- // image->draw_line(thickness, r, g, b,
- // int(_body_xc) - delta, int(_body_yc),
- // int(_body_xc) + delta, int(_body_yc));
-
- // image->draw_line(thickness, r, g, b,
- // int(_body_xc), int(_body_yc) - delta,
- // int(_body_xc), int(_body_yc) + delta);
-
- scalar_t vx = _body_xc - _head_xc, vy = _body_yc - _head_yc;