Examples of org.geotools.geometry.iso.topograph2D.Label

Package org.geotools.geometry.iso.topograph2D

Examples of org.geotools.geometry.iso.topograph2D.Label

org.geotools.geometry.iso.topograph2D.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. @source $URL$ @version 1.7.2

   * and in the interior of areas.
   */
  private void labelIsolatedNodes() {
    for (Iterator ni = nodes.iterator(); ni.hasNext();) {
      Node n = (Node) ni.next();
      Label label = n.getLabel();
      // isolated nodes should always have at least one geometry in their
      // label
      Assert.isTrue(label.getGeometryCount() > 0,
          "node with empty label found");
      if (n.isIsolated()) {
        if (label.isNull(0))
          labelIsolatedNode(n, 0);
        else
          labelIsolatedNode(n, 1);
      }
    }

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    Coordinate pPrev = edge.getCoordinate(iPrev);
    // if prev intersection is past the previous vertex, use it instead
    if (eiPrev != null && eiPrev.segmentIndex >= iPrev)
      pPrev = eiPrev.coord;


    Label label = new Label(edge.getLabel());
    // since edgeStub is oriented opposite to it's parent edge, have to flip
    // sides for edge label
    label.flip();
    EdgeEnd e = new EdgeEnd(edge, eiCurr.coord, pPrev, label);
    // e.print(System.out); System.out.println();
    l.add(e);
  }

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    // if the next intersection is in the same segment as the current, use
    // it as the endpoint
    if (eiNext != null && eiNext.segmentIndex == eiCurr.segmentIndex)
      pNext = eiNext.coord;


    EdgeEnd e = new EdgeEnd(edge, eiCurr.coord, pNext, new Label(edge
        .getLabel()));
    // Debug.println(e);
    l.add(e);
  }

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  private List edgeEnds = new ArrayList();


  public EdgeEndBundle(EdgeEnd e) {
    super(e.getEdge(), e.getCoordinate(), e.getDirectedCoordinate(),
        new Label(e.getLabel()));
    insert(e);
  }

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      EdgeEnd e = (EdgeEnd) it.next();
      if (e.getLabel().isArea())
        isArea = true;
    }
    if (isArea)
      label = new Label(Location.NONE, Location.NONE, Location.NONE);
    else
      label = new Label(Location.NONE);


    // compute the On label, and the side labels if present
    for (int i = 0; i < 2; i++) {
      computeLabelOn(i);
      if (isArea)

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Related Classes of org.geotools.geometry.iso.topograph2D.Label

org.geotools.geometry.iso.operation.overlay.LineBuilder

org.geotools.geometry.iso.operation.overlay.OverlayOp

org.geotools.geometry.iso.operation.overlay.PointBuilder

org.geotools.geometry.iso.operation.relate.EdgeEndBuilder

org.geotools.geometry.iso.operation.relate.EdgeEndBundle

org.geotools.geometry.iso.operation.relate.RelateComputer

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