在JPanel上绘制SimpleWeightedGraph

Question

我有一个SimpleWeightedGraph,我想在JFrame中的JPanel上绘制它.不幸的是没有画出来.

我读了这篇文章.他们正在使用,ListenableDirectedGraph所以我尝试了一次ListenableUndirectedGraph没有成功.

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

看起来你要从你的问题中留下一些重要的细节,如果没有Minimal,Complete和Verifiable示例,很难说问题出在哪里.

但请注意,您尝试采用的样本非常陈旧.JGraph已经转移到了JGraphX.请考虑以下演示链接JGraphT和JGraphX使用的示例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;
    }
}

请注意,MyEdge扩展DefaultWeightedEdge为提供toString()显示边缘权重的自定义.更清洁的解决方案可能是覆盖mxGraph.convertValueToString,检查单元格的内容并根据需要提供自定义标签.toString是演示的快捷方式,我注意到它DefaultWeightedEdge.getWeight()是受保护的,所以无论如何都需要扩展:)