org.locationtech.jts.triangulate.quadedge

Interface TraversalVisitor

public interface TraversalVisitor

Interface for classes which process triangles visited during traversals of a QuadEdgeSubdivision

Author:

Martin Davis

Method Summary

Modifier and Type	Method and Description
boolean	visit(QuadEdgeTriangle currTri, int edgeIndex, QuadEdgeTriangle neighbTri) Visits a triangle during a traversal of a QuadEdgeSubdivision.

Method Detail

visit

boolean visit(QuadEdgeTriangle currTri,
              int edgeIndex,
              QuadEdgeTriangle neighbTri)

Visits a triangle during a traversal of a QuadEdgeSubdivision. An implementation of this method may perform processing on the current triangle. It must also decide whether a neighbouring triangle should be added to the queue so its neighbours are visited. Often it will perform processing on the neighbour triangle as well, in order to mark it as processed (visited) and/or to determine if it should be visited. Note that choosing not to visit the neighbouring triangle is the terminating condition for many traversal algorithms. In particular, if the neighbour triangle has already been visited, it should not be visited again.

Parameters:

currTri - the current triangle being processed

edgeIndex - the index of the edge in the current triangle being traversed

neighbTri - a neighbouring triangle next in line to visit

Returns:

true if the neighbour triangle should be visited