wxGraphicsPath path = gc->CreatePath ();
path.MoveToPoint (time_x (start), y_pos (_track) + 4);
path.AddLineToPoint (time_x (start + len), y_pos (_track) + 4);
wxGraphicsPath path = gc->CreatePath ();
path.MoveToPoint (time_x (start), y_pos (_track) + 4);
path.AddLineToPoint (time_x (start + len), y_pos (_track) + 4);