JFreeChart:设置XY图表的线条颜色 - 4个系列,2个数据集,双轴

Question

我似乎无法为所有四条线设置单独的线条颜色.当我使用线条时:

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条线设置不同的颜色？

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;
}

Answer 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;

Answer 2

I\xc2\xb4d 创建我自己的绘图和两个渲染器，而new不是chart.getPlot()或plot.getRenderer()。I\xc2\xb4ll 尝试给出一个与您的代码类似的示例，以便您明白我的意思；你\xc2\xb4ll必须调整它以满足你的需要：

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 private JFreeChart createChart(String title) {\n    XYDataset dataset1 = createDataset1();\n    XYDataset dataset2 = createDataset2();\n\n    XYBarRenderer renderer1 = new XYBarRenderer(0.20000000000000001D);\n    renderer1.setSeriesPaint(0, Color.BLUE);\n    renderer1.setSeriesPaint(1, Color.red);\n    DateAxis domainAxis = new DateAxis("Date");\n    NumberAxis valueAxis = new NumberAxis("Value");\n    XYPlot plot = new XYPlot(dataset1, domainAxis, valueAxis, renderer1);\n\n    StandardXYItemRenderer renderer2 = new StandardXYItemRenderer();\n    renderer2.setSeriesPaint(0, Color.CYAN);\n    renderer2.setSeriesPaint(1, Color.YELLOW);\n\n    plot.setDataset(1, dataset2);\n    plot.setRenderer(1, renderer2);\n\n    JFreeChart chart = new JFreeChart(title, JFreeChart.DEFAULT_TITLE_FONT, plot, true);\n\n    return chart;\n}\n

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编辑：顺便说一句，如果您经常使用 JFreeChart，我\xc2\xb4d 建议购买该指南。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。

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