Hello World

import javax.swing.JFrame;

import prefuse.Display;
import prefuse.Visualization;
import prefuse.action.ActionList;
import prefuse.action.assignment.ColorAction;
import prefuse.action.layout.graph.NodeLinkTreeLayout;
import prefuse.data.Graph;
import prefuse.data.Node;
import prefuse.render.DefaultRendererFactory;
import prefuse.render.LabelRenderer;
import prefuse.util.ColorLib;
import prefuse.visual.VisualItem;

public class HelloWorldPrefuse extends Display {
    private static final String LABEL = "label";

    Graph graph;

    public static final String GRAPH = "graph";

    public static final String NODES = "graph.nodes";

    public static final String EDGES = "graph.edges";

    public HelloWorldPrefuse() {
        // setup a visualisation
        super(new Visualization());
        // generate a graph
        initGraph();

        //  standard labelRenderer for the given label
        LabelRenderer nodeRenderer = new LabelRenderer(LABEL);
        // rendererFactory for the visualization items 
        DefaultRendererFactory rendererFactory = new DefaultRendererFactory();
        // set the labelRenderer
        rendererFactory.setDefaultRenderer(nodeRenderer);
        m_vis.setRendererFactory(rendererFactory);

        // Color Actions
        ColorAction nodeText = new ColorAction(NODES, VisualItem.TEXTCOLOR);
        nodeText.setDefaultColor(ColorLib.gray(0));
        ColorAction nodeStroke = new ColorAction(NODES, VisualItem.STROKECOLOR);
        nodeStroke.setDefaultColor(ColorLib.gray(100));
        ColorAction nodeFill = new ColorAction(NODES, VisualItem.FILLCOLOR);
        nodeFill.setDefaultColor(ColorLib.gray(255));
        ColorAction edgeStrokes = new ColorAction(EDGES, VisualItem.STROKECOLOR);
        edgeStrokes.setDefaultColor(ColorLib.gray(100));

        // bundle the color actions
        ActionList draw = new ActionList();
        draw.add(nodeText);
        draw.add(nodeStroke);
        draw.add(nodeFill);
        draw.add(edgeStrokes);

        m_vis.putAction("draw", draw);

        // create the layout action for the graph
        NodeLinkTreeLayout treeLayout = new NodeLinkTreeLayout(GRAPH);
        m_vis.putAction("treeLayout", treeLayout);

        // run actions
        m_vis.run("treeLayout");
        m_vis.run("draw");
    }

    private void initGraph() {
        graph = new Graph();
        // first define a column
        graph.addColumn(LABEL, String.class);
        // then add nodes
        Node h = graph.addNode();
        h.setString(LABEL, "h");
        Node e = graph.addNode();
        e.setString(LABEL, "e");
        Node l1 = graph.addNode();
        l1.setString(LABEL, "l");
        Node l2 = graph.addNode();
        l2.setString(LABEL, "l");
        Node o1 = graph.addNode();
        o1.setString(LABEL, "o");
        Node blank = graph.addNode();
        blank.setString(LABEL, " ");
        Node w = graph.addNode();
        w.setString(LABEL, "w");
        Node o2 = graph.addNode();
        o2.setString(LABEL, "o");
        Node r = graph.addNode();
        r.setString(LABEL, "r");
        Node l3 = graph.addNode();
        l3.setString(LABEL, "l");
        Node d = graph.addNode();
        d.setString(LABEL, "d");
        // then add the edges
        graph.addEdge(h, e);
        graph.addEdge(e, l1);
        graph.addEdge(l1, l2);
        graph.addEdge(l2, o1);
        graph.addEdge(o1, blank);
        graph.addEdge(blank, w);
        graph.addEdge(w, o2);
        graph.addEdge(o2, r);
        graph.addEdge(r, l3);
        graph.addEdge(l3, d);

        m_vis.addGraph(GRAPH, graph);

    }

    public static void main(String[] args) {
        HelloWorldPrefuse hello = new HelloWorldPrefuse();
        JFrame frame = new JFrame("Hello World");
        frame.getContentPane().add(hello);
        frame.pack();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(800,400);

        frame.setVisible(true);

    }

}