public void InsertCoordinate(int index, CLLocationCoordinate2D coord)
{
var indexOverlay = GetOverlayIndex(ZIndex);
if (_polylines.Count == 0)
{
// no position yet
var polyline = MKPolyline.FromCoordinates(new[] { coord });
_map.InsertOverlay(polyline, indexOverlay);
_polylines.Add(polyline);
}
else
{
// find the polyline to extend with the new coordinate
// add position to the las polyline
var polyline = _polylines.Last();
_map.RemoveOverlay(polyline);
_polylines.Remove(polyline);
var points = new List <CLLocationCoordinate2D>(polyline.GetCoordinates(0, (int)polyline.PointCount));
points.Add(coord);
polyline = MKPolyline.FromCoordinates(points.ToArray());
_polylines.Add(polyline);
_map.InsertOverlay(polyline, indexOverlay);
if (polyline.PointCount == PolylineSegmentLength + 1)
{
// Polyline is full
var nextPolyline = MKPolyline.FromCoordinates(new[] { coord });
_map.InsertOverlay(nextPolyline, indexOverlay);
_polylines.Add(nextPolyline);
}
}
}