protected override void OnRenderCore(DrawingContext dc, RenderState state)
{
if (DataSource == null) return;
if (Marker == null) return;
Rect bounds = Rect.Empty;
using (IPointEnumerator enumerator = DataSource.GetEnumerator(GetContext()))
{
Point point = new Point();
while (enumerator.MoveNext())
{
enumerator.GetCurrent(ref point);
enumerator.ApplyMappings(Marker);
Point screenPoint = point.Transform(state.Visible, state.Output);
bounds = Rect.Union(bounds, point);
Marker.Render(dc, screenPoint);
}
}
ContentBounds = bounds;
}