如何在NetBeans项目中显示JFreeChart [英] How to display a JFreeChart in a NetBeans project

问题描述

这类似于我昨天提出的一个问题，但问题更具体。
将JFreeChart添加到已包含各种小部件的NetBeans项目的正确方法是什么？
我的updateChart（）隐藏了整个JFrame。
我想将JFreeChart添加到JFrame。

This is similar to a question I asked yesterday but more specific to the problem. What is the correct method to add a JFreeChart to a NetBeans project which already contains various widgets? My updateChart() hides the entire JFrame. I'd like to add the JFreeChart to the JFrame.

public class MyClass extends javax.swing.JFrame implements TableModelListener {
    public MyClass() {
        initComponents();
        ...
        updateChart();
    }
    private void updateChart() {
        XYDataset dataset = createXYdataset();
        JFreeChart chart = createChart(dataset);
        JPanel chartPanel = new ChartPanel(chart);
        setContentPane(chartPanel);
    }
    private XYDataset createXYdataset() {
        XYSeries series = new XYSeries("");
        int rows = jTable.getRowCount();
        if (rows > 0) {
            int ms = 0;
            for (int row = 0; row < rows; row++) {
                series.add(ms, 1);
                ms += Integer.parseInt(
                        jTable.getValueAt(row, PULSE_ON).toString());
                series.add(ms, 1);
                series.add(ms, 0);
                ms += Integer.parseInt(
                        jTable.getValueAt(row, PULSE_OFF).toString());
                series.add(ms, 0);
            }
        }
        XYSeriesCollection dataset = new XYSeriesCollection();
        dataset.addSeries(series);
        return dataset;
    }
    private JFreeChart createChart(XYDataset dataset) {
        JFreeChart chart = ChartFactory.createXYLineChart(
            null,      // chart title
            "ms",                      // x axis label
            null,                      // y axis label
            dataset,                  // data
            PlotOrientation.VERTICAL,
            false,                     // include legend
            true,                     // tooltips
            false                     // urls
        );
        XYPlot plot = (XYPlot) chart.getPlot();
        plot.setDomainPannable(true);
        plot.setRangePannable(true);
        plot.setRangeGridlinesVisible(false);
        NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();
        rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
        return chart;
    }
}

更正代码：

private void updateChart() {
    XYDataset dataset = createXYdataset();
    JFreeChart chart = createChart(dataset);
    JPanel chartPanel = new ChartPanel(chart);
    chartPanel.setSize(jPanel1.getSize());
    jPanel1.add(chartPanel);
    jPanel1.getParent().validate();
}

推荐答案

我的updateChart（）隐藏了整个
JFrame。

My updateChart() hides the entire JFrame.

JFreeChart chart = createChart(dataset); 
JPanel chartPanel = new ChartPanel(chart); 
setContentPane(chartPanel); 

这是因为您要使用免费图表中的面板替换框架的内容窗格。

That would be because you are replacing the content pane of your frame with the panel from free chart.

我不知道你正在使用什么版面管理器，但你需要将免费图表面板添加到包含所有其他组件的面板。因此，当您在Netbeans中设计常规表单时，可以将空面板添加到要添加免费图表面板的位置。然后，当您添加免费图表面板时，代码将类似于：

I don't know what layout manager you are using, but you need to "ADD" the free chart panel to the panel that contains all the other components. So maybe when you design the general form in Netbeans you add an empty panel to the place where you want the free chart panel to be added. Then when you add the free chart panel the code would be something like:

emptyFreeChartPanel.add( chartPanel );
emptyFreeChartPanel.getParent().validate();

验证告诉Swing已添加组件，以便调用布局管理器。

The validate tells Swing that components have been added so the layout manager will be invoked.

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