我正在使用JFreeChart,以下是我开发的图表截图和相关代码。
private void getBarChart(List<Data> data) {
JFreeChart barChart = ChartFactory.createBarChart("", "", "", createDataset(data), PlotOrientation.VERTICAL, false, true, false);
CategoryPlot plot = barChart.getCategoryPlot();
plot.getRenderer().setSeriesPaint(0, new Color(7, 43, 97));
barChart.getCategoryPlot().getRangeAxis().setLowerBound(0);
barChart.getCategoryPlot().getRangeAxis().setUpperBound(1);
NumberAxis xAxis2 = (NumberAxis) barChart.getCategoryPlot().getRangeAxis();
xAxis2.setNumberFormatOverride(NumberFormat.getPercentInstance());
plot.getRenderer().setSeriesItemLabelGenerator(0, new StandardCategoryItemLabelGenerator());
plot.getRenderer().setSeriesItemLabelsVisible(1, true);
plot.getRenderer().setBaseItemLabelsVisible(true);
plot.getRenderer().setBaseSeriesVisible(true);
barChart.getCategoryPlot().setRenderer(plot.getRenderer());
BarRenderer.setDefaultBarPainter(new StandardBarPainter());
((BarRenderer) plot.getRenderer()).setBarPainter(new StandardBarPainter());
BufferedImage image = new BufferedImage(650, 250, BufferedImage.TYPE_INT_ARGB);
Graphics2D g2 = image.createGraphics();
g2.setRenderingHint(JFreeChart.KEY_SUPPRESS_SHADOW_GENERATION, true);
Rectangle r = new Rectangle(0, 0, 650, 250);
barChart.draw(g2, r);
BufferedImage chartImage = barChart.createBufferedImage(600, 400, null);
}
期望的图表应该类似于以下内容。
![enter image description here](https://istack.dev59.com/13Ms8.webp)
问题2.) 在每个条形图的顶部显示的值(SeriesItemLabels)需要使用类似于y轴的百分比符号(%)进行格式化。(我认为,就像我在xAxis2.setNumberFormatOverride中所做的那样,这些值将自动乘以100%。目前它仅显示小数值)。如何实现这一点?
请帮帮我。谢谢。