java - 如何在NetBeans生成的Jpanel中显示JfreeChart(ChartPanel)

Question

我已经使用 netbeans gui 生成器生成了一个 GUI。我有两个面板，其中一个我想显示一个图表面板。 netbeans生成的代码是:

private void initComponents() {

        jPanel1 = new javax.swing.JPanel();

        org.jdesktop.layout.GroupLayout jPanel1Layout = new org.jdesktop.layout.GroupLayout(jPanel1);
        jPanel1.setLayout(jPanel1Layout);
        jPanel1Layout.setHorizontalGroup(
            jPanel1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 394, Short.MAX_VALUE)
        );
        jPanel1Layout.setVerticalGroup(
            jPanel1Layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 294, Short.MAX_VALUE)
        );

        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(this);
        this.setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 400, Short.MAX_VALUE)
            .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                .add(org.jdesktop.layout.GroupLayout.TRAILING, layout.createSequentialGroup()
                    .add(jPanel1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addContainerGap()))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(0, 300, Short.MAX_VALUE)
            .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                .add(layout.createSequentialGroup()
                    .add(jPanel1, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addContainerGap()))
        );
    }

我将图表面板添加到 jpanel 所做的是:

TimeSeriesCollection dataset = new TimeSeriesCollection();
            for (int i = 0; i < 5; i++) {
                TimeSeries pop = new TimeSeries("try "+i, Day.class);
                pop.add(new Day(10+i, 1+i, 2004+i), 100*(i+2));
                pop.add(new Day(10+1*i, 1+2+i, 2004+i+1), 150*(i+2));
                pop.add(new Day(10+2*i, 1+2*i, 2004+i+2), 150*(i+3));
                pop.add(new Day(10+3*i, 1+2*i, 2004+i+3), 150*(i+4));
                pop.add(new Day(10+4*i, 1+2*i, 2004+i+10), 150*(i+5));
                dataset.addSeries(pop);
            }
            TimeSeries pop = new TimeSeries("Try asjhaihsiuahsiuahiushaiushiauhsiuhasiua"+100, Day.class);
            int i=5;
                pop.add(new Day(1, 1+i, 2004+i), 100*(i+2));
                pop.add(new Day(2, 1+2+i, 2004+i+1), 150*(i+2));
                pop.add(new Day(3, 1+2*i, 2004+i+2), 150*(i+3));
                pop.add(new Day(4, 1+2*i, 2004+i+3), 150*(i+4));
                pop.add(new Day(5, 1+2*i, 2004+i+10), 1500*(i+5));
                dataset.addSeries(pop);
            JFreeChart chart = ChartFactory.createTimeSeriesChart(
                    "Population of CSC408 Town",
                    "Date",
                    "Population",
                    dataset,
                    true,
                    true,
                    false);
            ChartPanel p = new ChartPanel(chart);

            jPanel1.add(p);

但是图表面板不会显示在 jpanel 内..我该怎么办？你能帮我吗？

Answer 1

将 NetBeans 面板中的布局设置为 BorderLayout (通过在设计预览中右键单击它然后设置布局，或通过代码 Panel.setLayout 进行设置)，之后当您想要显示图表面板时，只需添加图表面板进入父面板并要求重新绘制。

netbeansPanel.add(charPanel, BorderLayout.CENTER);
netbeansPanel.validate();

如果您想用新面板更新图表，您也可以删除该面板:

netbeansPanel.removeAll();
netbeansPanel.add(charPanel);
netbeansPanel.validate();