Jung Graph沒有顯示在Jpanel上

Question

我正在使用NetBeans創建一個應該能夠顯示圖形的SWING應用程序。 在演示應用程序中，我能夠使用以下代碼在JFrame上顯示生成的JUNG圖：

UndirectedGraph t = GraphML.CreateGraph("treeAttribute.graphml");
VisualizationViewer<Node, Edge> vv = new VisualizationViewer<Node, Edge>((new FRLayout<Node, Edge>(t)));
vv.getRenderContext().setVertexFillPaintTransformer(new VertexPainter());
vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller<Node>());
vv.getRenderContext().setEdgeLabelTransformer(new ToStringLabeller<Edge>());

final JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
frame.getContentPane().add(vv);
frame.pack();
frame.setVisible(true);

現在，我想使用Palette和設計模式，所以我創建了一個JFrame，並向其中插入了一個JPanel。 我希望將圖形顯示在JPanel中，因此已將圖形代碼插入initComponents（）方法中。 該代碼如下所示：

public class Main extends javax.swing.JFrame {


public Main() throws ParserConfigurationException, SAXException, IOException {
    initComponents();

}

@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">                          
private void initComponents() {

    jPanel1 = new javax.swing.JPanel();
    jLabel1 = new javax.swing.JLabel();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
    jPanel1.setLayout(jPanel1Layout);
    jPanel1Layout.setHorizontalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 634, Short.MAX_VALUE)
    );
    jPanel1Layout.setVerticalGroup(
        jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGap(0, 298, Short.MAX_VALUE)
    );

    jLabel1.setText("Graph A");

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addContainerGap()
            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                .addComponent(jLabel1)
                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
            .addContainerGap(45, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
        layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
        .addGroup(layout.createSequentialGroup()
            .addGap(39, 39, 39)
            .addComponent(jLabel1)
            .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
            .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
            .addContainerGap(42, Short.MAX_VALUE))
    );

    try {

        UndirectedGraph t = GraphML.CreateGraph("treeAttribute.graphml");
        VisualizationViewer<Node, Edge> vv = new VisualizationViewer<Node, Edge>((new FRLayout<Node, Edge>(t)));
        vv.getRenderContext().setVertexFillPaintTransformer(new VertexPainter());
        vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller<Node>());
        vv.getRenderContext().setEdgeLabelTransformer(new ToStringLabeller<Edge>());
        jPanel1.add(vv);

    } catch (ParserConfigurationException ex) {
        Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
    } catch (SAXException ex) {
        Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
    } catch (IOException ex) {
        Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
    }

    pack();
}// </editor-fold>                        

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {

    try {
        for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
            if ("Nimbus".equals(info.getName())) {
                javax.swing.UIManager.setLookAndFeel(info.getClassName());
                break;
            }
        }
    } catch (ClassNotFoundException ex) {
        java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (InstantiationException ex) {
        java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (IllegalAccessException ex) {
        java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    } catch (javax.swing.UnsupportedLookAndFeelException ex) {
        java.util.logging.Logger.getLogger(Main.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
    }
    //</editor-fold>

    /* Create and display the form */
    java.awt.EventQueue.invokeLater(new Runnable() {
        public void run() {
            try {
                new Main().setVisible(true);


            } catch (ParserConfigurationException ex) {
                Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
            } catch (SAXException ex) {
                Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
            } catch (IOException ex) {
                Logger.getLogger(Main.class.getName()).log(Level.SEVERE, null, ex);
            }

        }
    });

}

// Variables declaration - do not modify                     
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
// End of variables declaration                   
}

該程序正常運行，但未顯示任何內容到JPanel中。 我沒有收到任何錯誤或警告，並且圖形存在，因為它會為其頂點和邊緣打印一些信息。 有什么想法嗎？

Answer 1

通常在Netbeans中，這足以顯示圖表：

// say your graph is called g
layout = new FRLayout<>(g);
((FRLayout<yournode, youredge>)layout).setMaxIterations(1000);
layout.setSize(new Dimension(700, 700));
VisualizationViewer<yournode, youredge> vv = new VisualizationViewer<>(layout);
GraphZoomScrollPane scrollPane = new GraphZoomScrollPane(vv);
JPanel1.add(scrollPane);

但是您應該知道必須告訴Netbeans JPanel布局是什么，因此右鍵單擊窗口小部件，然后單擊“設置布局”，然后選擇所需的布局。