- if (!item_l_drul_[LEFT]
- || !item_l_drul_[RIGHT])
- return ;
-
- Direction d = LEFT;
- do {
- Paper_column * pc = item_l_drul_[d]->get_column ();
- distance_ += - d * item_l_drul_[d]->relative_coordinate (pc, X_AXIS);
- item_l_drul_[d] = pc;
- } while ((flip (&d))!=LEFT);