JFreeChart：自定义饼图以显示绝对值和百分比

Question

JFreeChart：自定义饼图以显示绝对值和百分比

javajfreechartpercentagepie-chartabsolute-value

11

这个可编译的最小代码片段示例使用JFreeChart作为绘图API，如何使其适应同时显示绝对值和百分比？

我从互联网上的任何代码片段或JFreechart手册中都无法提取此信息。该代码片段生成一个仅显示百分比的饼图。在我的情况下，绝对值也很重要，因此我需要将它们正确地显示在百分比下方。

以下是代码：（注意缺少导入）

public class MyMinimalPieChartExample {
    public static void main(String[] args) {
    DefaultPieDataset dataset = new DefaultPieDataset();
    dataset.setValue("some data 1",99);
    dataset.setValue("some data 2", 77);

    //third adaption
    JFreeChart someChart = ChartFactory.createPieChart(
            "some chart header", dataset,
            true, true, false);
    PiePlot illegalLegalRestPiePlot4 = (PiePlot) someChart.getPlot();
    illegalLegalRestPiePlot4.setSectionPaint("some data 1", new Color(0, 255, 0));
    illegalLegalRestPiePlot4.setSectionPaint("some data 2",
            new Color(255, 0, 0));
    PiePlot plot4 = (PiePlot) someChart.getPlot();
    plot4.setExplodePercent("some data 1", 0.4);
    plot4.setSimpleLabels(true);

    PieSectionLabelGenerator generator = new StandardPieSectionLabelGenerator(
            "{0} = {2}", new DecimalFormat("0"), new DecimalFormat("0.00%"));
    plot4.setLabelGenerator(generator);

    try {
        ChartUtilities.saveChartAsJPEG(new File("C:/myMinimalPieChartExample.jpeg"),
                someChart, 1200, 1000);
    } catch (Exception e) {
        System.err.println("couldn't write chart");
    }
    }
}

- kiltek

1个回答

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- trashgod · Accepted Answer

使用MessageFormat符号{1}表示绝对部分值。

有关详细信息，请参见StandardPieSectionLabelGenerator。

饼状图

public class MyMinimalPieChartExample {

    private static final String KEY1 = "Datum 1";
    public static final String KEY2 = "Datum 2";

    public static void main(String[] args) {
        DefaultPieDataset dataset = new DefaultPieDataset();
        dataset.setValue(KEY1, 99);
        dataset.setValue(KEY2, 77);

        JFreeChart someChart = ChartFactory.createPieChart(
            "Header", dataset, true, true, false);
        PiePlot plot = (PiePlot) someChart.getPlot();
        plot.setSectionPaint(KEY1, Color.green);
        plot.setSectionPaint(KEY2, Color.red);
        plot.setExplodePercent(KEY1, 0.10);
        plot.setSimpleLabels(true);

        PieSectionLabelGenerator gen = new StandardPieSectionLabelGenerator(
            "{0}: {1} ({2})", new DecimalFormat("0"), new DecimalFormat("0%"));
        plot.setLabelGenerator(gen);

        JFrame f = new JFrame("Test");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.add(new ChartPanel(someChart) {
            @Override
            public Dimension getPreferredSize() {
                return new Dimension(400, 300);
            }
        });
        f.pack();
        f.setLocationRelativeTo(null);
        f.setVisible(true);

    }
}