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phaser/docs/src_geom_Matrix.js.html
photonstorm e33455e34f 2.3.0 API Docs
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<h1 class="page-title">Source: src/geom/Matrix.js</h1>
<section>
<article>
<pre class="sunlight-highlight-javascript linenums">/**
* @author Mat Groves http://matgroves.com/ @Doormat23
*/
/**
* The Matrix class is now an object, which makes it a lot faster,
* here is a representation of it :
* | a | b | tx|
* | c | d | ty|
* | 0 | 0 | 1 |
*
* @class Matrix
* @constructor
*/
Phaser.Matrix = function()
{
/**
* @property a
* @type Number
* @default 1
*/
this.a = 1;
/**
* @property b
* @type Number
* @default 0
*/
this.b = 0;
/**
* @property c
* @type Number
* @default 0
*/
this.c = 0;
/**
* @property d
* @type Number
* @default 1
*/
this.d = 1;
/**
* @property tx
* @type Number
* @default 0
*/
this.tx = 0;
/**
* @property ty
* @type Number
* @default 0
*/
this.ty = 0;
/**
* @property {number} type - The const type of this object.
* @readonly
*/
this.type = Phaser.MATRIX;
};
/**
* Creates a Matrix object based on the given array. The Element to Matrix mapping order is as follows:
*
* a = array[0]
* b = array[1]
* c = array[3]
* d = array[4]
* tx = array[2]
* ty = array[5]
*
* @method fromArray
* @param array {Array} The array that the matrix will be populated from.
*/
Phaser.Matrix.prototype.fromArray = function(array)
{
this.a = array[0];
this.b = array[1];
this.c = array[3];
this.d = array[4];
this.tx = array[2];
this.ty = array[5];
};
/**
* Creates an array from the current Matrix object.
*
* @method toArray
* @param transpose {Boolean} Whether we need to transpose the matrix or not
* @return {Array} the newly created array which contains the matrix
*/
Phaser.Matrix.prototype.toArray = function(transpose)
{
if (!this.array)
{
this.array = new PIXI.Float32Array(9);
}
var array = this.array;
if (transpose)
{
array[0] = this.a;
array[1] = this.b;
array[2] = 0;
array[3] = this.c;
array[4] = this.d;
array[5] = 0;
array[6] = this.tx;
array[7] = this.ty;
array[8] = 1;
}
else
{
array[0] = this.a;
array[1] = this.c;
array[2] = this.tx;
array[3] = this.b;
array[4] = this.d;
array[5] = this.ty;
array[6] = 0;
array[7] = 0;
array[8] = 1;
}
return array;
};
/**
* Get a new position with the current transformation applied.
* Can be used to go from a child's coordinate space to the world coordinate space. (e.g. rendering)
*
* @method apply
* @param pos {Point} The origin
* @param [newPos] {Point} The point that the new position is assigned to (allowed to be same as input)
* @return {Point} The new point, transformed through this matrix
*/
Phaser.Matrix.prototype.apply = function(pos, newPos)
{
newPos = newPos || new Phaser.Point();
var x = pos.x;
var y = pos.y;
newPos.x = this.a * x + this.c * y + this.tx;
newPos.y = this.b * x + this.d * y + this.ty;
return newPos;
};
/**
* Get a new position with the inverse of the current transformation applied.
* Can be used to go from the world coordinate space to a child's coordinate space. (e.g. input)
*
* @method applyInverse
* @param pos {Point} The origin
* @param [newPos] {Point} The point that the new position is assigned to (allowed to be same as input)
* @return {Point} The new point, inverse-transformed through this matrix
*/
Phaser.Matrix.prototype.applyInverse = function(pos, newPos)
{
newPos = newPos || new Phaser.Point();
var id = 1 / (this.a * this.d + this.c * -this.b);
var x = pos.x;
var y = pos.y;
newPos.x = this.d * id * x + -this.c * id * y + (this.ty * this.c - this.tx * this.d) * id;
newPos.y = this.a * id * y + -this.b * id * x + (-this.ty * this.a + this.tx * this.b) * id;
return newPos;
};
/**
* Translates the matrix on the x and y.
*
* @method translate
* @param {Number} x
* @param {Number} y
* @return {Matrix} This matrix. Good for chaining method calls.
**/
Phaser.Matrix.prototype.translate = function(x, y)
{
this.tx += x;
this.ty += y;
return this;
};
/**
* Applies a scale transformation to the matrix.
*
* @method scale
* @param {Number} x The amount to scale horizontally
* @param {Number} y The amount to scale vertically
* @return {Matrix} This matrix. Good for chaining method calls.
**/
Phaser.Matrix.prototype.scale = function(x, y)
{
this.a *= x;
this.d *= y;
this.c *= x;
this.b *= y;
this.tx *= x;
this.ty *= y;
return this;
};
/**
* Applies a rotation transformation to the matrix.
* @method rotate
* @param {Number} angle The angle in radians.
* @return {Matrix} This matrix. Good for chaining method calls.
**/
Phaser.Matrix.prototype.rotate = function(angle)
{
var cos = Math.cos( angle );
var sin = Math.sin( angle );
var a1 = this.a;
var c1 = this.c;
var tx1 = this.tx;
this.a = a1 * cos-this.b * sin;
this.b = a1 * sin+this.b * cos;
this.c = c1 * cos-this.d * sin;
this.d = c1 * sin+this.d * cos;
this.tx = tx1 * cos - this.ty * sin;
this.ty = tx1 * sin + this.ty * cos;
return this;
};
/**
* Appends the given Matrix to this Matrix.
*
* @method append
* @param {Matrix} matrix
* @return {Matrix} This matrix. Good for chaining method calls.
*/
Phaser.Matrix.prototype.append = function(matrix)
{
var a1 = this.a;
var b1 = this.b;
var c1 = this.c;
var d1 = this.d;
this.a = matrix.a * a1 + matrix.b * c1;
this.b = matrix.a * b1 + matrix.b * d1;
this.c = matrix.c * a1 + matrix.d * c1;
this.d = matrix.c * b1 + matrix.d * d1;
this.tx = matrix.tx * a1 + matrix.ty * c1 + this.tx;
this.ty = matrix.tx * b1 + matrix.ty * d1 + this.ty;
return this;
};
/**
* Resets this Matix to an identity (default) matrix.
*
* @method identity
* @return {Matrix} This matrix. Good for chaining method calls.
*/
Phaser.Matrix.prototype.identity = function()
{
this.a = 1;
this.b = 0;
this.c = 0;
this.d = 1;
this.tx = 0;
this.ty = 0;
return this;
};
Phaser.identityMatrix = new Phaser.Matrix();
// Because PIXI uses its own type, we'll replace it with ours to avoid duplicating code or confusion.
PIXI.Matrix = Phaser.Matrix;
PIXI.identityMatrix = Phaser.identityMatrix;
</pre>
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