Class SnapRoundingIntersectionAdder

java.lang.Object
org.locationtech.jts.noding.snapround.SnapRoundingIntersectionAdder
All Implemented Interfaces:
SegmentIntersector

public class SnapRoundingIntersectionAdder extends Object implements SegmentIntersector
Finds intersections between line segments which will be snap-rounded, and adds them as nodes to the segments.

Intersections are detected and computed using full precision. Snapping takes place in a subsequent phase.

The intersection points are recorded, so that HotPixels can be created for them.

To avoid robustness issues with vertices which lie very close to line segments a heuristic is used: nodes are created if a vertex lies within a tolerance distance of the interior of a segment. The tolerance distance is chosen to be significantly below the snap-rounding grid size. This has empirically proven to eliminate noding failures.

Version:
1.17
  • Constructor Details

    • SnapRoundingIntersectionAdder

      public SnapRoundingIntersectionAdder(double nearnessTol)
      Creates an intersector which finds all snapped interior intersections, and adds them as nodes.
      Parameters:
      nearnessTol - the intersection distance tolerance
  • Method Details

    • getIntersections

      public List<Coordinate> getIntersections()
      Gets the created intersection nodes, so they can be processed as hot pixels.
      Returns:
      a list of the intersection points
    • processIntersections

      public void processIntersections(SegmentString e0, int segIndex0, SegmentString e1, int segIndex1)
      This method is called by clients of the SegmentIntersector class to process intersections for two segments of the SegmentStrings being intersected. Note that some clients (such as MonotoneChains) may optimize away this call for segment pairs which they have determined do not intersect (e.g. by an disjoint envelope test).
      Specified by:
      processIntersections in interface SegmentIntersector
    • isDone

      public boolean isDone()
      Always process all intersections
      Specified by:
      isDone in interface SegmentIntersector
      Returns:
      false always