java打砖块源码

Java打砖块源码及原理解析

1. 前言

打砖块是一款经典的游戏，通过控制一个板挡住从上方落下的小球，将小球反弹来消除砖块。本文将介绍使用Java编写的打砖块游戏的源码，并解析其原理。

2. 游戏源码

下面是一个简单的Java打砖块游戏源码示例：

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JPanel;
import javax.swing.Timer;

public class Game extends JPanel implements ActionListener, KeyListener {
    private boolean play = false;
    private int score = 0;

    private int totalBricks = 21;

    private Timer timer;
    private int delay = 8;

    private int playerX = 310;

    private int ballposX = 120;
    private int ballposY = 350;
    private int ballXdir = -1;
    private int ballYdir = -2;

    private MapGenerator map;

    public Game() {
        map = new MapGenerator(3, 7);
        addKeyListener(this);
        setFocusable(true);
        setFocusTraversalKeysEnabled(false);
        timer = new Timer(delay, this);
        timer.start();
    }

    public void paint(Graphics g) {
        // 背景
        g.setColor(Color.black);
        g.fillRect(1, 1, 692, 592);

        // 绘制砖块
        map.draw((Graphics2D)g);

        // 绘制边界
        g.setColor(Color.yellow);
        g.fillRect(0, 0, 3, 592);
        g.fillRect(0, 0, 692, 3);
        g.fillRect(691, 0, 3, 592);

        // 绘制得分
        g.setColor(Color.white);
        g.setFont(new Font("serif", Font.BOLD, 25));
        g.drawString("" + score, 590, 30);

        // 绘制板
        g.setColor(Color.green);
        g.fillRect(playerX, 550, 100, 8);

        // 绘制小球
        g.setColor(Color.yellow);
        g.fillOval(ballposX, ballposY, 20, 20);

        if (totalBricks <= 0) {
            play = false;
            ballXdir = 0;
            ballYdir = 0;
            g.setColor(Color.red);
            g.setFont(new Font("serif", Font.BOLD, 30));
            g.drawString("You Win, Score: " + score, 260, 300);

            g.setFont(new Font("serif", Font.BOLD, 20));
            g.drawString("Press Enter to Restart", 230, 350);
        }

        if (ballposY > 570) {
            play = false;
            ballXdir = 0;
            ballYdir = 0;
            g.setColor(Color.red);
            g.setFont(new Font("serif", Font.BOLD, 30));
            g.drawString("Game Over, Score: " + score, 190, 300);

            g.setFont(new Font("serif", Font.BOLD, 20));
            g.drawString("Press Enter to Restart", 230, 350);
        }

        g.dispose();
    }

    public void actionPerformed(ActionEvent e) {
        timer.start();
        if (play) {
            if (new Rectangle(ballposX, ballposY, 20, 20).intersects(new Rectangle(playerX, 550, 100, 8)))
                ballYdir = -ballYdir;

            A: for (int i = 0; i <map.map.length; i++) {
                for (int j = 0; j < map.map[0].length; j++) {
                    if (map.map[i][j] > 0) {
                        int brickX = j * map.brickWidth + 80;
                        int brickY = i * map.brickHeight + 50;
                        int brickWidth = map.brickWidth;
                        int brickHeight = map.brickHeight;

                        Rectangle rect = new Rectangle(brickX, brickY, brickWidth, brickHeight);
                        Rectangle ballRect = new Rectangle(ballposX, ballposY, 20, 20);
                        Rectangle brickRect = rect;

                        if (ballRect.intersects(brickRect)) {
                            map.setBrickValue(0, i, j);
                            totalBricks--;
                            score += 5;

                            if (ballposX + 19 <= brickRect.x || ballposX + 1 >= brickRect.x + brickRect.width)
                                ballXdir = -ballXdir;
                            else
                                ball