public static IDisposable RotateTransform(this XGraphics gfx, Elements.Element element, XElement context, IXmlNamespaceResolver resolver)
{
//rotation = Math.PI * 2 * rotation / 360.0;
var state = gfx.SaveState();
var rotation = element.Rotation.GetValue(context, resolver);
var origin = element.RotationOrigin.GetValue(context, resolver);
var frame = element.Position.GetValue(context, resolver);
origin = new XPoint(origin.X * frame.Width + frame.X, origin.Y * frame.Height + frame.Y);
gfx.RotateAtTransform(rotation, origin);
return(state);
}