_CrossingByPosition
BReference<Crossing> newLeftTop = _CrossingByPosition(fLeftTopCrossing,
BReference<Crossing> newRightTop = _CrossingByPosition(fRightTopCrossing,
BReference<Crossing> newLeftBottom = _CrossingByPosition(
BReference<Crossing> newRightBottom = _CrossingByPosition(
BReference<Crossing> _CrossingByPosition(Crossing* crossing,