Examples of com.vividsolutions.jts.geomgraph.Label

Package com.vividsolutions.jts.geomgraph

Examples of com.vividsolutions.jts.geomgraph.Label

com.vividsolutions.jts.geomgraph.Label
A Label indicates the topological relationship of a component of a topology graph to a given Geometry. This class supports labels for relationships to two Geometrys, which is sufficient for algorithms for binary operations.
Topology graphs support the concept of labeling nodes and edges in the graph. The label of a node or edge specifies its topological relationship to one or more geometries. (In fact, since JTS operations have only two arguments labels are required for only two geometries). A label for a node or edge has one or two elements, depending on whether the node or edge occurs in one or both of the input Geometrys. Elements contain attributes which categorize the topological location of the node or edge relative to the parent Geometry; that is, whether the node or edge is in the interior, boundary or exterior of the Geometry. Attributes have a value from the set {Interior, Boundary, Exterior}. In a node each element has a single attribute <On>. For an edge each element has a triplet of attributes <Left, On, Right>.
It is up to the client code to associate the 0 and 1 TopologyLocations with specific geometries. @version 1.7


  public Node(Coordinate coord, EdgeEndStar edges)
  {
    this.coord = coord;
    this.edges = edges;
    label = new Label(0, Location.NONE);
  }

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  }


  public void setLabel(int argIndex, int onLocation)
  {
    if (label == null) {
      label = new Label(argIndex, onLocation);
    }
    else
      label.setLocation(argIndex, onLocation);
  }

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   * @param rightLoc
   * @return new instance of SplitEdge
   */
    public static SplitEdge newInstance(final Coordinate firstCoord, final Coordinate secondCoord, final int onLoc, final int leftLoc, final int rightLoc ) {


        final Label label = new Label(onLoc, leftLoc, rightLoc);


        Coordinate[] edgeCoord = new Coordinate[2];
        edgeCoord[0] = firstCoord;
        edgeCoord[1] = secondCoord;

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     * @param leftLoc
     * @param rightLoc
     * @return new instance of SplitEdge
     */
    public static SplitEdge newInstance( Coordinate[] coords, int onLoc, int leftLoc, int rightLoc ) {
        Label label = new Label(onLoc, leftLoc, rightLoc);
        SplitEdge splitEdge = new SplitEdge(coords, label);
        
        return splitEdge;
    }

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   * @return The locations of the labels.
   */
  private int[] getLabelLocations() {


    int[] locations = new int[3];
    Label label = getLabel();
    locations[Position.ON] = label.getLocation(0, Position.ON);
    locations[Position.LEFT] = label.getLocation(0, Position.LEFT);
    locations[Position.RIGHT] = label.getLocation(0, Position.RIGHT);
    return locations;
  }

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  public Node(Coordinate coord, EdgeEndStar edges)
  {
    this.coord = coord;
    this.edges = edges;
    label = new Label(0, Location.NONE);
  }

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  }


  public void setLabel(int argIndex, int onLocation)
  {
    if (label == null) {
      label = new Label(argIndex, onLocation);
    }
    else
      label.setLocation(argIndex, onLocation);
  }

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Related Classes of com.vividsolutions.jts.geomgraph.Label

com.vividsolutions.jts.geomgraph.Node

org.locationtech.udig.tools.geometry.split.SplitEdge

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