axmol/extensions/CCArmature/utils/CCTransformHelp.cpp

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#include "CCTransformHelp.h"
#include "CCUtilMath.h"

namespace cocos2d { namespace extension { namespace armature {

CCAffineTransform CCTransformHelp::helpMatrix1;
CCAffineTransform CCTransformHelp::helpMatrix2;

CCPoint CCTransformHelp::helpPoint1;
CCPoint CCTransformHelp::helpPoint2;

CCBaseData helpParentNode;

CCTransformHelp::CCTransformHelp()
{
}

void CCTransformHelp::transformFromParent(CCBaseData &node, const CCBaseData &parentNode)
{
    nodeToMatrix(node, helpMatrix1);
    nodeToMatrix(parentNode, helpMatrix2);

    helpMatrix2 = CCAffineTransformInvert(helpMatrix2);
    helpMatrix1 = CCAffineTransformConcat(helpMatrix1, helpMatrix2);

    matrixToNode(helpMatrix1, node);
}

void CCTransformHelp::transformToParent(CCBaseData &node, const CCBaseData &parentNode)
{

    nodeToMatrix(node, helpMatrix1);
    nodeToMatrix(parentNode, helpMatrix2);

    helpMatrix1 = CCAffineTransformConcat(helpMatrix1, helpMatrix2);

    matrixToNode(helpMatrix1, node);
}

void CCTransformHelp::transformFromParentWithoutScale(CCBaseData &node, const CCBaseData &parentNode)
{

    helpParentNode.copy(&parentNode);
    helpParentNode.scaleX = 1;
    helpParentNode.scaleY = 1;

    nodeToMatrix(node, helpMatrix1);
    nodeToMatrix(helpParentNode, helpMatrix2);

    helpMatrix2 = CCAffineTransformInvert(helpMatrix2);
    helpMatrix1 = CCAffineTransformConcat(helpMatrix1, helpMatrix2);

    matrixToNode(helpMatrix1, node);
}

void CCTransformHelp::transformToParentWithoutScale(CCBaseData &node, const CCBaseData &parentNode)
{

    helpParentNode.copy(&parentNode);
    helpParentNode.scaleX = 1;
    helpParentNode.scaleY = 1;

    nodeToMatrix(node, helpMatrix1);
    nodeToMatrix(helpParentNode, helpMatrix2);

    helpMatrix1 = CCAffineTransformConcat(helpMatrix1, helpMatrix2);

    matrixToNode(helpMatrix1, node);
}

void CCTransformHelp::nodeToMatrix(const CCBaseData &node, CCAffineTransform &matrix)
{
    matrix.a = node.scaleX * cos(node.skewY);
    matrix.b = node.scaleX * sin(node.skewY);
    matrix.c = node.scaleY * sin(node.skewX);
    matrix.d = node.scaleY * cos(node.skewX);

    matrix.tx = node.x;
    matrix.ty = node.y;
}

void CCTransformHelp::matrixToNode(const CCAffineTransform &matrix, CCBaseData &node)
{
    /*
     *  In as3 language, there is a function called "deltaTransformPoint", it calculate a point used give Transform
     *  but not used the tx, ty value. we simulate the function here
     */
    helpPoint1.x = 0;
    helpPoint1.y = 1;
    helpPoint1 = CCPointApplyAffineTransform(helpPoint1, matrix);
    helpPoint1.x -= matrix.tx;
    helpPoint1.y -= matrix.ty;

    helpPoint2.x = 1;
    helpPoint2.y = 0;
    helpPoint2 = CCPointApplyAffineTransform(helpPoint2, matrix);
    helpPoint2.x -= matrix.tx;
    helpPoint2.y -= matrix.ty;

    node.skewX = -(atan2f(helpPoint1.y, helpPoint1.x) - 1.5707964f);
    node.skewY = atan2f(helpPoint2.y, helpPoint2.x);
    node.scaleX = sqrt(matrix.a * matrix.a + matrix.b * matrix.b);
    node.scaleY = sqrt(matrix.c * matrix.c + matrix.d * matrix.d);
    node.x = matrix.tx;
    node.y = matrix.ty;
}

void CCTransformHelp::nodeConcat(CCBaseData &target, CCBaseData &source)
{
    target.x += source.x;
    target.y += source.y;
    target.skewX += source.skewX;
    target.skewY += source.skewY;
    target.scaleX += source.scaleX;
    target.scaleY += source.scaleY;
}

}}} // namespace cocos2d { namespace extension { namespace armature {