public void OnMapReady (GoogleMap googleMap)
{
map = googleMap;
var polygonOptions = new PolygonOptions ();
polygonOptions.InvokeFillColor (0x66FF0000);
polygonOptions.InvokeStrokeColor (0x660000FF);
polygonOptions.InvokeStrokeWidth (30.0f);
foreach (var position in shapeCoordinates) {
polygonOptions.Add (new LatLng (position.Latitude, position.Longitude));
}
map.AddPolygon (polygonOptions);
}