在JFreeChart中更新PieChart [英] Update PieChart in JFreeChart

问题描述

我已经使用JFreeChart创建了一个PieChart.我一辈子都无法弄清楚图表创建后如何更新.这样做是创建全新图表的唯一方法吗?

I have created a PieChart using JFreeChart. I for the life of my cant figure out how to update the chart once it has been created. Is the only way to do that to create an entirely new chart?

推荐答案

如此处所示，您可以更改图表渲染后.在这种情况下，更新图表的数据 ，PieDataset，然后将监听 view ；在此相关的示例中，按钮的Action更新了CategoryDataset.在MultiplePiePlot中，您可以直接更新饼图视图的外观，如在此处显示.

As shown here, you can alter a chart after it's been rendered. In this case, update the chart's data model, PieDataset, and the listening view will follow; in this related example a button's Action updates a CategoryDataset. In a MultiplePiePlot, you can update the appearance of the pie chart view directly, as shown here.

附录:从 PieChartDemo1 ，重构数据集并添加一个合适的Action，如下所示.

Addendum: Starting from PieChartDemo1, re-factor the dataset and add a suitable Action, as shown below.

private static final DefaultPieDataset dataset = createDataset();
…
public PieChartDemo1(String title) {
    super(title);
    add(createDemoPanel());
    add(new JButton(new AbstractAction("Update") {

        @Override
        public void actionPerformed(ActionEvent e) {
            dataset.setValue("Apple", dataset.getValue("Apple").doubleValue() + 1);
        }
    }), BorderLayout.SOUTH);
}

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