Reorders nodes within the unfixedLayer to reduce the number of link crossings between the unfixedLayer and its adjacent layers. The direction argument indicates which of the adjacent layers should be taken into consideration when reducing the number of crossings. direction == 0 -- use unfixedLayer - 1 and unfixedLayer + 1 direction > 0 -- use unfixedLayer - 1 (sweeping away from layer 0) direction < 0 -- use unfixedLayer + 1 (sweepeing towards layer 0) The idea is to calculate the median and barycenter for each node in the unfixedLayer, and to sort the nodes in the unfixedLayer by their median and barycenter values. Returns true if some change was made to the layer.

protected virtual bool MedianBarycenterCrossingReduction( 
   int unfixedLayer,
   int direction
)