MissionPlanner.GMapMarkerSingle.OnRender C# (CSharp) Method

        public override void OnRender(Graphics g)
        {
            Matrix temp = g.Transform;
            g.TranslateTransform(LocalPosition.X, LocalPosition.Y);

            int length = 500;
            // anti NaN
            try
            {
                g.DrawLine(new Pen(Color.Red, 2), 0.0f, 0.0f, (float)Math.Cos((heading - 90) * deg2rad) * length,
                    (float)Math.Sin((heading - 90) * deg2rad) * length);
            }
            catch
            {
            }
            //g.DrawLine(new Pen(Color.Green, 2), 0.0f, 0.0f, (float)Math.Cos((nav_bearing - 90) * deg2rad) * length, (float)Math.Sin((nav_bearing - 90) * deg2rad) * length);
            g.DrawLine(new Pen(Color.Black, 2), 0.0f, 0.0f, (float)Math.Cos((cog - 90) * deg2rad) * length,
                (float)Math.Sin((cog - 90) * deg2rad) * length);
            g.DrawLine(new Pen(Color.Orange, 2), 0.0f, 0.0f, (float)Math.Cos((target - 90) * deg2rad) * length,
                (float)Math.Sin((target - 90) * deg2rad) * length);
            // anti NaN
            try
            {
                g.RotateTransform(heading);
            }
            catch
            {
            }

            g.DrawImageUnscaled(icon, icon.Width / -2 + 2, icon.Height / -2);

            g.DrawString(sysid.ToString(), new Font(FontFamily.GenericMonospace, 15, FontStyle.Bold), Brushes.Red, -8,
                -8);

            g.Transform = temp;
        }
    }