Package org.locationtech.jts.simplify

Class VWSimplifier.VWTransformer

java.lang.Object
org.locationtech.jts.geom.util.GeometryTransformer
org.locationtech.jts.simplify.VWSimplifier.VWTransformer
Enclosing class:
VWSimplifier
static class VWSimplifier.VWTransformer extends GeometryTransformer

  • Field Details

    • isEnsureValidTopology

      private boolean isEnsureValidTopology

    • distanceTolerance

      private double distanceTolerance

  • Constructor Details

    • VWTransformer

      public VWTransformer(boolean isEnsureValidTopology, double distanceTolerance)

  • Method Details

    • transformCoordinates

      protected CoordinateSequence transformCoordinates(CoordinateSequence coords, Geometry parent)
      Description copied from class: GeometryTransformer
      Transforms a CoordinateSequence. This method should always return a valid coordinate list for the desired result type. (E.g. a coordinate list for a LineString must have 0 or at least 2 points). If this is not possible, return an empty sequence - this will be pruned out.
      Overrides:
      transformCoordinates in class GeometryTransformer
      Parameters:
      coords - the coordinates to transform
      parent - the parent geometry
      Returns:
      the transformed coordinates

    • transformPolygon

      protected Geometry transformPolygon(Polygon geom, Geometry parent)
      Simplifies a polygon, fixing it if required.
      Overrides:
      transformPolygon in class GeometryTransformer

    • transformLinearRing

      protected Geometry transformLinearRing(LinearRing geom, Geometry parent)
      Simplifies a LinearRing. If the simplification results in a degenerate ring, remove the component.
      Overrides:
      transformLinearRing in class GeometryTransformer
      Parameters:
      geom - the ring to simplify
      parent - the parent geometry
      Returns:
      null if the simplification results in a degenerate ring

    • transformMultiPolygon

      protected Geometry transformMultiPolygon(MultiPolygon geom, Geometry parent)
      Simplifies a MultiPolygon, fixing it if required.
      Overrides:
      transformMultiPolygon in class GeometryTransformer

    • createValidArea

      private Geometry createValidArea(Geometry rawAreaGeom)
      Creates a valid area geometry from one that possibly has bad topology (i.e. self-intersections). Since buffer can handle invalid topology, but always returns valid geometry, constructing a 0-width buffer "corrects" the topology. Note this only works for area geometries, since buffer always returns areas. This also may return empty geometries, if the input has no actual area.
      Parameters:
      rawAreaGeom - an area geometry possibly containing self-intersections
      Returns:
      a valid area geometry