Java JFreeChart在JPanel中沒有完全顯示圖表

Question

我一直在試驗JFreeChart以獲得即將推出的項目，並查看它們看起來相當直接的教程。我創建了一個簡單的小程序，要求輸入一些數據並顯示一個3D餅圖。它可以工作，但是在面板中顯示圖表時只能部分顯示圖表。如果您在面板內單擊，則它將增長到顯示面板的大小。我試過在不同的地方設置各種setPreferredSize（），但似乎沒有任何工作。我錯過了什麼？

import java.awt.Dimension; 
import java.awt.EventQueue; 
import javax.swing.JFrame; 
import java.awt.Rectangle; 
import javax.swing.JPanel; 
import javax.swing.border.EtchedBorder; 
import javax.swing.JComponent; 
import javax.swing.JOptionPane; 
import javax.swing.JLabel; 
import javax.swing.JSpinner; 
import javax.swing.JTextField; 
import javax.swing.JButton; 
import org.jfree.chart.ChartFactory; 
import org.jfree.chart.ChartPanel; 
import org.jfree.chart.JFreeChart; 
import org.jfree.chart.plot.PiePlot3D; 
import org.jfree.data.general.DefaultPieDataset; 
import org.jfree.util.Rotation; 
import java.awt.event.ActionListener; 
import java.awt.event.ActionEvent; 
import net.miginfocom.swing.MigLayout; 


@SuppressWarnings("serial") 
public class mWindow extends JFrame{ 

private JPanel pnlDisplay; 
private JPanel panel; 
private JLabel label_1; 
private JLabel label_2; 
private JSpinner spinner; 
private JButton button; 


/** 
* Window Constructor 
*/ 
private mWindow(){ 
    setBounds(new Rectangle(0, 0, 600, 500)); 
    getContentPane().setLayout(new MigLayout("", "[200px:200.00][564px,grow]", "[120px:120.00][308px,grow]")); 

    panel = new JPanel(); 
    panel.setLayout(null); 
    panel.setBorder(new EtchedBorder(EtchedBorder.RAISED, null, null)); 
    getContentPane().add(panel, "cell 0 0,grow"); 

    label_1 = new JLabel("Control Panel"); 
    label_1.setBounds(10, 10, 100, 20); 
    panel.add(label_1); 

    label_2 = new JLabel("Number of Values"); 
    label_2.setBounds(10, 40, 100, 20); 
    panel.add(label_2); 

    spinner = new JSpinner(); 
    spinner.setBounds(120, 40, 40, 20); 
    panel.add(spinner); 

    button = new JButton("Create Pie Chart"); 
    button.addActionListener(new ActionListener() { 
     public void actionPerformed(ActionEvent e) { 
      createPieChart(); 
     } 
    }); 
    button.setBounds(10, 70, 150, 40); 
    panel.add(button); 

    pnlDisplay = new JPanel(); 
    pnlDisplay.setBorder(new EtchedBorder(EtchedBorder.RAISED, null, null)); 
    getContentPane().add(pnlDisplay, "cell 0 1 2 1,grow"); 
    pnlDisplay.setLayout(null); 

} 

private void createPieChart(){ 

    // create the data set 
    // create the chart 
    // put chart in a panel 
    // set default configuration for panel 
    // add panel to our displayPanel 

    int numVal = (int) spinner.getValue(); 
    JTextField label = new JTextField(); 
    JTextField value = new JTextField();   
    DefaultPieDataset dds = new DefaultPieDataset(); 

    final JComponent[] fieldInput = new JComponent[]{ 
      new JLabel("Label Name"), label, 
      new JLabel("Value"), value 
    }; 

    for(int index = 0; index < numVal; index++){ 
     // Display a dialog asking for the Information Needed to add a job 
     int n = JOptionPane.showConfirmDialog(
       this, 
       fieldInput, 
       "Create Data Set " + (index+1), 
       JOptionPane.PLAIN_MESSAGE 
     ); 

     if(n < 0){ 
      JOptionPane.showMessageDialog(this, "No Data Set has been created", 
        "Data Set Add Canceled ", JOptionPane.ERROR_MESSAGE); 
      return; 
     } 

     String Label = label.getText(); 
     int Value = Integer.parseInt(value.getText()); 
     dds.setValue(Label, Value); 
     label.setText(""); 
     value.setText(""); 
    } 

    // Data set ready ~ create the chart 
    JFreeChart chart = ChartFactory.createPieChart3D("Our Pie Chart",   // chart title 
      dds,    // data set 
      true,    // include legend 
      true,    // enable tool tips 
      false);    // use urls 

    PiePlot3D plot = (PiePlot3D) chart.getPlot(); 
    plot.setStartAngle(290);      // angel of first data set 
    plot.setDirection(Rotation.CLOCKWISE);   // rotation of chart 
    plot.setForegroundAlpha(0.2f);     // set alpha transparency 

    // create a panel to track chart changes and set it's default size 
    final ChartPanel chartPanel = new ChartPanel(chart); 
    chartPanel.setPreferredSize(pnlDisplay.getSize()); 


    chartPanel.setBounds(10,10,pnlDisplay.getWidth()-20,pnlDisplay.getHeight()-20); 

    // add our chart to our display panel 
    pnlDisplay.add(chartPanel); 
    pnlDisplay.validate(); 

} 

/** 
* Initializes and Show the GUI 
*/ 
private static void InitalizeAndShowGUI(){ 
    mWindow mainWindow = new mWindow(); 
    mainWindow.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    mainWindow.setTitle("Chart Demo v0.1"); 
    Dimension windowSize = new Dimension(600,700); 
    mainWindow.setMinimumSize(windowSize); 
    mainWindow.setLocation(100, 100); 
    mainWindow.pack(); 
    mainWindow.setVisible(true); 
} 

public static void main(String[] args) { 
    EventQueue.invokeLater(new Runnable() { 
     public void run() { 
      try { 
       InitalizeAndShowGUI(); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     } 
    }); 
} 
} 

Answer 1

添加新圖表組件後，您需要重新繪製它，使之充分地顯現出來：

chartPanel.repaint();