如何自定义 JFreeChart 图形的颜色。
让我们看看我的java代码:
private StreamedContent chartImage ;
public void init(){
JFreeChart jfreechart = ChartFactory.createPieChart("title", createDataset(), true, true, false);
File chartFile = new File("dynamichart");
ChartUtilities.saveChartAsPNG(chartFile, jfreechart, 375, 300);
chartImage = new DefaultStreamedContent(new FileInputStream( chartFile), "image/png");
}
public PieDataset createDataset() {
DefaultPieDataset dataset = new DefaultPieDataset();
dataset.setValue("J-2", 10);
dataset.setValue("J-1", 15);
dataset.setValue("J", 50);
dataset.setValue("J+1", 20);
dataset.setValue("J+2", 15);
return dataset;
}
html页面:
<p:graphicImage id="MyImage" value="#{beanCreateImage.chartImage}" />
您可以像这样更改单件的颜色:
JFreeChart chart = ChartFactory.createPieChart("title", createDataset(), true, true, false);
PiePlot plot = (PiePlot) chart.getPlot();
plot.setSectionPaint("J+1", Color.black);
plot.setSectionPaint("J-1", new Color(120, 0, 120));
// or do this, if you are using an older version of JFreeChart:
//plot.setSectionPaint(1, Color.black);
//plot.setSectionPaint(3, new Color(120, 0, 120));
因此,使用您的代码,所有馅饼都会自动着色,在我的代码更改后,J-1
and J+1
有固定颜色,其余部分会自动着色。
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