phaser
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A fast, free and fun HTML5 Game Framework for Desktop and Mobile web browsers.
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JavaScript
/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2018 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
/**
* Provides methods used for getting and setting the transform values of a Game Object.
* Should be applied as a mixin and not used directly.
*
* @name Phaser.GameObjects.Components.MatrixStack
* @since 3.2.0
*/
var MatrixStack = {
/**
* [description]
*
* @name Phaser.GameObjects.Components.MatrixStack#matrixStack
* @type {Float32Array}
* @private
* @since 3.2.0
*/
matrixStack: null,
/**
* [description]
*
* @name Phaser.GameObjects.Components.MatrixStack#currentMatrix
* @type {Float32Array}
* @private
* @since 3.2.0
*/
currentMatrix: null,
/**
* [description]
*
* @name Phaser.GameObjects.Components.MatrixStack#currentMatrixIndex
* @type {integer}
* @private
* @since 3.2.0
*/
currentMatrixIndex: 0,
/**
* [description]
*
* @method Phaser.GameObjects.Components.MatrixStack#initMatrixStack
* @since 3.2.0
*
* @return {Phaser.GameObjects.GameObject} This Game Object instance.
*/
initMatrixStack: function ()
{
this.matrixStack = new Float32Array(6000); // up to 1000 matrices
this.currentMatrix = new Float32Array([ 1, 0, 0, 1, 0, 0 ]);
this.currentMatrixIndex = 0;
return this;
},
/**
* [description]
*
* @method Phaser.GameObjects.Components.MatrixStack#save
* @since 3.2.0
*
* @return {Phaser.GameObjects.GameObject} This Game Object instance.
*/
save: function ()
{
if (this.currentMatrixIndex >= this.matrixStack.length) { return this; }
var matrixStack = this.matrixStack;
var currentMatrix = this.currentMatrix;
var currentMatrixIndex = this.currentMatrixIndex;
this.currentMatrixIndex += 6;
matrixStack[currentMatrixIndex + 0] = currentMatrix[0];
matrixStack[currentMatrixIndex + 1] = currentMatrix[1];
matrixStack[currentMatrixIndex + 2] = currentMatrix[2];
matrixStack[currentMatrixIndex + 3] = currentMatrix[3];
matrixStack[currentMatrixIndex + 4] = currentMatrix[4];
matrixStack[currentMatrixIndex + 5] = currentMatrix[5];
return this;
},
/**
* [description]
*
* @method Phaser.GameObjects.Components.MatrixStack#restore
* @since 3.2.0
*
* @return {Phaser.GameObjects.GameObject} This Game Object instance.
*/
restore: function ()
{
if (this.currentMatrixIndex <= 0) { return this; }
this.currentMatrixIndex -= 6;
var matrixStack = this.matrixStack;
var currentMatrix = this.currentMatrix;
var currentMatrixIndex = this.currentMatrixIndex;
currentMatrix[0] = matrixStack[currentMatrixIndex + 0];
currentMatrix[1] = matrixStack[currentMatrixIndex + 1];
currentMatrix[2] = matrixStack[currentMatrixIndex + 2];
currentMatrix[3] = matrixStack[currentMatrixIndex + 3];
currentMatrix[4] = matrixStack[currentMatrixIndex + 4];
currentMatrix[5] = matrixStack[currentMatrixIndex + 5];
return this;
},
/**
* [description]
*
* @method Phaser.GameObjects.Components.MatrixStack#loadIdentity
* @since 3.2.0
*
* @return {Phaser.GameObjects.GameObject} This Game Object instance.
*/
loadIdentity: function ()
{
this.setTransform(1, 0, 0, 1, 0, 0);
return this;
},
/**
* [description]
*
* @method Phaser.GameObjects.Components.MatrixStack#transform
* @since 3.2.0
*
* @param {number} a - [description]
* @param {number} b - [description]
* @param {number} c - [description]
* @param {number} d - [description]
* @param {number} tx - [description]
* @param {number} ty - [description]
*
* @return {Phaser.GameObjects.GameObject} This Game Object instance.
*/
transform: function (a, b, c, d, tx, ty)
{
var currentMatrix = this.currentMatrix;
var m0 = currentMatrix[0];
var m1 = currentMatrix[1];
var m2 = currentMatrix[2];
var m3 = currentMatrix[3];
var m4 = currentMatrix[4];
var m5 = currentMatrix[5];
currentMatrix[0] = m0 * a + m2 * b;
currentMatrix[1] = m1 * a + m3 * b;
currentMatrix[2] = m0 * c + m2 * d;
currentMatrix[3] = m1 * c + m3 * d;
currentMatrix[4] = m0 * tx + m2 * ty + m4;
currentMatrix[5] = m1 * tx + m3 * ty + m5;
return this;
},
/**
* [description]
*
* @method Phaser.GameObjects.Components.MatrixStack#setTransform
* @since 3.2.0
*
* @param {number} a - [description]
* @param {number} b - [description]
* @param {number} c - [description]
* @param {number} d - [description]
* @param {number} tx - [description]
* @param {number} ty - [description]
*
* @return {Phaser.GameObjects.GameObject} This Game Object instance.
*/
setTransform: function (a, b, c, d, tx, ty)
{
var currentMatrix = this.currentMatrix;
currentMatrix[0] = a;
currentMatrix[1] = b;
currentMatrix[2] = c;
currentMatrix[3] = d;
currentMatrix[4] = tx;
currentMatrix[5] = ty;
return this;
},
/**
* [description]
*
* @method Phaser.GameObjects.Components.MatrixStack#translate
* @since 3.2.0
*
* @param {number} x - [description]
* @param {number} y - [description]
*
* @return {Phaser.GameObjects.GameObject} This Game Object instance.
*/
translate: function (x, y)
{
var currentMatrix = this.currentMatrix;
var m0 = currentMatrix[0];
var m1 = currentMatrix[1];
var m2 = currentMatrix[2];
var m3 = currentMatrix[3];
var m4 = currentMatrix[4];
var m5 = currentMatrix[5];
currentMatrix[4] = m0 * x + m2 * y + m4;
currentMatrix[5] = m1 * x + m3 * y + m5;
return this;
},
/**
* [description]
*
* @method Phaser.GameObjects.Components.MatrixStack#scale
* @since 3.2.0
*
* @param {number} x - [description]
* @param {number} y - [description]
*
* @return {Phaser.GameObjects.GameObject} This Game Object instance.
*/
scale: function (x, y)
{
var currentMatrix = this.currentMatrix;
var m0 = currentMatrix[0];
var m1 = currentMatrix[1];
var m2 = currentMatrix[2];
var m3 = currentMatrix[3];
currentMatrix[0] = m0 * x;
currentMatrix[1] = m1 * x;
currentMatrix[2] = m2 * y;
currentMatrix[3] = m3 * y;
return this;
},
/**
* [description]
*
* @method Phaser.GameObjects.Components.MatrixStack#rotate
* @since 3.2.0
*
* @param {number} t - The angle of rotation, in radians.
*
* @return {Phaser.GameObjects.GameObject} This Game Object instance.
*/
rotate: function (t)
{
var currentMatrix = this.currentMatrix;
var m0 = currentMatrix[0];
var m1 = currentMatrix[1];
var m2 = currentMatrix[2];
var m3 = currentMatrix[3];
var st = Math.sin(t);
var ct = Math.cos(t);
currentMatrix[0] = m0 * ct + m2 * st;
currentMatrix[1] = m1 * ct + m3 * st;
currentMatrix[2] = m0 * -st + m2 * ct;
currentMatrix[3] = m1 * -st + m3 * ct;
return this;
}
};
module.exports = MatrixStack;