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PlanarGraph()
findNode(Coordinate): Node
add(Node): void
add(Edge): void
add(DirectedEdge): void
nodeIterator(): Iterator
contains(Edge): boolean
contains(DirectedEdge): boolean
getNodes(): Collection
dirEdgeIterator(): Iterator
edgeIterator(): Iterator
getEdges(): Collection
remove(Edge): void
remove(DirectedEdge): void
remove(Node): void
findNodesOfDegree(int): List
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Source Classic

Class PlanarGraph

Hierarchy: Object , PlanarGraph
Direct Known Subclasses: LineMergeGraph, PolygonizeGraph
public abstract class PlanarGraph
Represents a directed graph which is embeddable in a planar surface.

This class and the other classes in this package serve as a framework for building planar graphs for specific algorithms. This class must be subclassed to expose appropriate methods to construct the graph. This allows controlling the types of graph components (DirectedEdges, Edges and Nodes) which can be added to the graph. An application which uses the graph framework will almost always provide subclasses for one or more graph components, which hold application-specific data and graph algorithms.

Other

  • version: 1.7
public PlanarGraph()
Constructs a empty graph.
public Node findNode(Coordinate pt)
Returns the Node at the given location, or null if no Node was there.
Parameters:
pt - pt the location to query
Returns:
the node found or null if this graph contains no node at the location
protected void add(Node node)
Adds a node to the map, replacing any that is already at that location. Only subclasses can add Nodes, to ensure Nodes are of the right type.
Parameters:
node - node the node to add
protected void add(Edge edge)
Adds the Edge and its DirectedEdges with this PlanarGraph. Assumes that the Edge has already been created with its associated DirectEdges. Only subclasses can add Edges, to ensure the edges added are of the right class.
protected void add(DirectedEdge dirEdge)
Adds the Edge to this PlanarGraph; only subclasses can add DirectedEdges, to ensure the edges added are of the right class.
public Iterator nodeIterator()
Returns an Iterator over the Nodes in this PlanarGraph.
public boolean contains(Edge e)
Tests whether this graph contains the given Edge
Parameters:
e - e the edge to query
Returns:
true if the graph contains the edge
public boolean contains(DirectedEdge de)
Tests whether this graph contains the given DirectedEdge
Parameters:
de - de the directed edge to query
Returns:
true if the graph contains the directed edge
public Collection getNodes()
public Iterator dirEdgeIterator()
Returns an Iterator over the DirectedEdges in this PlanarGraph, in the order in which they were added.
See also:
#add(Edge)
#add(DirectedEdge)
public Iterator edgeIterator()
Returns an Iterator over the Edges in this PlanarGraph, in the order in which they were added.
See also:
#add(Edge)
public Collection getEdges()
Returns the Edges that have been added to this PlanarGraph
See also:
#add(Edge)
public void remove(Edge edge)
Removes an Edge and its associated DirectedEdges from their from-Nodes and from the graph. Note: This method does not remove the Nodes associated with the Edge, even if the removal of the Edge reduces the degree of a Node to zero.
public void remove(DirectedEdge de)
Removes a DirectedEdge from its from- Node and from this graph. This method does not remove the Nodes associated with the DirectedEdge, even if the removal of the DirectedEdge reduces the degree of a Node to zero.
public void remove(Node node)
Removes a node from the graph, along with any associated DirectedEdges and Edges.
public List findNodesOfDegree(int degree)
Returns all Nodes with the given number of Edges around it.