Drawing SimpleWeightedGraph on JPanel

Question

I have a SimpleWeightedGraph and I want to draw it on a JPanel in a JFrame. Unfortunately, nothing is drawn.

I read this article . They use ListenableDirectedGraph , so I tried ListenableUndirectedGraph without success.

 public class DisplayGraphForm extends javax.swing.JFrame { public DisplayGraphForm(SimpleWeightedGraph g) { initComponents(); // graphPanel added to JFrame with BorderLayout (Center) JGraphModelAdapter adapter = new JGraphModelAdapter(g); JGraph jgraph = new JGraph(adapter); graphPanel.add(jgraph); } } 

Answer 1

It seems that you are leaving some important details out of your question, and without a minimal, complete, and verifiable example, it's hard to tell where the problem is.

However, note that the sample you are trying to accept is very old. JGraph moved to JGraphX . Consider the following example demonstrating a JGraphT and JGraphX link using a JGraphXAdapter .

 import javax.swing.JFrame; import javax.swing.SwingUtilities; import org.jgrapht.ListenableGraph; import org.jgrapht.ext.JGraphXAdapter; import org.jgrapht.graph.DefaultWeightedEdge; import org.jgrapht.graph.ListenableDirectedWeightedGraph; import com.mxgraph.layout.mxCircleLayout; import com.mxgraph.layout.mxIGraphLayout; import com.mxgraph.swing.mxGraphComponent; public class DemoWeightedGraph { private static void createAndShowGui() { JFrame frame = new JFrame("DemoGraph"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); ListenableGraph<String, MyEdge> g = buildGraph(); JGraphXAdapter<String, MyEdge> graphAdapter = new JGraphXAdapter<String, MyEdge>(g); mxIGraphLayout layout = new mxCircleLayout(graphAdapter); layout.execute(graphAdapter.getDefaultParent()); frame.add(new mxGraphComponent(graphAdapter)); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } public static class MyEdge extends DefaultWeightedEdge { @Override public String toString() { return String.valueOf(getWeight()); } } public static ListenableGraph<String, MyEdge> buildGraph() { ListenableDirectedWeightedGraph<String, MyEdge> g = new ListenableDirectedWeightedGraph<String, MyEdge>(MyEdge.class); String x1 = "x1"; String x2 = "x2"; String x3 = "x3"; g.addVertex(x1); g.addVertex(x2); g.addVertex(x3); MyEdge e = g.addEdge(x1, x2); g.setEdgeWeight(e, 1); e = g.addEdge(x2, x3); g.setEdgeWeight(e, 2); e = g.addEdge(x3, x1); g.setEdgeWeight(e, 3); return g; } } 

Note that MyEdge extends DefaultWeightedEdge to provide a custom toString() that displays the edge mass. A cleaner solution would probably be to override mxGraph.convertValueToString , examine the contents of the cells, and provide custom labels as needed. toString is a shortcut for demonstration, and I also noticed that DefaultWeightedEdge.getWeight() is protected, so the extension is necessary anyway :)