/// <summary>
 /// Transform a rectangle with all matrices.
 /// </summary>
 /// <param name="r"></param>
 public CGRect RectValueToPixel(CGRect r)
 {
     return(ValueToPixelMatrix.TransformRect(r));
 }
 public CGPoint PointValueToPixel(float x, float y)
 {
     return(ValueToPixelMatrix.TransformPoint(new CGPoint(x, y)));
 }