jfreechar柱状图中，如何设置最高值与最低值以及中间值三类柱的颜色？

Question

jfreechar柱状图中，如何设置最高值与最低值以及中间值三类柱的颜色？

Answer 1

[code="java"] String FONT="宋体";
JFreeChart localJFreeChart = ChartFactory.createBarChart(this.title, "", "金额(元)", paramCategoryDataset, PlotOrientation.VERTICAL, false, true, false);
localJFreeChart.setBackgroundPaint(new Color(255, 255, 255));
CategoryPlot localCategoryPlot = (CategoryPlot)localJFreeChart.getPlot();
CategoryAxis localCategoryAxis = localCategoryPlot.getDomainAxis();
localCategoryAxis.setMaximumCategoryLabelWidthRatio(0.8F);
localCategoryAxis.setLowerMargin(0.02D);
localCategoryAxis.setUpperMargin(0.02D);
NumberAxis localNumberAxis = (NumberAxis)localCategoryPlot.getRangeAxis();
localNumberAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());
BarRenderer localBarRenderer = (BarRenderer)localCategoryPlot.getRenderer();
localBarRenderer.setDrawBarOutline(false);
[color=red] GradientPaint localGradientPaint = new GradientPaint(0.0F, 0.0F, Color.green, 0.0F, 0.0F, Color.white);[/color] localBarRenderer.setSeriesPaint(0, localGradientPaint);

TextTitle textTitle = localJFreeChart.getTitle();
textTitle.setFont(new Font(FONT, Font.PLAIN, 20));

CategoryPlot plot = localJFreeChart.getCategoryPlot();
CategoryAxis domainAxis = plot.getDomainAxis();
ValueAxis rAxis = plot.getRangeAxis();
/*------设置X轴坐标上的文字-----------*/
domainAxis.setTickLabelFont(new Font(FONT, Font.PLAIN, 12));
/*------设置X轴的标题文字------------*/
domainAxis.setLabelFont(new Font(FONT, Font.PLAIN, 12));
/*------设置Y轴坐标上的文字-----------*/
rAxis.setTickLabelFont(new Font(FONT, Font.PLAIN, 12));
domainAxis.setCategoryLabelPositions(CategoryLabelPositions.DOWN_45);
/*------设置Y轴的标题文字------------*/
rAxis.setLabelFont(new Font(FONT, Font.PLAIN, 12));

  return localJFreeChart;[/code]

红字是设置柱的颜色及样式。
设置最高值与最低值以及中间值，你说这种估计不行吧。有几个柱状都是根据数据自动生成的。颜色也是统一设置的。