Tugas Kedua Pemrograman Grafis

Code Ball
package BounceBall;

 
  import java.awt.*;
  import javax.swing.*;
  import java.awt.event.*;
 
  public class Ball extends JPanel {
    private int delay = 10;

   protected Timer timer = new Timer(delay, new TimerListener());

   public int x = 0; private int y = 0;
   private int radius = 5;
   private int dx = 10;
   private int dy = 10;

   public Ball() {
     timer.start();
   }

   private class TimerListener implements ActionListener {
   
     public void actionPerformed(ActionEvent e) {
       repaint();

     }
   }

   protected void paintComponent(Graphics g) {
     super.paintComponent(g);

     g.setColor(Color.red);
     if (x < radius) dx = Math.abs(dx);
     if (x > getWidth() - radius) dx = -Math.abs(dx);
     if (y < radius) dy = Math.abs(dy);
     if (y > getHeight() - radius) dy = -Math.abs(dy);
     x += dx;
     y += dy;
     g.fillOval(x - radius, y - radius, radius * 2, radius * 2);

    Polygon anu = new Polygon();
    anu.addPoint(0,0);
    anu.addPoint( x - radius, y - radius);
    g.drawPolygon(anu);

   }

   public void suspend() {
     timer.stop();
   }

   public void resume() {
     timer.start();
   }

   public void setDelay(int delay) {
     this.delay = delay;
     timer.setDelay(delay);
   }
 }

Code BallControl
package BounceBall;

  import javax.swing.*;
  import java.awt.event.*;
  import java.awt.*;

  public class BallControl extends JPanel {
    private Ball ball = new Ball();
    private JButton jbtSuspend = new JButton("Stop");
    private JButton jbtResume = new JButton("Lanjutkan");
    private JScrollBar jsbDelay = new JScrollBar();

   public BallControl() {
   
     JPanel panel = new JPanel();
     panel.add(jbtSuspend);
     panel.add(jbtResume);

    
     ball.setBorder(new javax.swing.border.LineBorder(Color.red));
     jsbDelay.setOrientation(JScrollBar.HORIZONTAL);
     ball.setDelay(jsbDelay.getMaximum());
     setLayout(new BorderLayout());
     add(jsbDelay, BorderLayout.NORTH);
     add(ball, BorderLayout.CENTER);
     add(panel, BorderLayout.SOUTH);

   
     jbtSuspend.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
         ball.suspend();
       }
     });
     jbtResume.addActionListener(new ActionListener() {
       public void actionPerformed(ActionEvent e) {
         ball.resume();
       }
     });
     jsbDelay.addAdjustmentListener(new AdjustmentListener() {
       public void adjustmentValueChanged(AdjustmentEvent e) {
         ball.setDelay(jsbDelay.getMaximum() - e.getValue());
       }
     });
   }



 Code BounceBallApp
package BounceBall;

  import java.awt.*;
  import java.awt.event.*;
  import java.applet.*;
  import javax.swing.*;

  public class BounceBallApp extends JApplet {
    public BounceBallApp() {
      add(new BallControl());
    }
 }


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