public static void FillRectangle(this Graphics2D gx, Vector2 leftBottom,
Vector2 rightTop, ColorRGBA fillColor)
{
gx.FillRectangle(leftBottom.x, leftBottom.y, rightTop.x, rightTop.y, fillColor);
}
public static void FillRectangle(this Graphics2D gx, RectInt rect, ColorRGBA fillColor)
{
gx.FillRectangle(rect.Left, rect.Bottom, rect.Right, rect.Top, fillColor);
}