protected override void OnRender(IDrawingContext context, Rect bounds, double opacity)
{
base.OnRender(context, bounds, opacity);
Polygon polygon = WpfElement as Polygon;
if (polygon.Points != null)
{
DrawingStyle style = DrawingStyle.FromElement(this);
style.Fill = polygon.Fill;
style.Stroke = polygon.Stroke;
style.StrokeThickness = new Thickness(polygon.StrokeThickness);
style.Opacity = opacity;
context.DrawPolygon(bounds, polygon.Points.ToArray(), style);
}
}