org.jgrapht.generate

Class GridGraphGenerator<V,E>

java.lang.Object

org.jgrapht.generate.GridGraphGenerator<V,E>

All Implemented Interfaces:

GraphGenerator<V,E,V>

public class GridGraphGenerator<V,E>
extends Object
implements GraphGenerator<V,E,V>

Generates a bidirectional grid graph of any size. A grid graph is a two dimensional graph whose vertices correspond to the points in the plane with integer coordinates, x-coordinates being in the range 0,..., n, y-coordinates being in the range 1,...m, and two vertices are connected by an edge whenever the corresponding points are at distance 1. Vertices are created from left to right and from top to bottom.

Since:

Dec 29, 2010

Author:

Assaf Mizrachi

Field Summary

Fields

Modifier and Type	Field and Description
static String	CORNER_VERTEX Role for the vertices at the corners.

Constructor Summary

Constructors

Constructor and Description
GridGraphGenerator(int rows, int cols) Creates a new GridGraphGenerator object with rows x cols dimension.

Method Summary

Methods

Modifier and Type	Method and Description
void	generateGraph(Graph<V,E> target, VertexFactory<V> vertexFactory, Map<String,V> resultMap) Generate a graph structure.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

CORNER_VERTEX

public static final String CORNER_VERTEX

Role for the vertices at the corners.

See Also:

Constant Field Values

Constructor Detail

GridGraphGenerator

public GridGraphGenerator(int rows,
                  int cols)

Creates a new GridGraphGenerator object with rows x cols dimension.

Parameters:

rows - the number of rows

cols - the number of columns

Method Detail

generateGraph

public void generateGraph(Graph<V,E> target,
                 VertexFactory<V> vertexFactory,
                 Map<String,V> resultMap)

Generate a graph structure. The topology of the generated graph is dependent on the implementation. For graphs in which not all vertices share the same automorphism equivalence class, the generator may produce a labeling indicating the roles played by generated elements. This is the purpose of the resultMap parameter. For example, a generator for a wheel graph would designate a hub vertex. Role names used as keys in resultMap should be declared as public static final Strings by implementation classes.

Specified by:

generateGraph in interface GraphGenerator<V,E,V>

Parameters:

target - receives the generated edges and vertices; if this is non-empty on entry, the result will be a disconnected graph since generated elements will not be connected to existing elements

vertexFactory - called to produce new vertices

resultMap - if non-null, receives implementation-specific mappings from String roles to graph elements (or collections of graph elements)