source : transit-layer.js

/**
 * @ngdoc directive
 * @name transit-layer
 * @param Attr2MapOptions {service} convert html attribute to Google map api options
 * @description
 *   Requires:  map directive
 *   Restrict To:  Element
 *
 * @example
 * Example:
 *
 *  <map zoom="13" center="34.04924594193164, -118.24104309082031">
 *    <transit-layer></transit-layer>
 *  </map>
 */
(function() {
  'use strict';
  angular.module('ngMap').directive('transitLayer', [
    'Attr2MapOptions', function(Attr2MapOptions) {
    var parser = Attr2MapOptions;
    var getLayer = function(options, events) {
      var layer = new google.maps.TransitLayer(options);
      for (var eventName in events) {
        google.maps.event.addListener(layer, eventName, events[eventName]);
      }
      return layer;
    };
    return {
      restrict: 'E',
      require: ['?^map','?^ngMap'],
      link: function(scope, element, attrs, mapController) {
        mapController = mapController[0]||mapController[1];
        var orgAttrs = parser.orgAttributes(element);
        var filtered = parser.filter(attrs);
        var options = parser.getOptions(filtered, {scope: scope});
        var events = parser.getEvents(scope, filtered);
        console.log('transit-layer options', options, 'events', events);
        var layer = getLayer(options, events);
        mapController.addObject('transitLayers', layer);
        mapController.observeAttrSetObj(orgAttrs, attrs, layer);  //observers
        element.bind('$destroy', function() {
          mapController.deleteObject('transitLayers', layer);
        });
      }
     }; // return
  }]);
})();