Class Edge

Hierarchy: Object , GraphComponent, Edge

Direct Known Subclasses: LineMergeEdge, PolygonizeEdge

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.

Other

version: 1.7

public Edge()

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

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.

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.

public DirectedEdge getDirEdge(int i)

Returns one of the DirectedEdges associated with this Edge.

Parameters:: i - i 0 or 1. 0 returns the forward directed edge, 1 returns the reverse

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.

public Node getOppositeNode(Node node)

If node is one of the two nodes associated with this Edge, returns the other node; otherwise returns null.

public boolean isRemoved()

Tests whether this edge has been removed from its containing graph

Returns:: true if this edge is removed