com.vividsolutions.jts.planargraph

Class 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.

    • Field Detail

      • dirEdge

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

    • Constructor Detail

      • 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 Detail

      • 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