The following applet shows how a JGraphT graph can be visualized using JGraph. Try to play and drag around the vertices and edges to get the feel of it.
Note: Java 1.3 or above must be installed for this applet to work correctly.
It's very simple: the JGraphT library comes with an adapter that makes JGraphT graphs compatible with JGraph. To visualize a JGraphT graph you just need to initialize JGraph via that adapter.
Example code:
// create a JGraphT graph
ListenableGraph g = new ListenableDirectedGraph( DefaultEdge.class );
// create a visualization using JGraph, via the adapter
JGraph jgraph = new JGraph( new JGraphModelAdapter( g ) );
Is that all?! Yes, that's all. Any modification now made to the graph g will
automatically be reflected by the JGraph component.
The full source code of this demo is listed below and is also included in the
JGraphT distribution (download now).
package org.jgrapht.demo;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.util.HashMap;
import java.util.Map;
import javax.swing.JApplet;
import javax.swing.JFrame;
import org.jgraph.JGraph;
import org.jgraph.graph.DefaultGraphCell;
import org.jgraph.graph.GraphConstants;
import org.jgrapht.ListenableGraph;
import org.jgrapht.ext.JGraphModelAdapter;
import org.jgrapht.graph.ListenableDirectedGraph;
import org.jgrapht.graph.DefaultEdge;
/**
* A demo applet that shows how to use JGraph to visualize JGraphT graphs.
*
* @author Barak Naveh
*
* @since Aug 3, 2003
*/
public class JGraphAdapterDemo extends JApplet {
private static final Color DEFAULT_BG_COLOR = Color.decode( "#FAFBFF" );
private static final Dimension DEFAULT_SIZE = new Dimension( 530, 320 );
//
private JGraphModelAdapter m_jgAdapter;
/**
* @see java.applet.Applet#init().
*/
public void init( ) {
// create a JGraphT graph
ListenableGraph g = new ListenableDirectedGraph( DefaultEdge.class );
// create a visualization using JGraph, via an adapter
m_jgAdapter = new JGraphModelAdapter( g );
JGraph jgraph = new JGraph( m_jgAdapter );
adjustDisplaySettings( jgraph );
getContentPane( ).add( jgraph );
resize( DEFAULT_SIZE );
// add some sample data (graph manipulated via JGraphT)
g.addVertex( "v1" );
g.addVertex( "v2" );
g.addVertex( "v3" );
g.addVertex( "v4" );
g.addEdge( "v1", "v2" );
g.addEdge( "v2", "v3" );
g.addEdge( "v3", "v1" );
g.addEdge( "v4", "v3" );
// position vertices nicely within JGraph component
positionVertexAt( "v1", 130, 40 );
positionVertexAt( "v2", 60, 200 );
positionVertexAt( "v3", 310, 230 );
positionVertexAt( "v4", 380, 70 );
// that's all there is to it!...
}
private void adjustDisplaySettings( JGraph jg ) {
jg.setPreferredSize( DEFAULT_SIZE );
Color c = DEFAULT_BG_COLOR;
String colorStr = null;
try {
colorStr = getParameter( "bgcolor" );
}
catch( Exception e ) {}
if( colorStr != null ) {
c = Color.decode( colorStr );
}
jg.setBackground( c );
}
private void positionVertexAt( Object vertex, int x, int y ) {
DefaultGraphCell cell = m_jgAdapter.getVertexCell( vertex );
Map attr = cell.getAttributes( );
Rectangle b = GraphConstants.getBounds( attr );
GraphConstants.setBounds( attr, new Rectangle( x, y, b.width, b.height ) );
Map cellAttr = new HashMap( );
cellAttr.put( cell, attr );
m_jgAdapter.edit( cellAttr, null, null, null, null );
}
}
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| © Copyright 2003, by Barak Naveh and Contributors. All rights reserved. |
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