JFreechart XYAreaChart改變顏色

Question

我有一個面積圖，我想着色圖表的區域是> 0的綠色和< 0的區域是紅色的。我嘗試了SetSeriesPaint()方法，但它使所有區域圖都用一種顏色着色。這個怎麼做？

這裏是我的代碼：

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);