public void AddOverlay(OverlayDrawing overlay)
{
RemoveOverlay(overlay.ID);
_overlays.TryAdd(overlay.ID, overlay);
_isDirty = true;
}
private void Draw(OverlayDrawing drawing)
{
if (drawing is EllipseOverlay)
{
DrawEllipse(drawing as EllipseOverlay);
}
else if (drawing is RectangleOverlay)
{
DrawRectangle(drawing as RectangleOverlay);
}
else if (drawing is PolygonOverlay)
{
DrawPolygon(drawing as PolygonOverlay);
}
}
protected void DrawOverlay(OverlayDrawing overlay)
{
_viewModel.AddOverlay(overlay);
}
