//overlays
/// <summary>Add a new overlay to MapViewer</summary>
/// <param name="overlay"></param>
public void AddOverlay(MapOverlay overlay)
{
if (!IsMapLoaded)
{
throw new InvalidOperationException("Must load a map before placing overlays");
}
overlay.Map = this;
//insert in the correct layer
//at top by default
var layer = -1;
//find the layer if not default
if (overlay.Layer < int.MaxValue)
{
layer = overlays.FindIndex(o => o.Layer > overlay.Layer);
}
if (layer >= 0)
{
overlaysCanvas.Children.Insert(layer, overlay);
overlays.Insert(layer, overlay);
}
else
{
overlaysCanvas.Children.Add(overlay);
overlays.Add(overlay);
}
}
/// <summary>Remove an overlay from MapViewer</summary>
/// <param name="overlay"></param>
public void RemoveOverlay(MapOverlay overlay)
{
overlays.Remove(overlay);
overlaysCanvas.Children.Remove(overlay);
overlay.Map = null;
}