Class Edge

java.lang.Object
org.locationtech.jts.planargraph.GraphComponent
org.locationtech.jts.planargraph.Edge
Direct Known Subclasses:
LineMergeEdge
public class Edge extends GraphComponent
Represents an undirected edge of a PlanarGraph. An undirected edge in fact simply acts as a central point of reference for two opposite DirectedEdges.

Usually a client using a PlanarGraph will subclass Edge to add its own application-specific data and methods.

Version:
1.7

  • Field Details

    • dirEdge

      protected DirectedEdge[] dirEdge
      The two DirectedEdges associated with this Edge. Index 0 is forward, 1 is reverse.

  • Constructor Details

    • Edge

      public Edge()
      Constructs an Edge whose DirectedEdges are not yet set. Be sure to call setDirectedEdges(DirectedEdge, DirectedEdge)

    • Edge

      public Edge(DirectedEdge de0, DirectedEdge de1)
      Constructs an Edge initialized with the given DirectedEdges, and for each DirectedEdge: sets the Edge, sets the symmetric DirectedEdge, and adds this Edge to its from-Node.

  • Method Details

    • setDirectedEdges

      public void setDirectedEdges(DirectedEdge de0, DirectedEdge de1)
      Initializes this Edge's two DirectedEdges, and for each DirectedEdge: sets the Edge, sets the symmetric DirectedEdge, and adds this Edge to its from-Node.

    • getDirEdge

      public DirectedEdge getDirEdge(int i)
      Returns one of the DirectedEdges associated with this Edge.
      Parameters:
      i - 0 or 1. 0 returns the forward directed edge, 1 returns the reverse

    • getDirEdge

      public DirectedEdge getDirEdge(Node fromNode)
      Returns the DirectedEdge that starts from the given node, or null if the node is not one of the two nodes associated with this Edge.

    • getOppositeNode

      public Node getOppositeNode(Node node)
      If node is one of the two nodes associated with this Edge, returns the other node; otherwise returns null.

    • isRemoved

      public boolean isRemoved()
      Tests whether this edge has been removed from its containing graph
      Specified by:
      isRemoved in class GraphComponent
      Returns:
      true if this edge is removed