1 /****************************************************************************
  2  Copyright (c) 2011-2012 cocos2d-x.org
  3  Copyright (c) 2013-2014 Chukong Technologies Inc.
  4 
  5  http://www.cocos2d-x.org
  6 
  7  Permission is hereby granted, free of charge, to any person obtaining a copy
  8  of this software and associated documentation files (the "Software"), to deal
  9  in the Software without restriction, including without limitation the rights
 10  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 11  copies of the Software, and to permit persons to whom the Software is
 12  furnished to do so, subject to the following conditions:
 13 
 14  The above copyright notice and this permission notice shall be included in
 15  all copies or substantial portions of the Software.
 16 
 17  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 18  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 19  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 20  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 21  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 22  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 23  THE SOFTWARE.
 24  ****************************************************************************/
 25 
 26 /**
 27  * @ignore
 28  */
 29 ccs.TransformHelp = ccs.TransformHelp || ccs.Class.extend({});
 30 
 31 ccs.TransformHelp.helpMatrix1 = cc.AffineTransformMake(1, 0, 0, 1, 0, 0);
 32 ccs.TransformHelp.helpMatrix2 = cc.AffineTransformMake(1, 0, 0, 1, 0, 0);
 33 ccs.TransformHelp.helpPoint1 = cc.p(0, 0);
 34 ccs.TransformHelp.helpPoint2 = cc.p(0, 0);
 35 
 36 /**
 37  * @function
 38  * @param {ccs.BaseData} bone
 39  * @return {cc.AffineTransform}
 40  * Constructor
 41  */
 42 ccs.TransformHelp.transformFromParent = function (bone, parentBone) {
 43     this.nodeToMatrix(bone, this.helpMatrix1);
 44     this.nodeToMatrix(parentBone, this.helpMatrix2);
 45 
 46     this.helpMatrix2 = cc.AffineTransformInvert(this.helpMatrix2);
 47     this.helpMatrix1 = cc.AffineTransformConcat(this.helpMatrix1, this.helpMatrix2);
 48 
 49     this.matrixToNode(this.helpMatrix1, bone);
 50 };
 51 
 52 /**
 53  * @function
 54  * @param {ccs.BaseData} node
 55  * @param {cc.AffineTransform} matrix
 56  */
 57 ccs.TransformHelp.nodeToMatrix = function (node, matrix) {
 58     if (node.skewX == -node.skewY) {
 59         var sine = Math.sin(node.skewX);
 60         var cosine = Math.cos(node.skewX);
 61         matrix.a = node.scaleX * cosine;
 62         matrix.b = node.scaleX * -sine;
 63         matrix.c = node.scaleY * sine;
 64         matrix.d = node.scaleY * cosine;
 65     } else {
 66         matrix.a = node.scaleX * Math.cos(node.skewY);
 67         matrix.b = node.scaleX * Math.sin(node.skewY);
 68         matrix.c = node.scaleY * Math.sin(node.skewX);
 69         matrix.d = node.scaleY * Math.cos(node.skewY);
 70     }
 71     matrix.tx = node.x;
 72     matrix.ty = node.y;
 73 };
 74 
 75 /**
 76  * @function
 77  * @param {cc.AffineTransform} matrix
 78  * @param {ccs.BaseData} node
 79  */
 80 ccs.TransformHelp.matrixToNode = function (matrix, node) {
 81     /*
 82      *  In as3 language, there is a function called "deltaTransformPoint", it calculate a point used give Transform
 83      *  but not used the tx, ty value. we simulate the function here
 84      */
 85     this.helpPoint1.x = 0;
 86     this.helpPoint1.y = 1;
 87     this.helpPoint1 = cc.PointApplyAffineTransform(this.helpPoint1, matrix);
 88     this.helpPoint1.x -= matrix.tx;
 89     this.helpPoint1.y -= matrix.ty;
 90 
 91     this.helpPoint2.x = 1;
 92     this.helpPoint2.y = 0;
 93     this.helpPoint2 = cc.PointApplyAffineTransform(this.helpPoint2, matrix);
 94     this.helpPoint2.x -= matrix.tx;
 95     this.helpPoint2.y -= matrix.ty;
 96 
 97     node.skewX = -(Math.atan2(this.helpPoint1.y, this.helpPoint1.x) - 1.5707964); //todo
 98     //node.skewX = -Math.atan2(this.helpPoint2.y, this.helpPoint2.x);
 99     node.skewY = Math.atan2(this.helpPoint2.y, this.helpPoint2.x);
100     node.scaleX = Math.sqrt(matrix.a * matrix.a + matrix.b * matrix.b);
101     node.scaleY = Math.sqrt(matrix.c * matrix.c + matrix.d * matrix.d);
102     node.x = matrix.tx;
103     node.y = matrix.ty;
104 };
105 
106 /**
107  * @function
108  * @param {ccs.BaseData} target
109  * @param {ccs.BaseData} source
110  */
111 ccs.TransformHelp.nodeConcat = function (target, source) {
112     target.x += source.x;
113     target.y += source.y;
114     target.skewX += source.skewX;
115     target.skewY += source.skewY;
116     target.scaleX += source.scaleX;
117     target.scaleY += source.scaleY;
118 };
119 
120 /**
121  * @function
122  * @param {ccs.BaseData} target
123  * @param {ccs.BaseData} source
124  */
125 ccs.TransformHelp.nodeSub = function (target, source) {
126     target.x -= source.x;
127     target.y -= source.y;
128     target.skewX -= source.skewX;
129     target.skewY -= source.skewY;
130     target.scaleX -= source.scaleX;
131     target.scaleY -= source.scaleY;
132 };