Computes the crossing matrix between the unfixedLayer and its adjacent layers. The direction argument indicates which adjacent layers should be taken into consideration when computing the crossing matrix: direction == 0 -- use unfixedLayer - 1 and unfixedLayer + 1 direction > 0 -- use unfixedLayer - 1 (sweeping away from layer 0) direction < 0 -- use unfixedLayer + 1 (sweeping towards layer 0) The resulting integer array can be used as follows: if index1 and index2 are the indices corresponding to two nodes on the unfixedLayer and crossmat is the crossing matrix, then crossmat[index1 * indices[unfixedLayer] + index2] is the number of crossing that occur if the node corresponding to index1 is placed to the left of the node corresponding to index2. If index1 == index2, then crossmat[index1 * indices[unfixedLayer] + index2] is the number of crossings between links to and from the node corresponding to index1.

protected virtual int[] CrossingMatrix( 
   int unfixedLayer,
   int direction
)