pinballpanel.java

一些JAVA的小程序

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

public class PinBallPanel extends JPanel {
  private Vector balls;   //A vector to hold balls
  private PinBallFire fireButton = new PinBallFire(new Point(PinBallGame.FrameWidth-40, PinBallGame.FrameHeight-70));

  public PinBallPanel(){
      balls = new Vector();
      addMouseListener(new MouseKeeper());
      score = 0;
      scoreLabel = new Label("Score = 0      ");
      targets = new Vector();
      targets.addElement(new Wall(30, 50, 2, 350));
      targets.addElement(new Wall(30, 50, 360, 2));
      targets.addElement(new Wall(390, 50, 2, 380));
      targets.addElement(new Hole(100, 100));
      targets.addElement(new ScorePad(150, 220, 100));
      targets.addElement(new Peg(300, 140, 200));
      targets.addElement(new Spring(120, 350));
      add("North", scoreLabel);
  }

  private int score = 0;
  private Label scoreLabel = new Label("Score = 0");
  private Vector targets;

   public void addScore (int v){
      score = score + v;
      scoreLabel.setText("Score = " + score);
   }

  private class MouseKeeper extends MouseAdapter{

   private PinBallTarget element;

   public void mousePressed (MouseEvent e) { 
      element = null;
      int x = e.getX();
      int y = e.getY();
      if (fireButton.includes(x, y))
         balls.addElement(fireButton.fire(x, y));
      if (x < 40) { //each target occupies a 40 by 40 pixel box
         switch (y / 40) {
            case 2: element = new Hole(0, 0); break;
            case 3: element = new Peg(0, 0, 100); break;
            case 4: element = new Peg(0, 0, 200); break;
            case 5: element = new ScorePad(0, 0, 100); break;
            case 6: element = new ScorePad(0, 0, 200); break;
            case 7: element = new Spring(0, 0); break;
            case 8: element = new Wall(0, 0, 2, 15); break;
	}
	}
	}

   public void mouseReleased (MouseEvent e) {
      int x = e.getX(); // only perform release action if mouse is
      int y = e.getY(); // released on playing surface
      if ((element != null) && (x > 50)) {
         element.moveTo(x, y);
         targets.addElement(element);
         repaint();
      }
   }
   }

  public void run() {
    while (true) {
      moveBalls();
      repaint();
      try {
        Thread.sleep(10);
      } catch(InterruptedException e) {System.exit(0);}
    }
  }

  private void moveBalls() {
    for (int i = 0; i < balls.size(); i++) {
      PinBall theBall = (PinBall) balls.elementAt(i);

      if (theBall.y() < PinBallGame.FrameHeight){
        theBall.move();
        for (int j = 0; j < targets.size(); j++) {
	  PinBallTarget target =
            (PinBallTarget) targets.elementAt(j);
          if (target.intersects(theBall)) target.hitBy(theBall);
        };
      } else {
        balls.removeElement(theBall);
      }
    }
  }

  public void paintComponent(Graphics g) {
    super.paintComponent(g); //clear window
    fireButton.paint(g);
    for (int i = 0; i < balls.size(); i++) {
      Ball aBall = (Ball) balls.elementAt(i);
      aBall.paint(g);
    }
    for (int j = 0; j < targets.size(); j++) {
      PinBallTarget target = (PinBallTarget) targets.elementAt(j);
      target.paint(g);
    }
  }
}