internal static XMatrix CreateSkewRadians(double skewX, double skewY, double centerX, double centerY)
{
XMatrix matrix = new XMatrix();
matrix.Append(CreateTranslation(-centerX, -centerY));
matrix.Append(new XMatrix(1, Math.Tan(skewY), Math.Tan(skewX), 1, 0, 0));
matrix.Append(CreateTranslation(centerX, centerY));
return matrix;
}
//public void PushEffect(BitmapEffect effect, BitmapEffectInput effectInput);
//public void PushGuidelineSet(GuidelineSet guidelines);
//public void PushOpacity(double opacity);
//public void PushOpacity(double opacity, AnimationClock opacityAnimations);
//public void PushOpacityMask(Brush opacityMask);
public void PushTransform(MatrixTransform transform)
{
XMatrix matrix = _matrixStack.Peek();
matrix.Append(transform.Matrix);
}