public VoronoiEdgePathNode( VoronoiCellVertex v )
 {
   nodeType = VoronoiEdgePathNodeType.VERTEX;
   vertex = v;
 }
 public VoronoiEdgePathNode(VoronoiCellVertex v)
 {
     nodeType = VoronoiEdgePathNodeType.VERTEX;
     vertex   = v;
 }
 public VoronoiEdgePathNode( VoronoiCellEdge e )
 {
   nodeType = VoronoiEdgePathNodeType.EDGE;
   edge = e;
 }
 public VoronoiEdgePathNode(VoronoiCellEdge e)
 {
     nodeType = VoronoiEdgePathNodeType.EDGE;
     edge     = e;
 }