Class Matrix3

Defined in: lina.js.

Class Summary
Constructor Attributes	Constructor Name and Description
	Matrix3(m) Creates a new 3x3 matrix for transforming in 2d space.

Field Summary
Field Attributes	Field Name and Description
	isAffine Defines, if this matrix is non-perspective, i.e.
	m Matrix value stored as array of 9 floats.

Method Summary
Method Attributes	Method Name and Description
	copy() Create and return a copy of this matrix.
	det() Calculate the determinant.
	invert() Invert (in-place) and return this instance.
	mult(mb) Apply transformation (in-place) and return this instance.
	orientation() Calculate the vector (dx:0, dy:1) tranformed by this.
	reset() Reset the current matrix to identity.
	rotate(a, pt) Apply rotation (in-place) and return this instance.
	scale(fx, fy) Apply scaling (in-place) and return this instance.
	set(m) Set the current matrix.
	toString() Return string representation '[[0, 1, 2], [3, 4, 5], [6, 7, 8]]'.
	transformPt(x, y) Return transformed x and y as JS-object {x:x', y:y'}.
	transformVec(dx, dy) Return transformed dx and dy as JS-object {dx:_, dy:_}.
	translate(dx, dy) Apply translation (in-place) and return this instance.
	transpose() Transpose (in-place) and return this instance.

Class Detail

Matrix3(m)

Creates a new 3x3 matrix for transforming in 2d space.

[1  0  0,
 0  1  0,
 Tx Ty 1]

Scale:

[Sx 0  0,
 0  Sy 0,
 0  0  1]

Rotation:

[ c  s 0,
 -s  c 0,
  0  0 1]

Parameters:
{undefined|Matrix3|float[9]} m: Translation:

Field Detail

isAffine

Defines, if this matrix is non-perspective, i.e. the right column is [0, 0, 1] so that m[2] = m[5] = 0 and m[8] = 1. In this case transformations can be processed more efficiently. Default: true.

Matrix value stored as array of 9 floats.

Method Detail

copy()

Create and return a copy of this matrix.

{float} det()

Calculate the determinant.

Returns:: {float}

{Matrix3} invert()

Invert (in-place) and return this instance.

Throws:
: "Cannot invert", if det(m) == 0

Returns:: {Matrix3}

mult(mb)

Apply transformation (in-place) and return this instance.

Parameters:
mb

{Vec2} orientation()

Calculate the vector (dx:0, dy:1) tranformed by this.

Returns:: {Vec2}

{Matrix3} reset()

Reset the current matrix to identity.

Returns:: {Matrix3}

rotate(a, pt)

Apply rotation (in-place) and return this instance.

Parameters:
a
pt

scale(fx, fy)

Apply scaling (in-place) and return this instance.

Parameters:
fx
fy

{Matrix3} set(m)

Set the current matrix.

Parameters:
{Matrix3|float[9]} m: (optional) defaults to identity matrix [1, 0, 0, 0, 1, 0, 0, 0, 1]

Returns:: {Matrix3}

{string} toString()

Return string representation '[[0, 1, 2], [3, 4, 5], [6, 7, 8]]'.

Returns:: {string}

transformPt(x, y)

Return transformed x and y as JS-object {x:x', y:y'}.

Parameters:
x
y

transformVec(dx, dy)

Return transformed dx and dy as JS-object {dx:_, dy:_}.

Parameters:
dx
dy

translate(dx, dy)

Apply translation (in-place) and return this instance.

Parameters:
dx
dy

transpose()

Transpose (in-place) and return this instance.

Classes

Class Matrix3