JFreeChart：为 XY 图表设置线条颜色 - 4 系列、2 个数据集、双轴答案

【问题标题】：JFreeChart: set line colors for XY Chart - 4 series, 2 datasets, dual axesJFreeChart：为 XY 图表设置线条颜色 - 4 系列、2 个数据集、双轴
【发布时间】：2014-01-29 10:07:11
【问题描述】：

我似乎无法为所有四行设置单独的行颜色。当我使用这些线条时：

plot.getRenderer().setSeriesPaint(0, new Color(0x00, 0xFF, 0x00));
plot.getRenderer().setSeriesPaint(1, new Color(0x00, 0x00, 0x00));

（在下面的代码中），它将第一行应用于 BOTH 数据集中的 FIRST 系列，将第二行应用于 BOTH 数据集中的 SECOND 系列。

如何为所有 4 行设置不同的颜色？

谢谢！

private JFreeChart createXYLineChart(String title) {
    XYDataset dataset1 = createXYVoltageDataset();
    XYDataset dataset2 = createXYCurrentDataset();

    JFreeChart chart = ChartFactory.createXYLineChart("Profile", "Set Current", "Voltage", null);
    XYPlot plot = (XYPlot) chart.getPlot(); 
    plot.setDataset(0, dataset1);
    plot.setDataset(1, dataset2);

    plot.setRangeAxis(1, new NumberAxis("Actual Current")); 
    plot.mapDatasetToRangeAxis(1, 1); //2nd dataset to 2nd y-axi

    plot.setBackgroundPaint(new Color(0xFF, 0xFF, 0xFF));
    plot.setDomainGridlinePaint(new Color(0x00, 0x00, 0xff));
    plot.setRangeGridlinePaint(new Color(0xff, 0x00, 0x00));

    plot.getRenderer().setSeriesPaint(0, new Color(0x00, 0xFF, 0x00));
    plot.getRenderer().setSeriesPaint(1, new Color(0x00, 0x00, 0x00));
    //plot.getRenderer().setSeriesPaint(2, new Color(0xFF, 0x00, 0x00)); // Does nothing
    //plot.getRenderer().setSeriesPaint(3, new Color(0x00, 0x00, 0xFF)); // Does nothing
    //plot.getRenderer(1).setSeriesPaint(3, new Color(0x00, 0x00, 0xFF)); // Null pointer exceptiopn

    return chart;
}

private  XYDataset createXYVoltageDataset() {
    final XYSeries s1 = new XYSeries("Min Voltage");
    final XYSeries s2 = new XYSeries("Max Voltage");
    for (int i = 0; i < profile.getNumSteps(); i++) s1.add(i, profile.getStepMinVoltage(i));
    for (int i = 0; i < profile.getNumSteps(); i++) s2.add(i, profile.getStepMaxVoltage(i));
    XYSeriesCollection dataset = new XYSeriesCollection();
    dataset.addSeries(s1);
    dataset.addSeries(s2);
    return dataset;
}
private  XYDataset createXYCurrentDataset() {
    final XYSeries s1 = new XYSeries("Min Current");
    final XYSeries s2 = new XYSeries("Max Current");
    for (int i = 0; i < profile.getNumSteps(); i++){
        s1.add(i, profile.getStepMinCurrent(i));
    }
    for (int i = 0; i < profile.getNumSteps(); i++) s2.add(i, profile.getStepMaxCurrent(i));
    XYSeriesCollection dataset = new XYSeriesCollection();
    dataset.addSeries(s1);
    dataset.addSeries(s2);
    return dataset;
}

【问题讨论】：

标签： java jfreechart

【解决方案1】：

这是我的最终解决方案：

XYDataset dataset1 = createXYVoltageDataset();
XYDataset dataset2 = createXYCurrentDataset();

XYLineAndShapeRenderer r1 = new XYLineAndShapeRenderer();
r1.setSeriesPaint(0, new Color(0xff, 0xff, 0x00)); 
r1.setSeriesPaint(1, new Color(0x00, 0xff, 0xff)); 
r1.setSeriesShapesVisible(0,  false);
r1.setSeriesShapesVisible(1,  false);

XYLineAndShapeRenderer r2 = new XYLineAndShapeRenderer();
r2.setSeriesPaint(0, new Color(0xff, 0x00, 0x00)); 
r2.setSeriesPaint(1, new Color(0x00, 0xff, 0x00)); 
r2.setSeriesShapesVisible(0,  false);
r2.setSeriesShapesVisible(1,  false);

JFreeChart chart = ChartFactory.createXYLineChart("Profile", "Set Current", "Voltage", null);
XYPlot plot = (XYPlot) chart.getPlot(); 

plot.setDataset(0, dataset1);
plot.setRenderer(0, r1);

plot.setDataset(1, dataset2);
plot.setRenderer(1, r2);

plot.setRangeAxis(1, new NumberAxis("Actual Current")); 
plot.mapDatasetToRangeAxis(1, 1); //2nd dataset to 2nd y-axi

plot.setBackgroundPaint(new Color(0xFF, 0xFF, 0xFF));
plot.setDomainGridlinePaint(new Color(0x00, 0x00, 0xff));
plot.setRangeGridlinePaint(new Color(0xff, 0x00, 0x00));

return chart;

【讨论】：

【解决方案2】：

我会创建自己的情节和两个渲染器，使用 new 而不是 chart.getPlot() 或 plot.getRenderer()。我将尝试举一个类似于您的代码的示例，以便您明白我的意思；你必须调整它以满足你的需要：

 private JFreeChart createChart(String title) {
    XYDataset dataset1 = createDataset1();
    XYDataset dataset2 = createDataset2();

    XYBarRenderer renderer1 = new XYBarRenderer(0.20000000000000001D);
    renderer1.setSeriesPaint(0, Color.BLUE);
    renderer1.setSeriesPaint(1, Color.red);
    DateAxis domainAxis = new DateAxis("Date");
    NumberAxis valueAxis = new NumberAxis("Value");
    XYPlot plot = new XYPlot(dataset1, domainAxis, valueAxis, renderer1);

    StandardXYItemRenderer renderer2 = new StandardXYItemRenderer();
    renderer2.setSeriesPaint(0, Color.CYAN);
    renderer2.setSeriesPaint(1, Color.YELLOW);

    plot.setDataset(1, dataset2);
    plot.setRenderer(1, renderer2);

    JFreeChart chart = new JFreeChart(title, JFreeChart.DEFAULT_TITLE_FONT, plot, true);

    return chart;
}

编辑：顺便说一下，如果您经常使用 JFreeChart，我建议您购买该指南。除了非常有用的 PDF 之外，您还可以在演示中心获得所有示例的源代码，这是非常宝贵的。

【讨论】：