axmol/extensions/cocostudio/TransformHelp.cpp

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Copyright (c) 2013-2017 Chukong Technologies Inc.

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#include "TransformHelp.h"

USING_NS_AX;

namespace cocostudio
{

AffineTransform TransformHelp::helpMatrix1;
AffineTransform TransformHelp::helpMatrix2;

Vec2 TransformHelp::helpPoint1;
Vec2 TransformHelp::helpPoint2;

BaseData helpParentNode;

TransformHelp::TransformHelp() {}

void TransformHelp::transformFromParent(BaseData& node, const BaseData& parentNode)
{
    nodeToMatrix(node, helpMatrix1);
    nodeToMatrix(parentNode, helpMatrix2);

    helpMatrix2 = AffineTransformInvert(helpMatrix2);
    helpMatrix1 = AffineTransformConcat(helpMatrix1, helpMatrix2);

    matrixToNode(helpMatrix1, node);
}

void TransformHelp::transformToParent(BaseData& node, const BaseData& parentNode)
{

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

    helpMatrix1 = AffineTransformConcat(helpMatrix1, helpMatrix2);

    matrixToNode(helpMatrix1, node);
}

void TransformHelp::transformFromParentWithoutScale(BaseData& node, const BaseData& parentNode)
{

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

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

    helpMatrix2 = AffineTransformInvert(helpMatrix2);
    helpMatrix1 = AffineTransformConcat(helpMatrix1, helpMatrix2);

    matrixToNode(helpMatrix1, node);
}

void TransformHelp::transformToParentWithoutScale(BaseData& node, const BaseData& parentNode)
{

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

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

    helpMatrix1 = AffineTransformConcat(helpMatrix1, helpMatrix2);

    matrixToNode(helpMatrix1, node);
}

void TransformHelp::nodeToMatrix(const BaseData& node, AffineTransform& matrix)
{
    if (node.skewX == -node.skewY)
    {
        double sine   = sin(node.skewX);
        double cosine = cos(node.skewX);

        matrix.a = node.scaleX * cosine;
        matrix.b = node.scaleX * -sine;
        matrix.c = node.scaleY * sine;
        matrix.d = node.scaleY * cosine;
    }
    else
    {
        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 TransformHelp::nodeToMatrix(const BaseData& node, Mat4& matrix)
{
    matrix = Mat4::IDENTITY;

    if (node.skewX == -node.skewY)
    {
        double sine   = sin(node.skewX);
        double cosine = cos(node.skewX);

        matrix.m[0] = node.scaleX * cosine;
        matrix.m[1] = node.scaleX * -sine;
        matrix.m[4] = node.scaleY * sine;
        matrix.m[5] = node.scaleY * cosine;
    }
    else
    {
        matrix.m[0] = node.scaleX * cos(node.skewY);
        matrix.m[1] = node.scaleX * sin(node.skewY);
        matrix.m[4] = node.scaleY * sin(node.skewX);
        matrix.m[5] = node.scaleY * cos(node.skewX);
    }

    matrix.m[12] = node.x;
    matrix.m[13] = node.y;
}

void TransformHelp::matrixToNode(const AffineTransform& matrix, BaseData& 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   = PointApplyAffineTransform(helpPoint1, matrix);
    helpPoint1.x -= matrix.tx;
    helpPoint1.y -= matrix.ty;

    helpPoint2.x = 1;
    helpPoint2.y = 0;
    helpPoint2   = PointApplyAffineTransform(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 TransformHelp::matrixToNode(const Mat4& matrix, BaseData& 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   = PointApplyTransform(helpPoint1, matrix);
    helpPoint1.x -= matrix.m[12];
    helpPoint1.y -= matrix.m[13];

    helpPoint2.x = 1;
    helpPoint2.y = 0;
    helpPoint2   = PointApplyTransform(helpPoint2, matrix);
    helpPoint2.x -= matrix.m[12];
    helpPoint2.y -= matrix.m[13];

    node.skewX  = -(atan2f(helpPoint1.y, helpPoint1.x) - 1.5707964f);
    node.skewY  = atan2f(helpPoint2.y, helpPoint2.x);
    node.scaleX = sqrt(matrix.m[0] * matrix.m[0] + matrix.m[1] * matrix.m[1]);
    node.scaleY = sqrt(matrix.m[4] * matrix.m[4] + matrix.m[5] * matrix.m[5]);
    node.x      = matrix.m[12];
    node.y      = matrix.m[13];
}

void TransformHelp::nodeConcat(BaseData& target, BaseData& 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;
}

void TransformHelp::nodeSub(BaseData& target, BaseData& 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 cocostudio