java AWT弹球游戏

 1 package io.guanghe;
 2 
 3 import javax.swing.*;
 4 import java.awt.*;
 5 import java.awt.event.*;
 6 
 7 public class BallGame {
 8     private Frame frame = new Frame("光何弹球");
 9     private final int TABLE_WIDTH = 300;
10     private final int TABLE_HEIGHT = 400;
11     private final int RACKET_WIDTH = 60;
12     private final int RACKET_HEIGHT = 20;
13     private final int BALL_SIZE = 16;
14     private int ballX = 120;
15     private int ballY = 20;
16     private int speedX = 10;
17     private int speedY = 5;
18     private int racketX = 120;
19     private int racketY = 340;
20     private boolean isOver = false;
21     private Timer timer;
22     private class BallCanvas extends Canvas {
23         @Override
24         public void paint(Graphics g) {
25             super.paint(g);
26             if(isOver) {
27                 g.setColor(Color.BLUE);
28                 g.setFont(new Font("Times", Font.BOLD, 30));
29                 g.drawString("游戏结束", 50, 200);
30             } else {
31                 g.setColor(Color.RED);
32                 g.fillOval(ballX, ballY, BALL_SIZE, BALL_SIZE);
33                 g.setColor(Color.PINK);
34                 g.fillRect(racketX, racketY, RACKET_WIDTH, RACKET_HEIGHT);
35             }
36         }
37     }
38     BallCanvas ballCanvas = new BallCanvas();
39     public void init() {
40         frame.addWindowListener(new WindowAdapter() {
41             @Override
42             public void windowClosing(WindowEvent e) {
43                 System.exit(0);
44             }
45         });
46         KeyListener listener = new KeyAdapter() {
47             @Override
48             public void keyPressed(KeyEvent e) {
49                 super.keyPressed(e);
50                 int keyCode = e.getKeyCode();
51                 if(keyCode == KeyEvent.VK_LEFT) {
52                     if(racketX > 0) {
53                         racketX -= 10;
54                     }
55                 } else if(keyCode == KeyEvent.VK_RIGHT) {
56                     if(racketX < (TABLE_WIDTH - RACKET_WIDTH)) {
57                         racketX += 10;
58                     }
59                 }
60             }
61         };
62         frame.addKeyListener(listener);
63         ballCanvas.addKeyListener(listener);
64         ActionListener task = e -> {
65             if(ballX <= 0 || ballX >= (TABLE_WIDTH - BALL_SIZE)) {
66                 speedX = -speedX;
67             }
68             if(ballY <= 0 || (ballY > racketY - BALL_SIZE && ballX > racketX && ballX < racketX + RACKET_WIDTH)) {
69                 speedY = -speedY;
70             }
71             if(ballY > racketY - BALL_SIZE && (ballX < racketX || ballX > racketX + RACKET_WIDTH)) {
72                 timer.stop();
73                 isOver = true;
74             }
75             ballX += speedX;
76             ballY += speedY;
77             ballCanvas.repaint();
78         };
79         timer = new Timer(100, task);
80         timer.start();
81         ballCanvas.setPreferredSize(new Dimension(TABLE_WIDTH, TABLE_HEIGHT));
82         frame.add(ballCanvas);
83         frame.pack();
84         frame.setVisible(true);
85     }
86 
87     public static void main(String[] args) {
88         new BallGame().init();
89     }
90 }