n    case 'none':\n        for (let i = 1; i < value.length; i++) {\n            errors = errors.concat(validateNonExpressionFilter({\n                key: `${key}[${i}]`,\n                value: value[i],\n                style: options.style,\n                styleSpec: options.styleSpec\n            }));\n        }\n        break;\n\n    case 'has':\n    case '!has':\n        type = getType(value[1]);\n        if (value.length !== 2) {\n            errors.push(new ValidationError(key, value, `filter array for \"${value[0]}\" operator must have 2 elements`));\n        } else if (type !== 'string') {\n            errors.push(new ValidationError(`${key}[1]`, value[1], `string expected, ${type} found`));\n        }\n        break;\n\n    }\n\n    return errors;\n}\n","\nimport validate from './validate';\nimport ValidationError from '../error/validation_error';\nimport getType from '../util/get_type';\nimport { isFunction } from '../function';\nimport { unbundle, deepUnbundle } from '../util/unbundle_jsonlint';\nimport { supportsPropertyExpression } from '../util/properties';\n\nexport default function validateProperty(options, propertyType) {\n    const key = options.key;\n    const style = options.style;\n    const styleSpec = options.styleSpec;\n    const value = options.value;\n    const propertyKey = options.objectKey;\n    const layerSpec = styleSpec[`${propertyType}_${options.layerType}`];\n\n    if (!layerSpec) return [];\n\n    const transitionMatch = propertyKey.match(/^(.*)-transition$/);\n    if (propertyType === 'paint' && transitionMatch && layerSpec[transitionMatch[1]] && layerSpec[transitionMatch[1]].transition) {\n        return validate({\n            key: key,\n            value: value,\n            valueSpec: styleSpec.transition,\n            style: style,\n            styleSpec: styleSpec\n        });\n    }\n\n    const valueSpec = options.valueSpec || layerSpec[propertyKey];\n    if (!valueSpec) {\n        return [new ValidationError(key, value, `unknown property \"${propertyKey}\"`)];\n    }\n\n    let tokenMatch;\n    if (getType(value) === 'string' && supportsPropertyExpression(valueSpec) && !valueSpec.tokens && (tokenMatch = /^{([^}]+)}$/.exec(value))) {\n        return [new ValidationError(\n            key, value,\n            `\"${propertyKey}\" does not support interpolation syntax\\n` +\n                `Use an identity property function instead: \\`{ \"type\": \"identity\", \"property\": ${JSON.stringify(tokenMatch[1])} }\\`.`)];\n    }\n\n    const errors = [];\n\n    if (options.layerType === 'symbol') {\n        if (propertyKey === 'text-field' && style && !style.glyphs) {\n            errors.push(new ValidationError(key, value, 'use of \"text-field\" requires a style \"glyphs\" property'));\n        }\n        if (propertyKey === 'text-font' && isFunction(deepUnbundle(value)) && unbundle(value.type) === 'identity') {\n            errors.push(new ValidationError(key, value, '\"text-font\" does not support identity functions'));\n        }\n    }\n\n    return errors.concat(validate({\n        key: options.key,\n        value: value,\n        valueSpec: valueSpec,\n        style: style,\n        styleSpec: styleSpec,\n        expressionContext: 'property',\n        propertyType: propertyType,\n        propertyKey\n    }));\n}\n","\nimport validateProperty from './validate_property';\n\nexport default function validatePaintProperty(options) {\n    return validateProperty(options, 'paint');\n}\n","\nimport validateProperty from './validate_property';\n\nexport default function validateLayoutProperty(options) {\n    return validateProperty(options, 'layout');\n}\n","\nimport ValidationError from '../error/validation_error';\nimport { unbundle } from '../util/unbundle_jsonlint';\nimport validateObject from './validate_object';\nimport validateFilter from './validate_filter';\nimport validatePaintProperty from './validate_paint_property';\nimport validateLayoutProperty from './validate_layout_property';\nimport validateSpec from './validate';\nimport extend from '../util/extend';\n\nexport default function validateLayer(options) {\n    let errors = [];\n\n    const layer = options.value;\n    const key = options.key;\n    const style = options.style;\n    const styleSpec = options.styleSpec;\n\n    if (!layer.type && !layer.ref) {\n        errors.push(new ValidationError(key, layer, 'either \"type\" or \"ref\" is required'));\n    }\n    let type = unbundle(layer.type);\n    const ref = unbundle(layer.ref);\n\n    if (layer.id) {\n        const layerId = unbundle(layer.id);\n        for (let i = 0; i < options.arrayIndex; i++) {\n            const otherLayer = style.layers[i];\n            if (unbundle(otherLayer.id) === layerId) {\n                errors.push(new ValidationError(key, layer.id, `duplicate layer id \"${layer.id}\", previously used at line ${otherLayer.id.__line__}`));\n            }\n        }\n    }\n\n    if ('ref' in layer) {\n        ['type', 'source', 'source-layer', 'filter', 'layout'].forEach((p) => {\n            if (p in layer) {\n                errors.push(new ValidationError(key, layer[p], `\"${p}\" is prohibited for ref layers`));\n            }\n        });\n\n        let parent;\n\n        style.layers.forEach((layer) => {\n            if (unbundle(layer.id) === ref) parent = layer;\n        });\n\n        if (!parent) {\n            errors.push(new ValidationError(key, layer.ref, `ref layer \"${ref}\" not found`));\n        } else if (parent.ref) {\n            errors.push(new ValidationError(key, layer.ref, 'ref cannot reference another ref layer'));\n        } else {\n            type = unbundle(parent.type);\n        }\n    } else if (type !== 'background') {\n        if (!layer.source) {\n            errors.push(new ValidationError(key, layer, 'missing required property \"source\"'));\n        } else {\n            const source = style.sources && style.sources[layer.source];\n            const sourceType = source && unbundle(source.type);\n            if (!source) {\n                errors.push(new ValidationError(key, layer.source, `source \"${layer.source}\" not found`));\n            } else if (sourceType === 'vector' && type === 'raster') {\n                errors.push(new ValidationError(key, layer.source, `layer \"${layer.id}\" requires a raster source`));\n            } else if (sourceType === 'raster' && type !== 'raster') {\n                errors.push(new ValidationError(key, layer.source, `layer \"${layer.id}\" requires a vector source`));\n            } else if (sourceType === 'vector' && !layer['source-layer']) {\n                errors.push(new ValidationError(key, layer, `layer \"${layer.id}\" must specify a \"source-layer\"`));\n            } else if (sourceType === 'raster-dem' && type !== 'hillshade') {\n                errors.push(new ValidationError(key, layer.source, 'raster-dem source can only be used with layer type \\'hillshade\\'.'));\n            } else if (type === 'line' && layer.paint && layer.paint['line-gradient'] &&\n                       (sourceType !== 'geojson' || !source.lineMetrics)) {\n                errors.push(new ValidationError(key, layer, `layer \"${layer.id}\" specifies a line-gradient, which requires a GeoJSON source with \\`lineMetrics\\` enabled.`));\n            }\n        }\n    }\n\n    errors = errors.concat(validateObject({\n        key: key,\n        value: layer,\n        valueSpec: styleSpec.layer,\n        style: options.style,\n        styleSpec: options.styleSpec,\n        objectElementValidators: {\n            '*': function() {\n                return [];\n            },\n            // We don't want to enforce the spec's `\"requires\": true` for backward compatibility with refs;\n            // the actual requirement is validated above. See https://github.com/mapbox/mapbox-gl-js/issues/5772.\n            type: function() {\n                return validateSpec({\n                    key: `${key}.type`,\n                    value: layer.type,\n                    valueSpec: styleSpec.layer.type,\n                    style: options.style,\n                    styleSpec: options.styleSpec,\n                    object: layer,\n                    objectKey: 'type'\n                });\n            },\n            filter: validateFilter,\n            layout: function(options) {\n                return validateObject({\n                    layer: layer,\n                    key: options.key,\n                    value: options.value,\n                    style: options.style,\n                    styleSpec: options.styleSpec,\n                    objectElementValidators: {\n                        '*': function(options) {\n                            return validateLayoutProperty(extend({layerType: type}, options));\n                        }\n                    }\n                });\n            },\n            paint: function(options) {\n                return validateObject({\n                    layer: layer,\n                    key: options.key,\n                    value: options.value,\n                    style: options.style,\n                    styleSpec: options.styleSpec,\n                    objectElementValidators: {\n                        '*': function(options) {\n                            return validatePaintProperty(extend({layerType: type}, options));\n                        }\n                    }\n                });\n            }\n        }\n    }));\n\n    return errors;\n}\n","\nimport ValidationError from '../error/validation_error';\nimport { unbundle } from '../util/unbundle_jsonlint';\nimport validateObject from './validate_object';\nimport validateEnum from './validate_enum';\n\nexport default function validateSource(options) {\n    const value = options.value;\n    const key = options.key;\n    const styleSpec = options.styleSpec;\n    const style = options.style;\n\n    if (!value.type) {\n        return [new ValidationError(key, value, '\"type\" is required')];\n    }\n\n    const type = unbundle(value.type);\n    let errors = [];\n\n    switch (type) {\n    case 'vector':\n    case 'raster':\n    case 'raster-dem':\n        errors = errors.concat(validateObject({\n            key: key,\n            value: value,\n            valueSpec: styleSpec[`source_${type.replace('-', '_')}`],\n            style: options.style,\n            styleSpec: styleSpec\n        }));\n        if ('url' in value) {\n            for (const prop in value) {\n                if (['type', 'url', 'tileSize'].indexOf(prop) < 0) {\n                    errors.push(new ValidationError(`${key}.${prop}`, value[prop], `a source with a \"url\" property may not include a \"${prop}\" property`));\n                }\n            }\n        }\n        return errors;\n\n    case 'geojson':\n        return validateObject({\n            key: key,\n            value: value,\n            valueSpec: styleSpec.source_geojson,\n            style: style,\n            styleSpec: styleSpec\n        });\n\n    case 'video':\n        return validateObject({\n            key: key,\n            value: value,\n            valueSpec: styleSpec.source_video,\n            style: style,\n            styleSpec: styleSpec\n        });\n\n    case 'image':\n        return validateObject({\n            key: key,\n            value: value,\n            valueSpec: styleSpec.source_image,\n            style: style,\n            styleSpec: styleSpec\n        });\n\n    case 'canvas':\n        errors.push(new ValidationError(key, null, `Please use runtime APIs to add canvas sources, rather than including them in stylesheets.`, 'source.canvas'));\n        return errors;\n\n    default:\n        return validateEnum({\n            key: `${key}.type`,\n            value: value.type,\n            valueSpec: {values: ['vector', 'raster', 'raster-dem', 'geojson', 'video', 'image']},\n            style: style,\n            styleSpec: styleSpec\n        });\n    }\n}\n","\nimport ValidationError from '../error/validation_error';\nimport getType from '../util/get_type';\nimport validate from './validate';\n\nexport default function validateLight(options) {\n    const light = options.value;\n    const styleSpec = options.styleSpec;\n    const lightSpec = styleSpec.light;\n    const style = options.style;\n\n    let errors = [];\n\n    const rootType = getType(light);\n    if (light === undefined) {\n        return errors;\n    } else if (rootType !== 'object') {\n        errors = errors.concat([new ValidationError('light', light, `object expected, ${rootType} found`)]);\n        return errors;\n    }\n\n    for (const key in light) {\n        const transitionMatch = key.match(/^(.*)-transition$/);\n\n        if (transitionMatch && lightSpec[transitionMatch[1]] && lightSpec[transitionMatch[1]].transition) {\n            errors = errors.concat(validate({\n                key: key,\n                value: light[key],\n                valueSpec: styleSpec.transition,\n                style: style,\n                styleSpec: styleSpec\n            }));\n        } else if (lightSpec[key]) {\n            errors = errors.concat(validate({\n                key: key,\n                value: light[key],\n                valueSpec: lightSpec[key],\n                style: style,\n                styleSpec: styleSpec\n            }));\n        } else {\n            errors = errors.concat([new ValidationError(key, light[key], `unknown property \"${key}\"`)]);\n        }\n    }\n\n    return errors;\n}\n","\nimport getType from '../util/get_type';\nimport ValidationError from '../error/validation_error';\n\nexport default function validateString(options) {\n    const value = options.value;\n    const key = options.key;\n    const type = getType(value);\n\n    if (type !== 'string') {\n        return [new ValidationError(key, value, `string expected, ${type} found`)];\n    }\n\n    return [];\n}\n","\nimport extend from '../util/extend';\nimport { unbundle, deepUnbundle } from '../util/unbundle_jsonlint';\nimport { isExpression } from '../expression';\nimport { isFunction } from '../function';\n\nimport validateFunction from './validate_function';\nimport validateExpression from './validate_expression';\nimport validateObject from './validate_object';\nimport validateArray from './validate_array';\nimport validateBoolean from './validate_boolean';\nimport validateNumber from './validate_number';\nimport validateColor from './validate_color';\nimport validateConstants from './validate_constants';\nimport validateEnum from './validate_enum';\nimport validateFilter from './validate_filter';\nimport validateLayer from './validate_layer';\nimport validateSource from './validate_source';\nimport validateLight from './validate_light';\nimport validateString from './validate_string';\nimport validateFormatted from './validate_formatted';\n\nconst VALIDATORS = {\n    '*': function() {\n        return [];\n    },\n    'array': validateArray,\n    'boolean': validateBoolean,\n    'number': validateNumber,\n    'color': validateColor,\n    'constants': validateConstants,\n    'enum': validateEnum,\n    'filter': validateFilter,\n    'function': validateFunction,\n    'layer': validateLayer,\n    'object': validateObject,\n    'source': validateSource,\n    'light': validateLight,\n    'string': validateString,\n    'formatted': validateFormatted\n};\n\n\n// Main recursive validation function. Tracks:\n//\n// - key: string representing location of validation in style tree. Used only\n//   for more informative error reporting.\n// - value: current value from style being evaluated. May be anything from a\n//   high level object that needs to be descended into deeper or a simple\n//   scalar value.\n// - valueSpec: current spec being evaluated. Tracks value.\n// - styleSpec: current full spec being evaluated.\n\nexport default function validate(options) {\n    const value = options.value;\n    const valueSpec = options.valueSpec;\n    const styleSpec = options.styleSpec;\n\n    if (valueSpec.expression && isFunction(unbundle(value))) {\n        return validateFunction(options);\n\n    } else if (valueSpec.expression && isExpression(deepUnbundle(value))) {\n        return validateExpression(options);\n\n    } else if (valueSpec.type && VALIDATORS[valueSpec.type]) {\n        return VALIDATORS[valueSpec.type](options);\n\n    } else {\n        const valid = validateObject(extend({}, options, {\n            valueSpec: valueSpec.type ? styleSpec[valueSpec.type] : valueSpec\n        }));\n        return valid;\n    }\n}\n","\nimport getType from '../util/get_type';\nimport ValidationError from '../error/validation_error';\n\nexport default function validateBoolean(options) {\n    const value = options.value;\n    const key = options.key;\n    const type = getType(value);\n\n    if (type !== 'boolean') {\n        return [new ValidationError(key, value, `boolean expected, ${type} found`)];\n    }\n\n    return [];\n}\n","\nimport ValidationError from '../error/validation_error';\nimport getType from '../util/get_type';\nimport { parseCSSColor } from 'csscolorparser';\n\nexport default function validateColor(options) {\n    const key = options.key;\n    const value = options.value;\n    const type = getType(value);\n\n    if (type !== 'string') {\n        return [new ValidationError(key, value, `color expected, ${type} found`)];\n    }\n\n    if (parseCSSColor(value) === null) {\n        return [new ValidationError(key, value, `color expected, \"${value}\" found`)];\n    }\n\n    return [];\n}\n","// @flow\nimport validateExpression from './validate_expression';\nimport validateString from './validate_string';\n\nexport default function validateFormatted(options: any) {\n    if (validateString(options).length === 0) {\n        return [];\n    }\n\n    return validateExpression(options);\n}\n","\nimport ValidationError from '../error/validation_error';\nimport validateString from './validate_string';\n\nexport default function(options) {\n    const value = options.value;\n    const key = options.key;\n\n    const errors = validateString(options);\n    if (errors.length) return errors;\n\n    if (value.indexOf('{fontstack}') === -1) {\n        errors.push(new ValidationError(key, value, '\"glyphs\" url must include a \"{fontstack}\" token'));\n    }\n\n    if (value.indexOf('{range}') === -1) {\n        errors.push(new ValidationError(key, value, '\"glyphs\" url must include a \"{range}\" token'));\n    }\n\n    return errors;\n}\n","\nimport validateConstants from './validate/validate_constants';\nimport validate from './validate/validate';\nimport latestStyleSpec from './reference/latest';\nimport validateGlyphsURL from './validate/validate_glyphs_url';\n\nimport validateSource from './validate/validate_source';\nimport validateLight from './validate/validate_light';\nimport validateLayer from './validate/validate_layer';\nimport validateFilter from './validate/validate_filter';\nimport validatePaintProperty from './validate/validate_paint_property';\nimport validateLayoutProperty from './validate/validate_layout_property';\n\n/**\n * Validate a Mapbox GL style against the style specification. This entrypoint,\n * `mapbox-gl-style-spec/lib/validate_style.min`, is designed to produce as\n * small a browserify bundle as possible by omitting unnecessary functionality\n * and legacy style specifications.\n *\n * @private\n * @param {Object} style The style to be validated.\n * @param {Object} [styleSpec] The style specification to validate against.\n *     If omitted, the latest style spec is used.\n * @returns {Array<ValidationError>}\n * @example\n *   var validate = require('mapbox-gl-style-spec/lib/validate_style.min');\n *   var errors = validate(style);\n */\nfunction validateStyleMin(style, styleSpec) {\n    styleSpec = styleSpec || latestStyleSpec;\n\n    let errors = [];\n\n    errors = errors.concat(validate({\n        key: '',\n        value: style,\n        valueSpec: styleSpec.$root,\n        styleSpec: styleSpec,\n        style: style,\n        objectElementValidators: {\n            glyphs: validateGlyphsURL,\n            '*': function() {\n                return [];\n            }\n        }\n    }));\n\n    if (style.constants) {\n        errors = errors.concat(validateConstants({\n            key: 'constants',\n            value: style.constants,\n            style: style,\n            styleSpec: styleSpec\n        }));\n    }\n\n    return sortErrors(errors);\n}\n\nvalidateStyleMin.source = wrapCleanErrors(validateSource);\nvalidateStyleMin.light = wrapCleanErrors(validateLight);\nvalidateStyleMin.layer = wrapCleanErrors(validateLayer);\nvalidateStyleMin.filter = wrapCleanErrors(validateFilter);\nvalidateStyleMin.paintProperty = wrapCleanErrors(validatePaintProperty);\nvalidateStyleMin.layoutProperty = wrapCleanErrors(validateLayoutProperty);\n\nfunction sortErrors(errors) {\n    return [].concat(errors).sort((a, b) => {\n        return a.line - b.line;\n    });\n}\n\nfunction wrapCleanErrors(inner) {\n    return function() {\n        return sortErrors(inner.apply(this, arguments));\n    };\n}\n\nexport default validateStyleMin;\n","/* parser generated by jison 0.4.15 */\n/*\n  Returns a Parser object of the following structure:\n\n  Parser: {\n    yy: {}\n  }\n\n  Parser.prototype: {\n    yy: {},\n    trace: function(),\n    symbols_: {associative list: name ==> number},\n    terminals_: {associative list: number ==> name},\n    productions_: [...],\n    performAction: function anonymous(yytext, yyleng, yylineno, yy, yystate, $$, _$),\n    table: [...],\n    defaultActions: {...},\n    parseError: function(str, hash),\n    parse: function(input),\n\n    lexer: {\n        EOF: 1,\n        parseError: function(str, hash),\n        setInput: function(input),\n        input: function(),\n        unput: function(str),\n        more: function(),\n        less: function(n),\n        pastInput: function(),\n        upcomingInput: function(),\n        showPosition: function(),\n        test_match: function(regex_match_array, rule_index),\n        next: function(),\n        lex: function(),\n        begin: function(condition),\n        popState: function(),\n        _currentRules: function(),\n        topState: function(),\n        pushState: function(condition),\n\n        options: {\n            ranges: boolean           (optional: true ==> token location info will include a .range[] member)\n            flex: boolean             (optional: true ==> flex-like lexing behaviour where the rules are tested exhaustively to find the longest match)\n            backtrack_lexer: boolean  (optional: true ==> lexer regexes are tested in order and for each matching regex the action code is invoked; the lexer terminates the scan when a token is returned by the action code)\n        },\n\n        performAction: function(yy, yy_, $avoiding_name_collisions, YY_START),\n        rules: [...],\n        conditions: {associative list: name ==> set},\n    }\n  }\n\n\n  token location info (@$, _$, etc.): {\n    first_line: n,\n    last_line: n,\n    first_column: n,\n    last_column: n,\n    range: [start_number, end_number]       (where the numbers are indexes into the input string, regular zero-based)\n  }\n\n\n  the parseError function receives a 'hash' object with these members for lexer and parser errors: {\n    text:        (matched text)\n    token:       (the produced terminal token, if any)\n    line:        (yylineno)\n  }\n  while parser (grammar) errors will also provide these members, i.e. parser errors deliver a superset of attributes: {\n    loc:         (yylloc)\n    expected:    (string describing the set of expected tokens)\n    recoverable: (boolean: TRUE when the parser has a error recovery rule available for this particular error)\n  }\n*/\nvar parser = (function(){\nvar o=function(k,v,o,l){for(o=o||{},l=k.length;l--;o[k[l]]=v);return o},$V0=[1,12],$V1=[1,13],$V2=[1,9],$V3=[1,10],$V4=[1,11],$V5=[1,14],$V6=[1,15],$V7=[14,18,22,24],$V8=[18,22],$V9=[22,24];\nvar parser = {trace: function trace() { },\nyy: {},\nsymbols_: {\"error\":2,\"JSONString\":3,\"STRING\":4,\"JSONNumber\":5,\"NUMBER\":6,\"JSONNullLiteral\":7,\"NULL\":8,\"JSONBooleanLiteral\":9,\"TRUE\":10,\"FALSE\":11,\"JSONText\":12,\"JSONValue\":13,\"EOF\":14,\"JSONObject\":15,\"JSONArray\":16,\"{\":17,\"}\":18,\"JSONMemberList\":19,\"JSONMember\":20,\":\":21,\",\":22,\"[\":23,\"]\":24,\"JSONElementList\":25,\"$accept\":0,\"$end\":1},\nterminals_: {2:\"error\",4:\"STRING\",6:\"NUMBER\",8:\"NULL\",10:\"TRUE\",11:\"FALSE\",14:\"EOF\",17:\"{\",18:\"}\",21:\":\",22:\",\",23:\"[\",24:\"]\"},\nproductions_: [0,[3,1],[5,1],[7,1],[9,1],[9,1],[12,2],[13,1],[13,1],[13,1],[13,1],[13,1],[13,1],[15,2],[15,3],[20,3],[19,1],[19,3],[16,2],[16,3],[25,1],[25,3]],\nperformAction: function anonymous(yytext, yyleng, yylineno, yy, yystate /* action[1] */, $$ /* vstack */, _$ /* lstack */) {\n/* this == yyval */\n\nvar $0 = $$.length - 1;\nswitch (yystate) {\ncase 1:\n // replace escaped characters with actual character\n          this.$ = new String(yytext.replace(/\\\\(\\\\|\")/g, \"$\"+\"1\")\n                     .replace(/\\\\n/g,'\\n')\n                     .replace(/\\\\r/g,'\\r')\n                     .replace(/\\\\t/g,'\\t')\n                     .replace(/\\\\v/g,'\\v')\n                     .replace(/\\\\f/g,'\\f')\n                     .replace(/\\\\b/g,'\\b'));\n          this.$.__line__ =  this._$.first_line;\n        \nbreak;\ncase 2:\n\n            this.$ = new Number(yytext);\n            this.$.__line__ =  this._$.first_line;\n        \nbreak;\ncase 3:\n\n            this.$ = null;\n        \nbreak;\ncase 4:\n\n            this.$ = new Boolean(true);\n            this.$.__line__ = this._$.first_line;\n        \nbreak;\ncase 5:\n\n            this.$ = new Boolean(false);\n            this.$.__line__ = this._$.first_line;\n        \nbreak;\ncase 6:\nreturn this.$ = $$[$0-1];\nbreak;\ncase 13:\nthis.$ = {}; Object.defineProperty(this.$, '__line__', {\n            value: this._$.first_line,\n            enumerable: false\n        })\nbreak;\ncase 14: case 19:\nthis.$ = $$[$0-1]; Object.defineProperty(this.$, '__line__', {\n            value: this._$.first_line,\n            enumerable: false\n        })\nbreak;\ncase 15:\nthis.$ = [$$[$0-2], $$[$0]];\nbreak;\ncase 16:\nthis.$ = {}; this.$[$$[$0][0]] = $$[$0][1];\nbreak;\ncase 17:\nthis.$ = $$[$0-2]; $$[$0-2][$$[$0][0]] = $$[$0][1];\nbreak;\ncase 18:\nthis.$ = []; Object.defineProperty(this.$, '__line__', {\n            value: this._$.first_line,\n            enumerable: false\n        })\nbreak;\ncase 20:\nthis.$ = [$$[$0]];\nbreak;\ncase 21:\nthis.$ = $$[$0-2]; $$[$0-2].push($$[$0]);\nbreak;\n}\n},\ntable: [{3:5,4:$V0,5:6,6:$V1,7:3,8:$V2,9:4,10:$V3,11:$V4,12:1,13:2,15:7,16:8,17:$V5,23:$V6},{1:[3]},{14:[1,16]},o($V7,[2,7]),o($V7,[2,8]),o($V7,[2,9]),o($V7,[2,10]),o($V7,[2,11]),o($V7,[2,12]),o($V7,[2,3]),o($V7,[2,4]),o($V7,[2,5]),o([14,18,21,22,24],[2,1]),o($V7,[2,2]),{3:20,4:$V0,18:[1,17],19:18,20:19},{3:5,4:$V0,5:6,6:$V1,7:3,8:$V2,9:4,10:$V3,11:$V4,13:23,15:7,16:8,17:$V5,23:$V6,24:[1,21],25:22},{1:[2,6]},o($V7,[2,13]),{18:[1,24],22:[1,25]},o($V8,[2,16]),{21:[1,26]},o($V7,[2,18]),{22:[1,28],24:[1,27]},o($V9,[2,20]),o($V7,[2,14]),{3:20,4:$V0,20:29},{3:5,4:$V0,5:6,6:$V1,7:3,8:$V2,9:4,10:$V3,11:$V4,13:30,15:7,16:8,17:$V5,23:$V6},o($V7,[2,19]),{3:5,4:$V0,5:6,6:$V1,7:3,8:$V2,9:4,10:$V3,11:$V4,13:31,15:7,16:8,17:$V5,23:$V6},o($V8,[2,17]),o($V8,[2,15]),o($V9,[2,21])],\ndefaultActions: {16:[2,6]},\nparseError: function parseError(str, hash) {\n    if (hash.recoverable) {\n        this.trace(str);\n    } else {\n        throw new Error(str);\n    }\n},\nparse: function parse(input) {\n    var self = this, stack = [0], tstack = [], vstack = [null], lstack = [], table = this.table, yytext = '', yylineno = 0, yyleng = 0, recovering = 0, TERROR = 2, EOF = 1;\n    var args = lstack.slice.call(arguments, 1);\n    var lexer = Object.create(this.lexer);\n    var sharedState = { yy: {} };\n    for (var k in this.yy) {\n        if (Object.prototype.hasOwnProperty.call(this.yy, k)) {\n            sharedState.yy[k] = this.yy[k];\n        }\n    }\n    lexer.setInput(input, sharedState.yy);\n    sharedState.yy.lexer = lexer;\n    sharedState.yy.parser = this;\n    if (typeof lexer.yylloc == 'undefined') {\n        lexer.yylloc = {};\n    }\n    var yyloc = lexer.yylloc;\n    lstack.push(yyloc);\n    var ranges = lexer.options && lexer.options.ranges;\n    if (typeof sharedState.yy.parseError === 'function') {\n        this.parseError = sharedState.yy.parseError;\n    } else {\n        this.parseError = Object.getPrototypeOf(this).parseError;\n    }\n    function popStack(n) {\n        stack.length = stack.length - 2 * n;\n        vstack.length = vstack.length - n;\n        lstack.length = lstack.length - n;\n    }\n    _token_stack:\n        function lex() {\n            var token;\n            token = lexer.lex() || EOF;\n            if (typeof token !== 'number') {\n                token = self.symbols_[token] || token;\n            }\n            return token;\n        }\n    var symbol, preErrorSymbol, state, action, a, r, yyval = {}, p, len, newState, expected;\n    while (true) {\n        state = stack[stack.length - 1];\n        if (this.defaultActions[state]) {\n            action = this.defaultActions[state];\n        } else {\n            if (symbol === null || typeof symbol == 'undefined') {\n                symbol = lex();\n            }\n            action = table[state] && table[state][symbol];\n        }\n                    if (typeof action === 'undefined' || !action.length || !action[0]) {\n                var errStr = '';\n                expected = [];\n                for (p in table[state]) {\n                    if (this.terminals_[p] && p > TERROR) {\n                        expected.push('\\'' + this.terminals_[p] + '\\'');\n                    }\n                }\n                if (lexer.showPosition) {\n                    errStr = 'Parse error on line ' + (yylineno + 1) + ':\\n' + lexer.showPosition() + '\\nExpecting ' + expected.join(', ') + ', got \\'' + (this.terminals_[symbol] || symbol) + '\\'';\n                } else {\n                    errStr = 'Parse error on line ' + (yylineno + 1) + ': Unexpected ' + (symbol == EOF ? 'end of input' : '\\'' + (this.terminals_[symbol] || symbol) + '\\'');\n                }\n                this.parseError(errStr, {\n                    text: lexer.match,\n                    token: this.terminals_[symbol] || symbol,\n                    line: lexer.yylineno,\n                    loc: yyloc,\n                    expected: expected\n                });\n            }\n        if (action[0] instanceof Array && action.length > 1) {\n            throw new Error('Parse Error: multiple actions possible at state: ' + state + ', token: ' + symbol);\n        }\n        switch (action[0]) {\n        case 1:\n            stack.push(symbol);\n            vstack.push(lexer.yytext);\n            lstack.push(lexer.yylloc);\n            stack.push(action[1]);\n            symbol = null;\n            if (!preErrorSymbol) {\n                yyleng = lexer.yyleng;\n                yytext = lexer.yytext;\n                yylineno = lexer.yylineno;\n                yyloc = lexer.yylloc;\n                if (recovering > 0) {\n                    recovering--;\n                }\n            } else {\n                symbol = preErrorSymbol;\n                preErrorSymbol = null;\n            }\n            break;\n        case 2:\n            len = this.productions_[action[1]][1];\n            yyval.$ = vstack[vstack.length - len];\n            yyval._$ = {\n                first_line: lstack[lstack.length - (len || 1)].first_line,\n                last_line: lstack[lstack.length - 1].last_line,\n                first_column: lstack[lstack.length - (len || 1)].first_column,\n                last_column: lstack[lstack.length - 1].last_column\n            };\n            if (ranges) {\n                yyval._$.range = [\n                    lstack[lstack.length - (len || 1)].range[0],\n                    lstack[lstack.length - 1].range[1]\n                ];\n            }\n            r = this.performAction.apply(yyval, [\n                yytext,\n                yyleng,\n                yylineno,\n                sharedState.yy,\n                action[1],\n                vstack,\n                lstack\n            ].concat(args));\n            if (typeof r !== 'undefined') {\n                return r;\n            }\n            if (len) {\n                stack = stack.slice(0, -1 * len * 2);\n                vstack = vstack.slice(0, -1 * len);\n                lstack = lstack.slice(0, -1 * len);\n            }\n            stack.push(this.productions_[action[1]][0]);\n            vstack.push(yyval.$);\n            lstack.push(yyval._$);\n            newState = table[stack[stack.length - 2]][stack[stack.length - 1]];\n            stack.push(newState);\n            break;\n        case 3:\n            return true;\n        }\n    }\n    return true;\n}};\n/* generated by jison-lex 0.3.4 */\nvar lexer = (function(){\nvar lexer = ({\n\nEOF:1,\n\nparseError:function parseError(str, hash) {\n        if (this.yy.parser) {\n            this.yy.parser.parseError(str, hash);\n        } else {\n            throw new Error(str);\n        }\n    },\n\n// resets the lexer, sets new input\nsetInput:function (input, yy) {\n        this.yy = yy || this.yy || {};\n        this._input = input;\n        this._more = this._backtrack = this.done = false;\n        this.yylineno = this.yyleng = 0;\n        this.yytext = this.matched = this.match = '';\n        this.conditionStack = ['INITIAL'];\n        this.yylloc = {\n            first_line: 1,\n            first_column: 0,\n            last_line: 1,\n            last_column: 0\n        };\n        if (this.options.ranges) {\n            this.yylloc.range = [0,0];\n        }\n        this.offset = 0;\n        return this;\n    },\n\n// consumes and returns one char from the input\ninput:function () {\n        var ch = this._input[0];\n        this.yytext += ch;\n        this.yyleng++;\n        this.offset++;\n        this.match += ch;\n        this.matched += ch;\n        var lines = ch.match(/(?:\\r\\n?|\\n).*/g);\n        if (lines) {\n            this.yylineno++;\n            this.yylloc.last_line++;\n        } else {\n            this.yylloc.last_column++;\n        }\n        if (this.options.ranges) {\n            this.yylloc.range[1]++;\n        }\n\n        this._input = this._input.slice(1);\n        return ch;\n    },\n\n// unshifts one char (or a string) into the input\nunput:function (ch) {\n        var len = ch.length;\n        var lines = ch.split(/(?:\\r\\n?|\\n)/g);\n\n        this._input = ch + this._input;\n        this.yytext = this.yytext.substr(0, this.yytext.length - len);\n        //this.yyleng -= len;\n        this.offset -= len;\n        var oldLines = this.match.split(/(?:\\r\\n?|\\n)/g);\n        this.match = this.match.substr(0, this.match.length - 1);\n        this.matched = this.matched.substr(0, this.matched.length - 1);\n\n        if (lines.length - 1) {\n            this.yylineno -= lines.length - 1;\n        }\n        var r = this.yylloc.range;\n\n        this.yylloc = {\n            first_line: this.yylloc.first_line,\n            last_line: this.yylineno + 1,\n            first_column: this.yylloc.first_column,\n            last_column: lines ?\n                (lines.length === oldLines.length ? this.yylloc.first_column : 0)\n                 + oldLines[oldLines.length - lines.length].length - lines[0].length :\n              this.yylloc.first_column - len\n        };\n\n        if (this.options.ranges) {\n            this.yylloc.range = [r[0], r[0] + this.yyleng - len];\n        }\n        this.yyleng = this.yytext.length;\n        return this;\n    },\n\n// When called from action, caches matched text and appends it on next action\nmore:function () {\n        this._more = true;\n        return this;\n    },\n\n// When called from action, signals the lexer that this rule fails to match the input, so the next matching rule (regex) should be tested instead.\nreject:function () {\n        if (this.options.backtrack_lexer) {\n            this._backtrack = true;\n        } else {\n            return this.parseError('Lexical error on line ' + (this.yylineno + 1) + '. You can only invoke reject() in the lexer when the lexer is of the backtracking persuasion (options.backtrack_lexer = true).\\n' + this.showPosition(), {\n                text: \"\",\n                token: null,\n                line: this.yylineno\n            });\n\n        }\n        return this;\n    },\n\n// retain first n characters of the match\nless:function (n) {\n        this.unput(this.match.slice(n));\n    },\n\n// displays already matched input, i.e. for error messages\npastInput:function () {\n        var past = this.matched.substr(0, this.matched.length - this.match.length);\n        return (past.length > 20 ? '...':'') + past.substr(-20).replace(/\\n/g, \"\");\n    },\n\n// displays upcoming input, i.e. for error messages\nupcomingInput:function () {\n        var next = this.match;\n        if (next.length < 20) {\n            next += this._input.substr(0, 20-next.length);\n        }\n        return (next.substr(0,20) + (next.length > 20 ? '...' : '')).replace(/\\n/g, \"\");\n    },\n\n// displays the character position where the lexing error occurred, i.e. for error messages\nshowPosition:function () {\n        var pre = this.pastInput();\n        var c = new Array(pre.length + 1).join(\"-\");\n        return pre + this.upcomingInput() + \"\\n\" + c + \"^\";\n    },\n\n// test the lexed token: return FALSE when not a match, otherwise return token\ntest_match:function (match, indexed_rule) {\n        var token,\n            lines,\n            backup;\n\n        if (this.options.backtrack_lexer) {\n            // save context\n            backup = {\n                yylineno: this.yylineno,\n                yylloc: {\n                    first_line: this.yylloc.first_line,\n                    last_line: this.last_line,\n                    first_column: this.yylloc.first_column,\n                    last_column: this.yylloc.last_column\n                },\n                yytext: this.yytext,\n                match: this.match,\n                matches: this.matches,\n                matched: this.matched,\n                yyleng: this.yyleng,\n                offset: this.offset,\n                _more: this._more,\n                _input: this._input,\n                yy: this.yy,\n                conditionStack: this.conditionStack.slice(0),\n                done: this.done\n            };\n            if (this.options.ranges) {\n                backup.yylloc.range = this.yylloc.range.slice(0);\n            }\n        }\n\n        lines = match[0].match(/(?:\\r\\n?|\\n).*/g);\n        if (lines) {\n            this.yylineno += lines.length;\n        }\n        this.yylloc = {\n            first_line: this.yylloc.last_line,\n            last_line: this.yylineno + 1,\n            first_column: this.yylloc.last_column,\n            last_column: lines ?\n                         lines[lines.length - 1].length - lines[lines.length - 1].match(/\\r?\\n?/)[0].length :\n                         this.yylloc.last_column + match[0].length\n        };\n        this.yytext += match[0];\n        this.match += match[0];\n        this.matches = match;\n        this.yyleng = this.yytext.length;\n        if (this.options.ranges) {\n            this.yylloc.range = [this.offset, this.offset += this.yyleng];\n        }\n        this._more = false;\n        this._backtrack = false;\n        this._input = this._input.slice(match[0].length);\n        this.matched += match[0];\n        token = this.performAction.call(this, this.yy, this, indexed_rule, this.conditionStack[this.conditionStack.length - 1]);\n        if (this.done && this._input) {\n            this.done = false;\n        }\n        if (token) {\n            return token;\n        } else if (this._backtrack) {\n            // recover context\n            for (var k in backup) {\n                this[k] = backup[k];\n            }\n            return false; // rule action called reject() implying the next rule should be tested instead.\n        }\n        return false;\n    },\n\n// return next match in input\nnext:function () {\n        if (this.done) {\n            return this.EOF;\n        }\n        if (!this._input) {\n            this.done = true;\n        }\n\n        var token,\n            match,\n            tempMatch,\n            index;\n        if (!this._more) {\n            this.yytext = '';\n            this.match = '';\n        }\n        var rules = this._currentRules();\n        for (var i = 0; i < rules.length; i++) {\n            tempMatch = this._input.match(this.rules[rules[i]]);\n            if (tempMatch && (!match || tempMatch[0].length > match[0].length)) {\n                match = tempMatch;\n                index = i;\n                if (this.options.backtrack_lexer) {\n                    token = this.test_match(tempMatch, rules[i]);\n                    if (token !== false) {\n                        return token;\n                    } else if (this._backtrack) {\n                        match = false;\n                        continue; // rule action called reject() implying a rule MISmatch.\n                    } else {\n                        // else: this is a lexer rule which consumes input without producing a token (e.g. whitespace)\n                        return false;\n                    }\n                } else if (!this.options.flex) {\n                    break;\n                }\n            }\n        }\n        if (match) {\n            token = this.test_match(match, rules[index]);\n            if (token !== false) {\n                return token;\n            }\n            // else: this is a lexer rule which consumes input without producing a token (e.g. whitespace)\n            return false;\n        }\n        if (this._input === \"\") {\n            return this.EOF;\n        } else {\n            return this.parseError('Lexical error on line ' + (this.yylineno + 1) + '. Unrecognized text.\\n' + this.showPosition(), {\n                text: \"\",\n                token: null,\n                line: this.yylineno\n            });\n        }\n    },\n\n// return next match that has a token\nlex:function lex() {\n        var r = this.next();\n        if (r) {\n            return r;\n        } else {\n            return this.lex();\n        }\n    },\n\n// activates a new lexer condition state (pushes the new lexer condition state onto the condition stack)\nbegin:function begin(condition) {\n        this.conditionStack.push(condition);\n    },\n\n// pop the previously active lexer condition state off the condition stack\npopState:function popState() {\n        var n = this.conditionStack.length - 1;\n        if (n > 0) {\n            return this.conditionStack.pop();\n        } else {\n            return this.conditionStack[0];\n        }\n    },\n\n// produce the lexer rule set which is active for the currently active lexer condition state\n_currentRules:function _currentRules() {\n        if (this.conditionStack.length && this.conditionStack[this.conditionStack.length - 1]) {\n            return this.conditions[this.conditionStack[this.conditionStack.length - 1]].rules;\n        } else {\n            return this.conditions[\"INITIAL\"].rules;\n        }\n    },\n\n// return the currently active lexer condition state; when an index argument is provided it produces the N-th previous condition state, if available\ntopState:function topState(n) {\n        n = this.conditionStack.length - 1 - Math.abs(n || 0);\n        if (n >= 0) {\n            return this.conditionStack[n];\n        } else {\n            return \"INITIAL\";\n        }\n    },\n\n// alias for begin(condition)\npushState:function pushState(condition) {\n        this.begin(condition);\n    },\n\n// return the number of states currently on the stack\nstateStackSize:function stateStackSize() {\n        return this.conditionStack.length;\n    },\noptions: {},\nperformAction: function anonymous(yy,yy_,$avoiding_name_collisions,YY_START) {\nvar YYSTATE=YY_START;\nswitch($avoiding_name_collisions) {\ncase 0:/* skip whitespace */\nbreak;\ncase 1:return 6\nbreak;\ncase 2:yy_.yytext = yy_.yytext.substr(1,yy_.yyleng-2); return 4\nbreak;\ncase 3:return 17\nbreak;\ncase 4:return 18\nbreak;\ncase 5:return 23\nbreak;\ncase 6:return 24\nbreak;\ncase 7:return 22\nbreak;\ncase 8:return 21\nbreak;\ncase 9:return 10\nbreak;\ncase 10:return 11\nbreak;\ncase 11:return 8\nbreak;\ncase 12:return 14\nbreak;\ncase 13:return 'INVALID'\nbreak;\n}\n},\nrules: [/^(?:\\s+)/,/^(?:(-?([0-9]|[1-9][0-9]+))(\\.[0-9]+)?([eE][-+]?[0-9]+)?\\b)/,/^(?:\"(?:\\\\[\\\\\"bfnrt/]|\\\\u[a-fA-F0-9]{4}|[^\\\\\\0-\\x09\\x0a-\\x1f\"])*\")/,/^(?:\\{)/,/^(?:\\})/,/^(?:\\[)/,/^(?:\\])/,/^(?:,)/,/^(?::)/,/^(?:true\\b)/,/^(?:false\\b)/,/^(?:null\\b)/,/^(?:$)/,/^(?:.)/],\nconditions: {\"INITIAL\":{\"rules\":[0,1,2,3,4,5,6,7,8,9,10,11,12,13],\"inclusive\":true}}\n});\nreturn lexer;\n})();\nparser.lexer = lexer;\nfunction Parser () {\n  this.yy = {};\n}\nParser.prototype = parser;parser.Parser = Parser;\nreturn new Parser;\n})();\n\n\nif (typeof require !== 'undefined' && typeof exports !== 'undefined') {\nexports.parser = parser;\nexports.Parser = parser.Parser;\nexports.parse = function () { return parser.parse.apply(parser, arguments); };\n}\n","\nimport validateStyleMin from './validate_style.min';\nimport ParsingError from './error/parsing_error';\nimport jsonlint from '@mapbox/jsonlint-lines-primitives';\nimport {v8} from './style-spec';\n\n/**\n * Validate a Mapbox GL style against the style specification.\n *\n * @private\n * @alias validate\n * @param {Object|String|Buffer} style The style to be validated. If a `String`\n *     or `Buffer` is provided, the returned errors will contain line numbers.\n * @param {Object} [styleSpec] The style specification to validate against.\n *     If omitted, the spec version is inferred from the stylesheet.\n * @returns {Array<ValidationError|ParsingError>}\n * @example\n *   var validate = require('mapbox-gl-style-spec').validate;\n *   var style = fs.readFileSync('./style.json', 'utf8');\n *   var errors = validate(style);\n */\n\nexport default function validateStyle(style, styleSpec) {\n    if (style instanceof String || typeof style === 'string' || style instanceof Buffer) {\n        try {\n            style = jsonlint.parse(style.toString());\n        } catch (e) {\n            return [new ParsingError(e)];\n        }\n    }\n\n    styleSpec = styleSpec || v8;\n\n    return validateStyleMin(style, styleSpec);\n}\n\nexport const source = validateStyleMin.source;\nexport const light = validateStyleMin.light;\nexport const layer = validateStyleMin.layer;\nexport const filter = validateStyleMin.filter;\nexport const paintProperty = validateStyleMin.paintProperty;\nexport const layoutProperty = validateStyleMin.layoutProperty;\n","// @flow\n\ntype ExpressionType = 'data-driven' | 'cross-faded' | 'cross-faded-data-driven' | 'color-ramp' | 'data-constant' | 'constant';\ntype ExpressionParameters = Array<'zoom' | 'feature' | 'feature-state' | 'heatmap-density' | 'line-progress'>;\n\ntype ExpressionSpecification = {\n    interpolated: boolean,\n    parameters: ExpressionParameters\n}\n\nexport type StylePropertySpecification = {\n    type: 'number',\n    'property-type': ExpressionType,\n    expression?: ExpressionSpecification,\n    transition: boolean,\n    default?: number\n} | {\n    type: 'string',\n    'property-type': ExpressionType,\n    expression?: ExpressionSpecification,\n    transition: boolean,\n    default?: string,\n    tokens?: boolean\n} | {\n    type: 'boolean',\n    'property-type': ExpressionType,\n    expression?: ExpressionSpecification,\n    transition: boolean,\n    default?: boolean\n} | {\n    type: 'enum',\n    'property-type': ExpressionType,\n    expression?: ExpressionSpecification,\n    values: {[string]: {}},\n    transition: boolean,\n    default?: string\n} | {\n    type: 'color',\n    'property-type': ExpressionType,\n    expression?: ExpressionSpecification,\n    transition: boolean,\n    default?: string\n} | {\n    type: 'array',\n    value: 'number',\n    'property-type': ExpressionType,\n    expression?: ExpressionSpecification,\n    length?: number,\n    transition: boolean,\n    default?: Array<number>\n} | {\n    type: 'array',\n    value: 'string',\n    'property-type': ExpressionType,\n    expression?: ExpressionSpecification,\n    length?: number,\n    transition: boolean,\n    default?: Array<string>\n};\n\nimport v8 from './reference/v8.json';\nimport latest from './reference/latest';\nimport format from './format';\nimport migrate from './migrate';\nimport composite from './composite';\nimport diff from './diff';\nimport ValidationError from './error/validation_error';\nimport ParsingError from './error/parsing_error';\nimport { StyleExpression, isExpression, createExpression, createPropertyExpression, normalizePropertyExpression, ZoomConstantExpression, ZoomDependentExpression, StylePropertyFunction } from './expression';\nimport featureFilter from './feature_filter';\nimport Color from './util/color';\nimport { createFunction, isFunction } from './function';\nimport convertFunction from './function/convert';\nimport { eachSource, eachLayer, eachProperty } from './visit';\n\nimport validate from './validate_style';\n\nconst expression = {\n    StyleExpression,\n    isExpression,\n    createExpression,\n    createPropertyExpression,\n    normalizePropertyExpression,\n    ZoomConstantExpression,\n    ZoomDependentExpression,\n    StylePropertyFunction\n};\n\nconst styleFunction = {\n    convertFunction,\n    createFunction,\n    isFunction\n};\n\nconst visit = { eachSource, eachLayer, eachProperty };\n\nexport {\n    v8,\n    latest,\n    format,\n    migrate,\n    composite,\n    diff,\n    ValidationError,\n    ParsingError,\n    expression,\n    featureFilter,\n    Color,\n    styleFunction as function,\n    validate,\n    visit\n};\n\nvalidate.parsed = validate;\nvalidate.latest = validate;\n","// @flow\n\nimport {\n    eachLayer,\n    eachProperty\n} from '../visit';\nimport { isExpression } from '../expression';\nimport convertFunction, {convertTokenString} from '../function/convert';\nimport convertFilter from '../feature_filter/convert';\n\nimport type { StyleSpecification } from '../types';\n\n/**\n * Migrate the given style object in place to use expressions. Specifically,\n * this will convert (a) \"stop\" functions, and (b) legacy filters to their\n * expression equivalents.\n */\nexport default function(style: StyleSpecification) {\n    const converted = [];\n\n    eachLayer(style, (layer) => {\n        if (layer.filter) {\n            layer.filter = (convertFilter(layer.filter): any);\n        }\n    });\n\n    eachProperty(style, {paint: true, layout: true}, ({path, value, reference, set}) => {\n        if (isExpression(value)) return;\n        if (typeof value === 'object' && !Array.isArray(value)) {\n            set(convertFunction(value, reference));\n            converted.push(path.join('.'));\n        } else if (reference.tokens && typeof value === 'string') {\n            set(convertTokenString(value));\n        }\n    });\n\n    return style;\n}\n\n","\nexport default function (style) {\n    const styleIDs = [];\n    const sourceIDs = [];\n    const compositedSourceLayers = [];\n\n    for (const id in style.sources) {\n        const source = style.sources[id];\n\n        if (source.type !== \"vector\")\n            continue;\n\n        const match = /^mapbox:\\/\\/(.*)/.exec(source.url);\n        if (!match)\n            continue;\n\n        styleIDs.push(id);\n        sourceIDs.push(match[1]);\n    }\n\n    if (styleIDs.length < 2)\n        return style;\n\n    styleIDs.forEach((id) => {\n        delete style.sources[id];\n    });\n\n    const compositeID = sourceIDs.join(\",\");\n\n    style.sources[compositeID] = {\n        \"type\": \"vector\",\n        \"url\": `mapbox://${compositeID}`\n    };\n\n    style.layers.forEach((layer) => {\n        if (styleIDs.indexOf(layer.source) >= 0) {\n            layer.source = compositeID;\n\n            if ('source-layer' in layer) {\n                if (compositedSourceLayers.indexOf(layer['source-layer']) >= 0) {\n                    throw new Error('Conflicting source layer names');\n                } else {\n                    compositedSourceLayers.push(layer['source-layer']);\n                }\n            }\n        }\n    });\n\n    return style;\n}\n","/**\n * @module ol/geom/Geometry\n */\nimport BaseObject from '../Object.js';\nimport {createEmpty, getHeight, returnOrUpdate} from '../extent.js';\nimport {FALSE} from '../functions.js';\nimport {transform2D} from '../geom/flat/transform.js';\nimport {get as getProjection, getTransform} from '../proj.js';\nimport Units from '../proj/Units.js';\nimport {create as createTransform, compose as composeTransform} from '../transform.js';\n\n\n/**\n * @type {module:ol/transform~Transform}\n */\nconst tmpTransform = createTransform();\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * Base class for vector geometries.\n *\n * To get notified of changes to the geometry, register a listener for the\n * generic `change` event on your geometry instance.\n *\n * @abstract\n * @api\n */\nclass Geometry extends BaseObject {\n  constructor() {\n\n    super();\n\n    /**\n     * @private\n     * @type {module:ol/extent~Extent}\n     */\n    this.extent_ = createEmpty();\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.extentRevision_ = -1;\n\n    /**\n     * @protected\n     * @type {Object<string, module:ol/geom/Geometry>}\n     */\n    this.simplifiedGeometryCache = {};\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.simplifiedGeometryMaxMinSquaredTolerance = 0;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.simplifiedGeometryRevision = 0;\n\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @abstract\n   * @return {!module:ol/geom/Geometry} Clone.\n   */\n  clone() {}\n\n  /**\n   * @abstract\n   * @param {number} x X.\n   * @param {number} y Y.\n   * @param {module:ol/coordinate~Coordinate} closestPoint Closest point.\n   * @param {number} minSquaredDistance Minimum squared distance.\n   * @return {number} Minimum squared distance.\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {}\n\n  /**\n   * Return the closest point of the geometry to the passed point as\n   * {@link module:ol/coordinate~Coordinate coordinate}.\n   * @param {module:ol/coordinate~Coordinate} point Point.\n   * @param {module:ol/coordinate~Coordinate=} opt_closestPoint Closest point.\n   * @return {module:ol/coordinate~Coordinate} Closest point.\n   * @api\n   */\n  getClosestPoint(point, opt_closestPoint) {\n    const closestPoint = opt_closestPoint ? opt_closestPoint : [NaN, NaN];\n    this.closestPointXY(point[0], point[1], closestPoint, Infinity);\n    return closestPoint;\n  }\n\n  /**\n   * Returns true if this geometry includes the specified coordinate. If the\n   * coordinate is on the boundary of the geometry, returns false.\n   * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n   * @return {boolean} Contains coordinate.\n   * @api\n   */\n  intersectsCoordinate(coordinate) {\n    return this.containsXY(coordinate[0], coordinate[1]);\n  }\n\n  /**\n   * @abstract\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @protected\n   * @return {module:ol/extent~Extent} extent Extent.\n   */\n  computeExtent(extent) {}\n\n  /**\n   * Get the extent of the geometry.\n   * @param {module:ol/extent~Extent=} opt_extent Extent.\n   * @return {module:ol/extent~Extent} extent Extent.\n   * @api\n   */\n  getExtent(opt_extent) {\n    if (this.extentRevision_ != this.getRevision()) {\n      this.extent_ = this.computeExtent(this.extent_);\n      this.extentRevision_ = this.getRevision();\n    }\n    return returnOrUpdate(this.extent_, opt_extent);\n  }\n\n  /**\n   * Rotate the geometry around a given coordinate. This modifies the geometry\n   * coordinates in place.\n   * @abstract\n   * @param {number} angle Rotation angle in radians.\n   * @param {module:ol/coordinate~Coordinate} anchor The rotation center.\n   * @api\n   */\n  rotate(angle, anchor) {}\n\n  /**\n   * Scale the geometry (with an optional origin).  This modifies the geometry\n   * coordinates in place.\n   * @abstract\n   * @param {number} sx The scaling factor in the x-direction.\n   * @param {number=} opt_sy The scaling factor in the y-direction (defaults to\n   *     sx).\n   * @param {module:ol/coordinate~Coordinate=} opt_anchor The scale origin (defaults to the center\n   *     of the geometry extent).\n   * @api\n   */\n  scale(sx, opt_sy, opt_anchor) {}\n\n  /**\n   * Create a simplified version of this geometry.  For linestrings, this uses\n   * the the {@link\n   * https://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm\n   * Douglas Peucker} algorithm.  For polygons, a quantization-based\n   * simplification is used to preserve topology.\n   * @function\n   * @param {number} tolerance The tolerance distance for simplification.\n   * @return {module:ol/geom/Geometry} A new, simplified version of the original\n   *     geometry.\n   * @api\n   */\n  simplify(tolerance) {\n    return this.getSimplifiedGeometry(tolerance * tolerance);\n  }\n\n  /**\n   * Create a simplified version of this geometry using the Douglas Peucker\n   * algorithm.\n   * See https://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm.\n   * @abstract\n   * @param {number} squaredTolerance Squared tolerance.\n   * @return {module:ol/geom/Geometry} Simplified geometry.\n   */\n  getSimplifiedGeometry(squaredTolerance) {}\n\n  /**\n   * Get the type of this geometry.\n   * @abstract\n   * @return {module:ol/geom/GeometryType} Geometry type.\n   */\n  getType() {}\n\n  /**\n   * Apply a transform function to each coordinate of the geometry.\n   * The geometry is modified in place.\n   * If you do not want the geometry modified in place, first `clone()` it and\n   * then use this function on the clone.\n   * @abstract\n   * @param {module:ol/proj~TransformFunction} transformFn Transform.\n   */\n  applyTransform(transformFn) {}\n\n  /**\n   * Test if the geometry and the passed extent intersect.\n   * @abstract\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @return {boolean} `true` if the geometry and the extent intersect.\n   */\n  intersectsExtent(extent) {}\n\n  /**\n   * Translate the geometry.  This modifies the geometry coordinates in place.  If\n   * instead you want a new geometry, first `clone()` this geometry.\n   * @abstract\n   * @param {number} deltaX Delta X.\n   * @param {number} deltaY Delta Y.\n   * @api\n   */\n  translate(deltaX, deltaY) {}\n\n  /**\n   * Transform each coordinate of the geometry from one coordinate reference\n   * system to another. The geometry is modified in place.\n   * For example, a line will be transformed to a line and a circle to a circle.\n   * If you do not want the geometry modified in place, first `clone()` it and\n   * then use this function on the clone.\n   *\n   * @param {module:ol/proj~ProjectionLike} source The current projection.  Can be a\n   *     string identifier or a {@link module:ol/proj/Projection~Projection} object.\n   * @param {module:ol/proj~ProjectionLike} destination The desired projection.  Can be a\n   *     string identifier or a {@link module:ol/proj/Projection~Projection} object.\n   * @return {module:ol/geom/Geometry} This geometry.  Note that original geometry is\n   *     modified in place.\n   * @api\n   */\n  transform(source, destination) {\n    source = getProjection(source);\n    const transformFn = source.getUnits() == Units.TILE_PIXELS ?\n      function(inCoordinates, outCoordinates, stride) {\n        const pixelExtent = source.getExtent();\n        const projectedExtent = source.getWorldExtent();\n        const scale = getHeight(projectedExtent) / getHeight(pixelExtent);\n        composeTransform(tmpTransform,\n          projectedExtent[0], projectedExtent[3],\n          scale, -scale, 0,\n          0, 0);\n        transform2D(inCoordinates, 0, inCoordinates.length, stride,\n          tmpTransform, outCoordinates);\n        return getTransform(source, destination)(inCoordinates, outCoordinates, stride);\n      } :\n      getTransform(source, destination);\n    this.applyTransform(transformFn);\n    return this;\n  }\n}\n\n\n/**\n * @param {number} x X.\n * @param {number} y Y.\n * @return {boolean} Contains (x, y).\n */\nGeometry.prototype.containsXY = FALSE;\n\n\nexport default Geometry;\n","/**\n * @module ol/geom/flat/intersectsextent\n */\nimport {containsExtent, createEmpty, extendFlatCoordinates, intersects, intersectsSegment} from '../../extent.js';\nimport {linearRingContainsXY, linearRingContainsExtent} from '../flat/contains.js';\nimport {forEach as forEachSegment} from '../flat/segments.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {boolean} True if the geometry and the extent intersect.\n */\nexport function intersectsLineString(flatCoordinates, offset, end, stride, extent) {\n  const coordinatesExtent = extendFlatCoordinates(\n    createEmpty(), flatCoordinates, offset, end, stride);\n  if (!intersects(extent, coordinatesExtent)) {\n    return false;\n  }\n  if (containsExtent(extent, coordinatesExtent)) {\n    return true;\n  }\n  if (coordinatesExtent[0] >= extent[0] &&\n      coordinatesExtent[2] <= extent[2]) {\n    return true;\n  }\n  if (coordinatesExtent[1] >= extent[1] &&\n      coordinatesExtent[3] <= extent[3]) {\n    return true;\n  }\n  return forEachSegment(flatCoordinates, offset, end, stride,\n    /**\n     * @param {module:ol/coordinate~Coordinate} point1 Start point.\n     * @param {module:ol/coordinate~Coordinate} point2 End point.\n     * @return {boolean} `true` if the segment and the extent intersect,\n     *     `false` otherwise.\n     */\n    function(point1, point2) {\n      return intersectsSegment(extent, point1, point2);\n    });\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {boolean} True if the geometry and the extent intersect.\n */\nexport function intersectsLineStringArray(flatCoordinates, offset, ends, stride, extent) {\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    if (intersectsLineString(\n      flatCoordinates, offset, ends[i], stride, extent)) {\n      return true;\n    }\n    offset = ends[i];\n  }\n  return false;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {boolean} True if the geometry and the extent intersect.\n */\nexport function intersectsLinearRing(flatCoordinates, offset, end, stride, extent) {\n  if (intersectsLineString(\n    flatCoordinates, offset, end, stride, extent)) {\n    return true;\n  }\n  if (linearRingContainsXY(flatCoordinates, offset, end, stride, extent[0], extent[1])) {\n    return true;\n  }\n  if (linearRingContainsXY(flatCoordinates, offset, end, stride, extent[0], extent[3])) {\n    return true;\n  }\n  if (linearRingContainsXY(flatCoordinates, offset, end, stride, extent[2], extent[1])) {\n    return true;\n  }\n  if (linearRingContainsXY(flatCoordinates, offset, end, stride, extent[2], extent[3])) {\n    return true;\n  }\n  return false;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {boolean} True if the geometry and the extent intersect.\n */\nexport function intersectsLinearRingArray(flatCoordinates, offset, ends, stride, extent) {\n  if (!intersectsLinearRing(\n    flatCoordinates, offset, ends[0], stride, extent)) {\n    return false;\n  }\n  if (ends.length === 1) {\n    return true;\n  }\n  for (let i = 1, ii = ends.length; i < ii; ++i) {\n    if (linearRingContainsExtent(flatCoordinates, ends[i - 1], ends[i], stride, extent)) {\n      return false;\n    }\n  }\n  return true;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {boolean} True if the geometry and the extent intersect.\n */\nexport function intersectsLinearRingMultiArray(flatCoordinates, offset, endss, stride, extent) {\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    if (intersectsLinearRingArray(\n      flatCoordinates, offset, ends, stride, extent)) {\n      return true;\n    }\n    offset = ends[ends.length - 1];\n  }\n  return false;\n}\n","/**\n * @module ol/Observable\n */\nimport {listen, unlistenByKey, unlisten, listenOnce} from './events.js';\nimport EventTarget from './events/Target.js';\nimport EventType from './events/EventType.js';\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * An event target providing convenient methods for listener registration\n * and unregistration. A generic `change` event is always available through\n * {@link module:ol/Observable~Observable#changed}.\n *\n * @fires module:ol/events/Event~Event\n * @api\n */\nclass Observable extends EventTarget {\n  constructor() {\n\n    super();\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.revision_ = 0;\n\n  }\n\n  /**\n   * Increases the revision counter and dispatches a 'change' event.\n   * @api\n   */\n  changed() {\n    ++this.revision_;\n    this.dispatchEvent(EventType.CHANGE);\n  }\n\n  /**\n   * Get the version number for this object.  Each time the object is modified,\n   * its version number will be incremented.\n   * @return {number} Revision.\n   * @api\n   */\n  getRevision() {\n    return this.revision_;\n  }\n\n  /**\n   * Listen for a certain type of event.\n   * @param {string|Array<string>} type The event type or array of event types.\n   * @param {function(?): ?} listener The listener function.\n   * @return {module:ol/events~EventsKey|Array<module:ol/events~EventsKey>} Unique key for the listener. If\n   *     called with an array of event types as the first argument, the return\n   *     will be an array of keys.\n   * @api\n   */\n  on(type, listener) {\n    if (Array.isArray(type)) {\n      const len = type.length;\n      const keys = new Array(len);\n      for (let i = 0; i < len; ++i) {\n        keys[i] = listen(this, type[i], listener);\n      }\n      return keys;\n    } else {\n      return listen(this, /** @type {string} */ (type), listener);\n    }\n  }\n\n  /**\n   * Listen once for a certain type of event.\n   * @param {string|Array<string>} type The event type or array of event types.\n   * @param {function(?): ?} listener The listener function.\n   * @return {module:ol/events~EventsKey|Array<module:ol/events~EventsKey>} Unique key for the listener. If\n   *     called with an array of event types as the first argument, the return\n   *     will be an array of keys.\n   * @api\n   */\n  once(type, listener) {\n    if (Array.isArray(type)) {\n      const len = type.length;\n      const keys = new Array(len);\n      for (let i = 0; i < len; ++i) {\n        keys[i] = listenOnce(this, type[i], listener);\n      }\n      return keys;\n    } else {\n      return listenOnce(this, /** @type {string} */ (type), listener);\n    }\n  }\n\n  /**\n   * Unlisten for a certain type of event.\n   * @param {string|Array<string>} type The event type or array of event types.\n   * @param {function(?): ?} listener The listener function.\n   * @api\n   */\n  un(type, listener) {\n    if (Array.isArray(type)) {\n      for (let i = 0, ii = type.length; i < ii; ++i) {\n        unlisten(this, type[i], listener);\n      }\n      return;\n    } else {\n      unlisten(this, /** @type {string} */ (type), listener);\n    }\n  }\n}\n\n\n/**\n * Removes an event listener using the key returned by `on()` or `once()`.\n * @param {module:ol/events~EventsKey|Array<module:ol/events~EventsKey>} key The key returned by `on()`\n *     or `once()` (or an array of keys).\n * @api\n */\nexport function unByKey(key) {\n  if (Array.isArray(key)) {\n    for (let i = 0, ii = key.length; i < ii; ++i) {\n      unlistenByKey(key[i]);\n    }\n  } else {\n    unlistenByKey(/** @type {module:ol/events~EventsKey} */ (key));\n  }\n}\n\n\nexport default Observable;\n","/**\n * @module ol/format/Feature\n */\nimport Geometry from '../geom/Geometry.js';\nimport {assign} from '../obj.js';\nimport {get as getProjection, equivalent as equivalentProjection, transformExtent} from '../proj.js';\n\n\n/**\n * @typedef {Object} ReadOptions\n * @property {module:ol/proj~ProjectionLike} [dataProjection] Projection of the data we are reading.\n * If not provided, the projection will be derived from the data (where possible) or\n * the `dataProjection` of the format is assigned (where set). If the projection\n * can not be derived from the data and if no `dataProjection` is set for a format,\n * the features will not be reprojected.\n * @property {module:ol/extent~Extent} [extent] Tile extent of the tile being read. This is only used and\n * required for {@link module:ol/format/MVT}.\n * @property {module:ol/proj~ProjectionLike} [featureProjection] Projection of the feature geometries\n * created by the format reader. If not provided, features will be returned in the\n * `dataProjection`.\n */\n\n\n/**\n * @typedef {Object} WriteOptions\n * @property {module:ol/proj~ProjectionLike} [dataProjection] Projection of the data we are writing.\n * If not provided, the `dataProjection` of the format is assigned (where set).\n * If no `dataProjection` is set for a format, the features will be returned\n * in the `featureProjection`.\n * @property {module:ol/proj~ProjectionLike} [featureProjection] Projection of the feature geometries\n * that will be serialized by the format writer. If not provided, geometries are assumed\n * to be in the `dataProjection` if that is set; in other words, they are not transformed.\n * @property {boolean} [rightHanded] When writing geometries, follow the right-hand\n * rule for linear ring orientation.  This means that polygons will have counter-clockwise\n * exterior rings and clockwise interior rings.  By default, coordinates are serialized\n * as they are provided at construction.  If `true`, the right-hand rule will\n * be applied.  If `false`, the left-hand rule will be applied (clockwise for\n * exterior and counter-clockwise for interior rings).  Note that not all\n * formats support this.  The GeoJSON format does use this property when writing\n * geometries.\n * @property {number} [decimals] Maximum number of decimal places for coordinates.\n * Coordinates are stored internally as floats, but floating-point arithmetic can create\n * coordinates with a large number of decimal places, not generally wanted on output.\n * Set a number here to round coordinates. Can also be used to ensure that\n * coordinates read in can be written back out with the same number of decimals.\n * Default is no rounding.\n */\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * Base class for feature formats.\n * {module:ol/format/Feature~FeatureFormat} subclasses provide the ability to decode and encode\n * {@link module:ol/Feature~Feature} objects from a variety of commonly used geospatial\n * file formats.  See the documentation for each format for more details.\n *\n * @abstract\n * @api\n */\nclass FeatureFormat {\n  constructor() {\n\n    /**\n     * @protected\n     * @type {module:ol/proj/Projection}\n     */\n    this.dataProjection = null;\n\n    /**\n     * @protected\n     * @type {module:ol/proj/Projection}\n     */\n    this.defaultFeatureProjection = null;\n\n  }\n\n  /**\n   * Adds the data projection to the read options.\n   * @param {Document|Node|Object|string} source Source.\n   * @param {module:ol/format/Feature~ReadOptions=} opt_options Options.\n   * @return {module:ol/format/Feature~ReadOptions|undefined} Options.\n   * @protected\n   */\n  getReadOptions(source, opt_options) {\n    let options;\n    if (opt_options) {\n      options = {\n        dataProjection: opt_options.dataProjection ?\n          opt_options.dataProjection : this.readProjection(source),\n        featureProjection: opt_options.featureProjection\n      };\n    }\n    return this.adaptOptions(options);\n  }\n\n  /**\n   * Sets the `dataProjection` on the options, if no `dataProjection`\n   * is set.\n   * @param {module:ol/format/Feature~WriteOptions|module:ol/format/Feature~ReadOptions|undefined} options\n   *     Options.\n   * @protected\n   * @return {module:ol/format/Feature~WriteOptions|module:ol/format/Feature~ReadOptions|undefined}\n   *     Updated options.\n   */\n  adaptOptions(options) {\n    return assign({\n      dataProjection: this.dataProjection,\n      featureProjection: this.defaultFeatureProjection\n    }, options);\n  }\n\n  /**\n   * Get the extent from the source of the last {@link readFeatures} call.\n   * @return {module:ol/extent~Extent} Tile extent.\n   */\n  getLastExtent() {\n    return null;\n  }\n\n  /**\n   * @abstract\n   * @return {module:ol/format/FormatType} Format.\n   */\n  getType() {}\n\n  /**\n   * Read a single feature from a source.\n   *\n   * @abstract\n   * @param {Document|Node|Object|string} source Source.\n   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.\n   * @return {module:ol/Feature} Feature.\n   */\n  readFeature(source, opt_options) {}\n\n  /**\n   * Read all features from a source.\n   *\n   * @abstract\n   * @param {Document|Node|ArrayBuffer|Object|string} source Source.\n   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.\n   * @return {Array<module:ol/Feature>} Features.\n   */\n  readFeatures(source, opt_options) {}\n\n  /**\n   * Read a single geometry from a source.\n   *\n   * @abstract\n   * @param {Document|Node|Object|string} source Source.\n   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.\n   * @return {module:ol/geom/Geometry} Geometry.\n   */\n  readGeometry(source, opt_options) {}\n\n  /**\n   * Read the projection from a source.\n   *\n   * @abstract\n   * @param {Document|Node|Object|string} source Source.\n   * @return {module:ol/proj/Projection} Projection.\n   */\n  readProjection(source) {}\n\n  /**\n   * Encode a feature in this format.\n   *\n   * @abstract\n   * @param {module:ol/Feature} feature Feature.\n   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n   * @return {string} Result.\n   */\n  writeFeature(feature, opt_options) {}\n\n  /**\n   * Encode an array of features in this format.\n   *\n   * @abstract\n   * @param {Array<module:ol/Feature>} features Features.\n   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n   * @return {string} Result.\n   */\n  writeFeatures(features, opt_options) {}\n\n  /**\n   * Write a single geometry in this format.\n   *\n   * @abstract\n   * @param {module:ol/geom/Geometry} geometry Geometry.\n   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n   * @return {string} Result.\n   */\n  writeGeometry(geometry, opt_options) {}\n}\n\nexport default FeatureFormat;\n\n/**\n * @param {module:ol/geom/Geometry|module:ol/extent~Extent} geometry Geometry.\n * @param {boolean} write Set to true for writing, false for reading.\n * @param {module:ol/format/Feature~WriteOptions|module:ol/format/Feature~ReadOptions|undefined} opt_options\n *     Options.\n * @return {module:ol/geom/Geometry|module:ol/extent~Extent} Transformed geometry.\n */\nexport function transformWithOptions(geometry, write, opt_options) {\n  const featureProjection = opt_options ?\n    getProjection(opt_options.featureProjection) : null;\n  const dataProjection = opt_options ?\n    getProjection(opt_options.dataProjection) : null;\n  /**\n   * @type {module:ol/geom/Geometry|module:ol/extent~Extent}\n   */\n  let transformed;\n  if (featureProjection && dataProjection &&\n      !equivalentProjection(featureProjection, dataProjection)) {\n    if (geometry instanceof Geometry) {\n      transformed = (write ? geometry.clone() : geometry).transform(\n        write ? featureProjection : dataProjection,\n        write ? dataProjection : featureProjection);\n    } else {\n      // FIXME this is necessary because GML treats extents\n      // as geometries\n      transformed = transformExtent(\n        geometry,\n        dataProjection,\n        featureProjection);\n    }\n  } else {\n    transformed = geometry;\n  }\n  if (write && opt_options && opt_options.decimals !== undefined) {\n    const power = Math.pow(10, opt_options.decimals);\n    // if decimals option on write, round each coordinate appropriately\n    /**\n     * @param {Array<number>} coordinates Coordinates.\n     * @return {Array<number>} Transformed coordinates.\n     */\n    const transform = function(coordinates) {\n      for (let i = 0, ii = coordinates.length; i < ii; ++i) {\n        coordinates[i] = Math.round(coordinates[i] * power) / power;\n      }\n      return coordinates;\n    };\n    if (transformed === geometry) {\n      transformed = transformed.clone();\n    }\n    transformed.applyTransform(transform);\n  }\n  return transformed;\n}\n","/**\n * @module ol/layer/Vector\n */\nimport LayerType from '../LayerType.js';\nimport Layer from '../layer/Layer.js';\nimport VectorRenderType from '../layer/VectorRenderType.js';\nimport {assign} from '../obj.js';\nimport {createDefaultStyle, toFunction as toStyleFunction} from '../style/Style.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [opacity=1] Opacity (0, 1).\n * @property {boolean} [visible=true] Visibility.\n * @property {module:ol/extent~Extent} [extent] The bounding extent for layer rendering.  The layer will not be\n * rendered outside of this extent.\n * @property {number} [zIndex=0] The z-index for layer rendering.  At rendering time, the layers\n * will be ordered, first by Z-index and then by position.\n * @property {number} [minResolution] The minimum resolution (inclusive) at which this layer will be\n * visible.\n * @property {number} [maxResolution] The maximum resolution (exclusive) below which this layer will\n * be visible.\n * @property {module:ol/render~OrderFunction} [renderOrder] Render order. Function to be used when sorting\n * features before rendering. By default features are drawn in the order that they are created. Use\n * `null` to avoid the sort, but get an undefined draw order.\n * @property {number} [renderBuffer=100] The buffer in pixels around the viewport extent used by the\n * renderer when getting features from the vector source for the rendering or hit-detection.\n * Recommended value: the size of the largest symbol, line width or label.\n * @property {module:ol/layer/VectorRenderType|string} [renderMode='vector'] Render mode for vector layers:\n *  * `'image'`: Vector layers are rendered as images. Great performance, but point symbols and\n *    texts are always rotated with the view and pixels are scaled during zoom animations.\n *  * `'vector'`: Vector layers are rendered as vectors. Most accurate rendering even during\n *    animations, but slower performance.\n * @property {module:ol/source/Vector} [source] Source.\n * @property {module:ol/PluggableMap} [map] Sets the layer as overlay on a map. The map will not manage\n * this layer in its layers collection, and the layer will be rendered on top. This is useful for\n * temporary layers. The standard way to add a layer to a map and have it managed by the map is to\n * use {@link module:ol/Map#addLayer}.\n * @property {boolean} [declutter=false] Declutter images and text. Decluttering is applied to all\n * image and text styles, and the priority is defined by the z-index of the style. Lower z-index\n * means higher priority.\n * @property {module:ol/style/Style|Array<module:ol/style/Style>|module:ol/style/Style~StyleFunction} [style] Layer style. See\n * {@link module:ol/style} for default style which will be used if this is not defined.\n * @property {boolean} [updateWhileAnimating=false] When set to `true` and `renderMode`\n * is `vector`, feature batches will be recreated during animations. This means that no\n * vectors will be shown clipped, but the setting will have a performance impact for large\n * amounts of vector data. When set to `false`, batches will be recreated when no animation\n * is active.\n * @property {boolean} [updateWhileInteracting=false] When set to `true` and `renderMode`\n * is `vector`, feature batches will be recreated during interactions. See also\n * `updateWhileAnimating`.\n */\n\n\n/**\n * @enum {string}\n * Render mode for vector layers:\n *  * `'image'`: Vector layers are rendered as images. Great performance, but\n *    point symbols and texts are always rotated with the view and pixels are\n *    scaled during zoom animations.\n *  * `'vector'`: Vector layers are rendered as vectors. Most accurate rendering\n *    even during animations, but slower performance.\n * @api\n */\nexport const RenderType = {\n  IMAGE: 'image',\n  VECTOR: 'vector'\n};\n\n\n/**\n * @enum {string}\n * @private\n */\nconst Property = {\n  RENDER_ORDER: 'renderOrder'\n};\n\n\n/**\n * @classdesc\n * Vector data that is rendered client-side.\n * Note that any property set in the options is set as a {@link module:ol/Object~BaseObject}\n * property on the layer object; for example, setting `title: 'My Title'` in the\n * options means that `title` is observable, and has get/set accessors.\n *\n * @api\n */\nclass VectorLayer extends Layer {\n  /**\n   * @param {module:ol/layer/Vector~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n    const options = opt_options ?\n      opt_options : /** @type {module:ol/layer/Vector~Options} */ ({});\n\n    const baseOptions = assign({}, options);\n\n    delete baseOptions.style;\n    delete baseOptions.renderBuffer;\n    delete baseOptions.updateWhileAnimating;\n    delete baseOptions.updateWhileInteracting;\n    super(baseOptions);\n\n    /**\n    * @private\n    * @type {boolean}\n    */\n    this.declutter_ = options.declutter !== undefined ? options.declutter : false;\n\n    /**\n    * @type {number}\n    * @private\n    */\n    this.renderBuffer_ = options.renderBuffer !== undefined ?\n      options.renderBuffer : 100;\n\n    /**\n    * User provided style.\n    * @type {module:ol/style/Style|Array<module:ol/style/Style>|module:ol/style/Style~StyleFunction}\n    * @private\n    */\n    this.style_ = null;\n\n    /**\n    * Style function for use within the library.\n    * @type {module:ol/style/Style~StyleFunction|undefined}\n    * @private\n    */\n    this.styleFunction_ = undefined;\n\n    this.setStyle(options.style);\n\n    /**\n    * @type {boolean}\n    * @private\n    */\n    this.updateWhileAnimating_ = options.updateWhileAnimating !== undefined ?\n      options.updateWhileAnimating : false;\n\n    /**\n    * @type {boolean}\n    * @private\n    */\n    this.updateWhileInteracting_ = options.updateWhileInteracting !== undefined ?\n      options.updateWhileInteracting : false;\n\n    /**\n    * @private\n    * @type {module:ol/layer/VectorTileRenderType|string}\n    */\n    this.renderMode_ = options.renderMode || VectorRenderType.VECTOR;\n\n    /**\n    * The layer type.\n    * @protected\n    * @type {module:ol/LayerType}\n    */\n    this.type = LayerType.VECTOR;\n\n  }\n\n  /**\n  * @return {boolean} Declutter.\n  */\n  getDeclutter() {\n    return this.declutter_;\n  }\n\n  /**\n  * @param {boolean} declutter Declutter.\n  */\n  setDeclutter(declutter) {\n    this.declutter_ = declutter;\n  }\n\n  /**\n  * @return {number|undefined} Render buffer.\n  */\n  getRenderBuffer() {\n    return this.renderBuffer_;\n  }\n\n  /**\n  * @return {function(module:ol/Feature, module:ol/Feature): number|null|undefined} Render\n  *     order.\n  */\n  getRenderOrder() {\n    return (\n    /** @type {module:ol/render~OrderFunction|null|undefined} */ (this.get(Property.RENDER_ORDER))\n    );\n  }\n\n  /**\n  * Get the style for features.  This returns whatever was passed to the `style`\n  * option at construction or to the `setStyle` method.\n  * @return {module:ol/style/Style|Array<module:ol/style/Style>|module:ol/style/Style~StyleFunction}\n  *     Layer style.\n  * @api\n  */\n  getStyle() {\n    return this.style_;\n  }\n\n  /**\n  * Get the style function.\n  * @return {module:ol/style/Style~StyleFunction|undefined} Layer style function.\n  * @api\n  */\n  getStyleFunction() {\n    return this.styleFunction_;\n  }\n\n  /**\n  * @return {boolean} Whether the rendered layer should be updated while\n  *     animating.\n  */\n  getUpdateWhileAnimating() {\n    return this.updateWhileAnimating_;\n  }\n\n  /**\n  * @return {boolean} Whether the rendered layer should be updated while\n  *     interacting.\n  */\n  getUpdateWhileInteracting() {\n    return this.updateWhileInteracting_;\n  }\n\n  /**\n  * @param {module:ol/render~OrderFunction|null|undefined} renderOrder\n  *     Render order.\n  */\n  setRenderOrder(renderOrder) {\n    this.set(Property.RENDER_ORDER, renderOrder);\n  }\n\n  /**\n  * Set the style for features.  This can be a single style object, an array\n  * of styles, or a function that takes a feature and resolution and returns\n  * an array of styles. If it is `undefined` the default style is used. If\n  * it is `null` the layer has no style (a `null` style), so only features\n  * that have their own styles will be rendered in the layer. See\n  * {@link module:ol/style} for information on the default style.\n  * @param {module:ol/style/Style|Array<module:ol/style/Style>|module:ol/style/Style~StyleFunction|null|undefined} style Layer style.\n  * @api\n  */\n  setStyle(style) {\n    this.style_ = style !== undefined ? style : createDefaultStyle;\n    this.styleFunction_ = style === null ?\n      undefined : toStyleFunction(this.style_);\n    this.changed();\n  }\n\n  /**\n  * @return {module:ol/layer/VectorRenderType|string} The render mode.\n  */\n  getRenderMode() {\n    return this.renderMode_;\n  }\n}\n\n\n/**\n * Return the associated {@link module:ol/source/Vector vectorsource} of the layer.\n * @function\n * @return {module:ol/source/Vector} Source.\n * @api\n */\nVectorLayer.prototype.getSource;\n\n\nexport default VectorLayer;\n","/**\n * @module ol/tilegrid/common\n */\n\n/**\n * Default maximum zoom for default tile grids.\n * @type {number}\n */\nexport const DEFAULT_MAX_ZOOM = 42;\n\n/**\n * Default tile size.\n * @type {number}\n */\nexport const DEFAULT_TILE_SIZE = 256;\n","/**\n * @module ol/geom/flat/interiorpoint\n */\nimport {numberSafeCompareFunction} from '../../array.js';\nimport {linearRingsContainsXY} from '../flat/contains.js';\n\n\n/**\n * Calculates a point that is likely to lie in the interior of the linear rings.\n * Inspired by JTS's com.vividsolutions.jts.geom.Geometry#getInteriorPoint.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {Array<number>} flatCenters Flat centers.\n * @param {number} flatCentersOffset Flat center offset.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Destination point as XYM coordinate, where M is the\n * length of the horizontal intersection that the point belongs to.\n */\nexport function getInteriorPointOfArray(flatCoordinates, offset,\n  ends, stride, flatCenters, flatCentersOffset, opt_dest) {\n  let i, ii, x, x1, x2, y1, y2;\n  const y = flatCenters[flatCentersOffset + 1];\n  /** @type {Array<number>} */\n  const intersections = [];\n  // Calculate intersections with the horizontal line\n  for (let r = 0, rr = ends.length; r < rr; ++r) {\n    const end = ends[r];\n    x1 = flatCoordinates[end - stride];\n    y1 = flatCoordinates[end - stride + 1];\n    for (i = offset; i < end; i += stride) {\n      x2 = flatCoordinates[i];\n      y2 = flatCoordinates[i + 1];\n      if ((y <= y1 && y2 <= y) || (y1 <= y && y <= y2)) {\n        x = (y - y1) / (y2 - y1) * (x2 - x1) + x1;\n        intersections.push(x);\n      }\n      x1 = x2;\n      y1 = y2;\n    }\n  }\n  // Find the longest segment of the horizontal line that has its center point\n  // inside the linear ring.\n  let pointX = NaN;\n  let maxSegmentLength = -Infinity;\n  intersections.sort(numberSafeCompareFunction);\n  x1 = intersections[0];\n  for (i = 1, ii = intersections.length; i < ii; ++i) {\n    x2 = intersections[i];\n    const segmentLength = Math.abs(x2 - x1);\n    if (segmentLength > maxSegmentLength) {\n      x = (x1 + x2) / 2;\n      if (linearRingsContainsXY(flatCoordinates, offset, ends, stride, x, y)) {\n        pointX = x;\n        maxSegmentLength = segmentLength;\n      }\n    }\n    x1 = x2;\n  }\n  if (isNaN(pointX)) {\n    // There is no horizontal line that has its center point inside the linear\n    // ring.  Use the center of the the linear ring's extent.\n    pointX = flatCenters[flatCentersOffset];\n  }\n  if (opt_dest) {\n    opt_dest.push(pointX, y, maxSegmentLength);\n    return opt_dest;\n  } else {\n    return [pointX, y, maxSegmentLength];\n  }\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {Array<number>} flatCenters Flat centers.\n * @return {Array<number>} Interior points as XYM coordinates, where M is the\n * length of the horizontal intersection that the point belongs to.\n */\nexport function getInteriorPointsOfMultiArray(flatCoordinates, offset, endss, stride, flatCenters) {\n  let interiorPoints = [];\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    interiorPoints = getInteriorPointOfArray(flatCoordinates,\n      offset, ends, stride, flatCenters, 2 * i, interiorPoints);\n    offset = ends[ends.length - 1];\n  }\n  return interiorPoints;\n}\n","/**\n * @module ol/geom/LineString\n */\nimport {extend} from '../array.js';\nimport {closestSquaredDistanceXY} from '../extent.js';\nimport GeometryLayout from '../geom/GeometryLayout.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport SimpleGeometry from '../geom/SimpleGeometry.js';\nimport {assignClosestPoint, maxSquaredDelta} from '../geom/flat/closest.js';\nimport {deflateCoordinates} from '../geom/flat/deflate.js';\nimport {inflateCoordinates} from '../geom/flat/inflate.js';\nimport {interpolatePoint, lineStringCoordinateAtM} from '../geom/flat/interpolate.js';\nimport {intersectsLineString} from '../geom/flat/intersectsextent.js';\nimport {lineStringLength} from '../geom/flat/length.js';\nimport {forEach as forEachSegment} from '../geom/flat/segments.js';\nimport {douglasPeucker} from '../geom/flat/simplify.js';\n\n/**\n * @classdesc\n * Linestring geometry.\n *\n * @api\n */\nclass LineString extends SimpleGeometry {\n\n  /**\n   * @param {Array<module:ol/coordinate~Coordinate>|Array<number>} coordinates Coordinates.\n   *     For internal use, flat coordinates in combination with `opt_layout` are also accepted.\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   */\n  constructor(coordinates, opt_layout) {\n\n    super();\n\n    /**\n     * @private\n     * @type {module:ol/coordinate~Coordinate}\n     */\n    this.flatMidpoint_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.flatMidpointRevision_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDelta_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDeltaRevision_ = -1;\n\n    if (opt_layout !== undefined && !Array.isArray(coordinates[0])) {\n      this.setFlatCoordinates(opt_layout, coordinates);\n    } else {\n      this.setCoordinates(coordinates, opt_layout);\n    }\n\n  }\n\n  /**\n   * Append the passed coordinate to the coordinates of the linestring.\n   * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n   * @api\n   */\n  appendCoordinate(coordinate) {\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = coordinate.slice();\n    } else {\n      extend(this.flatCoordinates, coordinate);\n    }\n    this.changed();\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!module:ol/geom/LineString} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    return new LineString(this.flatCoordinates.slice(), this.layout);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    if (this.maxDeltaRevision_ != this.getRevision()) {\n      this.maxDelta_ = Math.sqrt(maxSquaredDelta(\n        this.flatCoordinates, 0, this.flatCoordinates.length, this.stride, 0));\n      this.maxDeltaRevision_ = this.getRevision();\n    }\n    return assignClosestPoint(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,\n      this.maxDelta_, false, x, y, closestPoint, minSquaredDistance);\n  }\n\n  /**\n   * Iterate over each segment, calling the provided callback.\n   * If the callback returns a truthy value the function returns that\n   * value immediately. Otherwise the function returns `false`.\n   *\n   * @param {function(this: S, module:ol/coordinate~Coordinate, module:ol/coordinate~Coordinate): T} callback Function\n   *     called for each segment.\n   * @return {T|boolean} Value.\n   * @template T,S\n   * @api\n   */\n  forEachSegment(callback) {\n    return forEachSegment(this.flatCoordinates, 0, this.flatCoordinates.length, this.stride, callback);\n  }\n\n  /**\n   * Returns the coordinate at `m` using linear interpolation, or `null` if no\n   * such coordinate exists.\n   *\n   * `opt_extrapolate` controls extrapolation beyond the range of Ms in the\n   * MultiLineString. If `opt_extrapolate` is `true` then Ms less than the first\n   * M will return the first coordinate and Ms greater than the last M will\n   * return the last coordinate.\n   *\n   * @param {number} m M.\n   * @param {boolean=} opt_extrapolate Extrapolate. Default is `false`.\n   * @return {module:ol/coordinate~Coordinate} Coordinate.\n   * @api\n   */\n  getCoordinateAtM(m, opt_extrapolate) {\n    if (this.layout != GeometryLayout.XYM &&\n        this.layout != GeometryLayout.XYZM) {\n      return null;\n    }\n    const extrapolate = opt_extrapolate !== undefined ? opt_extrapolate : false;\n    return lineStringCoordinateAtM(this.flatCoordinates, 0,\n      this.flatCoordinates.length, this.stride, m, extrapolate);\n  }\n\n  /**\n   * Return the coordinates of the linestring.\n   * @return {Array<module:ol/coordinate~Coordinate>} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates() {\n    return inflateCoordinates(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);\n  }\n\n  /**\n   * Return the coordinate at the provided fraction along the linestring.\n   * The `fraction` is a number between 0 and 1, where 0 is the start of the\n   * linestring and 1 is the end.\n   * @param {number} fraction Fraction.\n   * @param {module:ol/coordinate~Coordinate=} opt_dest Optional coordinate whose values will\n   *     be modified. If not provided, a new coordinate will be returned.\n   * @return {module:ol/coordinate~Coordinate} Coordinate of the interpolated point.\n   * @api\n   */\n  getCoordinateAt(fraction, opt_dest) {\n    return interpolatePoint(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,\n      fraction, opt_dest);\n  }\n\n  /**\n   * Return the length of the linestring on projected plane.\n   * @return {number} Length (on projected plane).\n   * @api\n   */\n  getLength() {\n    return lineStringLength(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);\n  }\n\n  /**\n   * @return {Array<number>} Flat midpoint.\n   */\n  getFlatMidpoint() {\n    if (this.flatMidpointRevision_ != this.getRevision()) {\n      this.flatMidpoint_ = this.getCoordinateAt(0.5, this.flatMidpoint_);\n      this.flatMidpointRevision_ = this.getRevision();\n    }\n    return this.flatMidpoint_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometryInternal(squaredTolerance) {\n    const simplifiedFlatCoordinates = [];\n    simplifiedFlatCoordinates.length = douglasPeucker(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,\n      squaredTolerance, simplifiedFlatCoordinates, 0);\n    return new LineString(simplifiedFlatCoordinates, GeometryLayout.XY);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.LINE_STRING;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    return intersectsLineString(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,\n      extent);\n  }\n\n  /**\n   * Set the coordinates of the linestring.\n   * @param {!Array<module:ol/coordinate~Coordinate>} coordinates Coordinates.\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   * @override\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 1);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    this.flatCoordinates.length = deflateCoordinates(\n      this.flatCoordinates, 0, coordinates, this.stride);\n    this.changed();\n  }\n}\n\n\nexport default LineString;\n","/**\n * @module ol/extent/Corner\n */\n\n/**\n * Extent corner.\n * @enum {string}\n */\nexport default {\n  BOTTOM_LEFT: 'bottom-left',\n  BOTTOM_RIGHT: 'bottom-right',\n  TOP_LEFT: 'top-left',\n  TOP_RIGHT: 'top-right'\n};\n","/**\n * @module ol/TileRange\n */\n\n/**\n * A representation of a contiguous block of tiles.  A tile range is specified\n * by its min/max tile coordinates and is inclusive of coordinates.\n */\nclass TileRange {\n\n  /**\n   * @param {number} minX Minimum X.\n   * @param {number} maxX Maximum X.\n   * @param {number} minY Minimum Y.\n   * @param {number} maxY Maximum Y.\n   */\n  constructor(minX, maxX, minY, maxY) {\n\n    /**\n     * @type {number}\n     */\n    this.minX = minX;\n\n    /**\n     * @type {number}\n     */\n    this.maxX = maxX;\n\n    /**\n     * @type {number}\n     */\n    this.minY = minY;\n\n    /**\n     * @type {number}\n     */\n    this.maxY = maxY;\n\n  }\n\n  /**\n   * @param {module:ol/tilecoord~TileCoord} tileCoord Tile coordinate.\n   * @return {boolean} Contains tile coordinate.\n   */\n  contains(tileCoord) {\n    return this.containsXY(tileCoord[1], tileCoord[2]);\n  }\n\n  /**\n   * @param {module:ol/TileRange} tileRange Tile range.\n   * @return {boolean} Contains.\n   */\n  containsTileRange(tileRange) {\n    return this.minX <= tileRange.minX && tileRange.maxX <= this.maxX &&\n       this.minY <= tileRange.minY && tileRange.maxY <= this.maxY;\n  }\n\n  /**\n   * @param {number} x Tile coordinate x.\n   * @param {number} y Tile coordinate y.\n   * @return {boolean} Contains coordinate.\n   */\n  containsXY(x, y) {\n    return this.minX <= x && x <= this.maxX && this.minY <= y && y <= this.maxY;\n  }\n\n  /**\n   * @param {module:ol/TileRange} tileRange Tile range.\n   * @return {boolean} Equals.\n   */\n  equals(tileRange) {\n    return this.minX == tileRange.minX && this.minY == tileRange.minY &&\n       this.maxX == tileRange.maxX && this.maxY == tileRange.maxY;\n  }\n\n  /**\n   * @param {module:ol/TileRange} tileRange Tile range.\n   */\n  extend(tileRange) {\n    if (tileRange.minX < this.minX) {\n      this.minX = tileRange.minX;\n    }\n    if (tileRange.maxX > this.maxX) {\n      this.maxX = tileRange.maxX;\n    }\n    if (tileRange.minY < this.minY) {\n      this.minY = tileRange.minY;\n    }\n    if (tileRange.maxY > this.maxY) {\n      this.maxY = tileRange.maxY;\n    }\n  }\n\n  /**\n  * @return {number} Height.\n  */\n  getHeight() {\n    return this.maxY - this.minY + 1;\n  }\n\n  /**\n  * @return {module:ol/size~Size} Size.\n  */\n  getSize() {\n    return [this.getWidth(), this.getHeight()];\n  }\n\n  /**\n  * @return {number} Width.\n  */\n  getWidth() {\n    return this.maxX - this.minX + 1;\n  }\n\n  /**\n  * @param {module:ol/TileRange} tileRange Tile range.\n  * @return {boolean} Intersects.\n  */\n  intersects(tileRange) {\n    return this.minX <= tileRange.maxX &&\n       this.maxX >= tileRange.minX &&\n       this.minY <= tileRange.maxY &&\n       this.maxY >= tileRange.minY;\n  }\n}\n\n\n/**\n * @param {number} minX Minimum X.\n * @param {number} maxX Maximum X.\n * @param {number} minY Minimum Y.\n * @param {number} maxY Maximum Y.\n * @param {module:ol/TileRange=} tileRange TileRange.\n * @return {module:ol/TileRange} Tile range.\n */\nexport function createOrUpdate(minX, maxX, minY, maxY, tileRange) {\n  if (tileRange !== undefined) {\n    tileRange.minX = minX;\n    tileRange.maxX = maxX;\n    tileRange.minY = minY;\n    tileRange.maxY = maxY;\n    return tileRange;\n  } else {\n    return new TileRange(minX, maxX, minY, maxY);\n  }\n}\n\n\nexport default TileRange;\n","/**\n * @module ol/MapEvent\n */\nimport Event from './events/Event.js';\n\n/**\n * @classdesc\n * Events emitted as map events are instances of this type.\n * See {@link module:ol/PluggableMap~PluggableMap} for which events trigger a map event.\n */\nclass MapEvent extends Event {\n\n  /**\n   * @param {string} type Event type.\n   * @param {module:ol/PluggableMap} map Map.\n   * @param {?module:ol/PluggableMap~FrameState=} opt_frameState Frame state.\n   */\n  constructor(type, map, opt_frameState) {\n\n    super(type);\n\n    /**\n     * The map where the event occurred.\n     * @type {module:ol/PluggableMap}\n     * @api\n     */\n    this.map = map;\n\n    /**\n     * The frame state at the time of the event.\n     * @type {?module:ol/PluggableMap~FrameState}\n     * @api\n     */\n    this.frameState = opt_frameState !== undefined ? opt_frameState : null;\n\n  }\n\n}\n\nexport default MapEvent;\n","/**\n * @module ol/MapBrowserEvent\n */\nimport MapEvent from './MapEvent.js';\n\n/**\n * @classdesc\n * Events emitted as map browser events are instances of this type.\n * See {@link module:ol/PluggableMap~PluggableMap} for which events trigger a map browser event.\n */\nclass MapBrowserEvent extends MapEvent {\n\n  /**\n   * @param {string} type Event type.\n   * @param {module:ol/PluggableMap} map Map.\n   * @param {Event} browserEvent Browser event.\n   * @param {boolean=} opt_dragging Is the map currently being dragged?\n   * @param {?module:ol/PluggableMap~FrameState=} opt_frameState Frame state.\n   */\n  constructor(type, map, browserEvent, opt_dragging, opt_frameState) {\n\n    super(type, map, opt_frameState);\n\n    /**\n     * The original browser event.\n     * @const\n     * @type {Event}\n     * @api\n     */\n    this.originalEvent = browserEvent;\n\n    /**\n     * The map pixel relative to the viewport corresponding to the original browser event.\n     * @type {module:ol/pixel~Pixel}\n     * @api\n     */\n    this.pixel = map.getEventPixel(browserEvent);\n\n    /**\n     * The coordinate in view projection corresponding to the original browser event.\n     * @type {module:ol/coordinate~Coordinate}\n     * @api\n     */\n    this.coordinate = map.getCoordinateFromPixel(this.pixel);\n\n    /**\n     * Indicates if the map is currently being dragged. Only set for\n     * `POINTERDRAG` and `POINTERMOVE` events. Default is `false`.\n     *\n     * @type {boolean}\n     * @api\n     */\n    this.dragging = opt_dragging !== undefined ? opt_dragging : false;\n\n  }\n\n  /**\n   * Prevents the default browser action.\n   * See https://developer.mozilla.org/en-US/docs/Web/API/event.preventDefault.\n   * @override\n   * @api\n   */\n  preventDefault() {\n    super.preventDefault();\n    this.originalEvent.preventDefault();\n  }\n\n  /**\n   * Prevents further propagation of the current event.\n   * See https://developer.mozilla.org/en-US/docs/Web/API/event.stopPropagation.\n   * @override\n   * @api\n   */\n  stopPropagation() {\n    super.stopPropagation();\n    this.originalEvent.stopPropagation();\n  }\n}\n\n\nexport default MapBrowserEvent;\n","/**\n * @module ol/MapBrowserEventType\n */\nimport EventType from './events/EventType.js';\n\n/**\n * Constants for event names.\n * @enum {string}\n */\nexport default {\n\n  /**\n   * A true single click with no dragging and no double click. Note that this\n   * event is delayed by 250 ms to ensure that it is not a double click.\n   * @event module:ol/MapBrowserEvent~MapBrowserEvent#singleclick\n   * @api\n   */\n  SINGLECLICK: 'singleclick',\n\n  /**\n   * A click with no dragging. A double click will fire two of this.\n   * @event module:ol/MapBrowserEvent~MapBrowserEvent#click\n   * @api\n   */\n  CLICK: EventType.CLICK,\n\n  /**\n   * A true double click, with no dragging.\n   * @event module:ol/MapBrowserEvent~MapBrowserEvent#dblclick\n   * @api\n   */\n  DBLCLICK: EventType.DBLCLICK,\n\n  /**\n   * Triggered when a pointer is dragged.\n   * @event module:ol/MapBrowserEvent~MapBrowserEvent#pointerdrag\n   * @api\n   */\n  POINTERDRAG: 'pointerdrag',\n\n  /**\n   * Triggered when a pointer is moved. Note that on touch devices this is\n   * triggered when the map is panned, so is not the same as mousemove.\n   * @event module:ol/MapBrowserEvent~MapBrowserEvent#pointermove\n   * @api\n   */\n  POINTERMOVE: 'pointermove',\n\n  POINTERDOWN: 'pointerdown',\n  POINTERUP: 'pointerup',\n  POINTEROVER: 'pointerover',\n  POINTEROUT: 'pointerout',\n  POINTERENTER: 'pointerenter',\n  POINTERLEAVE: 'pointerleave',\n  POINTERCANCEL: 'pointercancel'\n};\n","/**\n * @module ol/MapBrowserPointerEvent\n */\nimport MapBrowserEvent from './MapBrowserEvent.js';\n\nclass MapBrowserPointerEvent extends MapBrowserEvent {\n\n  /**\n   * @param {string} type Event type.\n   * @param {module:ol/PluggableMap} map Map.\n   * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer event.\n   * @param {boolean=} opt_dragging Is the map currently being dragged?\n   * @param {?module:ol/PluggableMap~FrameState=} opt_frameState Frame state.\n   */\n  constructor(type, map, pointerEvent, opt_dragging, opt_frameState) {\n\n    super(type, map, pointerEvent.originalEvent, opt_dragging, opt_frameState);\n\n    /**\n     * @const\n     * @type {module:ol/pointer/PointerEvent}\n     */\n    this.pointerEvent = pointerEvent;\n\n  }\n\n}\n\nexport default MapBrowserPointerEvent;\n","/**\n * @module ol/pointer/EventType\n */\n\n/**\n * Constants for event names.\n * @enum {string}\n */\nexport default {\n  POINTERMOVE: 'pointermove',\n  POINTERDOWN: 'pointerdown',\n  POINTERUP: 'pointerup',\n  POINTEROVER: 'pointerover',\n  POINTEROUT: 'pointerout',\n  POINTERENTER: 'pointerenter',\n  POINTERLEAVE: 'pointerleave',\n  POINTERCANCEL: 'pointercancel'\n};\n","/**\n * @module ol/pointer/EventSource\n */\n\nclass EventSource {\n\n  /**\n   * @param {module:ol/pointer/PointerEventHandler} dispatcher Event handler.\n   * @param {!Object<string, function(Event)>} mapping Event mapping.\n   */\n  constructor(dispatcher, mapping) {\n\n    /**\n     * @type {module:ol/pointer/PointerEventHandler}\n     */\n    this.dispatcher = dispatcher;\n\n    /**\n     * @private\n     * @const\n     * @type {!Object<string, function(Event)>}\n     */\n    this.mapping_ = mapping;\n  }\n\n  /**\n   * List of events supported by this source.\n   * @return {Array<string>} Event names\n   */\n  getEvents() {\n    return Object.keys(this.mapping_);\n  }\n\n  /**\n   * Returns the handler that should handle a given event type.\n   * @param {string} eventType The event type.\n   * @return {function(Event)} Handler\n   */\n  getHandlerForEvent(eventType) {\n    return this.mapping_[eventType];\n  }\n\n}\n\nexport default EventSource;\n","/**\n * @module ol/pointer/MouseSource\n */\n\n// Based on https://github.com/Polymer/PointerEvents\n\n// Copyright (c) 2013 The Polymer Authors. All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are\n// met:\n//\n// * Redistributions of source code must retain the above copyright\n// notice, this list of conditions and the following disclaimer.\n// * Redistributions in binary form must reproduce the above\n// copyright notice, this list of conditions and the following disclaimer\n// in the documentation and/or other materials provided with the\n// distribution.\n// * Neither the name of Google Inc. nor the names of its\n// contributors may be used to endorse or promote products derived from\n// this software without specific prior written permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\nimport EventSource from '../pointer/EventSource.js';\n\n\n/**\n * @type {number}\n */\nexport const POINTER_ID = 1;\n\n\n/**\n * @type {string}\n */\nexport const POINTER_TYPE = 'mouse';\n\n\n/**\n * Radius around touchend that swallows mouse events.\n *\n * @type {number}\n */\nconst DEDUP_DIST = 25;\n\n/**\n * Handler for `mousedown`.\n *\n * @this {module:ol/pointer/MouseSource}\n * @param {MouseEvent} inEvent The in event.\n */\nfunction mousedown(inEvent) {\n  if (!this.isEventSimulatedFromTouch_(inEvent)) {\n    // TODO(dfreedman) workaround for some elements not sending mouseup\n    // http://crbug/149091\n    if (POINTER_ID.toString() in this.pointerMap) {\n      this.cancel(inEvent);\n    }\n    const e = prepareEvent(inEvent, this.dispatcher);\n    this.pointerMap[POINTER_ID.toString()] = inEvent;\n    this.dispatcher.down(e, inEvent);\n  }\n}\n\n/**\n * Handler for `mousemove`.\n *\n * @this {module:ol/pointer/MouseSource}\n * @param {MouseEvent} inEvent The in event.\n */\nfunction mousemove(inEvent) {\n  if (!this.isEventSimulatedFromTouch_(inEvent)) {\n    const e = prepareEvent(inEvent, this.dispatcher);\n    this.dispatcher.move(e, inEvent);\n  }\n}\n\n/**\n * Handler for `mouseup`.\n *\n * @this {module:ol/pointer/MouseSource}\n * @param {MouseEvent} inEvent The in event.\n */\nfunction mouseup(inEvent) {\n  if (!this.isEventSimulatedFromTouch_(inEvent)) {\n    const p = this.pointerMap[POINTER_ID.toString()];\n\n    if (p && p.button === inEvent.button) {\n      const e = prepareEvent(inEvent, this.dispatcher);\n      this.dispatcher.up(e, inEvent);\n      this.cleanupMouse();\n    }\n  }\n}\n\n/**\n * Handler for `mouseover`.\n *\n * @this {module:ol/pointer/MouseSource}\n * @param {MouseEvent} inEvent The in event.\n */\nfunction mouseover(inEvent) {\n  if (!this.isEventSimulatedFromTouch_(inEvent)) {\n    const e = prepareEvent(inEvent, this.dispatcher);\n    this.dispatcher.enterOver(e, inEvent);\n  }\n}\n\n/**\n * Handler for `mouseout`.\n *\n * @this {module:ol/pointer/MouseSource}\n * @param {MouseEvent} inEvent The in event.\n */\nfunction mouseout(inEvent) {\n  if (!this.isEventSimulatedFromTouch_(inEvent)) {\n    const e = prepareEvent(inEvent, this.dispatcher);\n    this.dispatcher.leaveOut(e, inEvent);\n  }\n}\n\n\nclass MouseSource extends EventSource {\n\n  /**\n   * @param {module:ol/pointer/PointerEventHandler} dispatcher Event handler.\n   */\n  constructor(dispatcher) {\n    const mapping = {\n      'mousedown': mousedown,\n      'mousemove': mousemove,\n      'mouseup': mouseup,\n      'mouseover': mouseover,\n      'mouseout': mouseout\n    };\n    super(dispatcher, mapping);\n\n    /**\n     * @const\n     * @type {!Object<string, Event|Object>}\n     */\n    this.pointerMap = dispatcher.pointerMap;\n\n    /**\n     * @const\n     * @type {Array<module:ol/pixel~Pixel>}\n     */\n    this.lastTouches = [];\n  }\n\n  /**\n   * Detect if a mouse event was simulated from a touch by\n   * checking if previously there was a touch event at the\n   * same position.\n   *\n   * FIXME - Known problem with the native Android browser on\n   * Samsung GT-I9100 (Android 4.1.2):\n   * In case the page is scrolled, this function does not work\n   * correctly when a canvas is used (WebGL or canvas renderer).\n   * Mouse listeners on canvas elements (for this browser), create\n   * two mouse events: One 'good' and one 'bad' one (on other browsers or\n   * when a div is used, there is only one event). For the 'bad' one,\n   * clientX/clientY and also pageX/pageY are wrong when the page\n   * is scrolled. Because of that, this function can not detect if\n   * the events were simulated from a touch event. As result, a\n   * pointer event at a wrong position is dispatched, which confuses\n   * the map interactions.\n   * It is unclear, how one can get the correct position for the event\n   * or detect that the positions are invalid.\n   *\n   * @private\n   * @param {MouseEvent} inEvent The in event.\n   * @return {boolean} True, if the event was generated by a touch.\n   */\n  isEventSimulatedFromTouch_(inEvent) {\n    const lts = this.lastTouches;\n    const x = inEvent.clientX;\n    const y = inEvent.clientY;\n    for (let i = 0, l = lts.length, t; i < l && (t = lts[i]); i++) {\n      // simulated mouse events will be swallowed near a primary touchend\n      const dx = Math.abs(x - t[0]);\n      const dy = Math.abs(y - t[1]);\n      if (dx <= DEDUP_DIST && dy <= DEDUP_DIST) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /**\n   * Dispatches a `pointercancel` event.\n   *\n   * @param {Event} inEvent The in event.\n   */\n  cancel(inEvent) {\n    const e = prepareEvent(inEvent, this.dispatcher);\n    this.dispatcher.cancel(e, inEvent);\n    this.cleanupMouse();\n  }\n\n  /**\n   * Remove the mouse from the list of active pointers.\n   */\n  cleanupMouse() {\n    delete this.pointerMap[POINTER_ID.toString()];\n  }\n}\n\n\n/**\n * Creates a copy of the original event that will be used\n * for the fake pointer event.\n *\n * @param {Event} inEvent The in event.\n * @param {module:ol/pointer/PointerEventHandler} dispatcher Event handler.\n * @return {Object} The copied event.\n */\nfunction prepareEvent(inEvent, dispatcher) {\n  const e = dispatcher.cloneEvent(inEvent, inEvent);\n\n  // forward mouse preventDefault\n  const pd = e.preventDefault;\n  e.preventDefault = function() {\n    inEvent.preventDefault();\n    pd();\n  };\n\n  e.pointerId = POINTER_ID;\n  e.isPrimary = true;\n  e.pointerType = POINTER_TYPE;\n\n  return e;\n}\n\n\nexport default MouseSource;\n","/**\n * @module ol/pointer/MsSource\n */\n// Based on https://github.com/Polymer/PointerEvents\n\n// Copyright (c) 2013 The Polymer Authors. All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are\n// met:\n//\n// * Redistributions of source code must retain the above copyright\n// notice, this list of conditions and the following disclaimer.\n// * Redistributions in binary form must reproduce the above\n// copyright notice, this list of conditions and the following disclaimer\n// in the documentation and/or other materials provided with the\n// distribution.\n// * Neither the name of Google Inc. nor the names of its\n// contributors may be used to endorse or promote products derived from\n// this software without specific prior written permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\nimport EventSource from '../pointer/EventSource.js';\n\n\n/**\n * @const\n * @type {Array<string>}\n */\nconst POINTER_TYPES = [\n  '',\n  'unavailable',\n  'touch',\n  'pen',\n  'mouse'\n];\n\n/**\n * Handler for `msPointerDown`.\n *\n * @this {module:ol/pointer/MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msPointerDown(inEvent) {\n  this.pointerMap[inEvent.pointerId.toString()] = inEvent;\n  const e = this.prepareEvent_(inEvent);\n  this.dispatcher.down(e, inEvent);\n}\n\n/**\n * Handler for `msPointerMove`.\n *\n * @this {module:ol/pointer/MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msPointerMove(inEvent) {\n  const e = this.prepareEvent_(inEvent);\n  this.dispatcher.move(e, inEvent);\n}\n\n/**\n * Handler for `msPointerUp`.\n *\n * @this {module:ol/pointer/MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msPointerUp(inEvent) {\n  const e = this.prepareEvent_(inEvent);\n  this.dispatcher.up(e, inEvent);\n  this.cleanup(inEvent.pointerId);\n}\n\n/**\n * Handler for `msPointerOut`.\n *\n * @this {module:ol/pointer/MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msPointerOut(inEvent) {\n  const e = this.prepareEvent_(inEvent);\n  this.dispatcher.leaveOut(e, inEvent);\n}\n\n/**\n * Handler for `msPointerOver`.\n *\n * @this {module:ol/pointer/MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msPointerOver(inEvent) {\n  const e = this.prepareEvent_(inEvent);\n  this.dispatcher.enterOver(e, inEvent);\n}\n\n/**\n * Handler for `msPointerCancel`.\n *\n * @this {module:ol/pointer/MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msPointerCancel(inEvent) {\n  const e = this.prepareEvent_(inEvent);\n  this.dispatcher.cancel(e, inEvent);\n  this.cleanup(inEvent.pointerId);\n}\n\n/**\n * Handler for `msLostPointerCapture`.\n *\n * @this {module:ol/pointer/MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msLostPointerCapture(inEvent) {\n  const e = this.dispatcher.makeEvent('lostpointercapture', inEvent, inEvent);\n  this.dispatcher.dispatchEvent(e);\n}\n\n/**\n * Handler for `msGotPointerCapture`.\n *\n * @this {module:ol/pointer/MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msGotPointerCapture(inEvent) {\n  const e = this.dispatcher.makeEvent('gotpointercapture', inEvent, inEvent);\n  this.dispatcher.dispatchEvent(e);\n}\n\nclass MsSource extends EventSource {\n\n  /**\n   * @param {module:ol/pointer/PointerEventHandler} dispatcher Event handler.\n   */\n  constructor(dispatcher) {\n    const mapping = {\n      'MSPointerDown': msPointerDown,\n      'MSPointerMove': msPointerMove,\n      'MSPointerUp': msPointerUp,\n      'MSPointerOut': msPointerOut,\n      'MSPointerOver': msPointerOver,\n      'MSPointerCancel': msPointerCancel,\n      'MSGotPointerCapture': msGotPointerCapture,\n      'MSLostPointerCapture': msLostPointerCapture\n    };\n    super(dispatcher, mapping);\n\n    /**\n     * @const\n     * @type {!Object<string, MSPointerEvent|Object>}\n     */\n    this.pointerMap = dispatcher.pointerMap;\n  }\n\n  /**\n   * Creates a copy of the original event that will be used\n   * for the fake pointer event.\n   *\n   * @private\n   * @param {MSPointerEvent} inEvent The in event.\n   * @return {Object} The copied event.\n   */\n  prepareEvent_(inEvent) {\n    let e = inEvent;\n    if (typeof inEvent.pointerType === 'number') {\n      e = this.dispatcher.cloneEvent(inEvent, inEvent);\n      e.pointerType = POINTER_TYPES[inEvent.pointerType];\n    }\n\n    return e;\n  }\n\n  /**\n   * Remove this pointer from the list of active pointers.\n   * @param {number} pointerId Pointer identifier.\n   */\n  cleanup(pointerId) {\n    delete this.pointerMap[pointerId.toString()];\n  }\n\n}\n\nexport default MsSource;\n","/**\n * @module ol/pointer/NativeSource\n */\n\n// Based on https://github.com/Polymer/PointerEvents\n\n// Copyright (c) 2013 The Polymer Authors. All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are\n// met:\n//\n// * Redistributions of source code must retain the above copyright\n// notice, this list of conditions and the following disclaimer.\n// * Redistributions in binary form must reproduce the above\n// copyright notice, this list of conditions and the following disclaimer\n// in the documentation and/or other materials provided with the\n// distribution.\n// * Neither the name of Google Inc. nor the names of its\n// contributors may be used to endorse or promote products derived from\n// this software without specific prior written permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\nimport EventSource from '../pointer/EventSource.js';\n\n/**\n * Handler for `pointerdown`.\n *\n * @this {module:ol/pointer/NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction pointerDown(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `pointermove`.\n *\n * @this {module:ol/pointer/NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction pointerMove(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `pointerup`.\n *\n * @this {module:ol/pointer/NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction pointerUp(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `pointerout`.\n *\n * @this {module:ol/pointer/NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction pointerOut(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `pointerover`.\n *\n * @this {module:ol/pointer/NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction pointerOver(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `pointercancel`.\n *\n * @this {module:ol/pointer/NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction pointerCancel(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `lostpointercapture`.\n *\n * @this {module:ol/pointer/NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction lostPointerCapture(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `gotpointercapture`.\n *\n * @this {module:ol/pointer/NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction gotPointerCapture(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\nclass NativeSource extends EventSource {\n\n  /**\n   * @param {module:ol/pointer/PointerEventHandler} dispatcher Event handler.\n   */\n  constructor(dispatcher) {\n    const mapping = {\n      'pointerdown': pointerDown,\n      'pointermove': pointerMove,\n      'pointerup': pointerUp,\n      'pointerout': pointerOut,\n      'pointerover': pointerOver,\n      'pointercancel': pointerCancel,\n      'gotpointercapture': gotPointerCapture,\n      'lostpointercapture': lostPointerCapture\n    };\n    super(dispatcher, mapping);\n  }\n\n}\n\nexport default NativeSource;\n","/**\n * @module ol/pointer/PointerEvent\n */\n\n// Based on https://github.com/Polymer/PointerEvents\n\n// Copyright (c) 2013 The Polymer Authors. All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are\n// met:\n//\n// * Redistributions of source code must retain the above copyright\n// notice, this list of conditions and the following disclaimer.\n// * Redistributions in binary form must reproduce the above\n// copyright notice, this list of conditions and the following disclaimer\n// in the documentation and/or other materials provided with the\n// distribution.\n// * Neither the name of Google Inc. nor the names of its\n// contributors may be used to endorse or promote products derived from\n// this software without specific prior written permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\nimport Event from '../events/Event.js';\n\n\n/**\n * Is the `buttons` property supported?\n * @type {boolean}\n */\nlet HAS_BUTTONS = false;\n\n\nclass PointerEvent extends Event {\n\n  /**\n   * A class for pointer events.\n   *\n   * This class is used as an abstraction for mouse events,\n   * touch events and even native pointer events.\n   *\n   * @param {string} type The type of the event to create.\n   * @param {Event} originalEvent The event.\n   * @param {Object<string, ?>=} opt_eventDict An optional dictionary of\n   *    initial event properties.\n   */\n  constructor(type, originalEvent, opt_eventDict) {\n    super(type);\n\n    /**\n     * @const\n     * @type {Event}\n     */\n    this.originalEvent = originalEvent;\n\n    const eventDict = opt_eventDict ? opt_eventDict : {};\n\n    /**\n     * @type {number}\n     */\n    this.buttons = this.getButtons_(eventDict);\n\n    /**\n     * @type {number}\n     */\n    this.pressure = this.getPressure_(eventDict, this.buttons);\n\n    // MouseEvent related properties\n\n    /**\n     * @type {boolean}\n     */\n    this.bubbles = 'bubbles' in eventDict ? eventDict['bubbles'] : false;\n\n    /**\n     * @type {boolean}\n     */\n    this.cancelable = 'cancelable' in eventDict ? eventDict['cancelable'] : false;\n\n    /**\n     * @type {Object}\n     */\n    this.view = 'view' in eventDict ? eventDict['view'] : null;\n\n    /**\n     * @type {number}\n     */\n    this.detail = 'detail' in eventDict ? eventDict['detail'] : null;\n\n    /**\n     * @type {number}\n     */\n    this.screenX = 'screenX' in eventDict ? eventDict['screenX'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.screenY = 'screenY' in eventDict ? eventDict['screenY'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.clientX = 'clientX' in eventDict ? eventDict['clientX'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.clientY = 'clientY' in eventDict ? eventDict['clientY'] : 0;\n\n    /**\n     * @type {boolean}\n     */\n    this.ctrlKey = 'ctrlKey' in eventDict ? eventDict['ctrlKey'] : false;\n\n    /**\n     * @type {boolean}\n     */\n    this.altKey = 'altKey' in eventDict ? eventDict['altKey'] : false;\n\n    /**\n     * @type {boolean}\n     */\n    this.shiftKey = 'shiftKey' in eventDict ? eventDict['shiftKey'] : false;\n\n    /**\n     * @type {boolean}\n     */\n    this.metaKey = 'metaKey' in eventDict ? eventDict['metaKey'] : false;\n\n    /**\n     * @type {number}\n     */\n    this.button = 'button' in eventDict ? eventDict['button'] : 0;\n\n    /**\n     * @type {Node}\n     */\n    this.relatedTarget = 'relatedTarget' in eventDict ?\n      eventDict['relatedTarget'] : null;\n\n    // PointerEvent related properties\n\n    /**\n     * @const\n     * @type {number}\n     */\n    this.pointerId = 'pointerId' in eventDict ? eventDict['pointerId'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.width = 'width' in eventDict ? eventDict['width'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.height = 'height' in eventDict ? eventDict['height'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.tiltX = 'tiltX' in eventDict ? eventDict['tiltX'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.tiltY = 'tiltY' in eventDict ? eventDict['tiltY'] : 0;\n\n    /**\n     * @type {string}\n     */\n    this.pointerType = 'pointerType' in eventDict ? eventDict['pointerType'] : '';\n\n    /**\n     * @type {number}\n     */\n    this.hwTimestamp = 'hwTimestamp' in eventDict ? eventDict['hwTimestamp'] : 0;\n\n    /**\n     * @type {boolean}\n     */\n    this.isPrimary = 'isPrimary' in eventDict ? eventDict['isPrimary'] : false;\n\n    // keep the semantics of preventDefault\n    if (originalEvent.preventDefault) {\n      this.preventDefault = function() {\n        originalEvent.preventDefault();\n      };\n    }\n  }\n\n  /**\n   * @private\n   * @param {Object<string, ?>} eventDict The event dictionary.\n   * @return {number} Button indicator.\n   */\n  getButtons_(eventDict) {\n    // According to the w3c spec,\n    // http://www.w3.org/TR/DOM-Level-3-Events/#events-MouseEvent-button\n    // MouseEvent.button == 0 can mean either no mouse button depressed, or the\n    // left mouse button depressed.\n    //\n    // As of now, the only way to distinguish between the two states of\n    // MouseEvent.button is by using the deprecated MouseEvent.which property, as\n    // this maps mouse buttons to positive integers > 0, and uses 0 to mean that\n    // no mouse button is held.\n    //\n    // MouseEvent.which is derived from MouseEvent.button at MouseEvent creation,\n    // but initMouseEvent does not expose an argument with which to set\n    // MouseEvent.which. Calling initMouseEvent with a buttonArg of 0 will set\n    // MouseEvent.button == 0 and MouseEvent.which == 1, breaking the expectations\n    // of app developers.\n    //\n    // The only way to propagate the correct state of MouseEvent.which and\n    // MouseEvent.button to a new MouseEvent.button == 0 and MouseEvent.which == 0\n    // is to call initMouseEvent with a buttonArg value of -1.\n    //\n    // This is fixed with DOM Level 4's use of buttons\n    let buttons;\n    if (eventDict.buttons || HAS_BUTTONS) {\n      buttons = eventDict.buttons;\n    } else {\n      switch (eventDict.which) {\n        case 1: buttons = 1; break;\n        case 2: buttons = 4; break;\n        case 3: buttons = 2; break;\n        default: buttons = 0;\n      }\n    }\n    return buttons;\n  }\n\n  /**\n   * @private\n   * @param {Object<string, ?>} eventDict The event dictionary.\n   * @param {number} buttons Button indicator.\n   * @return {number} The pressure.\n   */\n  getPressure_(eventDict, buttons) {\n    // Spec requires that pointers without pressure specified use 0.5 for down\n    // state and 0 for up state.\n    let pressure = 0;\n    if (eventDict.pressure) {\n      pressure = eventDict.pressure;\n    } else {\n      pressure = buttons ? 0.5 : 0;\n    }\n    return pressure;\n  }\n}\n\n\n/**\n * Checks if the `buttons` property is supported.\n */\n(function() {\n  try {\n    const ev = new MouseEvent('click', {buttons: 1});\n    HAS_BUTTONS = ev.buttons === 1;\n  } catch (e) {\n    // pass\n  }\n})();\n\nexport default PointerEvent;\n","/**\n * @module ol/pointer/TouchSource\n */\n\n// Based on https://github.com/Polymer/PointerEvents\n\n// Copyright (c) 2013 The Polymer Authors. All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are\n// met:\n//\n// * Redistributions of source code must retain the above copyright\n// notice, this list of conditions and the following disclaimer.\n// * Redistributions in binary form must reproduce the above\n// copyright notice, this list of conditions and the following disclaimer\n// in the documentation and/or other materials provided with the\n// distribution.\n// * Neither the name of Google Inc. nor the names of its\n// contributors may be used to endorse or promote products derived from\n// this software without specific prior written permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\nimport {remove} from '../array.js';\nimport EventSource from '../pointer/EventSource.js';\nimport {POINTER_ID} from '../pointer/MouseSource.js';\n\n\n/**\n * @type {number}\n */\nconst CLICK_COUNT_TIMEOUT = 200;\n\n/**\n * @type {string}\n */\nconst POINTER_TYPE = 'touch';\n\n/**\n * Handler for `touchstart`, triggers `pointerover`,\n * `pointerenter` and `pointerdown` events.\n *\n * @this {module:ol/pointer/TouchSource}\n * @param {TouchEvent} inEvent The in event.\n */\nfunction touchstart(inEvent) {\n  this.vacuumTouches_(inEvent);\n  this.setPrimaryTouch_(inEvent.changedTouches[0]);\n  this.dedupSynthMouse_(inEvent);\n  this.clickCount_++;\n  this.processTouches_(inEvent, this.overDown_);\n}\n\n/**\n * Handler for `touchmove`.\n *\n * @this {module:ol/pointer/TouchSource}\n * @param {TouchEvent} inEvent The in event.\n */\nfunction touchmove(inEvent) {\n  this.processTouches_(inEvent, this.moveOverOut_);\n}\n\n/**\n * Handler for `touchend`, triggers `pointerup`,\n * `pointerout` and `pointerleave` events.\n *\n * @this {module:ol/pointer/TouchSource}\n * @param {TouchEvent} inEvent The event.\n */\nfunction touchend(inEvent) {\n  this.dedupSynthMouse_(inEvent);\n  this.processTouches_(inEvent, this.upOut_);\n}\n\n/**\n * Handler for `touchcancel`, triggers `pointercancel`,\n * `pointerout` and `pointerleave` events.\n *\n * @this {module:ol/pointer/TouchSource}\n * @param {TouchEvent} inEvent The in event.\n */\nfunction touchcancel(inEvent) {\n  this.processTouches_(inEvent, this.cancelOut_);\n}\n\n\nclass TouchSource extends EventSource {\n\n  /**\n   * @param {module:ol/pointer/PointerEventHandler} dispatcher The event handler.\n   * @param {module:ol/pointer/MouseSource} mouseSource Mouse source.\n   */\n  constructor(dispatcher, mouseSource) {\n    const mapping = {\n      'touchstart': touchstart,\n      'touchmove': touchmove,\n      'touchend': touchend,\n      'touchcancel': touchcancel\n    };\n    super(dispatcher, mapping);\n\n    /**\n     * @const\n     * @type {!Object<string, Event|Object>}\n     */\n    this.pointerMap = dispatcher.pointerMap;\n\n    /**\n     * @const\n     * @type {module:ol/pointer/MouseSource}\n     */\n    this.mouseSource = mouseSource;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.firstTouchId_ = undefined;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.clickCount_ = 0;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.resetId_ = undefined;\n\n    /**\n     * Mouse event timeout: This should be long enough to\n     * ignore compat mouse events made by touch.\n     * @private\n     * @type {number}\n     */\n    this.dedupTimeout_ = 2500;\n  }\n\n  /**\n   * @private\n   * @param {Touch} inTouch The in touch.\n   * @return {boolean} True, if this is the primary touch.\n   */\n  isPrimaryTouch_(inTouch) {\n    return this.firstTouchId_ === inTouch.identifier;\n  }\n\n  /**\n   * Set primary touch if there are no pointers, or the only pointer is the mouse.\n   * @param {Touch} inTouch The in touch.\n   * @private\n   */\n  setPrimaryTouch_(inTouch) {\n    const count = Object.keys(this.pointerMap).length;\n    if (count === 0 || (count === 1 && POINTER_ID.toString() in this.pointerMap)) {\n      this.firstTouchId_ = inTouch.identifier;\n      this.cancelResetClickCount_();\n    }\n  }\n\n  /**\n   * @private\n   * @param {PointerEvent} inPointer The in pointer object.\n   */\n  removePrimaryPointer_(inPointer) {\n    if (inPointer.isPrimary) {\n      this.firstTouchId_ = undefined;\n      this.resetClickCount_();\n    }\n  }\n\n  /**\n   * @private\n   */\n  resetClickCount_() {\n    this.resetId_ = setTimeout(\n      this.resetClickCountHandler_.bind(this),\n      CLICK_COUNT_TIMEOUT);\n  }\n\n  /**\n   * @private\n   */\n  resetClickCountHandler_() {\n    this.clickCount_ = 0;\n    this.resetId_ = undefined;\n  }\n\n  /**\n   * @private\n   */\n  cancelResetClickCount_() {\n    if (this.resetId_ !== undefined) {\n      clearTimeout(this.resetId_);\n    }\n  }\n\n  /**\n   * @private\n   * @param {TouchEvent} browserEvent Browser event\n   * @param {Touch} inTouch Touch event\n   * @return {PointerEvent} A pointer object.\n   */\n  touchToPointer_(browserEvent, inTouch) {\n    const e = this.dispatcher.cloneEvent(browserEvent, inTouch);\n    // Spec specifies that pointerId 1 is reserved for Mouse.\n    // Touch identifiers can start at 0.\n    // Add 2 to the touch identifier for compatibility.\n    e.pointerId = inTouch.identifier + 2;\n    // TODO: check if this is necessary?\n    //e.target = findTarget(e);\n    e.bubbles = true;\n    e.cancelable = true;\n    e.detail = this.clickCount_;\n    e.button = 0;\n    e.buttons = 1;\n    e.width = inTouch.webkitRadiusX || inTouch.radiusX || 0;\n    e.height = inTouch.webkitRadiusY || inTouch.radiusY || 0;\n    e.pressure = inTouch.webkitForce || inTouch.force || 0.5;\n    e.isPrimary = this.isPrimaryTouch_(inTouch);\n    e.pointerType = POINTER_TYPE;\n\n    // make sure that the properties that are different for\n    // each `Touch` object are not copied from the BrowserEvent object\n    e.clientX = inTouch.clientX;\n    e.clientY = inTouch.clientY;\n    e.screenX = inTouch.screenX;\n    e.screenY = inTouch.screenY;\n\n    return e;\n  }\n\n  /**\n   * @private\n   * @param {TouchEvent} inEvent Touch event\n   * @param {function(TouchEvent, PointerEvent)} inFunction In function.\n   */\n  processTouches_(inEvent, inFunction) {\n    const touches = Array.prototype.slice.call(inEvent.changedTouches);\n    const count = touches.length;\n    function preventDefault() {\n      inEvent.preventDefault();\n    }\n    for (let i = 0; i < count; ++i) {\n      const pointer = this.touchToPointer_(inEvent, touches[i]);\n      // forward touch preventDefaults\n      pointer.preventDefault = preventDefault;\n      inFunction.call(this, inEvent, pointer);\n    }\n  }\n\n  /**\n   * @private\n   * @param {TouchList} touchList The touch list.\n   * @param {number} searchId Search identifier.\n   * @return {boolean} True, if the `Touch` with the given id is in the list.\n   */\n  findTouch_(touchList, searchId) {\n    const l = touchList.length;\n    for (let i = 0; i < l; i++) {\n      const touch = touchList[i];\n      if (touch.identifier === searchId) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /**\n   * In some instances, a touchstart can happen without a touchend. This\n   * leaves the pointermap in a broken state.\n   * Therefore, on every touchstart, we remove the touches that did not fire a\n   * touchend event.\n   * To keep state globally consistent, we fire a pointercancel for\n   * this \"abandoned\" touch\n   *\n   * @private\n   * @param {TouchEvent} inEvent The in event.\n   */\n  vacuumTouches_(inEvent) {\n    const touchList = inEvent.touches;\n    // pointerMap.getCount() should be < touchList.length here,\n    // as the touchstart has not been processed yet.\n    const keys = Object.keys(this.pointerMap);\n    const count = keys.length;\n    if (count >= touchList.length) {\n      const d = [];\n      for (let i = 0; i < count; ++i) {\n        const key = keys[i];\n        const value = this.pointerMap[key];\n        // Never remove pointerId == 1, which is mouse.\n        // Touch identifiers are 2 smaller than their pointerId, which is the\n        // index in pointermap.\n        if (key != POINTER_ID && !this.findTouch_(touchList, key - 2)) {\n          d.push(value.out);\n        }\n      }\n      for (let i = 0; i < d.length; ++i) {\n        this.cancelOut_(inEvent, d[i]);\n      }\n    }\n  }\n\n  /**\n   * @private\n   * @param {TouchEvent} browserEvent The event.\n   * @param {PointerEvent} inPointer The in pointer object.\n   */\n  overDown_(browserEvent, inPointer) {\n    this.pointerMap[inPointer.pointerId] = {\n      target: inPointer.target,\n      out: inPointer,\n      outTarget: inPointer.target\n    };\n    this.dispatcher.over(inPointer, browserEvent);\n    this.dispatcher.enter(inPointer, browserEvent);\n    this.dispatcher.down(inPointer, browserEvent);\n  }\n\n  /**\n   * @private\n   * @param {TouchEvent} browserEvent The event.\n   * @param {PointerEvent} inPointer The in pointer.\n   */\n  moveOverOut_(browserEvent, inPointer) {\n    const event = inPointer;\n    const pointer = this.pointerMap[event.pointerId];\n    // a finger drifted off the screen, ignore it\n    if (!pointer) {\n      return;\n    }\n    const outEvent = pointer.out;\n    const outTarget = pointer.outTarget;\n    this.dispatcher.move(event, browserEvent);\n    if (outEvent && outTarget !== event.target) {\n      outEvent.relatedTarget = event.target;\n      event.relatedTarget = outTarget;\n      // recover from retargeting by shadow\n      outEvent.target = outTarget;\n      if (event.target) {\n        this.dispatcher.leaveOut(outEvent, browserEvent);\n        this.dispatcher.enterOver(event, browserEvent);\n      } else {\n        // clean up case when finger leaves the screen\n        event.target = outTarget;\n        event.relatedTarget = null;\n        this.cancelOut_(browserEvent, event);\n      }\n    }\n    pointer.out = event;\n    pointer.outTarget = event.target;\n  }\n\n  /**\n   * @private\n   * @param {TouchEvent} browserEvent An event.\n   * @param {PointerEvent} inPointer The inPointer object.\n   */\n  upOut_(browserEvent, inPointer) {\n    this.dispatcher.up(inPointer, browserEvent);\n    this.dispatcher.out(inPointer, browserEvent);\n    this.dispatcher.leave(inPointer, browserEvent);\n    this.cleanUpPointer_(inPointer);\n  }\n\n  /**\n   * @private\n   * @param {TouchEvent} browserEvent The event.\n   * @param {PointerEvent} inPointer The in pointer.\n   */\n  cancelOut_(browserEvent, inPointer) {\n    this.dispatcher.cancel(inPointer, browserEvent);\n    this.dispatcher.out(inPointer, browserEvent);\n    this.dispatcher.leave(inPointer, browserEvent);\n    this.cleanUpPointer_(inPointer);\n  }\n\n  /**\n   * @private\n   * @param {PointerEvent} inPointer The inPointer object.\n   */\n  cleanUpPointer_(inPointer) {\n    delete this.pointerMap[inPointer.pointerId];\n    this.removePrimaryPointer_(inPointer);\n  }\n\n  /**\n   * Prevent synth mouse events from creating pointer events.\n   *\n   * @private\n   * @param {TouchEvent} inEvent The in event.\n   */\n  dedupSynthMouse_(inEvent) {\n    const lts = this.mouseSource.lastTouches;\n    const t = inEvent.changedTouches[0];\n    // only the primary finger will synth mouse events\n    if (this.isPrimaryTouch_(t)) {\n      // remember x/y of last touch\n      const lt = [t.clientX, t.clientY];\n      lts.push(lt);\n\n      setTimeout(function() {\n        // remove touch after timeout\n        remove(lts, lt);\n      }, this.dedupTimeout_);\n    }\n  }\n}\n\nexport default TouchSource;\n","/**\n * @module ol/pointer/PointerEventHandler\n */\n\n// Based on https://github.com/Polymer/PointerEvents\n\n// Copyright (c) 2013 The Polymer Authors. All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are\n// met:\n//\n// * Redistributions of source code must retain the above copyright\n// notice, this list of conditions and the following disclaimer.\n// * Redistributions in binary form must reproduce the above\n// copyright notice, this list of conditions and the following disclaimer\n// in the documentation and/or other materials provided with the\n// distribution.\n// * Neither the name of Google Inc. nor the names of its\n// contributors may be used to endorse or promote products derived from\n// this software without specific prior written permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\nimport {listen, unlisten} from '../events.js';\nimport EventTarget from '../events/Target.js';\nimport {POINTER, MSPOINTER, TOUCH} from '../has.js';\nimport PointerEventType from '../pointer/EventType.js';\nimport MouseSource from '../pointer/MouseSource.js';\nimport MsSource from '../pointer/MsSource.js';\nimport NativeSource from '../pointer/NativeSource.js';\nimport PointerEvent from '../pointer/PointerEvent.js';\nimport TouchSource from '../pointer/TouchSource.js';\n\n\n/**\n * Properties to copy when cloning an event, with default values.\n * @type {Array<Array>}\n */\nconst CLONE_PROPS = [\n  // MouseEvent\n  ['bubbles', false],\n  ['cancelable', false],\n  ['view', null],\n  ['detail', null],\n  ['screenX', 0],\n  ['screenY', 0],\n  ['clientX', 0],\n  ['clientY', 0],\n  ['ctrlKey', false],\n  ['altKey', false],\n  ['shiftKey', false],\n  ['metaKey', false],\n  ['button', 0],\n  ['relatedTarget', null],\n  // DOM Level 3\n  ['buttons', 0],\n  // PointerEvent\n  ['pointerId', 0],\n  ['width', 0],\n  ['height', 0],\n  ['pressure', 0],\n  ['tiltX', 0],\n  ['tiltY', 0],\n  ['pointerType', ''],\n  ['hwTimestamp', 0],\n  ['isPrimary', false],\n  // event instance\n  ['type', ''],\n  ['target', null],\n  ['currentTarget', null],\n  ['which', 0]\n];\n\n\nclass PointerEventHandler extends EventTarget {\n\n  /**\n   * @param {Element|HTMLDocument} element Viewport element.\n   */\n  constructor(element) {\n    super();\n\n    /**\n     * @const\n     * @private\n     * @type {Element|HTMLDocument}\n     */\n    this.element_ = element;\n\n    /**\n     * @const\n     * @type {!Object<string, Event|Object>}\n     */\n    this.pointerMap = {};\n\n    /**\n     * @type {Object<string, function(Event)>}\n     * @private\n     */\n    this.eventMap_ = {};\n\n    /**\n     * @type {Array<module:ol/pointer/EventSource>}\n     * @private\n     */\n    this.eventSourceList_ = [];\n\n    this.registerSources();\n  }\n\n  /**\n   * Set up the event sources (mouse, touch and native pointers)\n   * that generate pointer events.\n   */\n  registerSources() {\n    if (POINTER) {\n      this.registerSource('native', new NativeSource(this));\n    } else if (MSPOINTER) {\n      this.registerSource('ms', new MsSource(this));\n    } else {\n      const mouseSource = new MouseSource(this);\n      this.registerSource('mouse', mouseSource);\n\n      if (TOUCH) {\n        this.registerSource('touch', new TouchSource(this, mouseSource));\n      }\n    }\n\n    // register events on the viewport element\n    this.register_();\n  }\n\n  /**\n   * Add a new event source that will generate pointer events.\n   *\n   * @param {string} name A name for the event source\n   * @param {module:ol/pointer/EventSource} source The source event.\n   */\n  registerSource(name, source) {\n    const s = source;\n    const newEvents = s.getEvents();\n\n    if (newEvents) {\n      newEvents.forEach(function(e) {\n        const handler = s.getHandlerForEvent(e);\n\n        if (handler) {\n          this.eventMap_[e] = handler.bind(s);\n        }\n      }.bind(this));\n      this.eventSourceList_.push(s);\n    }\n  }\n\n  /**\n   * Set up the events for all registered event sources.\n   * @private\n   */\n  register_() {\n    const l = this.eventSourceList_.length;\n    for (let i = 0; i < l; i++) {\n      const eventSource = this.eventSourceList_[i];\n      this.addEvents_(eventSource.getEvents());\n    }\n  }\n\n  /**\n   * Remove all registered events.\n   * @private\n   */\n  unregister_() {\n    const l = this.eventSourceList_.length;\n    for (let i = 0; i < l; i++) {\n      const eventSource = this.eventSourceList_[i];\n      this.removeEvents_(eventSource.getEvents());\n    }\n  }\n\n  /**\n   * Calls the right handler for a new event.\n   * @private\n   * @param {Event} inEvent Browser event.\n   */\n  eventHandler_(inEvent) {\n    const type = inEvent.type;\n    const handler = this.eventMap_[type];\n    if (handler) {\n      handler(inEvent);\n    }\n  }\n\n  /**\n   * Setup listeners for the given events.\n   * @private\n   * @param {Array<string>} events List of events.\n   */\n  addEvents_(events) {\n    events.forEach(function(eventName) {\n      listen(this.element_, eventName, this.eventHandler_, this);\n    }.bind(this));\n  }\n\n  /**\n   * Unregister listeners for the given events.\n   * @private\n   * @param {Array<string>} events List of events.\n   */\n  removeEvents_(events) {\n    events.forEach(function(e) {\n      unlisten(this.element_, e, this.eventHandler_, this);\n    }.bind(this));\n  }\n\n  /**\n   * Returns a snapshot of inEvent, with writable properties.\n   *\n   * @param {Event} event Browser event.\n   * @param {Event|Touch} inEvent An event that contains\n   *    properties to copy.\n   * @return {Object} An object containing shallow copies of\n   *    `inEvent`'s properties.\n   */\n  cloneEvent(event, inEvent) {\n    const eventCopy = {};\n    for (let i = 0, ii = CLONE_PROPS.length; i < ii; i++) {\n      const p = CLONE_PROPS[i][0];\n      eventCopy[p] = event[p] || inEvent[p] || CLONE_PROPS[i][1];\n    }\n\n    return eventCopy;\n  }\n\n  // EVENTS\n\n\n  /**\n   * Triggers a 'pointerdown' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  down(data, event) {\n    this.fireEvent(PointerEventType.POINTERDOWN, data, event);\n  }\n\n  /**\n   * Triggers a 'pointermove' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  move(data, event) {\n    this.fireEvent(PointerEventType.POINTERMOVE, data, event);\n  }\n\n  /**\n   * Triggers a 'pointerup' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  up(data, event) {\n    this.fireEvent(PointerEventType.POINTERUP, data, event);\n  }\n\n  /**\n   * Triggers a 'pointerenter' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  enter(data, event) {\n    data.bubbles = false;\n    this.fireEvent(PointerEventType.POINTERENTER, data, event);\n  }\n\n  /**\n   * Triggers a 'pointerleave' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  leave(data, event) {\n    data.bubbles = false;\n    this.fireEvent(PointerEventType.POINTERLEAVE, data, event);\n  }\n\n  /**\n   * Triggers a 'pointerover' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  over(data, event) {\n    data.bubbles = true;\n    this.fireEvent(PointerEventType.POINTEROVER, data, event);\n  }\n\n  /**\n   * Triggers a 'pointerout' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  out(data, event) {\n    data.bubbles = true;\n    this.fireEvent(PointerEventType.POINTEROUT, data, event);\n  }\n\n  /**\n   * Triggers a 'pointercancel' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  cancel(data, event) {\n    this.fireEvent(PointerEventType.POINTERCANCEL, data, event);\n  }\n\n  /**\n   * Triggers a combination of 'pointerout' and 'pointerleave' events.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  leaveOut(data, event) {\n    this.out(data, event);\n    if (!this.contains_(data.target, data.relatedTarget)) {\n      this.leave(data, event);\n    }\n  }\n\n  /**\n   * Triggers a combination of 'pointerover' and 'pointerevents' events.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  enterOver(data, event) {\n    this.over(data, event);\n    if (!this.contains_(data.target, data.relatedTarget)) {\n      this.enter(data, event);\n    }\n  }\n\n  /**\n   * @private\n   * @param {Element} container The container element.\n   * @param {Element} contained The contained element.\n   * @return {boolean} Returns true if the container element\n   *   contains the other element.\n   */\n  contains_(container, contained) {\n    if (!container || !contained) {\n      return false;\n    }\n    return container.contains(contained);\n  }\n\n  // EVENT CREATION AND TRACKING\n  /**\n   * Creates a new Event of type `inType`, based on the information in\n   * `data`.\n   *\n   * @param {string} inType A string representing the type of event to create.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   * @return {module:ol/pointer/PointerEvent} A PointerEvent of type `inType`.\n   */\n  makeEvent(inType, data, event) {\n    return new PointerEvent(inType, event, data);\n  }\n\n  /**\n   * Make and dispatch an event in one call.\n   * @param {string} inType A string representing the type of event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  fireEvent(inType, data, event) {\n    const e = this.makeEvent(inType, data, event);\n    this.dispatchEvent(e);\n  }\n\n  /**\n   * Creates a pointer event from a native pointer event\n   * and dispatches this event.\n   * @param {Event} event A platform event with a target.\n   */\n  fireNativeEvent(event) {\n    const e = this.makeEvent(event.type, event, event);\n    this.dispatchEvent(e);\n  }\n\n  /**\n   * Wrap a native mouse event into a pointer event.\n   * This proxy method is required for the legacy IE support.\n   * @param {string} eventType The pointer event type.\n   * @param {Event} event The event.\n   * @return {module:ol/pointer/PointerEvent} The wrapped event.\n   */\n  wrapMouseEvent(eventType, event) {\n    const pointerEvent = this.makeEvent(\n      eventType, MouseSource.prepareEvent(event, this), event);\n    return pointerEvent;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    this.unregister_();\n    super.disposeInternal();\n  }\n}\n\nexport default PointerEventHandler;\n","/**\n * @module ol/MapBrowserEventHandler\n */\nimport {DEVICE_PIXEL_RATIO} from './has.js';\nimport MapBrowserEventType from './MapBrowserEventType.js';\nimport MapBrowserPointerEvent from './MapBrowserPointerEvent.js';\nimport {listen, unlistenByKey} from './events.js';\nimport EventTarget from './events/Target.js';\nimport PointerEventType from './pointer/EventType.js';\nimport PointerEventHandler from './pointer/PointerEventHandler.js';\n\nclass MapBrowserEventHandler extends EventTarget {\n\n  /**\n   * @param {module:ol/PluggableMap} map The map with the viewport to listen to events on.\n   * @param {number=} moveTolerance The minimal distance the pointer must travel to trigger a move.\n   */\n  constructor(map, moveTolerance) {\n\n    super();\n\n    /**\n     * This is the element that we will listen to the real events on.\n     * @type {module:ol/PluggableMap}\n     * @private\n     */\n    this.map_ = map;\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.clickTimeoutId_ = 0;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.dragging_ = false;\n\n    /**\n     * @type {!Array<module:ol/events~EventsKey>}\n     * @private\n     */\n    this.dragListenerKeys_ = [];\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.moveTolerance_ = moveTolerance ?\n      moveTolerance * DEVICE_PIXEL_RATIO : DEVICE_PIXEL_RATIO;\n\n    /**\n     * The most recent \"down\" type event (or null if none have occurred).\n     * Set on pointerdown.\n     * @type {module:ol/pointer/PointerEvent}\n     * @private\n     */\n    this.down_ = null;\n\n    const element = this.map_.getViewport();\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.activePointers_ = 0;\n\n    /**\n     * @type {!Object<number, boolean>}\n     * @private\n     */\n    this.trackedTouches_ = {};\n\n    /**\n     * Event handler which generates pointer events for\n     * the viewport element.\n     *\n     * @type {module:ol/pointer/PointerEventHandler}\n     * @private\n     */\n    this.pointerEventHandler_ = new PointerEventHandler(element);\n\n    /**\n     * Event handler which generates pointer events for\n     * the document (used when dragging).\n     *\n     * @type {module:ol/pointer/PointerEventHandler}\n     * @private\n     */\n    this.documentPointerEventHandler_ = null;\n\n    /**\n     * @type {?module:ol/events~EventsKey}\n     * @private\n     */\n    this.pointerdownListenerKey_ = listen(this.pointerEventHandler_,\n      PointerEventType.POINTERDOWN,\n      this.handlePointerDown_, this);\n\n    /**\n     * @type {?module:ol/events~EventsKey}\n     * @private\n     */\n    this.relayedListenerKey_ = listen(this.pointerEventHandler_,\n      PointerEventType.POINTERMOVE,\n      this.relayEvent_, this);\n\n  }\n\n  /**\n   * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer\n   * event.\n   * @private\n   */\n  emulateClick_(pointerEvent) {\n    let newEvent = new MapBrowserPointerEvent(\n      MapBrowserEventType.CLICK, this.map_, pointerEvent);\n    this.dispatchEvent(newEvent);\n    if (this.clickTimeoutId_ !== 0) {\n      // double-click\n      clearTimeout(this.clickTimeoutId_);\n      this.clickTimeoutId_ = 0;\n      newEvent = new MapBrowserPointerEvent(\n        MapBrowserEventType.DBLCLICK, this.map_, pointerEvent);\n      this.dispatchEvent(newEvent);\n    } else {\n      // click\n      this.clickTimeoutId_ = setTimeout(function() {\n        this.clickTimeoutId_ = 0;\n        const newEvent = new MapBrowserPointerEvent(\n          MapBrowserEventType.SINGLECLICK, this.map_, pointerEvent);\n        this.dispatchEvent(newEvent);\n      }.bind(this), 250);\n    }\n  }\n\n  /**\n   * Keeps track on how many pointers are currently active.\n   *\n   * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer\n   * event.\n   * @private\n   */\n  updateActivePointers_(pointerEvent) {\n    const event = pointerEvent;\n\n    if (event.type == MapBrowserEventType.POINTERUP ||\n        event.type == MapBrowserEventType.POINTERCANCEL) {\n      delete this.trackedTouches_[event.pointerId];\n    } else if (event.type == MapBrowserEventType.POINTERDOWN) {\n      this.trackedTouches_[event.pointerId] = true;\n    }\n    this.activePointers_ = Object.keys(this.trackedTouches_).length;\n  }\n\n  /**\n   * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer\n   * event.\n   * @private\n   */\n  handlePointerUp_(pointerEvent) {\n    this.updateActivePointers_(pointerEvent);\n    const newEvent = new MapBrowserPointerEvent(\n      MapBrowserEventType.POINTERUP, this.map_, pointerEvent);\n    this.dispatchEvent(newEvent);\n\n    // We emulate click events on left mouse button click, touch contact, and pen\n    // contact. isMouseActionButton returns true in these cases (evt.button is set\n    // to 0).\n    // See http://www.w3.org/TR/pointerevents/#button-states\n    // We only fire click, singleclick, and doubleclick if nobody has called\n    // event.stopPropagation() or event.preventDefault().\n    if (!newEvent.propagationStopped && !this.dragging_ && this.isMouseActionButton_(pointerEvent)) {\n      this.emulateClick_(this.down_);\n    }\n\n    if (this.activePointers_ === 0) {\n      this.dragListenerKeys_.forEach(unlistenByKey);\n      this.dragListenerKeys_.length = 0;\n      this.dragging_ = false;\n      this.down_ = null;\n      this.documentPointerEventHandler_.dispose();\n      this.documentPointerEventHandler_ = null;\n    }\n  }\n\n  /**\n   * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer\n   * event.\n   * @return {boolean} If the left mouse button was pressed.\n   * @private\n   */\n  isMouseActionButton_(pointerEvent) {\n    return pointerEvent.button === 0;\n  }\n\n  /**\n   * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer\n   * event.\n   * @private\n   */\n  handlePointerDown_(pointerEvent) {\n    this.updateActivePointers_(pointerEvent);\n    const newEvent = new MapBrowserPointerEvent(\n      MapBrowserEventType.POINTERDOWN, this.map_, pointerEvent);\n    this.dispatchEvent(newEvent);\n\n    this.down_ = pointerEvent;\n\n    if (this.dragListenerKeys_.length === 0) {\n      /* Set up a pointer event handler on the `document`,\n       * which is required when the pointer is moved outside\n       * the viewport when dragging.\n       */\n      this.documentPointerEventHandler_ =\n          new PointerEventHandler(document);\n\n      this.dragListenerKeys_.push(\n        listen(this.documentPointerEventHandler_,\n          MapBrowserEventType.POINTERMOVE,\n          this.handlePointerMove_, this),\n        listen(this.documentPointerEventHandler_,\n          MapBrowserEventType.POINTERUP,\n          this.handlePointerUp_, this),\n        /* Note that the listener for `pointercancel is set up on\n         * `pointerEventHandler_` and not `documentPointerEventHandler_` like\n         * the `pointerup` and `pointermove` listeners.\n         *\n         * The reason for this is the following: `TouchSource.vacuumTouches_()`\n         * issues `pointercancel` events, when there was no `touchend` for a\n         * `touchstart`. Now, let's say a first `touchstart` is registered on\n         * `pointerEventHandler_`. The `documentPointerEventHandler_` is set up.\n         * But `documentPointerEventHandler_` doesn't know about the first\n         * `touchstart`. If there is no `touchend` for the `touchstart`, we can\n         * only receive a `touchcancel` from `pointerEventHandler_`, because it is\n         * only registered there.\n         */\n        listen(this.pointerEventHandler_,\n          MapBrowserEventType.POINTERCANCEL,\n          this.handlePointerUp_, this)\n      );\n    }\n  }\n\n  /**\n   * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer\n   * event.\n   * @private\n   */\n  handlePointerMove_(pointerEvent) {\n    // Between pointerdown and pointerup, pointermove events are triggered.\n    // To avoid a 'false' touchmove event to be dispatched, we test if the pointer\n    // moved a significant distance.\n    if (this.isMoving_(pointerEvent)) {\n      this.dragging_ = true;\n      const newEvent = new MapBrowserPointerEvent(\n        MapBrowserEventType.POINTERDRAG, this.map_, pointerEvent,\n        this.dragging_);\n      this.dispatchEvent(newEvent);\n    }\n\n    // Some native android browser triggers mousemove events during small period\n    // of time. See: https://code.google.com/p/android/issues/detail?id=5491 or\n    // https://code.google.com/p/android/issues/detail?id=19827\n    // ex: Galaxy Tab P3110 + Android 4.1.1\n    pointerEvent.preventDefault();\n  }\n\n  /**\n   * Wrap and relay a pointer event.  Note that this requires that the type\n   * string for the MapBrowserPointerEvent matches the PointerEvent type.\n   * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer\n   * event.\n   * @private\n   */\n  relayEvent_(pointerEvent) {\n    const dragging = !!(this.down_ && this.isMoving_(pointerEvent));\n    this.dispatchEvent(new MapBrowserPointerEvent(\n      pointerEvent.type, this.map_, pointerEvent, dragging));\n  }\n\n  /**\n   * @param {module:ol/pointer/PointerEvent} pointerEvent Pointer\n   * event.\n   * @return {boolean} Is moving.\n   * @private\n   */\n  isMoving_(pointerEvent) {\n    return this.dragging_ ||\n        Math.abs(pointerEvent.clientX - this.down_.clientX) > this.moveTolerance_ ||\n        Math.abs(pointerEvent.clientY - this.down_.clientY) > this.moveTolerance_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    if (this.relayedListenerKey_) {\n      unlistenByKey(this.relayedListenerKey_);\n      this.relayedListenerKey_ = null;\n    }\n    if (this.pointerdownListenerKey_) {\n      unlistenByKey(this.pointerdownListenerKey_);\n      this.pointerdownListenerKey_ = null;\n    }\n\n    this.dragListenerKeys_.forEach(unlistenByKey);\n    this.dragListenerKeys_.length = 0;\n\n    if (this.documentPointerEventHandler_) {\n      this.documentPointerEventHandler_.dispose();\n      this.documentPointerEventHandler_ = null;\n    }\n    if (this.pointerEventHandler_) {\n      this.pointerEventHandler_.dispose();\n      this.pointerEventHandler_ = null;\n    }\n    super.disposeInternal();\n  }\n}\n\n\nexport default MapBrowserEventHandler;\n","/**\n * @module ol/MapEventType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n\n  /**\n   * Triggered after a map frame is rendered.\n   * @event module:ol/MapEvent~MapEvent#postrender\n   * @api\n   */\n  POSTRENDER: 'postrender',\n\n  /**\n   * Triggered when the map starts moving.\n   * @event module:ol/MapEvent~MapEvent#movestart\n   * @api\n   */\n  MOVESTART: 'movestart',\n\n  /**\n   * Triggered after the map is moved.\n   * @event module:ol/MapEvent~MapEvent#moveend\n   * @api\n   */\n  MOVEEND: 'moveend'\n\n};\n","/**\n * @module ol/MapProperty\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  LAYERGROUP: 'layergroup',\n  SIZE: 'size',\n  TARGET: 'target',\n  VIEW: 'view'\n};\n","/**\n * @module ol/structs/PriorityQueue\n */\nimport {assert} from '../asserts.js';\nimport {clear} from '../obj.js';\n\n\n/**\n * @type {number}\n */\nexport const DROP = Infinity;\n\n\n/**\n * @classdesc\n * Priority queue.\n *\n * The implementation is inspired from the Closure Library's Heap class and\n * Python's heapq module.\n *\n * See http://closure-library.googlecode.com/svn/docs/closure_goog_structs_heap.js.source.html\n * and http://hg.python.org/cpython/file/2.7/Lib/heapq.py.\n *\n * @template T\n */\nclass PriorityQueue {\n\n  /**\n   * @param {function(T): number} priorityFunction Priority function.\n   * @param {function(T): string} keyFunction Key function.\n   */\n  constructor(priorityFunction, keyFunction) {\n\n    /**\n     * @type {function(T): number}\n     * @private\n     */\n    this.priorityFunction_ = priorityFunction;\n\n    /**\n     * @type {function(T): string}\n     * @private\n     */\n    this.keyFunction_ = keyFunction;\n\n    /**\n     * @type {Array<T>}\n     * @private\n     */\n    this.elements_ = [];\n\n    /**\n     * @type {Array<number>}\n     * @private\n     */\n    this.priorities_ = [];\n\n    /**\n     * @type {!Object<string, boolean>}\n     * @private\n     */\n    this.queuedElements_ = {};\n\n  }\n\n  /**\n   * FIXME empty description for jsdoc\n   */\n  clear() {\n    this.elements_.length = 0;\n    this.priorities_.length = 0;\n    clear(this.queuedElements_);\n  }\n\n\n  /**\n   * Remove and return the highest-priority element. O(log N).\n   * @return {T} Element.\n   */\n  dequeue() {\n    const elements = this.elements_;\n    const priorities = this.priorities_;\n    const element = elements[0];\n    if (elements.length == 1) {\n      elements.length = 0;\n      priorities.length = 0;\n    } else {\n      elements[0] = elements.pop();\n      priorities[0] = priorities.pop();\n      this.siftUp_(0);\n    }\n    const elementKey = this.keyFunction_(element);\n    delete this.queuedElements_[elementKey];\n    return element;\n  }\n\n\n  /**\n   * Enqueue an element. O(log N).\n   * @param {T} element Element.\n   * @return {boolean} The element was added to the queue.\n   */\n  enqueue(element) {\n    assert(!(this.keyFunction_(element) in this.queuedElements_),\n      31); // Tried to enqueue an `element` that was already added to the queue\n    const priority = this.priorityFunction_(element);\n    if (priority != DROP) {\n      this.elements_.push(element);\n      this.priorities_.push(priority);\n      this.queuedElements_[this.keyFunction_(element)] = true;\n      this.siftDown_(0, this.elements_.length - 1);\n      return true;\n    }\n    return false;\n  }\n\n\n  /**\n   * @return {number} Count.\n   */\n  getCount() {\n    return this.elements_.length;\n  }\n\n\n  /**\n   * Gets the index of the left child of the node at the given index.\n   * @param {number} index The index of the node to get the left child for.\n   * @return {number} The index of the left child.\n   * @private\n   */\n  getLeftChildIndex_(index) {\n    return index * 2 + 1;\n  }\n\n\n  /**\n   * Gets the index of the right child of the node at the given index.\n   * @param {number} index The index of the node to get the right child for.\n   * @return {number} The index of the right child.\n   * @private\n   */\n  getRightChildIndex_(index) {\n    return index * 2 + 2;\n  }\n\n\n  /**\n   * Gets the index of the parent of the node at the given index.\n   * @param {number} index The index of the node to get the parent for.\n   * @return {number} The index of the parent.\n   * @private\n   */\n  getParentIndex_(index) {\n    return (index - 1) >> 1;\n  }\n\n\n  /**\n   * Make this a heap. O(N).\n   * @private\n   */\n  heapify_() {\n    let i;\n    for (i = (this.elements_.length >> 1) - 1; i >= 0; i--) {\n      this.siftUp_(i);\n    }\n  }\n\n\n  /**\n   * @return {boolean} Is empty.\n   */\n  isEmpty() {\n    return this.elements_.length === 0;\n  }\n\n\n  /**\n   * @param {string} key Key.\n   * @return {boolean} Is key queued.\n   */\n  isKeyQueued(key) {\n    return key in this.queuedElements_;\n  }\n\n\n  /**\n   * @param {T} element Element.\n   * @return {boolean} Is queued.\n   */\n  isQueued(element) {\n    return this.isKeyQueued(this.keyFunction_(element));\n  }\n\n\n  /**\n   * @param {number} index The index of the node to move down.\n   * @private\n   */\n  siftUp_(index) {\n    const elements = this.elements_;\n    const priorities = this.priorities_;\n    const count = elements.length;\n    const element = elements[index];\n    const priority = priorities[index];\n    const startIndex = index;\n\n    while (index < (count >> 1)) {\n      const lIndex = this.getLeftChildIndex_(index);\n      const rIndex = this.getRightChildIndex_(index);\n\n      const smallerChildIndex = rIndex < count &&\n          priorities[rIndex] < priorities[lIndex] ?\n        rIndex : lIndex;\n\n      elements[index] = elements[smallerChildIndex];\n      priorities[index] = priorities[smallerChildIndex];\n      index = smallerChildIndex;\n    }\n\n    elements[index] = element;\n    priorities[index] = priority;\n    this.siftDown_(startIndex, index);\n  }\n\n\n  /**\n   * @param {number} startIndex The index of the root.\n   * @param {number} index The index of the node to move up.\n   * @private\n   */\n  siftDown_(startIndex, index) {\n    const elements = this.elements_;\n    const priorities = this.priorities_;\n    const element = elements[index];\n    const priority = priorities[index];\n\n    while (index > startIndex) {\n      const parentIndex = this.getParentIndex_(index);\n      if (priorities[parentIndex] > priority) {\n        elements[index] = elements[parentIndex];\n        priorities[index] = priorities[parentIndex];\n        index = parentIndex;\n      } else {\n        break;\n      }\n    }\n    elements[index] = element;\n    priorities[index] = priority;\n  }\n\n\n  /**\n   * FIXME empty description for jsdoc\n   */\n  reprioritize() {\n    const priorityFunction = this.priorityFunction_;\n    const elements = this.elements_;\n    const priorities = this.priorities_;\n    let index = 0;\n    const n = elements.length;\n    let element, i, priority;\n    for (i = 0; i < n; ++i) {\n      element = elements[i];\n      priority = priorityFunction(element);\n      if (priority == DROP) {\n        delete this.queuedElements_[this.keyFunction_(element)];\n      } else {\n        priorities[index] = priority;\n        elements[index++] = element;\n      }\n    }\n    elements.length = index;\n    priorities.length = index;\n    this.heapify_();\n  }\n\n}\n\n\nexport default PriorityQueue;\n","/**\n * @module ol/TileQueue\n */\nimport TileState from './TileState.js';\nimport {listen, unlisten} from './events.js';\nimport EventType from './events/EventType.js';\nimport PriorityQueue from './structs/PriorityQueue.js';\n\n\n/**\n * @typedef {function(module:ol/Tile, string, module:ol/coordinate~Coordinate, number): number} PriorityFunction\n */\n\n\nclass TileQueue extends PriorityQueue {\n\n  /**\n   * @param {module:ol/TileQueue~PriorityFunction} tilePriorityFunction Tile priority function.\n   * @param {function(): ?} tileChangeCallback Function called on each tile change event.\n   */\n  constructor(tilePriorityFunction, tileChangeCallback) {\n\n    super(\n      /**\n       * @param {Array} element Element.\n       * @return {number} Priority.\n       */\n      function(element) {\n        return tilePriorityFunction.apply(null, element);\n      },\n      /**\n       * @param {Array} element Element.\n       * @return {string} Key.\n       */\n      function(element) {\n        return (/** @type {module:ol/Tile} */ (element[0]).getKey());\n      });\n\n    /**\n     * @private\n     * @type {function(): ?}\n     */\n    this.tileChangeCallback_ = tileChangeCallback;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.tilesLoading_ = 0;\n\n    /**\n     * @private\n     * @type {!Object<string,boolean>}\n     */\n    this.tilesLoadingKeys_ = {};\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  enqueue(element) {\n    const added = super.enqueue(element);\n    if (added) {\n      const tile = element[0];\n      listen(tile, EventType.CHANGE, this.handleTileChange, this);\n    }\n    return added;\n  }\n\n  /**\n   * @return {number} Number of tiles loading.\n   */\n  getTilesLoading() {\n    return this.tilesLoading_;\n  }\n\n  /**\n   * @param {module:ol/events/Event} event Event.\n   * @protected\n   */\n  handleTileChange(event) {\n    const tile = /** @type {module:ol/Tile} */ (event.target);\n    const state = tile.getState();\n    if (state === TileState.LOADED || state === TileState.ERROR ||\n        state === TileState.EMPTY || state === TileState.ABORT) {\n      unlisten(tile, EventType.CHANGE, this.handleTileChange, this);\n      const tileKey = tile.getKey();\n      if (tileKey in this.tilesLoadingKeys_) {\n        delete this.tilesLoadingKeys_[tileKey];\n        --this.tilesLoading_;\n      }\n      this.tileChangeCallback_();\n    }\n  }\n\n  /**\n   * @param {number} maxTotalLoading Maximum number tiles to load simultaneously.\n   * @param {number} maxNewLoads Maximum number of new tiles to load.\n   */\n  loadMoreTiles(maxTotalLoading, maxNewLoads) {\n    let newLoads = 0;\n    let abortedTiles = false;\n    let state, tile, tileKey;\n    while (this.tilesLoading_ < maxTotalLoading && newLoads < maxNewLoads &&\n           this.getCount() > 0) {\n      tile = /** @type {module:ol/Tile} */ (this.dequeue()[0]);\n      tileKey = tile.getKey();\n      state = tile.getState();\n      if (state === TileState.ABORT) {\n        abortedTiles = true;\n      } else if (state === TileState.IDLE && !(tileKey in this.tilesLoadingKeys_)) {\n        this.tilesLoadingKeys_[tileKey] = true;\n        ++this.tilesLoading_;\n        ++newLoads;\n        tile.load();\n      }\n    }\n    if (newLoads === 0 && abortedTiles) {\n      // Do not stop the render loop when all wanted tiles were aborted due to\n      // a small, saturated tile cache.\n      this.tileChangeCallback_();\n    }\n  }\n}\n\n\nexport default TileQueue;\n","/**\n * @module ol/layer/Group\n */\nimport {getUid} from '../util.js';\nimport Collection from '../Collection.js';\nimport CollectionEventType from '../CollectionEventType.js';\nimport {getChangeEventType} from '../Object.js';\nimport ObjectEventType from '../ObjectEventType.js';\nimport {assert} from '../asserts.js';\nimport {listen, unlistenByKey} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {getIntersection} from '../extent.js';\nimport BaseLayer from '../layer/Base.js';\nimport {assign, clear} from '../obj.js';\nimport SourceState from '../source/State.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [opacity=1] Opacity (0, 1).\n * @property {boolean} [visible=true] Visibility.\n * @property {module:ol/extent~Extent} [extent] The bounding extent for layer rendering.  The layer will not be\n * rendered outside of this extent.\n * @property {number} [zIndex=0] The z-index for layer rendering.  At rendering time, the layers\n * will be ordered, first by Z-index and then by position.\n * @property {number} [minResolution] The minimum resolution (inclusive) at which this layer will be\n * visible.\n * @property {number} [maxResolution] The maximum resolution (exclusive) below which this layer will\n * be visible.\n * @property {Array<module:ol/layer/Base>|module:ol/Collection<module:ol/layer/Base>} [layers] Child layers.\n */\n\n\n/**\n * @enum {string}\n * @private\n */\nconst Property = {\n  LAYERS: 'layers'\n};\n\n\n/**\n * @classdesc\n * A {@link module:ol/Collection~Collection} of layers that are handled together.\n *\n * A generic `change` event is triggered when the group/Collection changes.\n *\n * @api\n */\nclass LayerGroup extends BaseLayer {\n  /**\n   * @param {module:ol/layer/Group~Options=} opt_options Layer options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n    const baseOptions = /** @type {module:ol/layer/Group~Options} */ (assign({}, options));\n    delete baseOptions.layers;\n\n    let layers = options.layers;\n\n    super(baseOptions);\n\n    /**\n     * @private\n     * @type {Array<module:ol/events~EventsKey>}\n     */\n    this.layersListenerKeys_ = [];\n\n    /**\n     * @private\n     * @type {Object<string, Array<module:ol/events~EventsKey>>}\n     */\n    this.listenerKeys_ = {};\n\n    listen(this,\n      getChangeEventType(Property.LAYERS),\n      this.handleLayersChanged_, this);\n\n    if (layers) {\n      if (Array.isArray(layers)) {\n        layers = new Collection(layers.slice(), {unique: true});\n      } else {\n        assert(layers instanceof Collection,\n          43); // Expected `layers` to be an array or a `Collection`\n        layers = layers;\n      }\n    } else {\n      layers = new Collection(undefined, {unique: true});\n    }\n\n    this.setLayers(layers);\n\n  }\n\n  /**\n   * @private\n   */\n  handleLayerChange_() {\n    this.changed();\n  }\n\n  /**\n   * @param {module:ol/events/Event} event Event.\n   * @private\n   */\n  handleLayersChanged_() {\n    this.layersListenerKeys_.forEach(unlistenByKey);\n    this.layersListenerKeys_.length = 0;\n\n    const layers = this.getLayers();\n    this.layersListenerKeys_.push(\n      listen(layers, CollectionEventType.ADD, this.handleLayersAdd_, this),\n      listen(layers, CollectionEventType.REMOVE, this.handleLayersRemove_, this)\n    );\n\n    for (const id in this.listenerKeys_) {\n      this.listenerKeys_[id].forEach(unlistenByKey);\n    }\n    clear(this.listenerKeys_);\n\n    const layersArray = layers.getArray();\n    for (let i = 0, ii = layersArray.length; i < ii; i++) {\n      const layer = layersArray[i];\n      this.listenerKeys_[getUid(layer).toString()] = [\n        listen(layer, ObjectEventType.PROPERTYCHANGE, this.handleLayerChange_, this),\n        listen(layer, EventType.CHANGE, this.handleLayerChange_, this)\n      ];\n    }\n\n    this.changed();\n  }\n\n  /**\n   * @param {module:ol/Collection~CollectionEvent} collectionEvent CollectionEvent.\n   * @private\n   */\n  handleLayersAdd_(collectionEvent) {\n    const layer = /** @type {module:ol/layer/Base} */ (collectionEvent.element);\n    const key = getUid(layer).toString();\n    this.listenerKeys_[key] = [\n      listen(layer, ObjectEventType.PROPERTYCHANGE, this.handleLayerChange_, this),\n      listen(layer, EventType.CHANGE, this.handleLayerChange_, this)\n    ];\n    this.changed();\n  }\n\n  /**\n   * @param {module:ol/Collection~CollectionEvent} collectionEvent CollectionEvent.\n   * @private\n   */\n  handleLayersRemove_(collectionEvent) {\n    const layer = /** @type {module:ol/layer/Base} */ (collectionEvent.element);\n    const key = getUid(layer).toString();\n    this.listenerKeys_[key].forEach(unlistenByKey);\n    delete this.listenerKeys_[key];\n    this.changed();\n  }\n\n  /**\n   * Returns the {@link module:ol/Collection collection} of {@link module:ol/layer/Layer~Layer layers}\n   * in this group.\n   * @return {!module:ol/Collection<module:ol/layer/Base>} Collection of\n   *   {@link module:ol/layer/Base layers} that are part of this group.\n   * @observable\n   * @api\n   */\n  getLayers() {\n    return (\n      /** @type {!module:ol/Collection<module:ol/layer/Base>} */ (this.get(Property.LAYERS))\n    );\n  }\n\n  /**\n   * Set the {@link module:ol/Collection collection} of {@link module:ol/layer/Layer~Layer layers}\n   * in this group.\n   * @param {!module:ol/Collection<module:ol/layer/Base>} layers Collection of\n   *   {@link module:ol/layer/Base layers} that are part of this group.\n   * @observable\n   * @api\n   */\n  setLayers(layers) {\n    this.set(Property.LAYERS, layers);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getLayersArray(opt_array) {\n    const array = opt_array !== undefined ? opt_array : [];\n    this.getLayers().forEach(function(layer) {\n      layer.getLayersArray(array);\n    });\n    return array;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getLayerStatesArray(opt_states) {\n    const states = opt_states !== undefined ? opt_states : [];\n\n    const pos = states.length;\n\n    this.getLayers().forEach(function(layer) {\n      layer.getLayerStatesArray(states);\n    });\n\n    const ownLayerState = this.getLayerState();\n    for (let i = pos, ii = states.length; i < ii; i++) {\n      const layerState = states[i];\n      layerState.opacity *= ownLayerState.opacity;\n      layerState.visible = layerState.visible && ownLayerState.visible;\n      layerState.maxResolution = Math.min(\n        layerState.maxResolution, ownLayerState.maxResolution);\n      layerState.minResolution = Math.max(\n        layerState.minResolution, ownLayerState.minResolution);\n      if (ownLayerState.extent !== undefined) {\n        if (layerState.extent !== undefined) {\n          layerState.extent = getIntersection(layerState.extent, ownLayerState.extent);\n        } else {\n          layerState.extent = ownLayerState.extent;\n        }\n      }\n    }\n\n    return states;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSourceState() {\n    return SourceState.READY;\n  }\n}\n\n\nexport default LayerGroup;\n","/**\n * @module ol/PluggableMap\n */\nimport {getUid} from './util.js';\nimport Collection from './Collection.js';\nimport CollectionEventType from './CollectionEventType.js';\nimport MapBrowserEvent from './MapBrowserEvent.js';\nimport MapBrowserEventHandler from './MapBrowserEventHandler.js';\nimport MapBrowserEventType from './MapBrowserEventType.js';\nimport MapEvent from './MapEvent.js';\nimport MapEventType from './MapEventType.js';\nimport MapProperty from './MapProperty.js';\nimport RenderEventType from './render/EventType.js';\nimport BaseObject, {getChangeEventType} from './Object.js';\nimport ObjectEventType from './ObjectEventType.js';\nimport TileQueue from './TileQueue.js';\nimport View from './View.js';\nimport ViewHint from './ViewHint.js';\nimport {assert} from './asserts.js';\nimport {removeNode} from './dom.js';\nimport {listen, unlistenByKey, unlisten} from './events.js';\nimport {stopPropagation} from './events/Event.js';\nimport EventType from './events/EventType.js';\nimport {createEmpty, clone, createOrUpdateEmpty, equals, getForViewAndSize, isEmpty} from './extent.js';\nimport {TRUE} from './functions.js';\nimport {DEVICE_PIXEL_RATIO, TOUCH} from './has.js';\nimport LayerGroup from './layer/Group.js';\nimport {hasArea} from './size.js';\nimport {DROP} from './structs/PriorityQueue.js';\nimport {create as createTransform, apply as applyTransform} from './transform.js';\n\n\n/**\n * State of the current frame. Only `pixelRatio`, `time` and `viewState` should\n * be used in applications.\n * @typedef {Object} FrameState\n * @property {number} pixelRatio The pixel ratio of the frame.\n * @property {number} time The time when rendering of the frame was requested.\n * @property {module:ol/View~State} viewState The state of the current view.\n * @property {boolean} animate\n * @property {module:ol/transform~Transform} coordinateToPixelTransform\n * @property {null|module:ol/extent~Extent} extent\n * @property {module:ol/coordinate~Coordinate} focus\n * @property {number} index\n * @property {Object<number, module:ol/layer/Layer~State>} layerStates\n * @property {Array<module:ol/layer/Layer~State>} layerStatesArray\n * @property {module:ol/transform~Transform} pixelToCoordinateTransform\n * @property {Array<module:ol/PluggableMap~PostRenderFunction>} postRenderFunctions\n * @property {module:ol/size~Size} size\n * @property {!Object<string, boolean>} skippedFeatureUids\n * @property {module:ol/TileQueue} tileQueue\n * @property {Object<string, Object<string, module:ol/TileRange>>} usedTiles\n * @property {Array<number>} viewHints\n * @property {!Object<string, Object<string, boolean>>} wantedTiles\n */\n\n\n/**\n * @typedef {function(module:ol/PluggableMap, ?module:ol/PluggableMap~FrameState): boolean} PostRenderFunction\n */\n\n\n/**\n * @typedef {Object} AtPixelOptions\n * @property {undefined|function(module:ol/layer/Layer): boolean} layerFilter Layer filter\n * function. The filter function will receive one argument, the\n * {@link module:ol/layer/Layer layer-candidate} and it should return a boolean value.\n * Only layers which are visible and for which this function returns `true`\n * will be tested for features. By default, all visible layers will be tested.\n * @property {number} [hitTolerance=0] Hit-detection tolerance in pixels. Pixels\n * inside the radius around the given position will be checked for features. This only\n * works for the canvas renderer and not for WebGL.\n */\n\n\n/**\n * @typedef {Object} MapOptionsInternal\n * @property {module:ol/Collection<module:ol/control/Control>} [controls]\n * @property {module:ol/Collection<module:ol/interaction/Interaction>} [interactions]\n * @property {HTMLElement|Document} keyboardEventTarget\n * @property {module:ol/Collection<module:ol/Overlay>} overlays\n * @property {Object<string, *>} values\n */\n\n\n/**\n * Object literal with config options for the map.\n * @typedef {Object} MapOptions\n * @property {module:ol/Collection<module:ol/control/Control>|Array<module:ol/control/Control>} [controls]\n * Controls initially added to the map. If not specified,\n * {@link module:ol/control/util~defaults} is used.\n * @property {number} [pixelRatio=window.devicePixelRatio] The ratio between\n * physical pixels and device-independent pixels (dips) on the device.\n * @property {module:ol/Collection<module:ol/interaction/Interaction>|Array<module:ol/interaction/Interaction>} [interactions]\n * Interactions that are initially added to the map. If not specified,\n * {@link module:ol/interaction~defaults} is used.\n * @property {HTMLElement|Document|string} [keyboardEventTarget] The element to\n * listen to keyboard events on. This determines when the `KeyboardPan` and\n * `KeyboardZoom` interactions trigger. For example, if this option is set to\n * `document` the keyboard interactions will always trigger. If this option is\n * not specified, the element the library listens to keyboard events on is the\n * map target (i.e. the user-provided div for the map). If this is not\n * `document`, the target element needs to be focused for key events to be\n * emitted, requiring that the target element has a `tabindex` attribute.\n * @property {Array<module:ol/layer/Base>|module:ol/Collection<module:ol/layer/Base>} [layers]\n * Layers. If this is not defined, a map with no layers will be rendered. Note\n * that layers are rendered in the order supplied, so if you want, for example,\n * a vector layer to appear on top of a tile layer, it must come after the tile\n * layer.\n * @property {number} [maxTilesLoading=16] Maximum number tiles to load\n * simultaneously.\n * @property {boolean} [loadTilesWhileAnimating=false] When set to `true`, tiles\n * will be loaded during animations. This may improve the user experience, but\n * can also make animations stutter on devices with slow memory.\n * @property {boolean} [loadTilesWhileInteracting=false] When set to `true`,\n * tiles will be loaded while interacting with the map. This may improve the\n * user experience, but can also make map panning and zooming choppy on devices\n * with slow memory.\n * @property {number} [moveTolerance=1] The minimum distance in pixels the\n * cursor must move to be detected as a map move event instead of a click.\n * Increasing this value can make it easier to click on the map.\n * @property {module:ol/Collection<module:ol/Overlay>|Array<module:ol/Overlay>} [overlays]\n * Overlays initially added to the map. By default, no overlays are added.\n * @property {HTMLElement|string} [target] The container for the map, either the\n * element itself or the `id` of the element. If not specified at construction\n * time, {@link module:ol/Map~Map#setTarget} must be called for the map to be\n * rendered.\n * @property {module:ol/View} [view] The map's view.  No layer sources will be\n * fetched unless this is specified at construction time or through\n * {@link module:ol/Map~Map#setView}.\n */\n\n\n/**\n * @fires module:ol/MapBrowserEvent~MapBrowserEvent\n * @fires module:ol/MapEvent~MapEvent\n * @fires module:ol/render/Event~RenderEvent#postcompose\n * @fires module:ol/render/Event~RenderEvent#precompose\n * @fires module:ol/render/Event~RenderEvent#rendercomplete\n * @api\n */\nclass PluggableMap extends BaseObject {\n\n  /**\n   * @param {module:ol/PluggableMap~MapOptions} options Map options.\n   */\n  constructor(options) {\n\n    super();\n\n    const optionsInternal = createOptionsInternal(options);\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.maxTilesLoading_ = options.maxTilesLoading !== undefined ? options.maxTilesLoading : 16;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.loadTilesWhileAnimating_ =\n        options.loadTilesWhileAnimating !== undefined ?\n          options.loadTilesWhileAnimating : false;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.loadTilesWhileInteracting_ =\n        options.loadTilesWhileInteracting !== undefined ?\n          options.loadTilesWhileInteracting : false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.pixelRatio_ = options.pixelRatio !== undefined ?\n      options.pixelRatio : DEVICE_PIXEL_RATIO;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.animationDelayKey_;\n\n    /**\n     * @private\n     */\n    this.animationDelay_ = function() {\n      this.animationDelayKey_ = undefined;\n      this.renderFrame_.call(this, Date.now());\n    }.bind(this);\n\n    /**\n     * @private\n     * @type {module:ol/transform~Transform}\n     */\n    this.coordinateToPixelTransform_ = createTransform();\n\n    /**\n     * @private\n     * @type {module:ol/transform~Transform}\n     */\n    this.pixelToCoordinateTransform_ = createTransform();\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.frameIndex_ = 0;\n\n    /**\n     * @private\n     * @type {?module:ol/PluggableMap~FrameState}\n     */\n    this.frameState_ = null;\n\n    /**\n     * The extent at the previous 'moveend' event.\n     * @private\n     * @type {module:ol/extent~Extent}\n     */\n    this.previousExtent_ = null;\n\n    /**\n     * @private\n     * @type {?module:ol/events~EventsKey}\n     */\n    this.viewPropertyListenerKey_ = null;\n\n    /**\n     * @private\n     * @type {?module:ol/events~EventsKey}\n     */\n    this.viewChangeListenerKey_ = null;\n\n    /**\n     * @private\n     * @type {Array<module:ol/events~EventsKey>}\n     */\n    this.layerGroupPropertyListenerKeys_ = null;\n\n    /**\n     * @private\n     * @type {!HTMLElement}\n     */\n    this.viewport_ = document.createElement('div');\n    this.viewport_.className = 'ol-viewport' + (TOUCH ? ' ol-touch' : '');\n    this.viewport_.style.position = 'relative';\n    this.viewport_.style.overflow = 'hidden';\n    this.viewport_.style.width = '100%';\n    this.viewport_.style.height = '100%';\n    // prevent page zoom on IE >= 10 browsers\n    this.viewport_.style.msTouchAction = 'none';\n    this.viewport_.style.touchAction = 'none';\n\n    /**\n     * @private\n     * @type {!HTMLElement}\n     */\n    this.overlayContainer_ = document.createElement('div');\n    this.overlayContainer_.className = 'ol-overlaycontainer';\n    this.viewport_.appendChild(this.overlayContainer_);\n\n    /**\n     * @private\n     * @type {!HTMLElement}\n     */\n    this.overlayContainerStopEvent_ = document.createElement('div');\n    this.overlayContainerStopEvent_.className = 'ol-overlaycontainer-stopevent';\n    const overlayEvents = [\n      EventType.CLICK,\n      EventType.DBLCLICK,\n      EventType.MOUSEDOWN,\n      EventType.TOUCHSTART,\n      EventType.MSPOINTERDOWN,\n      MapBrowserEventType.POINTERDOWN,\n      EventType.MOUSEWHEEL,\n      EventType.WHEEL\n    ];\n    for (let i = 0, ii = overlayEvents.length; i < ii; ++i) {\n      listen(this.overlayContainerStopEvent_, overlayEvents[i], stopPropagation);\n    }\n    this.viewport_.appendChild(this.overlayContainerStopEvent_);\n\n    /**\n     * @private\n     * @type {module:ol/MapBrowserEventHandler}\n     */\n    this.mapBrowserEventHandler_ = new MapBrowserEventHandler(this, options.moveTolerance);\n    for (const key in MapBrowserEventType) {\n      listen(this.mapBrowserEventHandler_, MapBrowserEventType[key],\n        this.handleMapBrowserEvent, this);\n    }\n\n    /**\n     * @private\n     * @type {HTMLElement|Document}\n     */\n    this.keyboardEventTarget_ = optionsInternal.keyboardEventTarget;\n\n    /**\n     * @private\n     * @type {Array<module:ol/events~EventsKey>}\n     */\n    this.keyHandlerKeys_ = null;\n\n    listen(this.viewport_, EventType.CONTEXTMENU, this.handleBrowserEvent, this);\n    listen(this.viewport_, EventType.WHEEL, this.handleBrowserEvent, this);\n    listen(this.viewport_, EventType.MOUSEWHEEL, this.handleBrowserEvent, this);\n\n    /**\n     * @type {module:ol/Collection<module:ol/control/Control>}\n     * @protected\n     */\n    this.controls = optionsInternal.controls || new Collection();\n\n    /**\n     * @type {module:ol/Collection<module:ol/interaction/Interaction>}\n     * @protected\n     */\n    this.interactions = optionsInternal.interactions || new Collection();\n\n    /**\n     * @type {module:ol/Collection<module:ol/Overlay>}\n     * @private\n     */\n    this.overlays_ = optionsInternal.overlays;\n\n    /**\n     * A lookup of overlays by id.\n     * @private\n     * @type {Object<string, module:ol/Overlay>}\n     */\n    this.overlayIdIndex_ = {};\n\n    /**\n     * @type {module:ol/renderer/Map}\n     * @private\n     */\n    this.renderer_ = this.createRenderer();\n\n    /**\n     * @type {function(Event)|undefined}\n     * @private\n     */\n    this.handleResize_;\n\n    /**\n     * @private\n     * @type {module:ol/coordinate~Coordinate}\n     */\n    this.focus_ = null;\n\n    /**\n     * @private\n     * @type {!Array<module:ol/PluggableMap~PostRenderFunction>}\n     */\n    this.postRenderFunctions_ = [];\n\n    /**\n     * @private\n     * @type {module:ol/TileQueue}\n     */\n    this.tileQueue_ = new TileQueue(\n      this.getTilePriority.bind(this),\n      this.handleTileChange_.bind(this));\n\n    /**\n     * Uids of features to skip at rendering time.\n     * @type {Object<string, boolean>}\n     * @private\n     */\n    this.skippedFeatureUids_ = {};\n\n    listen(\n      this, getChangeEventType(MapProperty.LAYERGROUP),\n      this.handleLayerGroupChanged_, this);\n    listen(this, getChangeEventType(MapProperty.VIEW),\n      this.handleViewChanged_, this);\n    listen(this, getChangeEventType(MapProperty.SIZE),\n      this.handleSizeChanged_, this);\n    listen(this, getChangeEventType(MapProperty.TARGET),\n      this.handleTargetChanged_, this);\n\n    // setProperties will trigger the rendering of the map if the map\n    // is \"defined\" already.\n    this.setProperties(optionsInternal.values);\n\n    this.controls.forEach(\n      /**\n       * @param {module:ol/control/Control} control Control.\n       * @this {module:ol/PluggableMap}\n       */\n      (function(control) {\n        control.setMap(this);\n      }).bind(this));\n\n    listen(this.controls, CollectionEventType.ADD,\n      /**\n       * @param {module:ol/Collection~CollectionEvent} event CollectionEvent.\n       */\n      function(event) {\n        event.element.setMap(this);\n      }, this);\n\n    listen(this.controls, CollectionEventType.REMOVE,\n      /**\n       * @param {module:ol/Collection~CollectionEvent} event CollectionEvent.\n       */\n      function(event) {\n        event.element.setMap(null);\n      }, this);\n\n    this.interactions.forEach(\n      /**\n       * @param {module:ol/interaction/Interaction} interaction Interaction.\n       * @this {module:ol/PluggableMap}\n       */\n      (function(interaction) {\n        interaction.setMap(this);\n      }).bind(this));\n\n    listen(this.interactions, CollectionEventType.ADD,\n      /**\n       * @param {module:ol/Collection~CollectionEvent} event CollectionEvent.\n       */\n      function(event) {\n        event.element.setMap(this);\n      }, this);\n\n    listen(this.interactions, CollectionEventType.REMOVE,\n      /**\n       * @param {module:ol/Collection~CollectionEvent} event CollectionEvent.\n       */\n      function(event) {\n        event.element.setMap(null);\n      }, this);\n\n    this.overlays_.forEach(this.addOverlayInternal_.bind(this));\n\n    listen(this.overlays_, CollectionEventType.ADD,\n      /**\n       * @param {module:ol/Collection~CollectionEvent} event CollectionEvent.\n       */\n      function(event) {\n        this.addOverlayInternal_(/** @type {module:ol/Overlay} */ (event.element));\n      }, this);\n\n    listen(this.overlays_, CollectionEventType.REMOVE,\n      /**\n       * @param {module:ol/Collection~CollectionEvent} event CollectionEvent.\n       */\n      function(event) {\n        const overlay = /** @type {module:ol/Overlay} */ (event.element);\n        const id = overlay.getId();\n        if (id !== undefined) {\n          delete this.overlayIdIndex_[id.toString()];\n        }\n        event.element.setMap(null);\n      }, this);\n\n  }\n\n  createRenderer() {\n    throw new Error('Use a map type that has a createRenderer method');\n  }\n\n  /**\n   * Add the given control to the map.\n   * @param {module:ol/control/Control} control Control.\n   * @api\n   */\n  addControl(control) {\n    this.getControls().push(control);\n  }\n\n  /**\n   * Add the given interaction to the map.\n   * @param {module:ol/interaction/Interaction} interaction Interaction to add.\n   * @api\n   */\n  addInteraction(interaction) {\n    this.getInteractions().push(interaction);\n  }\n\n  /**\n   * Adds the given layer to the top of this map. If you want to add a layer\n   * elsewhere in the stack, use `getLayers()` and the methods available on\n   * {@link module:ol/Collection~Collection}.\n   * @param {module:ol/layer/Base} layer Layer.\n   * @api\n   */\n  addLayer(layer) {\n    const layers = this.getLayerGroup().getLayers();\n    layers.push(layer);\n  }\n\n  /**\n   * Add the given overlay to the map.\n   * @param {module:ol/Overlay} overlay Overlay.\n   * @api\n   */\n  addOverlay(overlay) {\n    this.getOverlays().push(overlay);\n  }\n\n  /**\n   * This deals with map's overlay collection changes.\n   * @param {module:ol/Overlay} overlay Overlay.\n   * @private\n   */\n  addOverlayInternal_(overlay) {\n    const id = overlay.getId();\n    if (id !== undefined) {\n      this.overlayIdIndex_[id.toString()] = overlay;\n    }\n    overlay.setMap(this);\n  }\n\n  /**\n   *\n   * @inheritDoc\n   */\n  disposeInternal() {\n    this.mapBrowserEventHandler_.dispose();\n    unlisten(this.viewport_, EventType.CONTEXTMENU, this.handleBrowserEvent, this);\n    unlisten(this.viewport_, EventType.WHEEL, this.handleBrowserEvent, this);\n    unlisten(this.viewport_, EventType.MOUSEWHEEL, this.handleBrowserEvent, this);\n    if (this.handleResize_ !== undefined) {\n      removeEventListener(EventType.RESIZE, this.handleResize_, false);\n      this.handleResize_ = undefined;\n    }\n    if (this.animationDelayKey_) {\n      cancelAnimationFrame(this.animationDelayKey_);\n      this.animationDelayKey_ = undefined;\n    }\n    this.setTarget(null);\n    super.disposeInternal();\n  }\n\n  /**\n   * Detect features that intersect a pixel on the viewport, and execute a\n   * callback with each intersecting feature. Layers included in the detection can\n   * be configured through the `layerFilter` option in `opt_options`.\n   * @param {module:ol/pixel~Pixel} pixel Pixel.\n   * @param {function(this: S, (module:ol/Feature|module:ol/render/Feature),\n   *     module:ol/layer/Layer): T} callback Feature callback. The callback will be\n   *     called with two arguments. The first argument is one\n   *     {@link module:ol/Feature feature} or\n   *     {@link module:ol/render/Feature render feature} at the pixel, the second is\n   *     the {@link module:ol/layer/Layer layer} of the feature and will be null for\n   *     unmanaged layers. To stop detection, callback functions can return a\n   *     truthy value.\n   * @param {module:ol/PluggableMap~AtPixelOptions=} opt_options Optional options.\n   * @return {T|undefined} Callback result, i.e. the return value of last\n   * callback execution, or the first truthy callback return value.\n   * @template S,T\n   * @api\n   */\n  forEachFeatureAtPixel(pixel, callback, opt_options) {\n    if (!this.frameState_) {\n      return;\n    }\n    const coordinate = this.getCoordinateFromPixel(pixel);\n    opt_options = opt_options !== undefined ? opt_options : {};\n    const hitTolerance = opt_options.hitTolerance !== undefined ?\n      opt_options.hitTolerance * this.frameState_.pixelRatio : 0;\n    const layerFilter = opt_options.layerFilter !== undefined ?\n      opt_options.layerFilter : TRUE;\n    return this.renderer_.forEachFeatureAtCoordinate(\n      coordinate, this.frameState_, hitTolerance, callback, null,\n      layerFilter, null);\n  }\n\n  /**\n   * Get all features that intersect a pixel on the viewport.\n   * @param {module:ol/pixel~Pixel} pixel Pixel.\n   * @param {module:ol/PluggableMap~AtPixelOptions=} opt_options Optional options.\n   * @return {Array<module:ol/Feature|module:ol/render/Feature>} The detected features or\n   * `null` if none were found.\n   * @api\n   */\n  getFeaturesAtPixel(pixel, opt_options) {\n    let features = null;\n    this.forEachFeatureAtPixel(pixel, function(feature) {\n      if (!features) {\n        features = [];\n      }\n      features.push(feature);\n    }, opt_options);\n    return features;\n  }\n\n  /**\n   * Detect layers that have a color value at a pixel on the viewport, and\n   * execute a callback with each matching layer. Layers included in the\n   * detection can be configured through `opt_layerFilter`.\n   * @param {module:ol/pixel~Pixel} pixel Pixel.\n   * @param {function(this: S, module:ol/layer/Layer, (Uint8ClampedArray|Uint8Array)): T} callback\n   *     Layer callback. This callback will receive two arguments: first is the\n   *     {@link module:ol/layer/Layer layer}, second argument is an array representing\n   *     [R, G, B, A] pixel values (0 - 255) and will be `null` for layer types\n   *     that do not currently support this argument. To stop detection, callback\n   *     functions can return a truthy value.\n   * @param {module:ol/PluggableMap~AtPixelOptions=} opt_options Configuration options.\n   * @return {T|undefined} Callback result, i.e. the return value of last\n   * callback execution, or the first truthy callback return value.\n   * @template S,T\n   * @api\n   */\n  forEachLayerAtPixel(pixel, callback, opt_options) {\n    if (!this.frameState_) {\n      return;\n    }\n    const options = opt_options || {};\n    const hitTolerance = options.hitTolerance !== undefined ?\n      opt_options.hitTolerance * this.frameState_.pixelRatio : 0;\n    const layerFilter = options.layerFilter || TRUE;\n    return this.renderer_.forEachLayerAtPixel(\n      pixel, this.frameState_, hitTolerance, callback, null, layerFilter, null);\n  }\n\n  /**\n   * Detect if features intersect a pixel on the viewport. Layers included in the\n   * detection can be configured through `opt_layerFilter`.\n   * @param {module:ol/pixel~Pixel} pixel Pixel.\n   * @param {module:ol/PluggableMap~AtPixelOptions=} opt_options Optional options.\n   * @return {boolean} Is there a feature at the given pixel?\n   * @template U\n   * @api\n   */\n  hasFeatureAtPixel(pixel, opt_options) {\n    if (!this.frameState_) {\n      return false;\n    }\n    const coordinate = this.getCoordinateFromPixel(pixel);\n    opt_options = opt_options !== undefined ? opt_options : {};\n    const layerFilter = opt_options.layerFilter !== undefined ? opt_options.layerFilter : TRUE;\n    const hitTolerance = opt_options.hitTolerance !== undefined ?\n      opt_options.hitTolerance * this.frameState_.pixelRatio : 0;\n    return this.renderer_.hasFeatureAtCoordinate(\n      coordinate, this.frameState_, hitTolerance, layerFilter, null);\n  }\n\n  /**\n   * Returns the coordinate in view projection for a browser event.\n   * @param {Event} event Event.\n   * @return {module:ol/coordinate~Coordinate} Coordinate.\n   * @api\n   */\n  getEventCoordinate(event) {\n    return this.getCoordinateFromPixel(this.getEventPixel(event));\n  }\n\n  /**\n   * Returns the map pixel position for a browser event relative to the viewport.\n   * @param {Event} event Event.\n   * @return {module:ol/pixel~Pixel} Pixel.\n   * @api\n   */\n  getEventPixel(event) {\n    const viewportPosition = this.viewport_.getBoundingClientRect();\n    const eventPosition = event.changedTouches ? event.changedTouches[0] : event;\n    return [\n      eventPosition.clientX - viewportPosition.left,\n      eventPosition.clientY - viewportPosition.top\n    ];\n  }\n\n  /**\n   * Get the target in which this map is rendered.\n   * Note that this returns what is entered as an option or in setTarget:\n   * if that was an element, it returns an element; if a string, it returns that.\n   * @return {HTMLElement|string|undefined} The Element or id of the Element that the\n   *     map is rendered in.\n   * @observable\n   * @api\n   */\n  getTarget() {\n    return /** @type {HTMLElement|string|undefined} */ (this.get(MapProperty.TARGET));\n  }\n\n  /**\n   * Get the DOM element into which this map is rendered. In contrast to\n   * `getTarget` this method always return an `Element`, or `null` if the\n   * map has no target.\n   * @return {HTMLElement} The element that the map is rendered in.\n   * @api\n   */\n  getTargetElement() {\n    const target = this.getTarget();\n    if (target !== undefined) {\n      return typeof target === 'string' ? document.getElementById(target) : target;\n    } else {\n      return null;\n    }\n  }\n\n  /**\n   * Get the coordinate for a given pixel.  This returns a coordinate in the\n   * map view projection.\n   * @param {module:ol/pixel~Pixel} pixel Pixel position in the map viewport.\n   * @return {module:ol/coordinate~Coordinate} The coordinate for the pixel position.\n   * @api\n   */\n  getCoordinateFromPixel(pixel) {\n    const frameState = this.frameState_;\n    if (!frameState) {\n      return null;\n    } else {\n      return applyTransform(frameState.pixelToCoordinateTransform, pixel.slice());\n    }\n  }\n\n  /**\n   * Get the map controls. Modifying this collection changes the controls\n   * associated with the map.\n   * @return {module:ol/Collection<module:ol/control/Control>} Controls.\n   * @api\n   */\n  getControls() {\n    return this.controls;\n  }\n\n  /**\n   * Get the map overlays. Modifying this collection changes the overlays\n   * associated with the map.\n   * @return {module:ol/Collection<module:ol/Overlay>} Overlays.\n   * @api\n   */\n  getOverlays() {\n    return this.overlays_;\n  }\n\n  /**\n   * Get an overlay by its identifier (the value returned by overlay.getId()).\n   * Note that the index treats string and numeric identifiers as the same. So\n   * `map.getOverlayById(2)` will return an overlay with id `'2'` or `2`.\n   * @param {string|number} id Overlay identifier.\n   * @return {module:ol/Overlay} Overlay.\n   * @api\n   */\n  getOverlayById(id) {\n    const overlay = this.overlayIdIndex_[id.toString()];\n    return overlay !== undefined ? overlay : null;\n  }\n\n  /**\n   * Get the map interactions. Modifying this collection changes the interactions\n   * associated with the map.\n   *\n   * Interactions are used for e.g. pan, zoom and rotate.\n   * @return {module:ol/Collection<module:ol/interaction/Interaction>} Interactions.\n   * @api\n   */\n  getInteractions() {\n    return this.interactions;\n  }\n\n  /**\n   * Get the layergroup associated with this map.\n   * @return {module:ol/layer/Group} A layer group containing the layers in this map.\n   * @observable\n   * @api\n   */\n  getLayerGroup() {\n    return (\n      /** @type {module:ol/layer/Group} */ (this.get(MapProperty.LAYERGROUP))\n    );\n  }\n\n  /**\n   * Get the collection of layers associated with this map.\n   * @return {!module:ol/Collection<module:ol/layer/Base>} Layers.\n   * @api\n   */\n  getLayers() {\n    const layers = this.getLayerGroup().getLayers();\n    return layers;\n  }\n\n  /**\n   * Get the pixel for a coordinate.  This takes a coordinate in the map view\n   * projection and returns the corresponding pixel.\n   * @param {module:ol/coordinate~Coordinate} coordinate A map coordinate.\n   * @return {module:ol/pixel~Pixel} A pixel position in the map viewport.\n   * @api\n   */\n  getPixelFromCoordinate(coordinate) {\n    const frameState = this.frameState_;\n    if (!frameState) {\n      return null;\n    } else {\n      return applyTransform(frameState.coordinateToPixelTransform, coordinate.slice(0, 2));\n    }\n  }\n\n  /**\n   * Get the map renderer.\n   * @return {module:ol/renderer/Map} Renderer\n   */\n  getRenderer() {\n    return this.renderer_;\n  }\n\n  /**\n   * Get the size of this map.\n   * @return {module:ol/size~Size|undefined} The size in pixels of the map in the DOM.\n   * @observable\n   * @api\n   */\n  getSize() {\n    return (\n      /** @type {module:ol/size~Size|undefined} */ (this.get(MapProperty.SIZE))\n    );\n  }\n\n  /**\n   * Get the view associated with this map. A view manages properties such as\n   * center and resolution.\n   * @return {module:ol/View} The view that controls this map.\n   * @observable\n   * @api\n   */\n  getView() {\n    return (\n      /** @type {module:ol/View} */ (this.get(MapProperty.VIEW))\n    );\n  }\n\n  /**\n   * Get the element that serves as the map viewport.\n   * @return {HTMLElement} Viewport.\n   * @api\n   */\n  getViewport() {\n    return this.viewport_;\n  }\n\n  /**\n   * Get the element that serves as the container for overlays.  Elements added to\n   * this container will let mousedown and touchstart events through to the map,\n   * so clicks and gestures on an overlay will trigger {@link module:ol/MapBrowserEvent~MapBrowserEvent}\n   * events.\n   * @return {!HTMLElement} The map's overlay container.\n   */\n  getOverlayContainer() {\n    return this.overlayContainer_;\n  }\n\n  /**\n   * Get the element that serves as a container for overlays that don't allow\n   * event propagation. Elements added to this container won't let mousedown and\n   * touchstart events through to the map, so clicks and gestures on an overlay\n   * don't trigger any {@link module:ol/MapBrowserEvent~MapBrowserEvent}.\n   * @return {!HTMLElement} The map's overlay container that stops events.\n   */\n  getOverlayContainerStopEvent() {\n    return this.overlayContainerStopEvent_;\n  }\n\n  /**\n   * @param {module:ol/Tile} tile Tile.\n   * @param {string} tileSourceKey Tile source key.\n   * @param {module:ol/coordinate~Coordinate} tileCenter Tile center.\n   * @param {number} tileResolution Tile resolution.\n   * @return {number} Tile priority.\n   */\n  getTilePriority(tile, tileSourceKey, tileCenter, tileResolution) {\n    // Filter out tiles at higher zoom levels than the current zoom level, or that\n    // are outside the visible extent.\n    const frameState = this.frameState_;\n    if (!frameState || !(tileSourceKey in frameState.wantedTiles)) {\n      return DROP;\n    }\n    if (!frameState.wantedTiles[tileSourceKey][tile.getKey()]) {\n      return DROP;\n    }\n    // Prioritize the highest zoom level tiles closest to the focus.\n    // Tiles at higher zoom levels are prioritized using Math.log(tileResolution).\n    // Within a zoom level, tiles are prioritized by the distance in pixels\n    // between the center of the tile and the focus.  The factor of 65536 means\n    // that the prioritization should behave as desired for tiles up to\n    // 65536 * Math.log(2) = 45426 pixels from the focus.\n    const deltaX = tileCenter[0] - frameState.focus[0];\n    const deltaY = tileCenter[1] - frameState.focus[1];\n    return 65536 * Math.log(tileResolution) +\n        Math.sqrt(deltaX * deltaX + deltaY * deltaY) / tileResolution;\n  }\n\n  /**\n   * @param {Event} browserEvent Browser event.\n   * @param {string=} opt_type Type.\n   */\n  handleBrowserEvent(browserEvent, opt_type) {\n    const type = opt_type || browserEvent.type;\n    const mapBrowserEvent = new MapBrowserEvent(type, this, browserEvent);\n    this.handleMapBrowserEvent(mapBrowserEvent);\n  }\n\n  /**\n   * @param {module:ol/MapBrowserEvent} mapBrowserEvent The event to handle.\n   */\n  handleMapBrowserEvent(mapBrowserEvent) {\n    if (!this.frameState_) {\n      // With no view defined, we cannot translate pixels into geographical\n      // coordinates so interactions cannot be used.\n      return;\n    }\n    this.focus_ = mapBrowserEvent.coordinate;\n    mapBrowserEvent.frameState = this.frameState_;\n    const interactionsArray = this.getInteractions().getArray();\n    if (this.dispatchEvent(mapBrowserEvent) !== false) {\n      for (let i = interactionsArray.length - 1; i >= 0; i--) {\n        const interaction = interactionsArray[i];\n        if (!interaction.getActive()) {\n          continue;\n        }\n        const cont = interaction.handleEvent(mapBrowserEvent);\n        if (!cont) {\n          break;\n        }\n      }\n    }\n  }\n\n  /**\n   * @protected\n   */\n  handlePostRender() {\n\n    const frameState = this.frameState_;\n\n    // Manage the tile queue\n    // Image loads are expensive and a limited resource, so try to use them\n    // efficiently:\n    // * When the view is static we allow a large number of parallel tile loads\n    //   to complete the frame as quickly as possible.\n    // * When animating or interacting, image loads can cause janks, so we reduce\n    //   the maximum number of loads per frame and limit the number of parallel\n    //   tile loads to remain reactive to view changes and to reduce the chance of\n    //   loading tiles that will quickly disappear from view.\n    const tileQueue = this.tileQueue_;\n    if (!tileQueue.isEmpty()) {\n      let maxTotalLoading = this.maxTilesLoading_;\n      let maxNewLoads = maxTotalLoading;\n      if (frameState) {\n        const hints = frameState.viewHints;\n        if (hints[ViewHint.ANIMATING]) {\n          maxTotalLoading = this.loadTilesWhileAnimating_ ? 8 : 0;\n          maxNewLoads = 2;\n        }\n        if (hints[ViewHint.INTERACTING]) {\n          maxTotalLoading = this.loadTilesWhileInteracting_ ? 8 : 0;\n          maxNewLoads = 2;\n        }\n      }\n      if (tileQueue.getTilesLoading() < maxTotalLoading) {\n        tileQueue.reprioritize(); // FIXME only call if view has changed\n        tileQueue.loadMoreTiles(maxTotalLoading, maxNewLoads);\n      }\n    }\n    if (frameState && this.hasListener(MapEventType.RENDERCOMPLETE) && !frameState.animate &&\n        !this.tileQueue_.getTilesLoading() && !getLoading(this.getLayers().getArray())) {\n      this.renderer_.dispatchRenderEvent(RenderEventType.RENDERCOMPLETE, frameState);\n    }\n\n    const postRenderFunctions = this.postRenderFunctions_;\n    for (let i = 0, ii = postRenderFunctions.length; i < ii; ++i) {\n      postRenderFunctions[i](this, frameState);\n    }\n    postRenderFunctions.length = 0;\n  }\n\n  /**\n   * @private\n   */\n  handleSizeChanged_() {\n    this.render();\n  }\n\n  /**\n   * @private\n   */\n  handleTargetChanged_() {\n    // target may be undefined, null, a string or an Element.\n    // If it's a string we convert it to an Element before proceeding.\n    // If it's not now an Element we remove the viewport from the DOM.\n    // If it's an Element we append the viewport element to it.\n\n    let targetElement;\n    if (this.getTarget()) {\n      targetElement = this.getTargetElement();\n    }\n\n    if (this.keyHandlerKeys_) {\n      for (let i = 0, ii = this.keyHandlerKeys_.length; i < ii; ++i) {\n        unlistenByKey(this.keyHandlerKeys_[i]);\n      }\n      this.keyHandlerKeys_ = null;\n    }\n\n    if (!targetElement) {\n      this.renderer_.removeLayerRenderers();\n      removeNode(this.viewport_);\n      if (this.handleResize_ !== undefined) {\n        removeEventListener(EventType.RESIZE, this.handleResize_, false);\n        this.handleResize_ = undefined;\n      }\n    } else {\n      targetElement.appendChild(this.viewport_);\n\n      const keyboardEventTarget = !this.keyboardEventTarget_ ?\n        targetElement : this.keyboardEventTarget_;\n      this.keyHandlerKeys_ = [\n        listen(keyboardEventTarget, EventType.KEYDOWN, this.handleBrowserEvent, this),\n        listen(keyboardEventTarget, EventType.KEYPRESS, this.handleBrowserEvent, this)\n      ];\n\n      if (!this.handleResize_) {\n        this.handleResize_ = this.updateSize.bind(this);\n        addEventListener(EventType.RESIZE, this.handleResize_, false);\n      }\n    }\n\n    this.updateSize();\n    // updateSize calls setSize, so no need to call this.render\n    // ourselves here.\n  }\n\n  /**\n   * @private\n   */\n  handleTileChange_() {\n    this.render();\n  }\n\n  /**\n   * @private\n   */\n  handleViewPropertyChanged_() {\n    this.render();\n  }\n\n  /**\n   * @private\n   */\n  handleViewChanged_() {\n    if (this.viewPropertyListenerKey_) {\n      unlistenByKey(this.viewPropertyListenerKey_);\n      this.viewPropertyListenerKey_ = null;\n    }\n    if (this.viewChangeListenerKey_) {\n      unlistenByKey(this.viewChangeListenerKey_);\n      this.viewChangeListenerKey_ = null;\n    }\n    const view = this.getView();\n    if (view) {\n      this.viewport_.setAttribute('data-view', getUid(view));\n      this.viewPropertyListenerKey_ = listen(\n        view, ObjectEventType.PROPERTYCHANGE,\n        this.handleViewPropertyChanged_, this);\n      this.viewChangeListenerKey_ = listen(\n        view, EventType.CHANGE,\n        this.handleViewPropertyChanged_, this);\n    }\n    this.render();\n  }\n\n  /**\n   * @private\n   */\n  handleLayerGroupChanged_() {\n    if (this.layerGroupPropertyListenerKeys_) {\n      this.layerGroupPropertyListenerKeys_.forEach(unlistenByKey);\n      this.layerGroupPropertyListenerKeys_ = null;\n    }\n    const layerGroup = this.getLayerGroup();\n    if (layerGroup) {\n      this.layerGroupPropertyListenerKeys_ = [\n        listen(\n          layerGroup, ObjectEventType.PROPERTYCHANGE,\n          this.render, this),\n        listen(\n          layerGroup, EventType.CHANGE,\n          this.render, this)\n      ];\n    }\n    this.render();\n  }\n\n  /**\n   * @return {boolean} Is rendered.\n   */\n  isRendered() {\n    return !!this.frameState_;\n  }\n\n  /**\n   * Requests an immediate render in a synchronous manner.\n   * @api\n   */\n  renderSync() {\n    if (this.animationDelayKey_) {\n      cancelAnimationFrame(this.animationDelayKey_);\n    }\n    this.animationDelay_();\n  }\n\n  /**\n   * Request a map rendering (at the next animation frame).\n   * @api\n   */\n  render() {\n    if (this.animationDelayKey_ === undefined) {\n      this.animationDelayKey_ = requestAnimationFrame(this.animationDelay_);\n    }\n  }\n\n  /**\n   * Remove the given control from the map.\n   * @param {module:ol/control/Control} control Control.\n   * @return {module:ol/control/Control|undefined} The removed control (or undefined\n   *     if the control was not found).\n   * @api\n   */\n  removeControl(control) {\n    return this.getControls().remove(control);\n  }\n\n  /**\n   * Remove the given interaction from the map.\n   * @param {module:ol/interaction/Interaction} interaction Interaction to remove.\n   * @return {module:ol/interaction/Interaction|undefined} The removed interaction (or\n   *     undefined if the interaction was not found).\n   * @api\n   */\n  removeInteraction(interaction) {\n    return this.getInteractions().remove(interaction);\n  }\n\n  /**\n   * Removes the given layer from the map.\n   * @param {module:ol/layer/Base} layer Layer.\n   * @return {module:ol/layer/Base|undefined} The removed layer (or undefined if the\n   *     layer was not found).\n   * @api\n   */\n  removeLayer(layer) {\n    const layers = this.getLayerGroup().getLayers();\n    return layers.remove(layer);\n  }\n\n  /**\n   * Remove the given overlay from the map.\n   * @param {module:ol/Overlay} overlay Overlay.\n   * @return {module:ol/Overlay|undefined} The removed overlay (or undefined\n   *     if the overlay was not found).\n   * @api\n   */\n  removeOverlay(overlay) {\n    return this.getOverlays().remove(overlay);\n  }\n\n  /**\n   * @param {number} time Time.\n   * @private\n   */\n  renderFrame_(time) {\n    let viewState;\n\n    const size = this.getSize();\n    const view = this.getView();\n    const extent = createEmpty();\n    const previousFrameState = this.frameState_;\n    /** @type {?module:ol/PluggableMap~FrameState} */\n    let frameState = null;\n    if (size !== undefined && hasArea(size) && view && view.isDef()) {\n      const viewHints = view.getHints(this.frameState_ ? this.frameState_.viewHints : undefined);\n      const layerStatesArray = this.getLayerGroup().getLayerStatesArray();\n      const layerStates = {};\n      for (let i = 0, ii = layerStatesArray.length; i < ii; ++i) {\n        layerStates[getUid(layerStatesArray[i].layer)] = layerStatesArray[i];\n      }\n      viewState = view.getState(this.pixelRatio_);\n      frameState = /** @type {module:ol/PluggableMap~FrameState} */ ({\n        animate: false,\n        coordinateToPixelTransform: this.coordinateToPixelTransform_,\n        extent: extent,\n        focus: this.focus_ ? this.focus_ : viewState.center,\n        index: this.frameIndex_++,\n        layerStates: layerStates,\n        layerStatesArray: layerStatesArray,\n        pixelRatio: this.pixelRatio_,\n        pixelToCoordinateTransform: this.pixelToCoordinateTransform_,\n        postRenderFunctions: [],\n        size: size,\n        skippedFeatureUids: this.skippedFeatureUids_,\n        tileQueue: this.tileQueue_,\n        time: time,\n        usedTiles: {},\n        viewState: viewState,\n        viewHints: viewHints,\n        wantedTiles: {}\n      });\n    }\n\n    if (frameState) {\n      frameState.extent = getForViewAndSize(viewState.center,\n        viewState.resolution, viewState.rotation, frameState.size, extent);\n    }\n\n    this.frameState_ = frameState;\n    this.renderer_.renderFrame(frameState);\n\n    if (frameState) {\n      if (frameState.animate) {\n        this.render();\n      }\n      Array.prototype.push.apply(this.postRenderFunctions_, frameState.postRenderFunctions);\n\n      if (previousFrameState) {\n        const moveStart = !this.previousExtent_ ||\n                    (!isEmpty(this.previousExtent_) &&\n                    !equals(frameState.extent, this.previousExtent_));\n        if (moveStart) {\n          this.dispatchEvent(\n            new MapEvent(MapEventType.MOVESTART, this, previousFrameState));\n          this.previousExtent_ = createOrUpdateEmpty(this.previousExtent_);\n        }\n      }\n\n      const idle = this.previousExtent_ &&\n          !frameState.viewHints[ViewHint.ANIMATING] &&\n          !frameState.viewHints[ViewHint.INTERACTING] &&\n          !equals(frameState.extent, this.previousExtent_);\n\n      if (idle) {\n        this.dispatchEvent(new MapEvent(MapEventType.MOVEEND, this, frameState));\n        clone(frameState.extent, this.previousExtent_);\n      }\n    }\n\n    this.dispatchEvent(new MapEvent(MapEventType.POSTRENDER, this, frameState));\n\n    setTimeout(this.handlePostRender.bind(this), 0);\n\n  }\n\n  /**\n   * Sets the layergroup of this map.\n   * @param {module:ol/layer/Group} layerGroup A layer group containing the layers in this map.\n   * @observable\n   * @api\n   */\n  setLayerGroup(layerGroup) {\n    this.set(MapProperty.LAYERGROUP, layerGroup);\n  }\n\n  /**\n   * Set the size of this map.\n   * @param {module:ol/size~Size|undefined} size The size in pixels of the map in the DOM.\n   * @observable\n   * @api\n   */\n  setSize(size) {\n    this.set(MapProperty.SIZE, size);\n  }\n\n  /**\n   * Set the target element to render this map into.\n   * @param {HTMLElement|string|undefined} target The Element or id of the Element\n   *     that the map is rendered in.\n   * @observable\n   * @api\n   */\n  setTarget(target) {\n    this.set(MapProperty.TARGET, target);\n  }\n\n  /**\n   * Set the view for this map.\n   * @param {module:ol/View} view The view that controls this map.\n   * @observable\n   * @api\n   */\n  setView(view) {\n    this.set(MapProperty.VIEW, view);\n  }\n\n  /**\n   * @param {module:ol/Feature} feature Feature.\n   */\n  skipFeature(feature) {\n    const featureUid = getUid(feature).toString();\n    this.skippedFeatureUids_[featureUid] = true;\n    this.render();\n  }\n\n  /**\n   * Force a recalculation of the map viewport size.  This should be called when\n   * third-party code changes the size of the map viewport.\n   * @api\n   */\n  updateSize() {\n    const targetElement = this.getTargetElement();\n\n    if (!targetElement) {\n      this.setSize(undefined);\n    } else {\n      const computedStyle = getComputedStyle(targetElement);\n      this.setSize([\n        targetElement.offsetWidth -\n            parseFloat(computedStyle['borderLeftWidth']) -\n            parseFloat(computedStyle['paddingLeft']) -\n            parseFloat(computedStyle['paddingRight']) -\n            parseFloat(computedStyle['borderRightWidth']),\n        targetElement.offsetHeight -\n            parseFloat(computedStyle['borderTopWidth']) -\n            parseFloat(computedStyle['paddingTop']) -\n            parseFloat(computedStyle['paddingBottom']) -\n            parseFloat(computedStyle['borderBottomWidth'])\n      ]);\n    }\n  }\n\n  /**\n   * @param {module:ol/Feature} feature Feature.\n   */\n  unskipFeature(feature) {\n    const featureUid = getUid(feature).toString();\n    delete this.skippedFeatureUids_[featureUid];\n    this.render();\n  }\n}\n\n\n/**\n * @param {MapOptions} options Map options.\n * @return {module:ol/PluggableMap~MapOptionsInternal} Internal map options.\n */\nfunction createOptionsInternal(options) {\n\n  /**\n   * @type {HTMLElement|Document}\n   */\n  let keyboardEventTarget = null;\n  if (options.keyboardEventTarget !== undefined) {\n    keyboardEventTarget = typeof options.keyboardEventTarget === 'string' ?\n      document.getElementById(options.keyboardEventTarget) :\n      options.keyboardEventTarget;\n  }\n\n  /**\n   * @type {Object<string, *>}\n   */\n  const values = {};\n\n  const layerGroup = (options.layers instanceof LayerGroup) ?\n    options.layers : new LayerGroup({layers: options.layers});\n  values[MapProperty.LAYERGROUP] = layerGroup;\n\n  values[MapProperty.TARGET] = options.target;\n\n  values[MapProperty.VIEW] = options.view !== undefined ?\n    options.view : new View();\n\n  let controls;\n  if (options.controls !== undefined) {\n    if (Array.isArray(options.controls)) {\n      controls = new Collection(options.controls.slice());\n    } else {\n      assert(options.controls instanceof Collection,\n        47); // Expected `controls` to be an array or an `module:ol/Collection~Collection`\n      controls = options.controls;\n    }\n  }\n\n  let interactions;\n  if (options.interactions !== undefined) {\n    if (Array.isArray(options.interactions)) {\n      interactions = new Collection(options.interactions.slice());\n    } else {\n      assert(options.interactions instanceof Collection,\n        48); // Expected `interactions` to be an array or an `module:ol/Collection~Collection`\n      interactions = options.interactions;\n    }\n  }\n\n  let overlays;\n  if (options.overlays !== undefined) {\n    if (Array.isArray(options.overlays)) {\n      overlays = new Collection(options.overlays.slice());\n    } else {\n      assert(options.overlays instanceof Collection,\n        49); // Expected `overlays` to be an array or an `module:ol/Collection~Collection`\n      overlays = options.overlays;\n    }\n  } else {\n    overlays = new Collection();\n  }\n\n  return {\n    controls: controls,\n    interactions: interactions,\n    keyboardEventTarget: keyboardEventTarget,\n    overlays: overlays,\n    values: values\n  };\n\n}\nexport default PluggableMap;\n\n/**\n * @param  {Array<module:ol/layer/Base>} layers Layers.\n * @return {boolean} Layers have sources that are still loading.\n */\nfunction getLoading(layers) {\n  for (let i = 0, ii = layers.length; i < ii; ++i) {\n    const layer = layers[i];\n    if (layer instanceof LayerGroup) {\n      return getLoading(layer.getLayers().getArray());\n    }\n    const source = layers[i].getSource();\n    if (source && source.loading) {\n      return true;\n    }\n  }\n  return false;\n}\n","/**\n * @module ol/control/Control\n */\nimport {VOID} from '../functions.js';\nimport MapEventType from '../MapEventType.js';\nimport BaseObject from '../Object.js';\nimport {removeNode} from '../dom.js';\nimport {listen, unlistenByKey} from '../events.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {HTMLElement} [element] The element is the control's\n * container element. This only needs to be specified if you're developing\n * a custom control.\n * @property {function(module:ol/MapEvent)} [render] Function called when\n * the control should be re-rendered. This is called in a `requestAnimationFrame`\n * callback.\n * @property {HTMLElement|string} [target] Specify a target if you want\n * the control to be rendered outside of the map's viewport.\n */\n\n\n/**\n * @classdesc\n * A control is a visible widget with a DOM element in a fixed position on the\n * screen. They can involve user input (buttons), or be informational only;\n * the position is determined using CSS. By default these are placed in the\n * container with CSS class name `ol-overlaycontainer-stopevent`, but can use\n * any outside DOM element.\n *\n * This is the base class for controls. You can use it for simple custom\n * controls by creating the element with listeners, creating an instance:\n * ```js\n * var myControl = new Control({element: myElement});\n * ```\n * and then adding this to the map.\n *\n * The main advantage of having this as a control rather than a simple separate\n * DOM element is that preventing propagation is handled for you. Controls\n * will also be objects in a {@link module:ol/Collection~Collection}, so you can use their methods.\n *\n * You can also extend this base for your own control class. See\n * examples/custom-controls for an example of how to do this.\n *\n * @api\n */\nclass Control extends BaseObject {\n\n  /**\n   * @param {module:ol/control/Control~Options} options Control options.\n   */\n  constructor(options) {\n\n    super();\n\n    /**\n     * @protected\n     * @type {HTMLElement}\n     */\n    this.element = options.element ? options.element : null;\n\n    /**\n     * @private\n     * @type {HTMLElement}\n     */\n    this.target_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/PluggableMap}\n     */\n    this.map_ = null;\n\n    /**\n     * @protected\n     * @type {!Array<module:ol/events~EventsKey>}\n     */\n    this.listenerKeys = [];\n\n    /**\n     * @type {function(module:ol/MapEvent)}\n     */\n    this.render = options.render ? options.render : VOID;\n\n    if (options.target) {\n      this.setTarget(options.target);\n    }\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    removeNode(this.element);\n    super.disposeInternal();\n  }\n\n  /**\n   * Get the map associated with this control.\n   * @return {module:ol/PluggableMap} Map.\n   * @api\n   */\n  getMap() {\n    return this.map_;\n  }\n\n  /**\n   * Remove the control from its current map and attach it to the new map.\n   * Subclasses may set up event handlers to get notified about changes to\n   * the map here.\n   * @param {module:ol/PluggableMap} map Map.\n   * @api\n   */\n  setMap(map) {\n    if (this.map_) {\n      removeNode(this.element);\n    }\n    for (let i = 0, ii = this.listenerKeys.length; i < ii; ++i) {\n      unlistenByKey(this.listenerKeys[i]);\n    }\n    this.listenerKeys.length = 0;\n    this.map_ = map;\n    if (this.map_) {\n      const target = this.target_ ?\n        this.target_ : map.getOverlayContainerStopEvent();\n      target.appendChild(this.element);\n      if (this.render !== VOID) {\n        this.listenerKeys.push(listen(map,\n          MapEventType.POSTRENDER, this.render, this));\n      }\n      map.render();\n    }\n  }\n\n  /**\n   * This function is used to set a target element for the control. It has no\n   * effect if it is called after the control has been added to the map (i.e.\n   * after `setMap` is called on the control). If no `target` is set in the\n   * options passed to the control constructor and if `setTarget` is not called\n   * then the control is added to the map's overlay container.\n   * @param {HTMLElement|string} target Target.\n   * @api\n   */\n  setTarget(target) {\n    this.target_ = typeof target === 'string' ?\n      document.getElementById(target) :\n      target;\n  }\n}\n\n\nexport default Control;\n","/**\n * @module ol/control/Attribution\n */\nimport {equals} from '../array.js';\nimport Control from '../control/Control.js';\nimport {CLASS_CONTROL, CLASS_UNSELECTABLE, CLASS_COLLAPSED} from '../css.js';\nimport {removeChildren, replaceNode} from '../dom.js';\nimport {listen} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {visibleAtResolution} from '../layer/Layer.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {string} [className='ol-attribution'] CSS class name.\n * @property {HTMLElement|string} [target] Specify a target if you\n * want the control to be rendered outside of the map's\n * viewport.\n * @property {boolean} [collapsible=true] Specify if attributions can\n * be collapsed. If you use an OSM source, should be set to `false` — see\n * {@link https://www.openstreetmap.org/copyright OSM Copyright} —\n * @property {boolean} [collapsed=true] Specify if attributions should\n * be collapsed at startup.\n * @property {string} [tipLabel='Attributions'] Text label to use for the button tip.\n * @property {string} [label='i'] Text label to use for the\n * collapsed attributions button.\n * Instead of text, also an element (e.g. a `span` element) can be used.\n * @property {string|HTMLElement} [collapseLabel='»'] Text label to use\n * for the expanded attributions button.\n * Instead of text, also an element (e.g. a `span` element) can be used.\n * @property {function(module:ol/MapEvent)} [render] Function called when\n * the control should be re-rendered. This is called in a `requestAnimationFrame`\n * callback.\n */\n\n\n/**\n * @classdesc\n * Control to show all the attributions associated with the layer sources\n * in the map. This control is one of the default controls included in maps.\n * By default it will show in the bottom right portion of the map, but this can\n * be changed by using a css selector for `.ol-attribution`.\n *\n * @api\n */\nclass Attribution extends Control {\n\n  /**\n   * @param {module:ol/control/Attribution~Options=} opt_options Attribution options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super({\n      element: document.createElement('div'),\n      render: options.render || render,\n      target: options.target\n    });\n\n    /**\n     * @private\n     * @type {HTMLElement}\n     */\n    this.ulElement_ = document.createElement('ul');\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.collapsed_ = options.collapsed !== undefined ? options.collapsed : true;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.collapsible_ = options.collapsible !== undefined ?\n      options.collapsible : true;\n\n    if (!this.collapsible_) {\n      this.collapsed_ = false;\n    }\n\n    const className = options.className !== undefined ? options.className : 'ol-attribution';\n\n    const tipLabel = options.tipLabel !== undefined ? options.tipLabel : 'Attributions';\n\n    const collapseLabel = options.collapseLabel !== undefined ? options.collapseLabel : '\\u00BB';\n\n    if (typeof collapseLabel === 'string') {\n      /**\n       * @private\n       * @type {HTMLElement}\n       */\n      this.collapseLabel_ = document.createElement('span');\n      this.collapseLabel_.textContent = collapseLabel;\n    } else {\n      this.collapseLabel_ = collapseLabel;\n    }\n\n    const label = options.label !== undefined ? options.label : 'i';\n\n    if (typeof label === 'string') {\n      /**\n       * @private\n       * @type {HTMLElement}\n       */\n      this.label_ = document.createElement('span');\n      this.label_.textContent = label;\n    } else {\n      this.label_ = label;\n    }\n\n\n    const activeLabel = (this.collapsible_ && !this.collapsed_) ?\n      this.collapseLabel_ : this.label_;\n    const button = document.createElement('button');\n    button.setAttribute('type', 'button');\n    button.title = tipLabel;\n    button.appendChild(activeLabel);\n\n    listen(button, EventType.CLICK, this.handleClick_, this);\n\n    const cssClasses = className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL +\n        (this.collapsed_ && this.collapsible_ ? ' ' + CLASS_COLLAPSED : '') +\n        (this.collapsible_ ? '' : ' ol-uncollapsible');\n    const element = this.element;\n    element.className = cssClasses;\n    element.appendChild(this.ulElement_);\n    element.appendChild(button);\n\n    /**\n     * A list of currently rendered resolutions.\n     * @type {Array<string>}\n     * @private\n     */\n    this.renderedAttributions_ = [];\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.renderedVisible_ = true;\n\n  }\n\n  /**\n   * Get a list of visible attributions.\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @return {Array<string>} Attributions.\n   * @private\n   */\n  getSourceAttributions_(frameState) {\n    /**\n     * Used to determine if an attribution already exists.\n     * @type {!Object<string, boolean>}\n     */\n    const lookup = {};\n\n    /**\n     * A list of visible attributions.\n     * @type {Array<string>}\n     */\n    const visibleAttributions = [];\n\n    const layerStatesArray = frameState.layerStatesArray;\n    const resolution = frameState.viewState.resolution;\n    for (let i = 0, ii = layerStatesArray.length; i < ii; ++i) {\n      const layerState = layerStatesArray[i];\n      if (!visibleAtResolution(layerState, resolution)) {\n        continue;\n      }\n\n      const source = layerState.layer.getSource();\n      if (!source) {\n        continue;\n      }\n\n      const attributionGetter = source.getAttributions();\n      if (!attributionGetter) {\n        continue;\n      }\n\n      const attributions = attributionGetter(frameState);\n      if (!attributions) {\n        continue;\n      }\n\n      if (Array.isArray(attributions)) {\n        for (let j = 0, jj = attributions.length; j < jj; ++j) {\n          if (!(attributions[j] in lookup)) {\n            visibleAttributions.push(attributions[j]);\n            lookup[attributions[j]] = true;\n          }\n        }\n      } else {\n        if (!(attributions in lookup)) {\n          visibleAttributions.push(attributions);\n          lookup[attributions] = true;\n        }\n      }\n    }\n    return visibleAttributions;\n  }\n\n  /**\n   * @private\n   * @param {?module:ol/PluggableMap~FrameState} frameState Frame state.\n   */\n  updateElement_(frameState) {\n    if (!frameState) {\n      if (this.renderedVisible_) {\n        this.element.style.display = 'none';\n        this.renderedVisible_ = false;\n      }\n      return;\n    }\n\n    const attributions = this.getSourceAttributions_(frameState);\n\n    const visible = attributions.length > 0;\n    if (this.renderedVisible_ != visible) {\n      this.element.style.display = visible ? '' : 'none';\n      this.renderedVisible_ = visible;\n    }\n\n    if (equals(attributions, this.renderedAttributions_)) {\n      return;\n    }\n\n    removeChildren(this.ulElement_);\n\n    // append the attributions\n    for (let i = 0, ii = attributions.length; i < ii; ++i) {\n      const element = document.createElement('li');\n      element.innerHTML = attributions[i];\n      this.ulElement_.appendChild(element);\n    }\n\n    this.renderedAttributions_ = attributions;\n  }\n\n  /**\n   * @param {MouseEvent} event The event to handle\n   * @private\n   */\n  handleClick_(event) {\n    event.preventDefault();\n    this.handleToggle_();\n  }\n\n  /**\n   * @private\n   */\n  handleToggle_() {\n    this.element.classList.toggle(CLASS_COLLAPSED);\n    if (this.collapsed_) {\n      replaceNode(this.collapseLabel_, this.label_);\n    } else {\n      replaceNode(this.label_, this.collapseLabel_);\n    }\n    this.collapsed_ = !this.collapsed_;\n  }\n\n  /**\n   * Return `true` if the attribution is collapsible, `false` otherwise.\n   * @return {boolean} True if the widget is collapsible.\n   * @api\n   */\n  getCollapsible() {\n    return this.collapsible_;\n  }\n\n  /**\n   * Set whether the attribution should be collapsible.\n   * @param {boolean} collapsible True if the widget is collapsible.\n   * @api\n   */\n  setCollapsible(collapsible) {\n    if (this.collapsible_ === collapsible) {\n      return;\n    }\n    this.collapsible_ = collapsible;\n    this.element.classList.toggle('ol-uncollapsible');\n    if (!collapsible && this.collapsed_) {\n      this.handleToggle_();\n    }\n  }\n\n  /**\n   * Collapse or expand the attribution according to the passed parameter. Will\n   * not do anything if the attribution isn't collapsible or if the current\n   * collapsed state is already the one requested.\n   * @param {boolean} collapsed True if the widget is collapsed.\n   * @api\n   */\n  setCollapsed(collapsed) {\n    if (!this.collapsible_ || this.collapsed_ === collapsed) {\n      return;\n    }\n    this.handleToggle_();\n  }\n\n  /**\n   * Return `true` when the attribution is currently collapsed or `false`\n   * otherwise.\n   * @return {boolean} True if the widget is collapsed.\n   * @api\n   */\n  getCollapsed() {\n    return this.collapsed_;\n  }\n}\n\n\n/**\n * Update the attribution element.\n * @param {module:ol/MapEvent} mapEvent Map event.\n * @this {module:ol/control/Attribution}\n * @api\n */\nexport function render(mapEvent) {\n  this.updateElement_(mapEvent.frameState);\n}\n\n\nexport default Attribution;\n","/**\n * @module ol/control/Rotate\n */\nimport Control from '../control/Control.js';\nimport {CLASS_CONTROL, CLASS_HIDDEN, CLASS_UNSELECTABLE} from '../css.js';\nimport {easeOut} from '../easing.js';\nimport {listen} from '../events.js';\nimport EventType from '../events/EventType.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {string} [className='ol-rotate'] CSS class name.\n * @property {string|HTMLElement} [label='⇧'] Text label to use for the rotate button.\n * Instead of text, also an element (e.g. a `span` element) can be used.\n * @property {string} [tipLabel='Reset rotation'] Text label to use for the rotate tip.\n * @property {number} [duration=250] Animation duration in milliseconds.\n * @property {boolean} [autoHide=true] Hide the control when rotation is 0.\n * @property {function(module:ol/MapEvent)} [render] Function called when the control should\n * be re-rendered. This is called in a `requestAnimationFrame` callback.\n * @property {function()} [resetNorth] Function called when the control is clicked.\n * This will override the default `resetNorth`.\n * @property {HTMLElement|string} [target] Specify a target if you want the control to be\n * rendered outside of the map's viewport.\n */\n\n\n/**\n * @classdesc\n * A button control to reset rotation to 0.\n * To style this control use css selector `.ol-rotate`. A `.ol-hidden` css\n * selector is added to the button when the rotation is 0.\n *\n * @api\n */\nclass Rotate extends Control {\n\n  /**\n   * @param {module:ol/control/Rotate~Options=} opt_options Rotate options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super({\n      element: document.createElement('div'),\n      render: options.render || render,\n      target: options.target\n    });\n\n    const className = options.className !== undefined ? options.className : 'ol-rotate';\n\n    const label = options.label !== undefined ? options.label : '\\u21E7';\n\n    /**\n     * @type {HTMLElement}\n     * @private\n     */\n    this.label_ = null;\n\n    if (typeof label === 'string') {\n      this.label_ = document.createElement('span');\n      this.label_.className = 'ol-compass';\n      this.label_.textContent = label;\n    } else {\n      this.label_ = label;\n      this.label_.classList.add('ol-compass');\n    }\n\n    const tipLabel = options.tipLabel ? options.tipLabel : 'Reset rotation';\n\n    const button = document.createElement('button');\n    button.className = className + '-reset';\n    button.setAttribute('type', 'button');\n    button.title = tipLabel;\n    button.appendChild(this.label_);\n\n    listen(button, EventType.CLICK, this.handleClick_, this);\n\n    const cssClasses = className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL;\n    const element = this.element;\n    element.className = cssClasses;\n    element.appendChild(button);\n\n    this.callResetNorth_ = options.resetNorth ? options.resetNorth : undefined;\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 250;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.autoHide_ = options.autoHide !== undefined ? options.autoHide : true;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.rotation_ = undefined;\n\n    if (this.autoHide_) {\n      this.element.classList.add(CLASS_HIDDEN);\n    }\n\n  }\n\n  /**\n   * @param {MouseEvent} event The event to handle\n   * @private\n   */\n  handleClick_(event) {\n    event.preventDefault();\n    if (this.callResetNorth_ !== undefined) {\n      this.callResetNorth_();\n    } else {\n      this.resetNorth_();\n    }\n  }\n\n  /**\n   * @private\n   */\n  resetNorth_() {\n    const map = this.getMap();\n    const view = map.getView();\n    if (!view) {\n      // the map does not have a view, so we can't act\n      // upon it\n      return;\n    }\n    if (view.getRotation() !== undefined) {\n      if (this.duration_ > 0) {\n        view.animate({\n          rotation: 0,\n          duration: this.duration_,\n          easing: easeOut\n        });\n      } else {\n        view.setRotation(0);\n      }\n    }\n  }\n}\n\n\n/**\n * Update the rotate control element.\n * @param {module:ol/MapEvent} mapEvent Map event.\n * @this {module:ol/control/Rotate}\n * @api\n */\nexport function render(mapEvent) {\n  const frameState = mapEvent.frameState;\n  if (!frameState) {\n    return;\n  }\n  const rotation = frameState.viewState.rotation;\n  if (rotation != this.rotation_) {\n    const transform = 'rotate(' + rotation + 'rad)';\n    if (this.autoHide_) {\n      const contains = this.element.classList.contains(CLASS_HIDDEN);\n      if (!contains && rotation === 0) {\n        this.element.classList.add(CLASS_HIDDEN);\n      } else if (contains && rotation !== 0) {\n        this.element.classList.remove(CLASS_HIDDEN);\n      }\n    }\n    this.label_.style.msTransform = transform;\n    this.label_.style.webkitTransform = transform;\n    this.label_.style.transform = transform;\n  }\n  this.rotation_ = rotation;\n}\n\nexport default Rotate;\n","/**\n * @module ol/control/Zoom\n */\nimport {listen} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport Control from '../control/Control.js';\nimport {CLASS_CONTROL, CLASS_UNSELECTABLE} from '../css.js';\nimport {easeOut} from '../easing.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [duration=250] Animation duration in milliseconds.\n * @property {string} [className='ol-zoom'] CSS class name.\n * @property {string|HTMLElement} [zoomInLabel='+'] Text label to use for the zoom-in\n * button. Instead of text, also an element (e.g. a `span` element) can be used.\n * @property {string|HTMLElement} [zoomOutLabel='-'] Text label to use for the zoom-out button.\n * Instead of text, also an element (e.g. a `span` element) can be used.\n * @property {string} [zoomInTipLabel='Zoom in'] Text label to use for the button tip.\n * @property {string} [zoomOutTipLabel='Zoom out'] Text label to use for the button tip.\n * @property {number} [delta=1] The zoom delta applied on each click.\n * @property {HTMLElement|string} [target] Specify a target if you want the control to be\n * rendered outside of the map's viewport.\n */\n\n\n/**\n * @classdesc\n * A control with 2 buttons, one for zoom in and one for zoom out.\n * This control is one of the default controls of a map. To style this control\n * use css selectors `.ol-zoom-in` and `.ol-zoom-out`.\n *\n * @api\n */\nclass Zoom extends Control {\n\n  /**\n   * @param {module:ol/control/Zoom~Options=} opt_options Zoom options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super({\n      element: document.createElement('div'),\n      target: options.target\n    });\n\n    const className = options.className !== undefined ? options.className : 'ol-zoom';\n\n    const delta = options.delta !== undefined ? options.delta : 1;\n\n    const zoomInLabel = options.zoomInLabel !== undefined ? options.zoomInLabel : '+';\n    const zoomOutLabel = options.zoomOutLabel !== undefined ? options.zoomOutLabel : '\\u2212';\n\n    const zoomInTipLabel = options.zoomInTipLabel !== undefined ?\n      options.zoomInTipLabel : 'Zoom in';\n    const zoomOutTipLabel = options.zoomOutTipLabel !== undefined ?\n      options.zoomOutTipLabel : 'Zoom out';\n\n    const inElement = document.createElement('button');\n    inElement.className = className + '-in';\n    inElement.setAttribute('type', 'button');\n    inElement.title = zoomInTipLabel;\n    inElement.appendChild(\n      typeof zoomInLabel === 'string' ? document.createTextNode(zoomInLabel) : zoomInLabel\n    );\n\n    listen(inElement, EventType.CLICK, this.handleClick_.bind(this, delta));\n\n    const outElement = document.createElement('button');\n    outElement.className = className + '-out';\n    outElement.setAttribute('type', 'button');\n    outElement.title = zoomOutTipLabel;\n    outElement.appendChild(\n      typeof zoomOutLabel === 'string' ? document.createTextNode(zoomOutLabel) : zoomOutLabel\n    );\n\n    listen(outElement, EventType.CLICK, this.handleClick_.bind(this, -delta));\n\n    const cssClasses = className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL;\n    const element = this.element;\n    element.className = cssClasses;\n    element.appendChild(inElement);\n    element.appendChild(outElement);\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 250;\n\n  }\n\n  /**\n   * @param {number} delta Zoom delta.\n   * @param {MouseEvent} event The event to handle\n   * @private\n   */\n  handleClick_(delta, event) {\n    event.preventDefault();\n    this.zoomByDelta_(delta);\n  }\n\n  /**\n   * @param {number} delta Zoom delta.\n   * @private\n   */\n  zoomByDelta_(delta) {\n    const map = this.getMap();\n    const view = map.getView();\n    if (!view) {\n      // the map does not have a view, so we can't act\n      // upon it\n      return;\n    }\n    const currentResolution = view.getResolution();\n    if (currentResolution) {\n      const newResolution = view.constrainResolution(currentResolution, delta);\n      if (this.duration_ > 0) {\n        if (view.getAnimating()) {\n          view.cancelAnimations();\n        }\n        view.animate({\n          resolution: newResolution,\n          duration: this.duration_,\n          easing: easeOut\n        });\n      } else {\n        view.setResolution(newResolution);\n      }\n    }\n  }\n}\n\n\nexport default Zoom;\n","/**\n * @module ol/Kinetic\n */\n\n/**\n * @classdesc\n * Implementation of inertial deceleration for map movement.\n *\n * @api\n */\nclass Kinetic {\n\n  /**\n   * @param {number} decay Rate of decay (must be negative).\n   * @param {number} minVelocity Minimum velocity (pixels/millisecond).\n   * @param {number} delay Delay to consider to calculate the kinetic\n   *     initial values (milliseconds).\n   */\n  constructor(decay, minVelocity, delay) {\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.decay_ = decay;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.minVelocity_ = minVelocity;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.delay_ = delay;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.points_ = [];\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.angle_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.initialVelocity_ = 0;\n  }\n\n  /**\n   * FIXME empty description for jsdoc\n   */\n  begin() {\n    this.points_.length = 0;\n    this.angle_ = 0;\n    this.initialVelocity_ = 0;\n  }\n\n  /**\n   * @param {number} x X.\n   * @param {number} y Y.\n   */\n  update(x, y) {\n    this.points_.push(x, y, Date.now());\n  }\n\n  /**\n   * @return {boolean} Whether we should do kinetic animation.\n   */\n  end() {\n    if (this.points_.length < 6) {\n      // at least 2 points are required (i.e. there must be at least 6 elements\n      // in the array)\n      return false;\n    }\n    const delay = Date.now() - this.delay_;\n    const lastIndex = this.points_.length - 3;\n    if (this.points_[lastIndex + 2] < delay) {\n      // the last tracked point is too old, which means that the user stopped\n      // panning before releasing the map\n      return false;\n    }\n\n    // get the first point which still falls into the delay time\n    let firstIndex = lastIndex - 3;\n    while (firstIndex > 0 && this.points_[firstIndex + 2] > delay) {\n      firstIndex -= 3;\n    }\n\n    const duration = this.points_[lastIndex + 2] - this.points_[firstIndex + 2];\n    // we don't want a duration of 0 (divide by zero)\n    // we also make sure the user panned for a duration of at least one frame\n    // (1/60s) to compute sane displacement values\n    if (duration < 1000 / 60) {\n      return false;\n    }\n\n    const dx = this.points_[lastIndex] - this.points_[firstIndex];\n    const dy = this.points_[lastIndex + 1] - this.points_[firstIndex + 1];\n    this.angle_ = Math.atan2(dy, dx);\n    this.initialVelocity_ = Math.sqrt(dx * dx + dy * dy) / duration;\n    return this.initialVelocity_ > this.minVelocity_;\n  }\n\n  /**\n   * @return {number} Total distance travelled (pixels).\n   */\n  getDistance() {\n    return (this.minVelocity_ - this.initialVelocity_) / this.decay_;\n  }\n\n  /**\n   * @return {number} Angle of the kinetic panning animation (radians).\n   */\n  getAngle() {\n    return this.angle_;\n  }\n}\n\nexport default Kinetic;\n","/**\n * @module ol/interaction/Property\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  ACTIVE: 'active'\n};\n","/**\n * @module ol/interaction/Interaction\n */\nimport BaseObject from '../Object.js';\nimport {easeOut, linear} from '../easing.js';\nimport InteractionProperty from '../interaction/Property.js';\nimport {clamp} from '../math.js';\n\n\n/**\n * Object literal with config options for interactions.\n * @typedef {Object} InteractionOptions\n * @property {function(module:ol/MapBrowserEvent):boolean} handleEvent\n * Method called by the map to notify the interaction that a browser event was\n * dispatched to the map. If the function returns a falsy value, propagation of\n * the event to other interactions in the map's interactions chain will be\n * prevented (this includes functions with no explicit return).\n */\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * User actions that change the state of the map. Some are similar to controls,\n * but are not associated with a DOM element.\n * For example, {@link module:ol/interaction/KeyboardZoom~KeyboardZoom} is\n * functionally the same as {@link module:ol/control/Zoom~Zoom}, but triggered\n * by a keyboard event not a button element event.\n * Although interactions do not have a DOM element, some of them do render\n * vectors and so are visible on the screen.\n * @api\n */\nclass Interaction extends BaseObject {\n  /**\n   * @param {module:ol/interaction/Interaction~InteractionOptions} options Options.\n   */\n  constructor(options) {\n    super();\n\n    /**\n     * @private\n     * @type {module:ol/PluggableMap}\n     */\n    this.map_ = null;\n\n    this.setActive(true);\n\n    /**\n     * @type {function(module:ol/MapBrowserEvent):boolean}\n     */\n    this.handleEvent = options.handleEvent;\n\n  }\n\n  /**\n   * Return whether the interaction is currently active.\n   * @return {boolean} `true` if the interaction is active, `false` otherwise.\n   * @observable\n   * @api\n   */\n  getActive() {\n    return /** @type {boolean} */ (this.get(InteractionProperty.ACTIVE));\n  }\n\n  /**\n   * Get the map associated with this interaction.\n   * @return {module:ol/PluggableMap} Map.\n   * @api\n   */\n  getMap() {\n    return this.map_;\n  }\n\n  /**\n   * Activate or deactivate the interaction.\n   * @param {boolean} active Active.\n   * @observable\n   * @api\n   */\n  setActive(active) {\n    this.set(InteractionProperty.ACTIVE, active);\n  }\n\n  /**\n   * Remove the interaction from its current map and attach it to the new map.\n   * Subclasses may set up event handlers to get notified about changes to\n   * the map here.\n   * @param {module:ol/PluggableMap} map Map.\n   */\n  setMap(map) {\n    this.map_ = map;\n  }\n}\n\n\n/**\n * @param {module:ol/View} view View.\n * @param {module:ol/coordinate~Coordinate} delta Delta.\n * @param {number=} opt_duration Duration.\n */\nexport function pan(view, delta, opt_duration) {\n  const currentCenter = view.getCenter();\n  if (currentCenter) {\n    const center = view.constrainCenter(\n      [currentCenter[0] + delta[0], currentCenter[1] + delta[1]]);\n    if (opt_duration) {\n      view.animate({\n        duration: opt_duration,\n        easing: linear,\n        center: center\n      });\n    } else {\n      view.setCenter(center);\n    }\n  }\n}\n\n\n/**\n * @param {module:ol/View} view View.\n * @param {number|undefined} rotation Rotation.\n * @param {module:ol/coordinate~Coordinate=} opt_anchor Anchor coordinate.\n * @param {number=} opt_duration Duration.\n */\nexport function rotate(view, rotation, opt_anchor, opt_duration) {\n  rotation = view.constrainRotation(rotation, 0);\n  rotateWithoutConstraints(view, rotation, opt_anchor, opt_duration);\n}\n\n\n/**\n * @param {module:ol/View} view View.\n * @param {number|undefined} rotation Rotation.\n * @param {module:ol/coordinate~Coordinate=} opt_anchor Anchor coordinate.\n * @param {number=} opt_duration Duration.\n */\nexport function rotateWithoutConstraints(view, rotation, opt_anchor, opt_duration) {\n  if (rotation !== undefined) {\n    const currentRotation = view.getRotation();\n    const currentCenter = view.getCenter();\n    if (currentRotation !== undefined && currentCenter && opt_duration > 0) {\n      view.animate({\n        rotation: rotation,\n        anchor: opt_anchor,\n        duration: opt_duration,\n        easing: easeOut\n      });\n    } else {\n      view.rotate(rotation, opt_anchor);\n    }\n  }\n}\n\n\n/**\n * @param {module:ol/View} view View.\n * @param {number|undefined} resolution Resolution to go to.\n * @param {module:ol/coordinate~Coordinate=} opt_anchor Anchor coordinate.\n * @param {number=} opt_duration Duration.\n * @param {number=} opt_direction Zooming direction; > 0 indicates\n *     zooming out, in which case the constraints system will select\n *     the largest nearest resolution; < 0 indicates zooming in, in\n *     which case the constraints system will select the smallest\n *     nearest resolution; == 0 indicates that the zooming direction\n *     is unknown/not relevant, in which case the constraints system\n *     will select the nearest resolution. If not defined 0 is\n *     assumed.\n */\nexport function zoom(view, resolution, opt_anchor, opt_duration, opt_direction) {\n  resolution = view.constrainResolution(resolution, 0, opt_direction);\n  zoomWithoutConstraints(view, resolution, opt_anchor, opt_duration);\n}\n\n\n/**\n * @param {module:ol/View} view View.\n * @param {number} delta Delta from previous zoom level.\n * @param {module:ol/coordinate~Coordinate=} opt_anchor Anchor coordinate.\n * @param {number=} opt_duration Duration.\n */\nexport function zoomByDelta(view, delta, opt_anchor, opt_duration) {\n  const currentResolution = view.getResolution();\n  let resolution = view.constrainResolution(currentResolution, delta, 0);\n\n  if (resolution !== undefined) {\n    const resolutions = view.getResolutions();\n    resolution = clamp(\n      resolution,\n      view.getMinResolution() || resolutions[resolutions.length - 1],\n      view.getMaxResolution() || resolutions[0]);\n  }\n\n  // If we have a constraint on center, we need to change the anchor so that the\n  // new center is within the extent. We first calculate the new center, apply\n  // the constraint to it, and then calculate back the anchor\n  if (opt_anchor && resolution !== undefined && resolution !== currentResolution) {\n    const currentCenter = view.getCenter();\n    let center = view.calculateCenterZoom(resolution, opt_anchor);\n    center = view.constrainCenter(center);\n\n    opt_anchor = [\n      (resolution * currentCenter[0] - currentResolution * center[0]) /\n          (resolution - currentResolution),\n      (resolution * currentCenter[1] - currentResolution * center[1]) /\n          (resolution - currentResolution)\n    ];\n  }\n\n  zoomWithoutConstraints(view, resolution, opt_anchor, opt_duration);\n}\n\n\n/**\n * @param {module:ol/View} view View.\n * @param {number|undefined} resolution Resolution to go to.\n * @param {module:ol/coordinate~Coordinate=} opt_anchor Anchor coordinate.\n * @param {number=} opt_duration Duration.\n */\nexport function zoomWithoutConstraints(view, resolution, opt_anchor, opt_duration) {\n  if (resolution) {\n    const currentResolution = view.getResolution();\n    const currentCenter = view.getCenter();\n    if (currentResolution !== undefined && currentCenter &&\n        resolution !== currentResolution && opt_duration) {\n      view.animate({\n        resolution: resolution,\n        anchor: opt_anchor,\n        duration: opt_duration,\n        easing: easeOut\n      });\n    } else {\n      if (opt_anchor) {\n        const center = view.calculateCenterZoom(resolution, opt_anchor);\n        view.setCenter(center);\n      }\n      view.setResolution(resolution);\n    }\n  }\n}\n\nexport default Interaction;\n","/**\n * @module ol/interaction/DoubleClickZoom\n */\nimport MapBrowserEventType from '../MapBrowserEventType.js';\nimport Interaction, {zoomByDelta} from '../interaction/Interaction.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [duration=250] Animation duration in milliseconds.\n * @property {number} [delta=1] The zoom delta applied on each double click.\n */\n\n\n/**\n * @classdesc\n * Allows the user to zoom by double-clicking on the map.\n * @api\n */\nclass DoubleClickZoom extends Interaction {\n\n  /**\n   * @param {module:ol/interaction/DoubleClickZoom~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n    super({\n      handleEvent: handleEvent\n    });\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.delta_ = options.delta ? options.delta : 1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 250;\n\n  }\n\n}\n\n\n/**\n * Handles the {@link module:ol/MapBrowserEvent map browser event} (if it was a\n * doubleclick) and eventually zooms the map.\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} `false` to stop event propagation.\n * @this {module:ol/interaction/DoubleClickZoom}\n */\nfunction handleEvent(mapBrowserEvent) {\n  let stopEvent = false;\n  const browserEvent = mapBrowserEvent.originalEvent;\n  if (mapBrowserEvent.type == MapBrowserEventType.DBLCLICK) {\n    const map = mapBrowserEvent.map;\n    const anchor = mapBrowserEvent.coordinate;\n    const delta = browserEvent.shiftKey ? -this.delta_ : this.delta_;\n    const view = map.getView();\n    zoomByDelta(view, delta, anchor, this.duration_);\n    mapBrowserEvent.preventDefault();\n    stopEvent = true;\n  }\n  return !stopEvent;\n}\n\nexport default DoubleClickZoom;\n","/**\n * @module ol/events/condition\n */\nimport MapBrowserEventType from '../MapBrowserEventType.js';\nimport {assert} from '../asserts.js';\nimport {TRUE, FALSE} from '../functions.js';\nimport {WEBKIT, MAC} from '../has.js';\n\n\n/**\n * A function that takes an {@link module:ol/MapBrowserEvent} and returns a\n * `{boolean}`. If the condition is met, true should be returned.\n *\n * @typedef {function(this: ?, module:ol/MapBrowserEvent): boolean} Condition\n */\n\n\n/**\n * Return `true` if only the alt-key is pressed, `false` otherwise (e.g. when\n * additionally the shift-key is pressed).\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True if only the alt key is pressed.\n * @api\n */\nexport const altKeyOnly = function(mapBrowserEvent) {\n  const originalEvent = mapBrowserEvent.originalEvent;\n  return (\n    originalEvent.altKey &&\n      !(originalEvent.metaKey || originalEvent.ctrlKey) &&\n      !originalEvent.shiftKey);\n};\n\n\n/**\n * Return `true` if only the alt-key and shift-key is pressed, `false` otherwise\n * (e.g. when additionally the platform-modifier-key is pressed).\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True if only the alt and shift keys are pressed.\n * @api\n */\nexport const altShiftKeysOnly = function(mapBrowserEvent) {\n  const originalEvent = mapBrowserEvent.originalEvent;\n  return (\n    originalEvent.altKey &&\n      !(originalEvent.metaKey || originalEvent.ctrlKey) &&\n      originalEvent.shiftKey);\n};\n\n\n/**\n * Return `true` if the map has the focus. This condition requires a map target\n * element with a `tabindex` attribute, e.g. `<div id=\"map\" tabindex=\"1\">`.\n *\n * @param {module:ol/MapBrowserEvent} event Map browser event.\n * @return {boolean} The map has the focus.\n * @api\n */\nexport const focus = function(event) {\n  return event.target.getTargetElement() === document.activeElement;\n};\n\n\n/**\n * Return always true.\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True.\n * @function\n * @api\n */\nexport const always = TRUE;\n\n\n/**\n * Return `true` if the event is a `click` event, `false` otherwise.\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True if the event is a map `click` event.\n * @api\n */\nexport const click = function(mapBrowserEvent) {\n  return mapBrowserEvent.type == MapBrowserEventType.CLICK;\n};\n\n\n/**\n * Return `true` if the event has an \"action\"-producing mouse button.\n *\n * By definition, this includes left-click on windows/linux, and left-click\n * without the ctrl key on Macs.\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} The result.\n */\nexport const mouseActionButton = function(mapBrowserEvent) {\n  const originalEvent = mapBrowserEvent.originalEvent;\n  return originalEvent.button == 0 &&\n      !(WEBKIT && MAC && originalEvent.ctrlKey);\n};\n\n\n/**\n * Return always false.\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} False.\n * @function\n * @api\n */\nexport const never = FALSE;\n\n\n/**\n * Return `true` if the browser event is a `pointermove` event, `false`\n * otherwise.\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True if the browser event is a `pointermove` event.\n * @api\n */\nexport const pointerMove = function(mapBrowserEvent) {\n  return mapBrowserEvent.type == 'pointermove';\n};\n\n\n/**\n * Return `true` if the event is a map `singleclick` event, `false` otherwise.\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True if the event is a map `singleclick` event.\n * @api\n */\nexport const singleClick = function(mapBrowserEvent) {\n  return mapBrowserEvent.type == MapBrowserEventType.SINGLECLICK;\n};\n\n\n/**\n * Return `true` if the event is a map `dblclick` event, `false` otherwise.\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True if the event is a map `dblclick` event.\n * @api\n */\nexport const doubleClick = function(mapBrowserEvent) {\n  return mapBrowserEvent.type == MapBrowserEventType.DBLCLICK;\n};\n\n\n/**\n * Return `true` if no modifier key (alt-, shift- or platform-modifier-key) is\n * pressed.\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True only if there no modifier keys are pressed.\n * @api\n */\nexport const noModifierKeys = function(mapBrowserEvent) {\n  const originalEvent = mapBrowserEvent.originalEvent;\n  return (\n    !originalEvent.altKey &&\n      !(originalEvent.metaKey || originalEvent.ctrlKey) &&\n      !originalEvent.shiftKey);\n};\n\n\n/**\n * Return `true` if only the platform-modifier-key (the meta-key on Mac,\n * ctrl-key otherwise) is pressed, `false` otherwise (e.g. when additionally\n * the shift-key is pressed).\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True if only the platform modifier key is pressed.\n * @api\n */\nexport const platformModifierKeyOnly = function(mapBrowserEvent) {\n  const originalEvent = mapBrowserEvent.originalEvent;\n  return !originalEvent.altKey &&\n    (MAC ? originalEvent.metaKey : originalEvent.ctrlKey) &&\n    !originalEvent.shiftKey;\n};\n\n\n/**\n * Return `true` if only the shift-key is pressed, `false` otherwise (e.g. when\n * additionally the alt-key is pressed).\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True if only the shift key is pressed.\n * @api\n */\nexport const shiftKeyOnly = function(mapBrowserEvent) {\n  const originalEvent = mapBrowserEvent.originalEvent;\n  return (\n    !originalEvent.altKey &&\n      !(originalEvent.metaKey || originalEvent.ctrlKey) &&\n      originalEvent.shiftKey);\n};\n\n\n/**\n * Return `true` if the target element is not editable, i.e. not a `<input>`-,\n * `<select>`- or `<textarea>`-element, `false` otherwise.\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True only if the target element is not editable.\n * @api\n */\nexport const targetNotEditable = function(mapBrowserEvent) {\n  const target = mapBrowserEvent.originalEvent.target;\n  const tagName = target.tagName;\n  return (\n    tagName !== 'INPUT' &&\n      tagName !== 'SELECT' &&\n      tagName !== 'TEXTAREA');\n};\n\n\n/**\n * Return `true` if the event originates from a mouse device.\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True if the event originates from a mouse device.\n * @api\n */\nexport const mouseOnly = function(mapBrowserEvent) {\n  assert(mapBrowserEvent.pointerEvent, 56); // mapBrowserEvent must originate from a pointer event\n  // see http://www.w3.org/TR/pointerevents/#widl-PointerEvent-pointerType\n  return (\n    /** @type {module:ol/MapBrowserEvent} */ (mapBrowserEvent).pointerEvent.pointerType == 'mouse'\n  );\n};\n\n\n/**\n * Return `true` if the event originates from a primary pointer in\n * contact with the surface or if the left mouse button is pressed.\n * See http://www.w3.org/TR/pointerevents/#button-states.\n *\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} True if the event originates from a primary pointer.\n * @api\n */\nexport const primaryAction = function(mapBrowserEvent) {\n  const pointerEvent = mapBrowserEvent.pointerEvent;\n  return pointerEvent.isPrimary && pointerEvent.button === 0;\n};\n","/**\n * @module ol/interaction/Pointer\n */\nimport {FALSE, VOID} from '../functions.js';\nimport MapBrowserEventType from '../MapBrowserEventType.js';\nimport MapBrowserPointerEvent from '../MapBrowserPointerEvent.js';\nimport Interaction from '../interaction/Interaction.js';\nimport {getValues} from '../obj.js';\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @this {module:ol/interaction/Pointer}\n */\nconst handleDragEvent = VOID;\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Capture dragging.\n * @this {module:ol/interaction/Pointer}\n */\nconst handleUpEvent = FALSE;\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Capture dragging.\n * @this {module:ol/interaction/Pointer}\n */\nconst handleDownEvent = FALSE;\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @this {module:ol/interaction/Pointer}\n */\nconst handleMoveEvent = VOID;\n\n\n/**\n * @typedef {Object} Options\n * @property {function(module:ol/MapBrowserPointerEvent):boolean} [handleDownEvent]\n * Function handling \"down\" events. If the function returns `true` then a drag\n * sequence is started.\n * @property {function(module:ol/MapBrowserPointerEvent)} [handleDragEvent]\n * Function handling \"drag\" events. This function is called on \"move\" events\n * during a drag sequence.\n * @property {function(module:ol/MapBrowserEvent):boolean} [handleEvent]\n * Method called by the map to notify the interaction that a browser event was\n * dispatched to the map. The function may return `false` to prevent the\n * propagation of the event to other interactions in the map's interactions\n * chain.\n * @property {function(module:ol/MapBrowserPointerEvent)} [handleMoveEvent]\n * Function handling \"move\" events. This function is called on \"move\" events,\n * also during a drag sequence (so during a drag sequence both the\n * `handleDragEvent` function and this function are called).\n * @property {function(module:ol/MapBrowserPointerEvent):boolean} [handleUpEvent]\n *  Function handling \"up\" events. If the function returns `false` then the\n * current drag sequence is stopped.\n * @property {function(boolean):boolean} stopDown\n * Should the down event be propagated to other interactions, or should be\n * stopped?\n */\n\n\n/**\n * @classdesc\n * Base class that calls user-defined functions on `down`, `move` and `up`\n * events. This class also manages \"drag sequences\".\n *\n * When the `handleDownEvent` user function returns `true` a drag sequence is\n * started. During a drag sequence the `handleDragEvent` user function is\n * called on `move` events. The drag sequence ends when the `handleUpEvent`\n * user function is called and returns `false`.\n * @api\n */\nclass PointerInteraction extends Interaction {\n  /**\n   * @param {module:ol/interaction/Pointer~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super({\n      handleEvent: options.handleEvent || handleEvent\n    });\n\n    /**\n     * @type {function(module:ol/MapBrowserPointerEvent):boolean}\n     * @private\n     */\n    this.handleDownEvent_ = options.handleDownEvent ?\n      options.handleDownEvent : handleDownEvent;\n\n    /**\n     * @type {function(module:ol/MapBrowserPointerEvent)}\n     * @private\n     */\n    this.handleDragEvent_ = options.handleDragEvent ?\n      options.handleDragEvent : handleDragEvent;\n\n    /**\n     * @type {function(module:ol/MapBrowserPointerEvent)}\n     * @private\n     */\n    this.handleMoveEvent_ = options.handleMoveEvent ?\n      options.handleMoveEvent : handleMoveEvent;\n\n    /**\n     * @type {function(module:ol/MapBrowserPointerEvent):boolean}\n     * @private\n     */\n    this.handleUpEvent_ = options.handleUpEvent ?\n      options.handleUpEvent : handleUpEvent;\n\n    /**\n     * @type {boolean}\n     * @protected\n     */\n    this.handlingDownUpSequence = false;\n\n    /**\n     * This function is used to determine if \"down\" events should be propagated\n     * to other interactions or should be stopped.\n     * @type {function(boolean):boolean}\n     * @protected\n     */\n    this.stopDown = options.stopDown ? options.stopDown : stopDown;\n\n    /**\n     * @type {!Object<string, module:ol/pointer/PointerEvent>}\n     * @private\n     */\n    this.trackedPointers_ = {};\n\n    /**\n     * @type {Array<module:ol/pointer/PointerEvent>}\n     * @protected\n     */\n    this.targetPointers = [];\n\n  }\n\n  /**\n   * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n   * @private\n   */\n  updateTrackedPointers_(mapBrowserEvent) {\n    if (isPointerDraggingEvent(mapBrowserEvent)) {\n      const event = mapBrowserEvent.pointerEvent;\n\n      const id = event.pointerId.toString();\n      if (mapBrowserEvent.type == MapBrowserEventType.POINTERUP) {\n        delete this.trackedPointers_[id];\n      } else if (mapBrowserEvent.type ==\n          MapBrowserEventType.POINTERDOWN) {\n        this.trackedPointers_[id] = event;\n      } else if (id in this.trackedPointers_) {\n        // update only when there was a pointerdown event for this pointer\n        this.trackedPointers_[id] = event;\n      }\n      this.targetPointers = getValues(this.trackedPointers_);\n    }\n  }\n\n}\n\n\n/**\n * @param {Array<module:ol/pointer/PointerEvent>} pointerEvents List of events.\n * @return {module:ol/pixel~Pixel} Centroid pixel.\n */\nexport function centroid(pointerEvents) {\n  const length = pointerEvents.length;\n  let clientX = 0;\n  let clientY = 0;\n  for (let i = 0; i < length; i++) {\n    clientX += pointerEvents[i].clientX;\n    clientY += pointerEvents[i].clientY;\n  }\n  return [clientX / length, clientY / length];\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Whether the event is a pointerdown, pointerdrag\n *     or pointerup event.\n */\nfunction isPointerDraggingEvent(mapBrowserEvent) {\n  const type = mapBrowserEvent.type;\n  return type === MapBrowserEventType.POINTERDOWN ||\n    type === MapBrowserEventType.POINTERDRAG ||\n    type === MapBrowserEventType.POINTERUP;\n}\n\n\n/**\n * Handles the {@link module:ol/MapBrowserEvent map browser event} and may call into\n * other functions, if event sequences like e.g. 'drag' or 'down-up' etc. are\n * detected.\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} `false` to stop event propagation.\n * @this {module:ol/interaction/Pointer}\n * @api\n */\nexport function handleEvent(mapBrowserEvent) {\n  if (!(mapBrowserEvent instanceof MapBrowserPointerEvent)) {\n    return true;\n  }\n\n  let stopEvent = false;\n  this.updateTrackedPointers_(mapBrowserEvent);\n  if (this.handlingDownUpSequence) {\n    if (mapBrowserEvent.type == MapBrowserEventType.POINTERDRAG) {\n      this.handleDragEvent_(mapBrowserEvent);\n    } else if (mapBrowserEvent.type == MapBrowserEventType.POINTERUP) {\n      const handledUp = this.handleUpEvent_(mapBrowserEvent);\n      this.handlingDownUpSequence = handledUp && this.targetPointers.length > 0;\n    }\n  } else {\n    if (mapBrowserEvent.type == MapBrowserEventType.POINTERDOWN) {\n      const handled = this.handleDownEvent_(mapBrowserEvent);\n      if (handled) {\n        mapBrowserEvent.preventDefault();\n      }\n      this.handlingDownUpSequence = handled;\n      stopEvent = this.stopDown(handled);\n    } else if (mapBrowserEvent.type == MapBrowserEventType.POINTERMOVE) {\n      this.handleMoveEvent_(mapBrowserEvent);\n    }\n  }\n  return !stopEvent;\n}\n\n\nexport default PointerInteraction;\n\n/**\n * @param {boolean} handled Was the event handled by the interaction?\n * @return {boolean} Should the `down` event be stopped?\n */\nfunction stopDown(handled) {\n  return handled;\n}\n","/**\n * @module ol/interaction/DragPan\n */\nimport ViewHint from '../ViewHint.js';\nimport {scale as scaleCoordinate, rotate as rotateCoordinate, add as addCoordinate} from '../coordinate.js';\nimport {easeOut} from '../easing.js';\nimport {noModifierKeys} from '../events/condition.js';\nimport {FALSE} from '../functions.js';\nimport PointerInteraction, {centroid as centroidFromPointers} from '../interaction/Pointer.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/events/condition~Condition} [condition] A function that takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a boolean\n * to indicate whether that event should be handled.\n * Default is {@link module:ol/events/condition~noModifierKeys}.\n * @property {module:ol/Kinetic} [kinetic] Kinetic inertia to apply to the pan.\n */\n\n\n/**\n * @classdesc\n * Allows the user to pan the map by dragging the map.\n * @api\n */\nclass DragPan extends PointerInteraction {\n  /**\n   * @param {module:ol/interaction/DragPan~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    super({\n      handleDownEvent: handleDownEvent,\n      handleDragEvent: handleDragEvent,\n      handleUpEvent: handleUpEvent,\n      stopDown: FALSE\n    });\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n     * @private\n     * @type {module:ol/Kinetic|undefined}\n     */\n    this.kinetic_ = options.kinetic;\n\n    /**\n     * @type {module:ol/pixel~Pixel}\n     */\n    this.lastCentroid = null;\n\n    /**\n     * @type {number}\n     */\n    this.lastPointersCount_;\n\n    /**\n     * @type {boolean}\n     */\n    this.panning_ = false;\n\n    /**\n     * @private\n     * @type {module:ol/events/condition~Condition}\n     */\n    this.condition_ = options.condition ? options.condition : noModifierKeys;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.noKinetic_ = false;\n\n  }\n\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @this {module:ol/interaction/DragPan}\n */\nfunction handleDragEvent(mapBrowserEvent) {\n  if (!this.panning_) {\n    this.panning_ = true;\n    this.getMap().getView().setHint(ViewHint.INTERACTING, 1);\n  }\n  const targetPointers = this.targetPointers;\n  const centroid = centroidFromPointers(targetPointers);\n  if (targetPointers.length == this.lastPointersCount_) {\n    if (this.kinetic_) {\n      this.kinetic_.update(centroid[0], centroid[1]);\n    }\n    if (this.lastCentroid) {\n      const deltaX = this.lastCentroid[0] - centroid[0];\n      const deltaY = centroid[1] - this.lastCentroid[1];\n      const map = mapBrowserEvent.map;\n      const view = map.getView();\n      let center = [deltaX, deltaY];\n      scaleCoordinate(center, view.getResolution());\n      rotateCoordinate(center, view.getRotation());\n      addCoordinate(center, view.getCenter());\n      center = view.constrainCenter(center);\n      view.setCenter(center);\n    }\n  } else if (this.kinetic_) {\n    // reset so we don't overestimate the kinetic energy after\n    // after one finger down, tiny drag, second finger down\n    this.kinetic_.begin();\n  }\n  this.lastCentroid = centroid;\n  this.lastPointersCount_ = targetPointers.length;\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Stop drag sequence?\n * @this {module:ol/interaction/DragPan}\n */\nfunction handleUpEvent(mapBrowserEvent) {\n  const map = mapBrowserEvent.map;\n  const view = map.getView();\n  if (this.targetPointers.length === 0) {\n    if (!this.noKinetic_ && this.kinetic_ && this.kinetic_.end()) {\n      const distance = this.kinetic_.getDistance();\n      const angle = this.kinetic_.getAngle();\n      const center = /** @type {!module:ol/coordinate~Coordinate} */ (view.getCenter());\n      const centerpx = map.getPixelFromCoordinate(center);\n      const dest = map.getCoordinateFromPixel([\n        centerpx[0] - distance * Math.cos(angle),\n        centerpx[1] - distance * Math.sin(angle)\n      ]);\n      view.animate({\n        center: view.constrainCenter(dest),\n        duration: 500,\n        easing: easeOut\n      });\n    }\n    if (this.panning_) {\n      this.panning_ = false;\n      view.setHint(ViewHint.INTERACTING, -1);\n    }\n    return false;\n  } else {\n    if (this.kinetic_) {\n      // reset so we don't overestimate the kinetic energy after\n      // after one finger up, tiny drag, second finger up\n      this.kinetic_.begin();\n    }\n    this.lastCentroid = null;\n    return true;\n  }\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Start drag sequence?\n * @this {module:ol/interaction/DragPan}\n */\nfunction handleDownEvent(mapBrowserEvent) {\n  if (this.targetPointers.length > 0 && this.condition_(mapBrowserEvent)) {\n    const map = mapBrowserEvent.map;\n    const view = map.getView();\n    this.lastCentroid = null;\n    // stop any current animation\n    if (view.getAnimating()) {\n      view.setCenter(mapBrowserEvent.frameState.viewState.center);\n    }\n    if (this.kinetic_) {\n      this.kinetic_.begin();\n    }\n    // No kinetic as soon as more than one pointer on the screen is\n    // detected. This is to prevent nasty pans after pinch.\n    this.noKinetic_ = this.targetPointers.length > 1;\n    return true;\n  } else {\n    return false;\n  }\n}\n\n\nexport default DragPan;\n","/**\n * @module ol/interaction/DragRotate\n */\nimport {disable} from '../rotationconstraint.js';\nimport ViewHint from '../ViewHint.js';\nimport {altShiftKeysOnly, mouseOnly, mouseActionButton} from '../events/condition.js';\nimport {FALSE} from '../functions.js';\nimport {rotate, rotateWithoutConstraints} from '../interaction/Interaction.js';\nimport PointerInteraction from '../interaction/Pointer.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/events/condition~Condition} [condition] A function that takes an\n * {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a boolean\n * to indicate whether that event should be handled.\n * Default is {@link module:ol/events/condition~altShiftKeysOnly}.\n * @property {number} [duration=250] Animation duration in milliseconds.\n */\n\n\n/**\n * @classdesc\n * Allows the user to rotate the map by clicking and dragging on the map,\n * normally combined with an {@link module:ol/events/condition} that limits\n * it to when the alt and shift keys are held down.\n *\n * This interaction is only supported for mouse devices.\n * @api\n */\nclass DragRotate extends PointerInteraction {\n\n  /**\n   * @param {module:ol/interaction/DragRotate~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super({\n      handleDownEvent: handleDownEvent,\n      handleDragEvent: handleDragEvent,\n      handleUpEvent: handleUpEvent,\n      stopDown: FALSE\n    });\n\n    /**\n     * @private\n     * @type {module:ol/events/condition~Condition}\n     */\n    this.condition_ = options.condition ? options.condition : altShiftKeysOnly;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.lastAngle_ = undefined;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 250;\n\n  }\n\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @this {module:ol/interaction/DragRotate}\n */\nfunction handleDragEvent(mapBrowserEvent) {\n  if (!mouseOnly(mapBrowserEvent)) {\n    return;\n  }\n\n  const map = mapBrowserEvent.map;\n  const view = map.getView();\n  if (view.getConstraints().rotation === disable) {\n    return;\n  }\n  const size = map.getSize();\n  const offset = mapBrowserEvent.pixel;\n  const theta =\n      Math.atan2(size[1] / 2 - offset[1], offset[0] - size[0] / 2);\n  if (this.lastAngle_ !== undefined) {\n    const delta = theta - this.lastAngle_;\n    const rotation = view.getRotation();\n    rotateWithoutConstraints(view, rotation - delta);\n  }\n  this.lastAngle_ = theta;\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Stop drag sequence?\n * @this {module:ol/interaction/DragRotate}\n */\nfunction handleUpEvent(mapBrowserEvent) {\n  if (!mouseOnly(mapBrowserEvent)) {\n    return true;\n  }\n\n  const map = mapBrowserEvent.map;\n  const view = map.getView();\n  view.setHint(ViewHint.INTERACTING, -1);\n  const rotation = view.getRotation();\n  rotate(view, rotation, undefined, this.duration_);\n  return false;\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Start drag sequence?\n * @this {module:ol/interaction/DragRotate}\n */\nfunction handleDownEvent(mapBrowserEvent) {\n  if (!mouseOnly(mapBrowserEvent)) {\n    return false;\n  }\n\n  if (mouseActionButton(mapBrowserEvent) && this.condition_(mapBrowserEvent)) {\n    const map = mapBrowserEvent.map;\n    map.getView().setHint(ViewHint.INTERACTING, 1);\n    this.lastAngle_ = undefined;\n    return true;\n  } else {\n    return false;\n  }\n}\n\nexport default DragRotate;\n","/**\n * @module ol/render/Box\n */\n\nimport Disposable from '../Disposable.js';\nimport Polygon from '../geom/Polygon.js';\n\nclass RenderBox extends Disposable {\n  /**\n   * @param {string} className CSS class name.\n   */\n  constructor(className) {\n    super();\n\n    /**\n     * @type {module:ol/geom/Polygon}\n     * @private\n     */\n    this.geometry_ = null;\n\n    /**\n     * @type {HTMLDivElement}\n     * @private\n     */\n    this.element_ = /** @type {HTMLDivElement} */ (document.createElement('div'));\n    this.element_.style.position = 'absolute';\n    this.element_.className = 'ol-box ' + className;\n\n    /**\n     * @private\n     * @type {module:ol/PluggableMap}\n     */\n    this.map_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/pixel~Pixel}\n     */\n    this.startPixel_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/pixel~Pixel}\n     */\n    this.endPixel_ = null;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    this.setMap(null);\n  }\n\n  /**\n   * @private\n   */\n  render_() {\n    const startPixel = this.startPixel_;\n    const endPixel = this.endPixel_;\n    const px = 'px';\n    const style = this.element_.style;\n    style.left = Math.min(startPixel[0], endPixel[0]) + px;\n    style.top = Math.min(startPixel[1], endPixel[1]) + px;\n    style.width = Math.abs(endPixel[0] - startPixel[0]) + px;\n    style.height = Math.abs(endPixel[1] - startPixel[1]) + px;\n  }\n\n  /**\n   * @param {module:ol/PluggableMap} map Map.\n   */\n  setMap(map) {\n    if (this.map_) {\n      this.map_.getOverlayContainer().removeChild(this.element_);\n      const style = this.element_.style;\n      style.left = style.top = style.width = style.height = 'inherit';\n    }\n    this.map_ = map;\n    if (this.map_) {\n      this.map_.getOverlayContainer().appendChild(this.element_);\n    }\n  }\n\n  /**\n   * @param {module:ol/pixel~Pixel} startPixel Start pixel.\n   * @param {module:ol/pixel~Pixel} endPixel End pixel.\n   */\n  setPixels(startPixel, endPixel) {\n    this.startPixel_ = startPixel;\n    this.endPixel_ = endPixel;\n    this.createOrUpdateGeometry();\n    this.render_();\n  }\n\n  /**\n   * Creates or updates the cached geometry.\n   */\n  createOrUpdateGeometry() {\n    const startPixel = this.startPixel_;\n    const endPixel = this.endPixel_;\n    const pixels = [\n      startPixel,\n      [startPixel[0], endPixel[1]],\n      endPixel,\n      [endPixel[0], startPixel[1]]\n    ];\n    const coordinates = pixels.map(this.map_.getCoordinateFromPixel, this.map_);\n    // close the polygon\n    coordinates[4] = coordinates[0].slice();\n    if (!this.geometry_) {\n      this.geometry_ = new Polygon([coordinates]);\n    } else {\n      this.geometry_.setCoordinates([coordinates]);\n    }\n  }\n\n  /**\n   * @return {module:ol/geom/Polygon} Geometry.\n   */\n  getGeometry() {\n    return this.geometry_;\n  }\n}\n\n\nexport default RenderBox;\n","/**\n * @module ol/interaction/DragBox\n */\n// FIXME draw drag box\nimport Event from '../events/Event.js';\nimport {always, mouseOnly, mouseActionButton} from '../events/condition.js';\nimport {VOID} from '../functions.js';\nimport PointerInteraction from '../interaction/Pointer.js';\nimport RenderBox from '../render/Box.js';\n\n\n/**\n * A function that takes a {@link module:ol/MapBrowserEvent} and two\n * {@link module:ol/pixel~Pixel}s and returns a `{boolean}`. If the condition is met,\n * true should be returned.\n * @typedef {function(this: ?, module:ol/MapBrowserEvent, module:ol/pixel~Pixel, module:ol/pixel~Pixel):boolean} EndCondition\n */\n\n\n/**\n * @typedef {Object} Options\n * @property {string} [className='ol-dragbox'] CSS class name for styling the box.\n * @property {module:ol/events/condition~Condition} [condition] A function that takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a boolean\n * to indicate whether that event should be handled.\n * Default is {@link ol/events/condition~always}.\n * @property {number} [minArea=64] The minimum area of the box in pixel, this value is used by the default\n * `boxEndCondition` function.\n * @property {module:ol/interaction/DragBox~EndCondition} [boxEndCondition] A function that takes a {@link module:ol/MapBrowserEvent~MapBrowserEvent} and two\n * {@link module:ol/pixel~Pixel}s to indicate whether a `boxend` event should be fired.\n * Default is `true` if the area of the box is bigger than the `minArea` option.\n * @property {function(this:module:ol/interaction/DragBox, module:ol/MapBrowserEvent)} onBoxEnd Code to execute just\n * before `boxend` is fired.\n */\n\n\n/**\n * @enum {string}\n */\nconst DragBoxEventType = {\n  /**\n   * Triggered upon drag box start.\n   * @event module:ol/interaction/DragBox~DragBoxEvent#boxstart\n   * @api\n   */\n  BOXSTART: 'boxstart',\n\n  /**\n   * Triggered on drag when box is active.\n   * @event module:ol/interaction/DragBox~DragBoxEvent#boxdrag\n   * @api\n   */\n  BOXDRAG: 'boxdrag',\n\n  /**\n   * Triggered upon drag box end.\n   * @event module:ol/interaction/DragBox~DragBoxEvent#boxend\n   * @api\n   */\n  BOXEND: 'boxend'\n};\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/interaction/DragBox~DragBox} instances are instances of\n * this type.\n */\nclass DragBoxEvent extends Event {\n\n  /**\n   * @param {string} type The event type.\n   * @param {module:ol/coordinate~Coordinate} coordinate The event coordinate.\n   * @param {module:ol/MapBrowserEvent} mapBrowserEvent Originating event.\n   */\n  constructor(type, coordinate, mapBrowserEvent) {\n    super(type);\n\n    /**\n     * The coordinate of the drag event.\n     * @const\n     * @type {module:ol/coordinate~Coordinate}\n     * @api\n     */\n    this.coordinate = coordinate;\n\n    /**\n     * @const\n     * @type {module:ol/MapBrowserEvent}\n     * @api\n     */\n    this.mapBrowserEvent = mapBrowserEvent;\n\n  }\n\n}\n\n\n/**\n * @classdesc\n * Allows the user to draw a vector box by clicking and dragging on the map,\n * normally combined with an {@link module:ol/events/condition} that limits\n * it to when the shift or other key is held down. This is used, for example,\n * for zooming to a specific area of the map\n * (see {@link module:ol/interaction/DragZoom~DragZoom} and\n * {@link module:ol/interaction/DragRotateAndZoom}).\n *\n * This interaction is only supported for mouse devices.\n *\n * @fires module:ol/interaction/DragBox~DragBoxEvent\n * @api\n */\nclass DragBox extends PointerInteraction {\n  /**\n   * @param {module:ol/interaction/DragBox~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    super({\n      handleDownEvent: handleDownEvent,\n      handleDragEvent: handleDragEvent,\n      handleUpEvent: handleUpEvent\n    });\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n    * @type {module:ol/render/Box}\n    * @private\n    */\n    this.box_ = new RenderBox(options.className || 'ol-dragbox');\n\n    /**\n    * @type {number}\n    * @private\n    */\n    this.minArea_ = options.minArea !== undefined ? options.minArea : 64;\n\n    /**\n     * Function to execute just before `onboxend` is fired\n     * @type {function(this:module:ol/interaction/DragBox, module:ol/MapBrowserEvent)}\n     * @private\n     */\n    this.onBoxEnd_ = options.onBoxEnd ? options.onBoxEnd : VOID;\n\n    /**\n    * @type {module:ol/pixel~Pixel}\n    * @private\n    */\n    this.startPixel_ = null;\n\n    /**\n    * @private\n    * @type {module:ol/events/condition~Condition}\n    */\n    this.condition_ = options.condition ? options.condition : always;\n\n    /**\n    * @private\n    * @type {module:ol/interaction/DragBox~EndCondition}\n    */\n    this.boxEndCondition_ = options.boxEndCondition ?\n      options.boxEndCondition : defaultBoxEndCondition;\n  }\n\n  /**\n  * Returns geometry of last drawn box.\n  * @return {module:ol/geom/Polygon} Geometry.\n  * @api\n  */\n  getGeometry() {\n    return this.box_.getGeometry();\n  }\n}\n\n\n/**\n * The default condition for determining whether the boxend event\n * should fire.\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent The originating MapBrowserEvent\n *     leading to the box end.\n * @param {module:ol/pixel~Pixel} startPixel The starting pixel of the box.\n * @param {module:ol/pixel~Pixel} endPixel The end pixel of the box.\n * @return {boolean} Whether or not the boxend condition should be fired.\n * @this {module:ol/interaction/DragBox}\n */\nfunction defaultBoxEndCondition(mapBrowserEvent, startPixel, endPixel) {\n  const width = endPixel[0] - startPixel[0];\n  const height = endPixel[1] - startPixel[1];\n  return width * width + height * height >= this.minArea_;\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @this {module:ol/interaction/DragBox}\n */\nfunction handleDragEvent(mapBrowserEvent) {\n  if (!mouseOnly(mapBrowserEvent)) {\n    return;\n  }\n\n  this.box_.setPixels(this.startPixel_, mapBrowserEvent.pixel);\n\n  this.dispatchEvent(new DragBoxEvent(DragBoxEventType.BOXDRAG,\n    mapBrowserEvent.coordinate, mapBrowserEvent));\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Stop drag sequence?\n * @this {module:ol/interaction/DragBox}\n */\nfunction handleUpEvent(mapBrowserEvent) {\n  if (!mouseOnly(mapBrowserEvent)) {\n    return true;\n  }\n\n  this.box_.setMap(null);\n\n  if (this.boxEndCondition_(mapBrowserEvent, this.startPixel_, mapBrowserEvent.pixel)) {\n    this.onBoxEnd_(mapBrowserEvent);\n    this.dispatchEvent(new DragBoxEvent(DragBoxEventType.BOXEND,\n      mapBrowserEvent.coordinate, mapBrowserEvent));\n  }\n  return false;\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Start drag sequence?\n * @this {module:ol/interaction/DragBox}\n */\nfunction handleDownEvent(mapBrowserEvent) {\n  if (!mouseOnly(mapBrowserEvent)) {\n    return false;\n  }\n\n  if (mouseActionButton(mapBrowserEvent) &&\n      this.condition_(mapBrowserEvent)) {\n    this.startPixel_ = mapBrowserEvent.pixel;\n    this.box_.setMap(mapBrowserEvent.map);\n    this.box_.setPixels(this.startPixel_, this.startPixel_);\n    this.dispatchEvent(new DragBoxEvent(DragBoxEventType.BOXSTART,\n      mapBrowserEvent.coordinate, mapBrowserEvent));\n    return true;\n  } else {\n    return false;\n  }\n}\n\n\nexport default DragBox;\n","/**\n * @module ol/interaction/DragZoom\n */\nimport {easeOut} from '../easing.js';\nimport {shiftKeyOnly} from '../events/condition.js';\nimport {createOrUpdateFromCoordinates, getBottomLeft, getCenter, getTopRight, scaleFromCenter} from '../extent.js';\nimport DragBox from '../interaction/DragBox.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {string} [className='ol-dragzoom'] CSS class name for styling the\n * box.\n * @property {module:ol/events/condition~Condition} [condition] A function that\n * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled.\n * Default is {@link module:ol/events/condition~shiftKeyOnly}.\n * @property {number} [duration=200] Animation duration in milliseconds.\n * @property {boolean} [out=false] Use interaction for zooming out.\n */\n\n\n/**\n * @classdesc\n * Allows the user to zoom the map by clicking and dragging on the map,\n * normally combined with an {@link module:ol/events/condition} that limits\n * it to when a key, shift by default, is held down.\n *\n * To change the style of the box, use CSS and the `.ol-dragzoom` selector, or\n * your custom one configured with `className`.\n * @api\n */\nclass DragZoom extends DragBox {\n  /**\n   * @param {module:ol/interaction/DragZoom~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n    const options = opt_options ? opt_options : {};\n\n    const condition = options.condition ? options.condition : shiftKeyOnly;\n\n    super({\n      condition: condition,\n      className: options.className || 'ol-dragzoom',\n      onBoxEnd: onBoxEnd\n    });\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 200;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.out_ = options.out !== undefined ? options.out : false;\n  }\n}\n\n\n/**\n * @this {module:ol/interaction/DragZoom}\n */\nfunction onBoxEnd() {\n  const map = this.getMap();\n  const view = /** @type {!module:ol/View} */ (map.getView());\n  const size = /** @type {!module:ol/size~Size} */ (map.getSize());\n  let extent = this.getGeometry().getExtent();\n\n  if (this.out_) {\n    const mapExtent = view.calculateExtent(size);\n    const boxPixelExtent = createOrUpdateFromCoordinates([\n      map.getPixelFromCoordinate(getBottomLeft(extent)),\n      map.getPixelFromCoordinate(getTopRight(extent))]);\n    const factor = view.getResolutionForExtent(boxPixelExtent, size);\n\n    scaleFromCenter(mapExtent, 1 / factor);\n    extent = mapExtent;\n  }\n\n  const resolution = view.constrainResolution(\n    view.getResolutionForExtent(extent, size));\n\n  let center = getCenter(extent);\n  center = view.constrainCenter(center);\n\n  view.animate({\n    resolution: resolution,\n    center: center,\n    duration: this.duration_,\n    easing: easeOut\n  });\n}\n\n\nexport default DragZoom;\n","/**\n * @module ol/events/KeyCode\n */\n\n/**\n * @enum {number}\n * @const\n */\nexport default {\n  LEFT: 37,\n  UP: 38,\n  RIGHT: 39,\n  DOWN: 40\n};\n","/**\n * @module ol/interaction/KeyboardPan\n */\nimport {rotate as rotateCoordinate} from '../coordinate.js';\nimport EventType from '../events/EventType.js';\nimport KeyCode from '../events/KeyCode.js';\nimport {noModifierKeys, targetNotEditable} from '../events/condition.js';\nimport Interaction, {pan} from '../interaction/Interaction.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/events/condition~Condition} [condition] A function that\n * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled. Default is\n * {@link module:ol/events/condition~noModifierKeys} and\n * {@link module:ol/events/condition~targetNotEditable}.\n * @property {number} [duration=100] Animation duration in milliseconds.\n * @property {number} [pixelDelta=128] The amount of pixels to pan on each key\n * press.\n */\n\n\n/**\n * @classdesc\n * Allows the user to pan the map using keyboard arrows.\n * Note that, although this interaction is by default included in maps,\n * the keys can only be used when browser focus is on the element to which\n * the keyboard events are attached. By default, this is the map div,\n * though you can change this with the `keyboardEventTarget` in\n * {@link module:ol/Map~Map}. `document` never loses focus but, for any other\n * element, focus will have to be on, and returned to, this element if the keys\n * are to function.\n * See also {@link module:ol/interaction/KeyboardZoom~KeyboardZoom}.\n * @api\n */\nclass KeyboardPan extends Interaction {\n  /**\n   * @param {module:ol/interaction/KeyboardPan~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    super({\n      handleEvent: handleEvent\n    });\n\n    const options = opt_options || {};\n\n    /**\n     * @private\n     * @param {module:ol/MapBrowserEvent} mapBrowserEvent Browser event.\n     * @return {boolean} Combined condition result.\n     */\n    this.defaultCondition_ = function(mapBrowserEvent) {\n      return noModifierKeys(mapBrowserEvent) &&\n        targetNotEditable(mapBrowserEvent);\n    };\n\n    /**\n     * @private\n     * @type {module:ol/events/condition~Condition}\n     */\n    this.condition_ = options.condition !== undefined ?\n      options.condition : this.defaultCondition_;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 100;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.pixelDelta_ = options.pixelDelta !== undefined ?\n      options.pixelDelta : 128;\n\n  }\n\n}\n\n\n/**\n * Handles the {@link module:ol/MapBrowserEvent map browser event} if it was a\n * `KeyEvent`, and decides the direction to pan to (if an arrow key was\n * pressed).\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} `false` to stop event propagation.\n * @this {module:ol/interaction/KeyboardPan}\n */\nfunction handleEvent(mapBrowserEvent) {\n  let stopEvent = false;\n  if (mapBrowserEvent.type == EventType.KEYDOWN) {\n    const keyEvent = mapBrowserEvent.originalEvent;\n    const keyCode = keyEvent.keyCode;\n    if (this.condition_(mapBrowserEvent) &&\n        (keyCode == KeyCode.DOWN ||\n        keyCode == KeyCode.LEFT ||\n        keyCode == KeyCode.RIGHT ||\n        keyCode == KeyCode.UP)) {\n      const map = mapBrowserEvent.map;\n      const view = map.getView();\n      const mapUnitsDelta = view.getResolution() * this.pixelDelta_;\n      let deltaX = 0, deltaY = 0;\n      if (keyCode == KeyCode.DOWN) {\n        deltaY = -mapUnitsDelta;\n      } else if (keyCode == KeyCode.LEFT) {\n        deltaX = -mapUnitsDelta;\n      } else if (keyCode == KeyCode.RIGHT) {\n        deltaX = mapUnitsDelta;\n      } else {\n        deltaY = mapUnitsDelta;\n      }\n      const delta = [deltaX, deltaY];\n      rotateCoordinate(delta, view.getRotation());\n      pan(view, delta, this.duration_);\n      mapBrowserEvent.preventDefault();\n      stopEvent = true;\n    }\n  }\n  return !stopEvent;\n}\n\nexport default KeyboardPan;\n","/**\n * @module ol/interaction/KeyboardZoom\n */\nimport EventType from '../events/EventType.js';\nimport {targetNotEditable} from '../events/condition.js';\nimport Interaction, {zoomByDelta} from '../interaction/Interaction.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [duration=100] Animation duration in milliseconds.\n * @property {module:ol/events/condition~Condition} [condition] A function that\n * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled. Default is\n * {@link module:ol/events/condition~targetNotEditable}.\n * @property {number} [delta=1] The zoom level delta on each key press.\n */\n\n\n/**\n * @classdesc\n * Allows the user to zoom the map using keyboard + and -.\n * Note that, although this interaction is by default included in maps,\n * the keys can only be used when browser focus is on the element to which\n * the keyboard events are attached. By default, this is the map div,\n * though you can change this with the `keyboardEventTarget` in\n * {@link module:ol/Map~Map}. `document` never loses focus but, for any other\n * element, focus will have to be on, and returned to, this element if the keys\n * are to function.\n * See also {@link moudle:ol/interaction/KeyboardPan~KeyboardPan}.\n * @api\n */\nclass KeyboardZoom extends Interaction {\n  /**\n   * @param {module:ol/interaction/KeyboardZoom~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    super({\n      handleEvent: handleEvent\n    });\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n     * @private\n     * @type {module:ol/events/condition~Condition}\n     */\n    this.condition_ = options.condition ? options.condition : targetNotEditable;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.delta_ = options.delta ? options.delta : 1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 100;\n\n  }\n\n}\n\n\n/**\n * Handles the {@link module:ol/MapBrowserEvent map browser event} if it was a\n * `KeyEvent`, and decides whether to zoom in or out (depending on whether the\n * key pressed was '+' or '-').\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} `false` to stop event propagation.\n * @this {module:ol/interaction/KeyboardZoom}\n */\nfunction handleEvent(mapBrowserEvent) {\n  let stopEvent = false;\n  if (mapBrowserEvent.type == EventType.KEYDOWN ||\n      mapBrowserEvent.type == EventType.KEYPRESS) {\n    const keyEvent = mapBrowserEvent.originalEvent;\n    const charCode = keyEvent.charCode;\n    if (this.condition_(mapBrowserEvent) &&\n        (charCode == '+'.charCodeAt(0) || charCode == '-'.charCodeAt(0))) {\n      const map = mapBrowserEvent.map;\n      const delta = (charCode == '+'.charCodeAt(0)) ? this.delta_ : -this.delta_;\n      const view = map.getView();\n      zoomByDelta(view, delta, undefined, this.duration_);\n      mapBrowserEvent.preventDefault();\n      stopEvent = true;\n    }\n  }\n  return !stopEvent;\n}\n\nexport default KeyboardZoom;\n","/**\n * @module ol/interaction/MouseWheelZoom\n */\nimport ViewHint from '../ViewHint.js';\nimport {always} from '../events/condition.js';\nimport {easeOut} from '../easing.js';\nimport EventType from '../events/EventType.js';\nimport {DEVICE_PIXEL_RATIO, FIREFOX, SAFARI} from '../has.js';\nimport Interaction, {zoomByDelta} from '../interaction/Interaction.js';\nimport {clamp} from '../math.js';\n\n\n/**\n * Maximum mouse wheel delta.\n * @type {number}\n */\nconst MAX_DELTA = 1;\n\n\n/**\n * @enum {string}\n */\nexport const Mode = {\n  TRACKPAD: 'trackpad',\n  WHEEL: 'wheel'\n};\n\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/events/condition~Condition} [condition] A function that\n * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled. Default is\n * {@link module:ol/events/condition~always}.\n * @property {number} [duration=250] Animation duration in milliseconds.\n * @property {number} [timeout=80] Mouse wheel timeout duration in milliseconds.\n * @property {boolean} [constrainResolution=false] When using a trackpad or\n * magic mouse, zoom to the closest integer zoom level after the scroll gesture\n * ends.\n * @property {boolean} [useAnchor=true] Enable zooming using the mouse's\n * location as the anchor. When set to `false`, zooming in and out will zoom to\n * the center of the screen instead of zooming on the mouse's location.\n */\n\n\n/**\n * @classdesc\n * Allows the user to zoom the map by scrolling the mouse wheel.\n * @api\n */\nclass MouseWheelZoom extends Interaction {\n  /**\n   * @param {module:ol/interaction/MouseWheelZoom~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    super({\n      handleEvent: handleEvent\n    });\n\n    const options = opt_options || {};\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.delta_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 250;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.timeout_ = options.timeout !== undefined ? options.timeout : 80;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.useAnchor_ = options.useAnchor !== undefined ? options.useAnchor : true;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.constrainResolution_ = options.constrainResolution || false;\n\n    /**\n     * @private\n     * @type {module:ol/events/condition~Condition}\n     */\n    this.condition_ = options.condition ? options.condition : always;\n\n    /**\n     * @private\n     * @type {?module:ol/coordinate~Coordinate}\n     */\n    this.lastAnchor_ = null;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.startTime_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.timeoutId_ = undefined;\n\n    /**\n     * @private\n     * @type {module:ol/interaction/MouseWheelZoom~Mode|undefined}\n     */\n    this.mode_ = undefined;\n\n    /**\n     * Trackpad events separated by this delay will be considered separate\n     * interactions.\n     * @type {number}\n     */\n    this.trackpadEventGap_ = 400;\n\n    /**\n     * @type {number|undefined}\n     */\n    this.trackpadTimeoutId_ = undefined;\n\n    /**\n     * The number of delta values per zoom level\n     * @private\n     * @type {number}\n     */\n    this.trackpadDeltaPerZoom_ = 300;\n\n    /**\n     * The zoom factor by which scroll zooming is allowed to exceed the limits.\n     * @private\n     * @type {number}\n     */\n    this.trackpadZoomBuffer_ = 1.5;\n\n  }\n\n  /**\n   * @private\n   */\n  decrementInteractingHint_() {\n    this.trackpadTimeoutId_ = undefined;\n    const view = this.getMap().getView();\n    view.setHint(ViewHint.INTERACTING, -1);\n  }\n\n  /**\n   * @private\n   * @param {module:ol/PluggableMap} map Map.\n   */\n  handleWheelZoom_(map) {\n    const view = map.getView();\n    if (view.getAnimating()) {\n      view.cancelAnimations();\n    }\n    const maxDelta = MAX_DELTA;\n    const delta = clamp(this.delta_, -maxDelta, maxDelta);\n    zoomByDelta(view, -delta, this.lastAnchor_, this.duration_);\n    this.mode_ = undefined;\n    this.delta_ = 0;\n    this.lastAnchor_ = null;\n    this.startTime_ = undefined;\n    this.timeoutId_ = undefined;\n  }\n\n  /**\n   * Enable or disable using the mouse's location as an anchor when zooming\n   * @param {boolean} useAnchor true to zoom to the mouse's location, false\n   * to zoom to the center of the map\n   * @api\n   */\n  setMouseAnchor(useAnchor) {\n    this.useAnchor_ = useAnchor;\n    if (!useAnchor) {\n      this.lastAnchor_ = null;\n    }\n  }\n}\n\n\n/**\n * Handles the {@link module:ol/MapBrowserEvent map browser event} (if it was a\n * mousewheel-event) and eventually zooms the map.\n * @param {module:ol/MapBrowserEvent} mapBrowserEvent Map browser event.\n * @return {boolean} Allow event propagation.\n * @this {module:ol/interaction/MouseWheelZoom}\n */\nfunction handleEvent(mapBrowserEvent) {\n  if (!this.condition_(mapBrowserEvent)) {\n    return true;\n  }\n  const type = mapBrowserEvent.type;\n  if (type !== EventType.WHEEL && type !== EventType.MOUSEWHEEL) {\n    return true;\n  }\n\n  mapBrowserEvent.preventDefault();\n\n  const map = mapBrowserEvent.map;\n  const wheelEvent = /** @type {WheelEvent} */ (mapBrowserEvent.originalEvent);\n\n  if (this.useAnchor_) {\n    this.lastAnchor_ = mapBrowserEvent.coordinate;\n  }\n\n  // Delta normalisation inspired by\n  // https://github.com/mapbox/mapbox-gl-js/blob/001c7b9/js/ui/handler/scroll_zoom.js\n  let delta;\n  if (mapBrowserEvent.type == EventType.WHEEL) {\n    delta = wheelEvent.deltaY;\n    if (FIREFOX &&\n        wheelEvent.deltaMode === WheelEvent.DOM_DELTA_PIXEL) {\n      delta /= DEVICE_PIXEL_RATIO;\n    }\n    if (wheelEvent.deltaMode === WheelEvent.DOM_DELTA_LINE) {\n      delta *= 40;\n    }\n  } else if (mapBrowserEvent.type == EventType.MOUSEWHEEL) {\n    delta = -wheelEvent.wheelDeltaY;\n    if (SAFARI) {\n      delta /= 3;\n    }\n  }\n\n  if (delta === 0) {\n    return false;\n  }\n\n  const now = Date.now();\n\n  if (this.startTime_ === undefined) {\n    this.startTime_ = now;\n  }\n\n  if (!this.mode_ || now - this.startTime_ > this.trackpadEventGap_) {\n    this.mode_ = Math.abs(delta) < 4 ?\n      Mode.TRACKPAD :\n      Mode.WHEEL;\n  }\n\n  if (this.mode_ === Mode.TRACKPAD) {\n    const view = map.getView();\n    if (this.trackpadTimeoutId_) {\n      clearTimeout(this.trackpadTimeoutId_);\n    } else {\n      view.setHint(ViewHint.INTERACTING, 1);\n    }\n    this.trackpadTimeoutId_ = setTimeout(this.decrementInteractingHint_.bind(this), this.trackpadEventGap_);\n    let resolution = view.getResolution() * Math.pow(2, delta / this.trackpadDeltaPerZoom_);\n    const minResolution = view.getMinResolution();\n    const maxResolution = view.getMaxResolution();\n    let rebound = 0;\n    if (resolution < minResolution) {\n      resolution = Math.max(resolution, minResolution / this.trackpadZoomBuffer_);\n      rebound = 1;\n    } else if (resolution > maxResolution) {\n      resolution = Math.min(resolution, maxResolution * this.trackpadZoomBuffer_);\n      rebound = -1;\n    }\n    if (this.lastAnchor_) {\n      const center = view.calculateCenterZoom(resolution, this.lastAnchor_);\n      view.setCenter(view.constrainCenter(center));\n    }\n    view.setResolution(resolution);\n\n    if (rebound === 0 && this.constrainResolution_) {\n      view.animate({\n        resolution: view.constrainResolution(resolution, delta > 0 ? -1 : 1),\n        easing: easeOut,\n        anchor: this.lastAnchor_,\n        duration: this.duration_\n      });\n    }\n\n    if (rebound > 0) {\n      view.animate({\n        resolution: minResolution,\n        easing: easeOut,\n        anchor: this.lastAnchor_,\n        duration: 500\n      });\n    } else if (rebound < 0) {\n      view.animate({\n        resolution: maxResolution,\n        easing: easeOut,\n        anchor: this.lastAnchor_,\n        duration: 500\n      });\n    }\n    this.startTime_ = now;\n    return false;\n  }\n\n  this.delta_ += delta;\n\n  const timeLeft = Math.max(this.timeout_ - (now - this.startTime_), 0);\n\n  clearTimeout(this.timeoutId_);\n  this.timeoutId_ = setTimeout(this.handleWheelZoom_.bind(this, map), timeLeft);\n\n  return false;\n}\n\n\nexport default MouseWheelZoom;\n","/**\n * @module ol/interaction/PinchRotate\n */\nimport ViewHint from '../ViewHint.js';\nimport {FALSE} from '../functions.js';\nimport {rotate, rotateWithoutConstraints} from '../interaction/Interaction.js';\nimport PointerInteraction, {centroid as centroidFromPointers} from '../interaction/Pointer.js';\nimport {disable} from '../rotationconstraint.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [duration=250] The duration of the animation in\n * milliseconds.\n * @property {number} [threshold=0.3] Minimal angle in radians to start a rotation.\n */\n\n\n/**\n * @classdesc\n * Allows the user to rotate the map by twisting with two fingers\n * on a touch screen.\n * @api\n */\nclass PinchRotate extends PointerInteraction {\n  /**\n   * @param {module:ol/interaction/PinchRotate~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    super({\n      handleDownEvent: handleDownEvent,\n      handleDragEvent: handleDragEvent,\n      handleUpEvent: handleUpEvent,\n      stopDown: FALSE\n    });\n\n    const options = opt_options || {};\n\n    /**\n     * @private\n     * @type {module:ol/coordinate~Coordinate}\n     */\n    this.anchor_ = null;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.lastAngle_ = undefined;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.rotating_ = false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.rotationDelta_ = 0.0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.threshold_ = options.threshold !== undefined ? options.threshold : 0.3;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 250;\n\n  }\n\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @this {module:ol/interaction/PinchRotate}\n */\nfunction handleDragEvent(mapBrowserEvent) {\n  let rotationDelta = 0.0;\n\n  const touch0 = this.targetPointers[0];\n  const touch1 = this.targetPointers[1];\n\n  // angle between touches\n  const angle = Math.atan2(\n    touch1.clientY - touch0.clientY,\n    touch1.clientX - touch0.clientX);\n\n  if (this.lastAngle_ !== undefined) {\n    const delta = angle - this.lastAngle_;\n    this.rotationDelta_ += delta;\n    if (!this.rotating_ &&\n        Math.abs(this.rotationDelta_) > this.threshold_) {\n      this.rotating_ = true;\n    }\n    rotationDelta = delta;\n  }\n  this.lastAngle_ = angle;\n\n  const map = mapBrowserEvent.map;\n  const view = map.getView();\n  if (view.getConstraints().rotation === disable) {\n    return;\n  }\n\n  // rotate anchor point.\n  // FIXME: should be the intersection point between the lines:\n  //     touch0,touch1 and previousTouch0,previousTouch1\n  const viewportPosition = map.getViewport().getBoundingClientRect();\n  const centroid = centroidFromPointers(this.targetPointers);\n  centroid[0] -= viewportPosition.left;\n  centroid[1] -= viewportPosition.top;\n  this.anchor_ = map.getCoordinateFromPixel(centroid);\n\n  // rotate\n  if (this.rotating_) {\n    const rotation = view.getRotation();\n    map.render();\n    rotateWithoutConstraints(view, rotation + rotationDelta, this.anchor_);\n  }\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Stop drag sequence?\n * @this {module:ol/interaction/PinchRotate}\n */\nfunction handleUpEvent(mapBrowserEvent) {\n  if (this.targetPointers.length < 2) {\n    const map = mapBrowserEvent.map;\n    const view = map.getView();\n    view.setHint(ViewHint.INTERACTING, -1);\n    if (this.rotating_) {\n      const rotation = view.getRotation();\n      rotate(view, rotation, this.anchor_, this.duration_);\n    }\n    return false;\n  } else {\n    return true;\n  }\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Start drag sequence?\n * @this {module:ol/interaction/PinchRotate}\n */\nfunction handleDownEvent(mapBrowserEvent) {\n  if (this.targetPointers.length >= 2) {\n    const map = mapBrowserEvent.map;\n    this.anchor_ = null;\n    this.lastAngle_ = undefined;\n    this.rotating_ = false;\n    this.rotationDelta_ = 0.0;\n    if (!this.handlingDownUpSequence) {\n      map.getView().setHint(ViewHint.INTERACTING, 1);\n    }\n    return true;\n  } else {\n    return false;\n  }\n}\n\nexport default PinchRotate;\n","/**\n * @module ol/interaction/PinchZoom\n */\nimport ViewHint from '../ViewHint.js';\nimport {FALSE} from '../functions.js';\nimport {zoom, zoomWithoutConstraints} from '../interaction/Interaction.js';\nimport PointerInteraction, {centroid as centroidFromPointers} from '../interaction/Pointer.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [duration=400] Animation duration in milliseconds.\n * @property {boolean} [constrainResolution=false] Zoom to the closest integer\n * zoom level after the pinch gesture ends.\n */\n\n\n/**\n * @classdesc\n * Allows the user to zoom the map by pinching with two fingers\n * on a touch screen.\n * @api\n */\nclass PinchZoom extends PointerInteraction {\n  /**\n   * @param {module:ol/interaction/PinchZoom~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    super({\n      handleDownEvent: handleDownEvent,\n      handleDragEvent: handleDragEvent,\n      handleUpEvent: handleUpEvent,\n      stopDown: FALSE\n    });\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.constrainResolution_ = options.constrainResolution || false;\n\n    /**\n     * @private\n     * @type {module:ol/coordinate~Coordinate}\n     */\n    this.anchor_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 400;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.lastDistance_ = undefined;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.lastScaleDelta_ = 1;\n\n  }\n\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @this {module:ol/interaction/PinchZoom}\n */\nfunction handleDragEvent(mapBrowserEvent) {\n  let scaleDelta = 1.0;\n\n  const touch0 = this.targetPointers[0];\n  const touch1 = this.targetPointers[1];\n  const dx = touch0.clientX - touch1.clientX;\n  const dy = touch0.clientY - touch1.clientY;\n\n  // distance between touches\n  const distance = Math.sqrt(dx * dx + dy * dy);\n\n  if (this.lastDistance_ !== undefined) {\n    scaleDelta = this.lastDistance_ / distance;\n  }\n  this.lastDistance_ = distance;\n\n\n  const map = mapBrowserEvent.map;\n  const view = map.getView();\n  const resolution = view.getResolution();\n  const maxResolution = view.getMaxResolution();\n  const minResolution = view.getMinResolution();\n  let newResolution = resolution * scaleDelta;\n  if (newResolution > maxResolution) {\n    scaleDelta = maxResolution / resolution;\n    newResolution = maxResolution;\n  } else if (newResolution < minResolution) {\n    scaleDelta = minResolution / resolution;\n    newResolution = minResolution;\n  }\n\n  if (scaleDelta != 1.0) {\n    this.lastScaleDelta_ = scaleDelta;\n  }\n\n  // scale anchor point.\n  const viewportPosition = map.getViewport().getBoundingClientRect();\n  const centroid = centroidFromPointers(this.targetPointers);\n  centroid[0] -= viewportPosition.left;\n  centroid[1] -= viewportPosition.top;\n  this.anchor_ = map.getCoordinateFromPixel(centroid);\n\n  // scale, bypass the resolution constraint\n  map.render();\n  zoomWithoutConstraints(view, newResolution, this.anchor_);\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Stop drag sequence?\n * @this {module:ol/interaction/PinchZoom}\n */\nfunction handleUpEvent(mapBrowserEvent) {\n  if (this.targetPointers.length < 2) {\n    const map = mapBrowserEvent.map;\n    const view = map.getView();\n    view.setHint(ViewHint.INTERACTING, -1);\n    const resolution = view.getResolution();\n    if (this.constrainResolution_ ||\n        resolution < view.getMinResolution() ||\n        resolution > view.getMaxResolution()) {\n      // Zoom to final resolution, with an animation, and provide a\n      // direction not to zoom out/in if user was pinching in/out.\n      // Direction is > 0 if pinching out, and < 0 if pinching in.\n      const direction = this.lastScaleDelta_ - 1;\n      zoom(view, resolution, this.anchor_, this.duration_, direction);\n    }\n    return false;\n  } else {\n    return true;\n  }\n}\n\n\n/**\n * @param {module:ol/MapBrowserPointerEvent} mapBrowserEvent Event.\n * @return {boolean} Start drag sequence?\n * @this {module:ol/interaction/PinchZoom}\n */\nfunction handleDownEvent(mapBrowserEvent) {\n  if (this.targetPointers.length >= 2) {\n    const map = mapBrowserEvent.map;\n    this.anchor_ = null;\n    this.lastDistance_ = undefined;\n    this.lastScaleDelta_ = 1;\n    if (!this.handlingDownUpSequence) {\n      map.getView().setHint(ViewHint.INTERACTING, 1);\n    }\n    return true;\n  } else {\n    return false;\n  }\n}\n\nexport default PinchZoom;\n","/**\n * @module ol/ImageBase\n */\nimport EventTarget from './events/Target.js';\nimport EventType from './events/EventType.js';\n\n/**\n * @abstract\n */\nclass ImageBase extends EventTarget {\n\n  /**\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {number|undefined} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {module:ol/ImageState} state State.\n   */\n  constructor(extent, resolution, pixelRatio, state) {\n\n    super();\n\n    /**\n     * @protected\n     * @type {module:ol/extent~Extent}\n     */\n    this.extent = extent;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.pixelRatio_ = pixelRatio;\n\n    /**\n     * @protected\n     * @type {number|undefined}\n     */\n    this.resolution = resolution;\n\n    /**\n     * @protected\n     * @type {module:ol/ImageState}\n     */\n    this.state = state;\n\n  }\n\n  /**\n   * @protected\n   */\n  changed() {\n    this.dispatchEvent(EventType.CHANGE);\n  }\n\n  /**\n   * @return {module:ol/extent~Extent} Extent.\n   */\n  getExtent() {\n    return this.extent;\n  }\n\n  /**\n   * @abstract\n   * @return {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} Image.\n   */\n  getImage() {}\n\n  /**\n   * @return {number} PixelRatio.\n   */\n  getPixelRatio() {\n    return this.pixelRatio_;\n  }\n\n  /**\n   * @return {number} Resolution.\n   */\n  getResolution() {\n    return /** @type {number} */ (this.resolution);\n  }\n\n  /**\n   * @return {module:ol/ImageState} State.\n   */\n  getState() {\n    return this.state;\n  }\n\n  /**\n   * Load not yet loaded URI.\n   * @abstract\n   */\n  load() {}\n}\n\n\nexport default ImageBase;\n","/**\n * @module ol/ImageCanvas\n */\nimport ImageBase from './ImageBase.js';\nimport ImageState from './ImageState.js';\n\n\n/**\n * A function that is called to trigger asynchronous canvas drawing.  It is\n * called with a \"done\" callback that should be called when drawing is done.\n * If any error occurs during drawing, the \"done\" callback should be called with\n * that error.\n *\n * @typedef {function(function(Error))} Loader\n */\n\n\nclass ImageCanvas extends ImageBase {\n\n  /**\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {HTMLCanvasElement} canvas Canvas.\n   * @param {module:ol/ImageCanvas~Loader=} opt_loader Optional loader function to\n   *     support asynchronous canvas drawing.\n   */\n  constructor(extent, resolution, pixelRatio, canvas, opt_loader) {\n\n    const state = opt_loader !== undefined ? ImageState.IDLE : ImageState.LOADED;\n\n    super(extent, resolution, pixelRatio, state);\n\n    /**\n     * Optional canvas loader function.\n     * @type {?module:ol/ImageCanvas~Loader}\n     * @private\n     */\n    this.loader_ = opt_loader !== undefined ? opt_loader : null;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement}\n     */\n    this.canvas_ = canvas;\n\n    /**\n     * @private\n     * @type {Error}\n     */\n    this.error_ = null;\n\n  }\n\n  /**\n   * Get any error associated with asynchronous rendering.\n   * @return {Error} Any error that occurred during rendering.\n   */\n  getError() {\n    return this.error_;\n  }\n\n  /**\n   * Handle async drawing complete.\n   * @param {Error} err Any error during drawing.\n   * @private\n   */\n  handleLoad_(err) {\n    if (err) {\n      this.error_ = err;\n      this.state = ImageState.ERROR;\n    } else {\n      this.state = ImageState.LOADED;\n    }\n    this.changed();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  load() {\n    if (this.state == ImageState.IDLE) {\n      this.state = ImageState.LOADING;\n      this.changed();\n      this.loader_(this.handleLoad_.bind(this));\n    }\n  }\n\n  /**\n   * @return {HTMLCanvasElement} Canvas element.\n   */\n  getImage() {\n    return this.canvas_;\n  }\n}\n\n\nexport default ImageCanvas;\n","/**\n * @module ol/render/Event\n */\n\nimport Event from '../events/Event.js';\n\nclass RenderEvent extends Event {\n\n  /**\n   * @param {module:ol/render/EventType} type Type.\n   * @param {module:ol/render/VectorContext=} opt_vectorContext Vector context.\n   * @param {module:ol/PluggableMap~FrameState=} opt_frameState Frame state.\n   * @param {?CanvasRenderingContext2D=} opt_context Context.\n   * @param {?module:ol/webgl/Context=} opt_glContext WebGL Context.\n   */\n  constructor(type, opt_vectorContext, opt_frameState, opt_context, opt_glContext) {\n\n    super(type);\n\n    /**\n     * For canvas, this is an instance of {@link module:ol/render/canvas/Immediate}.\n     * @type {module:ol/render/VectorContext|undefined}\n     * @api\n     */\n    this.vectorContext = opt_vectorContext;\n\n    /**\n     * An object representing the current render frame state.\n     * @type {module:ol/PluggableMap~FrameState|undefined}\n     * @api\n     */\n    this.frameState = opt_frameState;\n\n    /**\n     * Canvas context. Only available when a Canvas renderer is used, null\n     * otherwise.\n     * @type {CanvasRenderingContext2D|null|undefined}\n     * @api\n     */\n    this.context = opt_context;\n\n    /**\n     * WebGL context. Only available when a WebGL renderer is used, null\n     * otherwise.\n     * @type {module:ol/webgl/Context|null|undefined}\n     * @api\n     */\n    this.glContext = opt_glContext;\n\n  }\n\n}\n\nexport default RenderEvent;\n","/**\n * @module ol/render/VectorContext\n */\n\n/**\n * @classdesc\n * Context for drawing geometries.  A vector context is available on render\n * events and does not need to be constructed directly.\n * @api\n */\nclass VectorContext {\n  /**\n   * Render a geometry with a custom renderer.\n   *\n   * @param {module:ol/geom/SimpleGeometry} geometry Geometry.\n   * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n   * @param {Function} renderer Renderer.\n   */\n  drawCustom(geometry, feature, renderer) {}\n\n  /**\n   * Render a geometry.\n   *\n   * @param {module:ol/geom/Geometry} geometry The geometry to render.\n   */\n  drawGeometry(geometry) {}\n\n  /**\n   * Set the rendering style.\n   *\n   * @param {module:ol/style/Style} style The rendering style.\n   */\n  setStyle(style) {}\n\n  /**\n   * @param {module:ol/geom/Circle} circleGeometry Circle geometry.\n   * @param {module:ol/Feature} feature Feature.\n   */\n  drawCircle(circleGeometry, feature) {}\n\n  /**\n   * @param {module:ol/Feature} feature Feature.\n   * @param {module:ol/style/Style} style Style.\n   */\n  drawFeature(feature, style) {}\n\n  /**\n   * @param {module:ol/geom/GeometryCollection} geometryCollectionGeometry Geometry collection.\n   * @param {module:ol/Feature} feature Feature.\n   */\n  drawGeometryCollection(geometryCollectionGeometry, feature) {}\n\n  /**\n   * @param {module:ol/geom/LineString|module:ol/render/Feature} lineStringGeometry Line string geometry.\n   * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n   */\n  drawLineString(lineStringGeometry, feature) {}\n\n  /**\n   * @param {module:ol/geom/MultiLineString|module:ol/render/Feature} multiLineStringGeometry MultiLineString geometry.\n   * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n   */\n  drawMultiLineString(multiLineStringGeometry, feature) {}\n\n  /**\n   * @param {module:ol/geom/MultiPoint|module:ol/render/Feature} multiPointGeometry MultiPoint geometry.\n   * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n   */\n  drawMultiPoint(multiPointGeometry, feature) {}\n\n  /**\n   * @param {module:ol/geom/MultiPolygon} multiPolygonGeometry MultiPolygon geometry.\n   * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n   */\n  drawMultiPolygon(multiPolygonGeometry, feature) {}\n\n  /**\n   * @param {module:ol/geom/Point|module:ol/render/Feature} pointGeometry Point geometry.\n   * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n   */\n  drawPoint(pointGeometry, feature) {}\n\n  /**\n   * @param {module:ol/geom/Polygon|module:ol/render/Feature} polygonGeometry Polygon geometry.\n   * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n   */\n  drawPolygon(polygonGeometry, feature) {}\n\n  /**\n   * @param {module:ol/geom/Geometry|module:ol/render/Feature} geometry Geometry.\n   * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n   */\n  drawText(geometry, feature) {}\n\n  /**\n   * @param {module:ol/style/Fill} fillStyle Fill style.\n   * @param {module:ol/style/Stroke} strokeStyle Stroke style.\n   */\n  setFillStrokeStyle(fillStyle, strokeStyle) {}\n\n  /**\n   * @param {module:ol/style/Image} imageStyle Image style.\n   * @param {module:ol/render/canvas~DeclutterGroup=} opt_declutterGroup Declutter.\n   */\n  setImageStyle(imageStyle, opt_declutterGroup) {}\n\n  /**\n   * @param {module:ol/style/Text} textStyle Text style.\n   * @param {module:ol/render/canvas~DeclutterGroup=} opt_declutterGroup Declutter.\n   */\n  setTextStyle(textStyle, opt_declutterGroup) {}\n}\n\nexport default VectorContext;\n","/**\n * @module ol/render/canvas/Immediate\n */\n// FIXME test, especially polygons with holes and multipolygons\n// FIXME need to handle large thick features (where pixel size matters)\n// FIXME add offset and end to ol/geom/flat/transform~transform2D?\n\nimport {equals} from '../../array.js';\nimport {asColorLike} from '../../colorlike.js';\nimport {intersects} from '../../extent.js';\nimport GeometryType from '../../geom/GeometryType.js';\nimport {transformGeom2D} from '../../geom/SimpleGeometry.js';\nimport {transform2D} from '../../geom/flat/transform.js';\nimport {CANVAS_LINE_DASH} from '../../has.js';\nimport VectorContext from '../VectorContext.js';\nimport {defaultTextAlign, defaultFillStyle, defaultLineCap, defaultLineDash, defaultLineDashOffset, defaultLineJoin, defaultLineWidth, defaultMiterLimit, defaultStrokeStyle, defaultTextBaseline, defaultFont} from '../canvas.js';\nimport {create as createTransform, compose as composeTransform} from '../../transform.js';\n\n/**\n * @classdesc\n * A concrete subclass of {@link module:ol/render/VectorContext} that implements\n * direct rendering of features and geometries to an HTML5 Canvas context.\n * Instances of this class are created internally by the library and\n * provided to application code as vectorContext member of the\n * {@link module:ol/render/Event~RenderEvent} object associated with postcompose, precompose and\n * render events emitted by layers and maps.\n */\nclass CanvasImmediateRenderer extends VectorContext {\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {module:ol/transform~Transform} transform Transform.\n   * @param {number} viewRotation View rotation.\n   */\n  constructor(context, pixelRatio, extent, transform, viewRotation) {\n    super();\n\n    /**\n     * @private\n     * @type {CanvasRenderingContext2D}\n     */\n    this.context_ = context;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.pixelRatio_ = pixelRatio;\n\n    /**\n     * @private\n     * @type {module:ol/extent~Extent}\n     */\n    this.extent_ = extent;\n\n    /**\n     * @private\n     * @type {module:ol/transform~Transform}\n     */\n    this.transform_ = transform;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.viewRotation_ = viewRotation;\n\n    /**\n     * @private\n     * @type {?module:ol/render/canvas~FillState}\n     */\n    this.contextFillState_ = null;\n\n    /**\n     * @private\n     * @type {?module:ol/render/canvas~StrokeState}\n     */\n    this.contextStrokeState_ = null;\n\n    /**\n     * @private\n     * @type {?module:ol/render/canvas~TextState}\n     */\n    this.contextTextState_ = null;\n\n    /**\n     * @private\n     * @type {?module:ol/render/canvas~FillState}\n     */\n    this.fillState_ = null;\n\n    /**\n     * @private\n     * @type {?module:ol/render/canvas~StrokeState}\n     */\n    this.strokeState_ = null;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement}\n     */\n    this.image_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageAnchorX_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageAnchorY_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageHeight_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageOpacity_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageOriginX_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageOriginY_ = 0;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.imageRotateWithView_ = false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageRotation_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageScale_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageWidth_ = 0;\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.text_ = '';\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textOffsetX_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textOffsetY_ = 0;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.textRotateWithView_ = false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textRotation_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textScale_ = 0;\n\n    /**\n     * @private\n     * @type {?module:ol/render/canvas~FillState}\n     */\n    this.textFillState_ = null;\n\n    /**\n     * @private\n     * @type {?module:ol/render/canvas~StrokeState}\n     */\n    this.textStrokeState_ = null;\n\n    /**\n     * @private\n     * @type {?module:ol/render/canvas~TextState}\n     */\n    this.textState_ = null;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.pixelCoordinates_ = [];\n\n    /**\n     * @private\n     * @type {module:ol/transform~Transform}\n     */\n    this.tmpLocalTransform_ = createTransform();\n\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {number} end End.\n   * @param {number} stride Stride.\n   * @private\n   */\n  drawImages_(flatCoordinates, offset, end, stride) {\n    if (!this.image_) {\n      return;\n    }\n    const pixelCoordinates = transform2D(\n      flatCoordinates, offset, end, 2, this.transform_,\n      this.pixelCoordinates_);\n    const context = this.context_;\n    const localTransform = this.tmpLocalTransform_;\n    const alpha = context.globalAlpha;\n    if (this.imageOpacity_ != 1) {\n      context.globalAlpha = alpha * this.imageOpacity_;\n    }\n    let rotation = this.imageRotation_;\n    if (this.imageRotateWithView_) {\n      rotation += this.viewRotation_;\n    }\n    for (let i = 0, ii = pixelCoordinates.length; i < ii; i += 2) {\n      const x = pixelCoordinates[i] - this.imageAnchorX_;\n      const y = pixelCoordinates[i + 1] - this.imageAnchorY_;\n      if (rotation !== 0 || this.imageScale_ != 1) {\n        const centerX = x + this.imageAnchorX_;\n        const centerY = y + this.imageAnchorY_;\n        composeTransform(localTransform,\n          centerX, centerY,\n          this.imageScale_, this.imageScale_,\n          rotation,\n          -centerX, -centerY);\n        context.setTransform.apply(context, localTransform);\n      }\n      context.drawImage(this.image_, this.imageOriginX_, this.imageOriginY_,\n        this.imageWidth_, this.imageHeight_, x, y,\n        this.imageWidth_, this.imageHeight_);\n    }\n    if (rotation !== 0 || this.imageScale_ != 1) {\n      context.setTransform(1, 0, 0, 1, 0, 0);\n    }\n    if (this.imageOpacity_ != 1) {\n      context.globalAlpha = alpha;\n    }\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {number} end End.\n   * @param {number} stride Stride.\n   * @private\n   */\n  drawText_(flatCoordinates, offset, end, stride) {\n    if (!this.textState_ || this.text_ === '') {\n      return;\n    }\n    if (this.textFillState_) {\n      this.setContextFillState_(this.textFillState_);\n    }\n    if (this.textStrokeState_) {\n      this.setContextStrokeState_(this.textStrokeState_);\n    }\n    this.setContextTextState_(this.textState_);\n    const pixelCoordinates = transform2D(\n      flatCoordinates, offset, end, stride, this.transform_,\n      this.pixelCoordinates_);\n    const context = this.context_;\n    let rotation = this.textRotation_;\n    if (this.textRotateWithView_) {\n      rotation += this.viewRotation_;\n    }\n    for (; offset < end; offset += stride) {\n      const x = pixelCoordinates[offset] + this.textOffsetX_;\n      const y = pixelCoordinates[offset + 1] + this.textOffsetY_;\n      if (rotation !== 0 || this.textScale_ != 1) {\n        const localTransform = composeTransform(this.tmpLocalTransform_,\n          x, y,\n          this.textScale_, this.textScale_,\n          rotation,\n          -x, -y);\n        context.setTransform.apply(context, localTransform);\n      }\n      if (this.textStrokeState_) {\n        context.strokeText(this.text_, x, y);\n      }\n      if (this.textFillState_) {\n        context.fillText(this.text_, x, y);\n      }\n    }\n    if (rotation !== 0 || this.textScale_ != 1) {\n      context.setTransform(1, 0, 0, 1, 0, 0);\n    }\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {number} end End.\n   * @param {number} stride Stride.\n   * @param {boolean} close Close.\n   * @private\n   * @return {number} end End.\n   */\n  moveToLineTo_(flatCoordinates, offset, end, stride, close) {\n    const context = this.context_;\n    const pixelCoordinates = transform2D(\n      flatCoordinates, offset, end, stride, this.transform_,\n      this.pixelCoordinates_);\n    context.moveTo(pixelCoordinates[0], pixelCoordinates[1]);\n    let length = pixelCoordinates.length;\n    if (close) {\n      length -= 2;\n    }\n    for (let i = 2; i < length; i += 2) {\n      context.lineTo(pixelCoordinates[i], pixelCoordinates[i + 1]);\n    }\n    if (close) {\n      context.closePath();\n    }\n    return end;\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {Array<number>} ends Ends.\n   * @param {number} stride Stride.\n   * @private\n   * @return {number} End.\n   */\n  drawRings_(flatCoordinates, offset, ends, stride) {\n    for (let i = 0, ii = ends.length; i < ii; ++i) {\n      offset = this.moveToLineTo_(flatCoordinates, offset, ends[i], stride, true);\n    }\n    return offset;\n  }\n\n  /**\n   * Render a circle geometry into the canvas.  Rendering is immediate and uses\n   * the current fill and stroke styles.\n   *\n   * @param {module:ol/geom/Circle} geometry Circle geometry.\n   * @override\n   * @api\n   */\n  drawCircle(geometry) {\n    if (!intersects(this.extent_, geometry.getExtent())) {\n      return;\n    }\n    if (this.fillState_ || this.strokeState_) {\n      if (this.fillState_) {\n        this.setContextFillState_(this.fillState_);\n      }\n      if (this.strokeState_) {\n        this.setContextStrokeState_(this.strokeState_);\n      }\n      const pixelCoordinates = transformGeom2D(\n        geometry, this.transform_, this.pixelCoordinates_);\n      const dx = pixelCoordinates[2] - pixelCoordinates[0];\n      const dy = pixelCoordinates[3] - pixelCoordinates[1];\n      const radius = Math.sqrt(dx * dx + dy * dy);\n      const context = this.context_;\n      context.beginPath();\n      context.arc(\n        pixelCoordinates[0], pixelCoordinates[1], radius, 0, 2 * Math.PI);\n      if (this.fillState_) {\n        context.fill();\n      }\n      if (this.strokeState_) {\n        context.stroke();\n      }\n    }\n    if (this.text_ !== '') {\n      this.drawText_(geometry.getCenter(), 0, 2, 2);\n    }\n  }\n\n  /**\n   * Set the rendering style.  Note that since this is an immediate rendering API,\n   * any `zIndex` on the provided style will be ignored.\n   *\n   * @param {module:ol/style/Style} style The rendering style.\n   * @override\n   * @api\n   */\n  setStyle(style) {\n    this.setFillStrokeStyle(style.getFill(), style.getStroke());\n    this.setImageStyle(style.getImage());\n    this.setTextStyle(style.getText());\n  }\n\n  /**\n   * Render a geometry into the canvas.  Call\n   * {@link module:ol/render/canvas/Immediate#setStyle} first to set the rendering style.\n   *\n   * @param {module:ol/geom/Geometry|module:ol/render/Feature} geometry The geometry to render.\n   * @override\n   * @api\n   */\n  drawGeometry(geometry) {\n    const type = geometry.getType();\n    switch (type) {\n      case GeometryType.POINT:\n        this.drawPoint(/** @type {module:ol/geom/Point} */ (geometry));\n        break;\n      case GeometryType.LINE_STRING:\n        this.drawLineString(/** @type {module:ol/geom/LineString} */ (geometry));\n        break;\n      case GeometryType.POLYGON:\n        this.drawPolygon(/** @type {module:ol/geom/Polygon} */ (geometry));\n        break;\n      case GeometryType.MULTI_POINT:\n        this.drawMultiPoint(/** @type {module:ol/geom/MultiPoint} */ (geometry));\n        break;\n      case GeometryType.MULTI_LINE_STRING:\n        this.drawMultiLineString(/** @type {module:ol/geom/MultiLineString} */ (geometry));\n        break;\n      case GeometryType.MULTI_POLYGON:\n        this.drawMultiPolygon(/** @type {module:ol/geom/MultiPolygon} */ (geometry));\n        break;\n      case GeometryType.GEOMETRY_COLLECTION:\n        this.drawGeometryCollection(/** @type {module:ol/geom/GeometryCollection} */ (geometry));\n        break;\n      case GeometryType.CIRCLE:\n        this.drawCircle(/** @type {module:ol/geom/Circle} */ (geometry));\n        break;\n      default:\n    }\n  }\n\n  /**\n   * Render a feature into the canvas.  Note that any `zIndex` on the provided\n   * style will be ignored - features are rendered immediately in the order that\n   * this method is called.  If you need `zIndex` support, you should be using an\n   * {@link module:ol/layer/Vector~VectorLayer} instead.\n   *\n   * @param {module:ol/Feature} feature Feature.\n   * @param {module:ol/style/Style} style Style.\n   * @override\n   * @api\n   */\n  drawFeature(feature, style) {\n    const geometry = style.getGeometryFunction()(feature);\n    if (!geometry || !intersects(this.extent_, geometry.getExtent())) {\n      return;\n    }\n    this.setStyle(style);\n    this.drawGeometry(geometry);\n  }\n\n  /**\n   * Render a GeometryCollection to the canvas.  Rendering is immediate and\n   * uses the current styles appropriate for each geometry in the collection.\n   *\n   * @param {module:ol/geom/GeometryCollection} geometry Geometry collection.\n   * @override\n   */\n  drawGeometryCollection(geometry) {\n    const geometries = geometry.getGeometriesArray();\n    for (let i = 0, ii = geometries.length; i < ii; ++i) {\n      this.drawGeometry(geometries[i]);\n    }\n  }\n\n  /**\n   * Render a Point geometry into the canvas.  Rendering is immediate and uses\n   * the current style.\n   *\n   * @param {module:ol/geom/Point|module:ol/render/Feature} geometry Point geometry.\n   * @override\n   */\n  drawPoint(geometry) {\n    const flatCoordinates = geometry.getFlatCoordinates();\n    const stride = geometry.getStride();\n    if (this.image_) {\n      this.drawImages_(flatCoordinates, 0, flatCoordinates.length, stride);\n    }\n    if (this.text_ !== '') {\n      this.drawText_(flatCoordinates, 0, flatCoordinates.length, stride);\n    }\n  }\n\n  /**\n   * Render a MultiPoint geometry  into the canvas.  Rendering is immediate and\n   * uses the current style.\n   *\n   * @param {module:ol/geom/MultiPoint|module:ol/render/Feature} geometry MultiPoint geometry.\n   * @override\n   */\n  drawMultiPoint(geometry) {\n    const flatCoordinates = geometry.getFlatCoordinates();\n    const stride = geometry.getStride();\n    if (this.image_) {\n      this.drawImages_(flatCoordinates, 0, flatCoordinates.length, stride);\n    }\n    if (this.text_ !== '') {\n      this.drawText_(flatCoordinates, 0, flatCoordinates.length, stride);\n    }\n  }\n\n  /**\n   * Render a LineString into the canvas.  Rendering is immediate and uses\n   * the current style.\n   *\n   * @param {module:ol/geom/LineString|module:ol/render/Feature} geometry LineString geometry.\n   * @override\n   */\n  drawLineString(geometry) {\n    if (!intersects(this.extent_, geometry.getExtent())) {\n      return;\n    }\n    if (this.strokeState_) {\n      this.setContextStrokeState_(this.strokeState_);\n      const context = this.context_;\n      const flatCoordinates = geometry.getFlatCoordinates();\n      context.beginPath();\n      this.moveToLineTo_(flatCoordinates, 0, flatCoordinates.length,\n        geometry.getStride(), false);\n      context.stroke();\n    }\n    if (this.text_ !== '') {\n      const flatMidpoint = geometry.getFlatMidpoint();\n      this.drawText_(flatMidpoint, 0, 2, 2);\n    }\n  }\n\n  /**\n   * Render a MultiLineString geometry into the canvas.  Rendering is immediate\n   * and uses the current style.\n   *\n   * @param {module:ol/geom/MultiLineString|module:ol/render/Feature} geometry MultiLineString geometry.\n   * @override\n   */\n  drawMultiLineString(geometry) {\n    const geometryExtent = geometry.getExtent();\n    if (!intersects(this.extent_, geometryExtent)) {\n      return;\n    }\n    if (this.strokeState_) {\n      this.setContextStrokeState_(this.strokeState_);\n      const context = this.context_;\n      const flatCoordinates = geometry.getFlatCoordinates();\n      let offset = 0;\n      const ends = geometry.getEnds();\n      const stride = geometry.getStride();\n      context.beginPath();\n      for (let i = 0, ii = ends.length; i < ii; ++i) {\n        offset = this.moveToLineTo_(flatCoordinates, offset, ends[i], stride, false);\n      }\n      context.stroke();\n    }\n    if (this.text_ !== '') {\n      const flatMidpoints = geometry.getFlatMidpoints();\n      this.drawText_(flatMidpoints, 0, flatMidpoints.length, 2);\n    }\n  }\n\n  /**\n   * Render a Polygon geometry into the canvas.  Rendering is immediate and uses\n   * the current style.\n   *\n   * @param {module:ol/geom/Polygon|module:ol/render/Feature} geometry Polygon geometry.\n   * @override\n   */\n  drawPolygon(geometry) {\n    if (!intersects(this.extent_, geometry.getExtent())) {\n      return;\n    }\n    if (this.strokeState_ || this.fillState_) {\n      if (this.fillState_) {\n        this.setContextFillState_(this.fillState_);\n      }\n      if (this.strokeState_) {\n        this.setContextStrokeState_(this.strokeState_);\n      }\n      const context = this.context_;\n      context.beginPath();\n      this.drawRings_(geometry.getOrientedFlatCoordinates(),\n        0, geometry.getEnds(), geometry.getStride());\n      if (this.fillState_) {\n        context.fill();\n      }\n      if (this.strokeState_) {\n        context.stroke();\n      }\n    }\n    if (this.text_ !== '') {\n      const flatInteriorPoint = geometry.getFlatInteriorPoint();\n      this.drawText_(flatInteriorPoint, 0, 2, 2);\n    }\n  }\n\n  /**\n   * Render MultiPolygon geometry into the canvas.  Rendering is immediate and\n   * uses the current style.\n   * @param {module:ol/geom/MultiPolygon} geometry MultiPolygon geometry.\n   * @override\n   */\n  drawMultiPolygon(geometry) {\n    if (!intersects(this.extent_, geometry.getExtent())) {\n      return;\n    }\n    if (this.strokeState_ || this.fillState_) {\n      if (this.fillState_) {\n        this.setContextFillState_(this.fillState_);\n      }\n      if (this.strokeState_) {\n        this.setContextStrokeState_(this.strokeState_);\n      }\n      const context = this.context_;\n      const flatCoordinates = geometry.getOrientedFlatCoordinates();\n      let offset = 0;\n      const endss = geometry.getEndss();\n      const stride = geometry.getStride();\n      context.beginPath();\n      for (let i = 0, ii = endss.length; i < ii; ++i) {\n        const ends = endss[i];\n        offset = this.drawRings_(flatCoordinates, offset, ends, stride);\n      }\n      if (this.fillState_) {\n        context.fill();\n      }\n      if (this.strokeState_) {\n        context.stroke();\n      }\n    }\n    if (this.text_ !== '') {\n      const flatInteriorPoints = geometry.getFlatInteriorPoints();\n      this.drawText_(flatInteriorPoints, 0, flatInteriorPoints.length, 2);\n    }\n  }\n\n  /**\n   * @param {module:ol/render/canvas~FillState} fillState Fill state.\n   * @private\n   */\n  setContextFillState_(fillState) {\n    const context = this.context_;\n    const contextFillState = this.contextFillState_;\n    if (!contextFillState) {\n      context.fillStyle = fillState.fillStyle;\n      this.contextFillState_ = {\n        fillStyle: fillState.fillStyle\n      };\n    } else {\n      if (contextFillState.fillStyle != fillState.fillStyle) {\n        contextFillState.fillStyle = context.fillStyle = fillState.fillStyle;\n      }\n    }\n  }\n\n  /**\n   * @param {module:ol/render/canvas~StrokeState} strokeState Stroke state.\n   * @private\n   */\n  setContextStrokeState_(strokeState) {\n    const context = this.context_;\n    const contextStrokeState = this.contextStrokeState_;\n    if (!contextStrokeState) {\n      context.lineCap = strokeState.lineCap;\n      if (CANVAS_LINE_DASH) {\n        context.setLineDash(strokeState.lineDash);\n        context.lineDashOffset = strokeState.lineDashOffset;\n      }\n      context.lineJoin = strokeState.lineJoin;\n      context.lineWidth = strokeState.lineWidth;\n      context.miterLimit = strokeState.miterLimit;\n      context.strokeStyle = strokeState.strokeStyle;\n      this.contextStrokeState_ = {\n        lineCap: strokeState.lineCap,\n        lineDash: strokeState.lineDash,\n        lineDashOffset: strokeState.lineDashOffset,\n        lineJoin: strokeState.lineJoin,\n        lineWidth: strokeState.lineWidth,\n        miterLimit: strokeState.miterLimit,\n        strokeStyle: strokeState.strokeStyle\n      };\n    } else {\n      if (contextStrokeState.lineCap != strokeState.lineCap) {\n        contextStrokeState.lineCap = context.lineCap = strokeState.lineCap;\n      }\n      if (CANVAS_LINE_DASH) {\n        if (!equals(contextStrokeState.lineDash, strokeState.lineDash)) {\n          context.setLineDash(contextStrokeState.lineDash = strokeState.lineDash);\n        }\n        if (contextStrokeState.lineDashOffset != strokeState.lineDashOffset) {\n          contextStrokeState.lineDashOffset = context.lineDashOffset =\n              strokeState.lineDashOffset;\n        }\n      }\n      if (contextStrokeState.lineJoin != strokeState.lineJoin) {\n        contextStrokeState.lineJoin = context.lineJoin = strokeState.lineJoin;\n      }\n      if (contextStrokeState.lineWidth != strokeState.lineWidth) {\n        contextStrokeState.lineWidth = context.lineWidth = strokeState.lineWidth;\n      }\n      if (contextStrokeState.miterLimit != strokeState.miterLimit) {\n        contextStrokeState.miterLimit = context.miterLimit =\n            strokeState.miterLimit;\n      }\n      if (contextStrokeState.strokeStyle != strokeState.strokeStyle) {\n        contextStrokeState.strokeStyle = context.strokeStyle =\n            strokeState.strokeStyle;\n      }\n    }\n  }\n\n  /**\n   * @param {module:ol/render/canvas~TextState} textState Text state.\n   * @private\n   */\n  setContextTextState_(textState) {\n    const context = this.context_;\n    const contextTextState = this.contextTextState_;\n    const textAlign = textState.textAlign ?\n      textState.textAlign : defaultTextAlign;\n    if (!contextTextState) {\n      context.font = textState.font;\n      context.textAlign = textAlign;\n      context.textBaseline = textState.textBaseline;\n      this.contextTextState_ = {\n        font: textState.font,\n        textAlign: textAlign,\n        textBaseline: textState.textBaseline\n      };\n    } else {\n      if (contextTextState.font != textState.font) {\n        contextTextState.font = context.font = textState.font;\n      }\n      if (contextTextState.textAlign != textAlign) {\n        contextTextState.textAlign = context.textAlign = textAlign;\n      }\n      if (contextTextState.textBaseline != textState.textBaseline) {\n        contextTextState.textBaseline = context.textBaseline =\n            textState.textBaseline;\n      }\n    }\n  }\n\n  /**\n   * Set the fill and stroke style for subsequent draw operations.  To clear\n   * either fill or stroke styles, pass null for the appropriate parameter.\n   *\n   * @param {module:ol/style/Fill} fillStyle Fill style.\n   * @param {module:ol/style/Stroke} strokeStyle Stroke style.\n   * @override\n   */\n  setFillStrokeStyle(fillStyle, strokeStyle) {\n    if (!fillStyle) {\n      this.fillState_ = null;\n    } else {\n      const fillStyleColor = fillStyle.getColor();\n      this.fillState_ = {\n        fillStyle: asColorLike(fillStyleColor ?\n          fillStyleColor : defaultFillStyle)\n      };\n    }\n    if (!strokeStyle) {\n      this.strokeState_ = null;\n    } else {\n      const strokeStyleColor = strokeStyle.getColor();\n      const strokeStyleLineCap = strokeStyle.getLineCap();\n      const strokeStyleLineDash = strokeStyle.getLineDash();\n      const strokeStyleLineDashOffset = strokeStyle.getLineDashOffset();\n      const strokeStyleLineJoin = strokeStyle.getLineJoin();\n      const strokeStyleWidth = strokeStyle.getWidth();\n      const strokeStyleMiterLimit = strokeStyle.getMiterLimit();\n      this.strokeState_ = {\n        lineCap: strokeStyleLineCap !== undefined ?\n          strokeStyleLineCap : defaultLineCap,\n        lineDash: strokeStyleLineDash ?\n          strokeStyleLineDash : defaultLineDash,\n        lineDashOffset: strokeStyleLineDashOffset ?\n          strokeStyleLineDashOffset : defaultLineDashOffset,\n        lineJoin: strokeStyleLineJoin !== undefined ?\n          strokeStyleLineJoin : defaultLineJoin,\n        lineWidth: this.pixelRatio_ * (strokeStyleWidth !== undefined ?\n          strokeStyleWidth : defaultLineWidth),\n        miterLimit: strokeStyleMiterLimit !== undefined ?\n          strokeStyleMiterLimit : defaultMiterLimit,\n        strokeStyle: asColorLike(strokeStyleColor ?\n          strokeStyleColor : defaultStrokeStyle)\n      };\n    }\n  }\n\n  /**\n   * Set the image style for subsequent draw operations.  Pass null to remove\n   * the image style.\n   *\n   * @param {module:ol/style/Image} imageStyle Image style.\n   * @override\n   */\n  setImageStyle(imageStyle) {\n    if (!imageStyle) {\n      this.image_ = null;\n    } else {\n      const imageAnchor = imageStyle.getAnchor();\n      // FIXME pixel ratio\n      const imageImage = imageStyle.getImage(1);\n      const imageOrigin = imageStyle.getOrigin();\n      const imageSize = imageStyle.getSize();\n      this.imageAnchorX_ = imageAnchor[0];\n      this.imageAnchorY_ = imageAnchor[1];\n      this.imageHeight_ = imageSize[1];\n      this.image_ = imageImage;\n      this.imageOpacity_ = imageStyle.getOpacity();\n      this.imageOriginX_ = imageOrigin[0];\n      this.imageOriginY_ = imageOrigin[1];\n      this.imageRotateWithView_ = imageStyle.getRotateWithView();\n      this.imageRotation_ = imageStyle.getRotation();\n      this.imageScale_ = imageStyle.getScale() * this.pixelRatio_;\n      this.imageWidth_ = imageSize[0];\n    }\n  }\n\n  /**\n   * Set the text style for subsequent draw operations.  Pass null to\n   * remove the text style.\n   *\n   * @param {module:ol/style/Text} textStyle Text style.\n   * @override\n   */\n  setTextStyle(textStyle) {\n    if (!textStyle) {\n      this.text_ = '';\n    } else {\n      const textFillStyle = textStyle.getFill();\n      if (!textFillStyle) {\n        this.textFillState_ = null;\n      } else {\n        const textFillStyleColor = textFillStyle.getColor();\n        this.textFillState_ = {\n          fillStyle: asColorLike(textFillStyleColor ?\n            textFillStyleColor : defaultFillStyle)\n        };\n      }\n      const textStrokeStyle = textStyle.getStroke();\n      if (!textStrokeStyle) {\n        this.textStrokeState_ = null;\n      } else {\n        const textStrokeStyleColor = textStrokeStyle.getColor();\n        const textStrokeStyleLineCap = textStrokeStyle.getLineCap();\n        const textStrokeStyleLineDash = textStrokeStyle.getLineDash();\n        const textStrokeStyleLineDashOffset = textStrokeStyle.getLineDashOffset();\n        const textStrokeStyleLineJoin = textStrokeStyle.getLineJoin();\n        const textStrokeStyleWidth = textStrokeStyle.getWidth();\n        const textStrokeStyleMiterLimit = textStrokeStyle.getMiterLimit();\n        this.textStrokeState_ = {\n          lineCap: textStrokeStyleLineCap !== undefined ?\n            textStrokeStyleLineCap : defaultLineCap,\n          lineDash: textStrokeStyleLineDash ?\n            textStrokeStyleLineDash : defaultLineDash,\n          lineDashOffset: textStrokeStyleLineDashOffset ?\n            textStrokeStyleLineDashOffset : defaultLineDashOffset,\n          lineJoin: textStrokeStyleLineJoin !== undefined ?\n            textStrokeStyleLineJoin : defaultLineJoin,\n          lineWidth: textStrokeStyleWidth !== undefined ?\n            textStrokeStyleWidth : defaultLineWidth,\n          miterLimit: textStrokeStyleMiterLimit !== undefined ?\n            textStrokeStyleMiterLimit : defaultMiterLimit,\n          strokeStyle: asColorLike(textStrokeStyleColor ?\n            textStrokeStyleColor : defaultStrokeStyle)\n        };\n      }\n      const textFont = textStyle.getFont();\n      const textOffsetX = textStyle.getOffsetX();\n      const textOffsetY = textStyle.getOffsetY();\n      const textRotateWithView = textStyle.getRotateWithView();\n      const textRotation = textStyle.getRotation();\n      const textScale = textStyle.getScale();\n      const textText = textStyle.getText();\n      const textTextAlign = textStyle.getTextAlign();\n      const textTextBaseline = textStyle.getTextBaseline();\n      this.textState_ = {\n        font: textFont !== undefined ?\n          textFont : defaultFont,\n        textAlign: textTextAlign !== undefined ?\n          textTextAlign : defaultTextAlign,\n        textBaseline: textTextBaseline !== undefined ?\n          textTextBaseline : defaultTextBaseline\n      };\n      this.text_ = textText !== undefined ? textText : '';\n      this.textOffsetX_ =\n          textOffsetX !== undefined ? (this.pixelRatio_ * textOffsetX) : 0;\n      this.textOffsetY_ =\n          textOffsetY !== undefined ? (this.pixelRatio_ * textOffsetY) : 0;\n      this.textRotateWithView_ = textRotateWithView !== undefined ? textRotateWithView : false;\n      this.textRotation_ = textRotation !== undefined ? textRotation : 0;\n      this.textScale_ = this.pixelRatio_ * (textScale !== undefined ?\n        textScale : 1);\n    }\n  }\n}\n\n\nexport default CanvasImmediateRenderer;\n","/**\n * @module ol/renderer/Map\n */\nimport {getUid} from '../util.js';\nimport Disposable from '../Disposable.js';\nimport {listen, unlistenByKey} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {getWidth} from '../extent.js';\nimport {TRUE, VOID} from '../functions.js';\nimport {visibleAtResolution} from '../layer/Layer.js';\nimport {shared as iconImageCache} from '../style/IconImageCache.js';\nimport {compose as composeTransform, invert as invertTransform, setFromArray as transformSetFromArray} from '../transform.js';\n\n\nclass MapRenderer extends Disposable {\n\n  /**\n   * @param {module:ol/PluggableMap} map Map.\n   */\n  constructor(map) {\n    super();\n\n    /**\n     * @private\n     * @type {module:ol/PluggableMap}\n     */\n    this.map_ = map;\n\n    /**\n     * @private\n     * @type {!Object<string, module:ol/renderer/Layer>}\n     */\n    this.layerRenderers_ = {};\n\n    /**\n     * @private\n     * @type {Object<string, module:ol/events~EventsKey>}\n     */\n    this.layerRendererListeners_ = {};\n\n    /**\n     * @private\n     * @type {Array<module:ol/renderer/Layer>}\n     */\n    this.layerRendererConstructors_ = [];\n\n  }\n\n  /**\n   * Register layer renderer constructors.\n   * @param {Array<module:ol/renderer/Layer>} constructors Layer renderers.\n   */\n  registerLayerRenderers(constructors) {\n    this.layerRendererConstructors_.push.apply(this.layerRendererConstructors_, constructors);\n  }\n\n  /**\n   * Get the registered layer renderer constructors.\n   * @return {Array<module:ol/renderer/Layer>} Registered layer renderers.\n   */\n  getLayerRendererConstructors() {\n    return this.layerRendererConstructors_;\n  }\n\n  /**\n   * @param {module:ol/PluggableMap~FrameState} frameState FrameState.\n   * @protected\n   */\n  calculateMatrices2D(frameState) {\n    const viewState = frameState.viewState;\n    const coordinateToPixelTransform = frameState.coordinateToPixelTransform;\n    const pixelToCoordinateTransform = frameState.pixelToCoordinateTransform;\n\n    composeTransform(coordinateToPixelTransform,\n      frameState.size[0] / 2, frameState.size[1] / 2,\n      1 / viewState.resolution, -1 / viewState.resolution,\n      -viewState.rotation,\n      -viewState.center[0], -viewState.center[1]);\n\n    invertTransform(\n      transformSetFromArray(pixelToCoordinateTransform, coordinateToPixelTransform));\n  }\n\n  /**\n   * Removes all layer renderers.\n   */\n  removeLayerRenderers() {\n    for (const key in this.layerRenderers_) {\n      this.removeLayerRendererByKey_(key).dispose();\n    }\n  }\n\n  /**\n   * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n   * @param {module:ol/PluggableMap~FrameState} frameState FrameState.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @param {function(this: S, (module:ol/Feature|module:ol/render/Feature),\n   *     module:ol/layer/Layer): T} callback Feature callback.\n   * @param {S} thisArg Value to use as `this` when executing `callback`.\n   * @param {function(this: U, module:ol/layer/Layer): boolean} layerFilter Layer filter\n   *     function, only layers which are visible and for which this function\n   *     returns `true` will be tested for features.  By default, all visible\n   *     layers will be tested.\n   * @param {U} thisArg2 Value to use as `this` when executing `layerFilter`.\n   * @return {T|undefined} Callback result.\n   * @template S,T,U\n   */\n  forEachFeatureAtCoordinate(\n    coordinate,\n    frameState,\n    hitTolerance,\n    callback,\n    thisArg,\n    layerFilter,\n    thisArg2\n  ) {\n    let result;\n    const viewState = frameState.viewState;\n    const viewResolution = viewState.resolution;\n\n    /**\n     * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n     * @param {module:ol/layer/Layer} layer Layer.\n     * @return {?} Callback result.\n     */\n    function forEachFeatureAtCoordinate(feature, layer) {\n      const key = getUid(feature).toString();\n      const managed = frameState.layerStates[getUid(layer)].managed;\n      if (!(key in frameState.skippedFeatureUids && !managed)) {\n        return callback.call(thisArg, feature, managed ? layer : null);\n      }\n    }\n\n    const projection = viewState.projection;\n\n    let translatedCoordinate = coordinate;\n    if (projection.canWrapX()) {\n      const projectionExtent = projection.getExtent();\n      const worldWidth = getWidth(projectionExtent);\n      const x = coordinate[0];\n      if (x < projectionExtent[0] || x > projectionExtent[2]) {\n        const worldsAway = Math.ceil((projectionExtent[0] - x) / worldWidth);\n        translatedCoordinate = [x + worldWidth * worldsAway, coordinate[1]];\n      }\n    }\n\n    const layerStates = frameState.layerStatesArray;\n    const numLayers = layerStates.length;\n    let i;\n    for (i = numLayers - 1; i >= 0; --i) {\n      const layerState = layerStates[i];\n      const layer = layerState.layer;\n      if (visibleAtResolution(layerState, viewResolution) && layerFilter.call(thisArg2, layer)) {\n        const layerRenderer = this.getLayerRenderer(layer);\n        if (layer.getSource()) {\n          result = layerRenderer.forEachFeatureAtCoordinate(\n            layer.getSource().getWrapX() ? translatedCoordinate : coordinate,\n            frameState, hitTolerance, forEachFeatureAtCoordinate, thisArg);\n        }\n        if (result) {\n          return result;\n        }\n      }\n    }\n    return undefined;\n  }\n\n  /**\n   * @abstract\n   * @param {module:ol/pixel~Pixel} pixel Pixel.\n   * @param {module:ol/PluggableMap~FrameState} frameState FrameState.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @param {function(this: S, module:ol/layer/Layer, (Uint8ClampedArray|Uint8Array)): T} callback Layer\n   *     callback.\n   * @param {S} thisArg Value to use as `this` when executing `callback`.\n   * @param {function(this: U, module:ol/layer/Layer): boolean} layerFilter Layer filter\n   *     function, only layers which are visible and for which this function\n   *     returns `true` will be tested for features.  By default, all visible\n   *     layers will be tested.\n   * @param {U} thisArg2 Value to use as `this` when executing `layerFilter`.\n   * @return {T|undefined} Callback result.\n   * @template S,T,U\n   */\n  forEachLayerAtPixel(pixel, frameState, hitTolerance, callback, thisArg, layerFilter, thisArg2) {}\n\n  /**\n   * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n   * @param {module:ol/PluggableMap~FrameState} frameState FrameState.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @param {function(this: U, module:ol/layer/Layer): boolean} layerFilter Layer filter\n   *     function, only layers which are visible and for which this function\n   *     returns `true` will be tested for features.  By default, all visible\n   *     layers will be tested.\n   * @param {U} thisArg Value to use as `this` when executing `layerFilter`.\n   * @return {boolean} Is there a feature at the given coordinate?\n   * @template U\n   */\n  hasFeatureAtCoordinate(coordinate, frameState, hitTolerance, layerFilter, thisArg) {\n    const hasFeature = this.forEachFeatureAtCoordinate(\n      coordinate, frameState, hitTolerance, TRUE, this, layerFilter, thisArg);\n\n    return hasFeature !== undefined;\n  }\n\n  /**\n   * @param {module:ol/layer/Layer} layer Layer.\n   * @protected\n   * @return {module:ol/renderer/Layer} Layer renderer.\n   */\n  getLayerRenderer(layer) {\n    const layerKey = getUid(layer).toString();\n    if (layerKey in this.layerRenderers_) {\n      return this.layerRenderers_[layerKey];\n    } else {\n      let renderer;\n      for (let i = 0, ii = this.layerRendererConstructors_.length; i < ii; ++i) {\n        const candidate = this.layerRendererConstructors_[i];\n        if (candidate['handles'](layer)) {\n          renderer = candidate['create'](this, layer);\n          break;\n        }\n      }\n      if (renderer) {\n        this.layerRenderers_[layerKey] = renderer;\n        this.layerRendererListeners_[layerKey] = listen(renderer,\n          EventType.CHANGE, this.handleLayerRendererChange_, this);\n      } else {\n        throw new Error('Unable to create renderer for layer: ' + layer.getType());\n      }\n      return renderer;\n    }\n  }\n\n  /**\n   * @param {string} layerKey Layer key.\n   * @protected\n   * @return {module:ol/renderer/Layer} Layer renderer.\n   */\n  getLayerRendererByKey(layerKey) {\n    return this.layerRenderers_[layerKey];\n  }\n\n  /**\n   * @protected\n   * @return {Object<string, module:ol/renderer/Layer>} Layer renderers.\n   */\n  getLayerRenderers() {\n    return this.layerRenderers_;\n  }\n\n  /**\n   * @return {module:ol/PluggableMap} Map.\n   */\n  getMap() {\n    return this.map_;\n  }\n\n  /**\n   * Handle changes in a layer renderer.\n   * @private\n   */\n  handleLayerRendererChange_() {\n    this.map_.render();\n  }\n\n  /**\n   * @param {string} layerKey Layer key.\n   * @return {module:ol/renderer/Layer} Layer renderer.\n   * @private\n   */\n  removeLayerRendererByKey_(layerKey) {\n    const layerRenderer = this.layerRenderers_[layerKey];\n    delete this.layerRenderers_[layerKey];\n\n    unlistenByKey(this.layerRendererListeners_[layerKey]);\n    delete this.layerRendererListeners_[layerKey];\n\n    return layerRenderer;\n  }\n\n  /**\n   * @param {module:ol/PluggableMap} map Map.\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @private\n   */\n  removeUnusedLayerRenderers_(map, frameState) {\n    for (const layerKey in this.layerRenderers_) {\n      if (!frameState || !(layerKey in frameState.layerStates)) {\n        this.removeLayerRendererByKey_(layerKey).dispose();\n      }\n    }\n  }\n\n  /**\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @protected\n   */\n  scheduleExpireIconCache(frameState) {\n    frameState.postRenderFunctions.push(/** @type {module:ol/PluggableMap~PostRenderFunction} */ (expireIconCache));\n  }\n\n  /**\n   * @param {!module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @protected\n   */\n  scheduleRemoveUnusedLayerRenderers(frameState) {\n    for (const layerKey in this.layerRenderers_) {\n      if (!(layerKey in frameState.layerStates)) {\n        frameState.postRenderFunctions.push(\n          /** @type {module:ol/PluggableMap~PostRenderFunction} */ (this.removeUnusedLayerRenderers_.bind(this))\n        );\n        return;\n      }\n    }\n  }\n}\n\n\n/**\n * @param {module:ol/PluggableMap} map Map.\n * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n */\nfunction expireIconCache(map, frameState) {\n  iconImageCache.expire();\n}\n\n\n/**\n * Render.\n * @param {?module:ol/PluggableMap~FrameState} frameState Frame state.\n */\nMapRenderer.prototype.renderFrame = VOID;\n\n\n/**\n * @param {module:ol/render/EventType} type Event type.\n * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n */\nMapRenderer.prototype.dispatchRenderEvent = VOID;\n\n\n/**\n * @param {module:ol/layer/Layer~State} state1 First layer state.\n * @param {module:ol/layer/Layer~State} state2 Second layer state.\n * @return {number} The zIndex difference.\n */\nexport function sortByZIndex(state1, state2) {\n  return state1.zIndex - state2.zIndex;\n}\nexport default MapRenderer;\n","/**\n * @module ol/renderer/canvas/Map\n */\nimport {create as createTransform, apply as applyTransform, compose as composeTransform} from '../../transform.js';\nimport {includes, stableSort} from '../../array.js';\nimport {CLASS_UNSELECTABLE} from '../../css.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {visibleAtResolution} from '../../layer/Layer.js';\nimport RenderEvent from '../../render/Event.js';\nimport RenderEventType from '../../render/EventType.js';\nimport {rotateAtOffset} from '../../render/canvas.js';\nimport CanvasImmediateRenderer from '../../render/canvas/Immediate.js';\nimport MapRenderer, {sortByZIndex} from '../Map.js';\nimport SourceState from '../../source/State.js';\n\n\n/**\n * @type {Array<module:ol/renderer/Layer>}\n */\nexport const layerRendererConstructors = [];\n\n/**\n * @classdesc\n * Canvas map renderer.\n * @api\n */\nclass CanvasMapRenderer extends MapRenderer {\n\n  /**\n   * @param {module:ol/PluggableMap} map Map.\n   */\n  constructor(map) {\n    super(map);\n\n    const container = map.getViewport();\n\n    /**\n     * @private\n     * @type {CanvasRenderingContext2D}\n     */\n    this.context_ = createCanvasContext2D();\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement}\n     */\n    this.canvas_ = this.context_.canvas;\n\n    this.canvas_.style.width = '100%';\n    this.canvas_.style.height = '100%';\n    this.canvas_.style.display = 'block';\n    this.canvas_.className = CLASS_UNSELECTABLE;\n    container.insertBefore(this.canvas_, container.childNodes[0] || null);\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.renderedVisible_ = true;\n\n    /**\n     * @private\n     * @type {module:ol/transform~Transform}\n     */\n    this.transform_ = createTransform();\n\n  }\n\n  /**\n   * @param {module:ol/render/EventType} type Event type.\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   */\n  dispatchRenderEvent(type, frameState) {\n    const map = this.getMap();\n    const context = this.context_;\n    if (map.hasListener(type)) {\n      const extent = frameState.extent;\n      const pixelRatio = frameState.pixelRatio;\n      const viewState = frameState.viewState;\n      const rotation = viewState.rotation;\n\n      const transform = this.getTransform(frameState);\n\n      const vectorContext = new CanvasImmediateRenderer(context, pixelRatio,\n        extent, transform, rotation);\n      const composeEvent = new RenderEvent(type, vectorContext,\n        frameState, context, null);\n      map.dispatchEvent(composeEvent);\n    }\n  }\n\n  /**\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @protected\n   * @return {!module:ol/transform~Transform} Transform.\n   */\n  getTransform(frameState) {\n    const viewState = frameState.viewState;\n    const dx1 = this.canvas_.width / 2;\n    const dy1 = this.canvas_.height / 2;\n    const sx = frameState.pixelRatio / viewState.resolution;\n    const sy = -sx;\n    const angle = -viewState.rotation;\n    const dx2 = -viewState.center[0];\n    const dy2 = -viewState.center[1];\n    return composeTransform(this.transform_, dx1, dy1, sx, sy, angle, dx2, dy2);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  renderFrame(frameState) {\n\n    if (!frameState) {\n      if (this.renderedVisible_) {\n        this.canvas_.style.display = 'none';\n        this.renderedVisible_ = false;\n      }\n      return;\n    }\n\n    const context = this.context_;\n    const pixelRatio = frameState.pixelRatio;\n    const width = Math.round(frameState.size[0] * pixelRatio);\n    const height = Math.round(frameState.size[1] * pixelRatio);\n    if (this.canvas_.width != width || this.canvas_.height != height) {\n      this.canvas_.width = width;\n      this.canvas_.height = height;\n    } else {\n      context.clearRect(0, 0, width, height);\n    }\n\n    const rotation = frameState.viewState.rotation;\n\n    this.calculateMatrices2D(frameState);\n\n    this.dispatchRenderEvent(RenderEventType.PRECOMPOSE, frameState);\n\n    const layerStatesArray = frameState.layerStatesArray;\n    stableSort(layerStatesArray, sortByZIndex);\n\n    if (rotation) {\n      context.save();\n      rotateAtOffset(context, rotation, width / 2, height / 2);\n    }\n\n    const viewResolution = frameState.viewState.resolution;\n    let i, ii, layer, layerRenderer, layerState;\n    for (i = 0, ii = layerStatesArray.length; i < ii; ++i) {\n      layerState = layerStatesArray[i];\n      layer = layerState.layer;\n      layerRenderer = /** @type {module:ol/renderer/canvas/Layer} */ (this.getLayerRenderer(layer));\n      if (!visibleAtResolution(layerState, viewResolution) ||\n          layerState.sourceState != SourceState.READY) {\n        continue;\n      }\n      if (layerRenderer.prepareFrame(frameState, layerState)) {\n        layerRenderer.composeFrame(frameState, layerState, context);\n      }\n    }\n\n    if (rotation) {\n      context.restore();\n    }\n\n    this.dispatchRenderEvent(RenderEventType.POSTCOMPOSE, frameState);\n\n    if (!this.renderedVisible_) {\n      this.canvas_.style.display = '';\n      this.renderedVisible_ = true;\n    }\n\n    this.scheduleRemoveUnusedLayerRenderers(frameState);\n    this.scheduleExpireIconCache(frameState);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  forEachLayerAtPixel(pixel, frameState, hitTolerance, callback, thisArg, layerFilter, thisArg2) {\n    let result;\n    const viewState = frameState.viewState;\n    const viewResolution = viewState.resolution;\n\n    const layerStates = frameState.layerStatesArray;\n    const numLayers = layerStates.length;\n\n    const coordinate = applyTransform(\n      frameState.pixelToCoordinateTransform, pixel.slice());\n\n    let i;\n    for (i = numLayers - 1; i >= 0; --i) {\n      const layerState = layerStates[i];\n      const layer = layerState.layer;\n      if (visibleAtResolution(layerState, viewResolution) && layerFilter.call(thisArg2, layer)) {\n        const layerRenderer = /** @type {module:ol/renderer/canvas/Layer} */ (this.getLayerRenderer(layer));\n        result = layerRenderer.forEachLayerAtCoordinate(\n          coordinate, frameState, hitTolerance, callback, thisArg);\n        if (result) {\n          return result;\n        }\n      }\n    }\n    return undefined;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  registerLayerRenderers(constructors) {\n    super.registerLayerRenderers(constructors);\n    for (let i = 0, ii = constructors.length; i < ii; ++i) {\n      const ctor = constructors[i];\n      if (!includes(layerRendererConstructors, ctor)) {\n        layerRendererConstructors.push(ctor);\n      }\n    }\n  }\n}\n\n\nexport default CanvasMapRenderer;\n","/**\n * @module ol/renderer/Layer\n */\nimport {getUid} from '../util.js';\nimport ImageState from '../ImageState.js';\nimport Observable from '../Observable.js';\nimport TileState from '../TileState.js';\nimport {listen} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {FALSE, VOID} from '../functions.js';\nimport SourceState from '../source/State.js';\n\nclass LayerRenderer extends Observable {\n\n  /**\n   * @param {module:ol/layer/Layer} layer Layer.\n   */\n  constructor(layer) {\n\n    super();\n\n    /**\n     * @private\n     * @type {module:ol/layer/Layer}\n     */\n    this.layer_ = layer;\n\n  }\n\n  /**\n   * Create a function that adds loaded tiles to the tile lookup.\n   * @param {module:ol/source/Tile} source Tile source.\n   * @param {module:ol/proj/Projection} projection Projection of the tiles.\n   * @param {Object<number, Object<string, module:ol/Tile>>} tiles Lookup of loaded tiles by zoom level.\n   * @return {function(number, module:ol/TileRange):boolean} A function that can be\n   *     called with a zoom level and a tile range to add loaded tiles to the lookup.\n   * @protected\n   */\n  createLoadedTileFinder(source, projection, tiles) {\n    return (\n      /**\n       * @param {number} zoom Zoom level.\n       * @param {module:ol/TileRange} tileRange Tile range.\n       * @return {boolean} The tile range is fully loaded.\n       */\n      function(zoom, tileRange) {\n        function callback(tile) {\n          if (!tiles[zoom]) {\n            tiles[zoom] = {};\n          }\n          tiles[zoom][tile.tileCoord.toString()] = tile;\n        }\n        return source.forEachLoadedTile(projection, zoom, tileRange, callback);\n      }\n    );\n  }\n\n  /**\n   * @return {module:ol/layer/Layer} Layer.\n   */\n  getLayer() {\n    return this.layer_;\n  }\n\n  /**\n   * Handle changes in image state.\n   * @param {module:ol/events/Event} event Image change event.\n   * @private\n   */\n  handleImageChange_(event) {\n    const image = /** @type {module:ol/Image} */ (event.target);\n    if (image.getState() === ImageState.LOADED) {\n      this.renderIfReadyAndVisible();\n    }\n  }\n\n  /**\n   * Load the image if not already loaded, and register the image change\n   * listener if needed.\n   * @param {module:ol/ImageBase} image Image.\n   * @return {boolean} `true` if the image is already loaded, `false` otherwise.\n   * @protected\n   */\n  loadImage(image) {\n    let imageState = image.getState();\n    if (imageState != ImageState.LOADED && imageState != ImageState.ERROR) {\n      listen(image, EventType.CHANGE, this.handleImageChange_, this);\n    }\n    if (imageState == ImageState.IDLE) {\n      image.load();\n      imageState = image.getState();\n    }\n    return imageState == ImageState.LOADED;\n  }\n\n  /**\n   * @protected\n   */\n  renderIfReadyAndVisible() {\n    const layer = this.getLayer();\n    if (layer.getVisible() && layer.getSourceState() == SourceState.READY) {\n      this.changed();\n    }\n  }\n\n  /**\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @param {module:ol/source/Tile} tileSource Tile source.\n   * @protected\n   */\n  scheduleExpireCache(frameState, tileSource) {\n    if (tileSource.canExpireCache()) {\n      /**\n       * @param {module:ol/source/Tile} tileSource Tile source.\n       * @param {module:ol/PluggableMap} map Map.\n       * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n       */\n      const postRenderFunction = function(tileSource, map, frameState) {\n        const tileSourceKey = getUid(tileSource).toString();\n        if (tileSourceKey in frameState.usedTiles) {\n          tileSource.expireCache(frameState.viewState.projection,\n            frameState.usedTiles[tileSourceKey]);\n        }\n      }.bind(null, tileSource);\n\n      frameState.postRenderFunctions.push(\n        /** @type {module:ol/PluggableMap~PostRenderFunction} */ (postRenderFunction)\n      );\n    }\n  }\n\n  /**\n   * @param {!Object<string, !Object<string, module:ol/TileRange>>} usedTiles Used tiles.\n   * @param {module:ol/source/Tile} tileSource Tile source.\n   * @param {number} z Z.\n   * @param {module:ol/TileRange} tileRange Tile range.\n   * @protected\n   */\n  updateUsedTiles(usedTiles, tileSource, z, tileRange) {\n    // FIXME should we use tilesToDrawByZ instead?\n    const tileSourceKey = getUid(tileSource).toString();\n    const zKey = z.toString();\n    if (tileSourceKey in usedTiles) {\n      if (zKey in usedTiles[tileSourceKey]) {\n        usedTiles[tileSourceKey][zKey].extend(tileRange);\n      } else {\n        usedTiles[tileSourceKey][zKey] = tileRange;\n      }\n    } else {\n      usedTiles[tileSourceKey] = {};\n      usedTiles[tileSourceKey][zKey] = tileRange;\n    }\n  }\n\n  /**\n   * Manage tile pyramid.\n   * This function performs a number of functions related to the tiles at the\n   * current zoom and lower zoom levels:\n   * - registers idle tiles in frameState.wantedTiles so that they are not\n   *   discarded by the tile queue\n   * - enqueues missing tiles\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @param {module:ol/source/Tile} tileSource Tile source.\n   * @param {module:ol/tilegrid/TileGrid} tileGrid Tile grid.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {number} currentZ Current Z.\n   * @param {number} preload Load low resolution tiles up to 'preload' levels.\n   * @param {function(this: T, module:ol/Tile)=} opt_tileCallback Tile callback.\n   * @param {T=} opt_this Object to use as `this` in `opt_tileCallback`.\n   * @protected\n   * @template T\n   */\n  manageTilePyramid(\n    frameState,\n    tileSource,\n    tileGrid,\n    pixelRatio,\n    projection,\n    extent,\n    currentZ,\n    preload,\n    opt_tileCallback,\n    opt_this\n  ) {\n    const tileSourceKey = getUid(tileSource).toString();\n    if (!(tileSourceKey in frameState.wantedTiles)) {\n      frameState.wantedTiles[tileSourceKey] = {};\n    }\n    const wantedTiles = frameState.wantedTiles[tileSourceKey];\n    const tileQueue = frameState.tileQueue;\n    const minZoom = tileGrid.getMinZoom();\n    let tile, tileRange, tileResolution, x, y, z;\n    for (z = minZoom; z <= currentZ; ++z) {\n      tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z, tileRange);\n      tileResolution = tileGrid.getResolution(z);\n      for (x = tileRange.minX; x <= tileRange.maxX; ++x) {\n        for (y = tileRange.minY; y <= tileRange.maxY; ++y) {\n          if (currentZ - z <= preload) {\n            tile = tileSource.getTile(z, x, y, pixelRatio, projection);\n            if (tile.getState() == TileState.IDLE) {\n              wantedTiles[tile.getKey()] = true;\n              if (!tileQueue.isKeyQueued(tile.getKey())) {\n                tileQueue.enqueue([tile, tileSourceKey,\n                  tileGrid.getTileCoordCenter(tile.tileCoord), tileResolution]);\n              }\n            }\n            if (opt_tileCallback !== undefined) {\n              opt_tileCallback.call(opt_this, tile);\n            }\n          } else {\n            tileSource.useTile(z, x, y, projection);\n          }\n        }\n      }\n    }\n  }\n}\n\n\n/**\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n * @param {number} hitTolerance Hit tolerance in pixels.\n * @param {function(this: S, (module:ol/Feature|module:ol/render/Feature), module:ol/layer/Layer): T} callback Feature callback.\n * @param {S} thisArg Value to use as `this` when executing `callback`.\n * @return {T|void} Callback result.\n * @template S,T\n */\nLayerRenderer.prototype.forEachFeatureAtCoordinate = VOID;\n\n\n/**\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n * @return {boolean} Is there a feature at the given coordinate?\n */\nLayerRenderer.prototype.hasFeatureAtCoordinate = FALSE;\n\n\nexport default LayerRenderer;\n","/**\n * @module ol/renderer/canvas/Layer\n */\nimport {getBottomLeft, getBottomRight, getTopLeft, getTopRight} from '../../extent.js';\nimport {TRUE} from '../../functions.js';\nimport RenderEvent from '../../render/Event.js';\nimport RenderEventType from '../../render/EventType.js';\nimport {rotateAtOffset} from '../../render/canvas.js';\nimport CanvasImmediateRenderer from '../../render/canvas/Immediate.js';\nimport LayerRenderer from '../Layer.js';\nimport {create as createTransform, apply as applyTransform, compose as composeTransform} from '../../transform.js';\n\nclass CanvasLayerRenderer extends LayerRenderer {\n\n  /**\n   * @param {module:ol/layer/Layer} layer Layer.\n   */\n  constructor(layer) {\n\n    super(layer);\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.renderedResolution;\n\n    /**\n     * @private\n     * @type {module:ol/transform~Transform}\n     */\n    this.transform_ = createTransform();\n\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @param {module:ol/extent~Extent} extent Clip extent.\n   * @protected\n   */\n  clip(context, frameState, extent) {\n    const pixelRatio = frameState.pixelRatio;\n    const width = frameState.size[0] * pixelRatio;\n    const height = frameState.size[1] * pixelRatio;\n    const rotation = frameState.viewState.rotation;\n    const topLeft = getTopLeft(/** @type {module:ol/extent~Extent} */ (extent));\n    const topRight = getTopRight(/** @type {module:ol/extent~Extent} */ (extent));\n    const bottomRight = getBottomRight(/** @type {module:ol/extent~Extent} */ (extent));\n    const bottomLeft = getBottomLeft(/** @type {module:ol/extent~Extent} */ (extent));\n\n    applyTransform(frameState.coordinateToPixelTransform, topLeft);\n    applyTransform(frameState.coordinateToPixelTransform, topRight);\n    applyTransform(frameState.coordinateToPixelTransform, bottomRight);\n    applyTransform(frameState.coordinateToPixelTransform, bottomLeft);\n\n    context.save();\n    rotateAtOffset(context, -rotation, width / 2, height / 2);\n    context.beginPath();\n    context.moveTo(topLeft[0] * pixelRatio, topLeft[1] * pixelRatio);\n    context.lineTo(topRight[0] * pixelRatio, topRight[1] * pixelRatio);\n    context.lineTo(bottomRight[0] * pixelRatio, bottomRight[1] * pixelRatio);\n    context.lineTo(bottomLeft[0] * pixelRatio, bottomLeft[1] * pixelRatio);\n    context.clip();\n    rotateAtOffset(context, rotation, width / 2, height / 2);\n  }\n\n  /**\n   * @param {module:ol/render/EventType} type Event type.\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @param {module:ol/transform~Transform=} opt_transform Transform.\n   * @private\n   */\n  dispatchComposeEvent_(type, context, frameState, opt_transform) {\n    const layer = this.getLayer();\n    if (layer.hasListener(type)) {\n      const width = frameState.size[0] * frameState.pixelRatio;\n      const height = frameState.size[1] * frameState.pixelRatio;\n      const rotation = frameState.viewState.rotation;\n      rotateAtOffset(context, -rotation, width / 2, height / 2);\n      const transform = opt_transform !== undefined ?\n        opt_transform : this.getTransform(frameState, 0);\n      const render = new CanvasImmediateRenderer(\n        context, frameState.pixelRatio, frameState.extent, transform,\n        frameState.viewState.rotation);\n      const composeEvent = new RenderEvent(type, render, frameState,\n        context, null);\n      layer.dispatchEvent(composeEvent);\n      rotateAtOffset(context, rotation, width / 2, height / 2);\n    }\n  }\n\n  /**\n   * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n   * @param {module:ol/PluggableMap~FrameState} frameState FrameState.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @param {function(this: S, module:ol/layer/Layer, (Uint8ClampedArray|Uint8Array)): T} callback Layer\n   *     callback.\n   * @param {S} thisArg Value to use as `this` when executing `callback`.\n   * @return {T|undefined} Callback result.\n   * @template S,T,U\n   */\n  forEachLayerAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg) {\n    const hasFeature = this.forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, TRUE, this);\n\n    if (hasFeature) {\n      return callback.call(thisArg, this.getLayer(), null);\n    } else {\n      return undefined;\n    }\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @param {module:ol/layer/Layer~State} layerState Layer state.\n   * @param {module:ol/transform~Transform=} opt_transform Transform.\n   * @protected\n   */\n  postCompose(context, frameState, layerState, opt_transform) {\n    this.dispatchComposeEvent_(RenderEventType.POSTCOMPOSE, context, frameState, opt_transform);\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @param {module:ol/transform~Transform=} opt_transform Transform.\n   * @protected\n   */\n  preCompose(context, frameState, opt_transform) {\n    this.dispatchComposeEvent_(RenderEventType.PRECOMPOSE, context, frameState, opt_transform);\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @param {module:ol/transform~Transform=} opt_transform Transform.\n   * @protected\n   */\n  dispatchRenderEvent(context, frameState, opt_transform) {\n    this.dispatchComposeEvent_(RenderEventType.RENDER, context, frameState, opt_transform);\n  }\n\n  /**\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @param {number} offsetX Offset on the x-axis in view coordinates.\n   * @protected\n   * @return {!module:ol/transform~Transform} Transform.\n   */\n  getTransform(frameState, offsetX) {\n    const viewState = frameState.viewState;\n    const pixelRatio = frameState.pixelRatio;\n    const dx1 = pixelRatio * frameState.size[0] / 2;\n    const dy1 = pixelRatio * frameState.size[1] / 2;\n    const sx = pixelRatio / viewState.resolution;\n    const sy = -sx;\n    const angle = -viewState.rotation;\n    const dx2 = -viewState.center[0] + offsetX;\n    const dy2 = -viewState.center[1];\n    return composeTransform(this.transform_, dx1, dy1, sx, sy, angle, dx2, dy2);\n  }\n\n  /**\n   * @abstract\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @param {module:ol/layer/Layer~State} layerState Layer state.\n   * @param {CanvasRenderingContext2D} context Context.\n   */\n  composeFrame(frameState, layerState, context) {}\n\n  /**\n   * @abstract\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @param {module:ol/layer/Layer~State} layerState Layer state.\n   * @return {boolean} whether composeFrame should be called.\n   */\n  prepareFrame(frameState, layerState) {}\n}\n\nexport default CanvasLayerRenderer;\n","/**\n * @module ol/renderer/canvas/IntermediateCanvas\n */\nimport {scale as scaleCoordinate} from '../../coordinate.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {containsExtent, intersects} from '../../extent.js';\nimport {VOID} from '../../functions.js';\nimport CanvasLayerRenderer from '../canvas/Layer.js';\nimport {create as createTransform, apply as applyTransform} from '../../transform.js';\n\nclass IntermediateCanvasRenderer extends CanvasLayerRenderer {\n\n  /**\n   * @param {module:ol/layer/Layer} layer Layer.\n   */\n  constructor(layer) {\n\n    super(layer);\n\n    /**\n     * @protected\n     * @type {module:ol/transform~Transform}\n     */\n    this.coordinateToCanvasPixelTransform = createTransform();\n\n    /**\n     * @private\n     * @type {CanvasRenderingContext2D}\n     */\n    this.hitCanvasContext_ = null;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  composeFrame(frameState, layerState, context) {\n\n    this.preCompose(context, frameState);\n\n    const image = this.getImage();\n    if (image) {\n\n      // clipped rendering if layer extent is set\n      const extent = layerState.extent;\n      const clipped = extent !== undefined &&\n          !containsExtent(extent, frameState.extent) &&\n          intersects(extent, frameState.extent);\n      if (clipped) {\n        this.clip(context, frameState, /** @type {module:ol/extent~Extent} */ (extent));\n      }\n\n      const imageTransform = this.getImageTransform();\n      // for performance reasons, context.save / context.restore is not used\n      // to save and restore the transformation matrix and the opacity.\n      // see http://jsperf.com/context-save-restore-versus-variable\n      const alpha = context.globalAlpha;\n      context.globalAlpha = layerState.opacity;\n\n      // for performance reasons, context.setTransform is only used\n      // when the view is rotated. see http://jsperf.com/canvas-transform\n      const dx = imageTransform[4];\n      const dy = imageTransform[5];\n      const dw = image.width * imageTransform[0];\n      const dh = image.height * imageTransform[3];\n      context.drawImage(image, 0, 0, +image.width, +image.height,\n        Math.round(dx), Math.round(dy), Math.round(dw), Math.round(dh));\n      context.globalAlpha = alpha;\n\n      if (clipped) {\n        context.restore();\n      }\n    }\n\n    this.postCompose(context, frameState, layerState);\n  }\n\n  /**\n   * @abstract\n   * @return {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement} Canvas.\n   */\n  getImage() {}\n\n  /**\n   * @abstract\n   * @return {!module:ol/transform~Transform} Image transform.\n   */\n  getImageTransform() {}\n\n  /**\n   * @inheritDoc\n   */\n  forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg) {\n    const layer = this.getLayer();\n    const source = layer.getSource();\n    const resolution = frameState.viewState.resolution;\n    const rotation = frameState.viewState.rotation;\n    const skippedFeatureUids = frameState.skippedFeatureUids;\n    return source.forEachFeatureAtCoordinate(\n      coordinate, resolution, rotation, hitTolerance, skippedFeatureUids,\n      /**\n       * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n       * @return {?} Callback result.\n       */\n      function(feature) {\n        return callback.call(thisArg, feature, layer);\n      });\n  }\n\n  /**\n   * @inheritDoc\n   */\n  forEachLayerAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg) {\n    if (!this.getImage()) {\n      return undefined;\n    }\n\n    if (this.getLayer().getSource().forEachFeatureAtCoordinate !== VOID) {\n      // for ImageCanvas sources use the original hit-detection logic,\n      // so that for example also transparent polygons are detected\n      return super.forEachLayerAtCoordinate(arguments);\n    } else {\n      const pixel = applyTransform(this.coordinateToCanvasPixelTransform, coordinate.slice());\n      scaleCoordinate(pixel, frameState.viewState.resolution / this.renderedResolution);\n\n      if (!this.hitCanvasContext_) {\n        this.hitCanvasContext_ = createCanvasContext2D(1, 1);\n      }\n\n      this.hitCanvasContext_.clearRect(0, 0, 1, 1);\n      this.hitCanvasContext_.drawImage(this.getImage(), pixel[0], pixel[1], 1, 1, 0, 0, 1, 1);\n\n      const imageData = this.hitCanvasContext_.getImageData(0, 0, 1, 1).data;\n      if (imageData[3] > 0) {\n        return callback.call(thisArg, this.getLayer(), imageData);\n      } else {\n        return undefined;\n      }\n    }\n  }\n}\n\n\nexport default IntermediateCanvasRenderer;\n","/**\n * @module ol/renderer/canvas/ImageLayer\n */\nimport {ENABLE_RASTER_REPROJECTION} from '../../reproj/common.js';\nimport ImageCanvas from '../../ImageCanvas.js';\nimport LayerType from '../../LayerType.js';\nimport ViewHint from '../../ViewHint.js';\nimport {equals} from '../../array.js';\nimport {getHeight, getIntersection, getWidth, isEmpty} from '../../extent.js';\nimport VectorRenderType from '../../layer/VectorRenderType.js';\nimport {assign} from '../../obj.js';\nimport {layerRendererConstructors} from './Map.js';\nimport IntermediateCanvasRenderer from './IntermediateCanvas.js';\nimport {create as createTransform, compose as composeTransform} from '../../transform.js';\n\n/**\n * @classdesc\n * Canvas renderer for image layers.\n * @api\n */\nclass CanvasImageLayerRenderer extends IntermediateCanvasRenderer {\n\n  /**\n   * @param {module:ol/layer/Image|module:ol/layer/Vector} imageLayer Image or vector layer.\n   */\n  constructor(imageLayer) {\n\n    super(imageLayer);\n\n    /**\n     * @private\n     * @type {?module:ol/ImageBase}\n     */\n    this.image_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/transform~Transform}\n     */\n    this.imageTransform_ = createTransform();\n\n    /**\n     * @type {!Array<string>}\n     */\n    this.skippedFeatures_ = [];\n\n    /**\n     * @private\n     * @type {module:ol/renderer/canvas/VectorLayer}\n     */\n    this.vectorRenderer_ = null;\n\n    if (imageLayer.getType() === LayerType.VECTOR) {\n      for (let i = 0, ii = layerRendererConstructors.length; i < ii; ++i) {\n        const ctor = layerRendererConstructors[i];\n        if (ctor !== CanvasImageLayerRenderer && ctor['handles'](imageLayer)) {\n          this.vectorRenderer_ = new ctor(imageLayer);\n          break;\n        }\n      }\n    }\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    if (this.vectorRenderer_) {\n      this.vectorRenderer_.dispose();\n    }\n    super.disposeInternal();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getImage() {\n    return !this.image_ ? null : this.image_.getImage();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getImageTransform() {\n    return this.imageTransform_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  prepareFrame(frameState, layerState) {\n\n    const pixelRatio = frameState.pixelRatio;\n    const size = frameState.size;\n    const viewState = frameState.viewState;\n    const viewCenter = viewState.center;\n    const viewResolution = viewState.resolution;\n\n    let image;\n    const imageLayer = /** @type {module:ol/layer/Image} */ (this.getLayer());\n    const imageSource = imageLayer.getSource();\n\n    const hints = frameState.viewHints;\n\n    const vectorRenderer = this.vectorRenderer_;\n    let renderedExtent = frameState.extent;\n    if (!vectorRenderer && layerState.extent !== undefined) {\n      renderedExtent = getIntersection(renderedExtent, layerState.extent);\n    }\n\n    if (!hints[ViewHint.ANIMATING] && !hints[ViewHint.INTERACTING] &&\n        !isEmpty(renderedExtent)) {\n      let projection = viewState.projection;\n      if (!ENABLE_RASTER_REPROJECTION) {\n        const sourceProjection = imageSource.getProjection();\n        if (sourceProjection) {\n          projection = sourceProjection;\n        }\n      }\n      let skippedFeatures = this.skippedFeatures_;\n      if (vectorRenderer) {\n        const context = vectorRenderer.context;\n        const imageFrameState = /** @type {module:ol/PluggableMap~FrameState} */ (assign({}, frameState, {\n          size: [\n            getWidth(renderedExtent) / viewResolution,\n            getHeight(renderedExtent) / viewResolution\n          ],\n          viewState: /** @type {module:ol/View~State} */ (assign({}, frameState.viewState, {\n            rotation: 0\n          }))\n        }));\n        const newSkippedFeatures = Object.keys(imageFrameState.skippedFeatureUids).sort();\n        image = new ImageCanvas(renderedExtent, viewResolution, pixelRatio, context.canvas, function(callback) {\n          if (vectorRenderer.prepareFrame(imageFrameState, layerState) &&\n              (vectorRenderer.replayGroupChanged ||\n              !equals(skippedFeatures, newSkippedFeatures))) {\n            context.canvas.width = imageFrameState.size[0] * pixelRatio;\n            context.canvas.height = imageFrameState.size[1] * pixelRatio;\n            vectorRenderer.compose(context, imageFrameState, layerState);\n            skippedFeatures = newSkippedFeatures;\n            callback();\n          }\n        });\n      } else {\n        image = imageSource.getImage(\n          renderedExtent, viewResolution, pixelRatio, projection);\n      }\n      if (image && this.loadImage(image)) {\n        this.image_ = image;\n        this.skippedFeatures_ = skippedFeatures;\n      }\n    }\n\n    if (this.image_) {\n      image = this.image_;\n      const imageExtent = image.getExtent();\n      const imageResolution = image.getResolution();\n      const imagePixelRatio = image.getPixelRatio();\n      const scale = pixelRatio * imageResolution /\n          (viewResolution * imagePixelRatio);\n      const transform = composeTransform(this.imageTransform_,\n        pixelRatio * size[0] / 2, pixelRatio * size[1] / 2,\n        scale, scale,\n        0,\n        imagePixelRatio * (imageExtent[0] - viewCenter[0]) / imageResolution,\n        imagePixelRatio * (viewCenter[1] - imageExtent[3]) / imageResolution);\n      composeTransform(this.coordinateToCanvasPixelTransform,\n        pixelRatio * size[0] / 2 - transform[4], pixelRatio * size[1] / 2 - transform[5],\n        pixelRatio / viewResolution, -pixelRatio / viewResolution,\n        0,\n        -viewCenter[0], -viewCenter[1]);\n\n      this.renderedResolution = imageResolution * pixelRatio / imagePixelRatio;\n    }\n\n    return !!this.image_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg) {\n    if (this.vectorRenderer_) {\n      return this.vectorRenderer_.forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg);\n    } else {\n      return super.forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg);\n    }\n  }\n}\n\n\n/**\n * Determine if this renderer handles the provided layer.\n * @param {module:ol/layer/Layer} layer The candidate layer.\n * @return {boolean} The renderer can render the layer.\n */\nCanvasImageLayerRenderer['handles'] = function(layer) {\n  return layer.getType() === LayerType.IMAGE ||\n    layer.getType() === LayerType.VECTOR &&\n    /** @type {module:ol/layer/Vector} */ (layer).getRenderMode() === VectorRenderType.IMAGE;\n};\n\n\n/**\n * Create a layer renderer.\n * @param {module:ol/renderer/Map} mapRenderer The map renderer.\n * @param {module:ol/layer/Layer} layer The layer to be rendererd.\n * @return {module:ol/renderer/canvas/ImageLayer} The layer renderer.\n */\nCanvasImageLayerRenderer['create'] = function(mapRenderer, layer) {\n  return new CanvasImageLayerRenderer(/** @type {module:ol/layer/Image} */ (layer));\n};\n\n\nexport default CanvasImageLayerRenderer;\n","/**\n * @module ol/renderer/canvas/TileLayer\n */\nimport {getUid} from '../../util.js';\nimport LayerType from '../../LayerType.js';\nimport TileRange from '../../TileRange.js';\nimport TileState from '../../TileState.js';\nimport ViewHint from '../../ViewHint.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {containsExtent, createEmpty, equals, getIntersection, isEmpty} from '../../extent.js';\nimport IntermediateCanvasRenderer from '../canvas/IntermediateCanvas.js';\nimport {create as createTransform, compose as composeTransform} from '../../transform.js';\n\n/**\n * @classdesc\n * Canvas renderer for tile layers.\n * @api\n */\nclass CanvasTileLayerRenderer extends IntermediateCanvasRenderer {\n\n  /**\n   * @param {module:ol/layer/Tile|module:ol/layer/VectorTile} tileLayer Tile layer.\n   * @param {boolean=} opt_noContext Skip the context creation.\n   */\n  constructor(tileLayer, opt_noContext) {\n\n    super(tileLayer);\n\n    /**\n     * @protected\n     * @type {CanvasRenderingContext2D}\n     */\n    this.context = opt_noContext ? null : createCanvasContext2D();\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.oversampling_;\n\n    /**\n     * @private\n     * @type {module:ol/extent~Extent}\n     */\n    this.renderedExtent_ = null;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.renderedRevision;\n\n    /**\n     * @protected\n     * @type {!Array<module:ol/Tile>}\n     */\n    this.renderedTiles = [];\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.newTiles_ = false;\n\n    /**\n     * @protected\n     * @type {module:ol/extent~Extent}\n     */\n    this.tmpExtent = createEmpty();\n\n    /**\n     * @private\n     * @type {module:ol/TileRange}\n     */\n    this.tmpTileRange_ = new TileRange(0, 0, 0, 0);\n\n    /**\n     * @private\n     * @type {module:ol/transform~Transform}\n     */\n    this.imageTransform_ = createTransform();\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.zDirection = 0;\n\n  }\n\n  /**\n   * @private\n   * @param {module:ol/Tile} tile Tile.\n   * @return {boolean} Tile is drawable.\n   */\n  isDrawableTile_(tile) {\n    const tileState = tile.getState();\n    const useInterimTilesOnError = this.getLayer().getUseInterimTilesOnError();\n    return tileState == TileState.LOADED ||\n        tileState == TileState.EMPTY ||\n        tileState == TileState.ERROR && !useInterimTilesOnError;\n  }\n\n  /**\n   * @param {number} z Tile coordinate z.\n   * @param {number} x Tile coordinate x.\n   * @param {number} y Tile coordinate y.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @return {!module:ol/Tile} Tile.\n   */\n  getTile(z, x, y, pixelRatio, projection) {\n    const layer = this.getLayer();\n    const source = /** @type {module:ol/source/Tile} */ (layer.getSource());\n    let tile = source.getTile(z, x, y, pixelRatio, projection);\n    if (tile.getState() == TileState.ERROR) {\n      if (!layer.getUseInterimTilesOnError()) {\n        // When useInterimTilesOnError is false, we consider the error tile as loaded.\n        tile.setState(TileState.LOADED);\n      } else if (layer.getPreload() > 0) {\n        // Preloaded tiles for lower resolutions might have finished loading.\n        this.newTiles_ = true;\n      }\n    }\n    if (!this.isDrawableTile_(tile)) {\n      tile = tile.getInterimTile();\n    }\n    return tile;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  prepareFrame(frameState, layerState) {\n\n    const pixelRatio = frameState.pixelRatio;\n    const size = frameState.size;\n    const viewState = frameState.viewState;\n    const projection = viewState.projection;\n    const viewResolution = viewState.resolution;\n    const viewCenter = viewState.center;\n\n    const tileLayer = this.getLayer();\n    const tileSource = /** @type {module:ol/source/Tile} */ (tileLayer.getSource());\n    const sourceRevision = tileSource.getRevision();\n    const tileGrid = tileSource.getTileGridForProjection(projection);\n    const z = tileGrid.getZForResolution(viewResolution, this.zDirection);\n    const tileResolution = tileGrid.getResolution(z);\n    let oversampling = Math.round(viewResolution / tileResolution) || 1;\n    let extent = frameState.extent;\n\n    if (layerState.extent !== undefined) {\n      extent = getIntersection(extent, layerState.extent);\n    }\n    if (isEmpty(extent)) {\n      // Return false to prevent the rendering of the layer.\n      return false;\n    }\n\n    const tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);\n    const imageExtent = tileGrid.getTileRangeExtent(z, tileRange);\n\n    const tilePixelRatio = tileSource.getTilePixelRatio(pixelRatio);\n\n    /**\n     * @type {Object<number, Object<string, module:ol/Tile>>}\n     */\n    const tilesToDrawByZ = {};\n    tilesToDrawByZ[z] = {};\n\n    const findLoadedTiles = this.createLoadedTileFinder(\n      tileSource, projection, tilesToDrawByZ);\n\n    const hints = frameState.viewHints;\n    const animatingOrInteracting = hints[ViewHint.ANIMATING] || hints[ViewHint.INTERACTING];\n\n    const tmpExtent = this.tmpExtent;\n    const tmpTileRange = this.tmpTileRange_;\n    this.newTiles_ = false;\n    let tile, x, y;\n    for (x = tileRange.minX; x <= tileRange.maxX; ++x) {\n      for (y = tileRange.minY; y <= tileRange.maxY; ++y) {\n        if (Date.now() - frameState.time > 16 && animatingOrInteracting) {\n          continue;\n        }\n        tile = this.getTile(z, x, y, pixelRatio, projection);\n        if (this.isDrawableTile_(tile)) {\n          const uid = getUid(this);\n          if (tile.getState() == TileState.LOADED) {\n            tilesToDrawByZ[z][tile.tileCoord.toString()] = tile;\n            const inTransition = tile.inTransition(uid);\n            if (!this.newTiles_ && (inTransition || this.renderedTiles.indexOf(tile) === -1)) {\n              this.newTiles_ = true;\n            }\n          }\n          if (tile.getAlpha(uid, frameState.time) === 1) {\n            // don't look for alt tiles if alpha is 1\n            continue;\n          }\n        }\n\n        const childTileRange = tileGrid.getTileCoordChildTileRange(\n          tile.tileCoord, tmpTileRange, tmpExtent);\n        let covered = false;\n        if (childTileRange) {\n          covered = findLoadedTiles(z + 1, childTileRange);\n        }\n        if (!covered) {\n          tileGrid.forEachTileCoordParentTileRange(\n            tile.tileCoord, findLoadedTiles, null, tmpTileRange, tmpExtent);\n        }\n\n      }\n    }\n\n    const renderedResolution = tileResolution * pixelRatio / tilePixelRatio * oversampling;\n    if (!(this.renderedResolution && Date.now() - frameState.time > 16 && animatingOrInteracting) && (\n      this.newTiles_ ||\n          !(this.renderedExtent_ && containsExtent(this.renderedExtent_, extent)) ||\n          this.renderedRevision != sourceRevision ||\n          oversampling != this.oversampling_ ||\n          !animatingOrInteracting && renderedResolution != this.renderedResolution\n    )) {\n\n      const context = this.context;\n      if (context) {\n        const tilePixelSize = tileSource.getTilePixelSize(z, pixelRatio, projection);\n        const width = Math.round(tileRange.getWidth() * tilePixelSize[0] / oversampling);\n        const height = Math.round(tileRange.getHeight() * tilePixelSize[1] / oversampling);\n        const canvas = context.canvas;\n        if (canvas.width != width || canvas.height != height) {\n          this.oversampling_ = oversampling;\n          canvas.width = width;\n          canvas.height = height;\n        } else {\n          if (this.renderedExtent_ && !equals(imageExtent, this.renderedExtent_)) {\n            context.clearRect(0, 0, width, height);\n          }\n          oversampling = this.oversampling_;\n        }\n      }\n\n      this.renderedTiles.length = 0;\n      /** @type {Array<number>} */\n      const zs = Object.keys(tilesToDrawByZ).map(Number);\n      zs.sort(function(a, b) {\n        if (a === z) {\n          return 1;\n        } else if (b === z) {\n          return -1;\n        } else {\n          return a > b ? 1 : a < b ? -1 : 0;\n        }\n      });\n      let currentResolution, currentScale, currentTilePixelSize, currentZ, i, ii;\n      let tileExtent, tileGutter, tilesToDraw, w, h;\n      for (i = 0, ii = zs.length; i < ii; ++i) {\n        currentZ = zs[i];\n        currentTilePixelSize = tileSource.getTilePixelSize(currentZ, pixelRatio, projection);\n        currentResolution = tileGrid.getResolution(currentZ);\n        currentScale = currentResolution / tileResolution;\n        tileGutter = tilePixelRatio * tileSource.getGutterForProjection(projection);\n        tilesToDraw = tilesToDrawByZ[currentZ];\n        for (const tileCoordKey in tilesToDraw) {\n          tile = tilesToDraw[tileCoordKey];\n          tileExtent = tileGrid.getTileCoordExtent(tile.getTileCoord(), tmpExtent);\n          x = (tileExtent[0] - imageExtent[0]) / tileResolution * tilePixelRatio / oversampling;\n          y = (imageExtent[3] - tileExtent[3]) / tileResolution * tilePixelRatio / oversampling;\n          w = currentTilePixelSize[0] * currentScale / oversampling;\n          h = currentTilePixelSize[1] * currentScale / oversampling;\n          this.drawTileImage(tile, frameState, layerState, x, y, w, h, tileGutter, z === currentZ);\n          this.renderedTiles.push(tile);\n        }\n      }\n\n      this.renderedRevision = sourceRevision;\n      this.renderedResolution = tileResolution * pixelRatio / tilePixelRatio * oversampling;\n      this.renderedExtent_ = imageExtent;\n    }\n\n    const scale = this.renderedResolution / viewResolution;\n    const transform = composeTransform(this.imageTransform_,\n      pixelRatio * size[0] / 2, pixelRatio * size[1] / 2,\n      scale, scale,\n      0,\n      (this.renderedExtent_[0] - viewCenter[0]) / this.renderedResolution * pixelRatio,\n      (viewCenter[1] - this.renderedExtent_[3]) / this.renderedResolution * pixelRatio);\n    composeTransform(this.coordinateToCanvasPixelTransform,\n      pixelRatio * size[0] / 2 - transform[4], pixelRatio * size[1] / 2 - transform[5],\n      pixelRatio / viewResolution, -pixelRatio / viewResolution,\n      0,\n      -viewCenter[0], -viewCenter[1]);\n\n\n    this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);\n    this.manageTilePyramid(frameState, tileSource, tileGrid, pixelRatio,\n      projection, extent, z, tileLayer.getPreload());\n    this.scheduleExpireCache(frameState, tileSource);\n\n    return this.renderedTiles.length > 0;\n  }\n\n  /**\n   * @param {module:ol/Tile} tile Tile.\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @param {module:ol/layer/Layer~State} layerState Layer state.\n   * @param {number} x Left of the tile.\n   * @param {number} y Top of the tile.\n   * @param {number} w Width of the tile.\n   * @param {number} h Height of the tile.\n   * @param {number} gutter Tile gutter.\n   * @param {boolean} transition Apply an alpha transition.\n   */\n  drawTileImage(tile, frameState, layerState, x, y, w, h, gutter, transition) {\n    const image = tile.getImage(this.getLayer());\n    if (!image) {\n      return;\n    }\n    const uid = getUid(this);\n    const alpha = transition ? tile.getAlpha(uid, frameState.time) : 1;\n    if (alpha === 1 && !this.getLayer().getSource().getOpaque(frameState.viewState.projection)) {\n      this.context.clearRect(x, y, w, h);\n    }\n    const alphaChanged = alpha !== this.context.globalAlpha;\n    if (alphaChanged) {\n      this.context.save();\n      this.context.globalAlpha = alpha;\n    }\n    this.context.drawImage(image, gutter, gutter,\n      image.width - 2 * gutter, image.height - 2 * gutter, x, y, w, h);\n\n    if (alphaChanged) {\n      this.context.restore();\n    }\n    if (alpha !== 1) {\n      frameState.animate = true;\n    } else if (transition) {\n      tile.endTransition(uid);\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getImage() {\n    const context = this.context;\n    return context ? context.canvas : null;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getImageTransform() {\n    return this.imageTransform_;\n  }\n}\n\n\n/**\n * Determine if this renderer handles the provided layer.\n * @param {module:ol/layer/Layer} layer The candidate layer.\n * @return {boolean} The renderer can render the layer.\n */\nCanvasTileLayerRenderer['handles'] = function(layer) {\n  return layer.getType() === LayerType.TILE;\n};\n\n\n/**\n * Create a layer renderer.\n * @param {module:ol/renderer/Map} mapRenderer The map renderer.\n * @param {module:ol/layer/Layer} layer The layer to be rendererd.\n * @return {module:ol/renderer/canvas/TileLayer} The layer renderer.\n */\nCanvasTileLayerRenderer['create'] = function(mapRenderer, layer) {\n  return new CanvasTileLayerRenderer(/** @type {module:ol/layer/Tile} */ (layer));\n};\n\n\n/**\n * @function\n * @return {module:ol/layer/Tile|module:ol/layer/VectorTile}\n */\nCanvasTileLayerRenderer.prototype.getLayer;\n\n\nexport default CanvasTileLayerRenderer;\n","/**\n * @module ol/render/ReplayGroup\n */\n/**\n * Base class for replay groups.\n */\nclass ReplayGroup {\n  /**\n   * @abstract\n   * @param {number|undefined} zIndex Z index.\n   * @param {module:ol/render/ReplayType} replayType Replay type.\n   * @return {module:ol/render/VectorContext} Replay.\n   */\n  getReplay(zIndex, replayType) {}\n\n  /**\n   * @abstract\n   * @return {boolean} Is empty.\n   */\n  isEmpty() {}\n}\n\nexport default ReplayGroup;\n","/**\n * @module ol/render/ReplayType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  CIRCLE: 'Circle',\n  DEFAULT: 'Default',\n  IMAGE: 'Image',\n  LINE_STRING: 'LineString',\n  POLYGON: 'Polygon',\n  TEXT: 'Text'\n};\n","/**\n * @module ol/geom/flat/textpath\n */\nimport {lerp} from '../../math.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Path to put text on.\n * @param {number} offset Start offset of the `flatCoordinates`.\n * @param {number} end End offset of the `flatCoordinates`.\n * @param {number} stride Stride.\n * @param {string} text Text to place on the path.\n * @param {function(string):number} measure Measure function returning the\n * width of the character passed as 1st argument.\n * @param {number} startM m along the path where the text starts.\n * @param {number} maxAngle Max angle between adjacent chars in radians.\n * @return {Array<Array<*>>} The result array of null if `maxAngle` was\n * exceeded. Entries of the array are x, y, anchorX, angle, chunk.\n */\nexport function drawTextOnPath(\n  flatCoordinates, offset, end, stride, text, measure, startM, maxAngle) {\n  const result = [];\n\n  // Keep text upright\n  const reverse = flatCoordinates[offset] > flatCoordinates[end - stride];\n\n  const numChars = text.length;\n\n  let x1 = flatCoordinates[offset];\n  let y1 = flatCoordinates[offset + 1];\n  offset += stride;\n  let x2 = flatCoordinates[offset];\n  let y2 = flatCoordinates[offset + 1];\n  let segmentM = 0;\n  let segmentLength = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));\n\n  let chunk = '';\n  let chunkLength = 0;\n  let data, index, previousAngle;\n  for (let i = 0; i < numChars; ++i) {\n    index = reverse ? numChars - i - 1 : i;\n    const char = text.charAt(index);\n    chunk = reverse ? char + chunk : chunk + char;\n    const charLength = measure(chunk) - chunkLength;\n    chunkLength += charLength;\n    const charM = startM + charLength / 2;\n    while (offset < end - stride && segmentM + segmentLength < charM) {\n      x1 = x2;\n      y1 = y2;\n      offset += stride;\n      x2 = flatCoordinates[offset];\n      y2 = flatCoordinates[offset + 1];\n      segmentM += segmentLength;\n      segmentLength = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));\n    }\n    const segmentPos = charM - segmentM;\n    let angle = Math.atan2(y2 - y1, x2 - x1);\n    if (reverse) {\n      angle += angle > 0 ? -Math.PI : Math.PI;\n    }\n    if (previousAngle !== undefined) {\n      let delta = angle - previousAngle;\n      delta += (delta > Math.PI) ? -2 * Math.PI : (delta < -Math.PI) ? 2 * Math.PI : 0;\n      if (Math.abs(delta) > maxAngle) {\n        return null;\n      }\n    }\n    const interpolate = segmentPos / segmentLength;\n    const x = lerp(x1, x2, interpolate);\n    const y = lerp(y1, y2, interpolate);\n    if (previousAngle == angle) {\n      if (reverse) {\n        data[0] = x;\n        data[1] = y;\n        data[2] = charLength / 2;\n      }\n      data[4] = chunk;\n    } else {\n      chunk = char;\n      chunkLength = charLength;\n      data = [x, y, charLength / 2, angle, chunk];\n      if (reverse) {\n        result.unshift(data);\n      } else {\n        result.push(data);\n      }\n      previousAngle = angle;\n    }\n    startM += charLength;\n  }\n  return result;\n}\n","/**\n * @module ol/render/canvas/Instruction\n */\n\n/**\n * @enum {number}\n */\nconst Instruction = {\n  BEGIN_GEOMETRY: 0,\n  BEGIN_PATH: 1,\n  CIRCLE: 2,\n  CLOSE_PATH: 3,\n  CUSTOM: 4,\n  DRAW_CHARS: 5,\n  DRAW_IMAGE: 6,\n  END_GEOMETRY: 7,\n  FILL: 8,\n  MOVE_TO_LINE_TO: 9,\n  SET_FILL_STYLE: 10,\n  SET_STROKE_STYLE: 11,\n  STROKE: 12\n};\n\n\n/**\n * @type {Array<Instruction>}\n */\nexport const fillInstruction = [Instruction.FILL];\n\n\n/**\n * @type {Array<Instruction>}\n */\nexport const strokeInstruction = [Instruction.STROKE];\n\n\n/**\n * @type {Array<Instruction>}\n */\nexport const beginPathInstruction = [Instruction.BEGIN_PATH];\n\n\n/**\n * @type {Array<Instruction>}\n */\nexport const closePathInstruction = [Instruction.CLOSE_PATH];\n\n\nexport default Instruction;\n","/**\n * @module ol/render/replay\n */\nimport ReplayType from '../render/ReplayType.js';\n\n\n/**\n * @const\n * @type {Array<module:ol/render/ReplayType>}\n */\nexport const ORDER = [\n  ReplayType.POLYGON,\n  ReplayType.CIRCLE,\n  ReplayType.LINE_STRING,\n  ReplayType.IMAGE,\n  ReplayType.TEXT,\n  ReplayType.DEFAULT\n];\n\n/**\n * @const\n * @enum {number}\n */\nexport const TEXT_ALIGN = {};\nTEXT_ALIGN['left'] = 0;\nTEXT_ALIGN['end'] = 0;\nTEXT_ALIGN['center'] = 0.5;\nTEXT_ALIGN['right'] = 1;\nTEXT_ALIGN['start'] = 1;\nTEXT_ALIGN['top'] = 0;\nTEXT_ALIGN['middle'] = 0.5;\nTEXT_ALIGN['hanging'] = 0.2;\nTEXT_ALIGN['alphabetic'] = 0.8;\nTEXT_ALIGN['ideographic'] = 0.8;\nTEXT_ALIGN['bottom'] = 1;\n","/**\n * @module ol/render/canvas/Replay\n */\nimport {getUid} from '../../util.js';\nimport {VOID} from '../../functions.js';\nimport {equals, reverseSubArray} from '../../array.js';\nimport {asColorLike} from '../../colorlike.js';\nimport {buffer, clone, coordinateRelationship, createEmpty, createOrUpdate,\n  createOrUpdateEmpty, extend, extendCoordinate, intersects} from '../../extent.js';\nimport Relationship from '../../extent/Relationship.js';\nimport GeometryType from '../../geom/GeometryType.js';\nimport {inflateCoordinates, inflateCoordinatesArray, inflateMultiCoordinatesArray} from '../../geom/flat/inflate.js';\nimport {lineStringLength} from '../../geom/flat/length.js';\nimport {drawTextOnPath} from '../../geom/flat/textpath.js';\nimport {transform2D} from '../../geom/flat/transform.js';\nimport {CANVAS_LINE_DASH} from '../../has.js';\nimport {isEmpty} from '../../obj.js';\nimport VectorContext from '../VectorContext.js';\nimport {drawImage, resetTransform, defaultPadding, defaultFillStyle, defaultStrokeStyle,\n  defaultMiterLimit, defaultLineWidth, defaultLineJoin, defaultLineDashOffset,\n  defaultLineDash, defaultLineCap} from '../canvas.js';\nimport CanvasInstruction from '../canvas/Instruction.js';\nimport {TEXT_ALIGN} from '../replay.js';\nimport {\n  create as createTransform,\n  compose as composeTransform,\n  apply as applyTransform,\n  setFromArray as transformSetFromArray\n} from '../../transform.js';\n\n\n/**\n * @type {module:ol/extent~Extent}\n */\nconst tmpExtent = createEmpty();\n\n\n/**\n * @type {!module:ol/transform~Transform}\n */\nconst tmpTransform = createTransform();\n\n\nclass CanvasReplay extends VectorContext {\n  /**\n   * @param {number} tolerance Tolerance.\n   * @param {module:ol/extent~Extent} maxExtent Maximum extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {boolean} overlaps The replay can have overlapping geometries.\n   * @param {?} declutterTree Declutter tree.\n   */\n  constructor(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree) {\n    super();\n\n    /**\n     * @type {?}\n     */\n    this.declutterTree = declutterTree;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.tolerance = tolerance;\n\n    /**\n     * @protected\n     * @const\n     * @type {module:ol/extent~Extent}\n     */\n    this.maxExtent = maxExtent;\n\n    /**\n     * @protected\n     * @type {boolean}\n     */\n    this.overlaps = overlaps;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.pixelRatio = pixelRatio;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.maxLineWidth = 0;\n\n    /**\n     * @protected\n     * @const\n     * @type {number}\n     */\n    this.resolution = resolution;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.alignFill_;\n\n    /**\n     * @private\n     * @type {Array<*>}\n     */\n    this.beginGeometryInstruction1_ = null;\n\n    /**\n     * @private\n     * @type {Array<*>}\n     */\n    this.beginGeometryInstruction2_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/extent~Extent}\n     */\n    this.bufferedMaxExtent_ = null;\n\n    /**\n     * @protected\n     * @type {Array<*>}\n     */\n    this.instructions = [];\n\n    /**\n     * @protected\n     * @type {Array<number>}\n     */\n    this.coordinates = [];\n\n    /**\n     * @private\n     * @type {!Object<number,module:ol/coordinate~Coordinate|Array<module:ol/coordinate~Coordinate>|Array<Array<module:ol/coordinate~Coordinate>>>}\n     */\n    this.coordinateCache_ = {};\n\n    /**\n     * @private\n     * @type {!module:ol/transform~Transform}\n     */\n    this.renderedTransform_ = createTransform();\n\n    /**\n     * @protected\n     * @type {Array<*>}\n     */\n    this.hitDetectionInstructions = [];\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.pixelCoordinates_ = null;\n\n    /**\n     * @protected\n     * @type {module:ol/render/canvas~FillStrokeState}\n     */\n    this.state = /** @type {module:ol/render/canvas~FillStrokeState} */ ({});\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.viewRotation_ = 0;\n\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {module:ol/coordinate~Coordinate} p1 1st point of the background box.\n   * @param {module:ol/coordinate~Coordinate} p2 2nd point of the background box.\n   * @param {module:ol/coordinate~Coordinate} p3 3rd point of the background box.\n   * @param {module:ol/coordinate~Coordinate} p4 4th point of the background box.\n   * @param {Array<*>} fillInstruction Fill instruction.\n   * @param {Array<*>} strokeInstruction Stroke instruction.\n   */\n  replayTextBackground_(context, p1, p2, p3, p4, fillInstruction, strokeInstruction) {\n    context.beginPath();\n    context.moveTo.apply(context, p1);\n    context.lineTo.apply(context, p2);\n    context.lineTo.apply(context, p3);\n    context.lineTo.apply(context, p4);\n    context.lineTo.apply(context, p1);\n    if (fillInstruction) {\n      this.alignFill_ = /** @type {boolean} */ (fillInstruction[2]);\n      this.fill_(context);\n    }\n    if (strokeInstruction) {\n      this.setStrokeStyle_(context, /** @type {Array<*>} */ (strokeInstruction));\n      context.stroke();\n    }\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {number} x X.\n   * @param {number} y Y.\n   * @param {HTMLImageElement|HTMLCanvasElement|HTMLVideoElement} image Image.\n   * @param {number} anchorX Anchor X.\n   * @param {number} anchorY Anchor Y.\n   * @param {module:ol/render/canvas~DeclutterGroup} declutterGroup Declutter group.\n   * @param {number} height Height.\n   * @param {number} opacity Opacity.\n   * @param {number} originX Origin X.\n   * @param {number} originY Origin Y.\n   * @param {number} rotation Rotation.\n   * @param {number} scale Scale.\n   * @param {boolean} snapToPixel Snap to pixel.\n   * @param {number} width Width.\n   * @param {Array<number>} padding Padding.\n   * @param {Array<*>} fillInstruction Fill instruction.\n   * @param {Array<*>} strokeInstruction Stroke instruction.\n   */\n  replayImage_(\n    context,\n    x,\n    y,\n    image,\n    anchorX,\n    anchorY,\n    declutterGroup,\n    height,\n    opacity,\n    originX,\n    originY,\n    rotation,\n    scale,\n    snapToPixel,\n    width,\n    padding,\n    fillInstruction,\n    strokeInstruction\n  ) {\n    const fillStroke = fillInstruction || strokeInstruction;\n    anchorX *= scale;\n    anchorY *= scale;\n    x -= anchorX;\n    y -= anchorY;\n\n    const w = (width + originX > image.width) ? image.width - originX : width;\n    const h = (height + originY > image.height) ? image.height - originY : height;\n    const boxW = padding[3] + w * scale + padding[1];\n    const boxH = padding[0] + h * scale + padding[2];\n    const boxX = x - padding[3];\n    const boxY = y - padding[0];\n\n    /** @type {module:ol/coordinate~Coordinate} */\n    let p1;\n    /** @type {module:ol/coordinate~Coordinate} */\n    let p2;\n    /** @type {module:ol/coordinate~Coordinate} */\n    let p3;\n    /** @type {module:ol/coordinate~Coordinate} */\n    let p4;\n    if (fillStroke || rotation !== 0) {\n      p1 = [boxX, boxY];\n      p2 = [boxX + boxW, boxY];\n      p3 = [boxX + boxW, boxY + boxH];\n      p4 = [boxX, boxY + boxH];\n    }\n\n    let transform = null;\n    if (rotation !== 0) {\n      const centerX = x + anchorX;\n      const centerY = y + anchorY;\n      transform = composeTransform(tmpTransform, centerX, centerY, 1, 1, rotation, -centerX, -centerY);\n\n      createOrUpdateEmpty(tmpExtent);\n      extendCoordinate(tmpExtent, applyTransform(tmpTransform, p1));\n      extendCoordinate(tmpExtent, applyTransform(tmpTransform, p2));\n      extendCoordinate(tmpExtent, applyTransform(tmpTransform, p3));\n      extendCoordinate(tmpExtent, applyTransform(tmpTransform, p4));\n    } else {\n      createOrUpdate(boxX, boxY, boxX + boxW, boxY + boxH, tmpExtent);\n    }\n    const canvas = context.canvas;\n    const strokePadding = strokeInstruction ? (strokeInstruction[2] * scale / 2) : 0;\n    const intersects =\n        tmpExtent[0] - strokePadding <= canvas.width && tmpExtent[2] + strokePadding >= 0 &&\n        tmpExtent[1] - strokePadding <= canvas.height && tmpExtent[3] + strokePadding >= 0;\n\n    if (snapToPixel) {\n      x = Math.round(x);\n      y = Math.round(y);\n    }\n\n    if (declutterGroup) {\n      if (!intersects && declutterGroup[4] == 1) {\n        return;\n      }\n      extend(declutterGroup, tmpExtent);\n      const declutterArgs = intersects ?\n        [context, transform ? transform.slice(0) : null, opacity, image, originX, originY, w, h, x, y, scale] :\n        null;\n      if (declutterArgs && fillStroke) {\n        declutterArgs.push(fillInstruction, strokeInstruction, p1, p2, p3, p4);\n      }\n      declutterGroup.push(declutterArgs);\n    } else if (intersects) {\n      if (fillStroke) {\n        this.replayTextBackground_(context, p1, p2, p3, p4,\n          /** @type {Array<*>} */ (fillInstruction),\n          /** @type {Array<*>} */ (strokeInstruction));\n      }\n      drawImage(context, transform, opacity, image, originX, originY, w, h, x, y, scale);\n    }\n  }\n\n  /**\n   * @protected\n   * @param {Array<number>} dashArray Dash array.\n   * @return {Array<number>} Dash array with pixel ratio applied\n   */\n  applyPixelRatio(dashArray) {\n    const pixelRatio = this.pixelRatio;\n    return pixelRatio == 1 ? dashArray : dashArray.map(function(dash) {\n      return dash * pixelRatio;\n    });\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {number} end End.\n   * @param {number} stride Stride.\n   * @param {boolean} closed Last input coordinate equals first.\n   * @param {boolean} skipFirst Skip first coordinate.\n   * @protected\n   * @return {number} My end.\n   */\n  appendFlatCoordinates(flatCoordinates, offset, end, stride, closed, skipFirst) {\n\n    let myEnd = this.coordinates.length;\n    const extent = this.getBufferedMaxExtent();\n    if (skipFirst) {\n      offset += stride;\n    }\n    const lastCoord = [flatCoordinates[offset], flatCoordinates[offset + 1]];\n    const nextCoord = [NaN, NaN];\n    let skipped = true;\n\n    let i, lastRel, nextRel;\n    for (i = offset + stride; i < end; i += stride) {\n      nextCoord[0] = flatCoordinates[i];\n      nextCoord[1] = flatCoordinates[i + 1];\n      nextRel = coordinateRelationship(extent, nextCoord);\n      if (nextRel !== lastRel) {\n        if (skipped) {\n          this.coordinates[myEnd++] = lastCoord[0];\n          this.coordinates[myEnd++] = lastCoord[1];\n        }\n        this.coordinates[myEnd++] = nextCoord[0];\n        this.coordinates[myEnd++] = nextCoord[1];\n        skipped = false;\n      } else if (nextRel === Relationship.INTERSECTING) {\n        this.coordinates[myEnd++] = nextCoord[0];\n        this.coordinates[myEnd++] = nextCoord[1];\n        skipped = false;\n      } else {\n        skipped = true;\n      }\n      lastCoord[0] = nextCoord[0];\n      lastCoord[1] = nextCoord[1];\n      lastRel = nextRel;\n    }\n\n    // Last coordinate equals first or only one point to append:\n    if ((closed && skipped) || i === offset + stride) {\n      this.coordinates[myEnd++] = lastCoord[0];\n      this.coordinates[myEnd++] = lastCoord[1];\n    }\n    return myEnd;\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {Array<number>} ends Ends.\n   * @param {number} stride Stride.\n   * @param {Array<number>} replayEnds Replay ends.\n   * @return {number} Offset.\n   */\n  drawCustomCoordinates_(flatCoordinates, offset, ends, stride, replayEnds) {\n    for (let i = 0, ii = ends.length; i < ii; ++i) {\n      const end = ends[i];\n      const replayEnd = this.appendFlatCoordinates(flatCoordinates, offset, end, stride, false, false);\n      replayEnds.push(replayEnd);\n      offset = end;\n    }\n    return offset;\n  }\n\n  /**\n   * @inheritDoc.\n   */\n  drawCustom(geometry, feature, renderer) {\n    this.beginGeometry(geometry, feature);\n    const type = geometry.getType();\n    const stride = geometry.getStride();\n    const replayBegin = this.coordinates.length;\n    let flatCoordinates, replayEnd, replayEnds, replayEndss;\n    let offset;\n    if (type == GeometryType.MULTI_POLYGON) {\n      geometry = /** @type {module:ol/geom/MultiPolygon} */ (geometry);\n      flatCoordinates = geometry.getOrientedFlatCoordinates();\n      replayEndss = [];\n      const endss = geometry.getEndss();\n      offset = 0;\n      for (let i = 0, ii = endss.length; i < ii; ++i) {\n        const myEnds = [];\n        offset = this.drawCustomCoordinates_(flatCoordinates, offset, endss[i], stride, myEnds);\n        replayEndss.push(myEnds);\n      }\n      this.instructions.push([CanvasInstruction.CUSTOM,\n        replayBegin, replayEndss, geometry, renderer, inflateMultiCoordinatesArray]);\n    } else if (type == GeometryType.POLYGON || type == GeometryType.MULTI_LINE_STRING) {\n      replayEnds = [];\n      flatCoordinates = (type == GeometryType.POLYGON) ?\n        /** @type {module:ol/geom/Polygon} */ (geometry).getOrientedFlatCoordinates() :\n        geometry.getFlatCoordinates();\n      offset = this.drawCustomCoordinates_(flatCoordinates, 0,\n        /** @type {module:ol/geom/Polygon|module:ol/geom/MultiLineString} */ (geometry).getEnds(),\n        stride, replayEnds);\n      this.instructions.push([CanvasInstruction.CUSTOM,\n        replayBegin, replayEnds, geometry, renderer, inflateCoordinatesArray]);\n    } else if (type == GeometryType.LINE_STRING || type == GeometryType.MULTI_POINT) {\n      flatCoordinates = geometry.getFlatCoordinates();\n      replayEnd = this.appendFlatCoordinates(\n        flatCoordinates, 0, flatCoordinates.length, stride, false, false);\n      this.instructions.push([CanvasInstruction.CUSTOM,\n        replayBegin, replayEnd, geometry, renderer, inflateCoordinates]);\n    } else if (type == GeometryType.POINT) {\n      flatCoordinates = geometry.getFlatCoordinates();\n      this.coordinates.push(flatCoordinates[0], flatCoordinates[1]);\n      replayEnd = this.coordinates.length;\n      this.instructions.push([CanvasInstruction.CUSTOM,\n        replayBegin, replayEnd, geometry, renderer]);\n    }\n    this.endGeometry(geometry, feature);\n  }\n\n  /**\n   * @protected\n   * @param {module:ol/geom/Geometry|module:ol/render/Feature} geometry Geometry.\n   * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n   */\n  beginGeometry(geometry, feature) {\n    this.beginGeometryInstruction1_ = [CanvasInstruction.BEGIN_GEOMETRY, feature, 0];\n    this.instructions.push(this.beginGeometryInstruction1_);\n    this.beginGeometryInstruction2_ = [CanvasInstruction.BEGIN_GEOMETRY, feature, 0];\n    this.hitDetectionInstructions.push(this.beginGeometryInstruction2_);\n  }\n\n  /**\n   * @private\n   * @param {CanvasRenderingContext2D} context Context.\n   */\n  fill_(context) {\n    if (this.alignFill_) {\n      const origin = applyTransform(this.renderedTransform_, [0, 0]);\n      const repeatSize = 512 * this.pixelRatio;\n      context.translate(origin[0] % repeatSize, origin[1] % repeatSize);\n      context.rotate(this.viewRotation_);\n    }\n    context.fill();\n    if (this.alignFill_) {\n      context.setTransform.apply(context, resetTransform);\n    }\n  }\n\n  /**\n   * @private\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {Array<*>} instruction Instruction.\n   */\n  setStrokeStyle_(context, instruction) {\n    context.strokeStyle = /** @type {module:ol/colorlike~ColorLike} */ (instruction[1]);\n    context.lineWidth = /** @type {number} */ (instruction[2]);\n    context.lineCap = /** @type {string} */ (instruction[3]);\n    context.lineJoin = /** @type {string} */ (instruction[4]);\n    context.miterLimit = /** @type {number} */ (instruction[5]);\n    if (CANVAS_LINE_DASH) {\n      context.lineDashOffset = /** @type {number} */ (instruction[7]);\n      context.setLineDash(/** @type {Array<number>} */ (instruction[6]));\n    }\n  }\n\n  /**\n   * @param {module:ol/render/canvas~DeclutterGroup} declutterGroup Declutter group.\n   * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n   */\n  renderDeclutter_(declutterGroup, feature) {\n    if (declutterGroup && declutterGroup.length > 5) {\n      const groupCount = declutterGroup[4];\n      if (groupCount == 1 || groupCount == declutterGroup.length - 5) {\n        /** @type {module:ol/structs/RBush~Entry} */\n        const box = {\n          minX: /** @type {number} */ (declutterGroup[0]),\n          minY: /** @type {number} */ (declutterGroup[1]),\n          maxX: /** @type {number} */ (declutterGroup[2]),\n          maxY: /** @type {number} */ (declutterGroup[3]),\n          value: feature\n        };\n        if (!this.declutterTree.collides(box)) {\n          this.declutterTree.insert(box);\n          for (let j = 5, jj = declutterGroup.length; j < jj; ++j) {\n            const declutterData = /** @type {Array} */ (declutterGroup[j]);\n            if (declutterData) {\n              if (declutterData.length > 11) {\n                this.replayTextBackground_(declutterData[0],\n                  declutterData[13], declutterData[14], declutterData[15], declutterData[16],\n                  declutterData[11], declutterData[12]);\n              }\n              drawImage.apply(undefined, declutterData);\n            }\n          }\n        }\n        declutterGroup.length = 5;\n        createOrUpdateEmpty(declutterGroup);\n      }\n    }\n  }\n\n  /**\n   * @private\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {module:ol/transform~Transform} transform Transform.\n   * @param {Object<string, boolean>} skippedFeaturesHash Ids of features\n   *     to skip.\n   * @param {Array<*>} instructions Instructions array.\n   * @param {boolean} snapToPixel Snap point symbols and text to integer pixels.\n   * @param {function((module:ol/Feature|module:ol/render/Feature)): T|undefined} featureCallback Feature callback.\n   * @param {module:ol/extent~Extent=} opt_hitExtent Only check features that intersect this\n   *     extent.\n   * @return {T|undefined} Callback result.\n   * @template T\n   */\n  replay_(\n    context,\n    transform,\n    skippedFeaturesHash,\n    instructions,\n    snapToPixel,\n    featureCallback,\n    opt_hitExtent\n  ) {\n    /** @type {Array<number>} */\n    let pixelCoordinates;\n    if (this.pixelCoordinates_ && equals(transform, this.renderedTransform_)) {\n      pixelCoordinates = this.pixelCoordinates_;\n    } else {\n      if (!this.pixelCoordinates_) {\n        this.pixelCoordinates_ = [];\n      }\n      pixelCoordinates = transform2D(\n        this.coordinates, 0, this.coordinates.length, 2,\n        transform, this.pixelCoordinates_);\n      transformSetFromArray(this.renderedTransform_, transform);\n    }\n    const skipFeatures = !isEmpty(skippedFeaturesHash);\n    let i = 0; // instruction index\n    const ii = instructions.length; // end of instructions\n    let d = 0; // data index\n    let dd; // end of per-instruction data\n    let anchorX, anchorY, prevX, prevY, roundX, roundY, declutterGroup, image;\n    let pendingFill = 0;\n    let pendingStroke = 0;\n    let lastFillInstruction = null;\n    let lastStrokeInstruction = null;\n    const coordinateCache = this.coordinateCache_;\n    const viewRotation = this.viewRotation_;\n\n    const state = /** @type {module:ol/render~State} */ ({\n      context: context,\n      pixelRatio: this.pixelRatio,\n      resolution: this.resolution,\n      rotation: viewRotation\n    });\n\n    // When the batch size gets too big, performance decreases. 200 is a good\n    // balance between batch size and number of fill/stroke instructions.\n    const batchSize = this.instructions != instructions || this.overlaps ? 0 : 200;\n    let /** @type {module:ol/Feature|module:ol/render/Feature} */ feature;\n    let x, y;\n    while (i < ii) {\n      const instruction = instructions[i];\n      const type = /** @type {module:ol/render/canvas/Instruction} */ (instruction[0]);\n      switch (type) {\n        case CanvasInstruction.BEGIN_GEOMETRY:\n          feature = /** @type {module:ol/Feature|module:ol/render/Feature} */ (instruction[1]);\n          if ((skipFeatures &&\n              skippedFeaturesHash[getUid(feature).toString()]) ||\n              !feature.getGeometry()) {\n            i = /** @type {number} */ (instruction[2]);\n          } else if (opt_hitExtent !== undefined && !intersects(\n            opt_hitExtent, feature.getGeometry().getExtent())) {\n            i = /** @type {number} */ (instruction[2]) + 1;\n          } else {\n            ++i;\n          }\n          break;\n        case CanvasInstruction.BEGIN_PATH:\n          if (pendingFill > batchSize) {\n            this.fill_(context);\n            pendingFill = 0;\n          }\n          if (pendingStroke > batchSize) {\n            context.stroke();\n            pendingStroke = 0;\n          }\n          if (!pendingFill && !pendingStroke) {\n            context.beginPath();\n            prevX = prevY = NaN;\n          }\n          ++i;\n          break;\n        case CanvasInstruction.CIRCLE:\n          d = /** @type {number} */ (instruction[1]);\n          const x1 = pixelCoordinates[d];\n          const y1 = pixelCoordinates[d + 1];\n          const x2 = pixelCoordinates[d + 2];\n          const y2 = pixelCoordinates[d + 3];\n          const dx = x2 - x1;\n          const dy = y2 - y1;\n          const r = Math.sqrt(dx * dx + dy * dy);\n          context.moveTo(x1 + r, y1);\n          context.arc(x1, y1, r, 0, 2 * Math.PI, true);\n          ++i;\n          break;\n        case CanvasInstruction.CLOSE_PATH:\n          context.closePath();\n          ++i;\n          break;\n        case CanvasInstruction.CUSTOM:\n          d = /** @type {number} */ (instruction[1]);\n          dd = instruction[2];\n          const geometry = /** @type {module:ol/geom/SimpleGeometry} */ (instruction[3]);\n          const renderer = instruction[4];\n          const fn = instruction.length == 6 ? instruction[5] : undefined;\n          state.geometry = geometry;\n          state.feature = feature;\n          if (!(i in coordinateCache)) {\n            coordinateCache[i] = [];\n          }\n          const coords = coordinateCache[i];\n          if (fn) {\n            fn(pixelCoordinates, d, dd, 2, coords);\n          } else {\n            coords[0] = pixelCoordinates[d];\n            coords[1] = pixelCoordinates[d + 1];\n            coords.length = 2;\n          }\n          renderer(coords, state);\n          ++i;\n          break;\n        case CanvasInstruction.DRAW_IMAGE:\n          d = /** @type {number} */ (instruction[1]);\n          dd = /** @type {number} */ (instruction[2]);\n          image = /** @type {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement} */\n              (instruction[3]);\n          // Remaining arguments in DRAW_IMAGE are in alphabetical order\n          anchorX = /** @type {number} */ (instruction[4]);\n          anchorY = /** @type {number} */ (instruction[5]);\n          declutterGroup = featureCallback ? null : /** @type {module:ol/render/canvas~DeclutterGroup} */ (instruction[6]);\n          const height = /** @type {number} */ (instruction[7]);\n          const opacity = /** @type {number} */ (instruction[8]);\n          const originX = /** @type {number} */ (instruction[9]);\n          const originY = /** @type {number} */ (instruction[10]);\n          const rotateWithView = /** @type {boolean} */ (instruction[11]);\n          let rotation = /** @type {number} */ (instruction[12]);\n          const scale = /** @type {number} */ (instruction[13]);\n          const width = /** @type {number} */ (instruction[14]);\n\n          let padding, backgroundFill, backgroundStroke;\n          if (instruction.length > 16) {\n            padding = /** @type {Array<number>} */ (instruction[15]);\n            backgroundFill = /** @type {boolean} */ (instruction[16]);\n            backgroundStroke = /** @type {boolean} */ (instruction[17]);\n          } else {\n            padding = defaultPadding;\n            backgroundFill = backgroundStroke = false;\n          }\n\n          if (rotateWithView) {\n            rotation += viewRotation;\n          }\n          for (; d < dd; d += 2) {\n            this.replayImage_(context,\n              pixelCoordinates[d], pixelCoordinates[d + 1], image, anchorX, anchorY,\n              declutterGroup, height, opacity, originX, originY, rotation, scale,\n              snapToPixel, width, padding,\n              backgroundFill ? /** @type {Array<*>} */ (lastFillInstruction) : null,\n              backgroundStroke ? /** @type {Array<*>} */ (lastStrokeInstruction) : null);\n          }\n          this.renderDeclutter_(declutterGroup, feature);\n          ++i;\n          break;\n        case CanvasInstruction.DRAW_CHARS:\n          const begin = /** @type {number} */ (instruction[1]);\n          const end = /** @type {number} */ (instruction[2]);\n          const baseline = /** @type {number} */ (instruction[3]);\n          declutterGroup = featureCallback ? null : /** @type {module:ol/render/canvas~DeclutterGroup} */ (instruction[4]);\n          const overflow = /** @type {number} */ (instruction[5]);\n          const fillKey = /** @type {string} */ (instruction[6]);\n          const maxAngle = /** @type {number} */ (instruction[7]);\n          const measure = /** @type {function(string):number} */ (instruction[8]);\n          const offsetY = /** @type {number} */ (instruction[9]);\n          const strokeKey = /** @type {string} */ (instruction[10]);\n          const strokeWidth = /** @type {number} */ (instruction[11]);\n          const text = /** @type {string} */ (instruction[12]);\n          const textKey = /** @type {string} */ (instruction[13]);\n          const textScale = /** @type {number} */ (instruction[14]);\n\n          const pathLength = lineStringLength(pixelCoordinates, begin, end, 2);\n          const textLength = measure(text);\n          if (overflow || textLength <= pathLength) {\n            const textAlign = /** @type {module:ol~render} */ (this).textStates[textKey].textAlign;\n            const startM = (pathLength - textLength) * TEXT_ALIGN[textAlign];\n            const parts = drawTextOnPath(\n              pixelCoordinates, begin, end, 2, text, measure, startM, maxAngle);\n            if (parts) {\n              let c, cc, chars, label, part;\n              if (strokeKey) {\n                for (c = 0, cc = parts.length; c < cc; ++c) {\n                  part = parts[c]; // x, y, anchorX, rotation, chunk\n                  chars = /** @type {string} */ (part[4]);\n                  label = /** @type {module:ol~render} */ (this).getImage(chars, textKey, '', strokeKey);\n                  anchorX = /** @type {number} */ (part[2]) + strokeWidth;\n                  anchorY = baseline * label.height + (0.5 - baseline) * 2 * strokeWidth - offsetY;\n                  this.replayImage_(context,\n                    /** @type {number} */ (part[0]), /** @type {number} */ (part[1]), label,\n                    anchorX, anchorY, declutterGroup, label.height, 1, 0, 0,\n                    /** @type {number} */ (part[3]), textScale, false, label.width,\n                    defaultPadding, null, null);\n                }\n              }\n              if (fillKey) {\n                for (c = 0, cc = parts.length; c < cc; ++c) {\n                  part = parts[c]; // x, y, anchorX, rotation, chunk\n                  chars = /** @type {string} */ (part[4]);\n                  label = /** @type {module:ol~render} */ (this).getImage(chars, textKey, fillKey, '');\n                  anchorX = /** @type {number} */ (part[2]);\n                  anchorY = baseline * label.height - offsetY;\n                  this.replayImage_(context,\n                    /** @type {number} */ (part[0]), /** @type {number} */ (part[1]), label,\n                    anchorX, anchorY, declutterGroup, label.height, 1, 0, 0,\n                    /** @type {number} */ (part[3]), textScale, false, label.width,\n                    defaultPadding, null, null);\n                }\n              }\n            }\n          }\n          this.renderDeclutter_(declutterGroup, feature);\n          ++i;\n          break;\n        case CanvasInstruction.END_GEOMETRY:\n          if (featureCallback !== undefined) {\n            feature = /** @type {module:ol/Feature|module:ol/render/Feature} */ (instruction[1]);\n            const result = featureCallback(feature);\n            if (result) {\n              return result;\n            }\n          }\n          ++i;\n          break;\n        case CanvasInstruction.FILL:\n          if (batchSize) {\n            pendingFill++;\n          } else {\n            this.fill_(context);\n          }\n          ++i;\n          break;\n        case CanvasInstruction.MOVE_TO_LINE_TO:\n          d = /** @type {number} */ (instruction[1]);\n          dd = /** @type {number} */ (instruction[2]);\n          x = pixelCoordinates[d];\n          y = pixelCoordinates[d + 1];\n          roundX = (x + 0.5) | 0;\n          roundY = (y + 0.5) | 0;\n          if (roundX !== prevX || roundY !== prevY) {\n            context.moveTo(x, y);\n            prevX = roundX;\n            prevY = roundY;\n          }\n          for (d += 2; d < dd; d += 2) {\n            x = pixelCoordinates[d];\n            y = pixelCoordinates[d + 1];\n            roundX = (x + 0.5) | 0;\n            roundY = (y + 0.5) | 0;\n            if (d == dd - 2 || roundX !== prevX || roundY !== prevY) {\n              context.lineTo(x, y);\n              prevX = roundX;\n              prevY = roundY;\n            }\n          }\n          ++i;\n          break;\n        case CanvasInstruction.SET_FILL_STYLE:\n          lastFillInstruction = instruction;\n          this.alignFill_ = instruction[2];\n\n          if (pendingFill) {\n            this.fill_(context);\n            pendingFill = 0;\n            if (pendingStroke) {\n              context.stroke();\n              pendingStroke = 0;\n            }\n          }\n\n          context.fillStyle = /** @type {module:ol/colorlike~ColorLike} */ (instruction[1]);\n          ++i;\n          break;\n        case CanvasInstruction.SET_STROKE_STYLE:\n          lastStrokeInstruction = instruction;\n          if (pendingStroke) {\n            context.stroke();\n            pendingStroke = 0;\n          }\n          this.setStrokeStyle_(context, /** @type {Array<*>} */ (instruction));\n          ++i;\n          break;\n        case CanvasInstruction.STROKE:\n          if (batchSize) {\n            pendingStroke++;\n          } else {\n            context.stroke();\n          }\n          ++i;\n          break;\n        default:\n          ++i; // consume the instruction anyway, to avoid an infinite loop\n          break;\n      }\n    }\n    if (pendingFill) {\n      this.fill_(context);\n    }\n    if (pendingStroke) {\n      context.stroke();\n    }\n    return undefined;\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {module:ol/transform~Transform} transform Transform.\n   * @param {number} viewRotation View rotation.\n   * @param {Object<string, boolean>} skippedFeaturesHash Ids of features\n   *     to skip.\n   * @param {boolean} snapToPixel Snap point symbols and text to integer pixels.\n   */\n  replay(context, transform, viewRotation, skippedFeaturesHash, snapToPixel) {\n    this.viewRotation_ = viewRotation;\n    this.replay_(context, transform,\n      skippedFeaturesHash, this.instructions, snapToPixel, undefined, undefined);\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {module:ol/transform~Transform} transform Transform.\n   * @param {number} viewRotation View rotation.\n   * @param {Object<string, boolean>} skippedFeaturesHash Ids of features\n   *     to skip.\n   * @param {function((module:ol/Feature|module:ol/render/Feature)): T=} opt_featureCallback\n   *     Feature callback.\n   * @param {module:ol/extent~Extent=} opt_hitExtent Only check features that intersect this\n   *     extent.\n   * @return {T|undefined} Callback result.\n   * @template T\n   */\n  replayHitDetection(\n    context,\n    transform,\n    viewRotation,\n    skippedFeaturesHash,\n    opt_featureCallback,\n    opt_hitExtent\n  ) {\n    this.viewRotation_ = viewRotation;\n    return this.replay_(context, transform, skippedFeaturesHash,\n      this.hitDetectionInstructions, true, opt_featureCallback, opt_hitExtent);\n  }\n\n  /**\n   * Reverse the hit detection instructions.\n   */\n  reverseHitDetectionInstructions() {\n    const hitDetectionInstructions = this.hitDetectionInstructions;\n    // step 1 - reverse array\n    hitDetectionInstructions.reverse();\n    // step 2 - reverse instructions within geometry blocks\n    let i;\n    const n = hitDetectionInstructions.length;\n    let instruction;\n    let type;\n    let begin = -1;\n    for (i = 0; i < n; ++i) {\n      instruction = hitDetectionInstructions[i];\n      type = /** @type {module:ol/render/canvas/Instruction} */ (instruction[0]);\n      if (type == CanvasInstruction.END_GEOMETRY) {\n        begin = i;\n      } else if (type == CanvasInstruction.BEGIN_GEOMETRY) {\n        instruction[2] = i;\n        reverseSubArray(this.hitDetectionInstructions, begin, i);\n        begin = -1;\n      }\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setFillStrokeStyle(fillStyle, strokeStyle) {\n    const state = this.state;\n    if (fillStyle) {\n      const fillStyleColor = fillStyle.getColor();\n      state.fillStyle = asColorLike(fillStyleColor ?\n        fillStyleColor : defaultFillStyle);\n    } else {\n      state.fillStyle = undefined;\n    }\n    if (strokeStyle) {\n      const strokeStyleColor = strokeStyle.getColor();\n      state.strokeStyle = asColorLike(strokeStyleColor ?\n        strokeStyleColor : defaultStrokeStyle);\n      const strokeStyleLineCap = strokeStyle.getLineCap();\n      state.lineCap = strokeStyleLineCap !== undefined ?\n        strokeStyleLineCap : defaultLineCap;\n      const strokeStyleLineDash = strokeStyle.getLineDash();\n      state.lineDash = strokeStyleLineDash ?\n        strokeStyleLineDash.slice() : defaultLineDash;\n      const strokeStyleLineDashOffset = strokeStyle.getLineDashOffset();\n      state.lineDashOffset = strokeStyleLineDashOffset ?\n        strokeStyleLineDashOffset : defaultLineDashOffset;\n      const strokeStyleLineJoin = strokeStyle.getLineJoin();\n      state.lineJoin = strokeStyleLineJoin !== undefined ?\n        strokeStyleLineJoin : defaultLineJoin;\n      const strokeStyleWidth = strokeStyle.getWidth();\n      state.lineWidth = strokeStyleWidth !== undefined ?\n        strokeStyleWidth : defaultLineWidth;\n      const strokeStyleMiterLimit = strokeStyle.getMiterLimit();\n      state.miterLimit = strokeStyleMiterLimit !== undefined ?\n        strokeStyleMiterLimit : defaultMiterLimit;\n\n      if (state.lineWidth > this.maxLineWidth) {\n        this.maxLineWidth = state.lineWidth;\n        // invalidate the buffered max extent cache\n        this.bufferedMaxExtent_ = null;\n      }\n    } else {\n      state.strokeStyle = undefined;\n      state.lineCap = undefined;\n      state.lineDash = null;\n      state.lineDashOffset = undefined;\n      state.lineJoin = undefined;\n      state.lineWidth = undefined;\n      state.miterLimit = undefined;\n    }\n  }\n\n  /**\n   * @param {module:ol/render/canvas~FillStrokeState} state State.\n   * @param {module:ol/geom/Geometry|module:ol/render/Feature} geometry Geometry.\n   * @return {Array<*>} Fill instruction.\n   */\n  createFill(state, geometry) {\n    const fillStyle = state.fillStyle;\n    const fillInstruction = [CanvasInstruction.SET_FILL_STYLE, fillStyle];\n    if (typeof fillStyle !== 'string') {\n      // Fill is a pattern or gradient - align it!\n      fillInstruction.push(true);\n    }\n    return fillInstruction;\n  }\n\n  /**\n   * @param {module:ol/render/canvas~FillStrokeState} state State.\n   */\n  applyStroke(state) {\n    this.instructions.push(this.createStroke(state));\n  }\n\n  /**\n   * @param {module:ol/render/canvas~FillStrokeState} state State.\n   * @return {Array<*>} Stroke instruction.\n   */\n  createStroke(state) {\n    return [\n      CanvasInstruction.SET_STROKE_STYLE,\n      state.strokeStyle, state.lineWidth * this.pixelRatio, state.lineCap,\n      state.lineJoin, state.miterLimit,\n      this.applyPixelRatio(state.lineDash), state.lineDashOffset * this.pixelRatio\n    ];\n  }\n\n  /**\n   * @param {module:ol/render/canvas~FillStrokeState} state State.\n   * @param {function(this:module:ol/render/canvas/Replay, module:ol/render/canvas~FillStrokeState, (module:ol/geom/Geometry|module:ol/render/Feature)):Array<*>} createFill Create fill.\n   * @param {module:ol/geom/Geometry|module:ol/render/Feature} geometry Geometry.\n   */\n  updateFillStyle(state, createFill, geometry) {\n    const fillStyle = state.fillStyle;\n    if (typeof fillStyle !== 'string' || state.currentFillStyle != fillStyle) {\n      if (fillStyle !== undefined) {\n        this.instructions.push(createFill.call(this, state, geometry));\n      }\n      state.currentFillStyle = fillStyle;\n    }\n  }\n\n  /**\n   * @param {module:ol/render/canvas~FillStrokeState} state State.\n   * @param {function(this:module:ol/render/canvas/Replay, module:ol/render/canvas~FillStrokeState)} applyStroke Apply stroke.\n   */\n  updateStrokeStyle(state, applyStroke) {\n    const strokeStyle = state.strokeStyle;\n    const lineCap = state.lineCap;\n    const lineDash = state.lineDash;\n    const lineDashOffset = state.lineDashOffset;\n    const lineJoin = state.lineJoin;\n    const lineWidth = state.lineWidth;\n    const miterLimit = state.miterLimit;\n    if (state.currentStrokeStyle != strokeStyle ||\n        state.currentLineCap != lineCap ||\n        (lineDash != state.currentLineDash && !equals(state.currentLineDash, lineDash)) ||\n        state.currentLineDashOffset != lineDashOffset ||\n        state.currentLineJoin != lineJoin ||\n        state.currentLineWidth != lineWidth ||\n        state.currentMiterLimit != miterLimit) {\n      if (strokeStyle !== undefined) {\n        applyStroke.call(this, state);\n      }\n      state.currentStrokeStyle = strokeStyle;\n      state.currentLineCap = lineCap;\n      state.currentLineDash = lineDash;\n      state.currentLineDashOffset = lineDashOffset;\n      state.currentLineJoin = lineJoin;\n      state.currentLineWidth = lineWidth;\n      state.currentMiterLimit = miterLimit;\n    }\n  }\n\n  /**\n   * @param {module:ol/geom/Geometry|module:ol/render/Feature} geometry Geometry.\n   * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n   */\n  endGeometry(geometry, feature) {\n    this.beginGeometryInstruction1_[2] = this.instructions.length;\n    this.beginGeometryInstruction1_ = null;\n    this.beginGeometryInstruction2_[2] = this.hitDetectionInstructions.length;\n    this.beginGeometryInstruction2_ = null;\n    const endGeometryInstruction = [CanvasInstruction.END_GEOMETRY, feature];\n    this.instructions.push(endGeometryInstruction);\n    this.hitDetectionInstructions.push(endGeometryInstruction);\n  }\n\n  /**\n   * Get the buffered rendering extent.  Rendering will be clipped to the extent\n   * provided to the constructor.  To account for symbolizers that may intersect\n   * this extent, we calculate a buffered extent (e.g. based on stroke width).\n   * @return {module:ol/extent~Extent} The buffered rendering extent.\n   * @protected\n   */\n  getBufferedMaxExtent() {\n    if (!this.bufferedMaxExtent_) {\n      this.bufferedMaxExtent_ = clone(this.maxExtent);\n      if (this.maxLineWidth > 0) {\n        const width = this.resolution * (this.maxLineWidth + 1) / 2;\n        buffer(this.bufferedMaxExtent_, width, this.bufferedMaxExtent_);\n      }\n    }\n    return this.bufferedMaxExtent_;\n  }\n}\n\n\n/**\n * FIXME empty description for jsdoc\n */\nCanvasReplay.prototype.finish = VOID;\n\n\nexport default CanvasReplay;\n","/**\n * @module ol/render/canvas/ImageReplay\n */\nimport CanvasInstruction from '../canvas/Instruction.js';\nimport CanvasReplay from '../canvas/Replay.js';\n\nclass CanvasImageReplay extends CanvasReplay {\n  /**\n   * @param {number} tolerance Tolerance.\n   * @param {module:ol/extent~Extent} maxExtent Maximum extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {boolean} overlaps The replay can have overlapping geometries.\n   * @param {?} declutterTree Declutter tree.\n   */\n  constructor(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree) {\n    super(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree);\n\n    /**\n     * @private\n     * @type {module:ol/render/canvas~DeclutterGroup}\n     */\n    this.declutterGroup_ = null;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement}\n     */\n    this.hitDetectionImage_ = null;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement}\n     */\n    this.image_ = null;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.anchorX_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.anchorY_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.height_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.opacity_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.originX_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.originY_ = undefined;\n\n    /**\n     * @private\n     * @type {boolean|undefined}\n     */\n    this.rotateWithView_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.rotation_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.scale_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.width_ = undefined;\n\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {number} end End.\n   * @param {number} stride Stride.\n   * @private\n   * @return {number} My end.\n   */\n  drawCoordinates_(flatCoordinates, offset, end, stride) {\n    return this.appendFlatCoordinates(flatCoordinates, offset, end, stride, false, false);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawPoint(pointGeometry, feature) {\n    if (!this.image_) {\n      return;\n    }\n    this.beginGeometry(pointGeometry, feature);\n    const flatCoordinates = pointGeometry.getFlatCoordinates();\n    const stride = pointGeometry.getStride();\n    const myBegin = this.coordinates.length;\n    const myEnd = this.drawCoordinates_(flatCoordinates, 0, flatCoordinates.length, stride);\n    this.instructions.push([\n      CanvasInstruction.DRAW_IMAGE, myBegin, myEnd, this.image_,\n      // Remaining arguments to DRAW_IMAGE are in alphabetical order\n      this.anchorX_, this.anchorY_, this.declutterGroup_, this.height_, this.opacity_,\n      this.originX_, this.originY_, this.rotateWithView_, this.rotation_,\n      this.scale_ * this.pixelRatio, this.width_\n    ]);\n    this.hitDetectionInstructions.push([\n      CanvasInstruction.DRAW_IMAGE, myBegin, myEnd, this.hitDetectionImage_,\n      // Remaining arguments to DRAW_IMAGE are in alphabetical order\n      this.anchorX_, this.anchorY_, this.declutterGroup_, this.height_, this.opacity_,\n      this.originX_, this.originY_, this.rotateWithView_, this.rotation_,\n      this.scale_, this.width_\n    ]);\n    this.endGeometry(pointGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawMultiPoint(multiPointGeometry, feature) {\n    if (!this.image_) {\n      return;\n    }\n    this.beginGeometry(multiPointGeometry, feature);\n    const flatCoordinates = multiPointGeometry.getFlatCoordinates();\n    const stride = multiPointGeometry.getStride();\n    const myBegin = this.coordinates.length;\n    const myEnd = this.drawCoordinates_(\n      flatCoordinates, 0, flatCoordinates.length, stride);\n    this.instructions.push([\n      CanvasInstruction.DRAW_IMAGE, myBegin, myEnd, this.image_,\n      // Remaining arguments to DRAW_IMAGE are in alphabetical order\n      this.anchorX_, this.anchorY_, this.declutterGroup_, this.height_, this.opacity_,\n      this.originX_, this.originY_, this.rotateWithView_, this.rotation_,\n      this.scale_ * this.pixelRatio, this.width_\n    ]);\n    this.hitDetectionInstructions.push([\n      CanvasInstruction.DRAW_IMAGE, myBegin, myEnd, this.hitDetectionImage_,\n      // Remaining arguments to DRAW_IMAGE are in alphabetical order\n      this.anchorX_, this.anchorY_, this.declutterGroup_, this.height_, this.opacity_,\n      this.originX_, this.originY_, this.rotateWithView_, this.rotation_,\n      this.scale_, this.width_\n    ]);\n    this.endGeometry(multiPointGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  finish() {\n    this.reverseHitDetectionInstructions();\n    // FIXME this doesn't really protect us against further calls to draw*Geometry\n    this.anchorX_ = undefined;\n    this.anchorY_ = undefined;\n    this.hitDetectionImage_ = null;\n    this.image_ = null;\n    this.height_ = undefined;\n    this.scale_ = undefined;\n    this.opacity_ = undefined;\n    this.originX_ = undefined;\n    this.originY_ = undefined;\n    this.rotateWithView_ = undefined;\n    this.rotation_ = undefined;\n    this.width_ = undefined;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setImageStyle(imageStyle, declutterGroup) {\n    const anchor = imageStyle.getAnchor();\n    const size = imageStyle.getSize();\n    const hitDetectionImage = imageStyle.getHitDetectionImage(1);\n    const image = imageStyle.getImage(1);\n    const origin = imageStyle.getOrigin();\n    this.anchorX_ = anchor[0];\n    this.anchorY_ = anchor[1];\n    this.declutterGroup_ = /** @type {module:ol/render/canvas~DeclutterGroup} */ (declutterGroup);\n    this.hitDetectionImage_ = hitDetectionImage;\n    this.image_ = image;\n    this.height_ = size[1];\n    this.opacity_ = imageStyle.getOpacity();\n    this.originX_ = origin[0];\n    this.originY_ = origin[1];\n    this.rotateWithView_ = imageStyle.getRotateWithView();\n    this.rotation_ = imageStyle.getRotation();\n    this.scale_ = imageStyle.getScale();\n    this.width_ = size[0];\n  }\n}\n\n\nexport default CanvasImageReplay;\n","/**\n * @module ol/render/canvas/LineStringReplay\n */\nimport CanvasInstruction, {strokeInstruction, beginPathInstruction} from '../canvas/Instruction.js';\nimport CanvasReplay from '../canvas/Replay.js';\n\nclass CanvasLineStringReplay extends CanvasReplay {\n  /**\n   * @param {number} tolerance Tolerance.\n   * @param {module:ol/extent~Extent} maxExtent Maximum extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {boolean} overlaps The replay can have overlapping geometries.\n   * @param {?} declutterTree Declutter tree.\n   */\n  constructor(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree) {\n    super(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree);\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {number} end End.\n   * @param {number} stride Stride.\n   * @private\n   * @return {number} end.\n   */\n  drawFlatCoordinates_(flatCoordinates, offset, end, stride) {\n    const myBegin = this.coordinates.length;\n    const myEnd = this.appendFlatCoordinates(\n      flatCoordinates, offset, end, stride, false, false);\n    const moveToLineToInstruction = [CanvasInstruction.MOVE_TO_LINE_TO, myBegin, myEnd];\n    this.instructions.push(moveToLineToInstruction);\n    this.hitDetectionInstructions.push(moveToLineToInstruction);\n    return end;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawLineString(lineStringGeometry, feature) {\n    const state = this.state;\n    const strokeStyle = state.strokeStyle;\n    const lineWidth = state.lineWidth;\n    if (strokeStyle === undefined || lineWidth === undefined) {\n      return;\n    }\n    this.updateStrokeStyle(state, this.applyStroke);\n    this.beginGeometry(lineStringGeometry, feature);\n    this.hitDetectionInstructions.push([\n      CanvasInstruction.SET_STROKE_STYLE,\n      state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,\n      state.miterLimit, state.lineDash, state.lineDashOffset\n    ], beginPathInstruction);\n    const flatCoordinates = lineStringGeometry.getFlatCoordinates();\n    const stride = lineStringGeometry.getStride();\n    this.drawFlatCoordinates_(flatCoordinates, 0, flatCoordinates.length, stride);\n    this.hitDetectionInstructions.push(strokeInstruction);\n    this.endGeometry(lineStringGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawMultiLineString(multiLineStringGeometry, feature) {\n    const state = this.state;\n    const strokeStyle = state.strokeStyle;\n    const lineWidth = state.lineWidth;\n    if (strokeStyle === undefined || lineWidth === undefined) {\n      return;\n    }\n    this.updateStrokeStyle(state, this.applyStroke);\n    this.beginGeometry(multiLineStringGeometry, feature);\n    this.hitDetectionInstructions.push([\n      CanvasInstruction.SET_STROKE_STYLE,\n      state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,\n      state.miterLimit, state.lineDash, state.lineDashOffset\n    ], beginPathInstruction);\n    const ends = multiLineStringGeometry.getEnds();\n    const flatCoordinates = multiLineStringGeometry.getFlatCoordinates();\n    const stride = multiLineStringGeometry.getStride();\n    let offset = 0;\n    for (let i = 0, ii = ends.length; i < ii; ++i) {\n      offset = this.drawFlatCoordinates_(flatCoordinates, offset, ends[i], stride);\n    }\n    this.hitDetectionInstructions.push(strokeInstruction);\n    this.endGeometry(multiLineStringGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  finish() {\n    const state = this.state;\n    if (state.lastStroke != undefined && state.lastStroke != this.coordinates.length) {\n      this.instructions.push(strokeInstruction);\n    }\n    this.reverseHitDetectionInstructions();\n    this.state = null;\n  }\n\n  /**\n   * @inheritDoc.\n   */\n  applyStroke(state) {\n    if (state.lastStroke != undefined && state.lastStroke != this.coordinates.length) {\n      this.instructions.push(strokeInstruction);\n      state.lastStroke = this.coordinates.length;\n    }\n    state.lastStroke = 0;\n    super.applyStroke(state);\n    this.instructions.push(beginPathInstruction);\n  }\n}\n\n\nexport default CanvasLineStringReplay;\n","/**\n * @module ol/render/canvas/PolygonReplay\n */\nimport {asString} from '../../color.js';\nimport {snap} from '../../geom/flat/simplify.js';\nimport {defaultFillStyle} from '../canvas.js';\nimport CanvasInstruction, {\n  fillInstruction, strokeInstruction, beginPathInstruction, closePathInstruction\n} from '../canvas/Instruction.js';\nimport CanvasReplay from '../canvas/Replay.js';\n\n\nclass CanvasPolygonReplay extends CanvasReplay {\n  /**\n   * @param {number} tolerance Tolerance.\n   * @param {module:ol/extent~Extent} maxExtent Maximum extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {boolean} overlaps The replay can have overlapping geometries.\n   * @param {?} declutterTree Declutter tree.\n   */\n  constructor(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree) {\n    super(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree);\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {Array<number>} ends Ends.\n   * @param {number} stride Stride.\n   * @private\n   * @return {number} End.\n   */\n  drawFlatCoordinatess_(flatCoordinates, offset, ends, stride) {\n    const state = this.state;\n    const fill = state.fillStyle !== undefined;\n    const stroke = state.strokeStyle != undefined;\n    const numEnds = ends.length;\n    this.instructions.push(beginPathInstruction);\n    this.hitDetectionInstructions.push(beginPathInstruction);\n    for (let i = 0; i < numEnds; ++i) {\n      const end = ends[i];\n      const myBegin = this.coordinates.length;\n      const myEnd = this.appendFlatCoordinates(flatCoordinates, offset, end, stride, true, !stroke);\n      const moveToLineToInstruction = [CanvasInstruction.MOVE_TO_LINE_TO, myBegin, myEnd];\n      this.instructions.push(moveToLineToInstruction);\n      this.hitDetectionInstructions.push(moveToLineToInstruction);\n      if (stroke) {\n        // Performance optimization: only call closePath() when we have a stroke.\n        // Otherwise the ring is closed already (see appendFlatCoordinates above).\n        this.instructions.push(closePathInstruction);\n        this.hitDetectionInstructions.push(closePathInstruction);\n      }\n      offset = end;\n    }\n    if (fill) {\n      this.instructions.push(fillInstruction);\n      this.hitDetectionInstructions.push(fillInstruction);\n    }\n    if (stroke) {\n      this.instructions.push(strokeInstruction);\n      this.hitDetectionInstructions.push(strokeInstruction);\n    }\n    return offset;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawCircle(circleGeometry, feature) {\n    const state = this.state;\n    const fillStyle = state.fillStyle;\n    const strokeStyle = state.strokeStyle;\n    if (fillStyle === undefined && strokeStyle === undefined) {\n      return;\n    }\n    this.setFillStrokeStyles_(circleGeometry);\n    this.beginGeometry(circleGeometry, feature);\n    if (state.fillStyle !== undefined) {\n      this.hitDetectionInstructions.push([\n        CanvasInstruction.SET_FILL_STYLE,\n        asString(defaultFillStyle)\n      ]);\n    }\n    if (state.strokeStyle !== undefined) {\n      this.hitDetectionInstructions.push([\n        CanvasInstruction.SET_STROKE_STYLE,\n        state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,\n        state.miterLimit, state.lineDash, state.lineDashOffset\n      ]);\n    }\n    const flatCoordinates = circleGeometry.getFlatCoordinates();\n    const stride = circleGeometry.getStride();\n    const myBegin = this.coordinates.length;\n    this.appendFlatCoordinates(\n      flatCoordinates, 0, flatCoordinates.length, stride, false, false);\n    const circleInstruction = [CanvasInstruction.CIRCLE, myBegin];\n    this.instructions.push(beginPathInstruction, circleInstruction);\n    this.hitDetectionInstructions.push(beginPathInstruction, circleInstruction);\n    this.hitDetectionInstructions.push(fillInstruction);\n    if (state.fillStyle !== undefined) {\n      this.instructions.push(fillInstruction);\n    }\n    if (state.strokeStyle !== undefined) {\n      this.instructions.push(strokeInstruction);\n      this.hitDetectionInstructions.push(strokeInstruction);\n    }\n    this.endGeometry(circleGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawPolygon(polygonGeometry, feature) {\n    const state = this.state;\n    const fillStyle = state.fillStyle;\n    const strokeStyle = state.strokeStyle;\n    if (fillStyle === undefined && strokeStyle === undefined) {\n      return;\n    }\n    this.setFillStrokeStyles_(polygonGeometry);\n    this.beginGeometry(polygonGeometry, feature);\n    if (state.fillStyle !== undefined) {\n      this.hitDetectionInstructions.push([\n        CanvasInstruction.SET_FILL_STYLE,\n        asString(defaultFillStyle)\n      ]);\n    }\n    if (state.strokeStyle !== undefined) {\n      this.hitDetectionInstructions.push([\n        CanvasInstruction.SET_STROKE_STYLE,\n        state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,\n        state.miterLimit, state.lineDash, state.lineDashOffset\n      ]);\n    }\n    const ends = polygonGeometry.getEnds();\n    const flatCoordinates = polygonGeometry.getOrientedFlatCoordinates();\n    const stride = polygonGeometry.getStride();\n    this.drawFlatCoordinatess_(flatCoordinates, 0, ends, stride);\n    this.endGeometry(polygonGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawMultiPolygon(multiPolygonGeometry, feature) {\n    const state = this.state;\n    const fillStyle = state.fillStyle;\n    const strokeStyle = state.strokeStyle;\n    if (fillStyle === undefined && strokeStyle === undefined) {\n      return;\n    }\n    this.setFillStrokeStyles_(multiPolygonGeometry);\n    this.beginGeometry(multiPolygonGeometry, feature);\n    if (state.fillStyle !== undefined) {\n      this.hitDetectionInstructions.push([\n        CanvasInstruction.SET_FILL_STYLE,\n        asString(defaultFillStyle)\n      ]);\n    }\n    if (state.strokeStyle !== undefined) {\n      this.hitDetectionInstructions.push([\n        CanvasInstruction.SET_STROKE_STYLE,\n        state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,\n        state.miterLimit, state.lineDash, state.lineDashOffset\n      ]);\n    }\n    const endss = multiPolygonGeometry.getEndss();\n    const flatCoordinates = multiPolygonGeometry.getOrientedFlatCoordinates();\n    const stride = multiPolygonGeometry.getStride();\n    let offset = 0;\n    for (let i = 0, ii = endss.length; i < ii; ++i) {\n      offset = this.drawFlatCoordinatess_(flatCoordinates, offset, endss[i], stride);\n    }\n    this.endGeometry(multiPolygonGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  finish() {\n    this.reverseHitDetectionInstructions();\n    this.state = null;\n    // We want to preserve topology when drawing polygons.  Polygons are\n    // simplified using quantization and point elimination. However, we might\n    // have received a mix of quantized and non-quantized geometries, so ensure\n    // that all are quantized by quantizing all coordinates in the batch.\n    const tolerance = this.tolerance;\n    if (tolerance !== 0) {\n      const coordinates = this.coordinates;\n      for (let i = 0, ii = coordinates.length; i < ii; ++i) {\n        coordinates[i] = snap(coordinates[i], tolerance);\n      }\n    }\n  }\n\n  /**\n   * @private\n   * @param {module:ol/geom/Geometry|module:ol/render/Feature} geometry Geometry.\n   */\n  setFillStrokeStyles_(geometry) {\n    const state = this.state;\n    const fillStyle = state.fillStyle;\n    if (fillStyle !== undefined) {\n      this.updateFillStyle(state, this.createFill, geometry);\n    }\n    if (state.strokeStyle !== undefined) {\n      this.updateStrokeStyle(state, this.applyStroke);\n    }\n  }\n}\n\n\nexport default CanvasPolygonReplay;\n","/**\n * @module ol/geom/flat/straightchunk\n */\n\n\n/**\n * @param {number} maxAngle Maximum acceptable angle delta between segments.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @return {Array<number>} Start and end of the first suitable chunk of the\n * given `flatCoordinates`.\n */\nexport function matchingChunk(maxAngle, flatCoordinates, offset, end, stride) {\n  let chunkStart = offset;\n  let chunkEnd = offset;\n  let chunkM = 0;\n  let m = 0;\n  let start = offset;\n  let acos, i, m12, m23, x1, y1, x12, y12, x23, y23;\n  for (i = offset; i < end; i += stride) {\n    const x2 = flatCoordinates[i];\n    const y2 = flatCoordinates[i + 1];\n    if (x1 !== undefined) {\n      x23 = x2 - x1;\n      y23 = y2 - y1;\n      m23 = Math.sqrt(x23 * x23 + y23 * y23);\n      if (x12 !== undefined) {\n        m += m12;\n        acos = Math.acos((x12 * x23 + y12 * y23) / (m12 * m23));\n        if (acos > maxAngle) {\n          if (m > chunkM) {\n            chunkM = m;\n            chunkStart = start;\n            chunkEnd = i;\n          }\n          m = 0;\n          start = i - stride;\n        }\n      }\n      m12 = m23;\n      x12 = x23;\n      y12 = y23;\n    }\n    x1 = x2;\n    y1 = y2;\n  }\n  m += m23;\n  return m > chunkM ? [start, i] : [chunkStart, chunkEnd];\n}\n","/**\n * @module ol/render/canvas/TextReplay\n */\nimport {getUid} from '../../util.js';\nimport {asColorLike} from '../../colorlike.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {intersects} from '../../extent.js';\nimport {matchingChunk} from '../../geom/flat/straightchunk.js';\nimport GeometryType from '../../geom/GeometryType.js';\nimport {CANVAS_LINE_DASH} from '../../has.js';\nimport {labelCache, measureTextWidth, defaultTextAlign, measureTextHeight, defaultPadding, defaultLineCap, defaultLineDashOffset, defaultLineDash, defaultLineJoin, defaultFillStyle, checkFont, defaultFont, defaultLineWidth, defaultMiterLimit, defaultStrokeStyle, defaultTextBaseline} from '../canvas.js';\nimport CanvasInstruction from '../canvas/Instruction.js';\nimport CanvasReplay from '../canvas/Replay.js';\nimport {TEXT_ALIGN} from '../replay.js';\nimport TextPlacement from '../../style/TextPlacement.js';\n\nclass CanvasTextReplay extends CanvasReplay {\n  /**\n   * @param {number} tolerance Tolerance.\n   * @param {module:ol/extent~Extent} maxExtent Maximum extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {boolean} overlaps The replay can have overlapping geometries.\n   * @param {?} declutterTree Declutter tree.\n   */\n  constructor(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree) {\n    super(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree);\n\n    /**\n     * @private\n     * @type {module:ol/render/canvas~DeclutterGroup}\n     */\n    this.declutterGroup_;\n\n    /**\n     * @private\n     * @type {Array<HTMLCanvasElement>}\n     */\n    this.labels_ = null;\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.text_ = '';\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textOffsetX_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textOffsetY_ = 0;\n\n    /**\n     * @private\n     * @type {boolean|undefined}\n     */\n    this.textRotateWithView_ = undefined;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textRotation_ = 0;\n\n    /**\n     * @private\n     * @type {?module:ol/render/canvas~FillState}\n     */\n    this.textFillState_ = null;\n\n    /**\n     * @type {!Object<string, module:ol/render/canvas~FillState>}\n     */\n    this.fillStates = {};\n\n    /**\n     * @private\n     * @type {?module:ol/render/canvas~StrokeState}\n     */\n    this.textStrokeState_ = null;\n\n    /**\n     * @type {!Object<string, module:ol/render/canvas~StrokeState>}\n     */\n    this.strokeStates = {};\n\n    /**\n     * @private\n     * @type {module:ol/render/canvas~TextState}\n     */\n    this.textState_ = /** @type {module:ol/render/canvas~TextState} */ ({});\n\n    /**\n     * @type {!Object<string, module:ol/render/canvas~TextState>}\n     */\n    this.textStates = {};\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.textKey_ = '';\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.fillKey_ = '';\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.strokeKey_ = '';\n\n    /**\n     * @private\n     * @type {Object<string, Object<string, number>>}\n     */\n    this.widths_ = {};\n\n    labelCache.prune();\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawText(geometry, feature) {\n    const fillState = this.textFillState_;\n    const strokeState = this.textStrokeState_;\n    const textState = this.textState_;\n    if (this.text_ === '' || !textState || (!fillState && !strokeState)) {\n      return;\n    }\n\n    let begin = this.coordinates.length;\n\n    const geometryType = geometry.getType();\n    let flatCoordinates = null;\n    let end = 2;\n    let stride = 2;\n    let i, ii;\n\n    if (textState.placement === TextPlacement.LINE) {\n      if (!intersects(this.getBufferedMaxExtent(), geometry.getExtent())) {\n        return;\n      }\n      let ends;\n      flatCoordinates = geometry.getFlatCoordinates();\n      stride = geometry.getStride();\n      if (geometryType == GeometryType.LINE_STRING) {\n        ends = [flatCoordinates.length];\n      } else if (geometryType == GeometryType.MULTI_LINE_STRING) {\n        ends = geometry.getEnds();\n      } else if (geometryType == GeometryType.POLYGON) {\n        ends = geometry.getEnds().slice(0, 1);\n      } else if (geometryType == GeometryType.MULTI_POLYGON) {\n        const endss = geometry.getEndss();\n        ends = [];\n        for (i = 0, ii = endss.length; i < ii; ++i) {\n          ends.push(endss[i][0]);\n        }\n      }\n      this.beginGeometry(geometry, feature);\n      const textAlign = textState.textAlign;\n      let flatOffset = 0;\n      let flatEnd;\n      for (let o = 0, oo = ends.length; o < oo; ++o) {\n        if (textAlign == undefined) {\n          const range = matchingChunk(textState.maxAngle, flatCoordinates, flatOffset, ends[o], stride);\n          flatOffset = range[0];\n          flatEnd = range[1];\n        } else {\n          flatEnd = ends[o];\n        }\n        for (i = flatOffset; i < flatEnd; i += stride) {\n          this.coordinates.push(flatCoordinates[i], flatCoordinates[i + 1]);\n        }\n        end = this.coordinates.length;\n        flatOffset = ends[o];\n        this.drawChars_(begin, end, this.declutterGroup_);\n        begin = end;\n      }\n      this.endGeometry(geometry, feature);\n\n    } else {\n      const label = this.getImage(this.text_, this.textKey_, this.fillKey_, this.strokeKey_);\n      const width = label.width / this.pixelRatio;\n      switch (geometryType) {\n        case GeometryType.POINT:\n        case GeometryType.MULTI_POINT:\n          flatCoordinates = geometry.getFlatCoordinates();\n          end = flatCoordinates.length;\n          break;\n        case GeometryType.LINE_STRING:\n          flatCoordinates = /** @type {module:ol/geom/LineString} */ (geometry).getFlatMidpoint();\n          break;\n        case GeometryType.CIRCLE:\n          flatCoordinates = /** @type {module:ol/geom/Circle} */ (geometry).getCenter();\n          break;\n        case GeometryType.MULTI_LINE_STRING:\n          flatCoordinates = /** @type {module:ol/geom/MultiLineString} */ (geometry).getFlatMidpoints();\n          end = flatCoordinates.length;\n          break;\n        case GeometryType.POLYGON:\n          flatCoordinates = /** @type {module:ol/geom/Polygon} */ (geometry).getFlatInteriorPoint();\n          if (!textState.overflow && flatCoordinates[2] / this.resolution < width) {\n            return;\n          }\n          stride = 3;\n          break;\n        case GeometryType.MULTI_POLYGON:\n          const interiorPoints = /** @type {module:ol/geom/MultiPolygon} */ (geometry).getFlatInteriorPoints();\n          flatCoordinates = [];\n          for (i = 0, ii = interiorPoints.length; i < ii; i += 3) {\n            if (textState.overflow || interiorPoints[i + 2] / this.resolution >= width) {\n              flatCoordinates.push(interiorPoints[i], interiorPoints[i + 1]);\n            }\n          }\n          end = flatCoordinates.length;\n          if (end == 0) {\n            return;\n          }\n          break;\n        default:\n      }\n      end = this.appendFlatCoordinates(flatCoordinates, 0, end, stride, false, false);\n      if (textState.backgroundFill || textState.backgroundStroke) {\n        this.setFillStrokeStyle(textState.backgroundFill, textState.backgroundStroke);\n        if (textState.backgroundFill) {\n          this.updateFillStyle(this.state, this.createFill, geometry);\n          this.hitDetectionInstructions.push(this.createFill(this.state, geometry));\n        }\n        if (textState.backgroundStroke) {\n          this.updateStrokeStyle(this.state, this.applyStroke);\n          this.hitDetectionInstructions.push(this.createStroke(this.state));\n        }\n      }\n      this.beginGeometry(geometry, feature);\n      this.drawTextImage_(label, begin, end);\n      this.endGeometry(geometry, feature);\n    }\n  }\n\n  /**\n   * @param {string} text Text.\n   * @param {string} textKey Text style key.\n   * @param {string} fillKey Fill style key.\n   * @param {string} strokeKey Stroke style key.\n   * @return {HTMLCanvasElement} Image.\n   */\n  getImage(text, textKey, fillKey, strokeKey) {\n    let label;\n    const key = strokeKey + textKey + text + fillKey + this.pixelRatio;\n\n    if (!labelCache.containsKey(key)) {\n      const strokeState = strokeKey ? this.strokeStates[strokeKey] || this.textStrokeState_ : null;\n      const fillState = fillKey ? this.fillStates[fillKey] || this.textFillState_ : null;\n      const textState = this.textStates[textKey] || this.textState_;\n      const pixelRatio = this.pixelRatio;\n      const scale = textState.scale * pixelRatio;\n      const align = TEXT_ALIGN[textState.textAlign || defaultTextAlign];\n      const strokeWidth = strokeKey && strokeState.lineWidth ? strokeState.lineWidth : 0;\n\n      const lines = text.split('\\n');\n      const numLines = lines.length;\n      const widths = [];\n      const width = measureTextWidths(textState.font, lines, widths);\n      const lineHeight = measureTextHeight(textState.font);\n      const height = lineHeight * numLines;\n      const renderWidth = (width + strokeWidth);\n      const context = createCanvasContext2D(\n        Math.ceil(renderWidth * scale),\n        Math.ceil((height + strokeWidth) * scale));\n      label = context.canvas;\n      labelCache.set(key, label);\n      if (scale != 1) {\n        context.scale(scale, scale);\n      }\n      context.font = textState.font;\n      if (strokeKey) {\n        context.strokeStyle = strokeState.strokeStyle;\n        context.lineWidth = strokeWidth;\n        context.lineCap = strokeState.lineCap;\n        context.lineJoin = strokeState.lineJoin;\n        context.miterLimit = strokeState.miterLimit;\n        if (CANVAS_LINE_DASH && strokeState.lineDash.length) {\n          context.setLineDash(strokeState.lineDash);\n          context.lineDashOffset = strokeState.lineDashOffset;\n        }\n      }\n      if (fillKey) {\n        context.fillStyle = fillState.fillStyle;\n      }\n      context.textBaseline = 'middle';\n      context.textAlign = 'center';\n      const leftRight = (0.5 - align);\n      const x = align * label.width / scale + leftRight * strokeWidth;\n      let i;\n      if (strokeKey) {\n        for (i = 0; i < numLines; ++i) {\n          context.strokeText(lines[i], x + leftRight * widths[i], 0.5 * (strokeWidth + lineHeight) + i * lineHeight);\n        }\n      }\n      if (fillKey) {\n        for (i = 0; i < numLines; ++i) {\n          context.fillText(lines[i], x + leftRight * widths[i], 0.5 * (strokeWidth + lineHeight) + i * lineHeight);\n        }\n      }\n    }\n    return labelCache.get(key);\n  }\n\n  /**\n   * @private\n   * @param {HTMLCanvasElement} label Label.\n   * @param {number} begin Begin.\n   * @param {number} end End.\n   */\n  drawTextImage_(label, begin, end) {\n    const textState = this.textState_;\n    const strokeState = this.textStrokeState_;\n    const pixelRatio = this.pixelRatio;\n    const align = TEXT_ALIGN[textState.textAlign || defaultTextAlign];\n    const baseline = TEXT_ALIGN[textState.textBaseline];\n    const strokeWidth = strokeState && strokeState.lineWidth ? strokeState.lineWidth : 0;\n\n    const anchorX = align * label.width / pixelRatio + 2 * (0.5 - align) * strokeWidth;\n    const anchorY = baseline * label.height / pixelRatio + 2 * (0.5 - baseline) * strokeWidth;\n    this.instructions.push([CanvasInstruction.DRAW_IMAGE, begin, end,\n      label, (anchorX - this.textOffsetX_) * pixelRatio, (anchorY - this.textOffsetY_) * pixelRatio,\n      this.declutterGroup_, label.height, 1, 0, 0, this.textRotateWithView_, this.textRotation_,\n      1, label.width,\n      textState.padding == defaultPadding ?\n        defaultPadding : textState.padding.map(function(p) {\n          return p * pixelRatio;\n        }),\n      !!textState.backgroundFill, !!textState.backgroundStroke\n    ]);\n    this.hitDetectionInstructions.push([CanvasInstruction.DRAW_IMAGE, begin, end,\n      label, (anchorX - this.textOffsetX_) * pixelRatio, (anchorY - this.textOffsetY_) * pixelRatio,\n      this.declutterGroup_, label.height, 1, 0, 0, this.textRotateWithView_, this.textRotation_,\n      1 / pixelRatio, label.width, textState.padding,\n      !!textState.backgroundFill, !!textState.backgroundStroke\n    ]);\n  }\n\n  /**\n   * @private\n   * @param {number} begin Begin.\n   * @param {number} end End.\n   * @param {module:ol/render/canvas~DeclutterGroup} declutterGroup Declutter group.\n   */\n  drawChars_(begin, end, declutterGroup) {\n    const strokeState = this.textStrokeState_;\n    const textState = this.textState_;\n    const fillState = this.textFillState_;\n\n    const strokeKey = this.strokeKey_;\n    if (strokeState) {\n      if (!(strokeKey in this.strokeStates)) {\n        this.strokeStates[strokeKey] = /** @type {module:ol/render/canvas~StrokeState} */ ({\n          strokeStyle: strokeState.strokeStyle,\n          lineCap: strokeState.lineCap,\n          lineDashOffset: strokeState.lineDashOffset,\n          lineWidth: strokeState.lineWidth,\n          lineJoin: strokeState.lineJoin,\n          miterLimit: strokeState.miterLimit,\n          lineDash: strokeState.lineDash\n        });\n      }\n    }\n    const textKey = this.textKey_;\n    if (!(this.textKey_ in this.textStates)) {\n      this.textStates[this.textKey_] = /** @type {module:ol/render/canvas~TextState} */ ({\n        font: textState.font,\n        textAlign: textState.textAlign || defaultTextAlign,\n        scale: textState.scale\n      });\n    }\n    const fillKey = this.fillKey_;\n    if (fillState) {\n      if (!(fillKey in this.fillStates)) {\n        this.fillStates[fillKey] = /** @type {module:ol/render/canvas~FillState} */ ({\n          fillStyle: fillState.fillStyle\n        });\n      }\n    }\n\n    const pixelRatio = this.pixelRatio;\n    const baseline = TEXT_ALIGN[textState.textBaseline];\n\n    const offsetY = this.textOffsetY_ * pixelRatio;\n    const text = this.text_;\n    const font = textState.font;\n    const textScale = textState.scale;\n    const strokeWidth = strokeState ? strokeState.lineWidth * textScale / 2 : 0;\n    let widths = this.widths_[font];\n    if (!widths) {\n      this.widths_[font] = widths = {};\n    }\n    this.instructions.push([CanvasInstruction.DRAW_CHARS,\n      begin, end, baseline, declutterGroup,\n      textState.overflow, fillKey, textState.maxAngle,\n      function(text) {\n        let width = widths[text];\n        if (!width) {\n          width = widths[text] = measureTextWidth(font, text);\n        }\n        return width * textScale * pixelRatio;\n      },\n      offsetY, strokeKey, strokeWidth * pixelRatio, text, textKey, 1\n    ]);\n    this.hitDetectionInstructions.push([CanvasInstruction.DRAW_CHARS,\n      begin, end, baseline, declutterGroup,\n      textState.overflow, fillKey, textState.maxAngle,\n      function(text) {\n        let width = widths[text];\n        if (!width) {\n          width = widths[text] = measureTextWidth(font, text);\n        }\n        return width * textScale;\n      },\n      offsetY, strokeKey, strokeWidth, text, textKey, 1 / pixelRatio\n    ]);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setTextStyle(textStyle, declutterGroup) {\n    let textState, fillState, strokeState;\n    if (!textStyle) {\n      this.text_ = '';\n    } else {\n      this.declutterGroup_ = /** @type {module:ol/render/canvas~DeclutterGroup} */ (declutterGroup);\n\n      const textFillStyle = textStyle.getFill();\n      if (!textFillStyle) {\n        fillState = this.textFillState_ = null;\n      } else {\n        fillState = this.textFillState_;\n        if (!fillState) {\n          fillState = this.textFillState_ = /** @type {module:ol/render/canvas~FillState} */ ({});\n        }\n        fillState.fillStyle = asColorLike(\n          textFillStyle.getColor() || defaultFillStyle);\n      }\n\n      const textStrokeStyle = textStyle.getStroke();\n      if (!textStrokeStyle) {\n        strokeState = this.textStrokeState_ = null;\n      } else {\n        strokeState = this.textStrokeState_;\n        if (!strokeState) {\n          strokeState = this.textStrokeState_ = /** @type {module:ol/render/canvas~StrokeState} */ ({});\n        }\n        const lineDash = textStrokeStyle.getLineDash();\n        const lineDashOffset = textStrokeStyle.getLineDashOffset();\n        const lineWidth = textStrokeStyle.getWidth();\n        const miterLimit = textStrokeStyle.getMiterLimit();\n        strokeState.lineCap = textStrokeStyle.getLineCap() || defaultLineCap;\n        strokeState.lineDash = lineDash ? lineDash.slice() : defaultLineDash;\n        strokeState.lineDashOffset =\n            lineDashOffset === undefined ? defaultLineDashOffset : lineDashOffset;\n        strokeState.lineJoin = textStrokeStyle.getLineJoin() || defaultLineJoin;\n        strokeState.lineWidth =\n            lineWidth === undefined ? defaultLineWidth : lineWidth;\n        strokeState.miterLimit =\n            miterLimit === undefined ? defaultMiterLimit : miterLimit;\n        strokeState.strokeStyle = asColorLike(\n          textStrokeStyle.getColor() || defaultStrokeStyle);\n      }\n\n      textState = this.textState_;\n      const font = textStyle.getFont() || defaultFont;\n      checkFont(font);\n      const textScale = textStyle.getScale();\n      textState.overflow = textStyle.getOverflow();\n      textState.font = font;\n      textState.maxAngle = textStyle.getMaxAngle();\n      textState.placement = textStyle.getPlacement();\n      textState.textAlign = textStyle.getTextAlign();\n      textState.textBaseline = textStyle.getTextBaseline() || defaultTextBaseline;\n      textState.backgroundFill = textStyle.getBackgroundFill();\n      textState.backgroundStroke = textStyle.getBackgroundStroke();\n      textState.padding = textStyle.getPadding() || defaultPadding;\n      textState.scale = textScale === undefined ? 1 : textScale;\n\n      const textOffsetX = textStyle.getOffsetX();\n      const textOffsetY = textStyle.getOffsetY();\n      const textRotateWithView = textStyle.getRotateWithView();\n      const textRotation = textStyle.getRotation();\n      this.text_ = textStyle.getText() || '';\n      this.textOffsetX_ = textOffsetX === undefined ? 0 : textOffsetX;\n      this.textOffsetY_ = textOffsetY === undefined ? 0 : textOffsetY;\n      this.textRotateWithView_ = textRotateWithView === undefined ? false : textRotateWithView;\n      this.textRotation_ = textRotation === undefined ? 0 : textRotation;\n\n      this.strokeKey_ = strokeState ?\n        (typeof strokeState.strokeStyle == 'string' ? strokeState.strokeStyle : getUid(strokeState.strokeStyle)) +\n        strokeState.lineCap + strokeState.lineDashOffset + '|' + strokeState.lineWidth +\n        strokeState.lineJoin + strokeState.miterLimit + '[' + strokeState.lineDash.join() + ']' :\n        '';\n      this.textKey_ = textState.font + textState.scale + (textState.textAlign || '?');\n      this.fillKey_ = fillState ?\n        (typeof fillState.fillStyle == 'string' ? fillState.fillStyle : ('|' + getUid(fillState.fillStyle))) :\n        '';\n    }\n  }\n}\n\n\n/**\n * @param {string} font Font to use for measuring.\n * @param {Array<string>} lines Lines to measure.\n * @param {Array<number>} widths Array will be populated with the widths of\n * each line.\n * @return {number} Width of the whole text.\n */\nexport function measureTextWidths(font, lines, widths) {\n  const numLines = lines.length;\n  let width = 0;\n  for (let i = 0; i < numLines; ++i) {\n    const currentWidth = measureTextWidth(font, lines[i]);\n    width = Math.max(width, currentWidth);\n    widths.push(currentWidth);\n  }\n  return width;\n}\n\n\nexport default CanvasTextReplay;\n","/**\n * @module ol/render/canvas/ReplayGroup\n */\n\nimport {numberSafeCompareFunction} from '../../array.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {buffer, createEmpty, extendCoordinate} from '../../extent.js';\nimport {transform2D} from '../../geom/flat/transform.js';\nimport {isEmpty} from '../../obj.js';\nimport ReplayGroup from '../ReplayGroup.js';\nimport ReplayType from '../ReplayType.js';\nimport CanvasReplay from '../canvas/Replay.js';\nimport CanvasImageReplay from '../canvas/ImageReplay.js';\nimport CanvasLineStringReplay from '../canvas/LineStringReplay.js';\nimport CanvasPolygonReplay from '../canvas/PolygonReplay.js';\nimport CanvasTextReplay from '../canvas/TextReplay.js';\nimport {ORDER} from '../replay.js';\nimport {create as createTransform, compose as composeTransform} from '../../transform.js';\n\n\n/**\n * @type {Object<module:ol/render/ReplayType,\n *                function(new: module:ol/render/canvas/Replay, number, module:ol/extent~Extent,\n *                number, number, boolean, Array<module:ol/render/canvas~DeclutterGroup>)>}\n */\nconst BATCH_CONSTRUCTORS = {\n  'Circle': CanvasPolygonReplay,\n  'Default': CanvasReplay,\n  'Image': CanvasImageReplay,\n  'LineString': CanvasLineStringReplay,\n  'Polygon': CanvasPolygonReplay,\n  'Text': CanvasTextReplay\n};\n\n\nclass CanvasReplayGroup extends ReplayGroup {\n  /**\n   * @param {number} tolerance Tolerance.\n   * @param {module:ol/extent~Extent} maxExtent Max extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {boolean} overlaps The replay group can have overlapping geometries.\n   * @param {?} declutterTree Declutter tree for declutter processing in postrender.\n   * @param {number=} opt_renderBuffer Optional rendering buffer.\n   */\n  constructor(\n    tolerance,\n    maxExtent,\n    resolution,\n    pixelRatio,\n    overlaps,\n    declutterTree,\n    opt_renderBuffer\n  ) {\n    super();\n\n    /**\n     * Declutter tree.\n     * @private\n     */\n    this.declutterTree_ = declutterTree;\n\n    /**\n     * @type {module:ol/render/canvas~DeclutterGroup}\n     * @private\n     */\n    this.declutterGroup_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.tolerance_ = tolerance;\n\n    /**\n     * @private\n     * @type {module:ol/extent~Extent}\n     */\n    this.maxExtent_ = maxExtent;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.overlaps_ = overlaps;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.pixelRatio_ = pixelRatio;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.resolution_ = resolution;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.renderBuffer_ = opt_renderBuffer;\n\n    /**\n     * @private\n     * @type {!Object<string, !Object<module:ol/render/ReplayType, module:ol/render/canvas/Replay>>}\n     */\n    this.replaysByZIndex_ = {};\n\n    /**\n     * @private\n     * @type {CanvasRenderingContext2D}\n     */\n    this.hitDetectionContext_ = createCanvasContext2D(1, 1);\n\n    /**\n     * @private\n     * @type {module:ol/transform~Transform}\n     */\n    this.hitDetectionTransform_ = createTransform();\n  }\n\n  /**\n   * @param {boolean} group Group with previous replay.\n   * @return {module:ol/render/canvas~DeclutterGroup} Declutter instruction group.\n   */\n  addDeclutter(group) {\n    let declutter = null;\n    if (this.declutterTree_) {\n      if (group) {\n        declutter = this.declutterGroup_;\n        /** @type {number} */ (declutter[4])++;\n      } else {\n        declutter = this.declutterGroup_ = createEmpty();\n        declutter.push(1);\n      }\n    }\n    return declutter;\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {module:ol/transform~Transform} transform Transform.\n   */\n  clip(context, transform) {\n    const flatClipCoords = this.getClipCoords(transform);\n    context.beginPath();\n    context.moveTo(flatClipCoords[0], flatClipCoords[1]);\n    context.lineTo(flatClipCoords[2], flatClipCoords[3]);\n    context.lineTo(flatClipCoords[4], flatClipCoords[5]);\n    context.lineTo(flatClipCoords[6], flatClipCoords[7]);\n    context.clip();\n  }\n\n  /**\n   * @param {Array<module:ol/render/ReplayType>} replays Replays.\n   * @return {boolean} Has replays of the provided types.\n   */\n  hasReplays(replays) {\n    for (const zIndex in this.replaysByZIndex_) {\n      const candidates = this.replaysByZIndex_[zIndex];\n      for (let i = 0, ii = replays.length; i < ii; ++i) {\n        if (replays[i] in candidates) {\n          return true;\n        }\n      }\n    }\n    return false;\n  }\n\n  /**\n   * FIXME empty description for jsdoc\n   */\n  finish() {\n    for (const zKey in this.replaysByZIndex_) {\n      const replays = this.replaysByZIndex_[zKey];\n      for (const replayKey in replays) {\n        replays[replayKey].finish();\n      }\n    }\n  }\n\n  /**\n   * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n   * @param {number} resolution Resolution.\n   * @param {number} rotation Rotation.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @param {Object<string, boolean>} skippedFeaturesHash Ids of features to skip.\n   * @param {function((module:ol/Feature|module:ol/render/Feature)): T} callback Feature callback.\n   * @param {Object<string, module:ol/render/canvas~DeclutterGroup>} declutterReplays Declutter replays.\n   * @return {T|undefined} Callback result.\n   * @template T\n   */\n  forEachFeatureAtCoordinate(\n    coordinate,\n    resolution,\n    rotation,\n    hitTolerance,\n    skippedFeaturesHash,\n    callback,\n    declutterReplays\n  ) {\n\n    hitTolerance = Math.round(hitTolerance);\n    const contextSize = hitTolerance * 2 + 1;\n    const transform = composeTransform(this.hitDetectionTransform_,\n      hitTolerance + 0.5, hitTolerance + 0.5,\n      1 / resolution, -1 / resolution,\n      -rotation,\n      -coordinate[0], -coordinate[1]);\n    const context = this.hitDetectionContext_;\n\n    if (context.canvas.width !== contextSize || context.canvas.height !== contextSize) {\n      context.canvas.width = contextSize;\n      context.canvas.height = contextSize;\n    } else {\n      context.clearRect(0, 0, contextSize, contextSize);\n    }\n\n    /**\n     * @type {module:ol/extent~Extent}\n     */\n    let hitExtent;\n    if (this.renderBuffer_ !== undefined) {\n      hitExtent = createEmpty();\n      extendCoordinate(hitExtent, coordinate);\n      buffer(hitExtent, resolution * (this.renderBuffer_ + hitTolerance), hitExtent);\n    }\n\n    const mask = getCircleArray(hitTolerance);\n    let declutteredFeatures;\n    if (this.declutterTree_) {\n      declutteredFeatures = this.declutterTree_.all().map(function(entry) {\n        return entry.value;\n      });\n    }\n\n    let replayType;\n\n    /**\n     * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n     * @return {?} Callback result.\n     */\n    function featureCallback(feature) {\n      const imageData = context.getImageData(0, 0, contextSize, contextSize).data;\n      for (let i = 0; i < contextSize; i++) {\n        for (let j = 0; j < contextSize; j++) {\n          if (mask[i][j]) {\n            if (imageData[(j * contextSize + i) * 4 + 3] > 0) {\n              let result;\n              if (!(declutteredFeatures && (replayType == ReplayType.IMAGE || replayType == ReplayType.TEXT)) ||\n                  declutteredFeatures.indexOf(feature) !== -1) {\n                result = callback(feature);\n              }\n              if (result) {\n                return result;\n              } else {\n                context.clearRect(0, 0, contextSize, contextSize);\n                return undefined;\n              }\n            }\n          }\n        }\n      }\n    }\n\n    /** @type {Array<number>} */\n    const zs = Object.keys(this.replaysByZIndex_).map(Number);\n    zs.sort(numberSafeCompareFunction);\n\n    let i, j, replays, replay, result;\n    for (i = zs.length - 1; i >= 0; --i) {\n      const zIndexKey = zs[i].toString();\n      replays = this.replaysByZIndex_[zIndexKey];\n      for (j = ORDER.length - 1; j >= 0; --j) {\n        replayType = ORDER[j];\n        replay = replays[replayType];\n        if (replay !== undefined) {\n          if (declutterReplays &&\n              (replayType == ReplayType.IMAGE || replayType == ReplayType.TEXT)) {\n            const declutter = declutterReplays[zIndexKey];\n            if (!declutter) {\n              declutterReplays[zIndexKey] = [replay, transform.slice(0)];\n            } else {\n              declutter.push(replay, transform.slice(0));\n            }\n          } else {\n            result = replay.replayHitDetection(context, transform, rotation,\n              skippedFeaturesHash, featureCallback, hitExtent);\n            if (result) {\n              return result;\n            }\n          }\n        }\n      }\n    }\n    return undefined;\n  }\n\n  /**\n   * @param {module:ol/transform~Transform} transform Transform.\n   * @return {Array<number>} Clip coordinates.\n   */\n  getClipCoords(transform) {\n    const maxExtent = this.maxExtent_;\n    const minX = maxExtent[0];\n    const minY = maxExtent[1];\n    const maxX = maxExtent[2];\n    const maxY = maxExtent[3];\n    const flatClipCoords = [minX, minY, minX, maxY, maxX, maxY, maxX, minY];\n    transform2D(\n      flatClipCoords, 0, 8, 2, transform, flatClipCoords);\n    return flatClipCoords;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getReplay(zIndex, replayType) {\n    const zIndexKey = zIndex !== undefined ? zIndex.toString() : '0';\n    let replays = this.replaysByZIndex_[zIndexKey];\n    if (replays === undefined) {\n      replays = {};\n      this.replaysByZIndex_[zIndexKey] = replays;\n    }\n    let replay = replays[replayType];\n    if (replay === undefined) {\n      const Constructor = BATCH_CONSTRUCTORS[replayType];\n      replay = new Constructor(this.tolerance_, this.maxExtent_,\n        this.resolution_, this.pixelRatio_, this.overlaps_, this.declutterTree_);\n      replays[replayType] = replay;\n    }\n    return replay;\n  }\n\n  /**\n   * @return {Object<string, Object<module:ol/render/ReplayType, module:ol/render/canvas/Replay>>} Replays.\n   */\n  getReplays() {\n    return this.replaysByZIndex_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  isEmpty() {\n    return isEmpty(this.replaysByZIndex_);\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {module:ol/transform~Transform} transform Transform.\n   * @param {number} viewRotation View rotation.\n   * @param {Object<string, boolean>} skippedFeaturesHash Ids of features to skip.\n   * @param {boolean} snapToPixel Snap point symbols and test to integer pixel.\n   * @param {Array<module:ol/render/ReplayType>=} opt_replayTypes Ordered replay types to replay.\n   *     Default is {@link module:ol/render/replay~ORDER}\n   * @param {Object<string, module:ol/render/canvas~DeclutterGroup>=} opt_declutterReplays Declutter replays.\n   */\n  replay(\n    context,\n    transform,\n    viewRotation,\n    skippedFeaturesHash,\n    snapToPixel,\n    opt_replayTypes,\n    opt_declutterReplays\n  ) {\n\n    /** @type {Array<number>} */\n    const zs = Object.keys(this.replaysByZIndex_).map(Number);\n    zs.sort(numberSafeCompareFunction);\n\n    // setup clipping so that the parts of over-simplified geometries are not\n    // visible outside the current extent when panning\n    context.save();\n    this.clip(context, transform);\n\n    const replayTypes = opt_replayTypes ? opt_replayTypes : ORDER;\n    let i, ii, j, jj, replays, replay;\n    for (i = 0, ii = zs.length; i < ii; ++i) {\n      const zIndexKey = zs[i].toString();\n      replays = this.replaysByZIndex_[zIndexKey];\n      for (j = 0, jj = replayTypes.length; j < jj; ++j) {\n        const replayType = replayTypes[j];\n        replay = replays[replayType];\n        if (replay !== undefined) {\n          if (opt_declutterReplays &&\n              (replayType == ReplayType.IMAGE || replayType == ReplayType.TEXT)) {\n            const declutter = opt_declutterReplays[zIndexKey];\n            if (!declutter) {\n              opt_declutterReplays[zIndexKey] = [replay, transform.slice(0)];\n            } else {\n              declutter.push(replay, transform.slice(0));\n            }\n          } else {\n            replay.replay(context, transform, viewRotation, skippedFeaturesHash, snapToPixel);\n          }\n        }\n      }\n    }\n\n    context.restore();\n  }\n}\n\n\n/**\n * This cache is used for storing calculated pixel circles for increasing performance.\n * It is a static property to allow each Replaygroup to access it.\n * @type {Object<number, Array<Array<(boolean|undefined)>>>}\n */\nconst circleArrayCache = {\n  0: [[true]]\n};\n\n\n/**\n * This method fills a row in the array from the given coordinate to the\n * middle with `true`.\n * @param {Array<Array<(boolean|undefined)>>} array The array that will be altered.\n * @param {number} x X coordinate.\n * @param {number} y Y coordinate.\n */\nfunction fillCircleArrayRowToMiddle(array, x, y) {\n  let i;\n  const radius = Math.floor(array.length / 2);\n  if (x >= radius) {\n    for (i = radius; i < x; i++) {\n      array[i][y] = true;\n    }\n  } else if (x < radius) {\n    for (i = x + 1; i < radius; i++) {\n      array[i][y] = true;\n    }\n  }\n}\n\n\n/**\n * This methods creates a circle inside a fitting array. Points inside the\n * circle are marked by true, points on the outside are undefined.\n * It uses the midpoint circle algorithm.\n * A cache is used to increase performance.\n * @param {number} radius Radius.\n * @returns {Array<Array<(boolean|undefined)>>} An array with marked circle points.\n */\nexport function getCircleArray(radius) {\n  if (circleArrayCache[radius] !== undefined) {\n    return circleArrayCache[radius];\n  }\n\n  const arraySize = radius * 2 + 1;\n  const arr = new Array(arraySize);\n  for (let i = 0; i < arraySize; i++) {\n    arr[i] = new Array(arraySize);\n  }\n\n  let x = radius;\n  let y = 0;\n  let error = 0;\n\n  while (x >= y) {\n    fillCircleArrayRowToMiddle(arr, radius + x, radius + y);\n    fillCircleArrayRowToMiddle(arr, radius + y, radius + x);\n    fillCircleArrayRowToMiddle(arr, radius - y, radius + x);\n    fillCircleArrayRowToMiddle(arr, radius - x, radius + y);\n    fillCircleArrayRowToMiddle(arr, radius - x, radius - y);\n    fillCircleArrayRowToMiddle(arr, radius - y, radius - x);\n    fillCircleArrayRowToMiddle(arr, radius + y, radius - x);\n    fillCircleArrayRowToMiddle(arr, radius + x, radius - y);\n\n    y++;\n    error += 1 + 2 * y;\n    if (2 * (error - x) + 1 > 0) {\n      x -= 1;\n      error += 1 - 2 * x;\n    }\n  }\n\n  circleArrayCache[radius] = arr;\n  return arr;\n}\n\n\n/**\n * @param {!Object<string, Array<*>>} declutterReplays Declutter replays.\n * @param {CanvasRenderingContext2D} context Context.\n * @param {number} rotation Rotation.\n * @param {boolean} snapToPixel Snap point symbols and text to integer pixels.\n */\nexport function replayDeclutter(declutterReplays, context, rotation, snapToPixel) {\n  const zs = Object.keys(declutterReplays).map(Number).sort(numberSafeCompareFunction);\n  const skippedFeatureUids = {};\n  for (let z = 0, zz = zs.length; z < zz; ++z) {\n    const replayData = declutterReplays[zs[z].toString()];\n    for (let i = 0, ii = replayData.length; i < ii;) {\n      const replay = replayData[i++];\n      const transform = replayData[i++];\n      replay.replay(context, transform, rotation, skippedFeatureUids, snapToPixel);\n    }\n  }\n}\n\n\nexport default CanvasReplayGroup;\n","/**\n * @module ol/renderer/vector\n */\nimport {getUid} from '../util.js';\nimport ImageState from '../ImageState.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport ReplayType from '../render/ReplayType.js';\n\n\n/**\n * Tolerance for geometry simplification in device pixels.\n * @type {number}\n */\nconst SIMPLIFY_TOLERANCE = 0.5;\n\n\n/**\n * @const\n * @type {Object<module:ol/geom/GeometryType,\n *                function(module:ol/render/ReplayGroup, module:ol/geom/Geometry,\n *                         module:ol/style/Style, Object)>}\n */\nconst GEOMETRY_RENDERERS = {\n  'Point': renderPointGeometry,\n  'LineString': renderLineStringGeometry,\n  'Polygon': renderPolygonGeometry,\n  'MultiPoint': renderMultiPointGeometry,\n  'MultiLineString': renderMultiLineStringGeometry,\n  'MultiPolygon': renderMultiPolygonGeometry,\n  'GeometryCollection': renderGeometryCollectionGeometry,\n  'Circle': renderCircleGeometry\n};\n\n\n/**\n * @param {module:ol/Feature|module:ol/render/Feature} feature1 Feature 1.\n * @param {module:ol/Feature|module:ol/render/Feature} feature2 Feature 2.\n * @return {number} Order.\n */\nexport function defaultOrder(feature1, feature2) {\n  return getUid(feature1) - getUid(feature2);\n}\n\n\n/**\n * @param {number} resolution Resolution.\n * @param {number} pixelRatio Pixel ratio.\n * @return {number} Squared pixel tolerance.\n */\nexport function getSquaredTolerance(resolution, pixelRatio) {\n  const tolerance = getTolerance(resolution, pixelRatio);\n  return tolerance * tolerance;\n}\n\n\n/**\n * @param {number} resolution Resolution.\n * @param {number} pixelRatio Pixel ratio.\n * @return {number} Pixel tolerance.\n */\nexport function getTolerance(resolution, pixelRatio) {\n  return SIMPLIFY_TOLERANCE * resolution / pixelRatio;\n}\n\n\n/**\n * @param {module:ol/render/ReplayGroup} replayGroup Replay group.\n * @param {module:ol/geom/Circle} geometry Geometry.\n * @param {module:ol/style/Style} style Style.\n * @param {module:ol/Feature} feature Feature.\n */\nfunction renderCircleGeometry(replayGroup, geometry, style, feature) {\n  const fillStyle = style.getFill();\n  const strokeStyle = style.getStroke();\n  if (fillStyle || strokeStyle) {\n    const circleReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.CIRCLE);\n    circleReplay.setFillStrokeStyle(fillStyle, strokeStyle);\n    circleReplay.drawCircle(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(false));\n    textReplay.drawText(geometry, feature);\n  }\n}\n\n\n/**\n * @param {module:ol/render/ReplayGroup} replayGroup Replay group.\n * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n * @param {module:ol/style/Style} style Style.\n * @param {number} squaredTolerance Squared tolerance.\n * @param {function(this: T, module:ol/events/Event)} listener Listener function.\n * @param {T} thisArg Value to use as `this` when executing `listener`.\n * @return {boolean} `true` if style is loading.\n * @template T\n */\nexport function renderFeature(replayGroup, feature, style, squaredTolerance, listener, thisArg) {\n  let loading = false;\n  const imageStyle = style.getImage();\n  if (imageStyle) {\n    let imageState = imageStyle.getImageState();\n    if (imageState == ImageState.LOADED || imageState == ImageState.ERROR) {\n      imageStyle.unlistenImageChange(listener, thisArg);\n    } else {\n      if (imageState == ImageState.IDLE) {\n        imageStyle.load();\n      }\n      imageState = imageStyle.getImageState();\n      imageStyle.listenImageChange(listener, thisArg);\n      loading = true;\n    }\n  }\n  renderFeatureInternal(replayGroup, feature, style, squaredTolerance);\n\n  return loading;\n}\n\n\n/**\n * @param {module:ol/render/ReplayGroup} replayGroup Replay group.\n * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n * @param {module:ol/style/Style} style Style.\n * @param {number} squaredTolerance Squared tolerance.\n */\nfunction renderFeatureInternal(replayGroup, feature, style, squaredTolerance) {\n  const geometry = style.getGeometryFunction()(feature);\n  if (!geometry) {\n    return;\n  }\n  const simplifiedGeometry = geometry.getSimplifiedGeometry(squaredTolerance);\n  const renderer = style.getRenderer();\n  if (renderer) {\n    renderGeometry(replayGroup, simplifiedGeometry, style, feature);\n  } else {\n    const geometryRenderer = GEOMETRY_RENDERERS[simplifiedGeometry.getType()];\n    geometryRenderer(replayGroup, simplifiedGeometry, style, feature);\n  }\n}\n\n\n/**\n * @param {module:ol/render/ReplayGroup} replayGroup Replay group.\n * @param {module:ol/geom/Geometry} geometry Geometry.\n * @param {module:ol/style/Style} style Style.\n * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n */\nfunction renderGeometry(replayGroup, geometry, style, feature) {\n  if (geometry.getType() == GeometryType.GEOMETRY_COLLECTION) {\n    const geometries = /** @type {module:ol/geom/GeometryCollection} */ (geometry).getGeometries();\n    for (let i = 0, ii = geometries.length; i < ii; ++i) {\n      renderGeometry(replayGroup, geometries[i], style, feature);\n    }\n    return;\n  }\n  const replay = replayGroup.getReplay(style.getZIndex(), ReplayType.DEFAULT);\n  replay.drawCustom(/** @type {module:ol/geom/SimpleGeometry} */ (geometry), feature, style.getRenderer());\n}\n\n\n/**\n * @param {module:ol/render/ReplayGroup} replayGroup Replay group.\n * @param {module:ol/geom/GeometryCollection} geometry Geometry.\n * @param {module:ol/style/Style} style Style.\n * @param {module:ol/Feature} feature Feature.\n */\nfunction renderGeometryCollectionGeometry(replayGroup, geometry, style, feature) {\n  const geometries = geometry.getGeometriesArray();\n  let i, ii;\n  for (i = 0, ii = geometries.length; i < ii; ++i) {\n    const geometryRenderer =\n        GEOMETRY_RENDERERS[geometries[i].getType()];\n    geometryRenderer(replayGroup, geometries[i], style, feature);\n  }\n}\n\n\n/**\n * @param {module:ol/render/ReplayGroup} replayGroup Replay group.\n * @param {module:ol/geom/LineString|module:ol/render/Feature} geometry Geometry.\n * @param {module:ol/style/Style} style Style.\n * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n */\nfunction renderLineStringGeometry(replayGroup, geometry, style, feature) {\n  const strokeStyle = style.getStroke();\n  if (strokeStyle) {\n    const lineStringReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.LINE_STRING);\n    lineStringReplay.setFillStrokeStyle(null, strokeStyle);\n    lineStringReplay.drawLineString(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(false));\n    textReplay.drawText(geometry, feature);\n  }\n}\n\n\n/**\n * @param {module:ol/render/ReplayGroup} replayGroup Replay group.\n * @param {module:ol/geom/MultiLineString|module:ol/render/Feature} geometry Geometry.\n * @param {module:ol/style/Style} style Style.\n * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n */\nfunction renderMultiLineStringGeometry(replayGroup, geometry, style, feature) {\n  const strokeStyle = style.getStroke();\n  if (strokeStyle) {\n    const lineStringReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.LINE_STRING);\n    lineStringReplay.setFillStrokeStyle(null, strokeStyle);\n    lineStringReplay.drawMultiLineString(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(false));\n    textReplay.drawText(geometry, feature);\n  }\n}\n\n\n/**\n * @param {module:ol/render/ReplayGroup} replayGroup Replay group.\n * @param {module:ol/geom/MultiPolygon} geometry Geometry.\n * @param {module:ol/style/Style} style Style.\n * @param {module:ol/Feature} feature Feature.\n */\nfunction renderMultiPolygonGeometry(replayGroup, geometry, style, feature) {\n  const fillStyle = style.getFill();\n  const strokeStyle = style.getStroke();\n  if (strokeStyle || fillStyle) {\n    const polygonReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.POLYGON);\n    polygonReplay.setFillStrokeStyle(fillStyle, strokeStyle);\n    polygonReplay.drawMultiPolygon(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(false));\n    textReplay.drawText(geometry, feature);\n  }\n}\n\n\n/**\n * @param {module:ol/render/ReplayGroup} replayGroup Replay group.\n * @param {module:ol/geom/Point|module:ol/render/Feature} geometry Geometry.\n * @param {module:ol/style/Style} style Style.\n * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n */\nfunction renderPointGeometry(replayGroup, geometry, style, feature) {\n  const imageStyle = style.getImage();\n  if (imageStyle) {\n    if (imageStyle.getImageState() != ImageState.LOADED) {\n      return;\n    }\n    const imageReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.IMAGE);\n    imageReplay.setImageStyle(imageStyle, replayGroup.addDeclutter(false));\n    imageReplay.drawPoint(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(!!imageStyle));\n    textReplay.drawText(geometry, feature);\n  }\n}\n\n\n/**\n * @param {module:ol/render/ReplayGroup} replayGroup Replay group.\n * @param {module:ol/geom/MultiPoint|module:ol/render/Feature} geometry Geometry.\n * @param {module:ol/style/Style} style Style.\n * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n */\nfunction renderMultiPointGeometry(replayGroup, geometry, style, feature) {\n  const imageStyle = style.getImage();\n  if (imageStyle) {\n    if (imageStyle.getImageState() != ImageState.LOADED) {\n      return;\n    }\n    const imageReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.IMAGE);\n    imageReplay.setImageStyle(imageStyle, replayGroup.addDeclutter(false));\n    imageReplay.drawMultiPoint(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(!!imageStyle));\n    textReplay.drawText(geometry, feature);\n  }\n}\n\n\n/**\n * @param {module:ol/render/ReplayGroup} replayGroup Replay group.\n * @param {module:ol/geom/Polygon|module:ol/render/Feature} geometry Geometry.\n * @param {module:ol/style/Style} style Style.\n * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n */\nfunction renderPolygonGeometry(replayGroup, geometry, style, feature) {\n  const fillStyle = style.getFill();\n  const strokeStyle = style.getStroke();\n  if (fillStyle || strokeStyle) {\n    const polygonReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.POLYGON);\n    polygonReplay.setFillStrokeStyle(fillStyle, strokeStyle);\n    polygonReplay.drawPolygon(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(false));\n    textReplay.drawText(geometry, feature);\n  }\n}\n","/**\n * @module ol/renderer/canvas/VectorLayer\n */\nimport {getUid} from '../../util.js';\nimport LayerType from '../../LayerType.js';\nimport ViewHint from '../../ViewHint.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {listen, unlisten} from '../../events.js';\nimport EventType from '../../events/EventType.js';\nimport rbush from 'rbush';\nimport {buffer, createEmpty, containsExtent, getWidth} from '../../extent.js';\nimport RenderEventType from '../../render/EventType.js';\nimport {labelCache, rotateAtOffset} from '../../render/canvas.js';\nimport CanvasReplayGroup from '../../render/canvas/ReplayGroup.js';\nimport CanvasLayerRenderer from '../canvas/Layer.js';\nimport {defaultOrder as defaultRenderOrder, getTolerance as getRenderTolerance, getSquaredTolerance as getSquaredRenderTolerance, renderFeature} from '../vector.js';\n\n/**\n * @classdesc\n * Canvas renderer for vector layers.\n * @api\n */\nclass CanvasVectorLayerRenderer extends CanvasLayerRenderer {\n\n  /**\n   * @param {module:ol/layer/Vector} vectorLayer Vector layer.\n   */\n  constructor(vectorLayer) {\n\n    super(vectorLayer);\n\n    /**\n     * Declutter tree.\n     * @private\n     */\n    this.declutterTree_ = vectorLayer.getDeclutter() ? rbush(9, undefined) : null;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.dirty_ = false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.renderedRevision_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.renderedResolution_ = NaN;\n\n    /**\n     * @private\n     * @type {module:ol/extent~Extent}\n     */\n    this.renderedExtent_ = createEmpty();\n\n    /**\n     * @private\n     * @type {function(module:ol/Feature, module:ol/Feature): number|null}\n     */\n    this.renderedRenderOrder_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/render/canvas/ReplayGroup}\n     */\n    this.replayGroup_ = null;\n\n    /**\n     * A new replay group had to be created by `prepareFrame()`\n     * @type {boolean}\n     */\n    this.replayGroupChanged = true;\n\n    /**\n     * @type {CanvasRenderingContext2D}\n     */\n    this.context = createCanvasContext2D();\n\n    listen(labelCache, EventType.CLEAR, this.handleFontsChanged_, this);\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    unlisten(labelCache, EventType.CLEAR, this.handleFontsChanged_, this);\n    super.disposeInternal();\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @param {module:ol/layer/Layer~State} layerState Layer state.\n   */\n  compose(context, frameState, layerState) {\n    const extent = frameState.extent;\n    const pixelRatio = frameState.pixelRatio;\n    const skippedFeatureUids = layerState.managed ?\n      frameState.skippedFeatureUids : {};\n    const viewState = frameState.viewState;\n    const projection = viewState.projection;\n    const rotation = viewState.rotation;\n    const projectionExtent = projection.getExtent();\n    const vectorSource = /** @type {module:ol/source/Vector} */ (this.getLayer().getSource());\n\n    let transform = this.getTransform(frameState, 0);\n\n    // clipped rendering if layer extent is set\n    const clipExtent = layerState.extent;\n    const clipped = clipExtent !== undefined;\n    if (clipped) {\n      this.clip(context, frameState, /** @type {module:ol/extent~Extent} */ (clipExtent));\n    }\n    const replayGroup = this.replayGroup_;\n    if (replayGroup && !replayGroup.isEmpty()) {\n      if (this.declutterTree_) {\n        this.declutterTree_.clear();\n      }\n      const layer = /** @type {module:ol/layer/Vector} */ (this.getLayer());\n      let drawOffsetX = 0;\n      let drawOffsetY = 0;\n      let replayContext;\n      const transparentLayer = layerState.opacity !== 1;\n      const hasRenderListeners = layer.hasListener(RenderEventType.RENDER);\n      if (transparentLayer || hasRenderListeners) {\n        let drawWidth = context.canvas.width;\n        let drawHeight = context.canvas.height;\n        if (rotation) {\n          const drawSize = Math.round(Math.sqrt(drawWidth * drawWidth + drawHeight * drawHeight));\n          drawOffsetX = (drawSize - drawWidth) / 2;\n          drawOffsetY = (drawSize - drawHeight) / 2;\n          drawWidth = drawHeight = drawSize;\n        }\n        // resize and clear\n        this.context.canvas.width = drawWidth;\n        this.context.canvas.height = drawHeight;\n        replayContext = this.context;\n      } else {\n        replayContext = context;\n      }\n\n      const alpha = replayContext.globalAlpha;\n      if (!transparentLayer) {\n        // for performance reasons, context.save / context.restore is not used\n        // to save and restore the transformation matrix and the opacity.\n        // see http://jsperf.com/context-save-restore-versus-variable\n        replayContext.globalAlpha = layerState.opacity;\n      }\n\n      if (replayContext != context) {\n        replayContext.translate(drawOffsetX, drawOffsetY);\n      }\n\n      const viewHints = frameState.viewHints;\n      const snapToPixel = !(viewHints[ViewHint.ANIMATING] || viewHints[ViewHint.INTERACTING]);\n      const width = frameState.size[0] * pixelRatio;\n      const height = frameState.size[1] * pixelRatio;\n      rotateAtOffset(replayContext, -rotation,\n        width / 2, height / 2);\n      replayGroup.replay(replayContext, transform, rotation, skippedFeatureUids, snapToPixel);\n      if (vectorSource.getWrapX() && projection.canWrapX() &&\n          !containsExtent(projectionExtent, extent)) {\n        let startX = extent[0];\n        const worldWidth = getWidth(projectionExtent);\n        let world = 0;\n        let offsetX;\n        while (startX < projectionExtent[0]) {\n          --world;\n          offsetX = worldWidth * world;\n          transform = this.getTransform(frameState, offsetX);\n          replayGroup.replay(replayContext, transform, rotation, skippedFeatureUids, snapToPixel);\n          startX += worldWidth;\n        }\n        world = 0;\n        startX = extent[2];\n        while (startX > projectionExtent[2]) {\n          ++world;\n          offsetX = worldWidth * world;\n          transform = this.getTransform(frameState, offsetX);\n          replayGroup.replay(replayContext, transform, rotation, skippedFeatureUids, snapToPixel);\n          startX -= worldWidth;\n        }\n      }\n      rotateAtOffset(replayContext, rotation,\n        width / 2, height / 2);\n\n      if (hasRenderListeners) {\n        this.dispatchRenderEvent(replayContext, frameState, transform);\n      }\n      if (replayContext != context) {\n        if (transparentLayer) {\n          const mainContextAlpha = context.globalAlpha;\n          context.globalAlpha = layerState.opacity;\n          context.drawImage(replayContext.canvas, -drawOffsetX, -drawOffsetY);\n          context.globalAlpha = mainContextAlpha;\n        } else {\n          context.drawImage(replayContext.canvas, -drawOffsetX, -drawOffsetY);\n        }\n        replayContext.translate(-drawOffsetX, -drawOffsetY);\n      }\n\n      if (!transparentLayer) {\n        replayContext.globalAlpha = alpha;\n      }\n    }\n\n    if (clipped) {\n      context.restore();\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  composeFrame(frameState, layerState, context) {\n    const transform = this.getTransform(frameState, 0);\n    this.preCompose(context, frameState, transform);\n    this.compose(context, frameState, layerState);\n    this.postCompose(context, frameState, layerState, transform);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg) {\n    if (!this.replayGroup_) {\n      return undefined;\n    } else {\n      const resolution = frameState.viewState.resolution;\n      const rotation = frameState.viewState.rotation;\n      const layer = /** @type {module:ol/layer/Vector} */ (this.getLayer());\n      /** @type {!Object<string, boolean>} */\n      const features = {};\n      const result = this.replayGroup_.forEachFeatureAtCoordinate(coordinate, resolution, rotation, hitTolerance, {},\n        /**\n         * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n         * @return {?} Callback result.\n         */\n        function(feature) {\n          const key = getUid(feature).toString();\n          if (!(key in features)) {\n            features[key] = true;\n            return callback.call(thisArg, feature, layer);\n          }\n        }, null);\n      return result;\n    }\n  }\n\n  /**\n   * @param {module:ol/events/Event} event Event.\n   */\n  handleFontsChanged_(event) {\n    const layer = this.getLayer();\n    if (layer.getVisible() && this.replayGroup_) {\n      layer.changed();\n    }\n  }\n\n  /**\n   * Handle changes in image style state.\n   * @param {module:ol/events/Event} event Image style change event.\n   * @private\n   */\n  handleStyleImageChange_(event) {\n    this.renderIfReadyAndVisible();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  prepareFrame(frameState, layerState) {\n    const vectorLayer = /** @type {module:ol/layer/Vector} */ (this.getLayer());\n    const vectorSource = vectorLayer.getSource();\n\n    const animating = frameState.viewHints[ViewHint.ANIMATING];\n    const interacting = frameState.viewHints[ViewHint.INTERACTING];\n    const updateWhileAnimating = vectorLayer.getUpdateWhileAnimating();\n    const updateWhileInteracting = vectorLayer.getUpdateWhileInteracting();\n\n    if (!this.dirty_ && (!updateWhileAnimating && animating) ||\n        (!updateWhileInteracting && interacting)) {\n      return true;\n    }\n\n    const frameStateExtent = frameState.extent;\n    const viewState = frameState.viewState;\n    const projection = viewState.projection;\n    const resolution = viewState.resolution;\n    const pixelRatio = frameState.pixelRatio;\n    const vectorLayerRevision = vectorLayer.getRevision();\n    const vectorLayerRenderBuffer = vectorLayer.getRenderBuffer();\n    let vectorLayerRenderOrder = vectorLayer.getRenderOrder();\n\n    if (vectorLayerRenderOrder === undefined) {\n      vectorLayerRenderOrder = defaultRenderOrder;\n    }\n\n    const extent = buffer(frameStateExtent,\n      vectorLayerRenderBuffer * resolution);\n    const projectionExtent = viewState.projection.getExtent();\n\n    if (vectorSource.getWrapX() && viewState.projection.canWrapX() &&\n        !containsExtent(projectionExtent, frameState.extent)) {\n      // For the replay group, we need an extent that intersects the real world\n      // (-180° to +180°). To support geometries in a coordinate range from -540°\n      // to +540°, we add at least 1 world width on each side of the projection\n      // extent. If the viewport is wider than the world, we need to add half of\n      // the viewport width to make sure we cover the whole viewport.\n      const worldWidth = getWidth(projectionExtent);\n      const gutter = Math.max(getWidth(extent) / 2, worldWidth);\n      extent[0] = projectionExtent[0] - gutter;\n      extent[2] = projectionExtent[2] + gutter;\n    }\n\n    if (!this.dirty_ &&\n        this.renderedResolution_ == resolution &&\n        this.renderedRevision_ == vectorLayerRevision &&\n        this.renderedRenderOrder_ == vectorLayerRenderOrder &&\n        containsExtent(this.renderedExtent_, extent)) {\n      this.replayGroupChanged = false;\n      return true;\n    }\n\n    this.replayGroup_ = null;\n\n    this.dirty_ = false;\n\n    const replayGroup = new CanvasReplayGroup(\n      getRenderTolerance(resolution, pixelRatio), extent, resolution,\n      pixelRatio, vectorSource.getOverlaps(), this.declutterTree_, vectorLayer.getRenderBuffer());\n    vectorSource.loadFeatures(extent, resolution, projection);\n    /**\n     * @param {module:ol/Feature} feature Feature.\n     * @this {module:ol/renderer/canvas/VectorLayer}\n     */\n    const render = function(feature) {\n      let styles;\n      const styleFunction = feature.getStyleFunction() || vectorLayer.getStyleFunction();\n      if (styleFunction) {\n        styles = styleFunction(feature, resolution);\n      }\n      if (styles) {\n        const dirty = this.renderFeature(\n          feature, resolution, pixelRatio, styles, replayGroup);\n        this.dirty_ = this.dirty_ || dirty;\n      }\n    }.bind(this);\n    if (vectorLayerRenderOrder) {\n      /** @type {Array<module:ol/Feature>} */\n      const features = [];\n      vectorSource.forEachFeatureInExtent(extent,\n        /**\n         * @param {module:ol/Feature} feature Feature.\n         */\n        function(feature) {\n          features.push(feature);\n        }, this);\n      features.sort(vectorLayerRenderOrder);\n      for (let i = 0, ii = features.length; i < ii; ++i) {\n        render(features[i]);\n      }\n    } else {\n      vectorSource.forEachFeatureInExtent(extent, render, this);\n    }\n    replayGroup.finish();\n\n    this.renderedResolution_ = resolution;\n    this.renderedRevision_ = vectorLayerRevision;\n    this.renderedRenderOrder_ = vectorLayerRenderOrder;\n    this.renderedExtent_ = extent;\n    this.replayGroup_ = replayGroup;\n\n    this.replayGroupChanged = true;\n    return true;\n  }\n\n  /**\n   * @param {module:ol/Feature} feature Feature.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {module:ol/style/Style|Array<module:ol/style/Style>} styles The style or array of styles.\n   * @param {module:ol/render/canvas/ReplayGroup} replayGroup Replay group.\n   * @return {boolean} `true` if an image is loading.\n   */\n  renderFeature(feature, resolution, pixelRatio, styles, replayGroup) {\n    if (!styles) {\n      return false;\n    }\n    let loading = false;\n    if (Array.isArray(styles)) {\n      for (let i = 0, ii = styles.length; i < ii; ++i) {\n        loading = renderFeature(\n          replayGroup, feature, styles[i],\n          getSquaredRenderTolerance(resolution, pixelRatio),\n          this.handleStyleImageChange_, this) || loading;\n      }\n    } else {\n      loading = renderFeature(\n        replayGroup, feature, styles,\n        getSquaredRenderTolerance(resolution, pixelRatio),\n        this.handleStyleImageChange_, this);\n    }\n    return loading;\n  }\n}\n\n\n/**\n * Determine if this renderer handles the provided layer.\n * @param {module:ol/layer/Layer} layer The candidate layer.\n * @return {boolean} The renderer can render the layer.\n */\nCanvasVectorLayerRenderer['handles'] = function(layer) {\n  return layer.getType() === LayerType.VECTOR;\n};\n\n\n/**\n * Create a layer renderer.\n * @param {module:ol/renderer/Map} mapRenderer The map renderer.\n * @param {module:ol/layer/Layer} layer The layer to be rendererd.\n * @return {module:ol/renderer/canvas/VectorLayer} The layer renderer.\n */\nCanvasVectorLayerRenderer['create'] = function(mapRenderer, layer) {\n  return new CanvasVectorLayerRenderer(/** @type {module:ol/layer/Vector} */ (layer));\n};\n\n\nexport default CanvasVectorLayerRenderer;\n","/**\n * @module ol/renderer/canvas/VectorTileLayer\n */\nimport {getUid} from '../../util.js';\nimport LayerType from '../../LayerType.js';\nimport TileState from '../../TileState.js';\nimport ViewHint from '../../ViewHint.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {listen, unlisten} from '../../events.js';\nimport EventType from '../../events/EventType.js';\nimport rbush from 'rbush';\nimport {buffer, containsCoordinate, equals, getIntersection, getTopLeft, intersects} from '../../extent.js';\nimport VectorTileRenderType from '../../layer/VectorTileRenderType.js';\nimport {equivalent as equivalentProjection} from '../../proj.js';\nimport Units from '../../proj/Units.js';\nimport ReplayType from '../../render/ReplayType.js';\nimport {labelCache, rotateAtOffset} from '../../render/canvas.js';\nimport CanvasReplayGroup, {replayDeclutter} from '../../render/canvas/ReplayGroup.js';\nimport {ORDER} from '../../render/replay.js';\nimport CanvasTileLayerRenderer from '../canvas/TileLayer.js';\nimport {getSquaredTolerance as getSquaredRenderTolerance, renderFeature} from '../vector.js';\nimport {\n  create as createTransform,\n  compose as composeTransform,\n  reset as resetTransform,\n  scale as scaleTransform,\n  translate as translateTransform\n} from '../../transform.js';\n\n\n/**\n * @type {!Object<string, Array<module:ol/render/ReplayType>>}\n */\nconst IMAGE_REPLAYS = {\n  'image': [ReplayType.POLYGON, ReplayType.CIRCLE,\n    ReplayType.LINE_STRING, ReplayType.IMAGE, ReplayType.TEXT],\n  'hybrid': [ReplayType.POLYGON, ReplayType.LINE_STRING]\n};\n\n\n/**\n * @type {!Object<string, Array<module:ol/render/ReplayType>>}\n */\nconst VECTOR_REPLAYS = {\n  'image': [ReplayType.DEFAULT],\n  'hybrid': [ReplayType.IMAGE, ReplayType.TEXT, ReplayType.DEFAULT],\n  'vector': ORDER\n};\n\n\n/**\n * @classdesc\n * Canvas renderer for vector tile layers.\n * @api\n */\nclass CanvasVectorTileLayerRenderer extends CanvasTileLayerRenderer {\n\n  /**\n   * @param {module:ol/layer/VectorTile} layer VectorTile layer.\n   */\n  constructor(layer) {\n\n    super(layer, true);\n\n    /**\n     * Declutter tree.\n     * @private\n     */\n    this.declutterTree_ = layer.getDeclutter() ? rbush(9, undefined) : null;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.dirty_ = false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.renderedLayerRevision_;\n\n    /**\n     * @private\n     * @type {module:ol/transform~Transform}\n     */\n    this.tmpTransform_ = createTransform();\n\n    // Use lower resolution for pure vector rendering. Closest resolution otherwise.\n    this.zDirection = layer.getRenderMode() == VectorTileRenderType.VECTOR ? 1 : 0;\n\n    listen(labelCache, EventType.CLEAR, this.handleFontsChanged_, this);\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    unlisten(labelCache, EventType.CLEAR, this.handleFontsChanged_, this);\n    super.disposeInternal();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getTile(z, x, y, pixelRatio, projection) {\n    const tile = super.getTile(z, x, y, pixelRatio, projection);\n    if (tile.getState() === TileState.LOADED) {\n      this.createReplayGroup_(tile, pixelRatio, projection);\n      if (this.context) {\n        this.renderTileImage_(tile, pixelRatio, projection);\n      }\n    }\n    return tile;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  prepareFrame(frameState, layerState) {\n    const layer = this.getLayer();\n    const layerRevision = layer.getRevision();\n    if (this.renderedLayerRevision_ != layerRevision) {\n      this.renderedTiles.length = 0;\n      const renderMode = layer.getRenderMode();\n      if (!this.context && renderMode != VectorTileRenderType.VECTOR) {\n        this.context = createCanvasContext2D();\n      }\n      if (this.context && renderMode == VectorTileRenderType.VECTOR) {\n        this.context = null;\n      }\n    }\n    this.renderedLayerRevision_ = layerRevision;\n    return super.prepareFrame(frameState, layerState);\n  }\n\n  /**\n   * @param {module:ol/VectorImageTile} tile Tile.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @private\n   */\n  createReplayGroup_(tile, pixelRatio, projection) {\n    const layer = this.getLayer();\n    const revision = layer.getRevision();\n    const renderOrder = /** @type {module:ol/render~OrderFunction} */ (layer.getRenderOrder()) || null;\n\n    const replayState = tile.getReplayState(layer);\n    if (!replayState.dirty && replayState.renderedRevision == revision &&\n        replayState.renderedRenderOrder == renderOrder) {\n      return;\n    }\n\n    const source = /** @type {module:ol/source/VectorTile} */ (layer.getSource());\n    const sourceTileGrid = source.getTileGrid();\n    const tileGrid = source.getTileGridForProjection(projection);\n    const resolution = tileGrid.getResolution(tile.tileCoord[0]);\n    const tileExtent = tile.extent;\n\n    const zIndexKeys = {};\n    for (let t = 0, tt = tile.tileKeys.length; t < tt; ++t) {\n      const sourceTile = tile.getTile(tile.tileKeys[t]);\n      if (sourceTile.getState() != TileState.LOADED) {\n        continue;\n      }\n\n      const sourceTileCoord = sourceTile.tileCoord;\n      const sourceTileExtent = sourceTileGrid.getTileCoordExtent(sourceTileCoord);\n      const sharedExtent = getIntersection(tileExtent, sourceTileExtent);\n      const bufferedExtent = equals(sourceTileExtent, sharedExtent) ? null :\n        buffer(sharedExtent, layer.getRenderBuffer() * resolution, this.tmpExtent);\n      const tileProjection = sourceTile.getProjection();\n      let reproject = false;\n      if (!equivalentProjection(projection, tileProjection)) {\n        reproject = true;\n        sourceTile.setProjection(projection);\n      }\n      replayState.dirty = false;\n      const replayGroup = new CanvasReplayGroup(0, sharedExtent, resolution,\n        pixelRatio, source.getOverlaps(), this.declutterTree_, layer.getRenderBuffer());\n      const squaredTolerance = getSquaredRenderTolerance(resolution, pixelRatio);\n\n      /**\n       * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n       * @this {module:ol/renderer/canvas/VectorTileLayer}\n       */\n      const render = function(feature) {\n        let styles;\n        const styleFunction = feature.getStyleFunction() || layer.getStyleFunction();\n        if (styleFunction) {\n          styles = styleFunction(feature, resolution);\n        }\n        if (styles) {\n          const dirty = this.renderFeature(feature, squaredTolerance, styles, replayGroup);\n          this.dirty_ = this.dirty_ || dirty;\n          replayState.dirty = replayState.dirty || dirty;\n        }\n      };\n\n      const features = sourceTile.getFeatures();\n      if (renderOrder && renderOrder !== replayState.renderedRenderOrder) {\n        features.sort(renderOrder);\n      }\n      for (let i = 0, ii = features.length; i < ii; ++i) {\n        const feature = features[i];\n        if (reproject) {\n          if (tileProjection.getUnits() == Units.TILE_PIXELS) {\n            // projected tile extent\n            tileProjection.setWorldExtent(sourceTileExtent);\n            // tile extent in tile pixel space\n            tileProjection.setExtent(sourceTile.getExtent());\n          }\n          feature.getGeometry().transform(tileProjection, projection);\n        }\n        if (!bufferedExtent || intersects(bufferedExtent, feature.getGeometry().getExtent())) {\n          render.call(this, feature);\n        }\n      }\n      replayGroup.finish();\n      for (const r in replayGroup.getReplays()) {\n        zIndexKeys[r] = true;\n      }\n      sourceTile.setReplayGroup(layer, tile.tileCoord.toString(), replayGroup);\n    }\n    replayState.renderedRevision = revision;\n    replayState.renderedRenderOrder = renderOrder;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg) {\n    const resolution = frameState.viewState.resolution;\n    const rotation = frameState.viewState.rotation;\n    hitTolerance = hitTolerance == undefined ? 0 : hitTolerance;\n    const layer = this.getLayer();\n    /** @type {!Object<string, boolean>} */\n    const features = {};\n\n    /** @type {Array<module:ol/VectorImageTile>} */\n    const renderedTiles = this.renderedTiles;\n\n    let bufferedExtent, found;\n    let i, ii, replayGroup;\n    for (i = 0, ii = renderedTiles.length; i < ii; ++i) {\n      const tile = renderedTiles[i];\n      bufferedExtent = buffer(tile.extent, hitTolerance * resolution, bufferedExtent);\n      if (!containsCoordinate(bufferedExtent, coordinate)) {\n        continue;\n      }\n      for (let t = 0, tt = tile.tileKeys.length; t < tt; ++t) {\n        const sourceTile = tile.getTile(tile.tileKeys[t]);\n        if (sourceTile.getState() != TileState.LOADED) {\n          continue;\n        }\n        replayGroup = sourceTile.getReplayGroup(layer, tile.tileCoord.toString());\n        found = found || replayGroup.forEachFeatureAtCoordinate(coordinate, resolution, rotation, hitTolerance, {},\n          /**\n           * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n           * @return {?} Callback result.\n           */\n          function(feature) {\n            const key = getUid(feature).toString();\n            if (!(key in features)) {\n              features[key] = true;\n              return callback.call(thisArg, feature, layer);\n            }\n          }, null);\n      }\n    }\n    return found;\n  }\n\n  /**\n   * @param {module:ol/VectorTile} tile Tile.\n   * @param {module:ol/PluggableMap~FrameState} frameState Frame state.\n   * @return {module:ol/transform~Transform} transform Transform.\n   * @private\n   */\n  getReplayTransform_(tile, frameState) {\n    const layer = this.getLayer();\n    const source = /** @type {module:ol/source/VectorTile} */ (layer.getSource());\n    const tileGrid = source.getTileGrid();\n    const tileCoord = tile.tileCoord;\n    const tileResolution = tileGrid.getResolution(tileCoord[0]);\n    const viewState = frameState.viewState;\n    const pixelRatio = frameState.pixelRatio;\n    const renderResolution = viewState.resolution / pixelRatio;\n    const tileExtent = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent);\n    const center = viewState.center;\n    const origin = getTopLeft(tileExtent);\n    const size = frameState.size;\n    const offsetX = Math.round(pixelRatio * size[0] / 2);\n    const offsetY = Math.round(pixelRatio * size[1] / 2);\n    return composeTransform(this.tmpTransform_,\n      offsetX, offsetY,\n      tileResolution / renderResolution, tileResolution / renderResolution,\n      viewState.rotation,\n      (origin[0] - center[0]) / tileResolution,\n      (center[1] - origin[1]) / tileResolution);\n  }\n\n  /**\n   * @param {module:ol/events/Event} event Event.\n   */\n  handleFontsChanged_(event) {\n    const layer = this.getLayer();\n    if (layer.getVisible() && this.renderedLayerRevision_ !== undefined) {\n      layer.changed();\n    }\n  }\n\n  /**\n   * Handle changes in image style state.\n   * @param {module:ol/events/Event} event Image style change event.\n   * @private\n   */\n  handleStyleImageChange_(event) {\n    this.renderIfReadyAndVisible();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  postCompose(context, frameState, layerState) {\n    const layer = this.getLayer();\n    const renderMode = layer.getRenderMode();\n    if (renderMode != VectorTileRenderType.IMAGE) {\n      const declutterReplays = layer.getDeclutter() ? {} : null;\n      const source = /** @type {module:ol/source/VectorTile} */ (layer.getSource());\n      const replayTypes = VECTOR_REPLAYS[renderMode];\n      const pixelRatio = frameState.pixelRatio;\n      const rotation = frameState.viewState.rotation;\n      const size = frameState.size;\n      let offsetX, offsetY;\n      if (rotation) {\n        offsetX = Math.round(pixelRatio * size[0] / 2);\n        offsetY = Math.round(pixelRatio * size[1] / 2);\n        rotateAtOffset(context, -rotation, offsetX, offsetY);\n      }\n      if (declutterReplays) {\n        this.declutterTree_.clear();\n      }\n      const viewHints = frameState.viewHints;\n      const snapToPixel = !(viewHints[ViewHint.ANIMATING] || viewHints[ViewHint.INTERACTING]);\n      const tiles = this.renderedTiles;\n      const tileGrid = source.getTileGridForProjection(frameState.viewState.projection);\n      const clips = [];\n      const zs = [];\n      for (let i = tiles.length - 1; i >= 0; --i) {\n        const tile = /** @type {module:ol/VectorImageTile} */ (tiles[i]);\n        if (tile.getState() == TileState.ABORT) {\n          continue;\n        }\n        const tileCoord = tile.tileCoord;\n        const worldOffset = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent)[0] - tile.extent[0];\n        let transform = undefined;\n        for (let t = 0, tt = tile.tileKeys.length; t < tt; ++t) {\n          const sourceTile = tile.getTile(tile.tileKeys[t]);\n          if (sourceTile.getState() != TileState.LOADED) {\n            continue;\n          }\n          const replayGroup = sourceTile.getReplayGroup(layer, tileCoord.toString());\n          if (!replayGroup || !replayGroup.hasReplays(replayTypes)) {\n            // sourceTile was not yet loaded when this.createReplayGroup_() was\n            // called, or it has no replays of the types we want to render\n            continue;\n          }\n          if (!transform) {\n            transform = this.getTransform(frameState, worldOffset);\n          }\n          const currentZ = sourceTile.tileCoord[0];\n          const currentClip = replayGroup.getClipCoords(transform);\n          context.save();\n          context.globalAlpha = layerState.opacity;\n          // Create a clip mask for regions in this low resolution tile that are\n          // already filled by a higher resolution tile\n          for (let j = 0, jj = clips.length; j < jj; ++j) {\n            const clip = clips[j];\n            if (currentZ < zs[j]) {\n              context.beginPath();\n              // counter-clockwise (outer ring) for current tile\n              context.moveTo(currentClip[0], currentClip[1]);\n              context.lineTo(currentClip[2], currentClip[3]);\n              context.lineTo(currentClip[4], currentClip[5]);\n              context.lineTo(currentClip[6], currentClip[7]);\n              // clockwise (inner ring) for higher resolution tile\n              context.moveTo(clip[6], clip[7]);\n              context.lineTo(clip[4], clip[5]);\n              context.lineTo(clip[2], clip[3]);\n              context.lineTo(clip[0], clip[1]);\n              context.clip();\n            }\n          }\n          replayGroup.replay(context, transform, rotation, {}, snapToPixel, replayTypes, declutterReplays);\n          context.restore();\n          clips.push(currentClip);\n          zs.push(currentZ);\n        }\n      }\n      if (declutterReplays) {\n        replayDeclutter(declutterReplays, context, rotation, snapToPixel);\n      }\n      if (rotation) {\n        rotateAtOffset(context, rotation,\n          /** @type {number} */ (offsetX), /** @type {number} */ (offsetY));\n      }\n    }\n    super.postCompose(context, frameState, layerState);\n  }\n\n  /**\n   * @param {module:ol/Feature|module:ol/render/Feature} feature Feature.\n   * @param {number} squaredTolerance Squared tolerance.\n   * @param {module:ol/style/Style|Array<module:ol/style/Style>} styles The style or array of styles.\n   * @param {module:ol/render/canvas/ReplayGroup} replayGroup Replay group.\n   * @return {boolean} `true` if an image is loading.\n   */\n  renderFeature(feature, squaredTolerance, styles, replayGroup) {\n    if (!styles) {\n      return false;\n    }\n    let loading = false;\n    if (Array.isArray(styles)) {\n      for (let i = 0, ii = styles.length; i < ii; ++i) {\n        loading = renderFeature(\n          replayGroup, feature, styles[i], squaredTolerance,\n          this.handleStyleImageChange_, this) || loading;\n      }\n    } else {\n      loading = renderFeature(\n        replayGroup, feature, styles, squaredTolerance,\n        this.handleStyleImageChange_, this);\n    }\n    return loading;\n  }\n\n  /**\n   * @param {module:ol/VectorImageTile} tile Tile.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {module:ol/proj/Projection} projection Projection.\n   * @private\n   */\n  renderTileImage_(tile, pixelRatio, projection) {\n    const layer = this.getLayer();\n    const replayState = tile.getReplayState(layer);\n    const revision = layer.getRevision();\n    const replays = IMAGE_REPLAYS[layer.getRenderMode()];\n    if (replays && replayState.renderedTileRevision !== revision) {\n      replayState.renderedTileRevision = revision;\n      const tileCoord = tile.wrappedTileCoord;\n      const z = tileCoord[0];\n      const source = /** @type {module:ol/source/VectorTile} */ (layer.getSource());\n      const tileGrid = source.getTileGridForProjection(projection);\n      const resolution = tileGrid.getResolution(z);\n      const context = tile.getContext(layer);\n      const size = source.getTilePixelSize(z, pixelRatio, projection);\n      context.canvas.width = size[0];\n      context.canvas.height = size[1];\n      const tileExtent = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent);\n      for (let i = 0, ii = tile.tileKeys.length; i < ii; ++i) {\n        const sourceTile = tile.getTile(tile.tileKeys[i]);\n        if (sourceTile.getState() != TileState.LOADED) {\n          continue;\n        }\n        const pixelScale = pixelRatio / resolution;\n        const transform = resetTransform(this.tmpTransform_);\n        scaleTransform(transform, pixelScale, -pixelScale);\n        translateTransform(transform, -tileExtent[0], -tileExtent[3]);\n        const replayGroup = sourceTile.getReplayGroup(layer, tile.tileCoord.toString());\n        replayGroup.replay(context, transform, 0, {}, true, replays);\n      }\n    }\n  }\n}\n\n\n/**\n * Determine if this renderer handles the provided layer.\n * @param {module:ol/layer/Layer} layer The candidate layer.\n * @return {boolean} The renderer can render the layer.\n */\nCanvasVectorTileLayerRenderer['handles'] = function(layer) {\n  return layer.getType() === LayerType.VECTOR_TILE;\n};\n\n\n/**\n * Create a layer renderer.\n * @param {module:ol/renderer/Map} mapRenderer The map renderer.\n * @param {module:ol/layer/Layer} layer The layer to be rendererd.\n * @return {module:ol/renderer/canvas/VectorTileLayer} The layer renderer.\n */\nCanvasVectorTileLayerRenderer['create'] = function(mapRenderer, layer) {\n  return new CanvasVectorTileLayerRenderer(/** @type {module:ol/layer/VectorTile} */ (layer));\n};\n\n\nexport default CanvasVectorTileLayerRenderer;\n","/**\n * @module ol/Map\n */\nimport PluggableMap from './PluggableMap.js';\nimport {defaults as defaultControls} from './control/util.js';\nimport {defaults as defaultInteractions} from './interaction.js';\nimport {assign} from './obj.js';\nimport CanvasImageLayerRenderer from './renderer/canvas/ImageLayer.js';\nimport CanvasMapRenderer from './renderer/canvas/Map.js';\nimport CanvasTileLayerRenderer from './renderer/canvas/TileLayer.js';\nimport CanvasVectorLayerRenderer from './renderer/canvas/VectorLayer.js';\nimport CanvasVectorTileLayerRenderer from './renderer/canvas/VectorTileLayer.js';\n\n/**\n * @classdesc\n * The map is the core component of OpenLayers. For a map to render, a view,\n * one or more layers, and a target container are needed:\n *\n *     import Map from 'ol/Map';\n *     import View from 'ol/View';\n *     import TileLayer from 'ol/layer/Tile';\n *     import OSM from 'ol/source/OSM';\n *\n *     var map = new Map({\n *       view: new View({\n *         center: [0, 0],\n *         zoom: 1\n *       }),\n *       layers: [\n *         new TileLayer({\n *           source: new OSM()\n *         })\n *       ],\n *       target: 'map'\n *     });\n *\n * The above snippet creates a map using a {@link module:ol/layer/Tile} to\n * display {@link module:ol/source/OSM~OSM} OSM data and render it to a DOM\n * element with the id `map`.\n *\n * The constructor places a viewport container (with CSS class name\n * `ol-viewport`) in the target element (see `getViewport()`), and then two\n * further elements within the viewport: one with CSS class name\n * `ol-overlaycontainer-stopevent` for controls and some overlays, and one with\n * CSS class name `ol-overlaycontainer` for other overlays (see the `stopEvent`\n * option of {@link module:ol/Overlay~Overlay} for the difference). The map\n * itself is placed in a further element within the viewport.\n *\n * Layers are stored as a {@link module:ol/Collection~Collection} in\n * layerGroups. A top-level group is provided by the library. This is what is\n * accessed by `getLayerGroup` and `setLayerGroup`. Layers entered in the\n * options are added to this group, and `addLayer` and `removeLayer` change the\n * layer collection in the group. `getLayers` is a convenience function for\n * `getLayerGroup().getLayers()`. Note that {@link module:ol/layer/Group~Group}\n * is a subclass of {@link module:ol/layer/Base}, so layers entered in the\n * options or added with `addLayer` can be groups, which can contain further\n * groups, and so on.\n *\n * @fires module:ol/MapBrowserEvent~MapBrowserEvent\n * @fires module:ol/MapEvent~MapEvent\n * @fires module:ol/render/Event~RenderEvent#postcompose\n * @fires module:ol/render/Event~RenderEvent#precompose\n * @api\n */\nclass Map extends PluggableMap {\n\n  /**\n   * @param {module:ol/PluggableMap~MapOptions} options Map options.\n   */\n  constructor(options) {\n    options = assign({}, options);\n    if (!options.controls) {\n      options.controls = defaultControls();\n    }\n    if (!options.interactions) {\n      options.interactions = defaultInteractions();\n    }\n\n    super(options);\n  }\n\n  createRenderer() {\n    const renderer = new CanvasMapRenderer(this);\n    renderer.registerLayerRenderers([\n      CanvasImageLayerRenderer,\n      CanvasTileLayerRenderer,\n      CanvasVectorLayerRenderer,\n      CanvasVectorTileLayerRenderer\n    ]);\n    return renderer;\n  }\n}\n\n\nexport default Map;\n","/**\n * @module ol/control/util\n */\nimport Collection from '../Collection.js';\nimport Attribution from './Attribution.js';\nimport Rotate from './Rotate.js';\nimport Zoom from './Zoom.js';\n\n\n/**\n * @typedef {Object} DefaultsOptions\n * @property {boolean} [attribution=true] Include\n * {@link module:ol/control/Attribution~Attribution}.\n * @property {module:ol/control/Attribution~Options} [attributionOptions]\n * Options for {@link module:ol/control/Attribution~Attribution}.\n * @property {boolean} [rotate=true] Include\n * {@link module:ol/control/Rotate~Rotate}.\n * @property {module:ol/control/Rotate~Options} [rotateOptions] Options\n * for {@link module:ol/control/Rotate~Rotate}.\n * @property {boolean} [zoom] Include {@link module:ol/control/Zoom~Zoom}.\n * @property {module:ol/control/Zoom~Options} [zoomOptions] Options for\n * {@link module:ol/control/Zoom~Zoom}.\n * @api\n */\n\n\n/**\n * Set of controls included in maps by default. Unless configured otherwise,\n * this returns a collection containing an instance of each of the following\n * controls:\n * * {@link module:ol/control/Zoom~Zoom}\n * * {@link module:ol/control/Rotate~Rotate}\n * * {@link module:ol/control/Attribution~Attribution}\n *\n * @param {module:ol/control/util~DefaultsOptions=} opt_options\n * Defaults options.\n * @return {module:ol/Collection<module:ol/control/Control>}\n * Controls.\n * @function module:ol/control.defaults\n * @api\n */\nexport function defaults(opt_options) {\n\n  const options = opt_options ? opt_options : {};\n\n  const controls = new Collection();\n\n  const zoomControl = options.zoom !== undefined ? options.zoom : true;\n  if (zoomControl) {\n    controls.push(new Zoom(options.zoomOptions));\n  }\n\n  const rotateControl = options.rotate !== undefined ? options.rotate : true;\n  if (rotateControl) {\n    controls.push(new Rotate(options.rotateOptions));\n  }\n\n  const attributionControl = options.attribution !== undefined ?\n    options.attribution : true;\n  if (attributionControl) {\n    controls.push(new Attribution(options.attributionOptions));\n  }\n\n  return controls;\n}\n","/**\n * @module ol/interaction\n */\nimport Collection from './Collection.js';\nimport Kinetic from './Kinetic.js';\nimport DoubleClickZoom from './interaction/DoubleClickZoom.js';\nimport DragPan from './interaction/DragPan.js';\nimport DragRotate from './interaction/DragRotate.js';\nimport DragZoom from './interaction/DragZoom.js';\nimport KeyboardPan from './interaction/KeyboardPan.js';\nimport KeyboardZoom from './interaction/KeyboardZoom.js';\nimport MouseWheelZoom from './interaction/MouseWheelZoom.js';\nimport PinchRotate from './interaction/PinchRotate.js';\nimport PinchZoom from './interaction/PinchZoom.js';\nimport {focus} from './events/condition.js';\n\nexport {default as DoubleClickZoom} from './interaction/DoubleClickZoom.js';\nexport {default as DragAndDrop} from './interaction/DragAndDrop.js';\nexport {default as DragBox} from './interaction/DragBox.js';\nexport {default as DragPan} from './interaction/DragPan.js';\nexport {default as DragRotate} from './interaction/DragRotate.js';\nexport {default as DragRotateAndZoom} from './interaction/DragRotateAndZoom.js';\nexport {default as DragZoom} from './interaction/DragZoom.js';\nexport {default as Draw} from './interaction/Draw.js';\nexport {default as Extent} from './interaction/Extent.js';\nexport {default as Interaction} from './interaction/Interaction.js';\nexport {default as KeyboardPan} from './interaction/KeyboardPan.js';\nexport {default as KeyboardZoom} from './interaction/KeyboardZoom.js';\nexport {default as Modify} from './interaction/Modify.js';\nexport {default as MouseWheelZoom} from './interaction/MouseWheelZoom.js';\nexport {default as PinchRotate} from './interaction/PinchRotate.js';\nexport {default as PinchZoom} from './interaction/PinchZoom.js';\nexport {default as Pointer} from './interaction/Pointer.js';\nexport {default as Select} from './interaction/Select.js';\nexport {default as Snap} from './interaction/Snap.js';\nexport {default as Translate} from './interaction/Translate.js';\n\n\n/**\n * @typedef {Object} DefaultsOptions\n * @property {boolean} [altShiftDragRotate=true] Whether Alt-Shift-drag rotate is\n * desired.\n * @property {boolean} [onFocusOnly=false] Interact only when the map has the\n * focus. This affects the `MouseWheelZoom` and `DragPan` interactions and is\n * useful when page scroll is desired for maps that do not have the browser's\n * focus.\n * @property {boolean} [constrainResolution=false] Zoom to the closest integer\n * zoom level after the wheel/trackpad or pinch gesture ends.\n * @property {boolean} [doubleClickZoom=true] Whether double click zoom is\n * desired.\n * @property {boolean} [keyboard=true] Whether keyboard interaction is desired.\n * @property {boolean} [mouseWheelZoom=true] Whether mousewheel zoom is desired.\n * @property {boolean} [shiftDragZoom=true] Whether Shift-drag zoom is desired.\n * @property {boolean} [dragPan=true] Whether drag pan is desired.\n * @property {boolean} [pinchRotate=true] Whether pinch rotate is desired.\n * @property {boolean} [pinchZoom=true] Whether pinch zoom is desired.\n * @property {number} [zoomDelta] Zoom level delta when using keyboard or\n * mousewheel zoom.\n * @property {number} [zoomDuration] Duration of the zoom animation in\n * milliseconds.\n */\n\n\n/**\n * Set of interactions included in maps by default. Specific interactions can be\n * excluded by setting the appropriate option to false in the constructor\n * options, but the order of the interactions is fixed.  If you want to specify\n * a different order for interactions, you will need to create your own\n * {@link module:ol/interaction/Interaction} instances and insert\n * them into a {@link module:ol/Collection} in the order you want\n * before creating your {@link module:ol/Map~Map} instance. The default set of\n * interactions, in sequence, is:\n * * {@link module:ol/interaction/DragRotate~DragRotate}\n * * {@link module:ol/interaction/DoubleClickZoom~DoubleClickZoom}\n * * {@link module:ol/interaction/DragPan~DragPan}\n * * {@link module:ol/interaction/PinchRotate~PinchRotate}\n * * {@link module:ol/interaction/PinchZoom~PinchZoom}\n * * {@link module:ol/interaction/KeyboardPan~KeyboardPan}\n * * {@link module:ol/interaction/KeyboardZoom~KeyboardZoom}\n * * {@link module:ol/interaction/MouseWheelZoom~MouseWheelZoom}\n * * {@link module:ol/interaction/DragZoom~DragZoom}\n *\n * @param {module:ol/interaction/Interaction~DefaultsOptions=} opt_options\n * Defaults options.\n * @return {module:ol/Collection<module:ol/interaction/Interaction>}\n * A collection of interactions to be used with the {@link module:ol/Map~Map}\n * constructor's `interactions` option.\n * @api\n */\nexport function defaults(opt_options) {\n\n  const options = opt_options ? opt_options : {};\n\n  const interactions = new Collection();\n\n  const kinetic = new Kinetic(-0.005, 0.05, 100);\n\n  const altShiftDragRotate = options.altShiftDragRotate !== undefined ?\n    options.altShiftDragRotate : true;\n  if (altShiftDragRotate) {\n    interactions.push(new DragRotate());\n  }\n\n  const doubleClickZoom = options.doubleClickZoom !== undefined ?\n    options.doubleClickZoom : true;\n  if (doubleClickZoom) {\n    interactions.push(new DoubleClickZoom({\n      delta: options.zoomDelta,\n      duration: options.zoomDuration\n    }));\n  }\n\n  const dragPan = options.dragPan !== undefined ? options.dragPan : true;\n  if (dragPan) {\n    interactions.push(new DragPan({\n      condition: options.onFocusOnly ? focus : undefined,\n      kinetic: kinetic\n    }));\n  }\n\n  const pinchRotate = options.pinchRotate !== undefined ? options.pinchRotate :\n    true;\n  if (pinchRotate) {\n    interactions.push(new PinchRotate());\n  }\n\n  const pinchZoom = options.pinchZoom !== undefined ? options.pinchZoom : true;\n  if (pinchZoom) {\n    interactions.push(new PinchZoom({\n      constrainResolution: options.constrainResolution,\n      duration: options.zoomDuration\n    }));\n  }\n\n  const keyboard = options.keyboard !== undefined ? options.keyboard : true;\n  if (keyboard) {\n    interactions.push(new KeyboardPan());\n    interactions.push(new KeyboardZoom({\n      delta: options.zoomDelta,\n      duration: options.zoomDuration\n    }));\n  }\n\n  const mouseWheelZoom = options.mouseWheelZoom !== undefined ?\n    options.mouseWheelZoom : true;\n  if (mouseWheelZoom) {\n    interactions.push(new MouseWheelZoom({\n      condition: options.onFocusOnly ? focus : undefined,\n      constrainResolution: options.constrainResolution,\n      duration: options.zoomDuration\n    }));\n  }\n\n  const shiftDragZoom = options.shiftDragZoom !== undefined ?\n    options.shiftDragZoom : true;\n  if (shiftDragZoom) {\n    interactions.push(new DragZoom({\n      duration: options.zoomDuration\n    }));\n  }\n\n  return interactions;\n\n}\n","/**\n * @module ol/Disposable\n */\n\n/**\n * @classdesc\n * Objects that need to clean up after themselves.\n */\nclass Disposable {\n\n  constructor() {\n    /**\n     * The object has already been disposed.\n     * @type {boolean}\n     * @private\n     */\n    this.disposed_ = false;\n  }\n\n  /**\n   * Clean up.\n   */\n  dispose() {\n    if (!this.disposed_) {\n      this.disposed_ = true;\n      this.disposeInternal();\n    }\n  }\n\n  /**\n   * Extension point for disposable objects.\n   * @protected\n   */\n  disposeInternal() {}\n}\n\nexport default Disposable;\n","/**\n * @module ol/geom/flat/area\n */\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @return {number} Area.\n */\nexport function linearRing(flatCoordinates, offset, end, stride) {\n  let twiceArea = 0;\n  let x1 = flatCoordinates[end - stride];\n  let y1 = flatCoordinates[end - stride + 1];\n  for (; offset < end; offset += stride) {\n    const x2 = flatCoordinates[offset];\n    const y2 = flatCoordinates[offset + 1];\n    twiceArea += y1 * x2 - x1 * y2;\n    x1 = x2;\n    y1 = y2;\n  }\n  return twiceArea / 2;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @return {number} Area.\n */\nexport function linearRings(flatCoordinates, offset, ends, stride) {\n  let area = 0;\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    area += linearRing(flatCoordinates, offset, end, stride);\n    offset = end;\n  }\n  return area;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @return {number} Area.\n */\nexport function linearRingss(flatCoordinates, offset, endss, stride) {\n  let area = 0;\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    area += linearRings(flatCoordinates, offset, ends, stride);\n    offset = ends[ends.length - 1];\n  }\n  return area;\n}\n","/**\n * @module ol/geom/MultiPoint\n */\nimport {extend} from '../array.js';\nimport {closestSquaredDistanceXY, containsXY} from '../extent.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport Point from '../geom/Point.js';\nimport SimpleGeometry from '../geom/SimpleGeometry.js';\nimport {deflateCoordinates} from '../geom/flat/deflate.js';\nimport {inflateCoordinates} from '../geom/flat/inflate.js';\nimport {squaredDistance as squaredDx} from '../math.js';\n\n/**\n * @classdesc\n * Multi-point geometry.\n *\n * @api\n */\nclass MultiPoint extends SimpleGeometry {\n\n  /**\n   * @param {Array<module:ol/coordinate~Coordinate>|Array<number>} coordinates Coordinates.\n   *     For internal use, flat coordinates in combination with `opt_layout` are also accepted.\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   */\n  constructor(coordinates, opt_layout) {\n    super();\n    if (opt_layout && !Array.isArray(coordinates[0])) {\n      this.setFlatCoordinates(opt_layout, coordinates);\n    } else {\n      this.setCoordinates(coordinates, opt_layout);\n    }\n  }\n\n  /**\n   * Append the passed point to this multipoint.\n   * @param {module:ol/geom/Point} point Point.\n   * @api\n   */\n  appendPoint(point) {\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = point.getFlatCoordinates().slice();\n    } else {\n      extend(this.flatCoordinates, point.getFlatCoordinates());\n    }\n    this.changed();\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!module:ol/geom/MultiPoint} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    const multiPoint = new MultiPoint(this.flatCoordinates.slice(), this.layout);\n    return multiPoint;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    const flatCoordinates = this.flatCoordinates;\n    const stride = this.stride;\n    for (let i = 0, ii = flatCoordinates.length; i < ii; i += stride) {\n      const squaredDistance = squaredDx(\n        x, y, flatCoordinates[i], flatCoordinates[i + 1]);\n      if (squaredDistance < minSquaredDistance) {\n        minSquaredDistance = squaredDistance;\n        for (let j = 0; j < stride; ++j) {\n          closestPoint[j] = flatCoordinates[i + j];\n        }\n        closestPoint.length = stride;\n      }\n    }\n    return minSquaredDistance;\n  }\n\n  /**\n   * Return the coordinates of the multipoint.\n   * @return {Array<module:ol/coordinate~Coordinate>} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates() {\n    return inflateCoordinates(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);\n  }\n\n  /**\n   * Return the point at the specified index.\n   * @param {number} index Index.\n   * @return {module:ol/geom/Point} Point.\n   * @api\n   */\n  getPoint(index) {\n    const n = !this.flatCoordinates ? 0 : this.flatCoordinates.length / this.stride;\n    if (index < 0 || n <= index) {\n      return null;\n    }\n    return new Point(this.flatCoordinates.slice(\n      index * this.stride, (index + 1) * this.stride), this.layout);\n  }\n\n  /**\n   * Return the points of this multipoint.\n   * @return {Array<module:ol/geom/Point>} Points.\n   * @api\n   */\n  getPoints() {\n    const flatCoordinates = this.flatCoordinates;\n    const layout = this.layout;\n    const stride = this.stride;\n    /** @type {Array<module:ol/geom/Point>} */\n    const points = [];\n    for (let i = 0, ii = flatCoordinates.length; i < ii; i += stride) {\n      const point = new Point(flatCoordinates.slice(i, i + stride), layout);\n      points.push(point);\n    }\n    return points;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.MULTI_POINT;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    const flatCoordinates = this.flatCoordinates;\n    const stride = this.stride;\n    for (let i = 0, ii = flatCoordinates.length; i < ii; i += stride) {\n      const x = flatCoordinates[i];\n      const y = flatCoordinates[i + 1];\n      if (containsXY(extent, x, y)) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /**\n   * Set the coordinates of the multipoint.\n   * @param {!Array<module:ol/coordinate~Coordinate>} coordinates Coordinates.\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   * @override\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 1);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    this.flatCoordinates.length = deflateCoordinates(\n      this.flatCoordinates, 0, coordinates, this.stride);\n    this.changed();\n  }\n}\n\n\nexport default MultiPoint;\n","'use strict';\n\nmodule.exports = rbush;\nmodule.exports.default = rbush;\n\nvar quickselect = require('quickselect');\n\nfunction rbush(maxEntries, format) {\n    if (!(this instanceof rbush)) return new rbush(maxEntries, format);\n\n    // max entries in a node is 9 by default; min node fill is 40% for best performance\n    this._maxEntries = Math.max(4, maxEntries || 9);\n    this._minEntries = Math.max(2, Math.ceil(this._maxEntries * 0.4));\n\n    if (format) {\n        this._initFormat(format);\n    }\n\n    this.clear();\n}\n\nrbush.prototype = {\n\n    all: function () {\n        return this._all(this.data, []);\n    },\n\n    search: function (bbox) {\n\n        var node = this.data,\n            result = [],\n            toBBox = this.toBBox;\n\n        if (!intersects(bbox, node)) return result;\n\n        var nodesToSearch = [],\n            i, len, child, childBBox;\n\n        while (node) {\n            for (i = 0, len = node.children.length; i < len; i++) {\n\n                child = node.children[i];\n                childBBox = node.leaf ? toBBox(child) : child;\n\n                if (intersects(bbox, childBBox)) {\n                    if (node.leaf) result.push(child);\n                    else if (contains(bbox, childBBox)) this._all(child, result);\n                    else nodesToSearch.push(child);\n                }\n            }\n            node = nodesToSearch.pop();\n        }\n\n        return result;\n    },\n\n    collides: function (bbox) {\n\n        var node = this.data,\n            toBBox = this.toBBox;\n\n        if (!intersects(bbox, node)) return false;\n\n        var nodesToSearch = [],\n            i, len, child, childBBox;\n\n        while (node) {\n            for (i = 0, len = node.children.length; i < len; i++) {\n\n                child = node.children[i];\n                childBBox = node.leaf ? toBBox(child) : child;\n\n                if (intersects(bbox, childBBox)) {\n                    if (node.leaf || contains(bbox, childBBox)) return true;\n                    nodesToSearch.push(child);\n                }\n            }\n            node = nodesToSearch.pop();\n        }\n\n        return false;\n    },\n\n    load: function (data) {\n        if (!(data && data.length)) return this;\n\n        if (data.length < this._minEntries) {\n            for (var i = 0, len = data.length; i < len; i++) {\n                this.insert(data[i]);\n            }\n            return this;\n        }\n\n        // recursively build the tree with the given data from scratch using OMT algorithm\n        var node = this._build(data.slice(), 0, data.length - 1, 0);\n\n        if (!this.data.children.length) {\n            // save as is if tree is empty\n            this.data = node;\n\n        } else if (this.data.height === node.height) {\n            // split root if trees have the same height\n            this._splitRoot(this.data, node);\n\n        } else {\n            if (this.data.height < node.height) {\n                // swap trees if inserted one is bigger\n                var tmpNode = this.data;\n                this.data = node;\n                node = tmpNode;\n            }\n\n            // insert the small tree into the large tree at appropriate level\n            this._insert(node, this.data.height - node.height - 1, true);\n        }\n\n        return this;\n    },\n\n    insert: function (item) {\n        if (item) this._insert(item, this.data.height - 1);\n        return this;\n    },\n\n    clear: function () {\n        this.data = createNode([]);\n        return this;\n    },\n\n    remove: function (item, equalsFn) {\n        if (!item) return this;\n\n        var node = this.data,\n            bbox = this.toBBox(item),\n            path = [],\n            indexes = [],\n            i, parent, index, goingUp;\n\n        // depth-first iterative tree traversal\n        while (node || path.length) {\n\n            if (!node) { // go up\n                node = path.pop();\n                parent = path[path.length - 1];\n                i = indexes.pop();\n                goingUp = true;\n            }\n\n            if (node.leaf) { // check current node\n                index = findItem(item, node.children, equalsFn);\n\n                if (index !== -1) {\n                    // item found, remove the item and condense tree upwards\n                    node.children.splice(index, 1);\n                    path.push(node);\n                    this._condense(path);\n                    return this;\n                }\n            }\n\n            if (!goingUp && !node.leaf && contains(node, bbox)) { // go down\n                path.push(node);\n                indexes.push(i);\n                i = 0;\n                parent = node;\n                node = node.children[0];\n\n            } else if (parent) { // go right\n                i++;\n                node = parent.children[i];\n                goingUp = false;\n\n            } else node = null; // nothing found\n        }\n\n        return this;\n    },\n\n    toBBox: function (item) { return item; },\n\n    compareMinX: compareNodeMinX,\n    compareMinY: compareNodeMinY,\n\n    toJSON: function () { return this.data; },\n\n    fromJSON: function (data) {\n        this.data = data;\n        return this;\n    },\n\n    _all: function (node, result) {\n        var nodesToSearch = [];\n        while (node) {\n            if (node.leaf) result.push.apply(result, node.children);\n            else nodesToSearch.push.apply(nodesToSearch, node.children);\n\n            node = nodesToSearch.pop();\n        }\n        return result;\n    },\n\n    _build: function (items, left, right, height) {\n\n        var N = right - left + 1,\n            M = this._maxEntries,\n            node;\n\n        if (N <= M) {\n            // reached leaf level; return leaf\n            node = createNode(items.slice(left, right + 1));\n            calcBBox(node, this.toBBox);\n            return node;\n        }\n\n        if (!height) {\n            // target height of the bulk-loaded tree\n            height = Math.ceil(Math.log(N) / Math.log(M));\n\n            // target number of root entries to maximize storage utilization\n            M = Math.ceil(N / Math.pow(M, height - 1));\n        }\n\n        node = createNode([]);\n        node.leaf = false;\n        node.height = height;\n\n        // split the items into M mostly square tiles\n\n        var N2 = Math.ceil(N / M),\n            N1 = N2 * Math.ceil(Math.sqrt(M)),\n            i, j, right2, right3;\n\n        multiSelect(items, left, right, N1, this.compareMinX);\n\n        for (i = left; i <= right; i += N1) {\n\n            right2 = Math.min(i + N1 - 1, right);\n\n            multiSelect(items, i, right2, N2, this.compareMinY);\n\n            for (j = i; j <= right2; j += N2) {\n\n                right3 = Math.min(j + N2 - 1, right2);\n\n                // pack each entry recursively\n                node.children.push(this._build(items, j, right3, height - 1));\n            }\n        }\n\n        calcBBox(node, this.toBBox);\n\n        return node;\n    },\n\n    _chooseSubtree: function (bbox, node, level, path) {\n\n        var i, len, child, targetNode, area, enlargement, minArea, minEnlargement;\n\n        while (true) {\n            path.push(node);\n\n            if (node.leaf || path.length - 1 === level) break;\n\n            minArea = minEnlargement = Infinity;\n\n            for (i = 0, len = node.children.length; i < len; i++) {\n                child = node.children[i];\n                area = bboxArea(child);\n                enlargement = enlargedArea(bbox, child) - area;\n\n                // choose entry with the least area enlargement\n                if (enlargement < minEnlargement) {\n                    minEnlargement = enlargement;\n                    minArea = area < minArea ? area : minArea;\n                    targetNode = child;\n\n                } else if (enlargement === minEnlargement) {\n                    // otherwise choose one with the smallest area\n                    if (area < minArea) {\n                        minArea = area;\n                        targetNode = child;\n                    }\n                }\n            }\n\n            node = targetNode || node.children[0];\n        }\n\n        return node;\n    },\n\n    _insert: function (item, level, isNode) {\n\n        var toBBox = this.toBBox,\n            bbox = isNode ? item : toBBox(item),\n            insertPath = [];\n\n        // find the best node for accommodating the item, saving all nodes along the path too\n        var node = this._chooseSubtree(bbox, this.data, level, insertPath);\n\n        // put the item into the node\n        node.children.push(item);\n        extend(node, bbox);\n\n        // split on node overflow; propagate upwards if necessary\n        while (level >= 0) {\n            if (insertPath[level].children.length > this._maxEntries) {\n                this._split(insertPath, level);\n                level--;\n            } else break;\n        }\n\n        // adjust bboxes along the insertion path\n        this._adjustParentBBoxes(bbox, insertPath, level);\n    },\n\n    // split overflowed node into two\n    _split: function (insertPath, level) {\n\n        var node = insertPath[level],\n            M = node.children.length,\n            m = this._minEntries;\n\n        this._chooseSplitAxis(node, m, M);\n\n        var splitIndex = this._chooseSplitIndex(node, m, M);\n\n        var newNode = createNode(node.children.splice(splitIndex, node.children.length - splitIndex));\n        newNode.height = node.height;\n        newNode.leaf = node.leaf;\n\n        calcBBox(node, this.toBBox);\n        calcBBox(newNode, this.toBBox);\n\n        if (level) insertPath[level - 1].children.push(newNode);\n        else this._splitRoot(node, newNode);\n    },\n\n    _splitRoot: function (node, newNode) {\n        // split root node\n        this.data = createNode([node, newNode]);\n        this.data.height = node.height + 1;\n        this.data.leaf = false;\n        calcBBox(this.data, this.toBBox);\n    },\n\n    _chooseSplitIndex: function (node, m, M) {\n\n        var i, bbox1, bbox2, overlap, area, minOverlap, minArea, index;\n\n        minOverlap = minArea = Infinity;\n\n        for (i = m; i <= M - m; i++) {\n            bbox1 = distBBox(node, 0, i, this.toBBox);\n            bbox2 = distBBox(node, i, M, this.toBBox);\n\n            overlap = intersectionArea(bbox1, bbox2);\n            area = bboxArea(bbox1) + bboxArea(bbox2);\n\n            // choose distribution with minimum overlap\n            if (overlap < minOverlap) {\n                minOverlap = overlap;\n                index = i;\n\n                minArea = area < minArea ? area : minArea;\n\n            } else if (overlap === minOverlap) {\n                // otherwise choose distribution with minimum area\n                if (area < minArea) {\n                    minArea = area;\n                    index = i;\n                }\n            }\n        }\n\n        return index;\n    },\n\n    // sorts node children by the best axis for split\n    _chooseSplitAxis: function (node, m, M) {\n\n        var compareMinX = node.leaf ? this.compareMinX : compareNodeMinX,\n            compareMinY = node.leaf ? this.compareMinY : compareNodeMinY,\n            xMargin = this._allDistMargin(node, m, M, compareMinX),\n            yMargin = this._allDistMargin(node, m, M, compareMinY);\n\n        // if total distributions margin value is minimal for x, sort by minX,\n        // otherwise it's already sorted by minY\n        if (xMargin < yMargin) node.children.sort(compareMinX);\n    },\n\n    // total margin of all possible split distributions where each node is at least m full\n    _allDistMargin: function (node, m, M, compare) {\n\n        node.children.sort(compare);\n\n        var toBBox = this.toBBox,\n            leftBBox = distBBox(node, 0, m, toBBox),\n            rightBBox = distBBox(node, M - m, M, toBBox),\n            margin = bboxMargin(leftBBox) + bboxMargin(rightBBox),\n            i, child;\n\n        for (i = m; i < M - m; i++) {\n            child = node.children[i];\n            extend(leftBBox, node.leaf ? toBBox(child) : child);\n            margin += bboxMargin(leftBBox);\n        }\n\n        for (i = M - m - 1; i >= m; i--) {\n            child = node.children[i];\n            extend(rightBBox, node.leaf ? toBBox(child) : child);\n            margin += bboxMargin(rightBBox);\n        }\n\n        return margin;\n    },\n\n    _adjustParentBBoxes: function (bbox, path, level) {\n        // adjust bboxes along the given tree path\n        for (var i = level; i >= 0; i--) {\n            extend(path[i], bbox);\n        }\n    },\n\n    _condense: function (path) {\n        // go through the path, removing empty nodes and updating bboxes\n        for (var i = path.length - 1, siblings; i >= 0; i--) {\n            if (path[i].children.length === 0) {\n                if (i > 0) {\n                    siblings = path[i - 1].children;\n                    siblings.splice(siblings.indexOf(path[i]), 1);\n\n                } else this.clear();\n\n            } else calcBBox(path[i], this.toBBox);\n        }\n    },\n\n    _initFormat: function (format) {\n        // data format (minX, minY, maxX, maxY accessors)\n\n        // uses eval-type function compilation instead of just accepting a toBBox function\n        // because the algorithms are very sensitive to sorting functions performance,\n        // so they should be dead simple and without inner calls\n\n        var compareArr = ['return a', ' - b', ';'];\n\n        this.compareMinX = new Function('a', 'b', compareArr.join(format[0]));\n        this.compareMinY = new Function('a', 'b', compareArr.join(format[1]));\n\n        this.toBBox = new Function('a',\n            'return {minX: a' + format[0] +\n            ', minY: a' + format[1] +\n            ', maxX: a' + format[2] +\n            ', maxY: a' + format[3] + '};');\n    }\n};\n\nfunction findItem(item, items, equalsFn) {\n    if (!equalsFn) return items.indexOf(item);\n\n    for (var i = 0; i < items.length; i++) {\n        if (equalsFn(item, items[i])) return i;\n    }\n    return -1;\n}\n\n// calculate node's bbox from bboxes of its children\nfunction calcBBox(node, toBBox) {\n    distBBox(node, 0, node.children.length, toBBox, node);\n}\n\n// min bounding rectangle of node children from k to p-1\nfunction distBBox(node, k, p, toBBox, destNode) {\n    if (!destNode) destNode = createNode(null);\n    destNode.minX = Infinity;\n    destNode.minY = Infinity;\n    destNode.maxX = -Infinity;\n    destNode.maxY = -Infinity;\n\n    for (var i = k, child; i < p; i++) {\n        child = node.children[i];\n        extend(destNode, node.leaf ? toBBox(child) : child);\n    }\n\n    return destNode;\n}\n\nfunction extend(a, b) {\n    a.minX = Math.min(a.minX, b.minX);\n    a.minY = Math.min(a.minY, b.minY);\n    a.maxX = Math.max(a.maxX, b.maxX);\n    a.maxY = Math.max(a.maxY, b.maxY);\n    return a;\n}\n\nfunction compareNodeMinX(a, b) { return a.minX - b.minX; }\nfunction compareNodeMinY(a, b) { return a.minY - b.minY; }\n\nfunction bboxArea(a)   { return (a.maxX - a.minX) * (a.maxY - a.minY); }\nfunction bboxMargin(a) { return (a.maxX - a.minX) + (a.maxY - a.minY); }\n\nfunction enlargedArea(a, b) {\n    return (Math.max(b.maxX, a.maxX) - Math.min(b.minX, a.minX)) *\n           (Math.max(b.maxY, a.maxY) - Math.min(b.minY, a.minY));\n}\n\nfunction intersectionArea(a, b) {\n    var minX = Math.max(a.minX, b.minX),\n        minY = Math.max(a.minY, b.minY),\n        maxX = Math.min(a.maxX, b.maxX),\n        maxY = Math.min(a.maxY, b.maxY);\n\n    return Math.max(0, maxX - minX) *\n           Math.max(0, maxY - minY);\n}\n\nfunction contains(a, b) {\n    return a.minX <= b.minX &&\n           a.minY <= b.minY &&\n           b.maxX <= a.maxX &&\n           b.maxY <= a.maxY;\n}\n\nfunction intersects(a, b) {\n    return b.minX <= a.maxX &&\n           b.minY <= a.maxY &&\n           b.maxX >= a.minX &&\n           b.maxY >= a.minY;\n}\n\nfunction createNode(children) {\n    return {\n        children: children,\n        height: 1,\n        leaf: true,\n        minX: Infinity,\n        minY: Infinity,\n        maxX: -Infinity,\n        maxY: -Infinity\n    };\n}\n\n// sort an array so that items come in groups of n unsorted items, with groups sorted between each other;\n// combines selection algorithm with binary divide & conquer approach\n\nfunction multiSelect(arr, left, right, n, compare) {\n    var stack = [left, right],\n        mid;\n\n    while (stack.length) {\n        right = stack.pop();\n        left = stack.pop();\n\n        if (right - left <= n) continue;\n\n        mid = left + Math.ceil((right - left) / n / 2) * n;\n        quickselect(arr, mid, left, right, compare);\n\n        stack.push(left, mid, mid, right);\n    }\n}\n","/**\n * @module ol/style/IconAnchorUnits\n */\n\n/**\n * Icon anchor units. One of 'fraction', 'pixels'.\n * @enum {string}\n */\nexport default {\n  FRACTION: 'fraction',\n  PIXELS: 'pixels'\n};\n","/**\n * @module ol/style/IconImage\n */\n\nimport {createCanvasContext2D} from '../dom.js';\nimport {listenOnce, unlistenByKey} from '../events.js';\nimport EventTarget from '../events/Target.js';\nimport EventType from '../events/EventType.js';\nimport ImageState from '../ImageState.js';\nimport {shared as iconImageCache} from '../style/IconImageCache.js';\n\nclass IconImage extends EventTarget {\n  /**\n   * @param {HTMLImageElement|HTMLCanvasElement} image Image.\n   * @param {string|undefined} src Src.\n   * @param {module:ol/size~Size} size Size.\n   * @param {?string} crossOrigin Cross origin.\n   * @param {module:ol/ImageState} imageState Image state.\n   * @param {module:ol/color~Color} color Color.\n   */\n  constructor(image, src, size, crossOrigin, imageState, color) {\n\n    super();\n\n    /**\n     * @private\n     * @type {HTMLImageElement|HTMLCanvasElement}\n     */\n    this.hitDetectionImage_ = null;\n\n    /**\n     * @private\n     * @type {HTMLImageElement|HTMLCanvasElement}\n     */\n    this.image_ = !image ? new Image() : image;\n\n    if (crossOrigin !== null) {\n      this.image_.crossOrigin = crossOrigin;\n    }\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement}\n     */\n    this.canvas_ = color ?\n      /** @type {HTMLCanvasElement} */ (document.createElement('canvas')) :\n      null;\n\n    /**\n     * @private\n     * @type {module:ol/color~Color}\n     */\n    this.color_ = color;\n\n    /**\n     * @private\n     * @type {Array<module:ol/events~EventsKey>}\n     */\n    this.imageListenerKeys_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/ImageState}\n     */\n    this.imageState_ = imageState;\n\n    /**\n     * @private\n     * @type {module:ol/size~Size}\n     */\n    this.size_ = size;\n\n    /**\n     * @private\n     * @type {string|undefined}\n     */\n    this.src_ = src;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.tainting_ = false;\n    if (this.imageState_ == ImageState.LOADED) {\n      this.determineTainting_();\n    }\n\n  }\n\n  /**\n   * @private\n   */\n  determineTainting_() {\n    const context = createCanvasContext2D(1, 1);\n    try {\n      context.drawImage(this.image_, 0, 0);\n      context.getImageData(0, 0, 1, 1);\n    } catch (e) {\n      this.tainting_ = true;\n    }\n  }\n\n  /**\n   * @private\n   */\n  dispatchChangeEvent_() {\n    this.dispatchEvent(EventType.CHANGE);\n  }\n\n  /**\n   * @private\n   */\n  handleImageError_() {\n    this.imageState_ = ImageState.ERROR;\n    this.unlistenImage_();\n    this.dispatchChangeEvent_();\n  }\n\n  /**\n   * @private\n   */\n  handleImageLoad_() {\n    this.imageState_ = ImageState.LOADED;\n    if (this.size_) {\n      this.image_.width = this.size_[0];\n      this.image_.height = this.size_[1];\n    }\n    this.size_ = [this.image_.width, this.image_.height];\n    this.unlistenImage_();\n    this.determineTainting_();\n    this.replaceColor_();\n    this.dispatchChangeEvent_();\n  }\n\n  /**\n   * @param {number} pixelRatio Pixel ratio.\n   * @return {HTMLImageElement|HTMLCanvasElement} Image or Canvas element.\n   */\n  getImage(pixelRatio) {\n    return this.canvas_ ? this.canvas_ : this.image_;\n  }\n\n  /**\n   * @return {module:ol/ImageState} Image state.\n   */\n  getImageState() {\n    return this.imageState_;\n  }\n\n  /**\n   * @param {number} pixelRatio Pixel ratio.\n   * @return {HTMLImageElement|HTMLCanvasElement} Image element.\n   */\n  getHitDetectionImage(pixelRatio) {\n    if (!this.hitDetectionImage_) {\n      if (this.tainting_) {\n        const width = this.size_[0];\n        const height = this.size_[1];\n        const context = createCanvasContext2D(width, height);\n        context.fillRect(0, 0, width, height);\n        this.hitDetectionImage_ = context.canvas;\n      } else {\n        this.hitDetectionImage_ = this.image_;\n      }\n    }\n    return this.hitDetectionImage_;\n  }\n\n  /**\n   * @return {module:ol/size~Size} Image size.\n   */\n  getSize() {\n    return this.size_;\n  }\n\n  /**\n   * @return {string|undefined} Image src.\n   */\n  getSrc() {\n    return this.src_;\n  }\n\n  /**\n   * Load not yet loaded URI.\n   */\n  load() {\n    if (this.imageState_ == ImageState.IDLE) {\n      this.imageState_ = ImageState.LOADING;\n      this.imageListenerKeys_ = [\n        listenOnce(this.image_, EventType.ERROR,\n          this.handleImageError_, this),\n        listenOnce(this.image_, EventType.LOAD,\n          this.handleImageLoad_, this)\n      ];\n      try {\n        this.image_.src = this.src_;\n      } catch (e) {\n        this.handleImageError_();\n      }\n    }\n  }\n\n  /**\n   * @private\n   */\n  replaceColor_() {\n    if (this.tainting_ || this.color_ === null) {\n      return;\n    }\n\n    this.canvas_.width = this.image_.width;\n    this.canvas_.height = this.image_.height;\n\n    const ctx = this.canvas_.getContext('2d');\n    ctx.drawImage(this.image_, 0, 0);\n\n    const imgData = ctx.getImageData(0, 0, this.image_.width, this.image_.height);\n    const data = imgData.data;\n    const r = this.color_[0] / 255.0;\n    const g = this.color_[1] / 255.0;\n    const b = this.color_[2] / 255.0;\n\n    for (let i = 0, ii = data.length; i < ii; i += 4) {\n      data[i] *= r;\n      data[i + 1] *= g;\n      data[i + 2] *= b;\n    }\n    ctx.putImageData(imgData, 0, 0);\n  }\n\n  /**\n   * Discards event handlers which listen for load completion or errors.\n   *\n   * @private\n   */\n  unlistenImage_() {\n    this.imageListenerKeys_.forEach(unlistenByKey);\n    this.imageListenerKeys_ = null;\n  }\n}\n\n\n/**\n * @param {HTMLImageElement|HTMLCanvasElement} image Image.\n * @param {string} src Src.\n * @param {module:ol/size~Size} size Size.\n * @param {?string} crossOrigin Cross origin.\n * @param {module:ol/ImageState} imageState Image state.\n * @param {module:ol/color~Color} color Color.\n * @return {module:ol/style/IconImage} Icon image.\n */\nexport function get(image, src, size, crossOrigin, imageState, color) {\n  let iconImage = iconImageCache.get(src, crossOrigin, color);\n  if (!iconImage) {\n    iconImage = new IconImage(image, src, size, crossOrigin, imageState, color);\n    iconImageCache.set(src, crossOrigin, color, iconImage);\n  }\n  return iconImage;\n}\n\n\nexport default IconImage;\n","/**\n * @module ol/style/IconOrigin\n */\n\n/**\n * Icon origin. One of 'bottom-left', 'bottom-right', 'top-left', 'top-right'.\n * @enum {string}\n */\nexport default {\n  BOTTOM_LEFT: 'bottom-left',\n  BOTTOM_RIGHT: 'bottom-right',\n  TOP_LEFT: 'top-left',\n  TOP_RIGHT: 'top-right'\n};\n","/**\n * @module ol/style/Icon\n */\nimport {getUid} from '../util.js';\nimport ImageState from '../ImageState.js';\nimport {assert} from '../asserts.js';\nimport {asArray} from '../color.js';\nimport {listen, unlisten} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport IconAnchorUnits from '../style/IconAnchorUnits.js';\nimport {get as getIconImage} from '../style/IconImage.js';\nimport IconOrigin from '../style/IconOrigin.js';\nimport ImageStyle from '../style/Image.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {Array<number>} [anchor=[0.5, 0.5]] Anchor. Default value is the icon center.\n * @property {module:ol/style/IconOrigin} [anchorOrigin] Origin of the anchor: `bottom-left`, `bottom-right`,\n * `top-left` or `top-right`. Default is `top-left`.\n * @property {module:ol/style/IconAnchorUnits} [anchorXUnits] Units in which the anchor x value is\n * specified. A value of `'fraction'` indicates the x value is a fraction of the icon. A value of `'pixels'` indicates\n * the x value in pixels. Default is `'fraction'`.\n * @property {module:ol/style/IconAnchorUnits} [anchorYUnits] Units in which the anchor y value is\n * specified. A value of `'fraction'` indicates the y value is a fraction of the icon. A value of `'pixels'` indicates\n * the y value in pixels. Default is `'fraction'`.\n * @property {module:ol/color~Color|string} [color] Color to tint the icon. If not specified,\n * the icon will be left as is.\n * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images. Note that you must provide a\n * `crossOrigin` value if you are using the WebGL renderer or if you want to access pixel data with the Canvas renderer.\n * See https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.\n * @property {HTMLImageElement|HTMLCanvasElement} [img] Image object for the icon. If the `src` option is not provided then the\n * provided image must already be loaded. And in that case, it is required\n * to provide the size of the image, with the `imgSize` option.\n * @property {Array<number>} [offset=[0, 0]] Offset, which, together with the size and the offset origin, define the\n * sub-rectangle to use from the original icon image.\n * @property {module:ol/style/IconOrigin} [offsetOrigin] Origin of the offset: `bottom-left`, `bottom-right`,\n * `top-left` or `top-right`. Default is `top-left`.\n * @property {number} [opacity=1] Opacity of the icon.\n * @property {number} [scale=1] Scale.\n * @property {boolean} [rotateWithView=false] Whether to rotate the icon with the view.\n * @property {number} [rotation=0] Rotation in radians (positive rotation clockwise).\n * @property {module:ol/size~Size} [size] Icon size in pixel. Can be used together with `offset` to define the\n * sub-rectangle to use from the origin (sprite) icon image.\n * @property {module:ol/size~Size} [imgSize] Image size in pixels. Only required if `img` is set and `src` is not, and\n * for SVG images in Internet Explorer 11. The provided `imgSize` needs to match the actual size of the image.\n * @property {string} [src] Image source URI.\n */\n\n\n/**\n * @classdesc\n * Set icon style for vector features.\n * @api\n */\nclass Icon extends ImageStyle {\n  /**\n   * @param {module:ol/style/Icon~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n    const options = opt_options || {};\n\n    /**\n     * @type {number}\n     */\n    const opacity = options.opacity !== undefined ? options.opacity : 1;\n\n    /**\n     * @type {number}\n     */\n    const rotation = options.rotation !== undefined ? options.rotation : 0;\n\n    /**\n     * @type {number}\n     */\n    const scale = options.scale !== undefined ? options.scale : 1;\n\n    /**\n     * @type {boolean}\n     */\n    const rotateWithView = options.rotateWithView !== undefined ?\n      options.rotateWithView : false;\n\n    super({\n      opacity: opacity,\n      rotation: rotation,\n      scale: scale,\n      rotateWithView: rotateWithView\n    });\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.anchor_ = options.anchor !== undefined ? options.anchor : [0.5, 0.5];\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.normalizedAnchor_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/style/IconOrigin}\n     */\n    this.anchorOrigin_ = options.anchorOrigin !== undefined ?\n      options.anchorOrigin : IconOrigin.TOP_LEFT;\n\n    /**\n     * @private\n     * @type {module:ol/style/IconAnchorUnits}\n     */\n    this.anchorXUnits_ = options.anchorXUnits !== undefined ?\n      options.anchorXUnits : IconAnchorUnits.FRACTION;\n\n    /**\n     * @private\n     * @type {module:ol/style/IconAnchorUnits}\n     */\n    this.anchorYUnits_ = options.anchorYUnits !== undefined ?\n      options.anchorYUnits : IconAnchorUnits.FRACTION;\n\n    /**\n     * @private\n     * @type {?string}\n     */\n    this.crossOrigin_ =\n        options.crossOrigin !== undefined ? options.crossOrigin : null;\n\n    /**\n     * @type {HTMLImageElement|HTMLCanvasElement}\n     */\n    const image = options.img !== undefined ? options.img : null;\n\n    /**\n     * @type {module:ol/size~Size}\n     */\n    const imgSize = options.imgSize !== undefined ? options.imgSize : null;\n\n    /**\n     * @type {string|undefined}\n     */\n    let src = options.src;\n\n    assert(!(src !== undefined && image),\n      4); // `image` and `src` cannot be provided at the same time\n    assert(!image || (image && imgSize),\n      5); // `imgSize` must be set when `image` is provided\n\n    if ((src === undefined || src.length === 0) && image) {\n      src = image.src || getUid(image).toString();\n    }\n    assert(src !== undefined && src.length > 0,\n      6); // A defined and non-empty `src` or `image` must be provided\n\n    /**\n     * @type {module:ol/ImageState}\n     */\n    const imageState = options.src !== undefined ?\n      ImageState.IDLE : ImageState.LOADED;\n\n    /**\n     * @private\n     * @type {module:ol/color~Color}\n     */\n    this.color_ = options.color !== undefined ? asArray(options.color) : null;\n\n    /**\n     * @private\n     * @type {module:ol/style/IconImage}\n     */\n    this.iconImage_ = getIconImage(\n      image, /** @type {string} */ (src), imgSize, this.crossOrigin_, imageState, this.color_);\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.offset_ = options.offset !== undefined ? options.offset : [0, 0];\n\n    /**\n     * @private\n     * @type {module:ol/style/IconOrigin}\n     */\n    this.offsetOrigin_ = options.offsetOrigin !== undefined ?\n      options.offsetOrigin : IconOrigin.TOP_LEFT;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.origin_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/size~Size}\n     */\n    this.size_ = options.size !== undefined ? options.size : null;\n\n  }\n\n  /**\n   * Clones the style. The underlying Image/HTMLCanvasElement is not cloned.\n   * @return {module:ol/style/Icon} The cloned style.\n   * @api\n   */\n  clone() {\n    return new Icon({\n      anchor: this.anchor_.slice(),\n      anchorOrigin: this.anchorOrigin_,\n      anchorXUnits: this.anchorXUnits_,\n      anchorYUnits: this.anchorYUnits_,\n      crossOrigin: this.crossOrigin_,\n      color: (this.color_ && this.color_.slice) ? this.color_.slice() : this.color_ || undefined,\n      src: this.getSrc(),\n      offset: this.offset_.slice(),\n      offsetOrigin: this.offsetOrigin_,\n      size: this.size_ !== null ? this.size_.slice() : undefined,\n      opacity: this.getOpacity(),\n      scale: this.getScale(),\n      rotation: this.getRotation(),\n      rotateWithView: this.getRotateWithView()\n    });\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getAnchor() {\n    if (this.normalizedAnchor_) {\n      return this.normalizedAnchor_;\n    }\n    let anchor = this.anchor_;\n    const size = this.getSize();\n    if (this.anchorXUnits_ == IconAnchorUnits.FRACTION ||\n        this.anchorYUnits_ == IconAnchorUnits.FRACTION) {\n      if (!size) {\n        return null;\n      }\n      anchor = this.anchor_.slice();\n      if (this.anchorXUnits_ == IconAnchorUnits.FRACTION) {\n        anchor[0] *= size[0];\n      }\n      if (this.anchorYUnits_ == IconAnchorUnits.FRACTION) {\n        anchor[1] *= size[1];\n      }\n    }\n\n    if (this.anchorOrigin_ != IconOrigin.TOP_LEFT) {\n      if (!size) {\n        return null;\n      }\n      if (anchor === this.anchor_) {\n        anchor = this.anchor_.slice();\n      }\n      if (this.anchorOrigin_ == IconOrigin.TOP_RIGHT ||\n          this.anchorOrigin_ == IconOrigin.BOTTOM_RIGHT) {\n        anchor[0] = -anchor[0] + size[0];\n      }\n      if (this.anchorOrigin_ == IconOrigin.BOTTOM_LEFT ||\n          this.anchorOrigin_ == IconOrigin.BOTTOM_RIGHT) {\n        anchor[1] = -anchor[1] + size[1];\n      }\n    }\n    this.normalizedAnchor_ = anchor;\n    return this.normalizedAnchor_;\n  }\n\n  /**\n   * Set the anchor point. The anchor determines the center point for the\n   * symbolizer.\n   *\n   * @param {Array<number>} anchor Anchor.\n   * @api\n   */\n  setAnchor(anchor) {\n    this.anchor_ = anchor;\n    this.normalizedAnchor_ = null;\n  }\n\n  /**\n   * Get the icon color.\n   * @return {module:ol/color~Color} Color.\n   * @api\n   */\n  getColor() {\n    return this.color_;\n  }\n\n  /**\n   * Get the image icon.\n   * @param {number} pixelRatio Pixel ratio.\n   * @return {HTMLImageElement|HTMLCanvasElement} Image or Canvas element.\n   * @override\n   * @api\n   */\n  getImage(pixelRatio) {\n    return this.iconImage_.getImage(pixelRatio);\n  }\n\n  /**\n   * @override\n   */\n  getImageSize() {\n    return this.iconImage_.getSize();\n  }\n\n  /**\n   * @override\n   */\n  getHitDetectionImageSize() {\n    return this.getImageSize();\n  }\n\n  /**\n   * @override\n   */\n  getImageState() {\n    return this.iconImage_.getImageState();\n  }\n\n  /**\n   * @override\n   */\n  getHitDetectionImage(pixelRatio) {\n    return this.iconImage_.getHitDetectionImage(pixelRatio);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getOrigin() {\n    if (this.origin_) {\n      return this.origin_;\n    }\n    let offset = this.offset_;\n\n    if (this.offsetOrigin_ != IconOrigin.TOP_LEFT) {\n      const size = this.getSize();\n      const iconImageSize = this.iconImage_.getSize();\n      if (!size || !iconImageSize) {\n        return null;\n      }\n      offset = offset.slice();\n      if (this.offsetOrigin_ == IconOrigin.TOP_RIGHT ||\n          this.offsetOrigin_ == IconOrigin.BOTTOM_RIGHT) {\n        offset[0] = iconImageSize[0] - size[0] - offset[0];\n      }\n      if (this.offsetOrigin_ == IconOrigin.BOTTOM_LEFT ||\n          this.offsetOrigin_ == IconOrigin.BOTTOM_RIGHT) {\n        offset[1] = iconImageSize[1] - size[1] - offset[1];\n      }\n    }\n    this.origin_ = offset;\n    return this.origin_;\n  }\n\n  /**\n   * Get the image URL.\n   * @return {string|undefined} Image src.\n   * @api\n   */\n  getSrc() {\n    return this.iconImage_.getSrc();\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getSize() {\n    return !this.size_ ? this.iconImage_.getSize() : this.size_;\n  }\n\n  /**\n   * @override\n   */\n  listenImageChange(listener, thisArg) {\n    return listen(this.iconImage_, EventType.CHANGE,\n      listener, thisArg);\n  }\n\n  /**\n   * Load not yet loaded URI.\n   * When rendering a feature with an icon style, the vector renderer will\n   * automatically call this method. However, you might want to call this\n   * method yourself for preloading or other purposes.\n   * @override\n   * @api\n   */\n  load() {\n    this.iconImage_.load();\n  }\n\n  /**\n   * @override\n   */\n  unlistenImageChange(listener, thisArg) {\n    unlisten(this.iconImage_, EventType.CHANGE,\n      listener, thisArg);\n  }\n}\n\n\nexport default Icon;\n","/**\n * @module ol/style/Text\n */\nimport Fill from '../style/Fill.js';\nimport TextPlacement from '../style/TextPlacement.js';\n\n\n/**\n * The default fill color to use if no fill was set at construction time; a\n * blackish `#333`.\n *\n * @const {string}\n */\nconst DEFAULT_FILL_COLOR = '#333';\n\n\n/**\n * @typedef {Object} Options\n * @property {string} [font] Font style as CSS 'font' value, see:\n * https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/font. Default is '10px sans-serif'\n * @property {number} [maxAngle] When `placement` is set to `'line'`, allow a maximum angle between adjacent characters.\n * The expected value is in radians, and the default is 45° (`Math.PI / 4`).\n * @property {number} [offsetX=0] Horizontal text offset in pixels. A positive will shift the text right.\n * @property {number} [offsetY=0] Vertical text offset in pixels. A positive will shift the text down.\n * @property {boolean} [overflow=false] For polygon labels or when `placement` is set to `'line'`, allow text to exceed\n * the width of the polygon at the label position or the length of the path that it follows.\n * @property {module:ol/style/TextPlacement|string} [placement] Text placement.\n * @property {number} [scale] Scale.\n * @property {boolean} [rotateWithView=false] Whether to rotate the text with the view.\n * @property {number} [rotation=0] Rotation in radians (positive rotation clockwise).\n * @property {string} [text] Text content.\n * @property {string} [textAlign] Text alignment. Possible values: 'left', 'right', 'center', 'end' or 'start'.\n * Default is 'center' for `placement: 'point'`. For `placement: 'line'`, the default is to let the renderer choose a\n * placement where `maxAngle` is not exceeded.\n * @property {string} [textBaseline='middle'] Text base line. Possible values: 'bottom', 'top', 'middle', 'alphabetic',\n * 'hanging', 'ideographic'.\n * @property {module:ol/style/Fill} [fill] Fill style. If none is provided, we'll use a dark fill-style (#333).\n * @property {module:ol/style/Stroke} [stroke] Stroke style.\n * @property {module:ol/style/Fill} [backgroundFill] Fill style for the text background when `placement` is\n * `'point'`. Default is no fill.\n * @property {module:ol/style/Stroke} [backgroundStroke] Stroke style for the text background  when `placement`\n * is `'point'`. Default is no stroke.\n * @property {Array<number>} [padding=[0, 0, 0, 0]] Padding in pixels around the text for decluttering and background. The order of\n * values in the array is `[top, right, bottom, left]`.\n */\n\n\n/**\n * @classdesc\n * Set text style for vector features.\n * @api\n */\nclass Text {\n  /**\n   * @param {module:ol/style/Text~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n\n    /**\n    * @private\n    * @type {string|undefined}\n    */\n    this.font_ = options.font;\n\n    /**\n    * @private\n    * @type {number|undefined}\n    */\n    this.rotation_ = options.rotation;\n\n    /**\n    * @private\n    * @type {boolean|undefined}\n    */\n    this.rotateWithView_ = options.rotateWithView;\n\n    /**\n    * @private\n    * @type {number|undefined}\n    */\n    this.scale_ = options.scale;\n\n    /**\n    * @private\n    * @type {string|undefined}\n    */\n    this.text_ = options.text;\n\n    /**\n    * @private\n    * @type {string|undefined}\n    */\n    this.textAlign_ = options.textAlign;\n\n    /**\n    * @private\n    * @type {string|undefined}\n    */\n    this.textBaseline_ = options.textBaseline;\n\n    /**\n    * @private\n    * @type {module:ol/style/Fill}\n    */\n    this.fill_ = options.fill !== undefined ? options.fill :\n      new Fill({color: DEFAULT_FILL_COLOR});\n\n    /**\n    * @private\n    * @type {number}\n    */\n    this.maxAngle_ = options.maxAngle !== undefined ? options.maxAngle : Math.PI / 4;\n\n    /**\n    * @private\n    * @type {module:ol/style/TextPlacement|string}\n    */\n    this.placement_ = options.placement !== undefined ? options.placement : TextPlacement.POINT;\n\n    /**\n    * @private\n    * @type {boolean}\n    */\n    this.overflow_ = !!options.overflow;\n\n    /**\n    * @private\n    * @type {module:ol/style/Stroke}\n    */\n    this.stroke_ = options.stroke !== undefined ? options.stroke : null;\n\n    /**\n    * @private\n    * @type {number}\n    */\n    this.offsetX_ = options.offsetX !== undefined ? options.offsetX : 0;\n\n    /**\n    * @private\n    * @type {number}\n    */\n    this.offsetY_ = options.offsetY !== undefined ? options.offsetY : 0;\n\n    /**\n    * @private\n    * @type {module:ol/style/Fill}\n    */\n    this.backgroundFill_ = options.backgroundFill ? options.backgroundFill : null;\n\n    /**\n    * @private\n    * @type {module:ol/style/Stroke}\n    */\n    this.backgroundStroke_ = options.backgroundStroke ? options.backgroundStroke : null;\n\n    /**\n    * @private\n    * @type {Array<number>}\n    */\n    this.padding_ = options.padding === undefined ? null : options.padding;\n  }\n\n  /**\n  * Clones the style.\n  * @return {module:ol/style/Text} The cloned style.\n  * @api\n  */\n  clone() {\n    return new Text({\n      font: this.getFont(),\n      placement: this.getPlacement(),\n      maxAngle: this.getMaxAngle(),\n      overflow: this.getOverflow(),\n      rotation: this.getRotation(),\n      rotateWithView: this.getRotateWithView(),\n      scale: this.getScale(),\n      text: this.getText(),\n      textAlign: this.getTextAlign(),\n      textBaseline: this.getTextBaseline(),\n      fill: this.getFill() ? this.getFill().clone() : undefined,\n      stroke: this.getStroke() ? this.getStroke().clone() : undefined,\n      offsetX: this.getOffsetX(),\n      offsetY: this.getOffsetY(),\n      backgroundFill: this.getBackgroundFill() ? this.getBackgroundFill().clone() : undefined,\n      backgroundStroke: this.getBackgroundStroke() ? this.getBackgroundStroke().clone() : undefined\n    });\n  }\n\n  /**\n  * Get the `overflow` configuration.\n  * @return {boolean} Let text overflow the length of the path they follow.\n  * @api\n  */\n  getOverflow() {\n    return this.overflow_;\n  }\n\n  /**\n  * Get the font name.\n  * @return {string|undefined} Font.\n  * @api\n  */\n  getFont() {\n    return this.font_;\n  }\n\n  /**\n  * Get the maximum angle between adjacent characters.\n  * @return {number} Angle in radians.\n  * @api\n  */\n  getMaxAngle() {\n    return this.maxAngle_;\n  }\n\n  /**\n  * Get the label placement.\n  * @return {module:ol/style/TextPlacement|string} Text placement.\n  * @api\n  */\n  getPlacement() {\n    return this.placement_;\n  }\n\n  /**\n  * Get the x-offset for the text.\n  * @return {number} Horizontal text offset.\n  * @api\n  */\n  getOffsetX() {\n    return this.offsetX_;\n  }\n\n  /**\n  * Get the y-offset for the text.\n  * @return {number} Vertical text offset.\n  * @api\n  */\n  getOffsetY() {\n    return this.offsetY_;\n  }\n\n  /**\n  * Get the fill style for the text.\n  * @return {module:ol/style/Fill} Fill style.\n  * @api\n  */\n  getFill() {\n    return this.fill_;\n  }\n\n  /**\n  * Determine whether the text rotates with the map.\n  * @return {boolean|undefined} Rotate with map.\n  * @api\n  */\n  getRotateWithView() {\n    return this.rotateWithView_;\n  }\n\n  /**\n  * Get the text rotation.\n  * @return {number|undefined} Rotation.\n  * @api\n  */\n  getRotation() {\n    return this.rotation_;\n  }\n\n  /**\n  * Get the text scale.\n  * @return {number|undefined} Scale.\n  * @api\n  */\n  getScale() {\n    return this.scale_;\n  }\n\n  /**\n  * Get the stroke style for the text.\n  * @return {module:ol/style/Stroke} Stroke style.\n  * @api\n  */\n  getStroke() {\n    return this.stroke_;\n  }\n\n  /**\n  * Get the text to be rendered.\n  * @return {string|undefined} Text.\n  * @api\n  */\n  getText() {\n    return this.text_;\n  }\n\n  /**\n  * Get the text alignment.\n  * @return {string|undefined} Text align.\n  * @api\n  */\n  getTextAlign() {\n    return this.textAlign_;\n  }\n\n  /**\n  * Get the text baseline.\n  * @return {string|undefined} Text baseline.\n  * @api\n  */\n  getTextBaseline() {\n    return this.textBaseline_;\n  }\n\n  /**\n  * Get the background fill style for the text.\n  * @return {module:ol/style/Fill} Fill style.\n  * @api\n  */\n  getBackgroundFill() {\n    return this.backgroundFill_;\n  }\n\n  /**\n  * Get the background stroke style for the text.\n  * @return {module:ol/style/Stroke} Stroke style.\n  * @api\n  */\n  getBackgroundStroke() {\n    return this.backgroundStroke_;\n  }\n\n  /**\n  * Get the padding for the text.\n  * @return {Array<number>} Padding.\n  * @api\n  */\n  getPadding() {\n    return this.padding_;\n  }\n\n  /**\n  * Set the `overflow` property.\n  *\n  * @param {boolean} overflow Let text overflow the path that it follows.\n  * @api\n  */\n  setOverflow(overflow) {\n    this.overflow_ = overflow;\n  }\n\n  /**\n  * Set the font.\n  *\n  * @param {string|undefined} font Font.\n  * @api\n  */\n  setFont(font) {\n    this.font_ = font;\n  }\n\n  /**\n  * Set the maximum angle between adjacent characters.\n  *\n  * @param {number} maxAngle Angle in radians.\n  * @api\n  */\n  setMaxAngle(maxAngle) {\n    this.maxAngle_ = maxAngle;\n  }\n\n  /**\n  * Set the x offset.\n  *\n  * @param {number} offsetX Horizontal text offset.\n  * @api\n  */\n  setOffsetX(offsetX) {\n    this.offsetX_ = offsetX;\n  }\n\n  /**\n  * Set the y offset.\n  *\n  * @param {number} offsetY Vertical text offset.\n  * @api\n  */\n  setOffsetY(offsetY) {\n    this.offsetY_ = offsetY;\n  }\n\n  /**\n  * Set the text placement.\n  *\n  * @param {module:ol/style/TextPlacement|string} placement Placement.\n  * @api\n  */\n  setPlacement(placement) {\n    this.placement_ = placement;\n  }\n\n  /**\n  * Set the fill.\n  *\n  * @param {module:ol/style/Fill} fill Fill style.\n  * @api\n  */\n  setFill(fill) {\n    this.fill_ = fill;\n  }\n\n  /**\n  * Set the rotation.\n  *\n  * @param {number|undefined} rotation Rotation.\n  * @api\n  */\n  setRotation(rotation) {\n    this.rotation_ = rotation;\n  }\n\n  /**\n  * Set the scale.\n  *\n  * @param {number|undefined} scale Scale.\n  * @api\n  */\n  setScale(scale) {\n    this.scale_ = scale;\n  }\n\n  /**\n  * Set the stroke.\n  *\n  * @param {module:ol/style/Stroke} stroke Stroke style.\n  * @api\n  */\n  setStroke(stroke) {\n    this.stroke_ = stroke;\n  }\n\n  /**\n  * Set the text.\n  *\n  * @param {string|undefined} text Text.\n  * @api\n  */\n  setText(text) {\n    this.text_ = text;\n  }\n\n  /**\n  * Set the text alignment.\n  *\n  * @param {string|undefined} textAlign Text align.\n  * @api\n  */\n  setTextAlign(textAlign) {\n    this.textAlign_ = textAlign;\n  }\n\n  /**\n  * Set the text baseline.\n  *\n  * @param {string|undefined} textBaseline Text baseline.\n  * @api\n  */\n  setTextBaseline(textBaseline) {\n    this.textBaseline_ = textBaseline;\n  }\n\n  /**\n  * Set the background fill.\n  *\n  * @param {module:ol/style/Fill} fill Fill style.\n  * @api\n  */\n  setBackgroundFill(fill) {\n    this.backgroundFill_ = fill;\n  }\n\n  /**\n  * Set the background stroke.\n  *\n  * @param {module:ol/style/Stroke} stroke Stroke style.\n  * @api\n  */\n  setBackgroundStroke(stroke) {\n    this.backgroundStroke_ = stroke;\n  }\n\n  /**\n  * Set the padding (`[top, right, bottom, left]`).\n  *\n  * @param {!Array<number>} padding Padding.\n  * @api\n  */\n  setPadding(padding) {\n    this.padding_ = padding;\n  }\n}\n\nexport default Text;\n","\nexport default ['type', 'source', 'source-layer', 'minzoom', 'maxzoom', 'filter', 'layout'];\n","\nimport refProperties from './util/ref_properties';\n\nfunction deref(layer, parent) {\n    const result = {};\n\n    for (const k in layer) {\n        if (k !== 'ref') {\n            result[k] = layer[k];\n        }\n    }\n\n    refProperties.forEach((k) => {\n        if (k in parent) {\n            result[k] = parent[k];\n        }\n    });\n\n    return result;\n}\n\nexport default derefLayers;\n\n/**\n * Given an array of layers, some of which may contain `ref` properties\n * whose value is the `id` of another property, return a new array where\n * such layers have been augmented with the 'type', 'source', etc. properties\n * from the parent layer, and the `ref` property has been removed.\n *\n * The input is not modified. The output may contain references to portions\n * of the input.\n *\n * @private\n * @param {Array<Layer>} layers\n * @returns {Array<Layer>}\n */\nfunction derefLayers(layers) {\n    layers = layers.slice();\n\n    const map = Object.create(null);\n    for (let i = 0; i < layers.length; i++) {\n        map[layers[i].id] = layers[i];\n    }\n\n    for (let i = 0; i < layers.length; i++) {\n        if ('ref' in layers[i]) {\n            layers[i] = deref(layers[i], map[layers[i].ref]);\n        }\n    }\n\n    return layers;\n}\n","\nimport spec from './v8.json';\nexport default spec;\n","export function deg2rad(degrees) {\n  return degrees * Math.PI / 180;\n}\n\nexport function getZoomForResolution(resolution, resolutions) {\n  let i = 0;\n  const ii = resolutions.length;\n  for (; i < ii; ++i) {\n    const candidate = resolutions[i];\n    if (candidate < resolution && i + 1 < ii) {\n      const zoomFactor = resolutions[i] / resolutions[i + 1];\n      return i + Math.log(resolutions[i] / resolution) / Math.log(zoomFactor);\n    }\n  }\n  return ii - 1;\n}\n","/*\nol-mapbox-style - Use Mapbox Style objects with OpenLayers\nCopyright 2016-present Boundless Spatial, Inc.\nLicense: https://raw.githubusercontent.com/boundlessgeo/ol-mapbox-gl-style/master/LICENSE\n*/\n\nimport Style from 'ol/style/Style';\nimport Fill from 'ol/style/Fill';\nimport Stroke from 'ol/style/Stroke';\nimport Icon from 'ol/style/Icon';\nimport Text from 'ol/style/Text';\nimport Circle from 'ol/style/Circle';\nimport Point from 'ol/geom/Point';\nimport derefLayers from '@mapbox/mapbox-gl-style-spec/deref';\nimport spec from '@mapbox/mapbox-gl-style-spec/reference/latest';\nimport {\n  expression, Color,\n  function as fn,\n  featureFilter as createFilter\n} from '@mapbox/mapbox-gl-style-spec';\nimport mb2css from 'mapbox-to-css-font';\nimport {deg2rad, getZoomForResolution} from './util';\n\nconst isFunction = fn.isFunction;\nconst convertFunction = fn.convertFunction;\nconst isExpression = expression.isExpression;\nconst createPropertyExpression = expression.createPropertyExpression;\n\nconst types = {\n  'Point': 1,\n  'MultiPoint': 1,\n  'LineString': 2,\n  'MultiLineString': 2,\n  'Polygon': 3,\n  'MultiPolygon': 3\n};\n\nconst expressionData = function(rawExpression, propertySpec) {\n  const compiledExpression = createPropertyExpression(rawExpression, propertySpec);\n  if (compiledExpression.result === 'error') {\n    throw new Error(compiledExpression.value.map(err => `${err.key}: ${err.message}`).join(', '));\n  }\n  return compiledExpression.value;\n};\n\nconst emptyObj = {};\nconst zoomObj = {zoom: 0};\nconst functionCache = {};\n\n/**\n * @private\n * @param {Object} layer Gl object layer.\n * @param {string} layoutOrPaint 'layout' or 'paint'.\n * @param {string} property Feature property.\n * @param {number} zoom Zoom.\n * @param {Object} feature Gl feature.\n * @return {?} Value.\n */\nexport function getValue(layer, layoutOrPaint, property, zoom, feature) {\n  const layerId = layer.id;\n  if (!functionCache[layerId]) {\n    functionCache[layerId] = {};\n  }\n  const functions = functionCache[layerId];\n  if (!functions[property]) {\n    let value = (layer[layoutOrPaint] || emptyObj)[property];\n    const propertySpec = spec[`${layoutOrPaint}_${layer.type}`][property];\n    if (value === undefined) {\n      value = propertySpec.default;\n    }\n    let isExpr = isExpression((value));\n    if (!isExpr && isFunction(value)) {\n      value = convertFunction(value, propertySpec);\n      isExpr = true;\n    }\n    if (isExpr) {\n      const compiledExpression = expressionData(value, propertySpec);\n      functions[property] = compiledExpression.evaluate.bind(compiledExpression);\n    } else {\n      if (propertySpec.type == 'color') {\n        value = Color.parse(value);\n      }\n      functions[property] = function() {\n        return value;\n      };\n    }\n  }\n  zoomObj.zoom = zoom;\n  return functions[property](zoomObj, feature);\n}\n\nconst filterCache = {};\nfunction evaluateFilter(layerId, filter, feature, zoom) {\n  if (!(layerId in filterCache)) {\n    filterCache[layerId] = createFilter(filter);\n  }\n  zoomObj.zoom = zoom;\n  return filterCache[layerId](zoomObj, feature);\n}\n\nconst colorCache = {};\nfunction colorWithOpacity(color, opacity) {\n  if (color && opacity !== undefined) {\n    let colorData = colorCache[color];\n    if (!colorData) {\n      colorCache[color] = colorData = {\n        color: color.toArray(),\n        opacity: color.a\n      };\n    }\n    color = colorData.color;\n    color[3] = colorData.opacity * opacity;\n    if (color[3] === 0) {\n      color = undefined;\n    }\n  }\n  return color;\n}\n\nconst templateRegEx = /^([^]*)\\{(.*)\\}([^]*)$/;\nfunction fromTemplate(text, properties) {\n  let parts;\n  do {\n    parts = text.match(templateRegEx);\n    if (parts) {\n      const value = properties[parts[2]] || '';\n      text = parts[1] + value + parts[3];\n    }\n  } while (parts);\n  return text;\n}\n\n/**\n * ```js\n * import stylefunction from 'ol-mapbox-style/stylefunction';\n * ```\n * Creates a style function from the `glStyle` object for all layers that use\n * the specified `source`, which needs to be a `\"type\": \"vector\"` or\n * `\"type\": \"geojson\"` source and applies it to the specified OpenLayers layer.\n *\n * Two additional properties will be set on the provided layer:\n *\n *  * `mapbox-source`: The `id` of the Mapbox Style document's source that the\n *    OpenLayers layer was created from. Usually `apply()` creates one\n *    OpenLayers layer per Mapbox Style source, unless the layer stack has\n *    layers from different sources in between.\n *  * `mapbox-layers`: The `id`s of the Mapbox Style document's layers that are\n *    included in the OpenLayers layer.\n *\n * @param {ol.layer.Vector|ol.layer.VectorTile} olLayer OpenLayers layer to\n * apply the style to. In addition to the style, the layer will get two\n * properties: `mapbox-source` will be the `id` of the `glStyle`'s source used\n * for the layer, and `mapbox-layers` will be an array of the `id`s of the\n * `glStyle`'s layers.\n * @param {string|Object} glStyle Mapbox Style object.\n * @param {string|Array<string>} source `source` key or an array of layer `id`s\n * from the Mapbox Style object. When a `source` key is provided, all layers for\n * the specified source will be included in the style function. When layer `id`s\n * are provided, they must be from layers that use the same source.\n * @param {Array<number>} [resolutions=[78271.51696402048, 39135.75848201024,\n * 19567.87924100512, 9783.93962050256, 4891.96981025128, 2445.98490512564,\n * 1222.99245256282, 611.49622628141, 305.748113140705, 152.8740565703525,\n * 76.43702828517625, 38.21851414258813, 19.109257071294063, 9.554628535647032,\n * 4.777314267823516, 2.388657133911758, 1.194328566955879, 0.5971642834779395,\n * 0.29858214173896974, 0.14929107086948487, 0.07464553543474244]]\n * Resolutions for mapping resolution to zoom level.\n * @param {Object} [spriteData=undefined] Sprite data from the url specified in\n * the Mapbox Style object's `sprite` property. Only required if a `sprite`\n * property is specified in the Mapbox Style object.\n * @param {Object} [spriteImageUrl=undefined] Sprite image url for the sprite\n * specified in the Mapbox Style object's `sprite` property. Only required if a\n * `sprite` property is specified in the Mapbox Style object.\n * @param {function(Array<string>):string} [getFonts=undefined] Function that\n * receives a font stack as arguments, and returns a (modified) font stack that\n * is available. Font names are the names used in the Mapbox Style object. If\n * not provided, the font stack will be used as-is. This function can also be\n * used for loading web fonts.\n * @return {ol.style.StyleFunction} Style function for use in\n * `ol.layer.Vector` or `ol.layer.VectorTile`.\n */\nexport default function(olLayer, glStyle, source, resolutions, spriteData, spriteImageUrl, getFonts) {\n  if (!resolutions) {\n    resolutions = [];\n    for (let res = 78271.51696402048; resolutions.length < 21; res /= 2) {\n      resolutions.push(res);\n    }\n  }\n  if (typeof glStyle == 'string') {\n    glStyle = JSON.parse(glStyle);\n  }\n  if (glStyle.version != 8) {\n    throw new Error('glStyle version 8 required.');\n  }\n\n  let spriteImage, spriteImgSize;\n  if (spriteImageUrl) {\n    const img = new Image();\n    img.crossOrigin = 'anonymous';\n    img.onload = function() {\n      spriteImage = img;\n      spriteImgSize = [img.width, img.height];\n      olLayer.changed();\n      img.onload = null;\n    };\n    img.src = spriteImageUrl;\n  }\n\n  const ctx = document.createElement('CANVAS').getContext('2d');\n  const measureCache = {};\n  function wrapText(text, font, em) {\n    const key = em + ',' + font + ',' + text;\n    let wrappedText = measureCache[key];\n    if (!wrappedText) {\n      ctx.font = font;\n      const oneEm = ctx.measureText('M').width;\n      const width = oneEm * em;\n      const words = text.split(' ');\n      let line = '';\n      const lines = [];\n      for (let i = 0, ii = words.length; i < ii; ++i) {\n        const word = words[i];\n        if ((ctx.measureText(line + word).width <= width)) {\n          line += (line ? ' ' : '') + word;\n        } else {\n          if (line) {\n            lines.push(line);\n          }\n          line = word;\n        }\n      }\n      if (line) {\n        lines.push(line);\n      }\n      measureCache[key] = wrappedText = lines.join('\\n');\n    }\n    return wrappedText;\n  }\n\n  const allLayers = derefLayers(glStyle.layers);\n\n  const layersBySourceLayer = {};\n  const mapboxLayers = [];\n  let mapboxSource;\n  for (let i = 0, ii = allLayers.length; i < ii; ++i) {\n    const layer = allLayers[i];\n    const layerId = layer.id;\n    if (typeof source == 'string' && layer.source == source ||\n        source.indexOf(layerId) !== -1) {\n      const sourceLayer = layer['source-layer'];\n      if (!mapboxSource) {\n        mapboxSource = layer.source;\n        const source = glStyle.sources[mapboxSource];\n        if (!source) {\n          throw new Error(`Source \"${mapboxSource}\" is not defined`);\n        }\n        const type = source.type;\n        if (type !== 'vector' && type !== 'geojson') {\n          throw new Error(`Source \"${mapboxSource}\" is not of type \"vector\" or \"geojson\", but \"${type}\"`);\n        }\n      }\n      let layers = layersBySourceLayer[sourceLayer];\n      if (!layers) {\n        layers = layersBySourceLayer[sourceLayer] = [];\n      }\n      layers.push({\n        layer: layer,\n        index: i\n      });\n      mapboxLayers.push(layerId);\n    }\n    // TODO revisit when diffing gets added\n    delete functionCache[layerId];\n    delete filterCache[layerId];\n  }\n\n  const textHalo = new Stroke();\n  const textColor = new Fill();\n\n  const iconImageCache = {};\n  const patternCache = {};\n  const styles = [];\n\n  const styleFunction = function(feature, resolution) {\n    const properties = feature.getProperties();\n    const layers = layersBySourceLayer[properties.layer];\n    if (!layers) {\n      return;\n    }\n    let zoom = resolutions.indexOf(resolution);\n    if (zoom == -1) {\n      zoom = getZoomForResolution(resolution, resolutions);\n    }\n    const type = types[feature.getGeometry().getType()];\n    const f = {\n      properties: properties,\n      type: type\n    };\n    let stylesLength = -1;\n    for (let i = 0, ii = layers.length; i < ii; ++i) {\n      const layerData = layers[i];\n      const layer = layerData.layer;\n      const layerId = layer.id;\n\n      const layout = layer.layout || emptyObj;\n      const paint = layer.paint || emptyObj;\n      if (layout.visibility === 'none' || ('minzoom' in layer && zoom < layer.minzoom) ||\n          ('maxzoom' in layer && zoom >= layer.maxzoom)) {\n        continue;\n      }\n      const filter = layer.filter;\n      if (!filter || evaluateFilter(layerId, filter, f, zoom)) {\n        let color, opacity, fill, stroke, strokeColor, style;\n        const index = layerData.index;\n        if (type == 3 && layer.type == 'fill') {\n          opacity = getValue(layer, 'paint', 'fill-opacity', zoom, f);\n          if ('fill-pattern' in paint) {\n            const fillIcon = getValue(layer, 'paint', 'fill-pattern', zoom, f);\n            if (fillIcon) {\n              const icon = fromTemplate(fillIcon, properties);\n              if (spriteImage && spriteData && spriteData[icon]) {\n                ++stylesLength;\n                style = styles[stylesLength];\n                if (!style || !style.getFill() || style.getStroke() || style.getText()) {\n                  style = styles[stylesLength] = new Style({\n                    fill: new Fill()\n                  });\n                }\n                fill = style.getFill();\n                style.setZIndex(index);\n                const icon_cache_key = icon + '.' + opacity;\n                let pattern = patternCache[icon_cache_key];\n                if (!pattern) {\n                  const spriteImageData = spriteData[icon];\n                  const canvas = document.createElement('canvas');\n                  canvas.width = spriteImageData.width;\n                  canvas.height = spriteImageData.height;\n                  const ctx = canvas.getContext('2d');\n                  ctx.globalAlpha = opacity;\n                  ctx.drawImage(\n                    spriteImage,\n                    spriteImageData.x,\n                    spriteImageData.y,\n                    spriteImageData.width,\n                    spriteImageData.height,\n                    0,\n                    0,\n                    spriteImageData.width,\n                    spriteImageData.height\n                  );\n                  pattern = ctx.createPattern(canvas, 'repeat');\n                  patternCache[icon_cache_key] = pattern;\n                }\n                fill.setColor(pattern);\n              }\n            }\n          } else {\n            color = colorWithOpacity(getValue(layer, 'paint', 'fill-color', zoom, f), opacity);\n            if (color) {\n              ++stylesLength;\n              style = styles[stylesLength];\n              if (!style || !style.getFill() || style.getStroke() || style.getText()) {\n                style = styles[stylesLength] = new Style({\n                  fill: new Fill()\n                });\n              }\n              fill = style.getFill();\n              fill.setColor(color);\n              style.setZIndex(index);\n            }\n            if ('fill-outline-color' in paint) {\n              strokeColor = colorWithOpacity(getValue(layer, 'paint', 'fill-outline-color', zoom, f), opacity);\n            }\n            if (strokeColor) {\n              ++stylesLength;\n              style = styles[stylesLength];\n              if (!style || !style.getStroke() || style.getFill() || style.getText()) {\n                style = styles[stylesLength] = new Style({\n                  stroke: new Stroke()\n                });\n              }\n              stroke = style.getStroke();\n              stroke.setLineCap(spec['layout_line']['line-cap']);\n              stroke.setLineJoin(spec['layout_line']['line-join']);\n              stroke.setMiterLimit(spec['layout_line']['line-miter-limit']);\n              stroke.setColor(strokeColor);\n              stroke.setWidth(1);\n              stroke.setLineDash(null);\n              style.setZIndex(index);\n            }\n          }\n        }\n        if (type != 1 && layer.type == 'line') {\n          color = !('line-pattern' in paint) && 'line-color' in paint ?\n            colorWithOpacity(getValue(layer, 'paint', 'line-color', zoom, f), getValue(layer, 'paint', 'line-opacity', zoom, f)) :\n            undefined;\n          const width = getValue(layer, 'paint', 'line-width', zoom, f);\n          if (color && width > 0) {\n            ++stylesLength;\n            style = styles[stylesLength];\n            if (!style || !style.getStroke() || style.getFill() || style.getText()) {\n              style = styles[stylesLength] = new Style({\n                stroke: new Stroke()\n              });\n            }\n            stroke = style.getStroke();\n            stroke.setLineCap(getValue(layer, 'layout', 'line-cap', zoom, f));\n            stroke.setLineJoin(getValue(layer, 'layout', 'line-join', zoom, f));\n            stroke.setMiterLimit(getValue(layer, 'layout', 'line-miter-limit', zoom, f));\n            stroke.setColor(color);\n            stroke.setWidth(width);\n            stroke.setLineDash(paint['line-dasharray'] ?\n              getValue(layer, 'paint', 'line-dasharray', zoom, f).map(function(x) {\n                return x * width;\n              }) : null);\n            style.setZIndex(index);\n          }\n        }\n\n        let hasImage = false;\n        let text = null;\n        let placementAngle = 0;\n        let icon, iconImg, skipLabel;\n        if ((type == 1 || type == 2) && 'icon-image' in layout) {\n          const iconImage = getValue(layer, 'layout', 'icon-image', zoom, f);\n          if (iconImage) {\n            icon = fromTemplate(iconImage, properties);\n            let styleGeom = undefined;\n            if (spriteImage && spriteData && spriteData[icon]) {\n              if (type == 2) {\n                const geom = feature.getGeometry();\n                // ol package and ol-debug.js only\n                if (geom.getFlatMidpoint) {\n                  const extent = geom.getExtent();\n                  const size = Math.sqrt(Math.max(\n                    Math.pow((extent[2] - extent[0]) / resolution, 2),\n                    Math.pow((extent[3] - extent[1]) / resolution, 2))\n                  );\n                  if (size > 150) {\n                    //FIXME Do not hard-code a size of 150\n                    const midpoint = geom.getFlatMidpoint();\n                    styleGeom = new Point(midpoint);\n                    const placement = getValue(layer, 'layout', 'symbol-placement');\n                    if (placement === 'line') {\n                      const stride = geom.getStride();\n                      const coordinates = geom.getFlatCoordinates();\n                      for (let i = 0, ii = coordinates.length - stride; i < ii; i += stride) {\n                        const x1 = coordinates[i];\n                        const y1 = coordinates[i + 1];\n                        const x2 = coordinates[i + stride];\n                        const y2 = coordinates[i + stride + 1];\n                        const minX = Math.min(x1, x2);\n                        const minY = Math.min(y1, y2);\n                        const maxX = Math.max(x1, x2);\n                        const maxY = Math.max(y1, y2);\n                        if (midpoint[0] >= minX && midpoint[0] <= maxX &&\n                            midpoint[1] >= minY && midpoint[1] <= maxY) {\n                          placementAngle = Math.atan2(y1 - y2, x2 - x1);\n                          break;\n                        }\n                      }\n                    }\n                  }\n                }\n              }\n              if (type !== 2 || styleGeom) {\n                ++stylesLength;\n                style = styles[stylesLength];\n                if (!style || !style.getImage() || style.getFill() || style.getStroke()) {\n                  style = styles[stylesLength] = new Style();\n                }\n                style.setGeometry(styleGeom);\n                const iconSize = getValue(layer, 'layout', 'icon-size', zoom, f);\n                const iconColor = paint['icon-color'] !== undefined ? getValue(layer, 'paint', 'icon-color', zoom, f) : null;\n                let icon_cache_key = icon + '.' + iconSize;\n                if (iconColor !== null) {\n                  icon_cache_key += '.' + iconColor;\n                }\n                iconImg = iconImageCache[icon_cache_key];\n                if (!iconImg) {\n                  const spriteImageData = spriteData[icon];\n                  if (iconColor !== null) {\n                    // cut out the sprite and color it\n                    color = colorWithOpacity(iconColor, 1);\n                    const canvas = document.createElement('canvas');\n                    canvas.width = spriteImageData.width;\n                    canvas.height = spriteImageData.height;\n                    const ctx = canvas.getContext('2d');\n                    ctx.drawImage(\n                      spriteImage,\n                      spriteImageData.x,\n                      spriteImageData.y,\n                      spriteImageData.width,\n                      spriteImageData.height,\n                      0,\n                      0,\n                      spriteImageData.width,\n                      spriteImageData.height\n                    );\n                    const data = ctx.getImageData(0, 0, canvas.width, canvas.height);\n                    for (let c = 0, cc = data.data.length; c < cc; c += 4) {\n                      data.data[c] = color[0];\n                      data.data[c + 1] = color[1];\n                      data.data[c + 2] = color[2];\n                    }\n                    ctx.putImageData(data, 0, 0);\n                    iconImg = iconImageCache[icon_cache_key] = new Icon({\n                      img: canvas,\n                      imgSize: [canvas.width, canvas.height],\n                      scale: iconSize / spriteImageData.pixelRatio\n                    });\n                  } else {\n                    iconImg = iconImageCache[icon_cache_key] = new Icon({\n                      img: spriteImage,\n                      imgSize: spriteImgSize,\n                      size: [spriteImageData.width, spriteImageData.height],\n                      offset: [spriteImageData.x, spriteImageData.y],\n                      rotateWithView: getValue(layer, 'layout', 'icon-rotation-alignment') === 'map',\n                      scale: iconSize / spriteImageData.pixelRatio\n                    });\n                  }\n                }\n                iconImg.setRotation(placementAngle + deg2rad(getValue(layer, 'layout', 'icon-rotate', zoom, f)));\n                iconImg.setOpacity(getValue(layer, 'paint', 'icon-opacity', zoom, f));\n                style.setImage(iconImg);\n                text = style.getText();\n                style.setText(undefined);\n                style.setZIndex(99999 - index);\n                hasImage = true;\n                skipLabel = false;\n              } else {\n                skipLabel = true;\n              }\n            }\n          }\n        }\n\n        if (type == 1 && 'circle-radius' in paint) {\n          ++stylesLength;\n          style = styles[stylesLength];\n          if (!style || !style.getImage() || style.getFill() || style.getStroke()) {\n            style = styles[stylesLength] = new Style();\n          }\n          const circleRadius = getValue(layer, 'paint', 'circle-radius', zoom, f);\n          const circleStrokeColor = getValue(layer, 'paint', 'circle-stroke-color', zoom, f);\n          const circleColor = getValue(layer, 'paint', 'circle-color', zoom, f);\n          const circleOpacity = getValue(layer, 'paint', 'circle-opacity', zoom, f);\n          const circleStrokeOpacity = getValue(layer, 'paint', 'circle-stroke-opacity', zoom, f);\n          const circleStrokeWidth = getValue(layer, 'paint', 'circle-stroke-width', zoom, f);\n          const cache_key = circleRadius + '.' + circleStrokeColor + '.' +\n            circleColor + '.' + circleOpacity + '.' + circleStrokeWidth;\n          iconImg = iconImageCache[cache_key];\n          if (!iconImg) {\n            iconImg = new Circle({\n              radius: circleRadius,\n              stroke: circleStrokeWidth === 0 ? undefined : new Stroke({\n                width: circleStrokeWidth,\n                color: colorWithOpacity(circleStrokeColor, circleStrokeOpacity)\n              }),\n              fill: new Fill({\n                color: colorWithOpacity(circleColor, circleOpacity)\n              })\n            });\n          }\n          style.setImage(iconImg);\n          text = style.getText();\n          style.setText(undefined);\n          style.setGeometry(undefined);\n          style.setZIndex(99999 - index);\n          hasImage = true;\n        }\n\n        let label;\n        if ('text-field' in layout) {\n          const textField = getValue(layer, 'layout', 'text-field', zoom, f).toString();\n          label = fromTemplate(textField, properties);\n        }\n        if (label && !skipLabel) {\n          if (!hasImage) {\n            ++stylesLength;\n            style = styles[stylesLength];\n            if (!style || !style.getText() || style.getFill() || style.getStroke()) {\n              style = styles[stylesLength] = new Style();\n            }\n            style.setImage(undefined);\n            style.setGeometry(undefined);\n          }\n          if (!style.getText()) {\n            style.setText(text || new Text());\n          }\n          text = style.getText();\n          const textSize = getValue(layer, 'layout', 'text-size', zoom, f);\n          const fontArray = getValue(layer, 'layout', 'text-font', zoom, f);\n          const font = mb2css(getFonts ? getFonts(fontArray) : fontArray, textSize);\n          const textTransform = layout['text-transform'];\n          if (textTransform == 'uppercase') {\n            label = label.toUpperCase();\n          } else if (textTransform == 'lowercase') {\n            label = label.toLowerCase();\n          }\n          const wrappedLabel = type == 2 ? label : wrapText(label, font, getValue(layer, 'layout', 'text-max-width', zoom, f));\n          text.setText(wrappedLabel);\n          text.setFont(font);\n          text.setRotation(deg2rad(getValue(layer, 'layout', 'text-rotate', zoom, f)));\n          const textAnchor = getValue(layer, 'layout', 'text-anchor', zoom, f);\n          const placement = (hasImage || type == 1) ? 'point' : getValue(layer, 'layout', 'symbol-placement', zoom, f);\n          text.setPlacement(placement);\n          if (placement == 'point') {\n            let textAlign = 'center';\n            if (textAnchor.indexOf('left') !== -1) {\n              textAlign = 'left';\n            } else if (textAnchor.indexOf('right') !== -1) {\n              textAlign = 'right';\n            }\n            text.setTextAlign(textAlign);\n          } else {\n            text.setTextAlign();\n          }\n          let textBaseline = 'middle';\n          if (textAnchor.indexOf('bottom') == 0) {\n            textBaseline = 'bottom';\n          } else if (textAnchor.indexOf('top') == 0) {\n            textBaseline = 'top';\n          }\n          text.setTextBaseline(textBaseline);\n          const textOffset = getValue(layer, 'layout', 'text-offset', zoom, f);\n          text.setOffsetX(textOffset[0] * textSize);\n          text.setOffsetY(textOffset[1] * textSize);\n          opacity = getValue(layer, 'paint', 'text-opacity', zoom, f);\n          textColor.setColor(colorWithOpacity(getValue(layer, 'paint', 'text-color', zoom, f), opacity));\n          text.setFill(textColor);\n          const haloColor = colorWithOpacity(getValue(layer, 'paint', 'text-halo-color', zoom, f), opacity);\n          if (haloColor) {\n            textHalo.setColor(haloColor);\n            textHalo.setWidth(getValue(layer, 'paint', 'text-halo-width', zoom, f));\n            text.setStroke(textHalo);\n          } else {\n            text.setStroke(undefined);\n          }\n          style.setZIndex(99999 - index);\n        }\n      }\n    }\n\n    if (stylesLength > -1) {\n      styles.length = stylesLength + 1;\n      return styles;\n    }\n  };\n\n  olLayer.setStyle(styleFunction);\n  olLayer.set('mapbox-source', mapboxSource);\n  olLayer.set('mapbox-layers', mapboxLayers);\n  return styleFunction;\n}\n","/**\n * @license\n * Latitude/longitude spherical geodesy formulae taken from\n * http://www.movable-type.co.uk/scripts/latlong.html\n * Licensed under CC-BY-3.0.\n */\n\n/**\n * @module ol/sphere\n */\nimport {toRadians, toDegrees} from './math.js';\nimport GeometryType from './geom/GeometryType.js';\n\n\n/**\n * Object literal with options for the {@link getLength} or {@link getArea}\n * functions.\n * @typedef {Object} SphereMetricOptions\n * @property {module:ol/proj~ProjectionLike} [projection='EPSG:3857']\n * Projection of the  geometry.  By default, the geometry is assumed to be in\n * Web Mercator.\n * @property {number} [radius=6371008.8] Sphere radius.  By default, the radius of the\n * earth is used (Clarke 1866 Authalic Sphere).\n */\n\n\n/**\n * The mean Earth radius (1/3 * (2a + b)) for the WGS84 ellipsoid.\n * https://en.wikipedia.org/wiki/Earth_radius#Mean_radius\n * @type {number}\n */\nexport const DEFAULT_RADIUS = 6371008.8;\n\n\n/**\n * Get the great circle distance (in meters) between two geographic coordinates.\n * @param {Array} c1 Starting coordinate.\n * @param {Array} c2 Ending coordinate.\n * @param {number=} opt_radius The sphere radius to use.  Defaults to the Earth's\n *     mean radius using the WGS84 ellipsoid.\n * @return {number} The great circle distance between the points (in meters).\n * @api\n */\nexport function getDistance(c1, c2, opt_radius) {\n  const radius = opt_radius || DEFAULT_RADIUS;\n  const lat1 = toRadians(c1[1]);\n  const lat2 = toRadians(c2[1]);\n  const deltaLatBy2 = (lat2 - lat1) / 2;\n  const deltaLonBy2 = toRadians(c2[0] - c1[0]) / 2;\n  const a = Math.sin(deltaLatBy2) * Math.sin(deltaLatBy2) +\n      Math.sin(deltaLonBy2) * Math.sin(deltaLonBy2) *\n      Math.cos(lat1) * Math.cos(lat2);\n  return 2 * radius * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));\n}\n\n\n/**\n * Get the cumulative great circle length of linestring coordinates (geographic).\n * @param {Array} coordinates Linestring coordinates.\n * @param {number} radius The sphere radius to use.\n * @return {number} The length (in meters).\n */\nfunction getLengthInternal(coordinates, radius) {\n  let length = 0;\n  for (let i = 0, ii = coordinates.length; i < ii - 1; ++i) {\n    length += getDistance(coordinates[i], coordinates[i + 1], radius);\n  }\n  return length;\n}\n\n\n/**\n * Get the spherical length of a geometry.  This length is the sum of the\n * great circle distances between coordinates.  For polygons, the length is\n * the sum of all rings.  For points, the length is zero.  For multi-part\n * geometries, the length is the sum of the length of each part.\n * @param {module:ol/geom/Geometry} geometry A geometry.\n * @param {module:ol/sphere~SphereMetricOptions=} opt_options Options for the\n * length calculation.  By default, geometries are assumed to be in 'EPSG:3857'.\n * You can change this by providing a `projection` option.\n * @return {number} The spherical length (in meters).\n * @api\n */\nexport function getLength(geometry, opt_options) {\n  const options = opt_options || {};\n  const radius = options.radius || DEFAULT_RADIUS;\n  const projection = options.projection || 'EPSG:3857';\n  const type = geometry.getType();\n  if (type !== GeometryType.GEOMETRY_COLLECTION) {\n    geometry = geometry.clone().transform(projection, 'EPSG:4326');\n  }\n  let length = 0;\n  let coordinates, coords, i, ii, j, jj;\n  switch (type) {\n    case GeometryType.POINT:\n    case GeometryType.MULTI_POINT: {\n      break;\n    }\n    case GeometryType.LINE_STRING:\n    case GeometryType.LINEAR_RING: {\n      coordinates = /** @type {module:ol/geom/SimpleGeometry} */ (geometry).getCoordinates();\n      length = getLengthInternal(coordinates, radius);\n      break;\n    }\n    case GeometryType.MULTI_LINE_STRING:\n    case GeometryType.POLYGON: {\n      coordinates = /** @type {module:ol/geom/SimpleGeometry} */ (geometry).getCoordinates();\n      for (i = 0, ii = coordinates.length; i < ii; ++i) {\n        length += getLengthInternal(coordinates[i], radius);\n      }\n      break;\n    }\n    case GeometryType.MULTI_POLYGON: {\n      coordinates = /** @type {module:ol/geom/SimpleGeometry} */ (geometry).getCoordinates();\n      for (i = 0, ii = coordinates.length; i < ii; ++i) {\n        coords = coordinates[i];\n        for (j = 0, jj = coords.length; j < jj; ++j) {\n          length += getLengthInternal(coords[j], radius);\n        }\n      }\n      break;\n    }\n    case GeometryType.GEOMETRY_COLLECTION: {\n      const geometries = /** @type {module:ol/geom/GeometryCollection} */ (geometry).getGeometries();\n      for (i = 0, ii = geometries.length; i < ii; ++i) {\n        length += getLength(geometries[i], opt_options);\n      }\n      break;\n    }\n    default: {\n      throw new Error('Unsupported geometry type: ' + type);\n    }\n  }\n  return length;\n}\n\n\n/**\n * Returns the spherical area for a list of coordinates.\n *\n * [Reference](https://trs-new.jpl.nasa.gov/handle/2014/40409)\n * Robert. G. Chamberlain and William H. Duquette, \"Some Algorithms for\n * Polygons on a Sphere\", JPL Publication 07-03, Jet Propulsion\n * Laboratory, Pasadena, CA, June 2007\n *\n * @param {Array<module:ol/coordinate~Coordinate>} coordinates List of coordinates of a linear\n * ring. If the ring is oriented clockwise, the area will be positive,\n * otherwise it will be negative.\n * @param {number} radius The sphere radius.\n * @return {number} Area (in square meters).\n */\nfunction getAreaInternal(coordinates, radius) {\n  let area = 0;\n  const len = coordinates.length;\n  let x1 = coordinates[len - 1][0];\n  let y1 = coordinates[len - 1][1];\n  for (let i = 0; i < len; i++) {\n    const x2 = coordinates[i][0];\n    const y2 = coordinates[i][1];\n    area += toRadians(x2 - x1) *\n        (2 + Math.sin(toRadians(y1)) +\n        Math.sin(toRadians(y2)));\n    x1 = x2;\n    y1 = y2;\n  }\n  return area * radius * radius / 2.0;\n}\n\n\n/**\n * Get the spherical area of a geometry.  This is the area (in meters) assuming\n * that polygon edges are segments of great circles on a sphere.\n * @param {module:ol/geom/Geometry} geometry A geometry.\n * @param {module:ol/sphere~SphereMetricOptions=} opt_options Options for the area\n *     calculation.  By default, geometries are assumed to be in 'EPSG:3857'.\n *     You can change this by providing a `projection` option.\n * @return {number} The spherical area (in square meters).\n * @api\n */\nexport function getArea(geometry, opt_options) {\n  const options = opt_options || {};\n  const radius = options.radius || DEFAULT_RADIUS;\n  const projection = options.projection || 'EPSG:3857';\n  const type = geometry.getType();\n  if (type !== GeometryType.GEOMETRY_COLLECTION) {\n    geometry = geometry.clone().transform(projection, 'EPSG:4326');\n  }\n  let area = 0;\n  let coordinates, coords, i, ii, j, jj;\n  switch (type) {\n    case GeometryType.POINT:\n    case GeometryType.MULTI_POINT:\n    case GeometryType.LINE_STRING:\n    case GeometryType.MULTI_LINE_STRING:\n    case GeometryType.LINEAR_RING: {\n      break;\n    }\n    case GeometryType.POLYGON: {\n      coordinates = /** @type {module:ol/geom/Polygon} */ (geometry).getCoordinates();\n      area = Math.abs(getAreaInternal(coordinates[0], radius));\n      for (i = 1, ii = coordinates.length; i < ii; ++i) {\n        area -= Math.abs(getAreaInternal(coordinates[i], radius));\n      }\n      break;\n    }\n    case GeometryType.MULTI_POLYGON: {\n      coordinates = /** @type {module:ol/geom/SimpleGeometry} */ (geometry).getCoordinates();\n      for (i = 0, ii = coordinates.length; i < ii; ++i) {\n        coords = coordinates[i];\n        area += Math.abs(getAreaInternal(coords[0], radius));\n        for (j = 1, jj = coords.length; j < jj; ++j) {\n          area -= Math.abs(getAreaInternal(coords[j], radius));\n        }\n      }\n      break;\n    }\n    case GeometryType.GEOMETRY_COLLECTION: {\n      const geometries = /** @type {module:ol/geom/GeometryCollection} */ (geometry).getGeometries();\n      for (i = 0, ii = geometries.length; i < ii; ++i) {\n        area += getArea(geometries[i], opt_options);\n      }\n      break;\n    }\n    default: {\n      throw new Error('Unsupported geometry type: ' + type);\n    }\n  }\n  return area;\n}\n\n\n/**\n * Returns the coordinate at the given distance and bearing from `c1`.\n *\n * @param {module:ol/coordinate~Coordinate} c1 The origin point (`[lon, lat]` in degrees).\n * @param {number} distance The great-circle distance between the origin\n *     point and the target point.\n * @param {number} bearing The bearing (in radians).\n * @param {number=} opt_radius The sphere radius to use.  Defaults to the Earth's\n *     mean radius using the WGS84 ellipsoid.\n * @return {module:ol/coordinate~Coordinate} The target point.\n */\nexport function offset(c1, distance, bearing, opt_radius) {\n  const radius = opt_radius || DEFAULT_RADIUS;\n  const lat1 = toRadians(c1[1]);\n  const lon1 = toRadians(c1[0]);\n  const dByR = distance / radius;\n  const lat = Math.asin(\n    Math.sin(lat1) * Math.cos(dByR) +\n      Math.cos(lat1) * Math.sin(dByR) * Math.cos(bearing));\n  const lon = lon1 + Math.atan2(\n    Math.sin(bearing) * Math.sin(dByR) * Math.cos(lat1),\n    Math.cos(dByR) - Math.sin(lat1) * Math.sin(lat));\n  return [toDegrees(lon), toDegrees(lat)];\n}\n","/**\n * @module ol/style/IconImageCache\n */\nimport {asString} from '../color.js';\n\n/**\n * @classdesc\n * Singleton class. Available through {@link module:ol/style/IconImageCache~shared}.\n */\nclass IconImageCache {\n  constructor() {\n\n    /**\n    * @type {!Object<string, module:ol/style/IconImage>}\n    * @private\n    */\n    this.cache_ = {};\n\n    /**\n    * @type {number}\n    * @private\n    */\n    this.cacheSize_ = 0;\n\n    /**\n    * @type {number}\n    * @private\n    */\n    this.maxCacheSize_ = 32;\n  }\n\n  /**\n  * FIXME empty description for jsdoc\n  */\n  clear() {\n    this.cache_ = {};\n    this.cacheSize_ = 0;\n  }\n\n  /**\n  * FIXME empty description for jsdoc\n  */\n  expire() {\n    if (this.cacheSize_ > this.maxCacheSize_) {\n      let i = 0;\n      for (const key in this.cache_) {\n        const iconImage = this.cache_[key];\n        if ((i++ & 3) === 0 && !iconImage.hasListener()) {\n          delete this.cache_[key];\n          --this.cacheSize_;\n        }\n      }\n    }\n  }\n\n  /**\n  * @param {string} src Src.\n  * @param {?string} crossOrigin Cross origin.\n  * @param {module:ol/color~Color} color Color.\n  * @return {module:ol/style/IconImage} Icon image.\n  */\n  get(src, crossOrigin, color) {\n    const key = getKey(src, crossOrigin, color);\n    return key in this.cache_ ? this.cache_[key] : null;\n  }\n\n  /**\n  * @param {string} src Src.\n  * @param {?string} crossOrigin Cross origin.\n  * @param {module:ol/color~Color} color Color.\n  * @param {module:ol/style/IconImage} iconImage Icon image.\n  */\n  set(src, crossOrigin, color, iconImage) {\n    const key = getKey(src, crossOrigin, color);\n    this.cache_[key] = iconImage;\n    ++this.cacheSize_;\n  }\n\n  /**\n  * Set the cache size of the icon cache. Default is `32`. Change this value when\n  * your map uses more than 32 different icon images and you are not caching icon\n  * styles on the application level.\n  * @param {number} maxCacheSize Cache max size.\n  * @api\n  */\n  setSize(maxCacheSize) {\n    this.maxCacheSize_ = maxCacheSize;\n    this.expire();\n  }\n}\n\n\n/**\n * @param {string} src Src.\n * @param {?string} crossOrigin Cross origin.\n * @param {module:ol/color~Color} color Color.\n * @return {string} Cache key.\n */\nfunction getKey(src, crossOrigin, color) {\n  const colorString = color ? asString(color) : 'null';\n  return crossOrigin + ':' + src + ':' + colorString;\n}\n\n\nexport default IconImageCache;\n\n\n/**\n * The {@link module:ol/style/IconImageCache~IconImageCache} for\n * {@link module:ol/style/Icon~Icon} images.\n * @api\n */\nexport const shared = new IconImageCache();\n","/**\n * @module ol/loadingstrategy\n */\n\n\n/**\n * Strategy function for loading all features with a single request.\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {number} resolution Resolution.\n * @return {Array<module:ol/extent~Extent>} Extents.\n * @api\n */\nexport function all(extent, resolution) {\n  return [[-Infinity, -Infinity, Infinity, Infinity]];\n}\n\n\n/**\n * Strategy function for loading features based on the view's extent and\n * resolution.\n * @param {module:ol/extent~Extent} extent Extent.\n * @param {number} resolution Resolution.\n * @return {Array<module:ol/extent~Extent>} Extents.\n * @api\n */\nexport function bbox(extent, resolution) {\n  return [extent];\n}\n\n\n/**\n * Creates a strategy function for loading features based on a tile grid.\n * @param {module:ol/tilegrid/TileGrid} tileGrid Tile grid.\n * @return {function(module:ol/extent~Extent, number): Array<module:ol/extent~Extent>} Loading strategy.\n * @api\n */\nexport function tile(tileGrid) {\n  return (\n    /**\n     * @param {module:ol/extent~Extent} extent Extent.\n     * @param {number} resolution Resolution.\n     * @return {Array<module:ol/extent~Extent>} Extents.\n     */\n    function(extent, resolution) {\n      const z = tileGrid.getZForResolution(resolution);\n      const tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);\n      /** @type {Array<module:ol/extent~Extent>} */\n      const extents = [];\n      /** @type {module:ol/tilecoord~TileCoord} */\n      const tileCoord = [z, 0, 0];\n      for (tileCoord[1] = tileRange.minX; tileCoord[1] <= tileRange.maxX; ++tileCoord[1]) {\n        for (tileCoord[2] = tileRange.minY; tileCoord[2] <= tileRange.maxY; ++tileCoord[2]) {\n          extents.push(tileGrid.getTileCoordExtent(tileCoord));\n        }\n      }\n      return extents;\n    }\n  );\n}\n","/**\n * @module ol/source/VectorEventType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  /**\n   * Triggered when a feature is added to the source.\n   * @event ol/source/Vector~VectorSourceEvent#addfeature\n   * @api\n   */\n  ADDFEATURE: 'addfeature',\n\n  /**\n   * Triggered when a feature is updated.\n   * @event ol/source/Vector~VectorSourceEvent#changefeature\n   * @api\n   */\n  CHANGEFEATURE: 'changefeature',\n\n  /**\n   * Triggered when the clear method is called on the source.\n   * @event ol/source/Vector~VectorSourceEvent#clear\n   * @api\n   */\n  CLEAR: 'clear',\n\n  /**\n   * Triggered when a feature is removed from the source.\n   * See {@link module:ol/source/Vector#clear source.clear()} for exceptions.\n   * @event ol/source/Vector~VectorSourceEvent#removefeature\n   * @api\n   */\n  REMOVEFEATURE: 'removefeature'\n};\n","/**\n * @module ol/structs/RBush\n */\nimport {getUid} from '../util.js';\nimport rbush from 'rbush';\nimport {createOrUpdate, equals} from '../extent.js';\nimport {isEmpty} from '../obj.js';\n\n/**\n * @typedef {Object} Entry\n * @property {number} minX\n * @property {number} minY\n * @property {number} maxX\n * @property {number} maxY\n * @property {Object} [value]\n */\n\n/**\n * @classdesc\n * Wrapper around the RBush by Vladimir Agafonkin.\n * See https://github.com/mourner/rbush.\n *\n * @template T\n */\nclass RBush {\n  /**\n   * @param {number=} opt_maxEntries Max entries.\n   */\n  constructor(opt_maxEntries) {\n\n    /**\n     * @private\n     */\n    this.rbush_ = rbush(opt_maxEntries, undefined);\n\n    /**\n     * A mapping between the objects added to this rbush wrapper\n     * and the objects that are actually added to the internal rbush.\n     * @private\n     * @type {Object<number, module:ol/structs/RBush~Entry>}\n     */\n    this.items_ = {};\n\n  }\n\n  /**\n   * Insert a value into the RBush.\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {T} value Value.\n   */\n  insert(extent, value) {\n    /** @type {module:ol/structs/RBush~Entry} */\n    const item = {\n      minX: extent[0],\n      minY: extent[1],\n      maxX: extent[2],\n      maxY: extent[3],\n      value: value\n    };\n\n    this.rbush_.insert(item);\n    this.items_[getUid(value)] = item;\n  }\n\n\n  /**\n   * Bulk-insert values into the RBush.\n   * @param {Array<module:ol/extent~Extent>} extents Extents.\n   * @param {Array<T>} values Values.\n   */\n  load(extents, values) {\n    const items = new Array(values.length);\n    for (let i = 0, l = values.length; i < l; i++) {\n      const extent = extents[i];\n      const value = values[i];\n\n      /** @type {module:ol/structs/RBush~Entry} */\n      const item = {\n        minX: extent[0],\n        minY: extent[1],\n        maxX: extent[2],\n        maxY: extent[3],\n        value: value\n      };\n      items[i] = item;\n      this.items_[getUid(value)] = item;\n    }\n    this.rbush_.load(items);\n  }\n\n\n  /**\n   * Remove a value from the RBush.\n   * @param {T} value Value.\n   * @return {boolean} Removed.\n   */\n  remove(value) {\n    const uid = getUid(value);\n\n    // get the object in which the value was wrapped when adding to the\n    // internal rbush. then use that object to do the removal.\n    const item = this.items_[uid];\n    delete this.items_[uid];\n    return this.rbush_.remove(item) !== null;\n  }\n\n\n  /**\n   * Update the extent of a value in the RBush.\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {T} value Value.\n   */\n  update(extent, value) {\n    const item = this.items_[getUid(value)];\n    const bbox = [item.minX, item.minY, item.maxX, item.maxY];\n    if (!equals(bbox, extent)) {\n      this.remove(value);\n      this.insert(extent, value);\n    }\n  }\n\n\n  /**\n   * Return all values in the RBush.\n   * @return {Array<T>} All.\n   */\n  getAll() {\n    const items = this.rbush_.all();\n    return items.map(function(item) {\n      return item.value;\n    });\n  }\n\n\n  /**\n   * Return all values in the given extent.\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @return {Array<T>} All in extent.\n   */\n  getInExtent(extent) {\n    /** @type {module:ol/structs/RBush~Entry} */\n    const bbox = {\n      minX: extent[0],\n      minY: extent[1],\n      maxX: extent[2],\n      maxY: extent[3]\n    };\n    const items = this.rbush_.search(bbox);\n    return items.map(function(item) {\n      return item.value;\n    });\n  }\n\n\n  /**\n   * Calls a callback function with each value in the tree.\n   * If the callback returns a truthy value, this value is returned without\n   * checking the rest of the tree.\n   * @param {function(this: S, T): *} callback Callback.\n   * @param {S=} opt_this The object to use as `this` in `callback`.\n   * @return {*} Callback return value.\n   * @template S\n   */\n  forEach(callback, opt_this) {\n    return this.forEach_(this.getAll(), callback, opt_this);\n  }\n\n\n  /**\n   * Calls a callback function with each value in the provided extent.\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {function(this: S, T): *} callback Callback.\n   * @param {S=} opt_this The object to use as `this` in `callback`.\n   * @return {*} Callback return value.\n   * @template S\n   */\n  forEachInExtent(extent, callback, opt_this) {\n    return this.forEach_(this.getInExtent(extent), callback, opt_this);\n  }\n\n\n  /**\n   * @param {Array<T>} values Values.\n   * @param {function(this: S, T): *} callback Callback.\n   * @param {S=} opt_this The object to use as `this` in `callback`.\n   * @private\n   * @return {*} Callback return value.\n   * @template S\n   */\n  forEach_(values, callback, opt_this) {\n    let result;\n    for (let i = 0, l = values.length; i < l; i++) {\n      result = callback.call(opt_this, values[i]);\n      if (result) {\n        return result;\n      }\n    }\n    return result;\n  }\n\n\n  /**\n   * @return {boolean} Is empty.\n   */\n  isEmpty() {\n    return isEmpty(this.items_);\n  }\n\n\n  /**\n   * Remove all values from the RBush.\n   */\n  clear() {\n    this.rbush_.clear();\n    this.items_ = {};\n  }\n\n\n  /**\n   * @param {module:ol/extent~Extent=} opt_extent Extent.\n   * @return {module:ol/extent~Extent} Extent.\n   */\n  getExtent(opt_extent) {\n    // FIXME add getExtent() to rbush\n    const data = this.rbush_.data;\n    return createOrUpdate(data.minX, data.minY, data.maxX, data.maxY, opt_extent);\n  }\n\n\n  /**\n   * @param {module:ol/structs/RBush} rbush R-Tree.\n   */\n  concat(rbush) {\n    this.rbush_.load(rbush.rbush_.all());\n    for (const i in rbush.items_) {\n      this.items_[i | 0] = rbush.items_[i | 0];\n    }\n  }\n\n}\n\n\nexport default RBush;\n","/**\n * @module ol/source/Vector\n */\n\nimport {getUid} from '../util.js';\nimport Collection from '../Collection.js';\nimport CollectionEventType from '../CollectionEventType.js';\nimport ObjectEventType from '../ObjectEventType.js';\nimport {extend} from '../array.js';\nimport {assert} from '../asserts.js';\nimport {listen, unlistenByKey} from '../events.js';\nimport Event from '../events/Event.js';\nimport EventType from '../events/EventType.js';\nimport {containsExtent, equals} from '../extent.js';\nimport {xhr} from '../featureloader.js';\nimport {TRUE, VOID} from '../functions.js';\nimport {all as allStrategy} from '../loadingstrategy.js';\nimport {isEmpty, getValues} from '../obj.js';\nimport Source from '../source/Source.js';\nimport SourceState from '../source/State.js';\nimport VectorEventType from '../source/VectorEventType.js';\nimport RBush from '../structs/RBush.js';\n\n/**\n * A function that takes an {@link module:ol/extent~Extent} and a resolution as arguments, and\n * returns an array of {@link module:ol/extent~Extent} with the extents to load. Usually this\n * is one of the standard {@link module:ol/loadingstrategy} strategies.\n *\n * @typedef {function(module:ol/extent~Extent, number): Array<module:ol/extent~Extent>} LoadingStrategy\n * @api\n */\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/source/Vector} instances are instances of this\n * type.\n */\nexport class VectorSourceEvent extends Event {\n\n  /**\n   * @param {string} type Type.\n   * @param {module:ol/Feature=} opt_feature Feature.\n   */\n  constructor(type, opt_feature) {\n\n    super(type);\n\n    /**\n     * The feature being added or removed.\n     * @type {module:ol/Feature|undefined}\n     * @api\n     */\n    this.feature = opt_feature;\n\n  }\n\n}\n\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/source/Source~AttributionLike} [attributions] Attributions.\n * @property {Array<module:ol/Feature>|module:ol/Collection<module:ol/Feature>} [features]\n * Features. If provided as {@link module:ol/Collection}, the features in the source\n * and the collection will stay in sync.\n * @property {module:ol/format/Feature} [format] The feature format used by the XHR\n * feature loader when `url` is set. Required if `url` is set, otherwise ignored.\n * @property {module:ol/featureloader~FeatureLoader} [loader]\n * The loader function used to load features, from a remote source for example.\n * If this is not set and `url` is set, the source will create and use an XHR\n * feature loader.\n *\n * Example:\n *\n * ```js\n * import {Vector} from 'ol/source';\n * import {GeoJSON} from 'ol/format';\n * import {bbox} from 'ol/loadingstrategy';\n *\n * var vectorSource = new Vector({\n *   format: new GeoJSON(),\n *   loader: function(extent, resolution, projection) {\n *      var proj = projection.getCode();\n *      var url = 'https://ahocevar.com/geoserver/wfs?service=WFS&' +\n *          'version=1.1.0&request=GetFeature&typename=osm:water_areas&' +\n *          'outputFormat=application/json&srsname=' + proj + '&' +\n *          'bbox=' + extent.join(',') + ',' + proj;\n *      var xhr = new XMLHttpRequest();\n *      xhr.open('GET', url);\n *      var onError = function() {\n *        vectorSource.removeLoadedExtent(extent);\n *      }\n *      xhr.onerror = onError;\n *      xhr.onload = function() {\n *        if (xhr.status == 200) {\n *          vectorSource.addFeatures(\n *              vectorSource.getFormat().readFeatures(xhr.responseText));\n *        } else {\n *          onError();\n *        }\n *      }\n *      xhr.send();\n *    },\n *    strategy: bbox\n *  });\n * ```\n * @property {boolean} [overlaps=true] This source may have overlapping geometries.\n * Setting this to `false` (e.g. for sources with polygons that represent administrative\n * boundaries or TopoJSON sources) allows the renderer to optimise fill and\n * stroke operations.\n * @property {module:ol/source/Vector~LoadingStrategy} [strategy] The loading strategy to use.\n * By default an {@link module:ol/loadingstrategy~all}\n * strategy is used, a one-off strategy which loads all features at once.\n * @property {string|module:ol/featureloader~FeatureUrlfunction} [url]\n * Setting this option instructs the source to load features using an XHR loader\n * (see {@link module:ol/featureloader~xhr}). Use a `string` and an\n * {@link module:ol/loadingstrategy~all} for a one-off download of all features from\n * the given URL. Use a {@link module:ol/featureloader~FeatureUrlfunction} to generate the url with\n * other loading strategies.\n * Requires `format` to be set as well.\n * When default XHR feature loader is provided, the features will\n * be transformed from the data projection to the view projection\n * during parsing. If your remote data source does not advertise its projection\n * properly, this transformation will be incorrect. For some formats, the\n * default projection (usually EPSG:4326) can be overridden by setting the\n * dataProjection constructor option on the format.\n * Note that if a source contains non-feature data, such as a GeoJSON geometry\n * or a KML NetworkLink, these will be ignored. Use a custom loader to load these.\n * @property {boolean} [useSpatialIndex=true]\n * By default, an RTree is used as spatial index. When features are removed and\n * added frequently, and the total number of features is low, setting this to\n * `false` may improve performance.\n *\n * Note that\n * {@link module:ol/source/Vector~VectorSource#getFeaturesInExtent},\n * {@link module:ol/source/Vector~VectorSource#getClosestFeatureToCoordinate} and\n * {@link module:ol/source/Vector~VectorSource#getExtent} cannot be used when `useSpatialIndex` is\n * set to `false`, and {@link module:ol/source/Vector~VectorSource#forEachFeatureInExtent} will loop\n * through all features.\n *\n * When set to `false`, the features will be maintained in an\n * {@link module:ol/Collection}, which can be retrieved through\n * {@link module:ol/source/Vector~VectorSource#getFeaturesCollection}.\n * @property {boolean} [wrapX=true] Wrap the world horizontally. For vector editing across the\n * -180° and 180° meridians to work properly, this should be set to `false`. The\n * resulting geometry coordinates will then exceed the world bounds.\n */\n\n\n/**\n * @classdesc\n * Provides a source of features for vector layers. Vector features provided\n * by this source are suitable for editing. See {@link module:ol/source/VectorTile~VectorTile} for\n * vector data that is optimized for rendering.\n *\n * @fires ol/source/Vector~VectorSourceEvent\n * @api\n */\nclass VectorSource extends Source {\n  /**\n   * @param {module:ol/source/Vector~Options=} opt_options Vector source options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n\n    super({\n      attributions: options.attributions,\n      projection: undefined,\n      state: SourceState.READY,\n      wrapX: options.wrapX !== undefined ? options.wrapX : true\n    });\n\n    /**\n     * @private\n     * @type {module:ol/featureloader~FeatureLoader}\n     */\n    this.loader_ = VOID;\n\n    /**\n     * @private\n     * @type {module:ol/format/Feature|undefined}\n     */\n    this.format_ = options.format;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.overlaps_ = options.overlaps == undefined ? true : options.overlaps;\n\n    /**\n     * @private\n     * @type {string|module:ol/featureloader~FeatureUrlFunction|undefined}\n     */\n    this.url_ = options.url;\n\n    if (options.loader !== undefined) {\n      this.loader_ = options.loader;\n    } else if (this.url_ !== undefined) {\n      assert(this.format_, 7); // `format` must be set when `url` is set\n      // create a XHR feature loader for \"url\" and \"format\"\n      this.loader_ = xhr(this.url_, /** @type {module:ol/format/Feature} */ (this.format_));\n    }\n\n    /**\n     * @private\n     * @type {module:ol/source/Vector~LoadingStrategy}\n     */\n    this.strategy_ = options.strategy !== undefined ? options.strategy : allStrategy;\n\n    const useSpatialIndex =\n        options.useSpatialIndex !== undefined ? options.useSpatialIndex : true;\n\n    /**\n     * @private\n     * @type {module:ol/structs/RBush<module:ol/Feature>}\n     */\n    this.featuresRtree_ = useSpatialIndex ? new RBush() : null;\n\n    /**\n     * @private\n     * @type {module:ol/structs/RBush<{extent: module:ol/extent~Extent}>}\n     */\n    this.loadedExtentsRtree_ = new RBush();\n\n    /**\n     * @private\n     * @type {!Object<string, module:ol/Feature>}\n     */\n    this.nullGeometryFeatures_ = {};\n\n    /**\n     * A lookup of features by id (the return from feature.getId()).\n     * @private\n     * @type {!Object<string, module:ol/Feature>}\n     */\n    this.idIndex_ = {};\n\n    /**\n     * A lookup of features without id (keyed by getUid(feature)).\n     * @private\n     * @type {!Object<string, module:ol/Feature>}\n     */\n    this.undefIdIndex_ = {};\n\n    /**\n     * @private\n     * @type {Object<string, Array<module:ol/events~EventsKey>>}\n     */\n    this.featureChangeKeys_ = {};\n\n    /**\n     * @private\n     * @type {module:ol/Collection<module:ol/Feature>}\n     */\n    this.featuresCollection_ = null;\n\n    let collection, features;\n    if (options.features instanceof Collection) {\n      collection = options.features;\n      features = collection.getArray();\n    } else if (Array.isArray(options.features)) {\n      features = options.features;\n    }\n    if (!useSpatialIndex && collection === undefined) {\n      collection = new Collection(features);\n    }\n    if (features !== undefined) {\n      this.addFeaturesInternal(features);\n    }\n    if (collection !== undefined) {\n      this.bindFeaturesCollection_(collection);\n    }\n\n  }\n\n  /**\n   * Add a single feature to the source.  If you want to add a batch of features\n   * at once, call {@link module:ol/source/Vector~VectorSource#addFeatures #addFeatures()}\n   * instead. A feature will not be added to the source if feature with\n   * the same id is already there. The reason for this behavior is to avoid\n   * feature duplication when using bbox or tile loading strategies.\n   * @param {module:ol/Feature} feature Feature to add.\n   * @api\n   */\n  addFeature(feature) {\n    this.addFeatureInternal(feature);\n    this.changed();\n  }\n\n\n  /**\n   * Add a feature without firing a `change` event.\n   * @param {module:ol/Feature} feature Feature.\n   * @protected\n   */\n  addFeatureInternal(feature) {\n    const featureKey = getUid(feature).toString();\n\n    if (!this.addToIndex_(featureKey, feature)) {\n      return;\n    }\n\n    this.setupChangeEvents_(featureKey, feature);\n\n    const geometry = feature.getGeometry();\n    if (geometry) {\n      const extent = geometry.getExtent();\n      if (this.featuresRtree_) {\n        this.featuresRtree_.insert(extent, feature);\n      }\n    } else {\n      this.nullGeometryFeatures_[featureKey] = feature;\n    }\n\n    this.dispatchEvent(\n      new VectorSourceEvent(VectorEventType.ADDFEATURE, feature));\n  }\n\n\n  /**\n   * @param {string} featureKey Unique identifier for the feature.\n   * @param {module:ol/Feature} feature The feature.\n   * @private\n   */\n  setupChangeEvents_(featureKey, feature) {\n    this.featureChangeKeys_[featureKey] = [\n      listen(feature, EventType.CHANGE,\n        this.handleFeatureChange_, this),\n      listen(feature, ObjectEventType.PROPERTYCHANGE,\n        this.handleFeatureChange_, this)\n    ];\n  }\n\n\n  /**\n   * @param {string} featureKey Unique identifier for the feature.\n   * @param {module:ol/Feature} feature The feature.\n   * @return {boolean} The feature is \"valid\", in the sense that it is also a\n   *     candidate for insertion into the Rtree.\n   * @private\n   */\n  addToIndex_(featureKey, feature) {\n    let valid = true;\n    const id = feature.getId();\n    if (id !== undefined) {\n      if (!(id.toString() in this.idIndex_)) {\n        this.idIndex_[id.toString()] = feature;\n      } else {\n        valid = false;\n      }\n    } else {\n      assert(!(featureKey in this.undefIdIndex_),\n        30); // The passed `feature` was already added to the source\n      this.undefIdIndex_[featureKey] = feature;\n    }\n    return valid;\n  }\n\n\n  /**\n   * Add a batch of features to the source.\n   * @param {Array<module:ol/Feature>} features Features to add.\n   * @api\n   */\n  addFeatures(features) {\n    this.addFeaturesInternal(features);\n    this.changed();\n  }\n\n\n  /**\n   * Add features without firing a `change` event.\n   * @param {Array<module:ol/Feature>} features Features.\n   * @protected\n   */\n  addFeaturesInternal(features) {\n    const extents = [];\n    const newFeatures = [];\n    const geometryFeatures = [];\n\n    for (let i = 0, length = features.length; i < length; i++) {\n      const feature = features[i];\n      const featureKey = getUid(feature).toString();\n      if (this.addToIndex_(featureKey, feature)) {\n        newFeatures.push(feature);\n      }\n    }\n\n    for (let i = 0, length = newFeatures.length; i < length; i++) {\n      const feature = newFeatures[i];\n      const featureKey = getUid(feature).toString();\n      this.setupChangeEvents_(featureKey, feature);\n\n      const geometry = feature.getGeometry();\n      if (geometry) {\n        const extent = geometry.getExtent();\n        extents.push(extent);\n        geometryFeatures.push(feature);\n      } else {\n        this.nullGeometryFeatures_[featureKey] = feature;\n      }\n    }\n    if (this.featuresRtree_) {\n      this.featuresRtree_.load(extents, geometryFeatures);\n    }\n\n    for (let i = 0, length = newFeatures.length; i < length; i++) {\n      this.dispatchEvent(new VectorSourceEvent(VectorEventType.ADDFEATURE, newFeatures[i]));\n    }\n  }\n\n\n  /**\n   * @param {!module:ol/Collection<module:ol/Feature>} collection Collection.\n   * @private\n   */\n  bindFeaturesCollection_(collection) {\n    let modifyingCollection = false;\n    listen(this, VectorEventType.ADDFEATURE,\n      function(evt) {\n        if (!modifyingCollection) {\n          modifyingCollection = true;\n          collection.push(evt.feature);\n          modifyingCollection = false;\n        }\n      });\n    listen(this, VectorEventType.REMOVEFEATURE,\n      function(evt) {\n        if (!modifyingCollection) {\n          modifyingCollection = true;\n          collection.remove(evt.feature);\n          modifyingCollection = false;\n        }\n      });\n    listen(collection, CollectionEventType.ADD,\n      function(evt) {\n        if (!modifyingCollection) {\n          modifyingCollection = true;\n          this.addFeature(/** @type {module:ol/Feature} */ (evt.element));\n          modifyingCollection = false;\n        }\n      }, this);\n    listen(collection, CollectionEventType.REMOVE,\n      function(evt) {\n        if (!modifyingCollection) {\n          modifyingCollection = true;\n          this.removeFeature(/** @type {module:ol/Feature} */ (evt.element));\n          modifyingCollection = false;\n        }\n      }, this);\n    this.featuresCollection_ = collection;\n  }\n\n\n  /**\n   * Remove all features from the source.\n   * @param {boolean=} opt_fast Skip dispatching of {@link module:ol/source/Vector~VectorSourceEvent#removefeature} events.\n   * @api\n   */\n  clear(opt_fast) {\n    if (opt_fast) {\n      for (const featureId in this.featureChangeKeys_) {\n        const keys = this.featureChangeKeys_[featureId];\n        keys.forEach(unlistenByKey);\n      }\n      if (!this.featuresCollection_) {\n        this.featureChangeKeys_ = {};\n        this.idIndex_ = {};\n        this.undefIdIndex_ = {};\n      }\n    } else {\n      if (this.featuresRtree_) {\n        this.featuresRtree_.forEach(this.removeFeatureInternal, this);\n        for (const id in this.nullGeometryFeatures_) {\n          this.removeFeatureInternal(this.nullGeometryFeatures_[id]);\n        }\n      }\n    }\n    if (this.featuresCollection_) {\n      this.featuresCollection_.clear();\n    }\n\n    if (this.featuresRtree_) {\n      this.featuresRtree_.clear();\n    }\n    this.loadedExtentsRtree_.clear();\n    this.nullGeometryFeatures_ = {};\n\n    const clearEvent = new VectorSourceEvent(VectorEventType.CLEAR);\n    this.dispatchEvent(clearEvent);\n    this.changed();\n  }\n\n\n  /**\n   * Iterate through all features on the source, calling the provided callback\n   * with each one.  If the callback returns any \"truthy\" value, iteration will\n   * stop and the function will return the same value.\n   * Note: this function only iterate through the feature that have a defined geometry.\n   *\n   * @param {function(module:ol/Feature): T} callback Called with each feature\n   *     on the source.  Return a truthy value to stop iteration.\n   * @return {T|undefined} The return value from the last call to the callback.\n   * @template T\n   * @api\n   */\n  forEachFeature(callback) {\n    if (this.featuresRtree_) {\n      return this.featuresRtree_.forEach(callback);\n    } else if (this.featuresCollection_) {\n      return this.featuresCollection_.forEach(callback);\n    }\n  }\n\n\n  /**\n   * Iterate through all features whose geometries contain the provided\n   * coordinate, calling the callback with each feature.  If the callback returns\n   * a \"truthy\" value, iteration will stop and the function will return the same\n   * value.\n   *\n   * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n   * @param {function(module:ol/Feature): T} callback Called with each feature\n   *     whose goemetry contains the provided coordinate.\n   * @return {T|undefined} The return value from the last call to the callback.\n   * @template T\n   */\n  forEachFeatureAtCoordinateDirect(coordinate, callback) {\n    const extent = [coordinate[0], coordinate[1], coordinate[0], coordinate[1]];\n    return this.forEachFeatureInExtent(extent, function(feature) {\n      const geometry = feature.getGeometry();\n      if (geometry.intersectsCoordinate(coordinate)) {\n        return callback(feature);\n      } else {\n        return undefined;\n      }\n    });\n  }\n\n\n  /**\n   * Iterate through all features whose bounding box intersects the provided\n   * extent (note that the feature's geometry may not intersect the extent),\n   * calling the callback with each feature.  If the callback returns a \"truthy\"\n   * value, iteration will stop and the function will return the same value.\n   *\n   * If you are interested in features whose geometry intersects an extent, call\n   * the {@link module:ol/source/Vector~VectorSource#forEachFeatureIntersectingExtent #forEachFeatureIntersectingExtent()} method instead.\n   *\n   * When `useSpatialIndex` is set to false, this method will loop through all\n   * features, equivalent to {@link module:ol/source/Vector~VectorSource#forEachFeature #forEachFeature()}.\n   *\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {function(module:ol/Feature): T} callback Called with each feature\n   *     whose bounding box intersects the provided extent.\n   * @return {T|undefined} The return value from the last call to the callback.\n   * @template T\n   * @api\n   */\n  forEachFeatureInExtent(extent, callback) {\n    if (this.featuresRtree_) {\n      return this.featuresRtree_.forEachInExtent(extent, callback);\n    } else if (this.featuresCollection_) {\n      return this.featuresCollection_.forEach(callback);\n    }\n  }\n\n\n  /**\n   * Iterate through all features whose geometry intersects the provided extent,\n   * calling the callback with each feature.  If the callback returns a \"truthy\"\n   * value, iteration will stop and the function will return the same value.\n   *\n   * If you only want to test for bounding box intersection, call the\n   * {@link module:ol/source/Vector~VectorSource#forEachFeatureInExtent #forEachFeatureInExtent()} method instead.\n   *\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {function(module:ol/Feature): T} callback Called with each feature\n   *     whose geometry intersects the provided extent.\n   * @return {T|undefined} The return value from the last call to the callback.\n   * @template T\n   * @api\n   */\n  forEachFeatureIntersectingExtent(extent, callback) {\n    return this.forEachFeatureInExtent(extent,\n      /**\n       * @param {module:ol/Feature} feature Feature.\n       * @return {T|undefined} The return value from the last call to the callback.\n       * @template T\n       */\n      function(feature) {\n        const geometry = feature.getGeometry();\n        if (geometry.intersectsExtent(extent)) {\n          const result = callback(feature);\n          if (result) {\n            return result;\n          }\n        }\n      });\n  }\n\n\n  /**\n   * Get the features collection associated with this source. Will be `null`\n   * unless the source was configured with `useSpatialIndex` set to `false`, or\n   * with an {@link module:ol/Collection} as `features`.\n   * @return {module:ol/Collection<module:ol/Feature>} The collection of features.\n   * @api\n   */\n  getFeaturesCollection() {\n    return this.featuresCollection_;\n  }\n\n\n  /**\n   * Get all features on the source in random order.\n   * @return {Array<module:ol/Feature>} Features.\n   * @api\n   */\n  getFeatures() {\n    let features;\n    if (this.featuresCollection_) {\n      features = this.featuresCollection_.getArray();\n    } else if (this.featuresRtree_) {\n      features = this.featuresRtree_.getAll();\n      if (!isEmpty(this.nullGeometryFeatures_)) {\n        extend(features, getValues(this.nullGeometryFeatures_));\n      }\n    }\n    return (\n      /** @type {Array<module:ol/Feature>} */ (features)\n    );\n  }\n\n\n  /**\n   * Get all features whose geometry intersects the provided coordinate.\n   * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n   * @return {Array<module:ol/Feature>} Features.\n   * @api\n   */\n  getFeaturesAtCoordinate(coordinate) {\n    const features = [];\n    this.forEachFeatureAtCoordinateDirect(coordinate, function(feature) {\n      features.push(feature);\n    });\n    return features;\n  }\n\n\n  /**\n   * Get all features in the provided extent.  Note that this returns an array of\n   * all features intersecting the given extent in random order (so it may include\n   * features whose geometries do not intersect the extent).\n   *\n   * This method is not available when the source is configured with\n   * `useSpatialIndex` set to `false`.\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @return {Array<module:ol/Feature>} Features.\n   * @api\n   */\n  getFeaturesInExtent(extent) {\n    return this.featuresRtree_.getInExtent(extent);\n  }\n\n\n  /**\n   * Get the closest feature to the provided coordinate.\n   *\n   * This method is not available when the source is configured with\n   * `useSpatialIndex` set to `false`.\n   * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n   * @param {function(module:ol/Feature):boolean=} opt_filter Feature filter function.\n   *     The filter function will receive one argument, the {@link module:ol/Feature feature}\n   *     and it should return a boolean value. By default, no filtering is made.\n   * @return {module:ol/Feature} Closest feature.\n   * @api\n   */\n  getClosestFeatureToCoordinate(coordinate, opt_filter) {\n    // Find the closest feature using branch and bound.  We start searching an\n    // infinite extent, and find the distance from the first feature found.  This\n    // becomes the closest feature.  We then compute a smaller extent which any\n    // closer feature must intersect.  We continue searching with this smaller\n    // extent, trying to find a closer feature.  Every time we find a closer\n    // feature, we update the extent being searched so that any even closer\n    // feature must intersect it.  We continue until we run out of features.\n    const x = coordinate[0];\n    const y = coordinate[1];\n    let closestFeature = null;\n    const closestPoint = [NaN, NaN];\n    let minSquaredDistance = Infinity;\n    const extent = [-Infinity, -Infinity, Infinity, Infinity];\n    const filter = opt_filter ? opt_filter : TRUE;\n    this.featuresRtree_.forEachInExtent(extent,\n      /**\n       * @param {module:ol/Feature} feature Feature.\n       */\n      function(feature) {\n        if (filter(feature)) {\n          const geometry = feature.getGeometry();\n          const previousMinSquaredDistance = minSquaredDistance;\n          minSquaredDistance = geometry.closestPointXY(\n            x, y, closestPoint, minSquaredDistance);\n          if (minSquaredDistance < previousMinSquaredDistance) {\n            closestFeature = feature;\n            // This is sneaky.  Reduce the extent that it is currently being\n            // searched while the R-Tree traversal using this same extent object\n            // is still in progress.  This is safe because the new extent is\n            // strictly contained by the old extent.\n            const minDistance = Math.sqrt(minSquaredDistance);\n            extent[0] = x - minDistance;\n            extent[1] = y - minDistance;\n            extent[2] = x + minDistance;\n            extent[3] = y + minDistance;\n          }\n        }\n      });\n    return closestFeature;\n  }\n\n\n  /**\n   * Get the extent of the features currently in the source.\n   *\n   * This method is not available when the source is configured with\n   * `useSpatialIndex` set to `false`.\n   * @param {module:ol/extent~Extent=} opt_extent Destination extent. If provided, no new extent\n   *     will be created. Instead, that extent's coordinates will be overwritten.\n   * @return {module:ol/extent~Extent} Extent.\n   * @api\n   */\n  getExtent(opt_extent) {\n    return this.featuresRtree_.getExtent(opt_extent);\n  }\n\n\n  /**\n   * Get a feature by its identifier (the value returned by feature.getId()).\n   * Note that the index treats string and numeric identifiers as the same.  So\n   * `source.getFeatureById(2)` will return a feature with id `'2'` or `2`.\n   *\n   * @param {string|number} id Feature identifier.\n   * @return {module:ol/Feature} The feature (or `null` if not found).\n   * @api\n   */\n  getFeatureById(id) {\n    const feature = this.idIndex_[id.toString()];\n    return feature !== undefined ? feature : null;\n  }\n\n\n  /**\n   * Get the format associated with this source.\n   *\n   * @return {module:ol/format/Feature|undefined} The feature format.\n   * @api\n   */\n  getFormat() {\n    return this.format_;\n  }\n\n\n  /**\n   * @return {boolean} The source can have overlapping geometries.\n   */\n  getOverlaps() {\n    return this.overlaps_;\n  }\n\n\n  /**\n   * @override\n   */\n  getResolutions() {}\n\n\n  /**\n   * Get the url associated with this source.\n   *\n   * @return {string|module:ol/featureloader~FeatureUrlFunction|undefined} The url.\n   * @api\n   */\n  getUrl() {\n    return this.url_;\n  }\n\n\n  /**\n   * @param {module:ol/events/Event} event Event.\n   * @private\n   */\n  handleFeatureChange_(event) {\n    const feature = /** @type {module:ol/Feature} */ (event.target);\n    const featureKey = getUid(feature).toString();\n    const geometry = feature.getGeometry();\n    if (!geometry) {\n      if (!(featureKey in this.nullGeometryFeatures_)) {\n        if (this.featuresRtree_) {\n          this.featuresRtree_.remove(feature);\n        }\n        this.nullGeometryFeatures_[featureKey] = feature;\n      }\n    } else {\n      const extent = geometry.getExtent();\n      if (featureKey in this.nullGeometryFeatures_) {\n        delete this.nullGeometryFeatures_[featureKey];\n        if (this.featuresRtree_) {\n          this.featuresRtree_.insert(extent, feature);\n        }\n      } else {\n        if (this.featuresRtree_) {\n          this.featuresRtree_.update(extent, feature);\n        }\n      }\n    }\n    const id = feature.getId();\n    if (id !== undefined) {\n      const sid = id.toString();\n      if (featureKey in this.undefIdIndex_) {\n        delete this.undefIdIndex_[featureKey];\n        this.idIndex_[sid] = feature;\n      } else {\n        if (this.idIndex_[sid] !== feature) {\n          this.removeFromIdIndex_(feature);\n          this.idIndex_[sid] = feature;\n        }\n      }\n    } else {\n      if (!(featureKey in this.undefIdIndex_)) {\n        this.removeFromIdIndex_(feature);\n        this.undefIdIndex_[featureKey] = feature;\n      }\n    }\n    this.changed();\n    this.dispatchEvent(new VectorSourceEvent(\n      VectorEventType.CHANGEFEATURE, feature));\n  }\n\n  /**\n   * Returns true if the feature is contained within the source.\n   * @param {module:ol/Feature} feature Feature.\n   * @return {boolean} Has feature.\n   * @api\n   */\n  hasFeature(feature) {\n    const id = feature.getId();\n    if (id !== undefined) {\n      return id in this.idIndex_;\n    } else {\n      const featureKey = getUid(feature).toString();\n      return featureKey in this.undefIdIndex_;\n    }\n  }\n\n  /**\n   * @return {boolean} Is empty.\n   */\n  isEmpty() {\n    return this.featuresRtree_.isEmpty() && isEmpty(this.nullGeometryFeatures_);\n  }\n\n\n  /**\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {number} resolution Resolution.\n   * @param {module:ol/proj/Projection} projection Projection.\n   */\n  loadFeatures(extent, resolution, projection) {\n    const loadedExtentsRtree = this.loadedExtentsRtree_;\n    const extentsToLoad = this.strategy_(extent, resolution);\n    this.loading = false;\n    for (let i = 0, ii = extentsToLoad.length; i < ii; ++i) {\n      const extentToLoad = extentsToLoad[i];\n      const alreadyLoaded = loadedExtentsRtree.forEachInExtent(extentToLoad,\n        /**\n         * @param {{extent: module:ol/extent~Extent}} object Object.\n         * @return {boolean} Contains.\n         */\n        function(object) {\n          return containsExtent(object.extent, extentToLoad);\n        });\n      if (!alreadyLoaded) {\n        this.loader_.call(this, extentToLoad, resolution, projection);\n        loadedExtentsRtree.insert(extentToLoad, {extent: extentToLoad.slice()});\n        this.loading = true;\n      }\n    }\n  }\n\n\n  /**\n   * Remove an extent from the list of loaded extents.\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @api\n   */\n  removeLoadedExtent(extent) {\n    const loadedExtentsRtree = this.loadedExtentsRtree_;\n    let obj;\n    loadedExtentsRtree.forEachInExtent(extent, function(object) {\n      if (equals(object.extent, extent)) {\n        obj = object;\n        return true;\n      }\n    });\n    if (obj) {\n      loadedExtentsRtree.remove(obj);\n    }\n  }\n\n\n  /**\n   * Remove a single feature from the source.  If you want to remove all features\n   * at once, use the {@link module:ol/source/Vector~VectorSource#clear #clear()} method\n   * instead.\n   * @param {module:ol/Feature} feature Feature to remove.\n   * @api\n   */\n  removeFeature(feature) {\n    const featureKey = getUid(feature).toString();\n    if (featureKey in this.nullGeometryFeatures_) {\n      delete this.nullGeometryFeatures_[featureKey];\n    } else {\n      if (this.featuresRtree_) {\n        this.featuresRtree_.remove(feature);\n      }\n    }\n    this.removeFeatureInternal(feature);\n    this.changed();\n  }\n\n\n  /**\n   * Remove feature without firing a `change` event.\n   * @param {module:ol/Feature} feature Feature.\n   * @protected\n   */\n  removeFeatureInternal(feature) {\n    const featureKey = getUid(feature).toString();\n    this.featureChangeKeys_[featureKey].forEach(unlistenByKey);\n    delete this.featureChangeKeys_[featureKey];\n    const id = feature.getId();\n    if (id !== undefined) {\n      delete this.idIndex_[id.toString()];\n    } else {\n      delete this.undefIdIndex_[featureKey];\n    }\n    this.dispatchEvent(new VectorSourceEvent(\n      VectorEventType.REMOVEFEATURE, feature));\n  }\n\n\n  /**\n   * Remove a feature from the id index.  Called internally when the feature id\n   * may have changed.\n   * @param {module:ol/Feature} feature The feature.\n   * @return {boolean} Removed the feature from the index.\n   * @private\n   */\n  removeFromIdIndex_(feature) {\n    let removed = false;\n    for (const id in this.idIndex_) {\n      if (this.idIndex_[id] === feature) {\n        delete this.idIndex_[id];\n        removed = true;\n        break;\n      }\n    }\n    return removed;\n  }\n\n\n  /**\n   * Set the new loader of the source. The next loadFeatures call will use the\n   * new loader.\n   * @param {module:ol/featureloader~FeatureLoader} loader The loader to set.\n   * @api\n   */\n  setLoader(loader) {\n    this.loader_ = loader;\n  }\n\n}\n\n\nexport default VectorSource;\n","/**\n * @module ol/style/Circle\n */\n\nimport RegularShape from '../style/RegularShape.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/style/Fill} [fill] Fill style.\n * @property {number} radius Circle radius.\n * @property {module:ol/style/Stroke} [stroke] Stroke style.\n * @property {module:ol/style/AtlasManager} [atlasManager] The atlas manager to use for this circle.\n * When using WebGL it is recommended to use an atlas manager to avoid texture switching. If an atlas manager is given,\n * the circle is added to an atlas. By default no atlas manager is used.\n */\n\n\n/**\n * @classdesc\n * Set circle style for vector features.\n * @api\n */\nclass CircleStyle extends RegularShape {\n  /**\n   * @param {module:ol/style/Circle~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n\n    super({\n      points: Infinity,\n      fill: options.fill,\n      radius: options.radius,\n      stroke: options.stroke,\n      atlasManager: options.atlasManager\n    });\n\n  }\n\n  /**\n  * Clones the style.  If an atlasmanager was provided to the original style it will be used in the cloned style, too.\n  * @return {module:ol/style/Circle} The cloned style.\n  * @override\n  * @api\n  */\n  clone() {\n    const style = new CircleStyle({\n      fill: this.getFill() ? this.getFill().clone() : undefined,\n      stroke: this.getStroke() ? this.getStroke().clone() : undefined,\n      radius: this.getRadius(),\n      atlasManager: this.atlasManager_\n    });\n    style.setOpacity(this.getOpacity());\n    style.setScale(this.getScale());\n    return style;\n  }\n\n  /**\n  * Set the circle radius.\n  *\n  * @param {number} radius Circle radius.\n  * @api\n  */\n  setRadius(radius) {\n    this.radius_ = radius;\n    this.render_(this.atlasManager_);\n  }\n}\n\n\nexport default CircleStyle;\n","/**\n * @module ol/style/RegularShape\n */\n\nimport {asColorLike} from '../colorlike.js';\nimport {createCanvasContext2D} from '../dom.js';\nimport {CANVAS_LINE_DASH} from '../has.js';\nimport ImageState from '../ImageState.js';\nimport {defaultStrokeStyle, defaultFillStyle, defaultLineCap, defaultLineWidth, defaultLineJoin, defaultMiterLimit} from '../render/canvas.js';\nimport ImageStyle from '../style/Image.js';\n\n\n/**\n * Specify radius for regular polygons, or radius1 and radius2 for stars.\n * @typedef {Object} Options\n * @property {module:ol/style/Fill} [fill] Fill style.\n * @property {number} points Number of points for stars and regular polygons. In case of a polygon, the number of points\n * is the number of sides.\n * @property {number} [radius] Radius of a regular polygon.\n * @property {number} [radius1] Outer radius of a star.\n * @property {number} [radius2] Inner radius of a star.\n * @property {number} [angle=0] Shape's angle in radians. A value of 0 will have one of the shape's point facing up.\n * @property {module:ol/style/Stroke} [stroke] Stroke style.\n * @property {number} [rotation=0] Rotation in radians (positive rotation clockwise).\n * @property {boolean} [rotateWithView=false] Whether to rotate the shape with the view.\n * @property {module:ol/style/AtlasManager} [atlasManager] The atlas manager to use for this symbol. When\n * using WebGL it is recommended to use an atlas manager to avoid texture switching. If an atlas manager is given, the\n * symbol is added to an atlas. By default no atlas manager is used.\n */\n\n\n/**\n * @typedef {Object} RenderOptions\n * @property {module:ol/colorlike~ColorLike} [strokeStyle]\n * @property {number} strokeWidth\n * @property {number} size\n * @property {string} lineCap\n * @property {Array<number>} lineDash\n * @property {number} lineDashOffset\n * @property {string} lineJoin\n * @property {number} miterLimit\n */\n\n\n/**\n * @classdesc\n * Set regular shape style for vector features. The resulting shape will be\n * a regular polygon when `radius` is provided, or a star when `radius1` and\n * `radius2` are provided.\n * @api\n */\nclass RegularShape extends ImageStyle {\n  /**\n   * @param {module:ol/style/RegularShape~Options} options Options.\n   */\n  constructor(options) {\n    /**\n     * @type {boolean}\n     */\n    const rotateWithView = options.rotateWithView !== undefined ?\n      options.rotateWithView : false;\n\n    super({\n      opacity: 1,\n      rotateWithView: rotateWithView,\n      rotation: options.rotation !== undefined ? options.rotation : 0,\n      scale: 1\n    });\n\n    /**\n     * @private\n     * @type {Array<string>}\n     */\n    this.checksums_ = null;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement}\n     */\n    this.canvas_ = null;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement}\n     */\n    this.hitDetectionCanvas_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/style/Fill}\n     */\n    this.fill_ = options.fill !== undefined ? options.fill : null;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.origin_ = [0, 0];\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.points_ = options.points;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.radius_ = /** @type {number} */ (options.radius !== undefined ?\n      options.radius : options.radius1);\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.radius2_ = options.radius2;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.angle_ = options.angle !== undefined ? options.angle : 0;\n\n    /**\n     * @private\n     * @type {module:ol/style/Stroke}\n     */\n    this.stroke_ = options.stroke !== undefined ? options.stroke : null;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.anchor_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/size~Size}\n     */\n    this.size_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/size~Size}\n     */\n    this.imageSize_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/size~Size}\n     */\n    this.hitDetectionImageSize_ = null;\n\n    /**\n     * @protected\n     * @type {module:ol/style/AtlasManager|undefined}\n     */\n    this.atlasManager_ = options.atlasManager;\n\n    this.render_(this.atlasManager_);\n\n  }\n\n  /**\n   * Clones the style. If an atlasmanager was provided to the original style it will be used in the cloned style, too.\n   * @return {module:ol/style/RegularShape} The cloned style.\n   * @api\n   */\n  clone() {\n    const style = new RegularShape({\n      fill: this.getFill() ? this.getFill().clone() : undefined,\n      points: this.getPoints(),\n      radius: this.getRadius(),\n      radius2: this.getRadius2(),\n      angle: this.getAngle(),\n      stroke: this.getStroke() ? this.getStroke().clone() : undefined,\n      rotation: this.getRotation(),\n      rotateWithView: this.getRotateWithView(),\n      atlasManager: this.atlasManager_\n    });\n    style.setOpacity(this.getOpacity());\n    style.setScale(this.getScale());\n    return style;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getAnchor() {\n    return this.anchor_;\n  }\n\n  /**\n   * Get the angle used in generating the shape.\n   * @return {number} Shape's rotation in radians.\n   * @api\n   */\n  getAngle() {\n    return this.angle_;\n  }\n\n  /**\n   * Get the fill style for the shape.\n   * @return {module:ol/style/Fill} Fill style.\n   * @api\n   */\n  getFill() {\n    return this.fill_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getHitDetectionImage(pixelRatio) {\n    return this.hitDetectionCanvas_;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getImage(pixelRatio) {\n    return this.canvas_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getImageSize() {\n    return this.imageSize_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getHitDetectionImageSize() {\n    return this.hitDetectionImageSize_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getImageState() {\n    return ImageState.LOADED;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getOrigin() {\n    return this.origin_;\n  }\n\n  /**\n   * Get the number of points for generating the shape.\n   * @return {number} Number of points for stars and regular polygons.\n   * @api\n   */\n  getPoints() {\n    return this.points_;\n  }\n\n  /**\n   * Get the (primary) radius for the shape.\n   * @return {number} Radius.\n   * @api\n   */\n  getRadius() {\n    return this.radius_;\n  }\n\n  /**\n   * Get the secondary radius for the shape.\n   * @return {number|undefined} Radius2.\n   * @api\n   */\n  getRadius2() {\n    return this.radius2_;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getSize() {\n    return this.size_;\n  }\n\n  /**\n   * Get the stroke style for the shape.\n   * @return {module:ol/style/Stroke} Stroke style.\n   * @api\n   */\n  getStroke() {\n    return this.stroke_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  listenImageChange(listener, thisArg) {}\n\n  /**\n   * @inheritDoc\n   */\n  load() {}\n\n  /**\n   * @inheritDoc\n   */\n  unlistenImageChange(listener, thisArg) {}\n\n  /**\n   * @protected\n   * @param {module:ol/style/AtlasManager|undefined} atlasManager An atlas manager.\n   */\n  render_(atlasManager) {\n    let imageSize;\n    let lineCap = '';\n    let lineJoin = '';\n    let miterLimit = 0;\n    let lineDash = null;\n    let lineDashOffset = 0;\n    let strokeStyle;\n    let strokeWidth = 0;\n\n    if (this.stroke_) {\n      strokeStyle = this.stroke_.getColor();\n      if (strokeStyle === null) {\n        strokeStyle = defaultStrokeStyle;\n      }\n      strokeStyle = asColorLike(strokeStyle);\n      strokeWidth = this.stroke_.getWidth();\n      if (strokeWidth === undefined) {\n        strokeWidth = defaultLineWidth;\n      }\n      lineDash = this.stroke_.getLineDash();\n      lineDashOffset = this.stroke_.getLineDashOffset();\n      if (!CANVAS_LINE_DASH) {\n        lineDash = null;\n        lineDashOffset = 0;\n      }\n      lineJoin = this.stroke_.getLineJoin();\n      if (lineJoin === undefined) {\n        lineJoin = defaultLineJoin;\n      }\n      lineCap = this.stroke_.getLineCap();\n      if (lineCap === undefined) {\n        lineCap = defaultLineCap;\n      }\n      miterLimit = this.stroke_.getMiterLimit();\n      if (miterLimit === undefined) {\n        miterLimit = defaultMiterLimit;\n      }\n    }\n\n    let size = 2 * (this.radius_ + strokeWidth) + 1;\n\n    /** @type {module:ol/style/RegularShape~RenderOptions} */\n    const renderOptions = {\n      strokeStyle: strokeStyle,\n      strokeWidth: strokeWidth,\n      size: size,\n      lineCap: lineCap,\n      lineDash: lineDash,\n      lineDashOffset: lineDashOffset,\n      lineJoin: lineJoin,\n      miterLimit: miterLimit\n    };\n\n    if (atlasManager === undefined) {\n      // no atlas manager is used, create a new canvas\n      const context = createCanvasContext2D(size, size);\n      this.canvas_ = context.canvas;\n\n      // canvas.width and height are rounded to the closest integer\n      size = this.canvas_.width;\n      imageSize = size;\n\n      this.draw_(renderOptions, context, 0, 0);\n\n      this.createHitDetectionCanvas_(renderOptions);\n    } else {\n      // an atlas manager is used, add the symbol to an atlas\n      size = Math.round(size);\n\n      const hasCustomHitDetectionImage = !this.fill_;\n      let renderHitDetectionCallback;\n      if (hasCustomHitDetectionImage) {\n        // render the hit-detection image into a separate atlas image\n        renderHitDetectionCallback =\n            this.drawHitDetectionCanvas_.bind(this, renderOptions);\n      }\n\n      const id = this.getChecksum();\n      const info = atlasManager.add(\n        id, size, size, this.draw_.bind(this, renderOptions),\n        renderHitDetectionCallback);\n\n      this.canvas_ = info.image;\n      this.origin_ = [info.offsetX, info.offsetY];\n      imageSize = info.image.width;\n\n      if (hasCustomHitDetectionImage) {\n        this.hitDetectionCanvas_ = info.hitImage;\n        this.hitDetectionImageSize_ =\n            [info.hitImage.width, info.hitImage.height];\n      } else {\n        this.hitDetectionCanvas_ = this.canvas_;\n        this.hitDetectionImageSize_ = [imageSize, imageSize];\n      }\n    }\n\n    this.anchor_ = [size / 2, size / 2];\n    this.size_ = [size, size];\n    this.imageSize_ = [imageSize, imageSize];\n  }\n\n  /**\n   * @private\n   * @param {module:ol/style/RegularShape~RenderOptions} renderOptions Render options.\n   * @param {CanvasRenderingContext2D} context The rendering context.\n   * @param {number} x The origin for the symbol (x).\n   * @param {number} y The origin for the symbol (y).\n   */\n  draw_(renderOptions, context, x, y) {\n    let i, angle0, radiusC;\n    // reset transform\n    context.setTransform(1, 0, 0, 1, 0, 0);\n\n    // then move to (x, y)\n    context.translate(x, y);\n\n    context.beginPath();\n\n    let points = this.points_;\n    if (points === Infinity) {\n      context.arc(\n        renderOptions.size / 2, renderOptions.size / 2,\n        this.radius_, 0, 2 * Math.PI, true);\n    } else {\n      const radius2 = (this.radius2_ !== undefined) ? this.radius2_\n        : this.radius_;\n      if (radius2 !== this.radius_) {\n        points = 2 * points;\n      }\n      for (i = 0; i <= points; i++) {\n        angle0 = i * 2 * Math.PI / points - Math.PI / 2 + this.angle_;\n        radiusC = i % 2 === 0 ? this.radius_ : radius2;\n        context.lineTo(renderOptions.size / 2 + radiusC * Math.cos(angle0),\n          renderOptions.size / 2 + radiusC * Math.sin(angle0));\n      }\n    }\n\n\n    if (this.fill_) {\n      let color = this.fill_.getColor();\n      if (color === null) {\n        color = defaultFillStyle;\n      }\n      context.fillStyle = asColorLike(color);\n      context.fill();\n    }\n    if (this.stroke_) {\n      context.strokeStyle = renderOptions.strokeStyle;\n      context.lineWidth = renderOptions.strokeWidth;\n      if (renderOptions.lineDash) {\n        context.setLineDash(renderOptions.lineDash);\n        context.lineDashOffset = renderOptions.lineDashOffset;\n      }\n      context.lineCap = renderOptions.lineCap;\n      context.lineJoin = renderOptions.lineJoin;\n      context.miterLimit = renderOptions.miterLimit;\n      context.stroke();\n    }\n    context.closePath();\n  }\n\n  /**\n   * @private\n   * @param {module:ol/style/RegularShape~RenderOptions} renderOptions Render options.\n   */\n  createHitDetectionCanvas_(renderOptions) {\n    this.hitDetectionImageSize_ = [renderOptions.size, renderOptions.size];\n    if (this.fill_) {\n      this.hitDetectionCanvas_ = this.canvas_;\n      return;\n    }\n\n    // if no fill style is set, create an extra hit-detection image with a\n    // default fill style\n    const context = createCanvasContext2D(renderOptions.size, renderOptions.size);\n    this.hitDetectionCanvas_ = context.canvas;\n\n    this.drawHitDetectionCanvas_(renderOptions, context, 0, 0);\n  }\n\n  /**\n   * @private\n   * @param {module:ol/style/RegularShape~RenderOptions} renderOptions Render options.\n   * @param {CanvasRenderingContext2D} context The context.\n   * @param {number} x The origin for the symbol (x).\n   * @param {number} y The origin for the symbol (y).\n   */\n  drawHitDetectionCanvas_(renderOptions, context, x, y) {\n    // reset transform\n    context.setTransform(1, 0, 0, 1, 0, 0);\n\n    // then move to (x, y)\n    context.translate(x, y);\n\n    context.beginPath();\n\n    let points = this.points_;\n    if (points === Infinity) {\n      context.arc(\n        renderOptions.size / 2, renderOptions.size / 2,\n        this.radius_, 0, 2 * Math.PI, true);\n    } else {\n      const radius2 = (this.radius2_ !== undefined) ? this.radius2_\n        : this.radius_;\n      if (radius2 !== this.radius_) {\n        points = 2 * points;\n      }\n      let i, radiusC, angle0;\n      for (i = 0; i <= points; i++) {\n        angle0 = i * 2 * Math.PI / points - Math.PI / 2 + this.angle_;\n        radiusC = i % 2 === 0 ? this.radius_ : radius2;\n        context.lineTo(renderOptions.size / 2 + radiusC * Math.cos(angle0),\n          renderOptions.size / 2 + radiusC * Math.sin(angle0));\n      }\n    }\n\n    context.fillStyle = defaultFillStyle;\n    context.fill();\n    if (this.stroke_) {\n      context.strokeStyle = renderOptions.strokeStyle;\n      context.lineWidth = renderOptions.strokeWidth;\n      if (renderOptions.lineDash) {\n        context.setLineDash(renderOptions.lineDash);\n        context.lineDashOffset = renderOptions.lineDashOffset;\n      }\n      context.stroke();\n    }\n    context.closePath();\n  }\n\n  /**\n   * @return {string} The checksum.\n   */\n  getChecksum() {\n    const strokeChecksum = this.stroke_ ?\n      this.stroke_.getChecksum() : '-';\n    const fillChecksum = this.fill_ ?\n      this.fill_.getChecksum() : '-';\n\n    const recalculate = !this.checksums_ ||\n        (strokeChecksum != this.checksums_[1] ||\n        fillChecksum != this.checksums_[2] ||\n        this.radius_ != this.checksums_[3] ||\n        this.radius2_ != this.checksums_[4] ||\n        this.angle_ != this.checksums_[5] ||\n        this.points_ != this.checksums_[6]);\n\n    if (recalculate) {\n      const checksum = 'r' + strokeChecksum + fillChecksum +\n          (this.radius_ !== undefined ? this.radius_.toString() : '-') +\n          (this.radius2_ !== undefined ? this.radius2_.toString() : '-') +\n          (this.angle_ !== undefined ? this.angle_.toString() : '-') +\n          (this.points_ !== undefined ? this.points_.toString() : '-');\n      this.checksums_ = [checksum, strokeChecksum, fillChecksum,\n        this.radius_, this.radius2_, this.angle_, this.points_];\n    }\n\n    return this.checksums_[0];\n  }\n}\n\n\nexport default RegularShape;\n","var fontWeights = {\n  thin: 100,\n  hairline: 100,\n  'ultra-light': 100,\n  'extra-light': 100,\n  light: 200,\n  book: 300,\n  regular: 400,\n  normal: 400,\n  plain: 400,\n  roman: 400,\n  standard: 400,\n  medium: 500,\n  'semi-bold': 600,\n  'demi-bold': 600,\n  bold: 700,\n  heavy: 800,\n  black: 800,\n  'extra-bold': 800,\n  'ultra-black': 900,\n  'extra-black': 900,\n  'ultra-bold': 900,\n  'heavy-black': 900,\n  fat: 900,\n  poster: 900\n};\nvar sp = ' ';\nvar italicRE = /(italic|oblique)$/i;\n\nvar fontCache = {};\n\nmodule.exports = function(fonts, size) {\n  var cssData = fontCache[fonts];\n  if (!cssData) {\n    if (!Array.isArray(fonts)) {\n      fonts = [fonts];\n    }\n    var weight = 'normal';\n    var style = 'normal';\n    var fontFamilies = []\n    var haveWeight, haveStyle;\n    for (var i = 0, ii = fonts.length; i < ii; ++i) {\n      var font = fonts[i];\n      var parts = font.split(' ');\n      var maybeWeight = parts[parts.length - 1].toLowerCase();\n      if (maybeWeight == 'normal' || maybeWeight == 'italic' || maybeWeight == 'oblique') {\n        style = haveStyle ? style : maybeWeight;\n        parts.pop();\n        maybeWeight = parts[parts.length - 1].toLowerCase();\n      } else if (italicRE.test(maybeWeight)) {\n        maybeWeight = maybeWeight.replace(italicRE, '');\n        style = haveStyle ? style : parts[parts.length - 1].replace(maybeWeight, '');\n      }\n      for (var w in fontWeights) {\n        if (maybeWeight == w || maybeWeight == w.replace('-', '') || maybeWeight == w.replace('-', sp)) {\n          weight = haveWeight ? weight : fontWeights[w];\n          parts.pop();\n          break;\n        }\n      }\n      if (!haveWeight && typeof maybeWeight == 'number') {\n        weight = maybeWeight;\n      }\n      var fontFamily = parts.join(sp)\n          .replace('Klokantech Noto Sans', 'Noto Sans');\n      if (fontFamily.indexOf(sp) !== -1) {\n        fontFamily = '\"' + fontFamily + '\"';\n      }\n      fontFamilies.push(fontFamily);\n    }\n    // CSS font property: font-style font-weight font-size font-family\n    cssData = fontCache[fonts] = [style, weight, fontFamilies];\n  }\n  return cssData[0] + sp + cssData[1] + sp + size + 'px' + sp + cssData[2];\n}\n","/**\n * @module ol/AssertionError\n */\nimport {VERSION} from './util.js';\n\n/**\n * Error object thrown when an assertion failed. This is an ECMA-262 Error,\n * extended with a `code` property.\n * See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error.\n */\nclass AssertionError extends Error {\n\n  /**\n   * @param {number} code Error code.\n   */\n  constructor(code) {\n    const path = VERSION.split('-')[0];\n    const message = 'Assertion failed. See https://openlayers.org/en/' + path +\n    '/doc/errors/#' + code + ' for details.';\n\n    super(message);\n\n    /**\n     * Error code. The meaning of the code can be found on\n     * https://openlayers.org/en/latest/doc/errors/ (replace `latest` with\n     * the version found in the OpenLayers script's header comment if a version\n     * other than the latest is used).\n     * @type {number}\n     * @api\n     */\n    this.code = code;\n\n    /**\n     * @type {string}\n     */\n    this.name = 'AssertionError';\n\n    // Re-assign message, see https://github.com/Rich-Harris/buble/issues/40\n    this.message = message;\n  }\n\n}\n\nexport default AssertionError;\n","/**\n * @module ol/structs/LRUCache\n */\n\nimport {assert} from '../asserts.js';\nimport EventTarget from '../events/Target.js';\nimport EventType from '../events/EventType.js';\n\n\n/**\n * @typedef {Object} Entry\n * @property {string} key_\n * @property {Object} newer\n * @property {Object} older\n * @property {*} value_\n */\n\n\n/**\n * @classdesc\n * Implements a Least-Recently-Used cache where the keys do not conflict with\n * Object's properties (e.g. 'hasOwnProperty' is not allowed as a key). Expiring\n * items from the cache is the responsibility of the user.\n *\n * @fires module:ol/events/Event~Event\n * @template T\n */\nclass LRUCache extends EventTarget {\n\n  /**\n   * @param {number=} opt_highWaterMark High water mark.\n   */\n  constructor(opt_highWaterMark) {\n\n    super();\n\n    /**\n     * @type {number}\n     */\n    this.highWaterMark = opt_highWaterMark !== undefined ? opt_highWaterMark : 2048;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.count_ = 0;\n\n    /**\n     * @private\n     * @type {!Object<string, module:ol/structs/LRUCache~Entry>}\n     */\n    this.entries_ = {};\n\n    /**\n     * @private\n     * @type {?module:ol/structs/LRUCache~Entry}\n     */\n    this.oldest_ = null;\n\n    /**\n     * @private\n     * @type {?module:ol/structs/LRUCache~Entry}\n     */\n    this.newest_ = null;\n\n  }\n\n\n  /**\n   * @return {boolean} Can expire cache.\n   */\n  canExpireCache() {\n    return this.getCount() > this.highWaterMark;\n  }\n\n\n  /**\n   * FIXME empty description for jsdoc\n   */\n  clear() {\n    this.count_ = 0;\n    this.entries_ = {};\n    this.oldest_ = null;\n    this.newest_ = null;\n    this.dispatchEvent(EventType.CLEAR);\n  }\n\n\n  /**\n   * @param {string} key Key.\n   * @return {boolean} Contains key.\n   */\n  containsKey(key) {\n    return this.entries_.hasOwnProperty(key);\n  }\n\n\n  /**\n   * @param {function(this: S, T, string, module:ol/structs/LRUCache): ?} f The function\n   *     to call for every entry from the oldest to the newer. This function takes\n   *     3 arguments (the entry value, the entry key and the LRUCache object).\n   *     The return value is ignored.\n   * @param {S=} opt_this The object to use as `this` in `f`.\n   * @template S\n   */\n  forEach(f, opt_this) {\n    let entry = this.oldest_;\n    while (entry) {\n      f.call(opt_this, entry.value_, entry.key_, this);\n      entry = entry.newer;\n    }\n  }\n\n\n  /**\n   * @param {string} key Key.\n   * @return {T} Value.\n   */\n  get(key) {\n    const entry = this.entries_[key];\n    assert(entry !== undefined,\n      15); // Tried to get a value for a key that does not exist in the cache\n    if (entry === this.newest_) {\n      return entry.value_;\n    } else if (entry === this.oldest_) {\n      this.oldest_ = /** @type {module:ol/structs/LRUCache~Entry} */ (this.oldest_.newer);\n      this.oldest_.older = null;\n    } else {\n      entry.newer.older = entry.older;\n      entry.older.newer = entry.newer;\n    }\n    entry.newer = null;\n    entry.older = this.newest_;\n    this.newest_.newer = entry;\n    this.newest_ = entry;\n    return entry.value_;\n  }\n\n\n  /**\n   * Remove an entry from the cache.\n   * @param {string} key The entry key.\n   * @return {T} The removed entry.\n   */\n  remove(key) {\n    const entry = this.entries_[key];\n    assert(entry !== undefined, 15); // Tried to get a value for a key that does not exist in the cache\n    if (entry === this.newest_) {\n      this.newest_ = /** @type {module:ol/structs/LRUCache~Entry} */ (entry.older);\n      if (this.newest_) {\n        this.newest_.newer = null;\n      }\n    } else if (entry === this.oldest_) {\n      this.oldest_ = /** @type {module:ol/structs/LRUCache~Entry} */ (entry.newer);\n      if (this.oldest_) {\n        this.oldest_.older = null;\n      }\n    } else {\n      entry.newer.older = entry.older;\n      entry.older.newer = entry.newer;\n    }\n    delete this.entries_[key];\n    --this.count_;\n    return entry.value_;\n  }\n\n\n  /**\n   * @return {number} Count.\n   */\n  getCount() {\n    return this.count_;\n  }\n\n\n  /**\n   * @return {Array<string>} Keys.\n   */\n  getKeys() {\n    const keys = new Array(this.count_);\n    let i = 0;\n    let entry;\n    for (entry = this.newest_; entry; entry = entry.older) {\n      keys[i++] = entry.key_;\n    }\n    return keys;\n  }\n\n\n  /**\n   * @return {Array<T>} Values.\n   */\n  getValues() {\n    const values = new Array(this.count_);\n    let i = 0;\n    let entry;\n    for (entry = this.newest_; entry; entry = entry.older) {\n      values[i++] = entry.value_;\n    }\n    return values;\n  }\n\n\n  /**\n   * @return {T} Last value.\n   */\n  peekLast() {\n    return this.oldest_.value_;\n  }\n\n\n  /**\n   * @return {string} Last key.\n   */\n  peekLastKey() {\n    return this.oldest_.key_;\n  }\n\n\n  /**\n   * Get the key of the newest item in the cache.  Throws if the cache is empty.\n   * @return {string} The newest key.\n   */\n  peekFirstKey() {\n    return this.newest_.key_;\n  }\n\n\n  /**\n   * @return {T} value Value.\n   */\n  pop() {\n    const entry = this.oldest_;\n    delete this.entries_[entry.key_];\n    if (entry.newer) {\n      entry.newer.older = null;\n    }\n    this.oldest_ = /** @type {module:ol/structs/LRUCache~Entry} */ (entry.newer);\n    if (!this.oldest_) {\n      this.newest_ = null;\n    }\n    --this.count_;\n    return entry.value_;\n  }\n\n\n  /**\n   * @param {string} key Key.\n   * @param {T} value Value.\n   */\n  replace(key, value) {\n    this.get(key); // update `newest_`\n    this.entries_[key].value_ = value;\n  }\n\n\n  /**\n   * @param {string} key Key.\n   * @param {T} value Value.\n   */\n  set(key, value) {\n    assert(!(key in this.entries_),\n      16); // Tried to set a value for a key that is used already\n    const entry = /** @type {module:ol/structs/LRUCache~Entry} */ ({\n      key_: key,\n      newer: null,\n      older: this.newest_,\n      value_: value\n    });\n    if (!this.newest_) {\n      this.oldest_ = entry;\n    } else {\n      this.newest_.newer = entry;\n    }\n    this.newest_ = entry;\n    this.entries_[key] = entry;\n    ++this.count_;\n  }\n\n\n  /**\n   * Set a maximum number of entries for the cache.\n   * @param {number} size Cache size.\n   * @api\n   */\n  setSize(size) {\n    this.highWaterMark = size;\n  }\n\n\n  /**\n   * Prune the cache.\n   */\n  prune() {\n    while (this.canExpireCache()) {\n      this.pop();\n    }\n  }\n\n}\n\nexport default LRUCache;\n","/**\n * @module ol/style/Image\n */\n\n\n/**\n * @typedef {Object} Options\n * @property {number} opacity\n * @property {boolean} rotateWithView\n * @property {number} rotation\n * @property {number} scale\n */\n\n\n/**\n * @classdesc\n * A base class used for creating subclasses and not instantiated in\n * apps. Base class for {@link module:ol/style/Icon~Icon}, {@link module:ol/style/Circle~CircleStyle} and\n * {@link module:ol/style/RegularShape~RegularShape}.\n * @api\n */\nclass ImageStyle {\n  /**\n   * @param {module:ol/style/Image~Options} options Options.\n   */\n  constructor(options) {\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.opacity_ = options.opacity;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.rotateWithView_ = options.rotateWithView;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.rotation_ = options.rotation;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.scale_ = options.scale;\n\n  }\n\n  /**\n   * Get the symbolizer opacity.\n   * @return {number} Opacity.\n   * @api\n   */\n  getOpacity() {\n    return this.opacity_;\n  }\n\n  /**\n   * Determine whether the symbolizer rotates with the map.\n   * @return {boolean} Rotate with map.\n   * @api\n   */\n  getRotateWithView() {\n    return this.rotateWithView_;\n  }\n\n  /**\n   * Get the symoblizer rotation.\n   * @return {number} Rotation.\n   * @api\n   */\n  getRotation() {\n    return this.rotation_;\n  }\n\n  /**\n   * Get the symbolizer scale.\n   * @return {number} Scale.\n   * @api\n   */\n  getScale() {\n    return this.scale_;\n  }\n\n  /**\n   * This method is deprecated and always returns false.\n   * @return {boolean} false.\n   * @deprecated\n   * @api\n   */\n  getSnapToPixel() {\n    return false;\n  }\n\n  /**\n   * Get the anchor point in pixels. The anchor determines the center point for the\n   * symbolizer.\n   * @abstract\n   * @return {Array<number>} Anchor.\n   */\n  getAnchor() {}\n\n  /**\n   * Get the image element for the symbolizer.\n   * @abstract\n   * @param {number} pixelRatio Pixel ratio.\n   * @return {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement} Image element.\n   */\n  getImage(pixelRatio) {}\n\n  /**\n   * @abstract\n   * @param {number} pixelRatio Pixel ratio.\n   * @return {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement} Image element.\n   */\n  getHitDetectionImage(pixelRatio) {}\n\n  /**\n   * @abstract\n   * @return {module:ol/ImageState} Image state.\n   */\n  getImageState() {}\n\n  /**\n   * @abstract\n   * @return {module:ol/size~Size} Image size.\n   */\n  getImageSize() {}\n\n  /**\n   * @abstract\n   * @return {module:ol/size~Size} Size of the hit-detection image.\n   */\n  getHitDetectionImageSize() {}\n\n  /**\n   * Get the origin of the symbolizer.\n   * @abstract\n   * @return {Array<number>} Origin.\n   */\n  getOrigin() {}\n\n  /**\n   * Get the size of the symbolizer (in pixels).\n   * @abstract\n   * @return {module:ol/size~Size} Size.\n   */\n  getSize() {}\n\n  /**\n   * Set the opacity.\n   *\n   * @param {number} opacity Opacity.\n   * @api\n   */\n  setOpacity(opacity) {\n    this.opacity_ = opacity;\n  }\n\n  /**\n   * Set whether to rotate the style with the view.\n   *\n   * @param {boolean} rotateWithView Rotate with map.\n   * @api\n   */\n  setRotateWithView(rotateWithView) {\n    this.rotateWithView_ = rotateWithView;\n  }\n\n  /**\n   * Set the rotation.\n   *\n   * @param {number} rotation Rotation.\n   * @api\n   */\n  setRotation(rotation) {\n    this.rotation_ = rotation;\n  }\n  /**\n   * Set the scale.\n   *\n   * @param {number} scale Scale.\n   * @api\n   */\n  setScale(scale) {\n    this.scale_ = scale;\n  }\n\n  /**\n   * This method is deprecated and does nothing.\n   * @param {boolean} snapToPixel Snap to pixel?\n   * @deprecated\n   * @api\n   */\n  setSnapToPixel(snapToPixel) {}\n\n  /**\n   * @abstract\n   * @param {function(this: T, module:ol/events/Event)} listener Listener function.\n   * @param {T} thisArg Value to use as `this` when executing `listener`.\n   * @return {module:ol/events~EventsKey|undefined} Listener key.\n   * @template T\n   */\n  listenImageChange(listener, thisArg) {}\n\n  /**\n   * Load not yet loaded URI.\n   * @abstract\n   */\n  load() {}\n\n  /**\n   * @abstract\n   * @param {function(this: T, module:ol/events/Event)} listener Listener function.\n   * @param {T} thisArg Value to use as `this` when executing `listener`.\n   * @template T\n   */\n  unlistenImageChange(listener, thisArg) {}\n}\n\nexport default ImageStyle;\n","/**\n * @module ol/style/TextPlacement\n */\n\n/**\n * Text placement. One of `'point'`, `'line'`. Default is `'point'`. Note that\n * `'line'` requires the underlying geometry to be a {@link module:ol/geom/LineString~LineString},\n * {@link module:ol/geom/Polygon~Polygon}, {@link module:ol/geom/MultiLineString~MultiLineString} or\n * {@link module:ol/geom/MultiPolygon~MultiPolygon}.\n * @enum {string}\n */\nexport default {\n  POINT: 'point',\n  LINE: 'line'\n};\n","/**\n * @module ol/layer/VectorRenderType\n */\n\n/**\n * @enum {string}\n * Render mode for vector layers:\n *  * `'image'`: Vector layers are rendered as images. Great performance, but\n *    point symbols and texts are always rotated with the view and pixels are\n *    scaled during zoom animations.\n *  * `'vector'`: Vector layers are rendered as vectors. Most accurate rendering\n *    even during animations, but slower performance.\n * @api\n */\nexport default {\n  IMAGE: 'image',\n  VECTOR: 'vector'\n};\n","/**\n * @module ol/layer/Base\n */\nimport BaseObject from '../Object.js';\nimport LayerProperty from '../layer/Property.js';\nimport {clamp} from '../math.js';\nimport {assign} from '../obj.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [opacity=1] Opacity (0, 1).\n * @property {boolean} [visible=true] Visibility.\n * @property {module:ol/extent~Extent} [extent] The bounding extent for layer rendering.  The layer will not be\n * rendered outside of this extent.\n * @property {number} [zIndex] The z-index for layer rendering.  At rendering time, the layers\n * will be ordered, first by Z-index and then by position. When `undefined`, a `zIndex` of 0 is assumed\n * for layers that are added to the map's `layers` collection, or `Infinity` when the layer's `setMap()`\n * method was used.\n * @property {number} [minResolution] The minimum resolution (inclusive) at which this layer will be\n * visible.\n * @property {number} [maxResolution] The maximum resolution (exclusive) below which this layer will\n * be visible.\n */\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * Note that with {@link module:ol/layer/Base} and all its subclasses, any property set in\n * the options is set as a {@link module:ol/Object} property on the layer object, so\n * is observable, and has get/set accessors.\n *\n * @api\n */\nclass BaseLayer extends BaseObject {\n  /**\n   * @param {module:ol/layer/Base~Options} options Layer options.\n   */\n  constructor(options) {\n\n    super();\n\n    /**\n    * @type {Object<string, *>}\n    */\n    const properties = assign({}, options);\n    properties[LayerProperty.OPACITY] =\n       options.opacity !== undefined ? options.opacity : 1;\n    properties[LayerProperty.VISIBLE] =\n       options.visible !== undefined ? options.visible : true;\n    properties[LayerProperty.Z_INDEX] = options.zIndex;\n    properties[LayerProperty.MAX_RESOLUTION] =\n       options.maxResolution !== undefined ? options.maxResolution : Infinity;\n    properties[LayerProperty.MIN_RESOLUTION] =\n       options.minResolution !== undefined ? options.minResolution : 0;\n\n    this.setProperties(properties);\n\n    /**\n    * @type {module:ol/layer/Layer~State}\n    * @private\n    */\n    this.state_ = /** @type {module:ol/layer/Layer~State} */ ({\n      layer: /** @type {module:ol/layer/Layer} */ (this),\n      managed: true\n    });\n\n    /**\n    * The layer type.\n    * @type {module:ol/LayerType}\n    * @protected;\n    */\n    this.type;\n\n  }\n\n  /**\n  * Get the layer type (used when creating a layer renderer).\n  * @return {module:ol/LayerType} The layer type.\n  */\n  getType() {\n    return this.type;\n  }\n\n  /**\n  * @return {module:ol/layer/Layer~State} Layer state.\n  */\n  getLayerState() {\n    this.state_.opacity = clamp(this.getOpacity(), 0, 1);\n    this.state_.sourceState = this.getSourceState();\n    this.state_.visible = this.getVisible();\n    this.state_.extent = this.getExtent();\n    this.state_.zIndex = this.getZIndex() || 0;\n    this.state_.maxResolution = this.getMaxResolution();\n    this.state_.minResolution = Math.max(this.getMinResolution(), 0);\n\n    return this.state_;\n  }\n\n  /**\n  * @abstract\n  * @param {Array<module:ol/layer/Layer>=} opt_array Array of layers (to be\n  *     modified in place).\n  * @return {Array<module:ol/layer/Layer>} Array of layers.\n  */\n  getLayersArray(opt_array) {}\n\n  /**\n  * @abstract\n  * @param {Array<module:ol/layer/Layer~State>=} opt_states Optional list of layer\n  *     states (to be modified in place).\n  * @return {Array<module:ol/layer/Layer~State>} List of layer states.\n  */\n  getLayerStatesArray(opt_states) {}\n\n  /**\n  * Return the {@link module:ol/extent~Extent extent} of the layer or `undefined` if it\n  * will be visible regardless of extent.\n  * @return {module:ol/extent~Extent|undefined} The layer extent.\n  * @observable\n  * @api\n  */\n  getExtent() {\n    return (\n    /** @type {module:ol/extent~Extent|undefined} */ (this.get(LayerProperty.EXTENT))\n    );\n  }\n\n  /**\n  * Return the maximum resolution of the layer.\n  * @return {number} The maximum resolution of the layer.\n  * @observable\n  * @api\n  */\n  getMaxResolution() {\n    return /** @type {number} */ (this.get(LayerProperty.MAX_RESOLUTION));\n  }\n\n  /**\n  * Return the minimum resolution of the layer.\n  * @return {number} The minimum resolution of the layer.\n  * @observable\n  * @api\n  */\n  getMinResolution() {\n    return /** @type {number} */ (this.get(LayerProperty.MIN_RESOLUTION));\n  }\n\n  /**\n  * Return the opacity of the layer (between 0 and 1).\n  * @return {number} The opacity of the layer.\n  * @observable\n  * @api\n  */\n  getOpacity() {\n    return /** @type {number} */ (this.get(LayerProperty.OPACITY));\n  }\n\n  /**\n  * @abstract\n  * @return {module:ol/source/State} Source state.\n  */\n  getSourceState() {}\n\n  /**\n  * Return the visibility of the layer (`true` or `false`).\n  * @return {boolean} The visibility of the layer.\n  * @observable\n  * @api\n  */\n  getVisible() {\n    return /** @type {boolean} */ (this.get(LayerProperty.VISIBLE));\n  }\n\n  /**\n  * Return the Z-index of the layer, which is used to order layers before\n  * rendering. The default Z-index is 0.\n  * @return {number} The Z-index of the layer.\n  * @observable\n  * @api\n  */\n  getZIndex() {\n    return /** @type {number} */ (this.get(LayerProperty.Z_INDEX));\n  }\n\n  /**\n  * Set the extent at which the layer is visible.  If `undefined`, the layer\n  * will be visible at all extents.\n  * @param {module:ol/extent~Extent|undefined} extent The extent of the layer.\n  * @observable\n  * @api\n  */\n  setExtent(extent) {\n    this.set(LayerProperty.EXTENT, extent);\n  }\n\n  /**\n  * Set the maximum resolution at which the layer is visible.\n  * @param {number} maxResolution The maximum resolution of the layer.\n  * @observable\n  * @api\n  */\n  setMaxResolution(maxResolution) {\n    this.set(LayerProperty.MAX_RESOLUTION, maxResolution);\n  }\n\n  /**\n  * Set the minimum resolution at which the layer is visible.\n  * @param {number} minResolution The minimum resolution of the layer.\n  * @observable\n  * @api\n  */\n  setMinResolution(minResolution) {\n    this.set(LayerProperty.MIN_RESOLUTION, minResolution);\n  }\n\n  /**\n  * Set the opacity of the layer, allowed values range from 0 to 1.\n  * @param {number} opacity The opacity of the layer.\n  * @observable\n  * @api\n  */\n  setOpacity(opacity) {\n    this.set(LayerProperty.OPACITY, opacity);\n  }\n\n  /**\n  * Set the visibility of the layer (`true` or `false`).\n  * @param {boolean} visible The visibility of the layer.\n  * @observable\n  * @api\n  */\n  setVisible(visible) {\n    this.set(LayerProperty.VISIBLE, visible);\n  }\n\n  /**\n  * Set Z-index of the layer, which is used to order layers before rendering.\n  * The default Z-index is 0.\n  * @param {number} zindex The z-index of the layer.\n  * @observable\n  * @api\n  */\n  setZIndex(zindex) {\n    this.set(LayerProperty.Z_INDEX, zindex);\n  }\n}\n\n\nexport default BaseLayer;\n","/**\n * @module ol/featureloader\n */\nimport {VOID} from './functions.js';\nimport FormatType from './format/FormatType.js';\n\n\n/**\n * {@link module:ol/source/Vector} sources use a function of this type to\n * load features.\n *\n * This function takes an {@link module:ol/extent~Extent} representing the area to be loaded,\n * a `{number}` representing the resolution (map units per pixel) and an\n * {@link module:ol/proj/Projection} for the projection  as\n * arguments. `this` within the function is bound to the\n * {@link module:ol/source/Vector} it's called from.\n *\n * The function is responsible for loading the features and adding them to the\n * source.\n * @typedef {function(this:module:ol/source/Vector, module:ol/extent~Extent, number,\n *                    module:ol/proj/Projection)} FeatureLoader\n * @api\n */\n\n\n/**\n * {@link module:ol/source/Vector} sources use a function of this type to\n * get the url to load features from.\n *\n * This function takes an {@link module:ol/extent~Extent} representing the area\n * to be loaded, a `{number}` representing the resolution (map units per pixel)\n * and an {@link module:ol/proj/Projection} for the projection  as\n * arguments and returns a `{string}` representing the URL.\n * @typedef {function(module:ol/extent~Extent, number, module:ol/proj/Projection): string} FeatureUrlFunction\n * @api\n */\n\n\n/**\n * @param {string|module:ol/featureloader~FeatureUrlFunction} url Feature URL service.\n * @param {module:ol/format/Feature} format Feature format.\n * @param {function(this:module:ol/VectorTile, Array<module:ol/Feature>, module:ol/proj/Projection, module:ol/extent~Extent)|function(this:module:ol/source/Vector, Array<module:ol/Feature>)} success\n *     Function called with the loaded features and optionally with the data\n *     projection. Called with the vector tile or source as `this`.\n * @param {function(this:module:ol/VectorTile)|function(this:module:ol/source/Vector)} failure\n *     Function called when loading failed. Called with the vector tile or\n *     source as `this`.\n * @return {module:ol/featureloader~FeatureLoader} The feature loader.\n */\nexport function loadFeaturesXhr(url, format, success, failure) {\n  return (\n    /**\n     * @param {module:ol/extent~Extent} extent Extent.\n     * @param {number} resolution Resolution.\n     * @param {module:ol/proj/Projection} projection Projection.\n     * @this {module:ol/source/Vector|module:ol/VectorTile}\n     */\n    function(extent, resolution, projection) {\n      const xhr = new XMLHttpRequest();\n      xhr.open('GET',\n        typeof url === 'function' ? url(extent, resolution, projection) : url,\n        true);\n      if (format.getType() == FormatType.ARRAY_BUFFER) {\n        xhr.responseType = 'arraybuffer';\n      }\n      /**\n       * @param {Event} event Event.\n       * @private\n       */\n      xhr.onload = function(event) {\n        // status will be 0 for file:// urls\n        if (!xhr.status || xhr.status >= 200 && xhr.status < 300) {\n          const type = format.getType();\n          /** @type {Document|Node|Object|string|undefined} */\n          let source;\n          if (type == FormatType.JSON || type == FormatType.TEXT) {\n            source = xhr.responseText;\n          } else if (type == FormatType.XML) {\n            source = xhr.responseXML;\n            if (!source) {\n              source = new DOMParser().parseFromString(xhr.responseText, 'application/xml');\n            }\n          } else if (type == FormatType.ARRAY_BUFFER) {\n            source = /** @type {ArrayBuffer} */ (xhr.response);\n          }\n          if (source) {\n            success.call(this, format.readFeatures(source,\n              {featureProjection: projection}),\n            format.readProjection(source), format.getLastExtent());\n          } else {\n            failure.call(this);\n          }\n        } else {\n          failure.call(this);\n        }\n      }.bind(this);\n      /**\n       * @private\n       */\n      xhr.onerror = function() {\n        failure.call(this);\n      }.bind(this);\n      xhr.send();\n    }\n  );\n}\n\n\n/**\n * Create an XHR feature loader for a `url` and `format`. The feature loader\n * loads features (with XHR), parses the features, and adds them to the\n * vector source.\n * @param {string|module:ol/featureloader~FeatureUrlFunction} url Feature URL service.\n * @param {module:ol/format/Feature} format Feature format.\n * @return {module:ol/featureloader~FeatureLoader} The feature loader.\n * @api\n */\nexport function xhr(url, format) {\n  return loadFeaturesXhr(url, format,\n    /**\n     * @param {Array<module:ol/Feature>} features The loaded features.\n     * @param {module:ol/proj/Projection} dataProjection Data\n     * projection.\n     * @this {module:ol/source/Vector}\n     */\n    function(features, dataProjection) {\n      this.addFeatures(features);\n    }, /* FIXME handle error */ VOID);\n}\n","/**\n * @module ol/source/Source\n */\n\nimport {VOID} from '../functions.js';\nimport BaseObject from '../Object.js';\nimport {get as getProjection} from '../proj.js';\nimport SourceState from '../source/State.js';\n\n\n/**\n * A function that returns a string or an array of strings representing source\n * attributions.\n *\n * @typedef {function(module:ol/PluggableMap~FrameState): (string|Array<string>)} Attribution\n */\n\n\n/**\n * A type that can be used to provide attribution information for data sources.\n *\n * It represents either\n * * a simple string (e.g. `'© Acme Inc.'`)\n * * an array of simple strings (e.g. `['© Acme Inc.', '© Bacme Inc.']`)\n * * a function that returns a string or array of strings (`{@link module:ol/source/Source~Attribution}`)\n *\n * @typedef {string|Array<string>|module:ol/source/Source~Attribution} AttributionLike\n */\n\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/source/Source~AttributionLike} [attributions]\n * @property {module:ol/proj~ProjectionLike} projection\n * @property {module:ol/source/State} [state]\n * @property {boolean} [wrapX]\n */\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * Base class for {@link module:ol/layer/Layer~Layer} sources.\n *\n * A generic `change` event is triggered when the state of the source changes.\n * @api\n */\nclass Source extends BaseObject {\n  /**\n   * @param {module:ol/source/Source~Options} options Source options.\n   */\n  constructor(options) {\n\n    super();\n\n    /**\n    * @private\n    * @type {module:ol/proj/Projection}\n    */\n    this.projection_ = getProjection(options.projection);\n\n    /**\n    * @private\n    * @type {?module:ol/source/Source~Attribution}\n    */\n    this.attributions_ = this.adaptAttributions_(options.attributions);\n\n    /**\n     * This source is currently loading data. Sources that defer loading to the\n     * map's tile queue never set this to `true`.\n     * @type {boolean}\n     */\n    this.loading = false;\n\n    /**\n    * @private\n    * @type {module:ol/source/State}\n    */\n    this.state_ = options.state !== undefined ?\n      options.state : SourceState.READY;\n\n    /**\n    * @private\n    * @type {boolean}\n    */\n    this.wrapX_ = options.wrapX !== undefined ? options.wrapX : false;\n\n  }\n\n  /**\n  * Turns the attributions option into an attributions function.\n  * @param {module:ol/source/Source~AttributionLike|undefined} attributionLike The attribution option.\n  * @return {?module:ol/source/Source~Attribution} An attribution function (or null).\n  */\n  adaptAttributions_(attributionLike) {\n    if (!attributionLike) {\n      return null;\n    }\n    if (Array.isArray(attributionLike)) {\n      return function(frameState) {\n        return attributionLike;\n      };\n    }\n\n    if (typeof attributionLike === 'function') {\n      return attributionLike;\n    }\n\n    return function(frameState) {\n      return [attributionLike];\n    };\n  }\n\n  /**\n  * Get the attribution function for the source.\n  * @return {?module:ol/source/Source~Attribution} Attribution function.\n  */\n  getAttributions() {\n    return this.attributions_;\n  }\n\n  /**\n  * Get the projection of the source.\n  * @return {module:ol/proj/Projection} Projection.\n  * @api\n  */\n  getProjection() {\n    return this.projection_;\n  }\n\n  /**\n  * @abstract\n  * @return {Array<number>|undefined} Resolutions.\n  */\n  getResolutions() {}\n\n  /**\n  * Get the state of the source, see {@link module:ol/source/State~State} for possible states.\n  * @return {module:ol/source/State} State.\n  * @api\n  */\n  getState() {\n    return this.state_;\n  }\n\n  /**\n  * @return {boolean|undefined} Wrap X.\n  */\n  getWrapX() {\n    return this.wrapX_;\n  }\n\n  /**\n  * Refreshes the source and finally dispatches a 'change' event.\n  * @api\n  */\n  refresh() {\n    this.changed();\n  }\n\n  /**\n  * Set the attributions of the source.\n  * @param {module:ol/source/Source~AttributionLike|undefined} attributions Attributions.\n  *     Can be passed as `string`, `Array<string>`, `{@link module:ol/source/Source~Attribution}`,\n  *     or `undefined`.\n  * @api\n  */\n  setAttributions(attributions) {\n    this.attributions_ = this.adaptAttributions_(attributions);\n    this.changed();\n  }\n\n  /**\n  * Set the state of the source.\n  * @param {module:ol/source/State} state State.\n  * @protected\n  */\n  setState(state) {\n    this.state_ = state;\n    this.changed();\n  }\n}\n\n/**\n * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n * @param {number} resolution Resolution.\n * @param {number} rotation Rotation.\n * @param {number} hitTolerance Hit tolerance in pixels.\n * @param {Object<string, boolean>} skippedFeatureUids Skipped feature uids.\n * @param {function((module:ol/Feature|module:ol/render/Feature)): T} callback Feature callback.\n * @return {T|void} Callback result.\n * @template T\n */\nSource.prototype.forEachFeatureAtCoordinate = VOID;\n\n\nexport default Source;\n","/**\n * @module ol/geom/flat/center\n */\nimport {createEmpty, createOrUpdateFromFlatCoordinates} from '../../extent.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @return {Array<number>} Flat centers.\n */\nexport function linearRingss(flatCoordinates, offset, endss, stride) {\n  const flatCenters = [];\n  let extent = createEmpty();\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    extent = createOrUpdateFromFlatCoordinates(flatCoordinates, offset, ends[0], stride);\n    flatCenters.push((extent[0] + extent[2]) / 2, (extent[1] + extent[3]) / 2);\n    offset = ends[ends.length - 1];\n  }\n  return flatCenters;\n}\n","/**\n * @module ol/geom/MultiPolygon\n */\nimport {extend} from '../array.js';\nimport {closestSquaredDistanceXY} from '../extent.js';\nimport GeometryLayout from '../geom/GeometryLayout.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport MultiPoint from '../geom/MultiPoint.js';\nimport Polygon from '../geom/Polygon.js';\nimport SimpleGeometry from '../geom/SimpleGeometry.js';\nimport {linearRingss as linearRingssArea} from '../geom/flat/area.js';\nimport {linearRingss as linearRingssCenter} from '../geom/flat/center.js';\nimport {assignClosestMultiArrayPoint, multiArrayMaxSquaredDelta} from '../geom/flat/closest.js';\nimport {linearRingssContainsXY} from '../geom/flat/contains.js';\nimport {deflateMultiCoordinatesArray} from '../geom/flat/deflate.js';\nimport {inflateMultiCoordinatesArray} from '../geom/flat/inflate.js';\nimport {getInteriorPointsOfMultiArray} from '../geom/flat/interiorpoint.js';\nimport {intersectsLinearRingMultiArray} from '../geom/flat/intersectsextent.js';\nimport {linearRingsAreOriented, orientLinearRingsArray} from '../geom/flat/orient.js';\nimport {quantizeMultiArray} from '../geom/flat/simplify.js';\n\n/**\n * @classdesc\n * Multi-polygon geometry.\n *\n * @api\n */\nclass MultiPolygon extends SimpleGeometry {\n\n  /**\n   * @param {Array<Array<Array<module:ol/coordinate~Coordinate>>>|Array<number>} coordinates Coordinates.\n   *     For internal use, flat coordinats in combination with `opt_layout` and `opt_endss` are also accepted.\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   * @param {Array<number>} opt_endss Array of ends for internal use with flat coordinates.\n   */\n  constructor(coordinates, opt_layout, opt_endss) {\n\n    super();\n\n    /**\n     * @type {Array<Array<number>>}\n     * @private\n     */\n    this.endss_ = [];\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.flatInteriorPointsRevision_ = -1;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.flatInteriorPoints_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDelta_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDeltaRevision_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.orientedRevision_ = -1;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.orientedFlatCoordinates_ = null;\n\n    if (!opt_endss && !Array.isArray(coordinates[0])) {\n      let layout = this.getLayout();\n      const flatCoordinates = [];\n      const endss = [];\n      for (let i = 0, ii = coordinates.length; i < ii; ++i) {\n        const polygon = coordinates[i];\n        if (i === 0) {\n          layout = polygon.getLayout();\n        }\n        const offset = flatCoordinates.length;\n        const ends = polygon.getEnds();\n        for (let j = 0, jj = ends.length; j < jj; ++j) {\n          ends[j] += offset;\n        }\n        extend(flatCoordinates, polygon.getFlatCoordinates());\n        endss.push(ends);\n      }\n      opt_layout = layout;\n      coordinates = flatCoordinates;\n      opt_endss = endss;\n    }\n    if (opt_layout !== undefined && opt_endss) {\n      this.setFlatCoordinates(opt_layout, coordinates);\n      this.endss_ = opt_endss;\n    } else {\n      this.setCoordinates(coordinates, opt_layout);\n    }\n\n  }\n\n  /**\n   * Append the passed polygon to this multipolygon.\n   * @param {module:ol/geom/Polygon} polygon Polygon.\n   * @api\n   */\n  appendPolygon(polygon) {\n    /** @type {Array<number>} */\n    let ends;\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = polygon.getFlatCoordinates().slice();\n      ends = polygon.getEnds().slice();\n      this.endss_.push();\n    } else {\n      const offset = this.flatCoordinates.length;\n      extend(this.flatCoordinates, polygon.getFlatCoordinates());\n      ends = polygon.getEnds().slice();\n      for (let i = 0, ii = ends.length; i < ii; ++i) {\n        ends[i] += offset;\n      }\n    }\n    this.endss_.push(ends);\n    this.changed();\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!module:ol/geom/MultiPolygon} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    const len = this.endss_.length;\n    const newEndss = new Array(len);\n    for (let i = 0; i < len; ++i) {\n      newEndss[i] = this.endss_[i].slice();\n    }\n\n    return new MultiPolygon(\n      this.flatCoordinates.slice(), this.layout, newEndss);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    if (this.maxDeltaRevision_ != this.getRevision()) {\n      this.maxDelta_ = Math.sqrt(multiArrayMaxSquaredDelta(\n        this.flatCoordinates, 0, this.endss_, this.stride, 0));\n      this.maxDeltaRevision_ = this.getRevision();\n    }\n    return assignClosestMultiArrayPoint(\n      this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride,\n      this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  containsXY(x, y) {\n    return linearRingssContainsXY(this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride, x, y);\n  }\n\n  /**\n   * Return the area of the multipolygon on projected plane.\n   * @return {number} Area (on projected plane).\n   * @api\n   */\n  getArea() {\n    return linearRingssArea(this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride);\n  }\n\n  /**\n   * Get the coordinate array for this geometry.  This array has the structure\n   * of a GeoJSON coordinate array for multi-polygons.\n   *\n   * @param {boolean=} opt_right Orient coordinates according to the right-hand\n   *     rule (counter-clockwise for exterior and clockwise for interior rings).\n   *     If `false`, coordinates will be oriented according to the left-hand rule\n   *     (clockwise for exterior and counter-clockwise for interior rings).\n   *     By default, coordinate orientation will depend on how the geometry was\n   *     constructed.\n   * @return {Array<Array<Array<module:ol/coordinate~Coordinate>>>} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates(opt_right) {\n    let flatCoordinates;\n    if (opt_right !== undefined) {\n      flatCoordinates = this.getOrientedFlatCoordinates().slice();\n      orientLinearRingsArray(\n        flatCoordinates, 0, this.endss_, this.stride, opt_right);\n    } else {\n      flatCoordinates = this.flatCoordinates;\n    }\n\n    return inflateMultiCoordinatesArray(\n      flatCoordinates, 0, this.endss_, this.stride);\n  }\n\n  /**\n   * @return {Array<Array<number>>} Endss.\n   */\n  getEndss() {\n    return this.endss_;\n  }\n\n  /**\n   * @return {Array<number>} Flat interior points.\n   */\n  getFlatInteriorPoints() {\n    if (this.flatInteriorPointsRevision_ != this.getRevision()) {\n      const flatCenters = linearRingssCenter(\n        this.flatCoordinates, 0, this.endss_, this.stride);\n      this.flatInteriorPoints_ = getInteriorPointsOfMultiArray(\n        this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride,\n        flatCenters);\n      this.flatInteriorPointsRevision_ = this.getRevision();\n    }\n    return this.flatInteriorPoints_;\n  }\n\n  /**\n   * Return the interior points as {@link module:ol/geom/MultiPoint multipoint}.\n   * @return {module:ol/geom/MultiPoint} Interior points as XYM coordinates, where M is\n   * the length of the horizontal intersection that the point belongs to.\n   * @api\n   */\n  getInteriorPoints() {\n    return new MultiPoint(this.getFlatInteriorPoints().slice(), GeometryLayout.XYM);\n  }\n\n  /**\n   * @return {Array<number>} Oriented flat coordinates.\n   */\n  getOrientedFlatCoordinates() {\n    if (this.orientedRevision_ != this.getRevision()) {\n      const flatCoordinates = this.flatCoordinates;\n      if (linearRingsAreOriented(\n        flatCoordinates, 0, this.endss_, this.stride)) {\n        this.orientedFlatCoordinates_ = flatCoordinates;\n      } else {\n        this.orientedFlatCoordinates_ = flatCoordinates.slice();\n        this.orientedFlatCoordinates_.length =\n            orientLinearRingsArray(\n              this.orientedFlatCoordinates_, 0, this.endss_, this.stride);\n      }\n      this.orientedRevision_ = this.getRevision();\n    }\n    return this.orientedFlatCoordinates_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometryInternal(squaredTolerance) {\n    const simplifiedFlatCoordinates = [];\n    const simplifiedEndss = [];\n    simplifiedFlatCoordinates.length = quantizeMultiArray(\n      this.flatCoordinates, 0, this.endss_, this.stride,\n      Math.sqrt(squaredTolerance),\n      simplifiedFlatCoordinates, 0, simplifiedEndss);\n    return new MultiPolygon(simplifiedFlatCoordinates, GeometryLayout.XY, simplifiedEndss);\n  }\n\n  /**\n   * Return the polygon at the specified index.\n   * @param {number} index Index.\n   * @return {module:ol/geom/Polygon} Polygon.\n   * @api\n   */\n  getPolygon(index) {\n    if (index < 0 || this.endss_.length <= index) {\n      return null;\n    }\n    let offset;\n    if (index === 0) {\n      offset = 0;\n    } else {\n      const prevEnds = this.endss_[index - 1];\n      offset = prevEnds[prevEnds.length - 1];\n    }\n    const ends = this.endss_[index].slice();\n    const end = ends[ends.length - 1];\n    if (offset !== 0) {\n      for (let i = 0, ii = ends.length; i < ii; ++i) {\n        ends[i] -= offset;\n      }\n    }\n    return new Polygon(this.flatCoordinates.slice(offset, end), this.layout, ends);\n  }\n\n  /**\n   * Return the polygons of this multipolygon.\n   * @return {Array<module:ol/geom/Polygon>} Polygons.\n   * @api\n   */\n  getPolygons() {\n    const layout = this.layout;\n    const flatCoordinates = this.flatCoordinates;\n    const endss = this.endss_;\n    const polygons = [];\n    let offset = 0;\n    for (let i = 0, ii = endss.length; i < ii; ++i) {\n      const ends = endss[i].slice();\n      const end = ends[ends.length - 1];\n      if (offset !== 0) {\n        for (let j = 0, jj = ends.length; j < jj; ++j) {\n          ends[j] -= offset;\n        }\n      }\n      const polygon = new Polygon(flatCoordinates.slice(offset, end), layout, ends);\n      polygons.push(polygon);\n      offset = end;\n    }\n    return polygons;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.MULTI_POLYGON;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    return intersectsLinearRingMultiArray(\n      this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride, extent);\n  }\n\n  /**\n   * Set the coordinates of the multipolygon.\n   * @param {!Array<Array<Array<module:ol/coordinate~Coordinate>>>} coordinates Coordinates.\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   * @override\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 3);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    const endss = deflateMultiCoordinatesArray(\n      this.flatCoordinates, 0, coordinates, this.stride, this.endss_);\n    if (endss.length === 0) {\n      this.flatCoordinates.length = 0;\n    } else {\n      const lastEnds = endss[endss.length - 1];\n      this.flatCoordinates.length = lastEnds.length === 0 ?\n        0 : lastEnds[lastEnds.length - 1];\n    }\n    this.changed();\n  }\n}\n\n\nexport default MultiPolygon;\n","/**\n * @module ol/geom/flat/segments\n */\n\n\n/**\n * This function calls `callback` for each segment of the flat coordinates\n * array. If the callback returns a truthy value the function returns that\n * value immediately. Otherwise the function returns `false`.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {function(this: S, module:ol/coordinate~Coordinate, module:ol/coordinate~Coordinate): T} callback Function\n *     called for each segment.\n * @param {S=} opt_this The object to be used as the value of 'this'\n *     within callback.\n * @return {T|boolean} Value.\n * @template T,S\n */\nexport function forEach(flatCoordinates, offset, end, stride, callback, opt_this) {\n  const point1 = [flatCoordinates[offset], flatCoordinates[offset + 1]];\n  const point2 = [];\n  let ret;\n  for (; (offset + stride) < end; offset += stride) {\n    point2[0] = flatCoordinates[offset + stride];\n    point2[1] = flatCoordinates[offset + stride + 1];\n    ret = callback.call(opt_this, point1, point2);\n    if (ret) {\n      return ret;\n    }\n    point1[0] = point2[0];\n    point1[1] = point2[1];\n  }\n  return false;\n}\n","/**\n * @module ol/geom/flat/length\n */\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @return {number} Length.\n */\nexport function lineStringLength(flatCoordinates, offset, end, stride) {\n  let x1 = flatCoordinates[offset];\n  let y1 = flatCoordinates[offset + 1];\n  let length = 0;\n  for (let i = offset + stride; i < end; i += stride) {\n    const x2 = flatCoordinates[i];\n    const y2 = flatCoordinates[i + 1];\n    length += Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));\n    x1 = x2;\n    y1 = y2;\n  }\n  return length;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @return {number} Perimeter.\n */\nexport function linearRingLength(flatCoordinates, offset, end, stride) {\n  let perimeter = lineStringLength(flatCoordinates, offset, end, stride);\n  const dx = flatCoordinates[end - stride] - flatCoordinates[offset];\n  const dy = flatCoordinates[end - stride + 1] - flatCoordinates[offset + 1];\n  perimeter += Math.sqrt(dx * dx + dy * dy);\n  return perimeter;\n}\n","/**\n * @module ol/geom/MultiLineString\n */\nimport {extend} from '../array.js';\nimport {closestSquaredDistanceXY} from '../extent.js';\nimport GeometryLayout from '../geom/GeometryLayout.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport LineString from '../geom/LineString.js';\nimport SimpleGeometry from '../geom/SimpleGeometry.js';\nimport {assignClosestArrayPoint, arrayMaxSquaredDelta} from '../geom/flat/closest.js';\nimport {deflateCoordinatesArray} from '../geom/flat/deflate.js';\nimport {inflateCoordinatesArray} from '../geom/flat/inflate.js';\nimport {interpolatePoint, lineStringsCoordinateAtM} from '../geom/flat/interpolate.js';\nimport {intersectsLineStringArray} from '../geom/flat/intersectsextent.js';\nimport {douglasPeuckerArray} from '../geom/flat/simplify.js';\n\n/**\n * @classdesc\n * Multi-linestring geometry.\n *\n * @api\n */\nclass MultiLineString extends SimpleGeometry {\n\n  /**\n   * @param {Array<Array<module:ol/coordinate~Coordinate>|module:ol/geom~MultiLineString>|Array<number>} coordinates\n   *     Coordinates or LineString geometries. (For internal use, flat coordinates in\n   *     combination with `opt_layout` and `opt_ends` are also accepted.)\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   * @param {Array<number>} opt_ends Flat coordinate ends for internal use.\n   */\n  constructor(coordinates, opt_layout, opt_ends) {\n\n    super();\n\n    /**\n     * @type {Array<number>}\n     * @private\n     */\n    this.ends_ = [];\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDelta_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDeltaRevision_ = -1;\n\n    if (Array.isArray(coordinates[0])) {\n      this.setCoordinates(coordinates, opt_layout);\n    } else if (opt_layout !== undefined && opt_ends) {\n      this.setFlatCoordinates(opt_layout, coordinates);\n      this.ends_ = opt_ends;\n    } else {\n      let layout = this.getLayout();\n      const flatCoordinates = [];\n      const ends = [];\n      for (let i = 0, ii = coordinates.length; i < ii; ++i) {\n        const lineString = coordinates[i];\n        if (i === 0) {\n          layout = lineString.getLayout();\n        }\n        extend(flatCoordinates, lineString.getFlatCoordinates());\n        ends.push(flatCoordinates.length);\n      }\n      this.setFlatCoordinates(layout, flatCoordinates);\n      this.ends_ = ends;\n    }\n\n  }\n\n  /**\n   * Append the passed linestring to the multilinestring.\n   * @param {module:ol/geom/LineString} lineString LineString.\n   * @api\n   */\n  appendLineString(lineString) {\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = lineString.getFlatCoordinates().slice();\n    } else {\n      extend(this.flatCoordinates, lineString.getFlatCoordinates().slice());\n    }\n    this.ends_.push(this.flatCoordinates.length);\n    this.changed();\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!module:ol/geom/MultiLineString} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    return new MultiLineString(this.flatCoordinates.slice(), this.layout, this.ends_.slice());\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    if (this.maxDeltaRevision_ != this.getRevision()) {\n      this.maxDelta_ = Math.sqrt(arrayMaxSquaredDelta(\n        this.flatCoordinates, 0, this.ends_, this.stride, 0));\n      this.maxDeltaRevision_ = this.getRevision();\n    }\n    return assignClosestArrayPoint(\n      this.flatCoordinates, 0, this.ends_, this.stride,\n      this.maxDelta_, false, x, y, closestPoint, minSquaredDistance);\n  }\n\n  /**\n   * Returns the coordinate at `m` using linear interpolation, or `null` if no\n   * such coordinate exists.\n   *\n   * `opt_extrapolate` controls extrapolation beyond the range of Ms in the\n   * MultiLineString. If `opt_extrapolate` is `true` then Ms less than the first\n   * M will return the first coordinate and Ms greater than the last M will\n   * return the last coordinate.\n   *\n   * `opt_interpolate` controls interpolation between consecutive LineStrings\n   * within the MultiLineString. If `opt_interpolate` is `true` the coordinates\n   * will be linearly interpolated between the last coordinate of one LineString\n   * and the first coordinate of the next LineString.  If `opt_interpolate` is\n   * `false` then the function will return `null` for Ms falling between\n   * LineStrings.\n   *\n   * @param {number} m M.\n   * @param {boolean=} opt_extrapolate Extrapolate. Default is `false`.\n   * @param {boolean=} opt_interpolate Interpolate. Default is `false`.\n   * @return {module:ol/coordinate~Coordinate} Coordinate.\n   * @api\n   */\n  getCoordinateAtM(m, opt_extrapolate, opt_interpolate) {\n    if ((this.layout != GeometryLayout.XYM &&\n         this.layout != GeometryLayout.XYZM) ||\n        this.flatCoordinates.length === 0) {\n      return null;\n    }\n    const extrapolate = opt_extrapolate !== undefined ? opt_extrapolate : false;\n    const interpolate = opt_interpolate !== undefined ? opt_interpolate : false;\n    return lineStringsCoordinateAtM(this.flatCoordinates, 0,\n      this.ends_, this.stride, m, extrapolate, interpolate);\n  }\n\n  /**\n   * Return the coordinates of the multilinestring.\n   * @return {Array<Array<module:ol/coordinate~Coordinate>>} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates() {\n    return inflateCoordinatesArray(\n      this.flatCoordinates, 0, this.ends_, this.stride);\n  }\n\n  /**\n   * @return {Array<number>} Ends.\n   */\n  getEnds() {\n    return this.ends_;\n  }\n\n  /**\n   * Return the linestring at the specified index.\n   * @param {number} index Index.\n   * @return {module:ol/geom/LineString} LineString.\n   * @api\n   */\n  getLineString(index) {\n    if (index < 0 || this.ends_.length <= index) {\n      return null;\n    }\n    return new LineString(this.flatCoordinates.slice(\n      index === 0 ? 0 : this.ends_[index - 1], this.ends_[index]), this.layout);\n  }\n\n  /**\n   * Return the linestrings of this multilinestring.\n   * @return {Array<module:ol/geom/LineString>} LineStrings.\n   * @api\n   */\n  getLineStrings() {\n    const flatCoordinates = this.flatCoordinates;\n    const ends = this.ends_;\n    const layout = this.layout;\n    /** @type {Array<module:ol/geom/LineString>} */\n    const lineStrings = [];\n    let offset = 0;\n    for (let i = 0, ii = ends.length; i < ii; ++i) {\n      const end = ends[i];\n      const lineString = new LineString(flatCoordinates.slice(offset, end), layout);\n      lineStrings.push(lineString);\n      offset = end;\n    }\n    return lineStrings;\n  }\n\n  /**\n   * @return {Array<number>} Flat midpoints.\n   */\n  getFlatMidpoints() {\n    const midpoints = [];\n    const flatCoordinates = this.flatCoordinates;\n    let offset = 0;\n    const ends = this.ends_;\n    const stride = this.stride;\n    for (let i = 0, ii = ends.length; i < ii; ++i) {\n      const end = ends[i];\n      const midpoint = interpolatePoint(\n        flatCoordinates, offset, end, stride, 0.5);\n      extend(midpoints, midpoint);\n      offset = end;\n    }\n    return midpoints;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometryInternal(squaredTolerance) {\n    const simplifiedFlatCoordinates = [];\n    const simplifiedEnds = [];\n    simplifiedFlatCoordinates.length = douglasPeuckerArray(\n      this.flatCoordinates, 0, this.ends_, this.stride, squaredTolerance,\n      simplifiedFlatCoordinates, 0, simplifiedEnds);\n    return new MultiLineString(simplifiedFlatCoordinates, GeometryLayout.XY, simplifiedEnds);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.MULTI_LINE_STRING;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    return intersectsLineStringArray(\n      this.flatCoordinates, 0, this.ends_, this.stride, extent);\n  }\n\n  /**\n   * Set the coordinates of the multilinestring.\n   * @param {!Array<Array<module:ol/coordinate~Coordinate>>} coordinates Coordinates.\n   * @param {module:ol/geom/GeometryLayout=} opt_layout Layout.\n   * @override\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 2);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    const ends = deflateCoordinatesArray(\n      this.flatCoordinates, 0, coordinates, this.stride, this.ends_);\n    this.flatCoordinates.length = ends.length === 0 ? 0 : ends[ends.length - 1];\n    this.changed();\n  }\n}\n\n\nexport default MultiLineString;\n","/**\n * @module ol/Feature\n */\nimport {assert} from './asserts.js';\nimport {listen, unlisten, unlistenByKey} from './events.js';\nimport EventType from './events/EventType.js';\nimport BaseObject, {getChangeEventType} from './Object.js';\nimport Geometry from './geom/Geometry.js';\nimport Style from './style/Style.js';\n\n/**\n * @classdesc\n * A vector object for geographic features with a geometry and other\n * attribute properties, similar to the features in vector file formats like\n * GeoJSON.\n *\n * Features can be styled individually with `setStyle`; otherwise they use the\n * style of their vector layer.\n *\n * Note that attribute properties are set as {@link module:ol/Object} properties on\n * the feature object, so they are observable, and have get/set accessors.\n *\n * Typically, a feature has a single geometry property. You can set the\n * geometry using the `setGeometry` method and get it with `getGeometry`.\n * It is possible to store more than one geometry on a feature using attribute\n * properties. By default, the geometry used for rendering is identified by\n * the property name `geometry`. If you want to use another geometry property\n * for rendering, use the `setGeometryName` method to change the attribute\n * property associated with the geometry for the feature.  For example:\n *\n * ```js\n *\n * import Feature from 'ol/Feature';\n * import Polygon from 'ol/geom/Polygon';\n * import Point from 'ol/geom/Point';\n *\n * var feature = new Feature({\n *   geometry: new Polygon(polyCoords),\n *   labelPoint: new Point(labelCoords),\n *   name: 'My Polygon'\n * });\n *\n * // get the polygon geometry\n * var poly = feature.getGeometry();\n *\n * // Render the feature as a point using the coordinates from labelPoint\n * feature.setGeometryName('labelPoint');\n *\n * // get the point geometry\n * var point = feature.getGeometry();\n * ```\n *\n * @api\n */\nclass Feature extends BaseObject {\n  /**\n   * @param {module:ol/geom/Geometry|Object<string, *>=} opt_geometryOrProperties\n   *     You may pass a Geometry object directly, or an object literal containing\n   *     properties. If you pass an object literal, you may include a Geometry\n   *     associated with a `geometry` key.\n   */\n  constructor(opt_geometryOrProperties) {\n\n    super();\n\n    /**\n     * @private\n     * @type {number|string|undefined}\n     */\n    this.id_ = undefined;\n\n    /**\n     * @type {string}\n     * @private\n     */\n    this.geometryName_ = 'geometry';\n\n    /**\n     * User provided style.\n     * @private\n     * @type {module:ol/style/Style|Array<module:ol/style/Style>|module:ol/style/Style~StyleFunction}\n     */\n    this.style_ = null;\n\n    /**\n     * @private\n     * @type {module:ol/style/Style~StyleFunction|undefined}\n     */\n    this.styleFunction_ = undefined;\n\n    /**\n     * @private\n     * @type {?module:ol/events~EventsKey}\n     */\n    this.geometryChangeKey_ = null;\n\n    listen(\n      this, getChangeEventType(this.geometryName_),\n      this.handleGeometryChanged_, this);\n\n    if (opt_geometryOrProperties !== undefined) {\n      if (opt_geometryOrProperties instanceof Geometry ||\n          !opt_geometryOrProperties) {\n        const geometry = opt_geometryOrProperties;\n        this.setGeometry(geometry);\n      } else {\n        /** @type {Object<string, *>} */\n        const properties = opt_geometryOrProperties;\n        this.setProperties(properties);\n      }\n    }\n  }\n\n  /**\n   * Clone this feature. If the original feature has a geometry it\n   * is also cloned. The feature id is not set in the clone.\n   * @return {module:ol/Feature} The clone.\n   * @api\n   */\n  clone() {\n    const clone = new Feature(this.getProperties());\n    clone.setGeometryName(this.getGeometryName());\n    const geometry = this.getGeometry();\n    if (geometry) {\n      clone.setGeometry(geometry.clone());\n    }\n    const style = this.getStyle();\n    if (style) {\n      clone.setStyle(style);\n    }\n    return clone;\n  }\n\n  /**\n   * Get the feature's default geometry.  A feature may have any number of named\n   * geometries.  The \"default\" geometry (the one that is rendered by default) is\n   * set when calling {@link module:ol/Feature~Feature#setGeometry}.\n   * @return {module:ol/geom/Geometry|undefined} The default geometry for the feature.\n   * @api\n   * @observable\n   */\n  getGeometry() {\n    return (\n      /** @type {module:ol/geom/Geometry|undefined} */ (this.get(this.geometryName_))\n    );\n  }\n\n  /**\n   * Get the feature identifier.  This is a stable identifier for the feature and\n   * is either set when reading data from a remote source or set explicitly by\n   * calling {@link module:ol/Feature~Feature#setId}.\n   * @return {number|string|undefined} Id.\n   * @api\n   */\n  getId() {\n    return this.id_;\n  }\n\n  /**\n   * Get the name of the feature's default geometry.  By default, the default\n   * geometry is named `geometry`.\n   * @return {string} Get the property name associated with the default geometry\n   *     for this feature.\n   * @api\n   */\n  getGeometryName() {\n    return this.geometryName_;\n  }\n\n  /**\n   * Get the feature's style. Will return what was provided to the\n   * {@link module:ol/Feature~Feature#setStyle} method.\n   * @return {module:ol/style/Style|Array<module:ol/style/Style>|module:ol/style/Style~StyleFunction} The feature style.\n   * @api\n   */\n  getStyle() {\n    return this.style_;\n  }\n\n  /**\n   * Get the feature's style function.\n   * @return {module:ol/style/Style~StyleFunction|undefined} Return a function\n   * representing the current style of this feature.\n   * @api\n   */\n  getStyleFunction() {\n    return this.styleFunction_;\n  }\n\n  /**\n   * @private\n   */\n  handleGeometryChange_() {\n    this.changed();\n  }\n\n  /**\n   * @private\n   */\n  handleGeometryChanged_() {\n    if (this.geometryChangeKey_) {\n      unlistenByKey(this.geometryChangeKey_);\n      this.geometryChangeKey_ = null;\n    }\n    const geometry = this.getGeometry();\n    if (geometry) {\n      this.geometryChangeKey_ = listen(geometry,\n        EventType.CHANGE, this.handleGeometryChange_, this);\n    }\n    this.changed();\n  }\n\n  /**\n   * Set the default geometry for the feature.  This will update the property\n   * with the name returned by {@link module:ol/Feature~Feature#getGeometryName}.\n   * @param {module:ol/geom/Geometry|undefined} geometry The new geometry.\n   * @api\n   * @observable\n   */\n  setGeometry(geometry) {\n    this.set(this.geometryName_, geometry);\n  }\n\n  /**\n   * Set the style for the feature.  This can be a single style object, an array\n   * of styles, or a function that takes a resolution and returns an array of\n   * styles. If it is `null` the feature has no style (a `null` style).\n   * @param {module:ol/style/Style|Array<module:ol/style/Style>|module:ol/style/Style~StyleFunction} style Style for this feature.\n   * @api\n   * @fires module:ol/events/Event~Event#event:change\n   */\n  setStyle(style) {\n    this.style_ = style;\n    this.styleFunction_ = !style ? undefined : createStyleFunction(style);\n    this.changed();\n  }\n\n  /**\n   * Set the feature id.  The feature id is considered stable and may be used when\n   * requesting features or comparing identifiers returned from a remote source.\n   * The feature id can be used with the\n   * {@link module:ol/source/Vector~VectorSource#getFeatureById} method.\n   * @param {number|string|undefined} id The feature id.\n   * @api\n   * @fires module:ol/events/Event~Event#event:change\n   */\n  setId(id) {\n    this.id_ = id;\n    this.changed();\n  }\n\n  /**\n   * Set the property name to be used when getting the feature's default geometry.\n   * When calling {@link module:ol/Feature~Feature#getGeometry}, the value of the property with\n   * this name will be returned.\n   * @param {string} name The property name of the default geometry.\n   * @api\n   */\n  setGeometryName(name) {\n    unlisten(\n      this, getChangeEventType(this.geometryName_),\n      this.handleGeometryChanged_, this);\n    this.geometryName_ = name;\n    listen(\n      this, getChangeEventType(this.geometryName_),\n      this.handleGeometryChanged_, this);\n    this.handleGeometryChanged_();\n  }\n}\n\n\n/**\n * Convert the provided object into a feature style function.  Functions passed\n * through unchanged.  Arrays of module:ol/style/Style or single style objects wrapped\n * in a new feature style function.\n * @param {module:ol/style/Style~StyleFunction|!Array<module:ol/style/Style>|!module:ol/style/Style} obj\n *     A feature style function, a single style, or an array of styles.\n * @return {module:ol/style/Style~StyleFunction} A style function.\n */\nexport function createStyleFunction(obj) {\n  if (typeof obj === 'function') {\n    return obj;\n  } else {\n    /**\n     * @type {Array<module:ol/style/Style>}\n     */\n    let styles;\n    if (Array.isArray(obj)) {\n      styles = obj;\n    } else {\n      assert(obj instanceof Style,\n        41); // Expected an `module:ol/style/Style~Style` or an array of `module:ol/style/Style~Style`\n      styles = [obj];\n    }\n    return function() {\n      return styles;\n    };\n  }\n}\nexport default Feature;\n","/**\n * @module ol/format/JSONFeature\n */\nimport FeatureFormat from '../format/Feature.js';\nimport FormatType from '../format/FormatType.js';\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * Base class for JSON feature formats.\n *\n * @abstract\n */\nclass JSONFeature extends FeatureFormat {\n  constructor() {\n    super();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getType() {\n    return FormatType.JSON;\n  }\n\n  /**\n   * Read a feature.  Only works for a single feature. Use `readFeatures` to\n   * read a feature collection.\n   *\n   * @param {ArrayBuffer|Document|Node|Object|string} source Source.\n   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.\n   * @return {module:ol/Feature} Feature.\n   * @api\n   */\n  readFeature(source, opt_options) {\n    return this.readFeatureFromObject(\n      getObject(source), this.getReadOptions(source, opt_options));\n  }\n\n  /**\n   * Read all features.  Works with both a single feature and a feature\n   * collection.\n   *\n   * @param {ArrayBuffer|Document|Node|Object|string} source Source.\n   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.\n   * @return {Array<module:ol/Feature>} Features.\n   * @api\n   */\n  readFeatures(source, opt_options) {\n    return this.readFeaturesFromObject(\n      getObject(source), this.getReadOptions(source, opt_options));\n  }\n\n  /**\n   * @abstract\n   * @param {Object} object Object.\n   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.\n   * @protected\n   * @return {module:ol/Feature} Feature.\n   */\n  readFeatureFromObject(object, opt_options) {}\n\n  /**\n   * @abstract\n   * @param {Object} object Object.\n   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.\n   * @protected\n   * @return {Array<module:ol/Feature>} Features.\n   */\n  readFeaturesFromObject(object, opt_options) {}\n\n  /**\n   * Read a geometry.\n   *\n   * @param {ArrayBuffer|Document|Node|Object|string} source Source.\n   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.\n   * @return {module:ol/geom/Geometry} Geometry.\n   * @api\n   */\n  readGeometry(source, opt_options) {\n    return this.readGeometryFromObject(\n      getObject(source), this.getReadOptions(source, opt_options));\n  }\n\n  /**\n   * @abstract\n   * @param {Object} object Object.\n   * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.\n   * @protected\n   * @return {module:ol/geom/Geometry} Geometry.\n   */\n  readGeometryFromObject(object, opt_options) {}\n\n  /**\n   * Read the projection.\n   *\n   * @param {ArrayBuffer|Document|Node|Object|string} source Source.\n   * @return {module:ol/proj/Projection} Projection.\n   * @api\n   */\n  readProjection(source) {\n    return this.readProjectionFromObject(getObject(source));\n  }\n\n  /**\n   * @abstract\n   * @param {Object} object Object.\n   * @protected\n   * @return {module:ol/proj/Projection} Projection.\n   */\n  readProjectionFromObject(object) {}\n\n  /**\n   * Encode a feature as string.\n   *\n   * @param {module:ol/Feature} feature Feature.\n   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n   * @return {string} Encoded feature.\n   * @api\n   */\n  writeFeature(feature, opt_options) {\n    return JSON.stringify(this.writeFeatureObject(feature, opt_options));\n  }\n\n  /**\n   * @abstract\n   * @param {module:ol/Feature} feature Feature.\n   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n   * @return {Object} Object.\n   */\n  writeFeatureObject(feature, opt_options) {}\n\n  /**\n   * Encode an array of features as string.\n   *\n   * @param {Array<module:ol/Feature>} features Features.\n   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n   * @return {string} Encoded features.\n   * @api\n   */\n  writeFeatures(features, opt_options) {\n    return JSON.stringify(this.writeFeaturesObject(features, opt_options));\n  }\n\n  /**\n   * @abstract\n   * @param {Array<module:ol/Feature>} features Features.\n   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n   * @return {Object} Object.\n   */\n  writeFeaturesObject(features, opt_options) {}\n\n  /**\n   * Encode a geometry as string.\n   *\n   * @param {module:ol/geom/Geometry} geometry Geometry.\n   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n   * @return {string} Encoded geometry.\n   * @api\n   */\n  writeGeometry(geometry, opt_options) {\n    return JSON.stringify(this.writeGeometryObject(geometry, opt_options));\n  }\n\n  /**\n   * @abstract\n   * @param {module:ol/geom/Geometry} geometry Geometry.\n   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n   * @return {Object} Object.\n   */\n  writeGeometryObject(geometry, opt_options) {}\n}\n\n\n/**\n * @param {Document|Node|Object|string} source Source.\n * @return {Object} Object.\n */\nfunction getObject(source) {\n  if (typeof source === 'string') {\n    const object = JSON.parse(source);\n    return object ? /** @type {Object} */ (object) : null;\n  } else if (source !== null) {\n    return source;\n  } else {\n    return null;\n  }\n}\n\n\nexport default JSONFeature;\n","/**\n * @module ol/geom/GeometryCollection\n */\nimport {listen, unlisten} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {createOrUpdateEmpty, closestSquaredDistanceXY, extend, getCenter} from '../extent.js';\nimport Geometry from '../geom/Geometry.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport {clear} from '../obj.js';\n\n/**\n * @classdesc\n * An array of {@link module:ol/geom/Geometry} objects.\n *\n * @api\n */\nclass GeometryCollection extends Geometry {\n\n  /**\n   * @param {Array<module:ol/geom/Geometry>=} opt_geometries Geometries.\n   */\n  constructor(opt_geometries) {\n\n    super();\n\n    /**\n     * @private\n     * @type {Array<module:ol/geom/Geometry>}\n     */\n    this.geometries_ = opt_geometries ? opt_geometries : null;\n\n    this.listenGeometriesChange_();\n  }\n\n  /**\n   * @private\n   */\n  unlistenGeometriesChange_() {\n    if (!this.geometries_) {\n      return;\n    }\n    for (let i = 0, ii = this.geometries_.length; i < ii; ++i) {\n      unlisten(\n        this.geometries_[i], EventType.CHANGE,\n        this.changed, this);\n    }\n  }\n\n  /**\n   * @private\n   */\n  listenGeometriesChange_() {\n    if (!this.geometries_) {\n      return;\n    }\n    for (let i = 0, ii = this.geometries_.length; i < ii; ++i) {\n      listen(\n        this.geometries_[i], EventType.CHANGE,\n        this.changed, this);\n    }\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!module:ol/geom/GeometryCollection} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    const geometryCollection = new GeometryCollection(null);\n    geometryCollection.setGeometries(this.geometries_);\n    return geometryCollection;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    const geometries = this.geometries_;\n    for (let i = 0, ii = geometries.length; i < ii; ++i) {\n      minSquaredDistance = geometries[i].closestPointXY(\n        x, y, closestPoint, minSquaredDistance);\n    }\n    return minSquaredDistance;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  containsXY(x, y) {\n    const geometries = this.geometries_;\n    for (let i = 0, ii = geometries.length; i < ii; ++i) {\n      if (geometries[i].containsXY(x, y)) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  computeExtent(extent) {\n    createOrUpdateEmpty(extent);\n    const geometries = this.geometries_;\n    for (let i = 0, ii = geometries.length; i < ii; ++i) {\n      extend(extent, geometries[i].getExtent());\n    }\n    return extent;\n  }\n\n  /**\n   * Return the geometries that make up this geometry collection.\n   * @return {Array<module:ol/geom/Geometry>} Geometries.\n   * @api\n   */\n  getGeometries() {\n    return cloneGeometries(this.geometries_);\n  }\n\n  /**\n   * @return {Array<module:ol/geom/Geometry>} Geometries.\n   */\n  getGeometriesArray() {\n    return this.geometries_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometry(squaredTolerance) {\n    if (this.simplifiedGeometryRevision != this.getRevision()) {\n      clear(this.simplifiedGeometryCache);\n      this.simplifiedGeometryMaxMinSquaredTolerance = 0;\n      this.simplifiedGeometryRevision = this.getRevision();\n    }\n    if (squaredTolerance < 0 ||\n        (this.simplifiedGeometryMaxMinSquaredTolerance !== 0 &&\n         squaredTolerance < this.simplifiedGeometryMaxMinSquaredTolerance)) {\n      return this;\n    }\n    const key = squaredTolerance.toString();\n    if (this.simplifiedGeometryCache.hasOwnProperty(key)) {\n      return this.simplifiedGeometryCache[key];\n    } else {\n      const simplifiedGeometries = [];\n      const geometries = this.geometries_;\n      let simplified = false;\n      for (let i = 0, ii = geometries.length; i < ii; ++i) {\n        const geometry = geometries[i];\n        const simplifiedGeometry = geometry.getSimplifiedGeometry(squaredTolerance);\n        simplifiedGeometries.push(simplifiedGeometry);\n        if (simplifiedGeometry !== geometry) {\n          simplified = true;\n        }\n      }\n      if (simplified) {\n        const simplifiedGeometryCollection = new GeometryCollection(null);\n        simplifiedGeometryCollection.setGeometriesArray(simplifiedGeometries);\n        this.simplifiedGeometryCache[key] = simplifiedGeometryCollection;\n        return simplifiedGeometryCollection;\n      } else {\n        this.simplifiedGeometryMaxMinSquaredTolerance = squaredTolerance;\n        return this;\n      }\n    }\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.GEOMETRY_COLLECTION;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    const geometries = this.geometries_;\n    for (let i = 0, ii = geometries.length; i < ii; ++i) {\n      if (geometries[i].intersectsExtent(extent)) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /**\n   * @return {boolean} Is empty.\n   */\n  isEmpty() {\n    return this.geometries_.length === 0;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  rotate(angle, anchor) {\n    const geometries = this.geometries_;\n    for (let i = 0, ii = geometries.length; i < ii; ++i) {\n      geometries[i].rotate(angle, anchor);\n    }\n    this.changed();\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  scale(sx, opt_sy, opt_anchor) {\n    let anchor = opt_anchor;\n    if (!anchor) {\n      anchor = getCenter(this.getExtent());\n    }\n    const geometries = this.geometries_;\n    for (let i = 0, ii = geometries.length; i < ii; ++i) {\n      geometries[i].scale(sx, opt_sy, anchor);\n    }\n    this.changed();\n  }\n\n  /**\n   * Set the geometries that make up this geometry collection.\n   * @param {Array<module:ol/geom/Geometry>} geometries Geometries.\n   * @api\n   */\n  setGeometries(geometries) {\n    this.setGeometriesArray(cloneGeometries(geometries));\n  }\n\n  /**\n   * @param {Array<module:ol/geom/Geometry>} geometries Geometries.\n   */\n  setGeometriesArray(geometries) {\n    this.unlistenGeometriesChange_();\n    this.geometries_ = geometries;\n    this.listenGeometriesChange_();\n    this.changed();\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  applyTransform(transformFn) {\n    const geometries = this.geometries_;\n    for (let i = 0, ii = geometries.length; i < ii; ++i) {\n      geometries[i].applyTransform(transformFn);\n    }\n    this.changed();\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  translate(deltaX, deltaY) {\n    const geometries = this.geometries_;\n    for (let i = 0, ii = geometries.length; i < ii; ++i) {\n      geometries[i].translate(deltaX, deltaY);\n    }\n    this.changed();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    this.unlistenGeometriesChange_();\n    super.disposeInternal();\n  }\n}\n\n\n/**\n * @param {Array<module:ol/geom/Geometry>} geometries Geometries.\n * @return {Array<module:ol/geom/Geometry>} Cloned geometries.\n */\nfunction cloneGeometries(geometries) {\n  const clonedGeometries = [];\n  for (let i = 0, ii = geometries.length; i < ii; ++i) {\n    clonedGeometries.push(geometries[i].clone());\n  }\n  return clonedGeometries;\n}\n\n\nexport default GeometryCollection;\n","/**\n * @module ol/format/GeoJSON\n */\n// TODO: serialize dataProjection as crs member when writing\n// see https://github.com/openlayers/openlayers/issues/2078\n\nimport {assert} from '../asserts.js';\nimport Feature from '../Feature.js';\nimport {transformWithOptions} from '../format/Feature.js';\nimport JSONFeature from '../format/JSONFeature.js';\nimport GeometryCollection from '../geom/GeometryCollection.js';\nimport LineString from '../geom/LineString.js';\nimport MultiLineString from '../geom/MultiLineString.js';\nimport MultiPoint from '../geom/MultiPoint.js';\nimport MultiPolygon from '../geom/MultiPolygon.js';\nimport Point from '../geom/Point.js';\nimport Polygon from '../geom/Polygon.js';\nimport {assign, isEmpty} from '../obj.js';\nimport {get as getProjection} from '../proj.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {module:ol/proj~ProjectionLike} [dataProjection='EPSG:4326'] Default data projection.\n * @property {module:ol/proj~ProjectionLike} [featureProjection] Projection for features read or\n * written by the format.  Options passed to read or write methods will take precedence.\n * @property {string} [geometryName] Geometry name to use when creating features.\n * @property {boolean} [extractGeometryName=false] Certain GeoJSON providers include\n * the geometry_name field in the feature GeoJSON. If set to `true` the GeoJSON reader\n * will look for that field to set the geometry name. If both this field is set to `true`\n * and a `geometryName` is provided, the `geometryName` will take precedence.\n */\n\n\n/**\n * @classdesc\n * Feature format for reading and writing data in the GeoJSON format.\n *\n  * @api\n */\nclass GeoJSON extends JSONFeature {\n\n  /**\n   * @param {module:ol/format/GeoJSON~Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super();\n\n    /**\n     * @inheritDoc\n     */\n    this.dataProjection = getProjection(\n      options.dataProjection ?\n        options.dataProjection : 'EPSG:4326');\n\n    if (options.featureProjection) {\n      this.defaultFeatureProjection = getProjection(options.featureProjection);\n    }\n\n    /**\n     * Name of the geometry attribute for features.\n     * @type {string|undefined}\n     * @private\n     */\n    this.geometryName_ = options.geometryName;\n\n    /**\n     * Look for the geometry name in the feature GeoJSON\n     * @type {boolean|undefined}\n     * @private\n     */\n    this.extractGeometryName_ = options.extractGeometryName;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  readFeatureFromObject(object, opt_options) {\n    /**\n     * @type {GeoJSONFeature}\n     */\n    let geoJSONFeature = null;\n    if (object.type === 'Feature') {\n      geoJSONFeature = /** @type {GeoJSONFeature} */ (object);\n    } else {\n      geoJSONFeature = /** @type {GeoJSONFeature} */ ({\n        type: 'Feature',\n        geometry: /** @type {GeoJSONGeometry|GeoJSONGeometryCollection} */ (object)\n      });\n    }\n\n    const geometry = readGeometry(geoJSONFeature.geometry, opt_options);\n    const feature = new Feature();\n    if (this.geometryName_) {\n      feature.setGeometryName(this.geometryName_);\n    } else if (this.extractGeometryName_ && geoJSONFeature.geometry_name !== undefined) {\n      feature.setGeometryName(geoJSONFeature.geometry_name);\n    }\n    feature.setGeometry(geometry);\n    if (geoJSONFeature.id !== undefined) {\n      feature.setId(geoJSONFeature.id);\n    }\n    if (geoJSONFeature.properties) {\n      feature.setProperties(geoJSONFeature.properties);\n    }\n    return feature;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  readFeaturesFromObject(object, opt_options) {\n    const geoJSONObject = /** @type {GeoJSONObject} */ (object);\n    /** @type {Array<module:ol/Feature>} */\n    let features = null;\n    if (geoJSONObject.type === 'FeatureCollection') {\n      const geoJSONFeatureCollection = /** @type {GeoJSONFeatureCollection} */ (object);\n      features = [];\n      const geoJSONFeatures = geoJSONFeatureCollection.features;\n      for (let i = 0, ii = geoJSONFeatures.length; i < ii; ++i) {\n        features.push(this.readFeatureFromObject(geoJSONFeatures[i], opt_options));\n      }\n    } else {\n      features = [this.readFeatureFromObject(object, opt_options)];\n    }\n    return features;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  readGeometryFromObject(object, opt_options) {\n    return readGeometry(/** @type {GeoJSONGeometry} */ (object), opt_options);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  readProjectionFromObject(object) {\n    const geoJSONObject = /** @type {GeoJSONObject} */ (object);\n    const crs = geoJSONObject.crs;\n    let projection;\n    if (crs) {\n      if (crs.type == 'name') {\n        projection = getProjection(crs.properties.name);\n      } else {\n        assert(false, 36); // Unknown SRS type\n      }\n    } else {\n      projection = this.dataProjection;\n    }\n    return (\n      /** @type {module:ol/proj/Projection} */ (projection)\n    );\n  }\n\n  /**\n   * Encode a feature as a GeoJSON Feature object.\n   *\n   * @param {module:ol/Feature} feature Feature.\n   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n   * @return {GeoJSONFeature} Object.\n   * @override\n   * @api\n   */\n  writeFeatureObject(feature, opt_options) {\n    opt_options = this.adaptOptions(opt_options);\n\n    const object = /** @type {GeoJSONFeature} */ ({\n      'type': 'Feature'\n    });\n    const id = feature.getId();\n    if (id !== undefined) {\n      object.id = id;\n    }\n    const geometry = feature.getGeometry();\n    if (geometry) {\n      object.geometry = writeGeometry(geometry, opt_options);\n    } else {\n      object.geometry = null;\n    }\n    const properties = feature.getProperties();\n    delete properties[feature.getGeometryName()];\n    if (!isEmpty(properties)) {\n      object.properties = properties;\n    } else {\n      object.properties = null;\n    }\n    return object;\n  }\n\n  /**\n   * Encode an array of features as a GeoJSON object.\n   *\n   * @param {Array<module:ol/Feature>} features Features.\n   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n   * @return {GeoJSONFeatureCollection} GeoJSON Object.\n   * @override\n   * @api\n   */\n  writeFeaturesObject(features, opt_options) {\n    opt_options = this.adaptOptions(opt_options);\n    const objects = [];\n    for (let i = 0, ii = features.length; i < ii; ++i) {\n      objects.push(this.writeFeatureObject(features[i], opt_options));\n    }\n    return /** @type {GeoJSONFeatureCollection} */ ({\n      type: 'FeatureCollection',\n      features: objects\n    });\n  }\n\n  /**\n   * Encode a geometry as a GeoJSON object.\n   *\n   * @param {module:ol/geom/Geometry} geometry Geometry.\n   * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n   * @return {GeoJSONGeometry|GeoJSONGeometryCollection} Object.\n   * @override\n   * @api\n   */\n  writeGeometryObject(geometry, opt_options) {\n    return writeGeometry(geometry, this.adaptOptions(opt_options));\n  }\n}\n\n\n/**\n * @const\n * @type {Object<string, function(GeoJSONObject): module:ol/geom/Geometry>}\n */\nconst GEOMETRY_READERS = {\n  'Point': readPointGeometry,\n  'LineString': readLineStringGeometry,\n  'Polygon': readPolygonGeometry,\n  'MultiPoint': readMultiPointGeometry,\n  'MultiLineString': readMultiLineStringGeometry,\n  'MultiPolygon': readMultiPolygonGeometry,\n  'GeometryCollection': readGeometryCollectionGeometry\n};\n\n\n/**\n * @const\n * @type {Object<string, function(module:ol/geom/Geometry, module:ol/format/Feature~WriteOptions=): (GeoJSONGeometry|GeoJSONGeometryCollection)>}\n */\nconst GEOMETRY_WRITERS = {\n  'Point': writePointGeometry,\n  'LineString': writeLineStringGeometry,\n  'Polygon': writePolygonGeometry,\n  'MultiPoint': writeMultiPointGeometry,\n  'MultiLineString': writeMultiLineStringGeometry,\n  'MultiPolygon': writeMultiPolygonGeometry,\n  'GeometryCollection': writeGeometryCollectionGeometry,\n  'Circle': writeEmptyGeometryCollectionGeometry\n};\n\n\n/**\n * @param {GeoJSONGeometry|GeoJSONGeometryCollection} object Object.\n * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.\n * @return {module:ol/geom/Geometry} Geometry.\n */\nfunction readGeometry(object, opt_options) {\n  if (!object) {\n    return null;\n  }\n  const geometryReader = GEOMETRY_READERS[object.type];\n  return (\n    /** @type {module:ol/geom/Geometry} */ (transformWithOptions(geometryReader(object), false, opt_options))\n  );\n}\n\n\n/**\n * @param {GeoJSONGeometryCollection} object Object.\n * @param {module:ol/format/Feature~ReadOptions=} opt_options Read options.\n * @return {module:ol/geom/GeometryCollection} Geometry collection.\n */\nfunction readGeometryCollectionGeometry(object, opt_options) {\n  const geometries = object.geometries.map(\n    /**\n     * @param {GeoJSONGeometry} geometry Geometry.\n     * @return {module:ol/geom/Geometry} geometry Geometry.\n     */\n    function(geometry) {\n      return readGeometry(geometry, opt_options);\n    });\n  return new GeometryCollection(geometries);\n}\n\n\n/**\n * @param {GeoJSONGeometry} object Object.\n * @return {module:ol/geom/Point} Point.\n */\nfunction readPointGeometry(object) {\n  return new Point(object.coordinates);\n}\n\n\n/**\n * @param {GeoJSONGeometry} object Object.\n * @return {module:ol/geom/LineString} LineString.\n */\nfunction readLineStringGeometry(object) {\n  return new LineString(object.coordinates);\n}\n\n\n/**\n * @param {GeoJSONGeometry} object Object.\n * @return {module:ol/geom/MultiLineString} MultiLineString.\n */\nfunction readMultiLineStringGeometry(object) {\n  return new MultiLineString(object.coordinates);\n}\n\n\n/**\n * @param {GeoJSONGeometry} object Object.\n * @return {module:ol/geom/MultiPoint} MultiPoint.\n */\nfunction readMultiPointGeometry(object) {\n  return new MultiPoint(object.coordinates);\n}\n\n\n/**\n * @param {GeoJSONGeometry} object Object.\n * @return {module:ol/geom/MultiPolygon} MultiPolygon.\n */\nfunction readMultiPolygonGeometry(object) {\n  return new MultiPolygon(object.coordinates);\n}\n\n\n/**\n * @param {GeoJSONGeometry} object Object.\n * @return {module:ol/geom/Polygon} Polygon.\n */\nfunction readPolygonGeometry(object) {\n  return new Polygon(object.coordinates);\n}\n\n\n/**\n * @param {module:ol/geom/Geometry} geometry Geometry.\n * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n * @return {GeoJSONGeometry|GeoJSONGeometryCollection} GeoJSON geometry.\n */\nfunction writeGeometry(geometry, opt_options) {\n  const geometryWriter = GEOMETRY_WRITERS[geometry.getType()];\n  return geometryWriter(/** @type {module:ol/geom/Geometry} */ (\n    transformWithOptions(geometry, true, opt_options)), opt_options);\n}\n\n\n/**\n * @param {module:ol/geom/Geometry} geometry Geometry.\n * @return {GeoJSONGeometryCollection} Empty GeoJSON geometry collection.\n */\nfunction writeEmptyGeometryCollectionGeometry(geometry) {\n  return /** @type {GeoJSONGeometryCollection} */ ({\n    type: 'GeometryCollection',\n    geometries: []\n  });\n}\n\n\n/**\n * @param {module:ol/geom/GeometryCollection} geometry Geometry.\n * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n * @return {GeoJSONGeometryCollection} GeoJSON geometry collection.\n */\nfunction writeGeometryCollectionGeometry(geometry, opt_options) {\n  const geometries = geometry.getGeometriesArray().map(function(geometry) {\n    const options = assign({}, opt_options);\n    delete options.featureProjection;\n    return writeGeometry(geometry, options);\n  });\n  return /** @type {GeoJSONGeometryCollection} */ ({\n    type: 'GeometryCollection',\n    geometries: geometries\n  });\n}\n\n\n/**\n * @param {module:ol/geom/LineString} geometry Geometry.\n * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n * @return {GeoJSONGeometry} GeoJSON geometry.\n */\nfunction writeLineStringGeometry(geometry, opt_options) {\n  return /** @type {GeoJSONGeometry} */ ({\n    type: 'LineString',\n    coordinates: geometry.getCoordinates()\n  });\n}\n\n\n/**\n * @param {module:ol/geom/MultiLineString} geometry Geometry.\n * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n * @return {GeoJSONGeometry} GeoJSON geometry.\n */\nfunction writeMultiLineStringGeometry(geometry, opt_options) {\n  return /** @type {GeoJSONGeometry} */ ({\n    type: 'MultiLineString',\n    coordinates: geometry.getCoordinates()\n  });\n}\n\n\n/**\n * @param {module:ol/geom/MultiPoint} geometry Geometry.\n * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n * @return {GeoJSONGeometry} GeoJSON geometry.\n */\nfunction writeMultiPointGeometry(geometry, opt_options) {\n  return /** @type {GeoJSONGeometry} */ ({\n    type: 'MultiPoint',\n    coordinates: geometry.getCoordinates()\n  });\n}\n\n\n/**\n * @param {module:ol/geom/MultiPolygon} geometry Geometry.\n * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n * @return {GeoJSONGeometry} GeoJSON geometry.\n */\nfunction writeMultiPolygonGeometry(geometry, opt_options) {\n  let right;\n  if (opt_options) {\n    right = opt_options.rightHanded;\n  }\n  return /** @type {GeoJSONGeometry} */ ({\n    type: 'MultiPolygon',\n    coordinates: geometry.getCoordinates(right)\n  });\n}\n\n\n/**\n * @param {module:ol/geom/Point} geometry Geometry.\n * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n * @return {GeoJSONGeometry} GeoJSON geometry.\n */\nfunction writePointGeometry(geometry, opt_options) {\n  return /** @type {GeoJSONGeometry} */ ({\n    type: 'Point',\n    coordinates: geometry.getCoordinates()\n  });\n}\n\n\n/**\n * @param {module:ol/geom/Polygon} geometry Geometry.\n * @param {module:ol/format/Feature~WriteOptions=} opt_options Write options.\n * @return {GeoJSONGeometry} GeoJSON geometry.\n */\nfunction writePolygonGeometry(geometry, opt_options) {\n  let right;\n  if (opt_options) {\n    right = opt_options.rightHanded;\n  }\n  return /** @type {GeoJSONGeometry} */ ({\n    type: 'Polygon',\n    coordinates: geometry.getCoordinates(right)\n  });\n}\n\n\nexport default GeoJSON;\n","/**\n * @module ol/centerconstraint\n */\nimport {clamp} from './math.js';\n\n\n/**\n * @typedef {function((module:ol/coordinate~Coordinate|undefined)): (module:ol/coordinate~Coordinate|undefined)} Type\n */\n\n\n/**\n * @param {module:ol/extent~Extent} extent Extent.\n * @return {module:ol/centerconstraint~Type} The constraint.\n */\nexport function createExtent(extent) {\n  return (\n    /**\n     * @param {module:ol/coordinate~Coordinate=} center Center.\n     * @return {module:ol/coordinate~Coordinate|undefined} Center.\n     */\n    function(center) {\n      if (center) {\n        return [\n          clamp(center[0], extent[0], extent[2]),\n          clamp(center[1], extent[1], extent[3])\n        ];\n      } else {\n        return undefined;\n      }\n    }\n  );\n}\n\n\n/**\n * @param {module:ol/coordinate~Coordinate=} center Center.\n * @return {module:ol/coordinate~Coordinate|undefined} Center.\n */\nexport function none(center) {\n  return center;\n}\n","/**\n * @module ol/ViewProperty\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  CENTER: 'center',\n  RESOLUTION: 'resolution',\n  ROTATION: 'rotation'\n};\n","/**\n * @module ol/View\n */\nimport {DEFAULT_TILE_SIZE} from './tilegrid/common.js';\nimport {getUid} from './util.js';\nimport {VOID} from './functions.js';\nimport {createExtent, none as centerNone} from './centerconstraint.js';\nimport BaseObject from './Object.js';\nimport {createSnapToResolutions, createSnapToPower} from './resolutionconstraint.js';\nimport {createSnapToZero, createSnapToN, none as rotationNone, disable} from './rotationconstraint.js';\nimport ViewHint from './ViewHint.js';\nimport ViewProperty from './ViewProperty.js';\nimport {linearFindNearest} from './array.js';\nimport {assert} from './asserts.js';\nimport {add as addCoordinate, rotate as rotateCoordinate, equals as coordinatesEqual} from './coordinate.js';\nimport {inAndOut} from './easing.js';\nimport {getForViewAndSize, getCenter, getHeight, getWidth, isEmpty} from './extent.js';\nimport GeometryType from './geom/GeometryType.js';\nimport {fromExtent as polygonFromExtent} from './geom/Polygon.js';\nimport SimpleGeometry from './geom/SimpleGeometry.js';\nimport {clamp, modulo} from './math.js';\nimport {assign} from './obj.js';\nimport {createProjection, METERS_PER_UNIT} from './proj.js';\nimport Units from './proj/Units.js';\n\n\n/**\n * An animation configuration\n *\n * @typedef {Object} Animation\n * @property {module:ol/coordinate~Coordinate} [sourceCenter]\n * @property {module:ol/coordinate~Coordinate} [targetCenter]\n * @property {number} [sourceResolution]\n * @property {number} [targetResolution]\n * @property {number} [sourceRotation]\n * @property {number} [targetRotation]\n * @property {module:ol/coordinate~Coordinate} [anchor]\n * @property {number} start\n * @property {number} duration\n * @property {boolean} complete\n * @property {function(number):number} easing\n * @property {function(boolean)} callback\n */\n\n\n/**\n * @typedef {Object} Constraints\n * @property {module:ol/centerconstraint~Type} center\n * @property {module:ol/resolutionconstraint~Type} resolution\n * @property {module:ol/rotationconstraint~Type} rotation\n */\n\n\n/**\n * @typedef {Object} FitOptions\n * @property {module:ol/size~Size} [size] The size in pixels of the box to fit\n * the extent into. Default is the current size of the first map in the DOM that\n * uses this view, or `[100, 100]` if no such map is found.\n * @property {!Array<number>} [padding=[0, 0, 0, 0]] Padding (in pixels) to be\n * cleared inside the view. Values in the array are top, right, bottom and left\n * padding.\n * @property {boolean} [constrainResolution=true] Constrain the resolution.\n * @property {boolean} [nearest=false] If `constrainResolution` is `true`, get\n * the nearest extent instead of the closest that actually fits the view.\n * @property {number} [minResolution=0] Minimum resolution that we zoom to.\n * @property {number} [maxZoom] Maximum zoom level that we zoom to. If\n * `minResolution` is given, this property is ignored.\n * @property {number} [duration] The duration of the animation in milliseconds.\n * By default, there is no animation to the target extent.\n * @property {function(number):number} [easing] The easing function used during\n * the animation (defaults to {@link module:ol/easing~inAndOut}).\n * The function will be called for each frame with a number representing a\n * fraction of the animation's duration.  The function should return a number\n * between 0 and 1 representing the progress toward the destination state.\n * @property {function(boolean)} [callback] Function called when the view is in\n * its final position. The callback will be called with `true` if the animation\n * series completed on its own or `false` if it was cancelled.\n */\n\n\n/**\n * @typedef {Object} ViewOptions\n * @property {module:ol/coordinate~Coordinate} [center] The initial center for\n * the view. The coordinate system for the center is specified with the\n * `projection` option. Layer sources will not be fetched if this is not set,\n * but the center can be set later with {@link #setCenter}.\n * @property {boolean|number} [constrainRotation=true] Rotation constraint.\n * `false` means no constraint. `true` means no constraint, but snap to zero\n * near zero. A number constrains the rotation to that number of values. For\n * example, `4` will constrain the rotation to 0, 90, 180, and 270 degrees.\n * @property {boolean} [enableRotation=true] Enable rotation.\n * If `false`, a rotation constraint that always sets the rotation to zero is\n * used. The `constrainRotation` option has no effect if `enableRotation` is\n * `false`.\n * @property {module:ol/extent~Extent} [extent] The extent that constrains the\n * center, in other words, center cannot be set outside this extent.\n * @property {number} [maxResolution] The maximum resolution used to determine\n * the resolution constraint. It is used together with `minResolution` (or\n * `maxZoom`) and `zoomFactor`. If unspecified it is calculated in such a way\n * that the projection's validity extent fits in a 256x256 px tile. If the\n * projection is Spherical Mercator (the default) then `maxResolution` defaults\n * to `40075016.68557849 / 256 = 156543.03392804097`.\n * @property {number} [minResolution] The minimum resolution used to determine\n * the resolution constraint.  It is used together with `maxResolution` (or\n * `minZoom`) and `zoomFactor`.  If unspecified it is calculated assuming 29\n * zoom levels (with a factor of 2). If the projection is Spherical Mercator\n * (the default) then `minResolution` defaults to\n * `40075016.68557849 / 256 / Math.pow(2, 28) = 0.0005831682455839253`.\n * @property {number} [maxZoom=28] The maximum zoom level used to determine the\n * resolution constraint. It is used together with `minZoom` (or\n * `maxResolution`) and `zoomFactor`.  Note that if `minResolution` is also\n * provided, it is given precedence over `maxZoom`.\n * @property {number} [minZoom=0] The minimum zoom level used to determine the\n * resolution constraint. It is used together with `maxZoom` (or\n * `minResolution`) and `zoomFactor`.  Note that if `maxResolution` is also\n * provided, it is given precedence over `minZoom`.\n * @property {module:ol/proj~ProjectionLike} [projection='EPSG:3857'] The\n * projection. The default is Spherical Mercator.\n * @property {number} [resolution] The initial resolution for the view. The\n * units are `projection` units per pixel (e.g. meters per pixel). An\n * alternative to setting this is to set `zoom`. Layer sources will not be\n * fetched if neither this nor `zoom` are defined, but they can be set later\n * with {@link #setZoom} or {@link #setResolution}.\n * @property {Array<number>} [resolutions] Resolutions to determine the\n * resolution constraint. If set the `maxResolution`, `minResolution`,\n * `minZoom`, `maxZoom`, and `zoomFactor` options are ignored.\n * @property {number} [rotation=0] The initial rotation for the view in radians\n * (positive rotation clockwise, 0 means North).\n * @property {number} [zoom] Only used if `resolution` is not defined. Zoom\n * level used to calculate the initial resolution for the view. The initial\n * resolution is determined using the {@link #constrainResolution} method.\n * @property {number} [zoomFactor=2] The zoom factor used to determine the\n * resolution constraint.\n */\n\n\n/**\n * @typedef {Object} AnimationOptions\n * @property {module:ol/coordinate~Coordinate|undefined} center The center of the view at the end of\n * the animation.\n * @property {number|undefined} zoom The zoom level of the view at the end of the\n * animation. This takes precedence over `resolution`.\n * @property {number|undefined} resolution The resolution of the view at the end\n * of the animation.  If `zoom` is also provided, this option will be ignored.\n * @property {number|undefined} rotation The rotation of the view at the end of\n * the animation.\n * @property {module:ol/coordinate~Coordinate|undefined} anchor Optional anchor to remained fixed\n * during a rotation or resolution animation.\n * @property {number} [duration=1000] The duration of the animation in milliseconds.\n * @property {function(number):number} [easing] The easing function used\n * during the animation (defaults to {@link module:ol/easing~inAndOut}).\n * The function will be called for each frame with a number representing a\n * fraction of the animation's duration.  The function should return a number\n * between 0 and 1 representing the progress toward the destination state.\n */\n\n\n/**\n * @typedef {Object} State\n * @property {module:ol/coordinate~Coordinate} center\n * @property {module:ol/proj/Projection} projection\n * @property {number} resolution\n * @property {number} rotation\n * @property {number} zoom\n */\n\n\n/**\n * Default min zoom level for the map view.\n * @type {number}\n */\nconst DEFAULT_MIN_ZOOM = 0;\n\n\n/**\n * @classdesc\n * A View object represents a simple 2D view of the map.\n *\n * This is the object to act upon to change the center, resolution,\n * and rotation of the map.\n *\n * ### The view states\n *\n * An View is determined by three states: `center`, `resolution`,\n * and `rotation`. Each state has a corresponding getter and setter, e.g.\n * `getCenter` and `setCenter` for the `center` state.\n *\n * An View has a `projection`. The projection determines the\n * coordinate system of the center, and its units determine the units of the\n * resolution (projection units per pixel). The default projection is\n * Spherical Mercator (EPSG:3857).\n *\n * ### The constraints\n *\n * `setCenter`, `setResolution` and `setRotation` can be used to change the\n * states of the view. Any value can be passed to the setters. And the value\n * that is passed to a setter will effectively be the value set in the view,\n * and returned by the corresponding getter.\n *\n * But a View object also has a *resolution constraint*, a\n * *rotation constraint* and a *center constraint*.\n *\n * As said above, no constraints are applied when the setters are used to set\n * new states for the view. Applying constraints is done explicitly through\n * the use of the `constrain*` functions (`constrainResolution` and\n * `constrainRotation` and `constrainCenter`).\n *\n * The main users of the constraints are the interactions and the\n * controls. For example, double-clicking on the map changes the view to\n * the \"next\" resolution. And releasing the fingers after pinch-zooming\n * snaps to the closest resolution (with an animation).\n *\n * The *resolution constraint* snaps to specific resolutions. It is\n * determined by the following options: `resolutions`, `maxResolution`,\n * `maxZoom`, and `zoomFactor`. If `resolutions` is set, the other three\n * options are ignored. See documentation for each option for more\n * information.\n *\n * The *rotation constraint* snaps to specific angles. It is determined\n * by the following options: `enableRotation` and `constrainRotation`.\n * By default the rotation value is snapped to zero when approaching the\n * horizontal.\n *\n * The *center constraint* is determined by the `extent` option. By\n * default the center is not constrained at all.\n *\n  * @api\n */\nclass View extends BaseObject {\n\n  /**\n   * @param {module:ol/View~ViewOptions=} opt_options View options.\n   */\n  constructor(opt_options) {\n    super();\n\n    const options = assign({}, opt_options);\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.hints_ = [0, 0];\n\n    /**\n     * @private\n     * @type {Array<Array<module:ol/View~Animation>>}\n     */\n    this.animations_ = [];\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.updateAnimationKey_;\n\n    this.updateAnimations_ = this.updateAnimations_.bind(this);\n\n    /**\n     * @private\n     * @const\n     * @type {module:ol/proj/Projection}\n     */\n    this.projection_ = createProjection(options.projection, 'EPSG:3857');\n\n    this.applyOptions_(options);\n  }\n\n  /**\n   * Set up the view with the given options.\n   * @param {module:ol/View~ViewOptions} options View options.\n   */\n  applyOptions_(options) {\n\n    /**\n     * @type {Object<string, *>}\n     */\n    const properties = {};\n    properties[ViewProperty.CENTER] = options.center !== undefined ?\n      options.center : null;\n\n    const resolutionConstraintInfo = createResolutionConstraint(options);\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxResolution_ = resolutionConstraintInfo.maxResolution;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.minResolution_ = resolutionConstraintInfo.minResolution;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.zoomFactor_ = resolutionConstraintInfo.zoomFactor;\n\n    /**\n     * @private\n     * @type {Array<number>|undefined}\n     */\n    this.resolutions_ = options.resolutions;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.minZoom_ = resolutionConstraintInfo.minZoom;\n\n    const centerConstraint = createCenterConstraint(options);\n    const resolutionConstraint = resolutionConstraintInfo.constraint;\n    const rotationConstraint = createRotationConstraint(options);\n\n    /**\n     * @private\n     * @type {module:ol/View~Constraints}\n     */\n    this.constraints_ = {\n      center: centerConstraint,\n      resolution: resolutionConstraint,\n      rotation: rotationConstraint\n    };\n\n    if (options.resolution !== undefined) {\n      properties[ViewProperty.RESOLUTION] = options.resolution;\n    } else if (options.zoom !== undefined) {\n      properties[ViewProperty.RESOLUTION] = this.constrainResolution(\n        this.maxResolution_, options.zoom - this.minZoom_);\n\n      if (this.resolutions_) { // in case map zoom is out of min/max zoom range\n        properties[ViewProperty.RESOLUTION] = clamp(\n          Number(this.getResolution() || properties[ViewProperty.RESOLUTION]),\n          this.minResolution_, this.maxResolution_);\n      }\n    }\n    properties[ViewProperty.ROTATION] = options.rotation !== undefined ? options.rotation : 0;\n    this.setProperties(properties);\n\n    /**\n     * @private\n     * @type {module:ol/View~ViewOptions}\n     */\n    this.options_ = options;\n\n  }\n\n  /**\n   * Get an updated version of the view options used to construct the view.  The\n   * current resolution (or zoom), center, and rotation are applied to any stored\n   * options.  The provided options can be used to apply new min/max zoom or\n   * resolution limits.\n   * @param {module:ol/View~ViewOptions} newOptions New options to be applied.\n   * @return {module:ol/View~ViewOptions} New options updated with the current view state.\n   */\n  getUpdatedOptions_(newOptions) {\n    const options = assign({}, this.options_);\n\n    // preserve resolution (or zoom)\n    if (options.resolution !== undefined) {\n      options.resolution = this.getResolution();\n    } else {\n      options.zoom = this.getZoom();\n    }\n\n    // preserve center\n    options.center = this.getCenter();\n\n    // preserve rotation\n    options.rotation = this.getRotation();\n\n    return assign({}, options, newOptions);\n  }\n\n  /**\n   * Animate the view.  The view's center, zoom (or resolution), and rotation\n   * can be animated for smooth transitions between view states.  For example,\n   * to animate the view to a new zoom level:\n   *\n   *     view.animate({zoom: view.getZoom() + 1});\n   *\n   * By default, the animation lasts one second and uses in-and-out easing.  You\n   * can customize this behavior by including `duration` (in milliseconds) and\n   * `easing` options (see {@link module:ol/easing}).\n   *\n   * To chain together multiple animations, call the method with multiple\n   * animation objects.  For example, to first zoom and then pan:\n   *\n   *     view.animate({zoom: 10}, {center: [0, 0]});\n   *\n   * If you provide a function as the last argument to the animate method, it\n   * will get called at the end of an animation series.  The callback will be\n   * called with `true` if the animation series completed on its own or `false`\n   * if it was cancelled.\n   *\n   * Animations are cancelled by user interactions (e.g. dragging the map) or by\n   * calling `view.setCenter()`, `view.setResolution()`, or `view.setRotation()`\n   * (or another method that calls one of these).\n   *\n   * @param {...(module:ol/View~AnimationOptions|function(boolean))} var_args Animation\n   *     options.  Multiple animations can be run in series by passing multiple\n   *     options objects.  To run multiple animations in parallel, call the method\n   *     multiple times.  An optional callback can be provided as a final\n   *     argument.  The callback will be called with a boolean indicating whether\n   *     the animation completed without being cancelled.\n   * @api\n   */\n  animate(var_args) {\n    let animationCount = arguments.length;\n    let callback;\n    if (animationCount > 1 && typeof arguments[animationCount - 1] === 'function') {\n      callback = arguments[animationCount - 1];\n      --animationCount;\n    }\n    if (!this.isDef()) {\n      // if view properties are not yet set, shortcut to the final state\n      const state = arguments[animationCount - 1];\n      if (state.center) {\n        this.setCenter(state.center);\n      }\n      if (state.zoom !== undefined) {\n        this.setZoom(state.zoom);\n      }\n      if (state.rotation !== undefined) {\n        this.setRotation(state.rotation);\n      }\n      if (callback) {\n        animationCallback(callback, true);\n      }\n      return;\n    }\n    let start = Date.now();\n    let center = this.getCenter().slice();\n    let resolution = this.getResolution();\n    let rotation = this.getRotation();\n    const series = [];\n    for (let i = 0; i < animationCount; ++i) {\n      const options = /** @type {module:ol/View~AnimationOptions} */ (arguments[i]);\n\n      const animation = /** @type {module:ol/View~Animation} */ ({\n        start: start,\n        complete: false,\n        anchor: options.anchor,\n        duration: options.duration !== undefined ? options.duration : 1000,\n        easing: options.easing || inAndOut\n      });\n\n      if (options.center) {\n        animation.sourceCenter = center;\n        animation.targetCenter = options.center;\n        center = animation.targetCenter;\n      }\n\n      if (options.zoom !== undefined) {\n        animation.sourceResolution = resolution;\n        animation.targetResolution = this.constrainResolution(\n          this.maxResolution_, options.zoom - this.minZoom_, 0);\n        resolution = animation.targetResolution;\n      } else if (options.resolution) {\n        animation.sourceResolution = resolution;\n        animation.targetResolution = options.resolution;\n        resolution = animation.targetResolution;\n      }\n\n      if (options.rotation !== undefined) {\n        animation.sourceRotation = rotation;\n        const delta = modulo(options.rotation - rotation + Math.PI, 2 * Math.PI) - Math.PI;\n        animation.targetRotation = rotation + delta;\n        rotation = animation.targetRotation;\n      }\n\n      animation.callback = callback;\n\n      // check if animation is a no-op\n      if (isNoopAnimation(animation)) {\n        animation.complete = true;\n        // we still push it onto the series for callback handling\n      } else {\n        start += animation.duration;\n      }\n      series.push(animation);\n    }\n    this.animations_.push(series);\n    this.setHint(ViewHint.ANIMATING, 1);\n    this.updateAnimations_();\n  }\n\n  /**\n   * Determine if the view is being animated.\n   * @return {boolean} The view is being animated.\n   * @api\n   */\n  getAnimating() {\n    return this.hints_[ViewHint.ANIMATING] > 0;\n  }\n\n  /**\n   * Determine if the user is interacting with the view, such as panning or zooming.\n   * @return {boolean} The view is being interacted with.\n   * @api\n   */\n  getInteracting() {\n    return this.hints_[ViewHint.INTERACTING] > 0;\n  }\n\n  /**\n   * Cancel any ongoing animations.\n   * @api\n   */\n  cancelAnimations() {\n    this.setHint(ViewHint.ANIMATING, -this.hints_[ViewHint.ANIMATING]);\n    for (let i = 0, ii = this.animations_.length; i < ii; ++i) {\n      const series = this.animations_[i];\n      if (series[0].callback) {\n        animationCallback(series[0].callback, false);\n      }\n    }\n    this.animations_.length = 0;\n  }\n\n  /**\n   * Update all animations.\n   */\n  updateAnimations_() {\n    if (this.updateAnimationKey_ !== undefined) {\n      cancelAnimationFrame(this.updateAnimationKey_);\n      this.updateAnimationKey_ = undefined;\n    }\n    if (!this.getAnimating()) {\n      return;\n    }\n    const now = Date.now();\n    let more = false;\n    for (let i = this.animations_.length - 1; i >= 0; --i) {\n      const series = this.animations_[i];\n      let seriesComplete = true;\n      for (let j = 0, jj = series.length; j < jj; ++j) {\n        const animation = series[j];\n        if (animation.complete) {\n          continue;\n        }\n        const elapsed = now - animation.start;\n        let fraction = animation.duration > 0 ? elapsed / animation.duration : 1;\n        if (fraction >= 1) {\n          animation.complete = true;\n          fraction = 1;\n        } else {\n          seriesComplete = false;\n        }\n        const progress = animation.easing(fraction);\n        if (animation.sourceCenter) {\n          const x0 = animation.sourceCenter[0];\n          const y0 = animation.sourceCenter[1];\n          const x1 = animation.targetCenter[0];\n          const y1 = animation.targetCenter[1];\n          const x = x0 + progress * (x1 - x0);\n          const y = y0 + progress * (y1 - y0);\n          this.set(ViewProperty.CENTER, [x, y]);\n        }\n        if (animation.sourceResolution && animation.targetResolution) {\n          const resolution = progress === 1 ?\n            animation.targetResolution :\n            animation.sourceResolution + progress * (animation.targetResolution - animation.sourceResolution);\n          if (animation.anchor) {\n            this.set(ViewProperty.CENTER,\n              this.calculateCenterZoom(resolution, animation.anchor));\n          }\n          this.set(ViewProperty.RESOLUTION, resolution);\n        }\n        if (animation.sourceRotation !== undefined && animation.targetRotation !== undefined) {\n          const rotation = progress === 1 ?\n            modulo(animation.targetRotation + Math.PI, 2 * Math.PI) - Math.PI :\n            animation.sourceRotation + progress * (animation.targetRotation - animation.sourceRotation);\n          if (animation.anchor) {\n            this.set(ViewProperty.CENTER,\n              this.calculateCenterRotate(rotation, animation.anchor));\n          }\n          this.set(ViewProperty.ROTATION, rotation);\n        }\n        more = true;\n        if (!animation.complete) {\n          break;\n        }\n      }\n      if (seriesComplete) {\n        this.animations_[i] = null;\n        this.setHint(ViewHint.ANIMATING, -1);\n        const callback = series[0].callback;\n        if (callback) {\n          animationCallback(callback, true);\n        }\n      }\n    }\n    // prune completed series\n    this.animations_ = this.animations_.filter(Boolean);\n    if (more && this.updateAnimationKey_ === undefined) {\n      this.updateAnimationKey_ = requestAnimationFrame(this.updateAnimations_);\n    }\n  }\n\n  /**\n   * @param {number} rotation Target rotation.\n   * @param {module:ol/coordinate~Coordinate} anchor Rotation anchor.\n   * @return {module:ol/coordinate~Coordinate|undefined} Center for rotation and anchor.\n   */\n  calculateCenterRotate(rotation, anchor) {\n    let center;\n    const currentCenter = this.getCenter();\n    if (currentCenter !== undefined) {\n      center = [currentCenter[0] - anchor[0], currentCenter[1] - anchor[1]];\n      rotateCoordinate(center, rotation - this.getRotation());\n      addCoordinate(center, anchor);\n    }\n    return center;\n  }\n\n  /**\n   * @param {number} resolution Target resolution.\n   * @param {module:ol/coordinate~Coordinate} anchor Zoom anchor.\n   * @return {module:ol/coordinate~Coordinate|undefined} Center for resolution and anchor.\n   */\n  calculateCenterZoom(resolution, anchor) {\n    let center;\n    const currentCenter = this.getCenter();\n    const currentResolution = this.getResolution();\n    if (currentCenter !== undefined && currentResolution !== undefined) {\n      const x = anchor[0] - resolution * (anchor[0] - currentCenter[0]) / currentResolution;\n      const y = anchor[1] - resolution * (anchor[1] - currentCenter[1]) / currentResolution;\n      center = [x, y];\n    }\n    return center;\n  }\n\n  /**\n   * @private\n   * @return {module:ol/size~Size} Viewport size or `[100, 100]` when no viewport is found.\n   */\n  getSizeFromViewport_() {\n    const size = [100, 100];\n    const selector = '.ol-viewport[data-view=\"' + getUid(this) + '\"]';\n    const element = document.querySelector(selector);\n    if (element) {\n      const metrics = getComputedStyle(element);\n      size[0] = parseInt(metrics.width, 10);\n      size[1] = parseInt(metrics.height, 10);\n    }\n    return size;\n  }\n\n  /**\n   * Get the constrained center of this view.\n   * @param {module:ol/coordinate~Coordinate|undefined} center Center.\n   * @return {module:ol/coordinate~Coordinate|undefined} Constrained center.\n   * @api\n   */\n  constrainCenter(center) {\n    return this.constraints_.center(center);\n  }\n\n  /**\n   * Get the constrained resolution of this view.\n   * @param {number|undefined} resolution Resolution.\n   * @param {number=} opt_delta Delta. Default is `0`.\n   * @param {number=} opt_direction Direction. Default is `0`.\n   * @return {number|undefined} Constrained resolution.\n   * @api\n   */\n  constrainResolution(resolution, opt_delta, opt_direction) {\n    const delta = opt_delta || 0;\n    const direction = opt_direction || 0;\n    return this.constraints_.resolution(resolution, delta, direction);\n  }\n\n  /**\n   * Get the constrained rotation of this view.\n   * @param {number|undefined} rotation Rotation.\n   * @param {number=} opt_delta Delta. Default is `0`.\n   * @return {number|undefined} Constrained rotation.\n   * @api\n   */\n  constrainRotation(rotation, opt_delta) {\n    const delta = opt_delta || 0;\n    return this.constraints_.rotation(rotation, delta);\n  }\n\n  /**\n   * Get the view center.\n   * @return {module:ol/coordinate~Coordinate|undefined} The center of the view.\n   * @observable\n   * @api\n   */\n  getCenter() {\n    return (\n      /** @type {module:ol/coordinate~Coordinate|undefined} */ (this.get(ViewProperty.CENTER))\n    );\n  }\n\n  /**\n   * @return {module:ol/View~Constraints} Constraints.\n   */\n  getConstraints() {\n    return this.constraints_;\n  }\n\n  /**\n   * @param {Array<number>=} opt_hints Destination array.\n   * @return {Array<number>} Hint.\n   */\n  getHints(opt_hints) {\n    if (opt_hints !== undefined) {\n      opt_hints[0] = this.hints_[0];\n      opt_hints[1] = this.hints_[1];\n      return opt_hints;\n    } else {\n      return this.hints_.slice();\n    }\n  }\n\n  /**\n   * Calculate the extent for the current view state and the passed size.\n   * The size is the pixel dimensions of the box into which the calculated extent\n   * should fit. In most cases you want to get the extent of the entire map,\n   * that is `map.getSize()`.\n   * @param {module:ol/size~Size=} opt_size Box pixel size. If not provided, the size of the\n   * first map that uses this view will be used.\n   * @return {module:ol/extent~Extent} Extent.\n   * @api\n   */\n  calculateExtent(opt_size) {\n    const size = opt_size || this.getSizeFromViewport_();\n    const center = /** @type {!module:ol/coordinate~Coordinate} */ (this.getCenter());\n    assert(center, 1); // The view center is not defined\n    const resolution = /** @type {!number} */ (this.getResolution());\n    assert(resolution !== undefined, 2); // The view resolution is not defined\n    const rotation = /** @type {!number} */ (this.getRotation());\n    assert(rotation !== undefined, 3); // The view rotation is not defined\n\n    return getForViewAndSize(center, resolution, rotation, size);\n  }\n\n  /**\n   * Get the maximum resolution of the view.\n   * @return {number} The maximum resolution of the view.\n   * @api\n   */\n  getMaxResolution() {\n    return this.maxResolution_;\n  }\n\n  /**\n   * Get the minimum resolution of the view.\n   * @return {number} The minimum resolution of the view.\n   * @api\n   */\n  getMinResolution() {\n    return this.minResolution_;\n  }\n\n  /**\n   * Get the maximum zoom level for the view.\n   * @return {number} The maximum zoom level.\n   * @api\n   */\n  getMaxZoom() {\n    return /** @type {number} */ (this.getZoomForResolution(this.minResolution_));\n  }\n\n  /**\n   * Set a new maximum zoom level for the view.\n   * @param {number} zoom The maximum zoom level.\n   * @api\n   */\n  setMaxZoom(zoom) {\n    this.applyOptions_(this.getUpdatedOptions_({maxZoom: zoom}));\n  }\n\n  /**\n   * Get the minimum zoom level for the view.\n   * @return {number} The minimum zoom level.\n   * @api\n   */\n  getMinZoom() {\n    return /** @type {number} */ (this.getZoomForResolution(this.maxResolution_));\n  }\n\n  /**\n   * Set a new minimum zoom level for the view.\n   * @param {number} zoom The minimum zoom level.\n   * @api\n   */\n  setMinZoom(zoom) {\n    this.applyOptions_(this.getUpdatedOptions_({minZoom: zoom}));\n  }\n\n  /**\n   * Get the view projection.\n   * @return {module:ol/proj/Projection} The projection of the view.\n   * @api\n   */\n  getProjection() {\n    return this.projection_;\n  }\n\n  /**\n   * Get the view resolution.\n   * @return {number|undefined} The resolution of the view.\n   * @observable\n   * @api\n   */\n  getResolution() {\n    return /** @type {number|undefined} */ (this.get(ViewProperty.RESOLUTION));\n  }\n\n  /**\n   * Get the resolutions for the view. This returns the array of resolutions\n   * passed to the constructor of the View, or undefined if none were given.\n   * @return {Array<number>|undefined} The resolutions of the view.\n   * @api\n   */\n  getResolutions() {\n    return this.resolutions_;\n  }\n\n  /**\n   * Get the resolution for a provided extent (in map units) and size (in pixels).\n   * @param {module:ol/extent~Extent} extent Extent.\n   * @param {module:ol/size~Size=} opt_size Box pixel size.\n   * @return {number} The resolution at which the provided extent will render at\n   *     the given size.\n   * @api\n   */\n  getResolutionForExtent(extent, opt_size) {\n    const size = opt_size || this.getSizeFromViewport_();\n    const xResolution = getWidth(extent) / size[0];\n    const yResolution = getHeight(extent) / size[1];\n    return Math.max(xResolution, yResolution);\n  }\n\n  /**\n   * Return a function that returns a value between 0 and 1 for a\n   * resolution. Exponential scaling is assumed.\n   * @param {number=} opt_power Power.\n   * @return {function(number): number} Resolution for value function.\n   */\n  getResolutionForValueFunction(opt_power) {\n    const power = opt_power || 2;\n    const maxResolution = this.maxResolution_;\n    const minResolution = this.minResolution_;\n    const max = Math.log(maxResolution / minResolution) / Math.log(power);\n    return (\n      /**\n       * @param {number} value Value.\n       * @return {number} Resolution.\n       */\n      function(value) {\n        const resolution = maxResolution / Math.pow(power, value * max);\n        return resolution;\n      });\n  }\n\n  /**\n   * Get the view rotation.\n   * @return {number} The rotation of the view in radians.\n   * @observable\n   * @api\n   */\n  getRotation() {\n    return /** @type {number} */ (this.get(ViewProperty.ROTATION));\n  }\n\n  /**\n   * Return a function that returns a resolution for a value between\n   * 0 and 1. Exponential scaling is assumed.\n   * @param {number=} opt_power Power.\n   * @return {function(number): number} Value for resolution function.\n   */\n  getValueForResolutionFunction(opt_power) {\n    const power = opt_power || 2;\n    const maxResolution = this.maxResolution_;\n    const minResolution = this.minResolution_;\n    const max = Math.log(maxResolution / minResolution) / Math.log(power);\n    return (\n      /**\n       * @param {number} resolution Resolution.\n       * @return {number} Value.\n       */\n      function(resolution) {\n        const value = (Math.log(maxResolution / resolution) / Math.log(power)) / max;\n        return value;\n      });\n  }\n\n  /**\n   * @param {number} pixelRatio Pixel ratio for center rounding.\n   * @return {module:ol/View~State} View state.\n   */\n  getState(pixelRatio) {\n    const center = /** @type {module:ol/coordinate~Coordinate} */ (this.getCenter());\n    const projection = this.getProjection();\n    const resolution = /** @type {number} */ (this.getResolution());\n    const pixelResolution = resolution / pixelRatio;\n    const rotation = this.getRotation();\n    return (\n      /** @type {module:ol/View~State} */ ({\n        center: [\n          Math.round(center[0] / pixelResolution) * pixelResolution,\n          Math.round(center[1] / pixelResolution) * pixelResolution\n        ],\n        projection: projection !== undefined ? projection : null,\n        resolution: resolution,\n        rotation: rotation,\n        zoom: this.getZoom()\n      })\n    );\n  }\n\n  /**\n   * Get the current zoom level.  If you configured your view with a resolutions\n   * array (this is rare), this method may return non-integer zoom levels (so\n   * the zoom level is not safe to use as an index into a resolutions array).\n   * @return {number|undefined} Zoom.\n   * @api\n   */\n  getZoom() {\n    let zoom;\n    const resolution = this.getResolution();\n    if (resolution !== undefined) {\n      zoom = this.getZoomForResolution(resolution);\n    }\n    return zoom;\n  }\n\n  /**\n   * Get the zoom level for a resolution.\n   * @param {number} resolution The resolution.\n   * @return {number|undefined} The zoom level for the provided resolution.\n   * @api\n   */\n  getZoomForResolution(resolution) {\n    let offset = this.minZoom_ || 0;\n    let max, zoomFactor;\n    if (this.resolutions_) {\n      const nearest = linearFindNearest(this.resolutions_, resolution, 1);\n      offset = nearest;\n      max = this.resolutions_[nearest];\n      if (nearest == this.resolutions_.length - 1) {\n        zoomFactor = 2;\n      } else {\n        zoomFactor = max / this.resolutions_[nearest + 1];\n      }\n    } else {\n      max = this.maxResolution_;\n      zoomFactor = this.zoomFactor_;\n    }\n    return offset + Math.log(max / resolution) / Math.log(zoomFactor);\n  }\n\n  /**\n   * Get the resolution for a zoom level.\n   * @param {number} zoom Zoom level.\n   * @return {number} The view resolution for the provided zoom level.\n   * @api\n   */\n  getResolutionForZoom(zoom) {\n    return /** @type {number} */ (this.constrainResolution(\n      this.maxResolution_, zoom - this.minZoom_, 0));\n  }\n\n  /**\n   * Fit the given geometry or extent based on the given map size and border.\n   * The size is pixel dimensions of the box to fit the extent into.\n   * In most cases you will want to use the map size, that is `map.getSize()`.\n   * Takes care of the map angle.\n   * @param {module:ol/geom/SimpleGeometry|module:ol/extent~Extent} geometryOrExtent The geometry or\n   *     extent to fit the view to.\n   * @param {module:ol/View~FitOptions=} opt_options Options.\n   * @api\n   */\n  fit(geometryOrExtent, opt_options) {\n    const options = opt_options || {};\n    let size = options.size;\n    if (!size) {\n      size = this.getSizeFromViewport_();\n    }\n    /** @type {module:ol/geom/SimpleGeometry} */\n    let geometry;\n    if (!(geometryOrExtent instanceof SimpleGeometry)) {\n      assert(Array.isArray(geometryOrExtent),\n        24); // Invalid extent or geometry provided as `geometry`\n      assert(!isEmpty(geometryOrExtent),\n        25); // Cannot fit empty extent provided as `geometry`\n      geometry = polygonFromExtent(geometryOrExtent);\n    } else if (geometryOrExtent.getType() === GeometryType.CIRCLE) {\n      geometryOrExtent = geometryOrExtent.getExtent();\n      geometry = polygonFromExtent(geometryOrExtent);\n      geometry.rotate(this.getRotation(), getCenter(geometryOrExtent));\n    } else {\n      geometry = geometryOrExtent;\n    }\n\n    const padding = options.padding !== undefined ? options.padding : [0, 0, 0, 0];\n    const constrainResolution = options.constrainResolution !== undefined ?\n      options.constrainResolution : true;\n    const nearest = options.nearest !== undefined ? options.nearest : false;\n    let minResolution;\n    if (options.minResolution !== undefined) {\n      minResolution = options.minResolution;\n    } else if (options.maxZoom !== undefined) {\n      minResolution = this.constrainResolution(\n        this.maxResolution_, options.maxZoom - this.minZoom_, 0);\n    } else {\n      minResolution = 0;\n    }\n    const coords = geometry.getFlatCoordinates();\n\n    // calculate rotated extent\n    const rotation = this.getRotation();\n    const cosAngle = Math.cos(-rotation);\n    let sinAngle = Math.sin(-rotation);\n    let minRotX = +Infinity;\n    let minRotY = +Infinity;\n    let maxRotX = -Infinity;\n    let maxRotY = -Infinity;\n    const stride = geometry.getStride();\n    for (let i = 0, ii = coords.length; i < ii; i += stride) {\n      const rotX = coords[i] * cosAngle - coords[i + 1] * sinAngle;\n      const rotY = coords[i] * sinAngle + coords[i + 1] * cosAngle;\n      minRotX = Math.min(minRotX, rotX);\n      minRotY = Math.min(minRotY, rotY);\n      maxRotX = Math.max(maxRotX, rotX);\n      maxRotY = Math.max(maxRotY, rotY);\n    }\n\n    // calculate resolution\n    let resolution = this.getResolutionForExtent(\n      [minRotX, minRotY, maxRotX, maxRotY],\n      [size[0] - padding[1] - padding[3], size[1] - padding[0] - padding[2]]);\n    resolution = isNaN(resolution) ? minResolution :\n      Math.max(resolution, minResolution);\n    if (constrainResolution) {\n      let constrainedResolution = this.constrainResolution(resolution, 0, 0);\n      if (!nearest && constrainedResolution < resolution) {\n        constrainedResolution = this.constrainResolution(\n          constrainedResolution, -1, 0);\n      }\n      resolution = constrainedResolution;\n    }\n\n    // calculate center\n    sinAngle = -sinAngle; // go back to original rotation\n    let centerRotX = (minRotX + maxRotX) / 2;\n    let centerRotY = (minRotY + maxRotY) / 2;\n    centerRotX += (padding[1] - padding[3]) / 2 * resolution;\n    centerRotY += (padding[0] - padding[2]) / 2 * resolution;\n    const centerX = centerRotX * cosAngle - centerRotY * sinAngle;\n    const centerY = centerRotY * cosAngle + centerRotX * sinAngle;\n    const center = [centerX, centerY];\n    const callback = options.callback ? options.callback : VOID;\n\n    if (options.duration !== undefined) {\n      this.animate({\n        resolution: resolution,\n        center: center,\n        duration: options.duration,\n        easing: options.easing\n      }, callback);\n    } else {\n      this.setResolution(resolution);\n      this.setCenter(center);\n      animationCallback(callback, true);\n    }\n  }\n\n  /**\n   * Center on coordinate and view position.\n   * @param {module:ol/coordinate~Coordinate} coordinate Coordinate.\n   * @param {module:ol/size~Size} size Box pixel size.\n   * @param {module:ol/pixel~Pixel} position Position on the view to center on.\n   * @api\n   */\n  centerOn(coordinate, size, position) {\n    // calculate rotated position\n    const rotation = this.getRotation();\n    const cosAngle = Math.cos(-rotation);\n    let sinAngle = Math.sin(-rotation);\n    let rotX = coordinate[0] * cosAngle - coordinate[1] * sinAngle;\n    let rotY = coordinate[1] * cosAngle + coordinate[0] * sinAngle;\n    const resolution = this.getResolution();\n    rotX += (size[0] / 2 - position[0]) * resolution;\n    rotY += (position[1] - size[1] / 2) * resolution;\n\n    // go back to original angle\n    sinAngle = -sinAngle; // go back to original rotation\n    const centerX = rotX * cosAngle - rotY * sinAngle;\n    const centerY = rotY * cosAngle + rotX * sinAngle;\n\n    this.setCenter([centerX, centerY]);\n  }\n\n  /**\n   * @return {boolean} Is defined.\n   */\n  isDef() {\n    return !!this.getCenter() && this.getResolution() !== undefined;\n  }\n\n  /**\n   * Rotate the view around a given coordinate.\n   * @param {number} rotation New rotation value for the view.\n   * @param {module:ol/coordinate~Coordinate=} opt_anchor The rotation center.\n   * @api\n   */\n  rotate(rotation, opt_anchor) {\n    if (opt_anchor !== undefined) {\n      const center = this.calculateCenterRotate(rotation, opt_anchor);\n      this.setCenter(center);\n    }\n    this.setRotation(rotation);\n  }\n\n  /**\n   * Set the center of the current view.\n   * @param {module:ol/coordinate~Coordinate|undefined} center The center of the view.\n   * @observable\n   * @api\n   */\n  setCenter(center) {\n    this.set(ViewProperty.CENTER, center);\n    if (this.getAnimating()) {\n      this.cancelAnimations();\n    }\n  }\n\n  /**\n   * @param {module:ol/ViewHint} hint Hint.\n   * @param {number} delta Delta.\n   * @return {number} New value.\n   */\n  setHint(hint, delta) {\n    this.hints_[hint] += delta;\n    this.changed();\n    return this.hints_[hint];\n  }\n\n  /**\n   * Set the resolution for this view.\n   * @param {number|undefined} resolution The resolution of the view.\n   * @observable\n   * @api\n   */\n  setResolution(resolution) {\n    this.set(ViewProperty.RESOLUTION, resolution);\n    if (this.getAnimating()) {\n      this.cancelAnimations();\n    }\n  }\n\n  /**\n   * Set the rotation for this view.\n   * @param {number} rotation The rotation of the view in radians.\n   * @observable\n   * @api\n   */\n  setRotation(rotation) {\n    this.set(ViewProperty.ROTATION, rotation);\n    if (this.getAnimating()) {\n      this.cancelAnimations();\n    }\n  }\n\n  /**\n   * Zoom to a specific zoom level.\n   * @param {number} zoom Zoom level.\n   * @api\n   */\n  setZoom(zoom) {\n    this.setResolution(this.getResolutionForZoom(zoom));\n  }\n}\n\n\n/**\n * @param {Function} callback Callback.\n * @param {*} returnValue Return value.\n */\nfunction animationCallback(callback, returnValue) {\n  setTimeout(function() {\n    callback(returnValue);\n  }, 0);\n}\n\n\n/**\n * @param {module:ol/View~ViewOptions} options View options.\n * @return {module:ol/centerconstraint~Type} The constraint.\n */\nexport function createCenterConstraint(options) {\n  if (options.extent !== undefined) {\n    return createExtent(options.extent);\n  } else {\n    return centerNone;\n  }\n}\n\n\n/**\n * @param {module:ol/View~ViewOptions} options View options.\n * @return {{constraint: module:ol/resolutionconstraint~Type, maxResolution: number,\n *     minResolution: number, minZoom: number, zoomFactor: number}} The constraint.\n */\nexport function createResolutionConstraint(options) {\n  let resolutionConstraint;\n  let maxResolution;\n  let minResolution;\n\n  // TODO: move these to be ol constants\n  // see https://github.com/openlayers/openlayers/issues/2076\n  const defaultMaxZoom = 28;\n  const defaultZoomFactor = 2;\n\n  let minZoom = options.minZoom !== undefined ?\n    options.minZoom : DEFAULT_MIN_ZOOM;\n\n  let maxZoom = options.maxZoom !== undefined ?\n    options.maxZoom : defaultMaxZoom;\n\n  const zoomFactor = options.zoomFactor !== undefined ?\n    options.zoomFactor : defaultZoomFactor;\n\n  if (options.resolutions !== undefined) {\n    const resolutions = options.resolutions;\n    maxResolution = resolutions[minZoom];\n    minResolution = resolutions[maxZoom] !== undefined ?\n      resolutions[maxZoom] : resolutions[resolutions.length - 1];\n    resolutionConstraint = createSnapToResolutions(\n      resolutions);\n  } else {\n    // calculate the default min and max resolution\n    const projection = createProjection(options.projection, 'EPSG:3857');\n    const extent = projection.getExtent();\n    const size = !extent ?\n      // use an extent that can fit the whole world if need be\n      360 * METERS_PER_UNIT[Units.DEGREES] /\n            projection.getMetersPerUnit() :\n      Math.max(getWidth(extent), getHeight(extent));\n\n    const defaultMaxResolution = size / DEFAULT_TILE_SIZE / Math.pow(\n      defaultZoomFactor, DEFAULT_MIN_ZOOM);\n\n    const defaultMinResolution = defaultMaxResolution / Math.pow(\n      defaultZoomFactor, defaultMaxZoom - DEFAULT_MIN_ZOOM);\n\n    // user provided maxResolution takes precedence\n    maxResolution = options.maxResolution;\n    if (maxResolution !== undefined) {\n      minZoom = 0;\n    } else {\n      maxResolution = defaultMaxResolution / Math.pow(zoomFactor, minZoom);\n    }\n\n    // user provided minResolution takes precedence\n    minResolution = options.minResolution;\n    if (minResolution === undefined) {\n      if (options.maxZoom !== undefined) {\n        if (options.maxResolution !== undefined) {\n          minResolution = maxResolution / Math.pow(zoomFactor, maxZoom);\n        } else {\n          minResolution = defaultMaxResolution / Math.pow(zoomFactor, maxZoom);\n        }\n      } else {\n        minResolution = defaultMinResolution;\n      }\n    }\n\n    // given discrete zoom levels, minResolution may be different than provided\n    maxZoom = minZoom + Math.floor(\n      Math.log(maxResolution / minResolution) / Math.log(zoomFactor));\n    minResolution = maxResolution / Math.pow(zoomFactor, maxZoom - minZoom);\n\n    resolutionConstraint = createSnapToPower(\n      zoomFactor, maxResolution, maxZoom - minZoom);\n  }\n  return {constraint: resolutionConstraint, maxResolution: maxResolution,\n    minResolution: minResolution, minZoom: minZoom, zoomFactor: zoomFactor};\n}\n\n\n/**\n * @param {module:ol/View~ViewOptions} options View options.\n * @return {module:ol/rotationconstraint~Type} Rotation constraint.\n */\nexport function createRotationConstraint(options) {\n  const enableRotation = options.enableRotation !== undefined ?\n    options.enableRotation : true;\n  if (enableRotation) {\n    const constrainRotation = options.constrainRotation;\n    if (constrainRotation === undefined || constrainRotation === true) {\n      return createSnapToZero();\n    } else if (constrainRotation === false) {\n      return rotationNone;\n    } else if (typeof constrainRotation === 'number') {\n      return createSnapToN(constrainRotation);\n    } else {\n      return rotationNone;\n    }\n  } else {\n    return disable;\n  }\n}\n\n\n/**\n * Determine if an animation involves no view change.\n * @param {module:ol/View~Animation} animation The animation.\n * @return {boolean} The animation involves no view change.\n */\nexport function isNoopAnimation(animation) {\n  if (animation.sourceCenter && animation.targetCenter) {\n    if (!coordinatesEqual(animation.sourceCenter, animation.targetCenter)) {\n      return false;\n    }\n  }\n  if (animation.sourceResolution !== animation.targetResolution) {\n    return false;\n  }\n  if (animation.sourceRotation !== animation.targetRotation) {\n    return false;\n  }\n  return true;\n}\n\nexport default View;\n","/**\n * @module ol/resolutionconstraint\n */\nimport {linearFindNearest} from './array.js';\nimport {clamp} from './math.js';\n\n\n/**\n * @typedef {function((number|undefined), number, number): (number|undefined)} Type\n */\n\n\n/**\n * @param {Array<number>} resolutions Resolutions.\n * @return {module:ol/resolutionconstraint~Type} Zoom function.\n */\nexport function createSnapToResolutions(resolutions) {\n  return (\n    /**\n     * @param {number|undefined} resolution Resolution.\n     * @param {number} delta Delta.\n     * @param {number} direction Direction.\n     * @return {number|undefined} Resolution.\n     */\n    function(resolution, delta, direction) {\n      if (resolution !== undefined) {\n        let z = linearFindNearest(resolutions, resolution, direction);\n        z = clamp(z + delta, 0, resolutions.length - 1);\n        const index = Math.floor(z);\n        if (z != index && index < resolutions.length - 1) {\n          const power = resolutions[index] / resolutions[index + 1];\n          return resolutions[index] / Math.pow(power, z - index);\n        } else {\n          return resolutions[index];\n        }\n      } else {\n        return undefined;\n      }\n    }\n  );\n}\n\n\n/**\n * @param {number} power Power.\n * @param {number} maxResolution Maximum resolution.\n * @param {number=} opt_maxLevel Maximum level.\n * @return {module:ol/resolutionconstraint~Type} Zoom function.\n */\nexport function createSnapToPower(power, maxResolution, opt_maxLevel) {\n  return (\n    /**\n     * @param {number|undefined} resolution Resolution.\n     * @param {number} delta Delta.\n     * @param {number} direction Direction.\n     * @return {number|undefined} Resolution.\n     */\n    function(resolution, delta, direction) {\n      if (resolution !== undefined) {\n        const offset = -direction / 2 + 0.5;\n        const oldLevel = Math.floor(\n          Math.log(maxResolution / resolution) / Math.log(power) + offset);\n        let newLevel = Math.max(oldLevel + delta, 0);\n        if (opt_maxLevel !== undefined) {\n          newLevel = Math.min(newLevel, opt_maxLevel);\n        }\n        return maxResolution / Math.pow(power, newLevel);\n      } else {\n        return undefined;\n      }\n    });\n}\n","var g;\n\n// This works in non-strict mode\ng = (function() {\n\treturn this;\n})();\n\ntry {\n\t// This works if eval is allowed (see CSP)\n\tg = g || Function(\"return this\")() || (1, eval)(\"this\");\n} catch (e) {\n\t// This works if the window reference is available\n\tif (typeof window === \"object\") g = window;\n}\n\n// g can still be undefined, but nothing to do about it...\n// We return undefined, instead of nothing here, so it's\n// easier to handle this case. if(!global) { ...}\n\nmodule.exports = g;\n","exports.read = function (buffer, offset, isLE, mLen, nBytes) {\n  var e, m\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var nBits = -7\n  var i = isLE ? (nBytes - 1) : 0\n  var d = isLE ? -1 : 1\n  var s = buffer[offset + i]\n\n  i += d\n\n  e = s & ((1 << (-nBits)) - 1)\n  s >>= (-nBits)\n  nBits += eLen\n  for (; nBits > 0; e = (e * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  m = e & ((1 << (-nBits)) - 1)\n  e >>= (-nBits)\n  nBits += mLen\n  for (; nBits > 0; m = (m * 256) + buffer[offset + i], i += d, nBits -= 8) {}\n\n  if (e === 0) {\n    e = 1 - eBias\n  } else if (e === eMax) {\n    return m ? NaN : ((s ? -1 : 1) * Infinity)\n  } else {\n    m = m + Math.pow(2, mLen)\n    e = e - eBias\n  }\n  return (s ? -1 : 1) * m * Math.pow(2, e - mLen)\n}\n\nexports.write = function (buffer, value, offset, isLE, mLen, nBytes) {\n  var e, m, c\n  var eLen = (nBytes * 8) - mLen - 1\n  var eMax = (1 << eLen) - 1\n  var eBias = eMax >> 1\n  var rt = (mLen === 23 ? Math.pow(2, -24) - Math.pow(2, -77) : 0)\n  var i = isLE ? 0 : (nBytes - 1)\n  var d = isLE ? 1 : -1\n  var s = value < 0 || (value === 0 && 1 / value < 0) ? 1 : 0\n\n  value = Math.abs(value)\n\n  if (isNaN(value) || value === Infinity) {\n    m = isNaN(value) ? 1 : 0\n    e = eMax\n  } else {\n    e = Math.floor(Math.log(value) / Math.LN2)\n    if (value * (c = Math.pow(2, -e)) < 1) {\n      e--\n      c *= 2\n    }\n    if (e + eBias >= 1) {\n      value += rt / c\n    } else {\n      value += rt * Math.pow(2, 1 - eBias)\n    }\n    if (value * c >= 2) {\n      e++\n      c /= 2\n    }\n\n    if (e + eBias >= eMax) {\n      m = 0\n      e = eMax\n    } else if (e + eBias >= 1) {\n      m = ((value * c) - 1) * Math.pow(2, mLen)\n      e = e + eBias\n    } else {\n      m = value * Math.pow(2, eBias - 1) * Math.pow(2, mLen)\n      e = 0\n    }\n  }\n\n  for (; mLen >= 8; buffer[offset + i] = m & 0xff, i += d, m /= 256, mLen -= 8) {}\n\n  e = (e << mLen) | m\n  eLen += mLen\n  for (; eLen > 0; buffer[offset + i] = e & 0xff, i += d, e /= 256, eLen -= 8) {}\n\n  buffer[offset + i - d] |= s * 128\n}\n","// Generated by CoffeeScript 1.10.0\n(function() {\n  var families;\n\n  module.exports = {\n    icon: 'icons/google.svg',\n    name: 'google',\n    title: 'Google Fonts',\n    link: 'google.com/fonts',\n    getNames: function() {\n      return families;\n    },\n    getLink: function(name) {\n      return \"https://fonts.google.com/specimen/\" + (name.replace(/( )/g, '+'));\n    },\n    normalizeName: function(name) {\n      return name;\n    }\n  };\n\n  families = [\"ABeeZee\", \"Abel\", \"Abril Fatface\", \"Aclonica\", \"Acme\", \"Actor\", \"Adamina\", \"Advent Pro\", \"Aguafina Script\", \"Akronim\", \"Aladin\", \"Aldrich\", \"Alef\", \"Alegreya\", \"Alegreya SC\", \"Alegreya Sans\", \"Alegreya Sans SC\", \"Alex Brush\", \"Alfa Slab One\", \"Alice\", \"Alike\", \"Alike Angular\", \"Allan\", \"Allerta\", \"Allerta Stencil\", \"Allura\", \"Almendra\", \"Almendra Display\", \"Almendra SC\", \"Amarante\", \"Amaranth\", \"Amatic SC\", \"Amethysta\", \"Amiri\", \"Amita\", \"Anaheim\", \"Andada\", \"Andika\", \"Angkor\", \"Annie Use Your Telescope\", \"Anonymous Pro\", \"Antic\", \"Antic Didone\", \"Antic Slab\", \"Anton\", \"Arapey\", \"Arbutus\", \"Arbutus Slab\", \"Architects Daughter\", \"Archivo Black\", \"Archivo Narrow\", \"Arimo\", \"Arizonia\", \"Armata\", \"Artifika\", \"Arvo\", \"Arya\", \"Asap\", \"Asar\", \"Asset\", \"Astloch\", \"Asul\", \"Atomic Age\", \"Aubrey\", \"Audiowide\", \"Autour One\", \"Average\", \"Average Sans\", \"Averia Gruesa Libre\", \"Averia Libre\", \"Averia Sans Libre\", \"Averia Serif Libre\", \"Bad Script\", \"Balthazar\", \"Bangers\", \"Basic\", \"Battambang\", \"Baumans\", \"Bayon\", \"Belgrano\", \"Belleza\", \"BenchNine\", \"Bentham\", \"Berkshire Swash\", \"Bevan\", \"Bigelow Rules\", \"Bigshot One\", \"Bilbo\", \"Bilbo Swash Caps\", \"Biryani\", \"Bitter\", \"Black Ops One\", \"Bokor\", \"Bonbon\", \"Boogaloo\", \"Bowlby One\", \"Bowlby One SC\", \"Brawler\", \"Bree Serif\", \"Bubblegum Sans\", \"Bubbler One\", \"Buda\", \"Buenard\", \"Butcherman\", \"Butterfly Kids\", \"Cabin\", \"Cabin Condensed\", \"Cabin Sketch\", \"Caesar Dressing\", \"Cagliostro\", \"Calligraffitti\", \"Cambay\", \"Cambo\", \"Candal\", \"Cantarell\", \"Cantata One\", \"Cantora One\", \"Capriola\", \"Cardo\", \"Carme\", \"Carrois Gothic\", \"Carrois Gothic SC\", \"Carter One\", \"Catamaran\", \"Caudex\", \"Caveat\", \"Caveat Brush\", \"Cedarville Cursive\", \"Ceviche One\", \"Changa One\", \"Chango\", \"Chau Philomene One\", \"Chela One\", \"Chelsea Market\", \"Chenla\", \"Cherry Cream Soda\", \"Cherry Swash\", \"Chewy\", \"Chicle\", \"Chivo\", \"Chonburi\", \"Cinzel\", \"Cinzel Decorative\", \"Clicker Script\", \"Coda\", \"Coda Caption\", \"Codystar\", \"Combo\", \"Comfortaa\", \"Coming Soon\", \"Concert One\", \"Condiment\", \"Content\", \"Contrail One\", \"Convergence\", \"Cookie\", \"Copse\", \"Corben\", \"Courgette\", \"Cousine\", \"Coustard\", \"Covered By Your Grace\", \"Crafty Girls\", \"Creepster\", \"Crete Round\", \"Crimson Text\", \"Croissant One\", \"Crushed\", \"Cuprum\", \"Cutive\", \"Cutive Mono\", \"Damion\", \"Dancing Script\", \"Dangrek\", \"Dawning of a New Day\", \"Days One\", \"Dekko\", \"Delius\", \"Delius Swash Caps\", \"Delius Unicase\", \"Della Respira\", \"Denk One\", \"Devonshire\", \"Dhurjati\", \"Didact Gothic\", \"Diplomata\", \"Diplomata SC\", \"Domine\", \"Donegal One\", \"Doppio One\", \"Dorsa\", \"Dosis\", \"Dr Sugiyama\", \"Droid Sans\", \"Droid Sans Mono\", \"Droid Serif\", \"Duru Sans\", \"Dynalight\", \"EB Garamond\", \"Eagle Lake\", \"Eater\", \"Economica\", \"Eczar\", \"Ek Mukta\", \"Electrolize\", \"Elsie\", \"Elsie Swash Caps\", \"Emblema One\", \"Emilys Candy\", \"Engagement\", \"Englebert\", \"Enriqueta\", \"Erica One\", \"Esteban\", \"Euphoria Script\", \"Ewert\", \"Exo\", \"Exo 2\", \"Expletus Sans\", \"Fanwood Text\", \"Fascinate\", \"Fascinate Inline\", \"Faster One\", \"Fasthand\", \"Fauna One\", \"Federant\", \"Federo\", \"Felipa\", \"Fenix\", \"Finger Paint\", \"Fira Mono\", \"Fira Sans\", \"Fjalla One\", \"Fjord One\", \"Flamenco\", \"Flavors\", \"Fondamento\", \"Fontdiner Swanky\", \"Forum\", \"Francois One\", \"Freckle Face\", \"Fredericka the Great\", \"Fredoka One\", \"Freehand\", \"Fresca\", \"Frijole\", \"Fruktur\", \"Fugaz One\", \"GFS Didot\", \"GFS Neohellenic\", \"Gabriela\", \"Gafata\", \"Galdeano\", \"Galindo\", \"Gentium Basic\", \"Gentium Book Basic\", \"Geo\", \"Geostar\", \"Geostar Fill\", \"Germania One\", \"Gidugu\", \"Gilda Display\", \"Give You Glory\", \"Glass Antiqua\", \"Glegoo\", \"Gloria Hallelujah\", \"Goblin One\", \"Gochi Hand\", \"Gorditas\", \"Goudy Bookletter 1911\", \"Graduate\", \"Grand Hotel\", \"Gravitas One\", \"Great Vibes\", \"Griffy\", \"Gruppo\", \"Gudea\", \"Gurajada\", \"Habibi\", \"Halant\", \"Hammersmith One\", \"Hanalei\", \"Hanalei Fill\", \"Handlee\", \"Hanuman\", \"Happy Monkey\", \"Headland One\", \"Henny Penny\", \"Herr Von Muellerhoff\", \"Hind\", \"Hind Siliguri\", \"Hind Vadodara\", \"Holtwood One SC\", \"Homemade Apple\", \"Homenaje\", \"IM Fell DW Pica\", \"IM Fell DW Pica SC\", \"IM Fell Double Pica\", \"IM Fell Double Pica SC\", \"IM Fell English\", \"IM Fell English SC\", \"IM Fell French Canon\", \"IM Fell French Canon SC\", \"IM Fell Great Primer\", \"IM Fell Great Primer SC\", \"Iceberg\", \"Iceland\", \"Imprima\", \"Inconsolata\", \"Inder\", \"Indie Flower\", \"Inika\", \"Inknut Antiqua\", \"Irish Grover\", \"Istok Web\", \"Italiana\", \"Italianno\", \"Itim\", \"Jacques Francois\", \"Jacques Francois Shadow\", \"Jaldi\", \"Jim Nightshade\", \"Jockey One\", \"Jolly Lodger\", \"Josefin Sans\", \"Josefin Slab\", \"Joti One\", \"Judson\", \"Julee\", \"Julius Sans One\", \"Junge\", \"Jura\", \"Just Another Hand\", \"Just Me Again Down Here\", \"Kadwa\", \"Kalam\", \"Kameron\", \"Kantumruy\", \"Karla\", \"Karma\", \"Kaushan Script\", \"Kavoon\", \"Kdam Thmor\", \"Keania One\", \"Kelly Slab\", \"Kenia\", \"Khand\", \"Khmer\", \"Khula\", \"Kite One\", \"Knewave\", \"Kotta One\", \"Koulen\", \"Kranky\", \"Kreon\", \"Kristi\", \"Krona One\", \"Kurale\", \"La Belle Aurore\", \"Laila\", \"Lakki Reddy\", \"Lancelot\", \"Lateef\", \"Lato\", \"League Script\", \"Leckerli One\", \"Ledger\", \"Lekton\", \"Lemon\", \"Libre Baskerville\", \"Life Savers\", \"Lilita One\", \"Lily Script One\", \"Limelight\", \"Linden Hill\", \"Lobster\", \"Lobster Two\", \"Londrina Outline\", \"Londrina Shadow\", \"Londrina Sketch\", \"Londrina Solid\", \"Lora\", \"Love Ya Like A Sister\", \"Loved by the King\", \"Lovers Quarrel\", \"Luckiest Guy\", \"Lusitana\", \"Lustria\", \"Macondo\", \"Macondo Swash Caps\", \"Magra\", \"Maiden Orange\", \"Mako\", \"Mallanna\", \"Mandali\", \"Marcellus\", \"Marcellus SC\", \"Marck Script\", \"Margarine\", \"Marko One\", \"Marmelad\", \"Martel\", \"Martel Sans\", \"Marvel\", \"Mate\", \"Mate SC\", \"Maven Pro\", \"McLaren\", \"Meddon\", \"MedievalSharp\", \"Medula One\", \"Megrim\", \"Meie Script\", \"Merienda\", \"Merienda One\", \"Merriweather\", \"Merriweather Sans\", \"Metal\", \"Metal Mania\", \"Metamorphous\", \"Metrophobic\", \"Michroma\", \"Milonga\", \"Miltonian\", \"Miltonian Tattoo\", \"Miniver\", \"Miss Fajardose\", \"Modak\", \"Modern Antiqua\", \"Molengo\", \"Molle\", \"Monda\", \"Monofett\", \"Monoton\", \"Monsieur La Doulaise\", \"Montaga\", \"Montez\", \"Montserrat\", \"Montserrat Alternates\", \"Montserrat Subrayada\", \"Moul\", \"Moulpali\", \"Mountains of Christmas\", \"Mouse Memoirs\", \"Mr Bedfort\", \"Mr Dafoe\", \"Mr De Haviland\", \"Mrs Saint Delafield\", \"Mrs Sheppards\", \"Muli\", \"Mystery Quest\", \"NTR\", \"Neucha\", \"Neuton\", \"New Rocker\", \"News Cycle\", \"Niconne\", \"Nixie One\", \"Nobile\", \"Nokora\", \"Norican\", \"Nosifer\", \"Nothing You Could Do\", \"Noticia Text\", \"Noto Sans\", \"Noto Serif\", \"Nova Cut\", \"Nova Flat\", \"Nova Mono\", \"Nova Oval\", \"Nova Round\", \"Nova Script\", \"Nova Slim\", \"Nova Square\", \"Numans\", \"Nunito\", \"Odor Mean Chey\", \"Offside\", \"Old Standard TT\", \"Oldenburg\", \"Oleo Script\", \"Oleo Script Swash Caps\", \"Open Sans\", \"Open Sans Condensed\", \"Oranienbaum\", \"Orbitron\", \"Oregano\", \"Orienta\", \"Original Surfer\", \"Oswald\", \"Over the Rainbow\", \"Overlock\", \"Overlock SC\", \"Ovo\", \"Oxygen\", \"Oxygen Mono\", \"PT Mono\", \"PT Sans\", \"PT Sans Caption\", \"PT Sans Narrow\", \"PT Serif\", \"PT Serif Caption\", \"Pacifico\", \"Palanquin\", \"Palanquin Dark\", \"Paprika\", \"Parisienne\", \"Passero One\", \"Passion One\", \"Pathway Gothic One\", \"Patrick Hand\", \"Patrick Hand SC\", \"Patua One\", \"Paytone One\", \"Peddana\", \"Peralta\", \"Permanent Marker\", \"Petit Formal Script\", \"Petrona\", \"Philosopher\", \"Piedra\", \"Pinyon Script\", \"Pirata One\", \"Plaster\", \"Play\", \"Playball\", \"Playfair Display\", \"Playfair Display SC\", \"Podkova\", \"Poiret One\", \"Poller One\", \"Poly\", \"Pompiere\", \"Pontano Sans\", \"Poppins\", \"Port Lligat Sans\", \"Port Lligat Slab\", \"Pragati Narrow\", \"Prata\", \"Preahvihear\", \"Press Start 2P\", \"Princess Sofia\", \"Prociono\", \"Prosto One\", \"Puritan\", \"Purple Purse\", \"Quando\", \"Quantico\", \"Quattrocento\", \"Quattrocento Sans\", \"Questrial\", \"Quicksand\", \"Quintessential\", \"Qwigley\", \"Racing Sans One\", \"Radley\", \"Rajdhani\", \"Raleway\", \"Raleway Dots\", \"Ramabhadra\", \"Ramaraja\", \"Rambla\", \"Rammetto One\", \"Ranchers\", \"Rancho\", \"Ranga\", \"Rationale\", \"Ravi Prakash\", \"Redressed\", \"Reenie Beanie\", \"Revalia\", \"Rhodium Libre\", \"Ribeye\", \"Ribeye Marrow\", \"Righteous\", \"Risque\", \"Roboto\", \"Roboto Condensed\", \"Roboto Mono\", \"Roboto Slab\", \"Rochester\", \"Rock Salt\", \"Rokkitt\", \"Romanesco\", \"Ropa Sans\", \"Rosario\", \"Rosarivo\", \"Rouge Script\", \"Rozha One\", \"Rubik\", \"Rubik Mono One\", \"Rubik One\", \"Ruda\", \"Rufina\", \"Ruge Boogie\", \"Ruluko\", \"Rum Raisin\", \"Ruslan Display\", \"Russo One\", \"Ruthie\", \"Rye\", \"Sacramento\", \"Sahitya\", \"Sail\", \"Salsa\", \"Sanchez\", \"Sancreek\", \"Sansita One\", \"Sarala\", \"Sarina\", \"Sarpanch\", \"Satisfy\", \"Scada\", \"Scheherazade\", \"Schoolbell\", \"Seaweed Script\", \"Sevillana\", \"Seymour One\", \"Shadows Into Light\", \"Shadows Into Light Two\", \"Shanti\", \"Share\", \"Share Tech\", \"Share Tech Mono\", \"Shojumaru\", \"Short Stack\", \"Siemreap\", \"Sigmar One\", \"Signika\", \"Signika Negative\", \"Simonetta\", \"Sintony\", \"Sirin Stencil\", \"Six Caps\", \"Skranji\", \"Slabo 13px\", \"Slabo 27px\", \"Slackey\", \"Smokum\", \"Smythe\", \"Sniglet\", \"Snippet\", \"Snowburst One\", \"Sofadi One\", \"Sofia\", \"Sonsie One\", \"Sorts Mill Goudy\", \"Source Code Pro\", \"Source Sans Pro\", \"Source Serif Pro\", \"Special Elite\", \"Spicy Rice\", \"Spinnaker\", \"Spirax\", \"Squada One\", \"Sree Krushnadevaraya\", \"Stalemate\", \"Stalinist One\", \"Stardos Stencil\", \"Stint Ultra Condensed\", \"Stint Ultra Expanded\", \"Stoke\", \"Strait\", \"Sue Ellen Francisco\", \"Sumana\", \"Sunshiney\", \"Supermercado One\", \"Sura\", \"Suranna\", \"Suravaram\", \"Suwannaphum\", \"Swanky and Moo Moo\", \"Syncopate\", \"Tangerine\", \"Taprom\", \"Tauri\", \"Teko\", \"Telex\", \"Tenali Ramakrishna\", \"Tenor Sans\", \"Text Me One\", \"The Girl Next Door\", \"Tienne\", \"Tillana\", \"Timmana\", \"Tinos\", \"Titan One\", \"Titillium Web\", \"Trade Winds\", \"Trocchi\", \"Trochut\", \"Trykker\", \"Tulpen One\", \"Ubuntu\", \"Ubuntu Condensed\", \"Ubuntu Mono\", \"Ultra\", \"Uncial Antiqua\", \"Underdog\", \"Unica One\", \"UnifrakturCook\", \"UnifrakturMaguntia\", \"Unkempt\", \"Unlock\", \"Unna\", \"VT323\", \"Vampiro One\", \"Varela\", \"Varela Round\", \"Vast Shadow\", \"Vesper Libre\", \"Vibur\", \"Vidaloka\", \"Viga\", \"Voces\", \"Volkhov\", \"Vollkorn\", \"Voltaire\", \"Waiting for the Sunrise\", \"Wallpoet\", \"Walter Turncoat\", \"Warnes\", \"Wellfleet\", \"Wendy One\", \"Wire One\", \"Work Sans\", \"Yanone Kaffeesatz\", \"Yantramanav\", \"Yellowtail\", \"Yeseva One\", \"Yesteryear\", \"Zeyada\"];\n\n}).call(this);\n","'use strict';\n\nmodule.exports = Pbf;\n\nvar ieee754 = require('ieee754');\n\nfunction Pbf(buf) {\n    this.buf = ArrayBuffer.isView && ArrayBuffer.isView(buf) ? buf : new Uint8Array(buf || 0);\n    this.pos = 0;\n    this.type = 0;\n    this.length = this.buf.length;\n}\n\nPbf.Varint  = 0; // varint: int32, int64, uint32, uint64, sint32, sint64, bool, enum\nPbf.Fixed64 = 1; // 64-bit: double, fixed64, sfixed64\nPbf.Bytes   = 2; // length-delimited: string, bytes, embedded messages, packed repeated fields\nPbf.Fixed32 = 5; // 32-bit: float, fixed32, sfixed32\n\nvar SHIFT_LEFT_32 = (1 << 16) * (1 << 16),\n    SHIFT_RIGHT_32 = 1 / SHIFT_LEFT_32;\n\nPbf.prototype = {\n\n    destroy: function() {\n        this.buf = null;\n    },\n\n    // === READING =================================================================\n\n    readFields: function(readField, result, end) {\n        end = end || this.length;\n\n        while (this.pos < end) {\n            var val = this.readVarint(),\n                tag = val >> 3,\n                startPos = this.pos;\n\n            this.type = val & 0x7;\n            readField(tag, result, this);\n\n            if (this.pos === startPos) this.skip(val);\n        }\n        return result;\n    },\n\n    readMessage: function(readField, result) {\n        return this.readFields(readField, result, this.readVarint() + this.pos);\n    },\n\n    readFixed32: function() {\n        var val = readUInt32(this.buf, this.pos);\n        this.pos += 4;\n        return val;\n    },\n\n    readSFixed32: function() {\n        var val = readInt32(this.buf, this.pos);\n        this.pos += 4;\n        return val;\n    },\n\n    // 64-bit int handling is based on github.com/dpw/node-buffer-more-ints (MIT-licensed)\n\n    readFixed64: function() {\n        var val = readUInt32(this.buf, this.pos) + readUInt32(this.buf, this.pos + 4) * SHIFT_LEFT_32;\n        this.pos += 8;\n        return val;\n    },\n\n    readSFixed64: function() {\n        var val = readUInt32(this.buf, this.pos) + readInt32(this.buf, this.pos + 4) * SHIFT_LEFT_32;\n        this.pos += 8;\n        return val;\n    },\n\n    readFloat: function() {\n        var val = ieee754.read(this.buf, this.pos, true, 23, 4);\n        this.pos += 4;\n        return val;\n    },\n\n    readDouble: function() {\n        var val = ieee754.read(this.buf, this.pos, true, 52, 8);\n        this.pos += 8;\n        return val;\n    },\n\n    readVarint: function(isSigned) {\n        var buf = this.buf,\n            val, b;\n\n        b = buf[this.pos++]; val  =  b & 0x7f;        if (b < 0x80) return val;\n        b = buf[this.pos++]; val |= (b & 0x7f) << 7;  if (b < 0x80) return val;\n        b = buf[this.pos++]; val |= (b & 0x7f) << 14; if (b < 0x80) return val;\n        b = buf[this.pos++]; val |= (b & 0x7f) << 21; if (b < 0x80) return val;\n        b = buf[this.pos];   val |= (b & 0x0f) << 28;\n\n        return readVarintRemainder(val, isSigned, this);\n    },\n\n    readVarint64: function() { // for compatibility with v2.0.1\n        return this.readVarint(true);\n    },\n\n    readSVarint: function() {\n        var num = this.readVarint();\n        return num % 2 === 1 ? (num + 1) / -2 : num / 2; // zigzag encoding\n    },\n\n    readBoolean: function() {\n        return Boolean(this.readVarint());\n    },\n\n    readString: function() {\n        var end = this.readVarint() + this.pos,\n            str = readUtf8(this.buf, this.pos, end);\n        this.pos = end;\n        return str;\n    },\n\n    readBytes: function() {\n        var end = this.readVarint() + this.pos,\n            buffer = this.buf.subarray(this.pos, end);\n        this.pos = end;\n        return buffer;\n    },\n\n    // verbose for performance reasons; doesn't affect gzipped size\n\n    readPackedVarint: function(arr, isSigned) {\n        var end = readPackedEnd(this);\n        arr = arr || [];\n        while (this.pos < end) arr.push(this.readVarint(isSigned));\n        return arr;\n    },\n    readPackedSVarint: function(arr) {\n        var end = readPackedEnd(this);\n        arr = arr || [];\n        while (this.pos < end) arr.push(this.readSVarint());\n        return arr;\n    },\n    readPackedBoolean: function(arr) {\n        var end = readPackedEnd(this);\n        arr = arr || [];\n        while (this.pos < end) arr.push(this.readBoolean());\n        return arr;\n    },\n    readPackedFloat: function(arr) {\n        var end = readPackedEnd(this);\n        arr = arr || [];\n        while (this.pos < end) arr.push(this.readFloat());\n        return arr;\n    },\n    readPackedDouble: function(arr) {\n        var end = readPackedEnd(this);\n        arr = arr || [];\n        while (this.pos < end) arr.push(this.readDouble());\n        return arr;\n    },\n    readPackedFixed32: function(arr) {\n        var end = readPackedEnd(this);\n        arr = arr || [];\n        while (this.pos < end) arr.push(this.readFixed32());\n        return arr;\n    },\n    readPackedSFixed32: function(arr) {\n        var end = readPackedEnd(this);\n        arr = arr || [];\n        while (this.pos < end) arr.push(this.readSFixed32());\n        return arr;\n    },\n    readPackedFixed64: function(arr) {\n        var end = readPackedEnd(this);\n        arr = arr || [];\n        while (this.pos < end) arr.push(this.readFixed64());\n        return arr;\n    },\n    readPackedSFixed64: function(arr) {\n        var end = readPackedEnd(this);\n        arr = arr || [];\n        while (this.pos < end) arr.push(this.readSFixed64());\n        return arr;\n    },\n\n    skip: function(val) {\n        var type = val & 0x7;\n        if (type === Pbf.Varint) while (this.buf[this.pos++] > 0x7f) {}\n        else if (type === Pbf.Bytes) this.pos = this.readVarint() + this.pos;\n        else if (type === Pbf.Fixed32) this.pos += 4;\n        else if (type === Pbf.Fixed64) this.pos += 8;\n        else throw new Error('Unimplemented type: ' + type);\n    },\n\n    // === WRITING =================================================================\n\n    writeTag: function(tag, type) {\n        this.writeVarint((tag << 3) | type);\n    },\n\n    realloc: function(min) {\n        var length = this.length || 16;\n\n        while (length < this.pos + min) length *= 2;\n\n        if (length !== this.length) {\n            var buf = new Uint8Array(length);\n            buf.set(this.buf);\n            this.buf = buf;\n            this.length = length;\n        }\n    },\n\n    finish: function() {\n        this.length = this.pos;\n        this.pos = 0;\n        return this.buf.subarray(0, this.length);\n    },\n\n    writeFixed32: function(val) {\n        this.realloc(4);\n        writeInt32(this.buf, val, this.pos);\n        this.pos += 4;\n    },\n\n    writeSFixed32: function(val) {\n        this.realloc(4);\n        writeInt32(this.buf, val, this.pos);\n        this.pos += 4;\n    },\n\n    writeFixed64: function(val) {\n        this.realloc(8);\n        writeInt32(this.buf, val & -1, this.pos);\n        writeInt32(this.buf, Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);\n        this.pos += 8;\n    },\n\n    writeSFixed64: function(val) {\n        this.realloc(8);\n        writeInt32(this.buf, val & -1, this.pos);\n        writeInt32(this.buf, Math.floor(val * SHIFT_RIGHT_32), this.pos + 4);\n        this.pos += 8;\n    },\n\n    writeVarint: function(val) {\n        val = +val || 0;\n\n        if (val > 0xfffffff || val < 0) {\n            writeBigVarint(val, this);\n            return;\n        }\n\n        this.realloc(4);\n\n        this.buf[this.pos++] =           val & 0x7f  | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;\n        this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;\n        this.buf[this.pos++] = ((val >>>= 7) & 0x7f) | (val > 0x7f ? 0x80 : 0); if (val <= 0x7f) return;\n        this.buf[this.pos++] =   (val >>> 7) & 0x7f;\n    },\n\n    writeSVarint: function(val) {\n        this.writeVarint(val < 0 ? -val * 2 - 1 : val * 2);\n    },\n\n    writeBoolean: function(val) {\n        this.writeVarint(Boolean(val));\n    },\n\n    writeString: function(str) {\n        str = String(str);\n        this.realloc(str.length * 4);\n\n        this.pos++; // reserve 1 byte for short string length\n\n        var startPos = this.pos;\n        // write the string directly to the buffer and see how much was written\n        this.pos = writeUtf8(this.buf, str, this.pos);\n        var len = this.pos - startPos;\n\n        if (len >= 0x80) makeRoomForExtraLength(startPos, len, this);\n\n        // finally, write the message length in the reserved place and restore the position\n        this.pos = startPos - 1;\n        this.writeVarint(len);\n        this.pos += len;\n    },\n\n    writeFloat: function(val) {\n        this.realloc(4);\n        ieee754.write(this.buf, val, this.pos, true, 23, 4);\n        this.pos += 4;\n    },\n\n    writeDouble: function(val) {\n        this.realloc(8);\n        ieee754.write(this.buf, val, this.pos, true, 52, 8);\n        this.pos += 8;\n    },\n\n    writeBytes: function(buffer) {\n        var len = buffer.length;\n        this.writeVarint(len);\n        this.realloc(len);\n        for (var i = 0; i < len; i++) this.buf[this.pos++] = buffer[i];\n    },\n\n    writeRawMessage: function(fn, obj) {\n        this.pos++; // reserve 1 byte for short message length\n\n        // write the message directly to the buffer and see how much was written\n        var startPos = this.pos;\n        fn(obj, this);\n        var len = this.pos - startPos;\n\n        if (len >= 0x80) makeRoomForExtraLength(startPos, len, this);\n\n        // finally, write the message length in the reserved place and restore the position\n        this.pos = startPos - 1;\n        this.writeVarint(len);\n        this.pos += len;\n    },\n\n    writeMessage: function(tag, fn, obj) {\n        this.writeTag(tag, Pbf.Bytes);\n        this.writeRawMessage(fn, obj);\n    },\n\n    writePackedVarint:   function(tag, arr) { this.writeMessage(tag, writePackedVarint, arr);   },\n    writePackedSVarint:  function(tag, arr) { this.writeMessage(tag, writePackedSVarint, arr);  },\n    writePackedBoolean:  function(tag, arr) { this.writeMessage(tag, writePackedBoolean, arr);  },\n    writePackedFloat:    function(tag, arr) { this.writeMessage(tag, writePackedFloat, arr);    },\n    writePackedDouble:   function(tag, arr) { this.writeMessage(tag, writePackedDouble, arr);   },\n    writePackedFixed32:  function(tag, arr) { this.writeMessage(tag, writePackedFixed32, arr);  },\n    writePackedSFixed32: function(tag, arr) { this.writeMessage(tag, writePackedSFixed32, arr); },\n    writePackedFixed64:  function(tag, arr) { this.writeMessage(tag, writePackedFixed64, arr);  },\n    writePackedSFixed64: function(tag, arr) { this.writeMessage(tag, writePackedSFixed64, arr); },\n\n    writeBytesField: function(tag, buffer) {\n        this.writeTag(tag, Pbf.Bytes);\n        this.writeBytes(buffer);\n    },\n    writeFixed32Field: function(tag, val) {\n        this.writeTag(tag, Pbf.Fixed32);\n        this.writeFixed32(val);\n    },\n    writeSFixed32Field: function(tag, val) {\n        this.writeTag(tag, Pbf.Fixed32);\n        this.writeSFixed32(val);\n    },\n    writeFixed64Field: function(tag, val) {\n        this.writeTag(tag, Pbf.Fixed64);\n        this.writeFixed64(val);\n    },\n    writeSFixed64Field: function(tag, val) {\n        this.writeTag(tag, Pbf.Fixed64);\n        this.writeSFixed64(val);\n    },\n    writeVarintField: function(tag, val) {\n        this.writeTag(tag, Pbf.Varint);\n        this.writeVarint(val);\n    },\n    writeSVarintField: function(tag, val) {\n        this.writeTag(tag, Pbf.Varint);\n        this.writeSVarint(val);\n    },\n    writeStringField: function(tag, str) {\n        this.writeTag(tag, Pbf.Bytes);\n        this.writeString(str);\n    },\n    writeFloatField: function(tag, val) {\n        this.writeTag(tag, Pbf.Fixed32);\n        this.writeFloat(val);\n    },\n    writeDoubleField: function(tag, val) {\n        this.writeTag(tag, Pbf.Fixed64);\n        this.writeDouble(val);\n    },\n    writeBooleanField: function(tag, val) {\n        this.writeVarintField(tag, Boolean(val));\n    }\n};\n\nfunction readVarintRemainder(l, s, p) {\n    var buf = p.buf,\n        h, b;\n\n    b = buf[p.pos++]; h  = (b & 0x70) >> 4;  if (b < 0x80) return toNum(l, h, s);\n    b = buf[p.pos++]; h |= (b & 0x7f) << 3;  if (b < 0x80) return toNum(l, h, s);\n    b = buf[p.pos++]; h |= (b & 0x7f) << 10; if (b < 0x80) return toNum(l, h, s);\n    b = buf[p.pos++]; h |= (b & 0x7f) << 17; if (b < 0x80) return toNum(l, h, s);\n    b = buf[p.pos++]; h |= (b & 0x7f) << 24; if (b < 0x80) return toNum(l, h, s);\n    b = buf[p.pos++]; h |= (b & 0x01) << 31; if (b < 0x80) return toNum(l, h, s);\n\n    throw new Error('Expected varint not more than 10 bytes');\n}\n\nfunction readPackedEnd(pbf) {\n    return pbf.type === Pbf.Bytes ?\n        pbf.readVarint() + pbf.pos : pbf.pos + 1;\n}\n\nfunction toNum(low, high, isSigned) {\n    if (isSigned) {\n        return high * 0x100000000 + (low >>> 0);\n    }\n\n    return ((high >>> 0) * 0x100000000) + (low >>> 0);\n}\n\nfunction writeBigVarint(val, pbf) {\n    var low, high;\n\n    if (val >= 0) {\n        low  = (val % 0x100000000) | 0;\n        high = (val / 0x100000000) | 0;\n    } else {\n        low  = ~(-val % 0x100000000);\n        high = ~(-val / 0x100000000);\n\n        if (low ^ 0xffffffff) {\n            low = (low + 1) | 0;\n        } else {\n            low = 0;\n            high = (high + 1) | 0;\n        }\n    }\n\n    if (val >= 0x10000000000000000 || val < -0x10000000000000000) {\n        throw new Error('Given varint doesn\\'t fit into 10 bytes');\n    }\n\n    pbf.realloc(10);\n\n    writeBigVarintLow(low, high, pbf);\n    writeBigVarintHigh(high, pbf);\n}\n\nfunction writeBigVarintLow(low, high, pbf) {\n    pbf.buf[pbf.pos++] = low & 0x7f | 0x80; low >>>= 7;\n    pbf.buf[pbf.pos++] = low & 0x7f | 0x80; low >>>= 7;\n    pbf.buf[pbf.pos++] = low & 0x7f | 0x80; low >>>= 7;\n    pbf.buf[pbf.pos++] = low & 0x7f | 0x80; low >>>= 7;\n    pbf.buf[pbf.pos]   = low & 0x7f;\n}\n\nfunction writeBigVarintHigh(high, pbf) {\n    var lsb = (high & 0x07) << 4;\n\n    pbf.buf[pbf.pos++] |= lsb         | ((high >>>= 3) ? 0x80 : 0); if (!high) return;\n    pbf.buf[pbf.pos++]  = high & 0x7f | ((high >>>= 7) ? 0x80 : 0); if (!high) return;\n    pbf.buf[pbf.pos++]  = high & 0x7f | ((high >>>= 7) ? 0x80 : 0); if (!high) return;\n    pbf.buf[pbf.pos++]  = high & 0x7f | ((high >>>= 7) ? 0x80 : 0); if (!high) return;\n    pbf.buf[pbf.pos++]  = high & 0x7f | ((high >>>= 7) ? 0x80 : 0); if (!high) return;\n    pbf.buf[pbf.pos++]  = high & 0x7f;\n}\n\nfunction makeRoomForExtraLength(startPos, len, pbf) {\n    var extraLen =\n        len <= 0x3fff ? 1 :\n        len <= 0x1fffff ? 2 :\n        len <= 0xfffffff ? 3 : Math.ceil(Math.log(len) / (Math.LN2 * 7));\n\n    // if 1 byte isn't enough for encoding message length, shift the data to the right\n    pbf.realloc(extraLen);\n    for (var i = pbf.pos - 1; i >= startPos; i--) pbf.buf[i + extraLen] = pbf.buf[i];\n}\n\nfunction writePackedVarint(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeVarint(arr[i]);   }\nfunction writePackedSVarint(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeSVarint(arr[i]);  }\nfunction writePackedFloat(arr, pbf)    { for (var i = 0; i < arr.length; i++) pbf.writeFloat(arr[i]);    }\nfunction writePackedDouble(arr, pbf)   { for (var i = 0; i < arr.length; i++) pbf.writeDouble(arr[i]);   }\nfunction writePackedBoolean(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeBoolean(arr[i]);  }\nfunction writePackedFixed32(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed32(arr[i]);  }\nfunction writePackedSFixed32(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed32(arr[i]); }\nfunction writePackedFixed64(arr, pbf)  { for (var i = 0; i < arr.length; i++) pbf.writeFixed64(arr[i]);  }\nfunction writePackedSFixed64(arr, pbf) { for (var i = 0; i < arr.length; i++) pbf.writeSFixed64(arr[i]); }\n\n// Buffer code below from https://github.com/feross/buffer, MIT-licensed\n\nfunction readUInt32(buf, pos) {\n    return ((buf[pos]) |\n        (buf[pos + 1] << 8) |\n        (buf[pos + 2] << 16)) +\n        (buf[pos + 3] * 0x1000000);\n}\n\nfunction writeInt32(buf, val, pos) {\n    buf[pos] = val;\n    buf[pos + 1] = (val >>> 8);\n    buf[pos + 2] = (val >>> 16);\n    buf[pos + 3] = (val >>> 24);\n}\n\nfunction readInt32(buf, pos) {\n    return ((buf[pos]) |\n        (buf[pos + 1] << 8) |\n        (buf[pos + 2] << 16)) +\n        (buf[pos + 3] << 24);\n}\n\nfunction readUtf8(buf, pos, end) {\n    var str = '';\n    var i = pos;\n\n    while (i < end) {\n        var b0 = buf[i];\n        var c = null; // codepoint\n        var bytesPerSequence =\n            b0 > 0xEF ? 4 :\n            b0 > 0xDF ? 3 :\n            b0 > 0xBF ? 2 : 1;\n\n        if (i + bytesPerSequence > end) break;\n\n        var b1, b2, b3;\n\n        if (bytesPerSequence === 1) {\n            if (b0 < 0x80) {\n                c = b0;\n            }\n        } else if (bytesPerSequence === 2) {\n            b1 = buf[i + 1];\n            if ((b1 & 0xC0) === 0x80) {\n                c = (b0 & 0x1F) << 0x6 | (b1 & 0x3F);\n                if (c <= 0x7F) {\n                    c = null;\n                }\n            }\n        } else if (bytesPerSequence === 3) {\n            b1 = buf[i + 1];\n            b2 = buf[i + 2];\n            if ((b1 & 0xC0) === 0x80 && (b2 & 0xC0) === 0x80) {\n                c = (b0 & 0xF) << 0xC | (b1 & 0x3F) << 0x6 | (b2 & 0x3F);\n                if (c <= 0x7FF || (c >= 0xD800 && c <= 0xDFFF)) {\n                    c = null;\n                }\n            }\n        } else if (bytesPerSequence === 4) {\n            b1 = buf[i + 1];\n            b2 = buf[i + 2];\n            b3 = buf[i + 3];\n            if ((b1 & 0xC0) === 0x80 && (b2 & 0xC0) === 0x80 && (b3 & 0xC0) === 0x80) {\n                c = (b0 & 0xF) << 0x12 | (b1 & 0x3F) << 0xC | (b2 & 0x3F) << 0x6 | (b3 & 0x3F);\n                if (c <= 0xFFFF || c >= 0x110000) {\n                    c = null;\n                }\n            }\n        }\n\n        if (c === null) {\n            c = 0xFFFD;\n            bytesPerSequence = 1;\n\n        } else if (c > 0xFFFF) {\n            c -= 0x10000;\n            str += String.fromCharCode(c >>> 10 & 0x3FF | 0xD800);\n            c = 0xDC00 | c & 0x3FF;\n        }\n\n        str += String.fromCharCode(c);\n        i += bytesPerSequence;\n    }\n\n    return str;\n}\n\nfunction writeUtf8(buf, str, pos) {\n    for (var i = 0, c, lead; i < str.length; i++) {\n        c = str.charCodeAt(i); // code point\n\n        if (c > 0xD7FF && c < 0xE000) {\n            if (lead) {\n                if (c < 0xDC00) {\n                    buf[pos++] = 0xEF;\n                    buf[pos++] = 0xBF;\n                    buf[pos++] = 0xBD;\n                    lead = c;\n                    continue;\n                } else {\n                    c = lead - 0xD800 << 10 | c - 0xDC00 | 0x10000;\n                    lead = null;\n                }\n            } else {\n                if (c > 0xDBFF || (i + 1 === str.length)) {\n                    buf[pos++] = 0xEF;\n                    buf[pos++] = 0xBF;\n                    buf[pos++] = 0xBD;\n                } else {\n                    lead = c;\n                }\n                continue;\n            }\n        } else if (lead) {\n            buf[pos++] = 0xEF;\n            buf[pos++] = 0xBF;\n            buf[pos++] = 0xBD;\n            lead = null;\n        }\n\n        if (c < 0x80) {\n            buf[pos++] = c;\n        } else {\n            if (c < 0x800) {\n                buf[pos++] = c >> 0x6 | 0xC0;\n            } else {\n                if (c < 0x10000) {\n                    buf[pos++] = c >> 0xC | 0xE0;\n                } else {\n                    buf[pos++] = c >> 0x12 | 0xF0;\n                    buf[pos++] = c >> 0xC & 0x3F | 0x80;\n                }\n                buf[pos++] = c >> 0x6 & 0x3F | 0x80;\n            }\n            buf[pos++] = c & 0x3F | 0x80;\n        }\n    }\n    return pos;\n}\n","/*!\n * The buffer module from node.js, for the browser.\n *\n * @author   Feross Aboukhadijeh <feross@feross.org> <http://feross.org>\n * @license  MIT\n */\n/* eslint-disable no-proto */\n\n'use strict'\n\nvar base64 = require('base64-js')\nvar ieee754 = require('ieee754')\nvar isArray = require('isarray')\n\nexports.Buffer = Buffer\nexports.SlowBuffer = SlowBuffer\nexports.INSPECT_MAX_BYTES = 50\n\n/**\n * If `Buffer.TYPED_ARRAY_SUPPORT`:\n *   === true    Use Uint8Array implementation (fastest)\n *   === false   Use Object implementation (most compatible, even IE6)\n *\n * Browsers that support typed arrays are IE 10+, Firefox 4+, Chrome 7+, Safari 5.1+,\n * Opera 11.6+, iOS 4.2+.\n *\n * Due to various browser bugs, sometimes the Object implementation will be used even\n * when the browser supports typed arrays.\n *\n * Note:\n *\n *   - Firefox 4-29 lacks support for adding new properties to `Uint8Array` instances,\n *     See: https://bugzilla.mozilla.org/show_bug.cgi?id=695438.\n *\n *   - Chrome 9-10 is missing the `TypedArray.prototype.subarray` function.\n *\n *   - IE10 has a broken `TypedArray.prototype.subarray` function which returns arrays of\n *     incorrect length in some situations.\n\n * We detect these buggy browsers and set `Buffer.TYPED_ARRAY_SUPPORT` to `false` so they\n * get the Object implementation, which is slower but behaves correctly.\n */\nBuffer.TYPED_ARRAY_SUPPORT = global.TYPED_ARRAY_SUPPORT !== undefined\n  ? global.TYPED_ARRAY_SUPPORT\n  : typedArraySupport()\n\n/*\n * Export kMaxLength after typed array support is determined.\n */\nexports.kMaxLength = kMaxLength()\n\nfunction typedArraySupport () {\n  try {\n    var arr = new Uint8Array(1)\n    arr.__proto__ = {__proto__: Uint8Array.prototype, foo: function () { return 42 }}\n    return arr.foo() === 42 && // typed array instances can be augmented\n        typeof arr.subarray === 'function' && // chrome 9-10 lack `subarray`\n        arr.subarray(1, 1).byteLength === 0 // ie10 has broken `subarray`\n  } catch (e) {\n    return false\n  }\n}\n\nfunction kMaxLength () {\n  return Buffer.TYPED_ARRAY_SUPPORT\n    ? 0x7fffffff\n    : 0x3fffffff\n}\n\nfunction createBuffer (that, length) {\n  if (kMaxLength() < length) {\n    throw new RangeError('Invalid typed array length')\n  }\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    // Return an augmented `Uint8Array` instance, for best performance\n    that = new Uint8Array(length)\n    that.__proto__ = Buffer.prototype\n  } else {\n    // Fallback: Return an object instance of the Buffer class\n    if (that === null) {\n      that = new Buffer(length)\n    }\n    that.length = length\n  }\n\n  return that\n}\n\n/**\n * The Buffer constructor returns instances of `Uint8Array` that have their\n * prototype changed to `Buffer.prototype`. Furthermore, `Buffer` is a subclass of\n * `Uint8Array`, so the returned instances will have all the node `Buffer` methods\n * and the `Uint8Array` methods. Square bracket notation works as expected -- it\n * returns a single octet.\n *\n * The `Uint8Array` prototype remains unmodified.\n */\n\nfunction Buffer (arg, encodingOrOffset, length) {\n  if (!Buffer.TYPED_ARRAY_SUPPORT && !(this instanceof Buffer)) {\n    return new Buffer(arg, encodingOrOffset, length)\n  }\n\n  // Common case.\n  if (typeof arg === 'number') {\n    if (typeof encodingOrOffset === 'string') {\n      throw new Error(\n        'If encoding is specified then the first argument must be a string'\n      )\n    }\n    return allocUnsafe(this, arg)\n  }\n  return from(this, arg, encodingOrOffset, length)\n}\n\nBuffer.poolSize = 8192 // not used by this implementation\n\n// TODO: Legacy, not needed anymore. Remove in next major version.\nBuffer._augment = function (arr) {\n  arr.__proto__ = Buffer.prototype\n  return arr\n}\n\nfunction from (that, value, encodingOrOffset, length) {\n  if (typeof value === 'number') {\n    throw new TypeError('\"value\" argument must not be a number')\n  }\n\n  if (typeof ArrayBuffer !== 'undefined' && value instanceof ArrayBuffer) {\n    return fromArrayBuffer(that, value, encodingOrOffset, length)\n  }\n\n  if (typeof value === 'string') {\n    return fromString(that, value, encodingOrOffset)\n  }\n\n  return fromObject(that, value)\n}\n\n/**\n * Functionally equivalent to Buffer(arg, encoding) but throws a TypeError\n * if value is a number.\n * Buffer.from(str[, encoding])\n * Buffer.from(array)\n * Buffer.from(buffer)\n * Buffer.from(arrayBuffer[, byteOffset[, length]])\n **/\nBuffer.from = function (value, encodingOrOffset, length) {\n  return from(null, value, encodingOrOffset, length)\n}\n\nif (Buffer.TYPED_ARRAY_SUPPORT) {\n  Buffer.prototype.__proto__ = Uint8Array.prototype\n  Buffer.__proto__ = Uint8Array\n  if (typeof Symbol !== 'undefined' && Symbol.species &&\n      Buffer[Symbol.species] === Buffer) {\n    // Fix subarray() in ES2016. See: https://github.com/feross/buffer/pull/97\n    Object.defineProperty(Buffer, Symbol.species, {\n      value: null,\n      configurable: true\n    })\n  }\n}\n\nfunction assertSize (size) {\n  if (typeof size !== 'number') {\n    throw new TypeError('\"size\" argument must be a number')\n  } else if (size < 0) {\n    throw new RangeError('\"size\" argument must not be negative')\n  }\n}\n\nfunction alloc (that, size, fill, encoding) {\n  assertSize(size)\n  if (size <= 0) {\n    return createBuffer(that, size)\n  }\n  if (fill !== undefined) {\n    // Only pay attention to encoding if it's a string. This\n    // prevents accidentally sending in a number that would\n    // be interpretted as a start offset.\n    return typeof encoding === 'string'\n      ? createBuffer(that, size).fill(fill, encoding)\n      : createBuffer(that, size).fill(fill)\n  }\n  return createBuffer(that, size)\n}\n\n/**\n * Creates a new filled Buffer instance.\n * alloc(size[, fill[, encoding]])\n **/\nBuffer.alloc = function (size, fill, encoding) {\n  return alloc(null, size, fill, encoding)\n}\n\nfunction allocUnsafe (that, size) {\n  assertSize(size)\n  that = createBuffer(that, size < 0 ? 0 : checked(size) | 0)\n  if (!Buffer.TYPED_ARRAY_SUPPORT) {\n    for (var i = 0; i < size; ++i) {\n      that[i] = 0\n    }\n  }\n  return that\n}\n\n/**\n * Equivalent to Buffer(num), by default creates a non-zero-filled Buffer instance.\n * */\nBuffer.allocUnsafe = function (size) {\n  return allocUnsafe(null, size)\n}\n/**\n * Equivalent to SlowBuffer(num), by default creates a non-zero-filled Buffer instance.\n */\nBuffer.allocUnsafeSlow = function (size) {\n  return allocUnsafe(null, size)\n}\n\nfunction fromString (that, string, encoding) {\n  if (typeof encoding !== 'string' || encoding === '') {\n    encoding = 'utf8'\n  }\n\n  if (!Buffer.isEncoding(encoding)) {\n    throw new TypeError('\"encoding\" must be a valid string encoding')\n  }\n\n  var length = byteLength(string, encoding) | 0\n  that = createBuffer(that, length)\n\n  var actual = that.write(string, encoding)\n\n  if (actual !== length) {\n    // Writing a hex string, for example, that contains invalid characters will\n    // cause everything after the first invalid character to be ignored. (e.g.\n    // 'abxxcd' will be treated as 'ab')\n    that = that.slice(0, actual)\n  }\n\n  return that\n}\n\nfunction fromArrayLike (that, array) {\n  var length = array.length < 0 ? 0 : checked(array.length) | 0\n  that = createBuffer(that, length)\n  for (var i = 0; i < length; i += 1) {\n    that[i] = array[i] & 255\n  }\n  return that\n}\n\nfunction fromArrayBuffer (that, array, byteOffset, length) {\n  array.byteLength // this throws if `array` is not a valid ArrayBuffer\n\n  if (byteOffset < 0 || array.byteLength < byteOffset) {\n    throw new RangeError('\\'offset\\' is out of bounds')\n  }\n\n  if (array.byteLength < byteOffset + (length || 0)) {\n    throw new RangeError('\\'length\\' is out of bounds')\n  }\n\n  if (byteOffset === undefined && length === undefined) {\n    array = new Uint8Array(array)\n  } else if (length === undefined) {\n    array = new Uint8Array(array, byteOffset)\n  } else {\n    array = new Uint8Array(array, byteOffset, length)\n  }\n\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    // Return an augmented `Uint8Array` instance, for best performance\n    that = array\n    that.__proto__ = Buffer.prototype\n  } else {\n    // Fallback: Return an object instance of the Buffer class\n    that = fromArrayLike(that, array)\n  }\n  return that\n}\n\nfunction fromObject (that, obj) {\n  if (Buffer.isBuffer(obj)) {\n    var len = checked(obj.length) | 0\n    that = createBuffer(that, len)\n\n    if (that.length === 0) {\n      return that\n    }\n\n    obj.copy(that, 0, 0, len)\n    return that\n  }\n\n  if (obj) {\n    if ((typeof ArrayBuffer !== 'undefined' &&\n        obj.buffer instanceof ArrayBuffer) || 'length' in obj) {\n      if (typeof obj.length !== 'number' || isnan(obj.length)) {\n        return createBuffer(that, 0)\n      }\n      return fromArrayLike(that, obj)\n    }\n\n    if (obj.type === 'Buffer' && isArray(obj.data)) {\n      return fromArrayLike(that, obj.data)\n    }\n  }\n\n  throw new TypeError('First argument must be a string, Buffer, ArrayBuffer, Array, or array-like object.')\n}\n\nfunction checked (length) {\n  // Note: cannot use `length < kMaxLength()` here because that fails when\n  // length is NaN (which is otherwise coerced to zero.)\n  if (length >= kMaxLength()) {\n    throw new RangeError('Attempt to allocate Buffer larger than maximum ' +\n                         'size: 0x' + kMaxLength().toString(16) + ' bytes')\n  }\n  return length | 0\n}\n\nfunction SlowBuffer (length) {\n  if (+length != length) { // eslint-disable-line eqeqeq\n    length = 0\n  }\n  return Buffer.alloc(+length)\n}\n\nBuffer.isBuffer = function isBuffer (b) {\n  return !!(b != null && b._isBuffer)\n}\n\nBuffer.compare = function compare (a, b) {\n  if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {\n    throw new TypeError('Arguments must be Buffers')\n  }\n\n  if (a === b) return 0\n\n  var x = a.length\n  var y = b.length\n\n  for (var i = 0, len = Math.min(x, y); i < len; ++i) {\n    if (a[i] !== b[i]) {\n      x = a[i]\n      y = b[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\nBuffer.isEncoding = function isEncoding (encoding) {\n  switch (String(encoding).toLowerCase()) {\n    case 'hex':\n    case 'utf8':\n    case 'utf-8':\n    case 'ascii':\n    case 'latin1':\n    case 'binary':\n    case 'base64':\n    case 'ucs2':\n    case 'ucs-2':\n    case 'utf16le':\n    case 'utf-16le':\n      return true\n    default:\n      return false\n  }\n}\n\nBuffer.concat = function concat (list, length) {\n  if (!isArray(list)) {\n    throw new TypeError('\"list\" argument must be an Array of Buffers')\n  }\n\n  if (list.length === 0) {\n    return Buffer.alloc(0)\n  }\n\n  var i\n  if (length === undefined) {\n    length = 0\n    for (i = 0; i < list.length; ++i) {\n      length += list[i].length\n    }\n  }\n\n  var buffer = Buffer.allocUnsafe(length)\n  var pos = 0\n  for (i = 0; i < list.length; ++i) {\n    var buf = list[i]\n    if (!Buffer.isBuffer(buf)) {\n      throw new TypeError('\"list\" argument must be an Array of Buffers')\n    }\n    buf.copy(buffer, pos)\n    pos += buf.length\n  }\n  return buffer\n}\n\nfunction byteLength (string, encoding) {\n  if (Buffer.isBuffer(string)) {\n    return string.length\n  }\n  if (typeof ArrayBuffer !== 'undefined' && typeof ArrayBuffer.isView === 'function' &&\n      (ArrayBuffer.isView(string) || string instanceof ArrayBuffer)) {\n    return string.byteLength\n  }\n  if (typeof string !== 'string') {\n    string = '' + string\n  }\n\n  var len = string.length\n  if (len === 0) return 0\n\n  // Use a for loop to avoid recursion\n  var loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'ascii':\n      case 'latin1':\n      case 'binary':\n        return len\n      case 'utf8':\n      case 'utf-8':\n      case undefined:\n        return utf8ToBytes(string).length\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return len * 2\n      case 'hex':\n        return len >>> 1\n      case 'base64':\n        return base64ToBytes(string).length\n      default:\n        if (loweredCase) return utf8ToBytes(string).length // assume utf8\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\nBuffer.byteLength = byteLength\n\nfunction slowToString (encoding, start, end) {\n  var loweredCase = false\n\n  // No need to verify that \"this.length <= MAX_UINT32\" since it's a read-only\n  // property of a typed array.\n\n  // This behaves neither like String nor Uint8Array in that we set start/end\n  // to their upper/lower bounds if the value passed is out of range.\n  // undefined is handled specially as per ECMA-262 6th Edition,\n  // Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.\n  if (start === undefined || start < 0) {\n    start = 0\n  }\n  // Return early if start > this.length. Done here to prevent potential uint32\n  // coercion fail below.\n  if (start > this.length) {\n    return ''\n  }\n\n  if (end === undefined || end > this.length) {\n    end = this.length\n  }\n\n  if (end <= 0) {\n    return ''\n  }\n\n  // Force coersion to uint32. This will also coerce falsey/NaN values to 0.\n  end >>>= 0\n  start >>>= 0\n\n  if (end <= start) {\n    return ''\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  while (true) {\n    switch (encoding) {\n      case 'hex':\n        return hexSlice(this, start, end)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Slice(this, start, end)\n\n      case 'ascii':\n        return asciiSlice(this, start, end)\n\n      case 'latin1':\n      case 'binary':\n        return latin1Slice(this, start, end)\n\n      case 'base64':\n        return base64Slice(this, start, end)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return utf16leSlice(this, start, end)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = (encoding + '').toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\n// The property is used by `Buffer.isBuffer` and `is-buffer` (in Safari 5-7) to detect\n// Buffer instances.\nBuffer.prototype._isBuffer = true\n\nfunction swap (b, n, m) {\n  var i = b[n]\n  b[n] = b[m]\n  b[m] = i\n}\n\nBuffer.prototype.swap16 = function swap16 () {\n  var len = this.length\n  if (len % 2 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 16-bits')\n  }\n  for (var i = 0; i < len; i += 2) {\n    swap(this, i, i + 1)\n  }\n  return this\n}\n\nBuffer.prototype.swap32 = function swap32 () {\n  var len = this.length\n  if (len % 4 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 32-bits')\n  }\n  for (var i = 0; i < len; i += 4) {\n    swap(this, i, i + 3)\n    swap(this, i + 1, i + 2)\n  }\n  return this\n}\n\nBuffer.prototype.swap64 = function swap64 () {\n  var len = this.length\n  if (len % 8 !== 0) {\n    throw new RangeError('Buffer size must be a multiple of 64-bits')\n  }\n  for (var i = 0; i < len; i += 8) {\n    swap(this, i, i + 7)\n    swap(this, i + 1, i + 6)\n    swap(this, i + 2, i + 5)\n    swap(this, i + 3, i + 4)\n  }\n  return this\n}\n\nBuffer.prototype.toString = function toString () {\n  var length = this.length | 0\n  if (length === 0) return ''\n  if (arguments.length === 0) return utf8Slice(this, 0, length)\n  return slowToString.apply(this, arguments)\n}\n\nBuffer.prototype.equals = function equals (b) {\n  if (!Buffer.isBuffer(b)) throw new TypeError('Argument must be a Buffer')\n  if (this === b) return true\n  return Buffer.compare(this, b) === 0\n}\n\nBuffer.prototype.inspect = function inspect () {\n  var str = ''\n  var max = exports.INSPECT_MAX_BYTES\n  if (this.length > 0) {\n    str = this.toString('hex', 0, max).match(/.{2}/g).join(' ')\n    if (this.length > max) str += ' ... '\n  }\n  return '<Buffer ' + str + '>'\n}\n\nBuffer.prototype.compare = function compare (target, start, end, thisStart, thisEnd) {\n  if (!Buffer.isBuffer(target)) {\n    throw new TypeError('Argument must be a Buffer')\n  }\n\n  if (start === undefined) {\n    start = 0\n  }\n  if (end === undefined) {\n    end = target ? target.length : 0\n  }\n  if (thisStart === undefined) {\n    thisStart = 0\n  }\n  if (thisEnd === undefined) {\n    thisEnd = this.length\n  }\n\n  if (start < 0 || end > target.length || thisStart < 0 || thisEnd > this.length) {\n    throw new RangeError('out of range index')\n  }\n\n  if (thisStart >= thisEnd && start >= end) {\n    return 0\n  }\n  if (thisStart >= thisEnd) {\n    return -1\n  }\n  if (start >= end) {\n    return 1\n  }\n\n  start >>>= 0\n  end >>>= 0\n  thisStart >>>= 0\n  thisEnd >>>= 0\n\n  if (this === target) return 0\n\n  var x = thisEnd - thisStart\n  var y = end - start\n  var len = Math.min(x, y)\n\n  var thisCopy = this.slice(thisStart, thisEnd)\n  var targetCopy = target.slice(start, end)\n\n  for (var i = 0; i < len; ++i) {\n    if (thisCopy[i] !== targetCopy[i]) {\n      x = thisCopy[i]\n      y = targetCopy[i]\n      break\n    }\n  }\n\n  if (x < y) return -1\n  if (y < x) return 1\n  return 0\n}\n\n// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,\n// OR the last index of `val` in `buffer` at offset <= `byteOffset`.\n//\n// Arguments:\n// - buffer - a Buffer to search\n// - val - a string, Buffer, or number\n// - byteOffset - an index into `buffer`; will be clamped to an int32\n// - encoding - an optional encoding, relevant is val is a string\n// - dir - true for indexOf, false for lastIndexOf\nfunction bidirectionalIndexOf (buffer, val, byteOffset, encoding, dir) {\n  // Empty buffer means no match\n  if (buffer.length === 0) return -1\n\n  // Normalize byteOffset\n  if (typeof byteOffset === 'string') {\n    encoding = byteOffset\n    byteOffset = 0\n  } else if (byteOffset > 0x7fffffff) {\n    byteOffset = 0x7fffffff\n  } else if (byteOffset < -0x80000000) {\n    byteOffset = -0x80000000\n  }\n  byteOffset = +byteOffset  // Coerce to Number.\n  if (isNaN(byteOffset)) {\n    // byteOffset: it it's undefined, null, NaN, \"foo\", etc, search whole buffer\n    byteOffset = dir ? 0 : (buffer.length - 1)\n  }\n\n  // Normalize byteOffset: negative offsets start from the end of the buffer\n  if (byteOffset < 0) byteOffset = buffer.length + byteOffset\n  if (byteOffset >= buffer.length) {\n    if (dir) return -1\n    else byteOffset = buffer.length - 1\n  } else if (byteOffset < 0) {\n    if (dir) byteOffset = 0\n    else return -1\n  }\n\n  // Normalize val\n  if (typeof val === 'string') {\n    val = Buffer.from(val, encoding)\n  }\n\n  // Finally, search either indexOf (if dir is true) or lastIndexOf\n  if (Buffer.isBuffer(val)) {\n    // Special case: looking for empty string/buffer always fails\n    if (val.length === 0) {\n      return -1\n    }\n    return arrayIndexOf(buffer, val, byteOffset, encoding, dir)\n  } else if (typeof val === 'number') {\n    val = val & 0xFF // Search for a byte value [0-255]\n    if (Buffer.TYPED_ARRAY_SUPPORT &&\n        typeof Uint8Array.prototype.indexOf === 'function') {\n      if (dir) {\n        return Uint8Array.prototype.indexOf.call(buffer, val, byteOffset)\n      } else {\n        return Uint8Array.prototype.lastIndexOf.call(buffer, val, byteOffset)\n      }\n    }\n    return arrayIndexOf(buffer, [ val ], byteOffset, encoding, dir)\n  }\n\n  throw new TypeError('val must be string, number or Buffer')\n}\n\nfunction arrayIndexOf (arr, val, byteOffset, encoding, dir) {\n  var indexSize = 1\n  var arrLength = arr.length\n  var valLength = val.length\n\n  if (encoding !== undefined) {\n    encoding = String(encoding).toLowerCase()\n    if (encoding === 'ucs2' || encoding === 'ucs-2' ||\n        encoding === 'utf16le' || encoding === 'utf-16le') {\n      if (arr.length < 2 || val.length < 2) {\n        return -1\n      }\n      indexSize = 2\n      arrLength /= 2\n      valLength /= 2\n      byteOffset /= 2\n    }\n  }\n\n  function read (buf, i) {\n    if (indexSize === 1) {\n      return buf[i]\n    } else {\n      return buf.readUInt16BE(i * indexSize)\n    }\n  }\n\n  var i\n  if (dir) {\n    var foundIndex = -1\n    for (i = byteOffset; i < arrLength; i++) {\n      if (read(arr, i) === read(val, foundIndex === -1 ? 0 : i - foundIndex)) {\n        if (foundIndex === -1) foundIndex = i\n        if (i - foundIndex + 1 === valLength) return foundIndex * indexSize\n      } else {\n        if (foundIndex !== -1) i -= i - foundIndex\n        foundIndex = -1\n      }\n    }\n  } else {\n    if (byteOffset + valLength > arrLength) byteOffset = arrLength - valLength\n    for (i = byteOffset; i >= 0; i--) {\n      var found = true\n      for (var j = 0; j < valLength; j++) {\n        if (read(arr, i + j) !== read(val, j)) {\n          found = false\n          break\n        }\n      }\n      if (found) return i\n    }\n  }\n\n  return -1\n}\n\nBuffer.prototype.includes = function includes (val, byteOffset, encoding) {\n  return this.indexOf(val, byteOffset, encoding) !== -1\n}\n\nBuffer.prototype.indexOf = function indexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, true)\n}\n\nBuffer.prototype.lastIndexOf = function lastIndexOf (val, byteOffset, encoding) {\n  return bidirectionalIndexOf(this, val, byteOffset, encoding, false)\n}\n\nfunction hexWrite (buf, string, offset, length) {\n  offset = Number(offset) || 0\n  var remaining = buf.length - offset\n  if (!length) {\n    length = remaining\n  } else {\n    length = Number(length)\n    if (length > remaining) {\n      length = remaining\n    }\n  }\n\n  // must be an even number of digits\n  var strLen = string.length\n  if (strLen % 2 !== 0) throw new TypeError('Invalid hex string')\n\n  if (length > strLen / 2) {\n    length = strLen / 2\n  }\n  for (var i = 0; i < length; ++i) {\n    var parsed = parseInt(string.substr(i * 2, 2), 16)\n    if (isNaN(parsed)) return i\n    buf[offset + i] = parsed\n  }\n  return i\n}\n\nfunction utf8Write (buf, string, offset, length) {\n  return blitBuffer(utf8ToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nfunction asciiWrite (buf, string, offset, length) {\n  return blitBuffer(asciiToBytes(string), buf, offset, length)\n}\n\nfunction latin1Write (buf, string, offset, length) {\n  return asciiWrite(buf, string, offset, length)\n}\n\nfunction base64Write (buf, string, offset, length) {\n  return blitBuffer(base64ToBytes(string), buf, offset, length)\n}\n\nfunction ucs2Write (buf, string, offset, length) {\n  return blitBuffer(utf16leToBytes(string, buf.length - offset), buf, offset, length)\n}\n\nBuffer.prototype.write = function write (string, offset, length, encoding) {\n  // Buffer#write(string)\n  if (offset === undefined) {\n    encoding = 'utf8'\n    length = this.length\n    offset = 0\n  // Buffer#write(string, encoding)\n  } else if (length === undefined && typeof offset === 'string') {\n    encoding = offset\n    length = this.length\n    offset = 0\n  // Buffer#write(string, offset[, length][, encoding])\n  } else if (isFinite(offset)) {\n    offset = offset | 0\n    if (isFinite(length)) {\n      length = length | 0\n      if (encoding === undefined) encoding = 'utf8'\n    } else {\n      encoding = length\n      length = undefined\n    }\n  // legacy write(string, encoding, offset, length) - remove in v0.13\n  } else {\n    throw new Error(\n      'Buffer.write(string, encoding, offset[, length]) is no longer supported'\n    )\n  }\n\n  var remaining = this.length - offset\n  if (length === undefined || length > remaining) length = remaining\n\n  if ((string.length > 0 && (length < 0 || offset < 0)) || offset > this.length) {\n    throw new RangeError('Attempt to write outside buffer bounds')\n  }\n\n  if (!encoding) encoding = 'utf8'\n\n  var loweredCase = false\n  for (;;) {\n    switch (encoding) {\n      case 'hex':\n        return hexWrite(this, string, offset, length)\n\n      case 'utf8':\n      case 'utf-8':\n        return utf8Write(this, string, offset, length)\n\n      case 'ascii':\n        return asciiWrite(this, string, offset, length)\n\n      case 'latin1':\n      case 'binary':\n        return latin1Write(this, string, offset, length)\n\n      case 'base64':\n        // Warning: maxLength not taken into account in base64Write\n        return base64Write(this, string, offset, length)\n\n      case 'ucs2':\n      case 'ucs-2':\n      case 'utf16le':\n      case 'utf-16le':\n        return ucs2Write(this, string, offset, length)\n\n      default:\n        if (loweredCase) throw new TypeError('Unknown encoding: ' + encoding)\n        encoding = ('' + encoding).toLowerCase()\n        loweredCase = true\n    }\n  }\n}\n\nBuffer.prototype.toJSON = function toJSON () {\n  return {\n    type: 'Buffer',\n    data: Array.prototype.slice.call(this._arr || this, 0)\n  }\n}\n\nfunction base64Slice (buf, start, end) {\n  if (start === 0 && end === buf.length) {\n    return base64.fromByteArray(buf)\n  } else {\n    return base64.fromByteArray(buf.slice(start, end))\n  }\n}\n\nfunction utf8Slice (buf, start, end) {\n  end = Math.min(buf.length, end)\n  var res = []\n\n  var i = start\n  while (i < end) {\n    var firstByte = buf[i]\n    var codePoint = null\n    var bytesPerSequence = (firstByte > 0xEF) ? 4\n      : (firstByte > 0xDF) ? 3\n      : (firstByte > 0xBF) ? 2\n      : 1\n\n    if (i + bytesPerSequence <= end) {\n      var secondByte, thirdByte, fourthByte, tempCodePoint\n\n      switch (bytesPerSequence) {\n        case 1:\n          if (firstByte < 0x80) {\n            codePoint = firstByte\n          }\n          break\n        case 2:\n          secondByte = buf[i + 1]\n          if ((secondByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0x1F) << 0x6 | (secondByte & 0x3F)\n            if (tempCodePoint > 0x7F) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 3:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0xC | (secondByte & 0x3F) << 0x6 | (thirdByte & 0x3F)\n            if (tempCodePoint > 0x7FF && (tempCodePoint < 0xD800 || tempCodePoint > 0xDFFF)) {\n              codePoint = tempCodePoint\n            }\n          }\n          break\n        case 4:\n          secondByte = buf[i + 1]\n          thirdByte = buf[i + 2]\n          fourthByte = buf[i + 3]\n          if ((secondByte & 0xC0) === 0x80 && (thirdByte & 0xC0) === 0x80 && (fourthByte & 0xC0) === 0x80) {\n            tempCodePoint = (firstByte & 0xF) << 0x12 | (secondByte & 0x3F) << 0xC | (thirdByte & 0x3F) << 0x6 | (fourthByte & 0x3F)\n            if (tempCodePoint > 0xFFFF && tempCodePoint < 0x110000) {\n              codePoint = tempCodePoint\n            }\n          }\n      }\n    }\n\n    if (codePoint === null) {\n      // we did not generate a valid codePoint so insert a\n      // replacement char (U+FFFD) and advance only 1 byte\n      codePoint = 0xFFFD\n      bytesPerSequence = 1\n    } else if (codePoint > 0xFFFF) {\n      // encode to utf16 (surrogate pair dance)\n      codePoint -= 0x10000\n      res.push(codePoint >>> 10 & 0x3FF | 0xD800)\n      codePoint = 0xDC00 | codePoint & 0x3FF\n    }\n\n    res.push(codePoint)\n    i += bytesPerSequence\n  }\n\n  return decodeCodePointsArray(res)\n}\n\n// Based on http://stackoverflow.com/a/22747272/680742, the browser with\n// the lowest limit is Chrome, with 0x10000 args.\n// We go 1 magnitude less, for safety\nvar MAX_ARGUMENTS_LENGTH = 0x1000\n\nfunction decodeCodePointsArray (codePoints) {\n  var len = codePoints.length\n  if (len <= MAX_ARGUMENTS_LENGTH) {\n    return String.fromCharCode.apply(String, codePoints) // avoid extra slice()\n  }\n\n  // Decode in chunks to avoid \"call stack size exceeded\".\n  var res = ''\n  var i = 0\n  while (i < len) {\n    res += String.fromCharCode.apply(\n      String,\n      codePoints.slice(i, i += MAX_ARGUMENTS_LENGTH)\n    )\n  }\n  return res\n}\n\nfunction asciiSlice (buf, start, end) {\n  var ret = ''\n  end = Math.min(buf.length, end)\n\n  for (var i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i] & 0x7F)\n  }\n  return ret\n}\n\nfunction latin1Slice (buf, start, end) {\n  var ret = ''\n  end = Math.min(buf.length, end)\n\n  for (var i = start; i < end; ++i) {\n    ret += String.fromCharCode(buf[i])\n  }\n  return ret\n}\n\nfunction hexSlice (buf, start, end) {\n  var len = buf.length\n\n  if (!start || start < 0) start = 0\n  if (!end || end < 0 || end > len) end = len\n\n  var out = ''\n  for (var i = start; i < end; ++i) {\n    out += toHex(buf[i])\n  }\n  return out\n}\n\nfunction utf16leSlice (buf, start, end) {\n  var bytes = buf.slice(start, end)\n  var res = ''\n  for (var i = 0; i < bytes.length; i += 2) {\n    res += String.fromCharCode(bytes[i] + bytes[i + 1] * 256)\n  }\n  return res\n}\n\nBuffer.prototype.slice = function slice (start, end) {\n  var len = this.length\n  start = ~~start\n  end = end === undefined ? len : ~~end\n\n  if (start < 0) {\n    start += len\n    if (start < 0) start = 0\n  } else if (start > len) {\n    start = len\n  }\n\n  if (end < 0) {\n    end += len\n    if (end < 0) end = 0\n  } else if (end > len) {\n    end = len\n  }\n\n  if (end < start) end = start\n\n  var newBuf\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    newBuf = this.subarray(start, end)\n    newBuf.__proto__ = Buffer.prototype\n  } else {\n    var sliceLen = end - start\n    newBuf = new Buffer(sliceLen, undefined)\n    for (var i = 0; i < sliceLen; ++i) {\n      newBuf[i] = this[i + start]\n    }\n  }\n\n  return newBuf\n}\n\n/*\n * Need to make sure that buffer isn't trying to write out of bounds.\n */\nfunction checkOffset (offset, ext, length) {\n  if ((offset % 1) !== 0 || offset < 0) throw new RangeError('offset is not uint')\n  if (offset + ext > length) throw new RangeError('Trying to access beyond buffer length')\n}\n\nBuffer.prototype.readUIntLE = function readUIntLE (offset, byteLength, noAssert) {\n  offset = offset | 0\n  byteLength = byteLength | 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  var val = this[offset]\n  var mul = 1\n  var i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUIntBE = function readUIntBE (offset, byteLength, noAssert) {\n  offset = offset | 0\n  byteLength = byteLength | 0\n  if (!noAssert) {\n    checkOffset(offset, byteLength, this.length)\n  }\n\n  var val = this[offset + --byteLength]\n  var mul = 1\n  while (byteLength > 0 && (mul *= 0x100)) {\n    val += this[offset + --byteLength] * mul\n  }\n\n  return val\n}\n\nBuffer.prototype.readUInt8 = function readUInt8 (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  return this[offset]\n}\n\nBuffer.prototype.readUInt16LE = function readUInt16LE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return this[offset] | (this[offset + 1] << 8)\n}\n\nBuffer.prototype.readUInt16BE = function readUInt16BE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  return (this[offset] << 8) | this[offset + 1]\n}\n\nBuffer.prototype.readUInt32LE = function readUInt32LE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return ((this[offset]) |\n      (this[offset + 1] << 8) |\n      (this[offset + 2] << 16)) +\n      (this[offset + 3] * 0x1000000)\n}\n\nBuffer.prototype.readUInt32BE = function readUInt32BE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] * 0x1000000) +\n    ((this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    this[offset + 3])\n}\n\nBuffer.prototype.readIntLE = function readIntLE (offset, byteLength, noAssert) {\n  offset = offset | 0\n  byteLength = byteLength | 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  var val = this[offset]\n  var mul = 1\n  var i = 0\n  while (++i < byteLength && (mul *= 0x100)) {\n    val += this[offset + i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readIntBE = function readIntBE (offset, byteLength, noAssert) {\n  offset = offset | 0\n  byteLength = byteLength | 0\n  if (!noAssert) checkOffset(offset, byteLength, this.length)\n\n  var i = byteLength\n  var mul = 1\n  var val = this[offset + --i]\n  while (i > 0 && (mul *= 0x100)) {\n    val += this[offset + --i] * mul\n  }\n  mul *= 0x80\n\n  if (val >= mul) val -= Math.pow(2, 8 * byteLength)\n\n  return val\n}\n\nBuffer.prototype.readInt8 = function readInt8 (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 1, this.length)\n  if (!(this[offset] & 0x80)) return (this[offset])\n  return ((0xff - this[offset] + 1) * -1)\n}\n\nBuffer.prototype.readInt16LE = function readInt16LE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  var val = this[offset] | (this[offset + 1] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt16BE = function readInt16BE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 2, this.length)\n  var val = this[offset + 1] | (this[offset] << 8)\n  return (val & 0x8000) ? val | 0xFFFF0000 : val\n}\n\nBuffer.prototype.readInt32LE = function readInt32LE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset]) |\n    (this[offset + 1] << 8) |\n    (this[offset + 2] << 16) |\n    (this[offset + 3] << 24)\n}\n\nBuffer.prototype.readInt32BE = function readInt32BE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 4, this.length)\n\n  return (this[offset] << 24) |\n    (this[offset + 1] << 16) |\n    (this[offset + 2] << 8) |\n    (this[offset + 3])\n}\n\nBuffer.prototype.readFloatLE = function readFloatLE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, true, 23, 4)\n}\n\nBuffer.prototype.readFloatBE = function readFloatBE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 4, this.length)\n  return ieee754.read(this, offset, false, 23, 4)\n}\n\nBuffer.prototype.readDoubleLE = function readDoubleLE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, true, 52, 8)\n}\n\nBuffer.prototype.readDoubleBE = function readDoubleBE (offset, noAssert) {\n  if (!noAssert) checkOffset(offset, 8, this.length)\n  return ieee754.read(this, offset, false, 52, 8)\n}\n\nfunction checkInt (buf, value, offset, ext, max, min) {\n  if (!Buffer.isBuffer(buf)) throw new TypeError('\"buffer\" argument must be a Buffer instance')\n  if (value > max || value < min) throw new RangeError('\"value\" argument is out of bounds')\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n}\n\nBuffer.prototype.writeUIntLE = function writeUIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset | 0\n  byteLength = byteLength | 0\n  if (!noAssert) {\n    var maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  var mul = 1\n  var i = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUIntBE = function writeUIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset | 0\n  byteLength = byteLength | 0\n  if (!noAssert) {\n    var maxBytes = Math.pow(2, 8 * byteLength) - 1\n    checkInt(this, value, offset, byteLength, maxBytes, 0)\n  }\n\n  var i = byteLength - 1\n  var mul = 1\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    this[offset + i] = (value / mul) & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeUInt8 = function writeUInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0xff, 0)\n  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nfunction objectWriteUInt16 (buf, value, offset, littleEndian) {\n  if (value < 0) value = 0xffff + value + 1\n  for (var i = 0, j = Math.min(buf.length - offset, 2); i < j; ++i) {\n    buf[offset + i] = (value & (0xff << (8 * (littleEndian ? i : 1 - i)))) >>>\n      (littleEndian ? i : 1 - i) * 8\n  }\n}\n\nBuffer.prototype.writeUInt16LE = function writeUInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value & 0xff)\n    this[offset + 1] = (value >>> 8)\n  } else {\n    objectWriteUInt16(this, value, offset, true)\n  }\n  return offset + 2\n}\n\nBuffer.prototype.writeUInt16BE = function writeUInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0xffff, 0)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value >>> 8)\n    this[offset + 1] = (value & 0xff)\n  } else {\n    objectWriteUInt16(this, value, offset, false)\n  }\n  return offset + 2\n}\n\nfunction objectWriteUInt32 (buf, value, offset, littleEndian) {\n  if (value < 0) value = 0xffffffff + value + 1\n  for (var i = 0, j = Math.min(buf.length - offset, 4); i < j; ++i) {\n    buf[offset + i] = (value >>> (littleEndian ? i : 3 - i) * 8) & 0xff\n  }\n}\n\nBuffer.prototype.writeUInt32LE = function writeUInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset + 3] = (value >>> 24)\n    this[offset + 2] = (value >>> 16)\n    this[offset + 1] = (value >>> 8)\n    this[offset] = (value & 0xff)\n  } else {\n    objectWriteUInt32(this, value, offset, true)\n  }\n  return offset + 4\n}\n\nBuffer.prototype.writeUInt32BE = function writeUInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0xffffffff, 0)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value >>> 24)\n    this[offset + 1] = (value >>> 16)\n    this[offset + 2] = (value >>> 8)\n    this[offset + 3] = (value & 0xff)\n  } else {\n    objectWriteUInt32(this, value, offset, false)\n  }\n  return offset + 4\n}\n\nBuffer.prototype.writeIntLE = function writeIntLE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) {\n    var limit = Math.pow(2, 8 * byteLength - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  var i = 0\n  var mul = 1\n  var sub = 0\n  this[offset] = value & 0xFF\n  while (++i < byteLength && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i - 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeIntBE = function writeIntBE (value, offset, byteLength, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) {\n    var limit = Math.pow(2, 8 * byteLength - 1)\n\n    checkInt(this, value, offset, byteLength, limit - 1, -limit)\n  }\n\n  var i = byteLength - 1\n  var mul = 1\n  var sub = 0\n  this[offset + i] = value & 0xFF\n  while (--i >= 0 && (mul *= 0x100)) {\n    if (value < 0 && sub === 0 && this[offset + i + 1] !== 0) {\n      sub = 1\n    }\n    this[offset + i] = ((value / mul) >> 0) - sub & 0xFF\n  }\n\n  return offset + byteLength\n}\n\nBuffer.prototype.writeInt8 = function writeInt8 (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 1, 0x7f, -0x80)\n  if (!Buffer.TYPED_ARRAY_SUPPORT) value = Math.floor(value)\n  if (value < 0) value = 0xff + value + 1\n  this[offset] = (value & 0xff)\n  return offset + 1\n}\n\nBuffer.prototype.writeInt16LE = function writeInt16LE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value & 0xff)\n    this[offset + 1] = (value >>> 8)\n  } else {\n    objectWriteUInt16(this, value, offset, true)\n  }\n  return offset + 2\n}\n\nBuffer.prototype.writeInt16BE = function writeInt16BE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 2, 0x7fff, -0x8000)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value >>> 8)\n    this[offset + 1] = (value & 0xff)\n  } else {\n    objectWriteUInt16(this, value, offset, false)\n  }\n  return offset + 2\n}\n\nBuffer.prototype.writeInt32LE = function writeInt32LE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value & 0xff)\n    this[offset + 1] = (value >>> 8)\n    this[offset + 2] = (value >>> 16)\n    this[offset + 3] = (value >>> 24)\n  } else {\n    objectWriteUInt32(this, value, offset, true)\n  }\n  return offset + 4\n}\n\nBuffer.prototype.writeInt32BE = function writeInt32BE (value, offset, noAssert) {\n  value = +value\n  offset = offset | 0\n  if (!noAssert) checkInt(this, value, offset, 4, 0x7fffffff, -0x80000000)\n  if (value < 0) value = 0xffffffff + value + 1\n  if (Buffer.TYPED_ARRAY_SUPPORT) {\n    this[offset] = (value >>> 24)\n    this[offset + 1] = (value >>> 16)\n    this[offset + 2] = (value >>> 8)\n    this[offset + 3] = (value & 0xff)\n  } else {\n    objectWriteUInt32(this, value, offset, false)\n  }\n  return offset + 4\n}\n\nfunction checkIEEE754 (buf, value, offset, ext, max, min) {\n  if (offset + ext > buf.length) throw new RangeError('Index out of range')\n  if (offset < 0) throw new RangeError('Index out of range')\n}\n\nfunction writeFloat (buf, value, offset, littleEndian, noAssert) {\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 4, 3.4028234663852886e+38, -3.4028234663852886e+38)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 23, 4)\n  return offset + 4\n}\n\nBuffer.prototype.writeFloatLE = function writeFloatLE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeFloatBE = function writeFloatBE (value, offset, noAssert) {\n  return writeFloat(this, value, offset, false, noAssert)\n}\n\nfunction writeDouble (buf, value, offset, littleEndian, noAssert) {\n  if (!noAssert) {\n    checkIEEE754(buf, value, offset, 8, 1.7976931348623157E+308, -1.7976931348623157E+308)\n  }\n  ieee754.write(buf, value, offset, littleEndian, 52, 8)\n  return offset + 8\n}\n\nBuffer.prototype.writeDoubleLE = function writeDoubleLE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, true, noAssert)\n}\n\nBuffer.prototype.writeDoubleBE = function writeDoubleBE (value, offset, noAssert) {\n  return writeDouble(this, value, offset, false, noAssert)\n}\n\n// copy(targetBuffer, targetStart=0, sourceStart=0, sourceEnd=buffer.length)\nBuffer.prototype.copy = function copy (target, targetStart, start, end) {\n  if (!start) start = 0\n  if (!end && end !== 0) end = this.length\n  if (targetStart >= target.length) targetStart = target.length\n  if (!targetStart) targetStart = 0\n  if (end > 0 && end < start) end = start\n\n  // Copy 0 bytes; we're done\n  if (end === start) return 0\n  if (target.length === 0 || this.length === 0) return 0\n\n  // Fatal error conditions\n  if (targetStart < 0) {\n    throw new RangeError('targetStart out of bounds')\n  }\n  if (start < 0 || start >= this.length) throw new RangeError('sourceStart out of bounds')\n  if (end < 0) throw new RangeError('sourceEnd out of bounds')\n\n  // Are we oob?\n  if (end > this.length) end = this.length\n  if (target.length - targetStart < end - start) {\n    end = target.length - targetStart + start\n  }\n\n  var len = end - start\n  var i\n\n  if (this === target && start < targetStart && targetStart < end) {\n    // descending copy from end\n    for (i = len - 1; i >= 0; --i) {\n      target[i + targetStart] = this[i + start]\n    }\n  } else if (len < 1000 || !Buffer.TYPED_ARRAY_SUPPORT) {\n    // ascending copy from start\n    for (i = 0; i < len; ++i) {\n      target[i + targetStart] = this[i + start]\n    }\n  } else {\n    Uint8Array.prototype.set.call(\n      target,\n      this.subarray(start, start + len),\n      targetStart\n    )\n  }\n\n  return len\n}\n\n// Usage:\n//    buffer.fill(number[, offset[, end]])\n//    buffer.fill(buffer[, offset[, end]])\n//    buffer.fill(string[, offset[, end]][, encoding])\nBuffer.prototype.fill = function fill (val, start, end, encoding) {\n  // Handle string cases:\n  if (typeof val === 'string') {\n    if (typeof start === 'string') {\n      encoding = start\n      start = 0\n      end = this.length\n    } else if (typeof end === 'string') {\n      encoding = end\n      end = this.length\n    }\n    if (val.length === 1) {\n      var code = val.charCodeAt(0)\n      if (code < 256) {\n        val = code\n      }\n    }\n    if (encoding !== undefined && typeof encoding !== 'string') {\n      throw new TypeError('encoding must be a string')\n    }\n    if (typeof encoding === 'string' && !Buffer.isEncoding(encoding)) {\n      throw new TypeError('Unknown encoding: ' + encoding)\n    }\n  } else if (typeof val === 'number') {\n    val = val & 255\n  }\n\n  // Invalid ranges are not set to a default, so can range check early.\n  if (start < 0 || this.length < start || this.length < end) {\n    throw new RangeError('Out of range index')\n  }\n\n  if (end <= start) {\n    return this\n  }\n\n  start = start >>> 0\n  end = end === undefined ? this.length : end >>> 0\n\n  if (!val) val = 0\n\n  var i\n  if (typeof val === 'number') {\n    for (i = start; i < end; ++i) {\n      this[i] = val\n    }\n  } else {\n    var bytes = Buffer.isBuffer(val)\n      ? val\n      : utf8ToBytes(new Buffer(val, encoding).toString())\n    var len = bytes.length\n    for (i = 0; i < end - start; ++i) {\n      this[i + start] = bytes[i % len]\n    }\n  }\n\n  return this\n}\n\n// HELPER FUNCTIONS\n// ================\n\nvar INVALID_BASE64_RE = /[^+\\/0-9A-Za-z-_]/g\n\nfunction base64clean (str) {\n  // Node strips out invalid characters like \\n and \\t from the string, base64-js does not\n  str = stringtrim(str).replace(INVALID_BASE64_RE, '')\n  // Node converts strings with length < 2 to ''\n  if (str.length < 2) return ''\n  // Node allows for non-padded base64 strings (missing trailing ===), base64-js does not\n  while (str.length % 4 !== 0) {\n    str = str + '='\n  }\n  return str\n}\n\nfunction stringtrim (str) {\n  if (str.trim) return str.trim()\n  return str.replace(/^\\s+|\\s+$/g, '')\n}\n\nfunction toHex (n) {\n  if (n < 16) return '0' + n.toString(16)\n  return n.toString(16)\n}\n\nfunction utf8ToBytes (string, units) {\n  units = units || Infinity\n  var codePoint\n  var length = string.length\n  var leadSurrogate = null\n  var bytes = []\n\n  for (var i = 0; i < length; ++i) {\n    codePoint = string.charCodeAt(i)\n\n    // is surrogate component\n    if (codePoint > 0xD7FF && codePoint < 0xE000) {\n      // last char was a lead\n      if (!leadSurrogate) {\n        // no lead yet\n        if (codePoint > 0xDBFF) {\n          // unexpected trail\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        } else if (i + 1 === length) {\n          // unpaired lead\n          if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n          continue\n        }\n\n        // valid lead\n        leadSurrogate = codePoint\n\n        continue\n      }\n\n      // 2 leads in a row\n      if (codePoint < 0xDC00) {\n        if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n        leadSurrogate = codePoint\n        continue\n      }\n\n      // valid surrogate pair\n      codePoint = (leadSurrogate - 0xD800 << 10 | codePoint - 0xDC00) + 0x10000\n    } else if (leadSurrogate) {\n      // valid bmp char, but last char was a lead\n      if ((units -= 3) > -1) bytes.push(0xEF, 0xBF, 0xBD)\n    }\n\n    leadSurrogate = null\n\n    // encode utf8\n    if (codePoint < 0x80) {\n      if ((units -= 1) < 0) break\n      bytes.push(codePoint)\n    } else if (codePoint < 0x800) {\n      if ((units -= 2) < 0) break\n      bytes.push(\n        codePoint >> 0x6 | 0xC0,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x10000) {\n      if ((units -= 3) < 0) break\n      bytes.push(\n        codePoint >> 0xC | 0xE0,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else if (codePoint < 0x110000) {\n      if ((units -= 4) < 0) break\n      bytes.push(\n        codePoint >> 0x12 | 0xF0,\n        codePoint >> 0xC & 0x3F | 0x80,\n        codePoint >> 0x6 & 0x3F | 0x80,\n        codePoint & 0x3F | 0x80\n      )\n    } else {\n      throw new Error('Invalid code point')\n    }\n  }\n\n  return bytes\n}\n\nfunction asciiToBytes (str) {\n  var byteArray = []\n  for (var i = 0; i < str.length; ++i) {\n    // Node's code seems to be doing this and not & 0x7F..\n    byteArray.push(str.charCodeAt(i) & 0xFF)\n  }\n  return byteArray\n}\n\nfunction utf16leToBytes (str, units) {\n  var c, hi, lo\n  var byteArray = []\n  for (var i = 0; i < str.length; ++i) {\n    if ((units -= 2) < 0) break\n\n    c = str.charCodeAt(i)\n    hi = c >> 8\n    lo = c % 256\n    byteArray.push(lo)\n    byteArray.push(hi)\n  }\n\n  return byteArray\n}\n\nfunction base64ToBytes (str) {\n  return base64.toByteArray(base64clean(str))\n}\n\nfunction blitBuffer (src, dst, offset, length) {\n  for (var i = 0; i < length; ++i) {\n    if ((i + offset >= dst.length) || (i >= src.length)) break\n    dst[i + offset] = src[i]\n  }\n  return i\n}\n\nfunction isnan (val) {\n  return val !== val // eslint-disable-line no-self-compare\n}\n","'use strict'\n\nexports.byteLength = byteLength\nexports.toByteArray = toByteArray\nexports.fromByteArray = fromByteArray\n\nvar lookup = []\nvar revLookup = []\nvar Arr = typeof Uint8Array !== 'undefined' ? Uint8Array : Array\n\nvar code = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'\nfor (var i = 0, len = code.length; i < len; ++i) {\n  lookup[i] = code[i]\n  revLookup[code.charCodeAt(i)] = i\n}\n\n// Support decoding URL-safe base64 strings, as Node.js does.\n// See: https://en.wikipedia.org/wiki/Base64#URL_applications\nrevLookup['-'.charCodeAt(0)] = 62\nrevLookup['_'.charCodeAt(0)] = 63\n\nfunction getLens (b64) {\n  var len = b64.length\n\n  if (len % 4 > 0) {\n    throw new Error('Invalid string. Length must be a multiple of 4')\n  }\n\n  // Trim off extra bytes after placeholder bytes are found\n  // See: https://github.com/beatgammit/base64-js/issues/42\n  var validLen = b64.indexOf('=')\n  if (validLen === -1) validLen = len\n\n  var placeHoldersLen = validLen === len\n    ? 0\n    : 4 - (validLen % 4)\n\n  return [validLen, placeHoldersLen]\n}\n\n// base64 is 4/3 + up to two characters of the original data\nfunction byteLength (b64) {\n  var lens = getLens(b64)\n  var validLen = lens[0]\n  var placeHoldersLen = lens[1]\n  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen\n}\n\nfunction _byteLength (b64, validLen, placeHoldersLen) {\n  return ((validLen + placeHoldersLen) * 3 / 4) - placeHoldersLen\n}\n\nfunction toByteArray (b64) {\n  var tmp\n  var lens = getLens(b64)\n  var validLen = lens[0]\n  var placeHoldersLen = lens[1]\n\n  var arr = new Arr(_byteLength(b64, validLen, placeHoldersLen))\n\n  var curByte = 0\n\n  // if there are placeholders, only get up to the last complete 4 chars\n  var len = placeHoldersLen > 0\n    ? validLen - 4\n    : validLen\n\n  for (var i = 0; i < len; i += 4) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 18) |\n      (revLookup[b64.charCodeAt(i + 1)] << 12) |\n      (revLookup[b64.charCodeAt(i + 2)] << 6) |\n      revLookup[b64.charCodeAt(i + 3)]\n    arr[curByte++] = (tmp >> 16) & 0xFF\n    arr[curByte++] = (tmp >> 8) & 0xFF\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  if (placeHoldersLen === 2) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 2) |\n      (revLookup[b64.charCodeAt(i + 1)] >> 4)\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  if (placeHoldersLen === 1) {\n    tmp =\n      (revLookup[b64.charCodeAt(i)] << 10) |\n      (revLookup[b64.charCodeAt(i + 1)] << 4) |\n      (revLookup[b64.charCodeAt(i + 2)] >> 2)\n    arr[curByte++] = (tmp >> 8) & 0xFF\n    arr[curByte++] = tmp & 0xFF\n  }\n\n  return arr\n}\n\nfunction tripletToBase64 (num) {\n  return lookup[num >> 18 & 0x3F] +\n    lookup[num >> 12 & 0x3F] +\n    lookup[num >> 6 & 0x3F] +\n    lookup[num & 0x3F]\n}\n\nfunction encodeChunk (uint8, start, end) {\n  var tmp\n  var output = []\n  for (var i = start; i < end; i += 3) {\n    tmp =\n      ((uint8[i] << 16) & 0xFF0000) +\n      ((uint8[i + 1] << 8) & 0xFF00) +\n      (uint8[i + 2] & 0xFF)\n    output.push(tripletToBase64(tmp))\n  }\n  return output.join('')\n}\n\nfunction fromByteArray (uint8) {\n  var tmp\n  var len = uint8.length\n  var extraBytes = len % 3 // if we have 1 byte left, pad 2 bytes\n  var parts = []\n  var maxChunkLength = 16383 // must be multiple of 3\n\n  // go through the array every three bytes, we'll deal with trailing stuff later\n  for (var i = 0, len2 = len - extraBytes; i < len2; i += maxChunkLength) {\n    parts.push(encodeChunk(\n      uint8, i, (i + maxChunkLength) > len2 ? len2 : (i + maxChunkLength)\n    ))\n  }\n\n  // pad the end with zeros, but make sure to not forget the extra bytes\n  if (extraBytes === 1) {\n    tmp = uint8[len - 1]\n    parts.push(\n      lookup[tmp >> 2] +\n      lookup[(tmp << 4) & 0x3F] +\n      '=='\n    )\n  } else if (extraBytes === 2) {\n    tmp = (uint8[len - 2] << 8) + uint8[len - 1]\n    parts.push(\n      lookup[tmp >> 10] +\n      lookup[(tmp >> 4) & 0x3F] +\n      lookup[(tmp << 2) & 0x3F] +\n      '='\n    )\n  }\n\n  return parts.join('')\n}\n","var toString = {}.toString;\n\nmodule.exports = Array.isArray || function (arr) {\n  return toString.call(arr) == '[object Array]';\n};\n","(function (global, factory) {\n\ttypeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :\n\ttypeof define === 'function' && define.amd ? define(factory) :\n\t(global.quickselect = factory());\n}(this, (function () { 'use strict';\n\nfunction quickselect(arr, k, left, right, compare) {\n    quickselectStep(arr, k, left || 0, right || (arr.length - 1), compare || defaultCompare);\n}\n\nfunction quickselectStep(arr, k, left, right, compare) {\n\n    while (right > left) {\n        if (right - left > 600) {\n            var n = right - left + 1;\n            var m = k - left + 1;\n            var z = Math.log(n);\n            var s = 0.5 * Math.exp(2 * z / 3);\n            var sd = 0.5 * Math.sqrt(z * s * (n - s) / n) * (m - n / 2 < 0 ? -1 : 1);\n            var newLeft = Math.max(left, Math.floor(k - m * s / n + sd));\n            var newRight = Math.min(right, Math.floor(k + (n - m) * s / n + sd));\n            quickselectStep(arr, k, newLeft, newRight, compare);\n        }\n\n        var t = arr[k];\n        var i = left;\n        var j = right;\n\n        swap(arr, left, k);\n        if (compare(arr[right], t) > 0) swap(arr, left, right);\n\n        while (i < j) {\n            swap(arr, i, j);\n            i++;\n            j--;\n            while (compare(arr[i], t) < 0) i++;\n            while (compare(arr[j], t) > 0) j--;\n        }\n\n        if (compare(arr[left], t) === 0) swap(arr, left, j);\n        else {\n            j++;\n            swap(arr, j, right);\n        }\n\n        if (j <= k) left = j + 1;\n        if (k <= j) right = j - 1;\n    }\n}\n\nfunction swap(arr, i, j) {\n    var tmp = arr[i];\n    arr[i] = arr[j];\n    arr[j] = tmp;\n}\n\nfunction defaultCompare(a, b) {\n    return a < b ? -1 : a > b ? 1 : 0;\n}\n\nreturn quickselect;\n\n})));\n"],"sourceRoot":""}