MissionPlanner.GMapMarkerRect.OnRender C# (CSharp) Method

        public override void OnRender(Graphics g)
        {
            base.OnRender(g);

            if (wprad == 0 || Overlay.Control == null)
                return;

            // if we have drawn it, then keep that color
            if (!initcolor.HasValue)
                Color = Color.White;

            // undo autochange in mouse over
            //if (Pen.Color == Color.Blue)
            //  Pen.Color = Color.White;

            double width =
                (Overlay.Control.MapProvider.Projection.GetDistance(Overlay.Control.FromLocalToLatLng(0, 0),
                    Overlay.Control.FromLocalToLatLng(Overlay.Control.Width, 0))*1000.0);
            double height =
                (Overlay.Control.MapProvider.Projection.GetDistance(Overlay.Control.FromLocalToLatLng(0, 0),
                    Overlay.Control.FromLocalToLatLng(Overlay.Control.Height, 0))*1000.0);
            double m2pixelwidth = Overlay.Control.Width/width;
            double m2pixelheight = Overlay.Control.Height/height;

            GPoint loc = new GPoint((int) (LocalPosition.X - (m2pixelwidth*wprad*2)), LocalPosition.Y);
                // MainMap.FromLatLngToLocal(wpradposition);

            if (m2pixelheight > 0.5 && !double.IsInfinity(m2pixelheight))
                g.DrawArc(Pen,
                    new System.Drawing.Rectangle(
                        LocalPosition.X - Offset.X - (int) (Math.Abs(loc.X - LocalPosition.X)/2),
                        LocalPosition.Y - Offset.Y - (int) Math.Abs(loc.X - LocalPosition.X)/2,
                        (int) Math.Abs(loc.X - LocalPosition.X), (int) Math.Abs(loc.X - LocalPosition.X)), 0, 360);
        }
    }