java - JPanelから内部クラスに継承しないことは可能ですか?

Question

おはようございます。の助けを借りて塗りつぶされたグラフィックを拡大するプログラムを書きたいですJSlider。ActPanelとContourが の内部クラスだったときLab4、少なくともJFrame. しかし、Radius を渡して再描画するには大きな問題がありました。内部クラスの使用を控えましたが、それ以上は画面に表示されActPanelませんでした。Contour

ここがコードの最も重要な部分です

class ActPanel extends JPanel implements ChangeListener {

    public Contour cont;

    public ActPanel(Contour contour) {
        super(new FlowLayout());
        cont = contour;

        JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 250, 50);
        slider.addChangeListener(this);

        JButton button = new JButton("display mark");
    }

    public void stateChanged(ChangeEvent e) {

        if (e.getSource() instanceof JSlider) {
            JSlider source = (JSlider)e.getSource();
            if (!source.getValueIsAdjusting()) {
                int R = (int)source.getValue();
                cont.setR(R);
                cont.repaint();
            }
        } 
    } 
}

class Contour extends JPanel {

    private static final int pointCount = 9;

    public void paintComponent(Graphics gfx) {
        super.paintComponent(gfx);
        Graphics2D g = (Graphics2D) gfx;

        GeneralPath fpolygon = new GeneralPath(GeneralPath.WIND_EVEN_ODD, pointCount);
        fpolygon.moveTo(Float.valueOf((float)R+250), Float.valueOf(250.0f));
        fpolygon.lineTo(Float.valueOf(250.0f), Float.valueOf(250.0f));

        //some drawing
    }

    private int R;

    public void setR(int R) {
        this.R = R;
    }

    public int getR() {
        return R;
    }

}

public class Lab4 {

    private static void addComponentsToPane(Container pane) {

        if (!(pane.getLayout() instanceof BorderLayout)) {
             pane.add(new JLabel("Container doesn't use BorderLayout!"));
             return;
        }

        Contour cont = new Contour();

        ActPanel bottom = new ActPanel(cont);
        pane.add(bottom, BorderLayout.PAGE_END);

        cont.setPreferredSize(new Dimension(500,500));
        pane.add(cont, BorderLayout.LINE_END);

    }

    private static void createAndShowGUI() {

        JFrame frame = new JFrame("Lab4");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        addComponentsToPane(frame.getContentPane());

        frame.pack();
        frame.setVisible(true);
   }

   public static void main(String [] arg) {

        SwingUtilities.invokeLater(
             new Runnable() {
                  public void run() {
                       createAndShowGUI();
                  }
             });
        }
   }

そしてフルバージョンです

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.awt.geom.*;

class ActPanel extends JPanel implements ChangeListener {

    public Contour cont;

    public ActPanel(Contour contour) {
         super(new FlowLayout());

         cont = contour;

         JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 250, 50);
         slider.addChangeListener(this);

         JButton button = new JButton("display mark");
    }

    public void stateChanged(ChangeEvent e) {

         if (e.getSource() instanceof JSlider) {
              JSlider source = (JSlider)e.getSource();
              if (!source.getValueIsAdjusting()) {
                   int R = (int)source.getValue();
                   cont.setR(R);
                   cont.repaint();
              }
         } 
    } 
}

class Contour extends JPanel {

    private static final int pointCount = 9;

    public void paintComponent(Graphics gfx) {
         super.paintComponent(gfx);
         double kappa = 0.5522847498;
         Graphics2D g = (Graphics2D) gfx;
         g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,    RenderingHints.VALUE_ANTIALIAS_ON);

         GeneralPath fpolygon = new GeneralPath(GeneralPath.WIND_EVEN_ODD, pointCount);
         fpolygon.moveTo(Float.valueOf((float)R+250), Float.valueOf(250.0f));
         fpolygon.lineTo(Float.valueOf(250.0f), Float.valueOf(250.0f));
         fpolygon.lineTo(Float.valueOf(250.0f), Float.valueOf((float)250-R/2));
         fpolygon.curveTo(
             Float.valueOf((float)((-R/2)*kappa+250)),Float.valueOf((float)(-R/2)+250),
             Float.valueOf((float)(-R/2)+250),Float.valueOf((float)((-R/2)*kappa)+250),
             Float.valueOf((float)-R/2+250), Float.valueOf(250.0f));
             fpolygon.lineTo(Float.valueOf((float)-R+250), Float.valueOf(250.0f));
             fpolygon.lineTo(Float.valueOf((float)-R+250), Float.valueOf((float)R+250));
         fpolygon.lineTo(Float.valueOf(250.0f), Float.valueOf((float)R+250));
         fpolygon.lineTo(Float.valueOf(250.0f), Float.valueOf((float)R/2+250));
         fpolygon.lineTo(Float.valueOf((float)R+250), Float.valueOf(250.0f));
         fpolygon.closePath();

         g.setPaint(Color.red);
         g.fill(fpolygon);
         g.setPaint(Color.black);
         g.draw(fpolygon);
     }

     private int R;

     public void setR(int R) {
         this.R = R;
     }

     public int getR() {
         return R;
     }

 }

 public class Lab4 {

     private static void addComponentsToPane(Container pane) {

     if (!(pane.getLayout() instanceof BorderLayout)) {
          pane.add(new JLabel("Container doesn't use BorderLayout!"));
          return;
     }

     Contour cont = new Contour();

     ActPanel bottom = new ActPanel(cont);
     pane.add(bottom, BorderLayout.PAGE_END);

     JList<Integer> xList = new JList<Integer>(new Integer[] {4,2,5,1,-5,-1,-4});
     pane.add(xList, BorderLayout.LINE_START);

     JPanel yPanel = new JPanel(new FlowLayout(FlowLayout.LEFT));
     yPanel.add(new Label("x\\y"));
     yPanel.add(new JCheckBox("5"));
     yPanel.add(new JCheckBox("1"));
     yPanel.add(new JCheckBox("-5"));
     yPanel.add(new JCheckBox("2"));
     yPanel.add(new JCheckBox("-5"));
     yPanel.add(new JCheckBox("-1"));
     yPanel.add(new JCheckBox("4"));
     pane.add(yPanel, BorderLayout.PAGE_START);

     cont.setPreferredSize(new Dimension(500,500));
     pane.add(cont, BorderLayout.LINE_END);

 }

 private static void createAndShowGUI() {

    JFrame frame = new JFrame("Lab4");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    addComponentsToPane(frame.getContentPane());

    frame.pack();
    frame.setVisible(true);
}

public static void main(String [] arg) {

    SwingUtilities.invokeLater(
         new Runnable() {
             public void run() {
                 createAndShowGUI();
             }
         });
    }
}