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

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;
}

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;