JFreechart XYAreaChart改变颜色

Question

我有一个面积图，我想为图表的区域着色，绿色> 0，红色区域<0。我尝试了SetSeriesPaint()方法，但它使所有区域图表都用一种颜色着色。怎么做？

这是我的代码：

final XYSeries series = new XYSeries("Data");

XYSeriesCollection dataset = new XYSeriesCollection(series);


JFreeChart chart = ChartFactory.createXYAreaChart("Fun Meter", "", "",
        dataset, PlotOrientation.VERTICAL, false, false, false);


// jframe=new ChartFrame("Fun Meter", chart);

ChartPanel CP = new ChartPanel(chart);

XYPlot xyPlot = (XYPlot) chart.getPlot();



xyPlot.getRenderer().setSeriesPaint(0, Color.red);

xyPlot.setForegroundAlpha(0.75f);

Answer 1

使用XYDifferenceRenderer：

XYDifferenceRenderer r = new XYDifferenceRenderer(Color.green,Color.red, false);
plot.setRenderer(r);