JFreeChart更改现有条形图中的数据

我想在一个循环中更改条形图数据，我不知道该怎么做。 我的代码：

DefaultCategoryDataset barChartData = new DefaultCategoryDataset(); barChartData.setValue(0, "Values","1"); barChartData.setValue(0, "Values","2"); barChartData.setValue(0, "Values","3"); JFreeChart barChart = ChartFactory.createBarChart("Proxi", "Sensors", "Value", barChartData, PlotOrientation.VERTICAL, false, true, false); CategoryPlot barchrt = barChart.getCategoryPlot(); barchrt.setRangeGridlinePaint(Color.ORANGE); ChartPanel barPanel = new ChartPanel(barChart); barPanel.setBounds(0, 0, 731, 456); contentPane.add(barPanel); 

Answer 1

更新模型，然后将听取视图 。 要在不阻塞事件派发线程的情况下为更新设置动画，请使用javax.swing.Timer ，如下所示; 根据需要调用stop() 。

经测试：

 import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.EventQueue; import java.awt.event.ActionEvent; import java.util.Random; import javax.swing.AbstractAction; import javax.swing.JButton; import javax.swing.JFrame; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartPanel; import org.jfree.chart.JFreeChart; import org.jfree.chart.plot.PlotOrientation; import org.jfree.data.category.DefaultCategoryDataset; /** * @see https://stackoverflow.com/a/21267585/230513 */ public class Test { private static final String ROW_KEY = "Values"; private static final Random r = new Random(); private void display() { JFrame f = new JFrame("Test"); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); final DefaultCategoryDataset model = new DefaultCategoryDataset(); model.setValue(1, ROW_KEY, "1"); model.setValue(2, ROW_KEY, "2"); model.setValue(3, ROW_KEY, "3"); JFreeChart chart = ChartFactory.createBarChart("Proxi", "Sensors", "Value", model, PlotOrientation.VERTICAL, false, true, false); ChartPanel barPanel = new ChartPanel(chart) { @Override public Dimension getPreferredSize() { return new Dimension(320, 240); } }; f.add(barPanel); f.add(new JButton(new AbstractAction("Update") { @Override public void actionPerformed(ActionEvent e) { model.setValue(r.nextDouble() * 3, ROW_KEY, "2"); } }), BorderLayout.SOUTH); f.pack(); f.setLocationRelativeTo(null); f.setVisible(true); } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { new Test().display(); } }); } }