/// <summary>
/// Push skew (shear) transformation to matrix. The skewing origin is assumed at (0, 0)
/// </summary>
/// <param name="angleX">X-axis skew angle (in degree)</param>
/// <param name="angleY">Y-axis skew angle (in degree)</param>
public void Skew(double angleX, double angleY)
{
if (currentTransform == null)
{
currentTransform = new Matrix3x3();
}
transformRequired = true;
currentTransform.Skew(angleX, angleY);
}
/// <summary>
/// Apply current transformation for (centerX, centerY) then skew at center point
/// </summary>
/// <param name="xSkewAngle">x skew angle (in degree)</param>
/// <param name="ySkewAngle">y skew angle (in degree)</param>
/// <param name="centerX">center point x coordinate</param>
/// <param name="centerY">center point y coordinate</param>
public void SkewPrepend(double xSkewAngle, double ySkewAngle, double centerX, double centerY)
{
if ((xSkewAngle != 0) || (ySkewAngle != 0))
{
Matrix3x3 matrix = new Matrix3x3();
matrix.Translate(-centerX, -centerY);
matrix.Skew(xSkewAngle, ySkewAngle);
matrix.Translate(centerX, centerY);
// then prepend multiply
this.PrependSelfMultiply(matrix.Sx, matrix.Sy, matrix.Shx, matrix.Shy, matrix.Tx, matrix.Ty);
//PrependSelfMultiply(1.0, 1.0,
// Math.Tan(xSkewAngle * DegreeToRadianFactor),
// Math.Tan(ySkewAngle * DegreeToRadianFactor),
// centerX, centerY);
isChanged = true;
SimpleScaleAndTranslateOnly = false;
ScaleAndTransformOnly = false;
}
}
/// <summary>
/// Apply current transformation for (centerX, centerY) then skew at center point
/// </summary>
/// <param name="xSkewAngle">x skew angle (in degree)</param>
/// <param name="ySkewAngle">y skew angle (in degree)</param>
/// <param name="centerX">center point x coordinate</param>
/// <param name="centerY">center point y coordinate</param>
public void SkewPrepend(double xSkewAngle, double ySkewAngle, double centerX, double centerY)
{
if ((xSkewAngle != 0) || (ySkewAngle != 0))
{
Matrix3x3 matrix = new Matrix3x3();
matrix.Translate(-centerX, -centerY);
matrix.Skew(xSkewAngle, ySkewAngle);
matrix.Translate(centerX, centerY);
// then prepend multiply
this.PrependSelfMultiply(matrix.Sx, matrix.Sy, matrix.Shx, matrix.Shy, matrix.Tx, matrix.Ty);
//PrependSelfMultiply(1.0, 1.0,
// Math.Tan(xSkewAngle * DegreeToRadianFactor),
// Math.Tan(ySkewAngle * DegreeToRadianFactor),
// centerX, centerY);
isChanged = true;
SimpleScaleAndTranslateOnly = false;
ScaleAndTransformOnly = false;
}
}