Class BoundaryChainNoder

  • All Implemented Interfaces:
    Noder

    public class BoundaryChainNoder
    extends java.lang.Object
    implements Noder
    A noder which extracts chains of boundary segments as SegmentStrings from a polygonal coverage. Boundary segments are those which are not duplicated in the input polygonal coverage. Extracting chains of segments minimize the number of segment strings created, which produces a more efficient topological graph structure.

    This enables fast overlay of polygonal coverages in CoverageUnion. Using this noder is faster than SegmentExtractingNoder and BoundarySegmentNoder.

    No precision reduction is carried out. If that is required, another noder must be used (such as a snap-rounding noder), or the input must be precision-reduced beforehand.

    Author:
    Martin Davis
    • Constructor Summary

      Constructors 
      Constructor Description
      BoundaryChainNoder()
      Creates a new boundary-extracting noder.
    • Constructor Detail

      • BoundaryChainNoder

        public BoundaryChainNoder()
        Creates a new boundary-extracting noder.
    • Method Detail

      • computeNodes

        public void computeNodes​(java.util.Collection segStrings)
        Description copied from interface: Noder
        Computes the noding for a collection of SegmentStrings. Some Noders may add all these nodes to the input SegmentStrings; others may only add some or none at all.
        Specified by:
        computeNodes in interface Noder
        Parameters:
        segStrings - a collection of SegmentStrings to node
      • getNodedSubstrings

        public java.util.Collection getNodedSubstrings()
        Description copied from interface: Noder
        Returns a Collection of fully noded SegmentStrings. The SegmentStrings have the same context as their parent.
        Specified by:
        getNodedSubstrings in interface Noder
        Returns:
        a Collection of SegmentStrings