《瘋狂Java講義》 練習(xí)游戲

import java.awt.Canvas;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Font;

import java.awt.Frame;

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import java.awt.event.WindowAdapter;

import java.awt.event.WindowEvent;

import java.util.Random;

import javax.swing.Timer;

public class PinBall {

/**

* @param args

*/

//桌面長(zhǎng)寬

private final int TABLE_WIDTH = 300;

private final int TABLE_HEIGHT = 400;

//球拍的垂直位置

private final int RACKET_Y = 340;

//球拍的高度和寬度

private final int RACKET_HEIGHT = 20;

private final int RACKET_WIDTH = 60;

//球大小

private final int BALL_SIZE = 16;

private Frame f = new Frame("PinBall");

Random rand = new Random();

//小球縱向的運(yùn)行速度

private int ySpeed = 10;

private double xyRate = rand.nextDouble() - 0.5;

private int xSpeed = (int)(ySpeed*xyRate*2);

private int ballX = rand.nextInt(200) + 20;

private int ballY = rand.nextInt(10) + 20;

private int racketX = rand.nextInt(200);

private String shape = "";

Timer timer;

private boolean isLose = false;

private MyCanvas tableArea = new MyCanvas();

public void init()

{

tableArea.setPreferredSize(new Dimension(TABLE_WIDTH, TABLE_HEIGHT));

f.add(tableArea);

KeyAdapter keyProcessor = new KeyAdapter() {

public void keyPressed(KeyEvent ke)

{

if( ke.getKeyCode() == KeyEvent.VK_LEFT )

{

if( racketX > 0 )

racketX -= 10;

}

if( ke.getKeyCode() == KeyEvent.VK_RIGHT )

{

if( racketX < TABLE_WIDTH - RACKET_WIDTH )

racketX += 10;

}

}

};

f.addKeyListener(keyProcessor);

tableArea.addKeyListener(keyProcessor);

ActionListener taskPerformer = new ActionListener() {

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

if( ballX <= 0 || ballX >= TABLE_WIDTH-BALL_SIZE )

{

xSpeed = -xSpeed;

}

if( ballY>= RACKET_Y - BALL_SIZE &&

(ballX < racketX || ballX > racketX + RACKET_WIDTH))

{

timer.stop();

isLose = true;

tableArea.repaint();

}

else if( ballY <= 0 ||

(ballY >= RACKET_Y - BALL_SIZE

&& ballX > racketX && ballX <= racketX + RACKET_WIDTH) )

{

ySpeed = -ySpeed;

}

ballY += ySpeed;

ballX += xSpeed;

tableArea.repaint();

}

};

f.addWindowListener(new WindowAdapter() {

public void windowClosing(WindowEvent e)

{

System.exit(0);

}

});

timer = new Timer(100, taskPerformer);

timer.start();

f.pack();

f.setVisible(true);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

new PinBall().init();

}

class MyCanvas extends Canvas

{

public void paint(Graphics g)

{

if( isLose )

{

g.setColor(new Color(255, 0, 0));

g.setFont(new Font("Times", Font.BOLD, 30));

g.drawString("Game Over", 50, 200);

}

else

{

g.setColor(new Color(240, 240, 80));

g.fillOval(ballX, ballY, BALL_SIZE, BALL_SIZE);

g.setColor(new Color(80, 80, 200));

g.fillRect(racketX, RACKET_Y, RACKET_WIDTH, RACKET_HEIGHT);

}

}

}

}

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