Update PieChart in JFreeChart

Question

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 en

Answer 1

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.

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);
}