/// <summary>
/// Replaces the already visible zone or creates a new one.
/// </summary>
/// <param name="z">The z coordinate.</param>
/// <param name="replace">The z coordinate.</param>
void CreateZone (Zone z, Polygon replace = null)
{
IList<LatLng> points = new List<LatLng>(z.Points.Count);
if (replace != null) {
// Replace the points from the old polygon
foreach (var zp in z.Points) {
points.Add(new LatLng(zp.Latitude, zp.Longitude));
replace.Points = points;
}
} else {
// Create a new polygon for zone
PolygonOptions po = new PolygonOptions ();
foreach (var zp in z.Points) {
po.Points.Add (new LatLng (zp.Latitude, zp.Longitude));
}
po.InvokeStrokeColor (Color.Argb (160, 255, 0, 0));
po.InvokeStrokeWidth (2);
po.InvokeFillColor (Color.Argb (80, 255, 0, 0));
po.InvokeZIndex(1);
// Add polygon to list of active zones
zones.Add (z.ObjIndex, _map.AddPolygon (po));
}
}