- dxy[X_AXIS] = bound[RIGHT]->extent (common[X_AXIS], X_AXIS)[LEFT]
- - bound[LEFT]->extent (common[X_AXIS], X_AXIS)[RIGHT];
+ Real off = gap + ((bound[LEFT]->extent (bound[LEFT], X_AXIS).length ()*3)/4); // distance from center to start of line
+ dxy[X_AXIS] = bound[RIGHT]->extent (common[X_AXIS], X_AXIS).center ()
+ - bound[LEFT]->extent (common[X_AXIS], X_AXIS).center ();