1 /****************************************************************************
  2  Copyright (c) 2010-2012 cocos2d-x.org
  3 
  4  http://www.cocos2d-x.org
  5 
  6  Permission is hereby granted, free of charge, to any person obtaining a copy
  7  of this software and associated documentation files (the "Software"), to deal
  8  in the Software without restriction, including without limitation the rights
  9  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 10  copies of the Software, and to permit persons to whom the Software is
 11  furnished to do so, subject to the following conditions:
 12 
 13  The above copyright notice and this permission notice shall be included in
 14  all copies or substantial portions of the Software.
 15 
 16  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 17  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 18  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 19  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 20  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 21  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 22  THE SOFTWARE.
 23  ****************************************************************************/
 24 
 25 ccs.TransformHelp = ccs.TransformHelp || ccs.Class.extend({});
 26 
 27 ccs.TransformHelp.helpMatrix1 = cc.AffineTransformMake(1, 0, 0, 1, 0, 0);
 28 ccs.TransformHelp.helpMatrix2 = cc.AffineTransformMake(1, 0, 0, 1, 0, 0);
 29 ccs.TransformHelp.helpPoint1 = cc.p(0, 0);
 30 ccs.TransformHelp.helpPoint2 = cc.p(0, 0);
 31 
 32 /**
 33  * @function
 34  * @param {ccs.BaseData} bone
 35  * @return {cc.AffineTransform}
 36  * Constructor
 37  */
 38 ccs.TransformHelp.transformFromParent = function (bone, parentBone) {
 39     this.nodeToMatrix(bone, this.helpMatrix1);
 40     this.nodeToMatrix(parentBone, this.helpMatrix2);
 41 
 42     this.helpMatrix2 = cc.AffineTransformInvert(this.helpMatrix2);
 43     this.helpMatrix1 = cc.AffineTransformConcat(this.helpMatrix1, this.helpMatrix2);
 44 
 45     this.matrixToNode(this.helpMatrix1, bone);
 46 };
 47 
 48 /**
 49  * @function
 50  * @param {ccs.BaseData} node
 51  * @param {cc.AffineTransform} matrix
 52  */
 53 ccs.TransformHelp.nodeToMatrix = function (node, matrix) {
 54     if (node.skewX == -node.skewY) {
 55         var sine = Math.sin(node.skewX);
 56         var cosine = Math.cos(node.skewX);
 57         matrix.a = node.scaleX * cosine;
 58         matrix.b = node.scaleX * -sine;
 59         matrix.c = node.scaleY * sine;
 60         matrix.d = node.scaleY * cosine;
 61     } else {
 62         matrix.a = node.scaleX * Math.cos(node.skewY);
 63         matrix.b = node.scaleX * Math.sin(node.skewY);
 64         matrix.c = node.scaleY * Math.sin(node.skewX);
 65         matrix.d = node.scaleY * Math.cos(node.skewY);
 66     }
 67     matrix.tx = node.x;
 68     matrix.ty = node.y;
 69 };
 70 
 71 /**
 72  * @function
 73  * @param {cc.AffineTransform} matrix
 74  * @param {ccs.BaseData} node
 75  */
 76 ccs.TransformHelp.matrixToNode = function (matrix, node) {
 77     /*
 78      *  In as3 language, there is a function called "deltaTransformPoint", it calculate a point used give Transform
 79      *  but not used the tx, ty value. we simulate the function here
 80      */
 81     this.helpPoint1.x = 0;
 82     this.helpPoint1.y = 1;
 83     this.helpPoint1 = cc.PointApplyAffineTransform(this.helpPoint1, matrix);
 84     this.helpPoint1.x -= matrix.tx;
 85     this.helpPoint1.y -= matrix.ty;
 86 
 87     this.helpPoint2.x = 1;
 88     this.helpPoint2.y = 0;
 89     this.helpPoint2 = cc.PointApplyAffineTransform(this.helpPoint2, matrix);
 90     this.helpPoint2.x -= matrix.tx;
 91     this.helpPoint2.y -= matrix.ty;
 92 
 93     node.skewX = -(Math.atan2(this.helpPoint1.y, this.helpPoint1.x) - 1.5707964); //todo
 94     //node.skewX = -Math.atan2(this.helpPoint2.y, this.helpPoint2.x);
 95     node.skewY = Math.atan2(this.helpPoint2.y, this.helpPoint2.x);
 96     node.scaleX = Math.sqrt(matrix.a * matrix.a + matrix.b * matrix.b);
 97     node.scaleY = Math.sqrt(matrix.c * matrix.c + matrix.d * matrix.d);
 98     node.x = matrix.tx;
 99     node.y = matrix.ty;
100 };
101 
102 /**
103  * @function
104  * @param {ccs.BaseData} target
105  * @param {ccs.BaseData} source
106  */
107 ccs.TransformHelp.nodeConcat = function (target, source) {
108     target.x += source.x;
109     target.y += source.y;
110     target.skewX += source.skewX;
111     target.skewY += source.skewY;
112     target.scaleX += source.scaleX;
113     target.scaleY += source.scaleY;
114 };
115 
116 /**
117  * @function
118  * @param {ccs.BaseData} target
119  * @param {ccs.BaseData} source
120  */
121 ccs.TransformHelp.nodeSub = function (target, source) {
122     target.x -= source.x;
123     target.y -= source.y;
124     target.skewX -= source.skewX;
125     target.skewY -= source.skewY;
126     target.scaleX -= source.scaleX;
127     target.scaleY -= source.scaleY;
128 };