JGraphT examples

Question

I would like to plot lines on a simple x,y graph to display in a JApplet using JGraphT. The examples I found were not very helpful. Could someone please point me to a few simple JGraphT examples?

Answer 1

here an example I hope will help jgrapht

Answer 2

package simple;

import java.awt.*;
import java.awt.geom.*;


import javax.swing.*;


import org.jgraph.JGraph;
import org.jgraph.graph.AttributeMap;
import org.jgraph.graph.DefaultGraphCell;
import org.jgraph.graph.GraphConstants;
import org.jgrapht.*;
import org.jgrapht.ext.*;
import org.jgrapht.graph.*;

// resolve ambiguity
import org.jgrapht.graph.DefaultEdge;

import com.compilervision.common.CFNode;
import com.compilervision.common.llvmir.instructions.CFG;
import com.compilervision.common.Edge;

/**
 * A demo applet that shows how to use JGraph to visualize JGraphT graphs.
 *
 * @author Barak Naveh
 * @since Aug 3, 2003
 */
public class Test
    extends JApplet
{
    //~ Static fields/initializers ---------------------------------------------

    private static final long serialVersionUID = 3256444702936019250L;
    private static final Color DEFAULT_BG_COLOR = Color.decode("#FAFBFF");
    private static final Dimension DEFAULT_SIZE = new Dimension(530, 320);

    //~ Instance fields --------------------------------------------------------

    //
    private JGraphModelAdapter<CFNode, Edge> jgAdapter;

    //~ Methods ----------------------------------------------------------------

    /**
     * An alternative starting point for this demo, to also allow running this
     * applet as an application.
     *
     * @param args ignored.
     */
    public static void main(String [] args)
    {
        Test applet = new Test();
        applet.init();

        JFrame frame = new JFrame();
        frame.getContentPane().add(applet);
        frame.setTitle("JGraphT Adapter to JGraph Demo");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }

    /**
     * {@inheritDoc}
     */
    public void init()
    { 


        // create a JGraphT graphq
        ListenableGraph<CFNode, Edge> g =
            new ListenableDirectedMultigraph<CFNode, Edge>(
                    Edge.class);

        // create a visualization using JGraph, via an adapter
        jgAdapter = new JGraphModelAdapter<CFNode,Edge>(g);

        JGraph jgraph = new JGraph(jgAdapter);

        adjustDisplaySettings(jgraph);
        getContentPane().add(jgraph);
        resize(DEFAULT_SIZE);

        String v1 = "v1";
        String v2 = "v2";
       String v3 = "v3";
        String v4 = "v4";

        // 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
        //GraphSimpleLayout()
        positionVertexAt(v1, 130, 140);
        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);
    }

    @SuppressWarnings("unchecked") // FIXME hb 28-nov-05: See FIXME below
    private void positionVertexAt(Object vertex, int x, int y)
    {
        DefaultGraphCell cell = jgAdapter.getVertexCell(vertex);
        AttributeMap attr = cell.getAttributes();
        Rectangle2D bounds = GraphConstants.getBounds(attr);

        Rectangle2D newBounds = new Rectangle2D.Double(x,y,bounds.getWidth(),bounds.getHeight());

        GraphConstants.setBounds(attr, newBounds);

        // TODO: Clean up generics once JGraph goes generic
        org.jgraph.graph.AttributeMap cellAttr = new AttributeMap();
        cellAttr.put(cell, attr);
        jgAdapter.edit(cellAttr, null, null, null);
    }

    //~ Inner Classes ----------------------------------------------------------

    /**
     * a listenable directed multigraph that allows loops and parallel edges.
     */
    private static class ListenableDirectedMultigraph<V, E>
        extends DefaultListenableGraph<V, E>
        implements DirectedGraph<V, E>
    {
        private static final long serialVersionUID = 1L;

        ListenableDirectedMultigraph(Class<E> edgeClass)
        {
            super(new DirectedMultigraph<V, E>(edgeClass));
        }
    }
}

// End JGraphAdapterDemo.java