如果您不想显示标签,请创建自定义PieSectionLabelGenerator
并返回null
。
例
public class PieMaximumLabelsGenerator extends StandardPieSectionLabelGenerator {
private static final long serialVersionUID = 1385777973353453096L;
private int nrLabels;
private boolean showFirst;
/**
* A custom label generator to show only limited numbers of labels
* @param nrLabels, number of labels to show
* @param showFirst, if true, show first labels otherwise show the last
*/
public PieMaximumLabelsGenerator(int nrLabels, boolean showFirst){
this.nrLabels = nrLabels;
this.showFirst = showFirst;
}
@Override
public String generateSectionLabel(PieDataset dataset, Comparable key) {
int index = dataset.getIndex(key);
if (showFirst){
if (index>=nrLabels){
return null; //no more lables if index is above
}
}else{
if (index<dataset.getItemCount()-nrLabels){
return null; //no labels if index is not enough
}
}
return super.generateSectionLabel(dataset, key);
}
}
然后将其设置为您的情节
((PiePlot) chart.getPlot()).setLabelGenerator(new PieMaximumLabelsGenerator(3, false));
输出,类似的例子,但显示前5个值而不是最后3个,因此((PiePlot) chart.getPlot()).setLabelGenerator(new PieMaximumLabelsGenerator(5, true));
然而,我的偏好是如果切片的弧角足够大则显示标签。这可以通过收集图表中项目的总值,然后使用Number value = dataset.getValue(key);
中的generateSectionLabel
计算角度来获得切片的当前角度(维度)。