public static void Rectangle(this Graphics2D gx, RectInt rect, ColorRGBA color)
 {
     gx.Rectangle(rect.Left, rect.Bottom, rect.Right, rect.Top, color);
 }
 public static void Rectangle(this Graphics2D gx, RectD rect, ColorRGBA color, double strokeWidth = 1)
 {
     gx.Rectangle(rect.Left, rect.Bottom, rect.Right, rect.Top, color, strokeWidth);
 }