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There is no default API. But you can implement your custom JfreeChartEngine to achieve. See examples:

• https://github.com/zkoss/zkbooks/blob/master/componentreference/src/main/java/org/zkoss/reference/component/diagrams/MyJfreeChartEngine.java
• https://github.com/zkoss/zkbooks/blob/master/componentreference/src/main/webapp/diagrams/chart-gantt.zul

You need to find the corresponding jfreechart api to change the label of a pie chart, it could be: * https://www.jfree.org/jfreechart/javadoc/org/jfree/chart/labels/PieSectionLabelGenerator.html * https://www.jfree.org/jfreechart/javadoc/org/jfree/chart/labels/PieToolTipGenerator.html

There is no default buillt-in API. But you can implement your custom JfreeChartEngine to achieve. achieve it. See examples:

• https://github.com/zkoss/zkbooks/blob/master/componentreference/src/main/java/org/zkoss/reference/component/diagrams/MyJfreeChartEngine.java
• https://github.com/zkoss/zkbooks/blob/master/componentreference/src/main/webapp/diagrams/chart-gantt.zul

You need to find the corresponding jfreechart api to change the label of a pie chart, it could be: * be:

• https://www.jfree.org/jfreechart/javadoc/org/jfree/chart/labels/PieSectionLabelGenerator.html
*
• https://www.jfree.org/jfreechart/javadoc/org/jfree/chart/labels/PieToolTipGenerator.html