- c.line(start_down_right_left_x, half_height, x_right_SPINE_LIMIT, end_point_down_right_y)
- c.line(x_right_SPINE_LIMIT, end_point_down_right_y, x_right_SPINE_LIMIT, middle_point_down_right_y)
- c.line(x_right_SPINE_LIMIT, middle_point_down_right_y, start_down_right_right_x, half_height)
+ c.line(start_down_right_left_x, half_height, x_right_spine_limit, end_point_down_right_y)
+ c.line(x_right_spine_limit, end_point_down_right_y, x_right_spine_limit, middle_point_down_right_y)
+ c.line(x_right_spine_limit, middle_point_down_right_y, start_down_right_right_x, half_height)