将JFreeChart添加到JPanel

1 回答

• 2

  一堆脱离上下文的代码并不能让你很容易理解你在做什么，但有些像......

  首先，您需要删除以前在UI中显示的任何内容，否则您最终会在屏幕上显示多个图表，这可能会导致其他问题 .

  接下来，在创建图表时，您需要实际添加到屏幕 . 它不会因为您创建新图表而“神奇地”更新

  // import free chart classes
  import java.awt.BorderLayout;
  import java.awt.Dimension;
  import java.awt.EventQueue;
  import java.awt.Graphics;
  import java.awt.Graphics2D;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import javax.swing.JButton;
  import javax.swing.JFrame;
  import javax.swing.JPanel;
  import javax.swing.UIManager;
  import javax.swing.UnsupportedLookAndFeelException;
  
  public class Test {
  
      public static void main(String[] args) {
          new Test();
      }
  
      public Test() {
          EventQueue.invokeLater(new Runnable() {
              @Override
              public void run() {
                  try {
                      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                  } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                      ex.printStackTrace();
                  }
  
                  JFrame frame = new JFrame("Testing");
                  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                  frame.add(new TestPane());
                  frame.pack();
                  frame.setLocationRelativeTo(null);
                  frame.setVisible(true);
              }
          });
      }
  
      public class TestPane extends JPanel {
  
          private JPanel reportingPane;
  
          public TestPane() {
              setLayout(new BorderLayout());
              reportingPane = new JPanel(new BorderLayout());
              JButton btnReporting = new JButton("Reporting");
              btnReporting.addActionListener(new ActionListener() {
                  public void actionPerformed(ActionEvent arg0) {
                      JFreeChart chart = createChart();
                      reportingPane.removeAll();
                      reportingPane.add(new ChartPanel(chart));
                      revalidate();
                      repaint();
                  }
              });
              add(reportingPane);
              add(btnReporting, BorderLayout.SOUTH);
          }
  
          @Override
          public Dimension getPreferredSize() {
              return new Dimension(200, 200);
          }
  
          protected void paintComponent(Graphics g) {
              super.paintComponent(g);
              Graphics2D g2d = (Graphics2D) g.create();
              g2d.dispose();
          }
  
      }
  
      public JFreeChart createChart() {
          XYSeries series = new XYSeries("XYGraph");
          series.add(1, 1);
          series.add(1, 2);
          series.add(2, 1);
          series.add(3, 9);
          series.add(4, 10);
  
          // Add the series to your data set
          XYSeriesCollection dataset = new XYSeriesCollection();
          dataset.addSeries(series);
  
          // Generate the graph
          JFreeChart chart = ChartFactory.createXYLineChart(
                          "XY Chart", // Title
                          "x-axis", // x-axis Label
                          "y-axis", // y-axis Label
                          dataset, // Dataset
                          PlotOrientation.VERTICAL, // Plot Orientation
                          true, // Show Legend
                          true, // Use tooltips
                          false // Configure chart to generate URLs?
          );
  
          return chart;
  
      }
  
  }
  

  至少应该展示基本概念......

  回复于 2024-04-19T15:11:07+08:00