LogViewer.MainWindow.MapLocation C# (CSharp) Method

        private void MapLocation(double latitude, double longitude)
        {
            if (Math.Round(lastLat, 5) == Math.Round(latitude) && Math.Round(lastLon, 5) == Math.Round(longitude, 5))
            {
                // hasn't moved far enough yet...
                return;
            }
            lastLat = latitude;
            lastLon = longitude;
            bool first = false;
            if (currentFlight == null)
            {
                first = true;
                currentFlight = new MapPolyline();
                currentFlight.StrokeThickness = 4;
                currentFlight.Stroke = new SolidColorBrush(Colors.Magenta);
                currentFlight.Locations = new LocationCollection();
                myMap.Children.Add(currentFlight);
            }
            currentFlight.Locations.Add(new Location() { Latitude = latitude, Longitude = longitude });
            // make sure it's on top.
            if (myMap.Children.IndexOf(currentFlight) < 0)
            {
                myMap.Children.Add(currentFlight);
            }
            else if (myMap.Children.IndexOf(currentFlight) != myMap.Children.Count - 1)
            {
                myMap.Children.Remove(currentFlight);
                myMap.Children.Add(currentFlight);
            }
            if (currentFlight.Locations.Count > 1000)
            {
                // remove the older points.
                currentFlight.Locations.RemoveAt(0);
            }
            if (first && myMap.Visibility == Visibility.Visible)
            {
                myMap.SetView(currentFlight.Locations, new Thickness(20.0), 0);
            }
        }