- path.MoveToPoint (time_x (position), y_pos (_track) + 4);
- path.AddLineToPoint (time_x (position + len), y_pos (_track) + 4);
- path.AddLineToPoint (time_x (position + len), y_pos (_track + 1) - 4);
- path.AddLineToPoint (time_x (position), y_pos (_track + 1) - 4);
- path.AddLineToPoint (time_x (position), y_pos (_track) + 4);
+ path.MoveToPoint (time_x (position), y_pos (_track.get()) + 4);
+ path.AddLineToPoint (time_x (position + len), y_pos (_track.get()) + 4);
+ path.AddLineToPoint (time_x (position + len), y_pos (_track.get() + 1) - 4);
+ path.AddLineToPoint (time_x (position), y_pos (_track.get() + 1) - 4);
+ path.AddLineToPoint (time_x (position), y_pos (_track.get()) + 4);