俄罗斯方块 Java 版

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package ersblockgamedemo;

/**
 *
 * @author jiangnan314
 */
import java.applet.Applet;
import java.applet.AudioClip;
import java.awt.*;
import java.awt.event.*;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.*;
import javax.swing.border.Border;
import javax.swing.border.EtchedBorder;

/**
 * 游戏主类,继承自JFrame类,负责游戏的全局控制。 内含: 1.一个GameCanvas画布类的实例对象,
 * 2.一个保存当前活动块(ErsBlock)实例的对象; 3.一个保存当前控制面板(ControlPanel)实例的对象;
 */
public class ErsBlocksGame extends JFrame {

    /**
     * 每填满一行计多少分
     */
    public final static int PER_LINE_SCORE = 100;
    /**
     * 积多少分以后能升级
     */
    public final static int PER_LEVEL_SCORE = PER_LINE_SCORE * 20;
    /**
     * 最大级数是10级
     */
    public final static int MAX_LEVEL = 10;
    /**
     * 默认级数是2
     */
    public final static int DEFAULT_LEVEL = 2;
    private GameCanvas canvas;
    private ErsBlock block;
    private FileDialog dialog = new FileDialog(this);
    private boolean playing = false;
    private AudioClip audioclip;
    private ControlPanel ctrlPanel;
    private JMenuBar bar = new JMenuBar();
    private JMenu mGame = new JMenu(" 游戏"),
            mControl = new JMenu(" 控制"),
            mWindowStyle = new JMenu("游戏风格"),
            mMusic = new JMenu("设置游戏音乐"),
            mInfo = new JMenu("帮助");
    private JMenuItem miNewGame = new JMenuItem("新游戏"),
            miSetBlockColor = new JMenuItem("设置方块颜色..."),
            miSetBackColor = new JMenuItem("设置背景颜色..."),
            miTurnHarder = new JMenuItem("升高游戏难度"),
            miTurnEasier = new JMenuItem("降低游戏难度"),
            miExit = new JMenuItem("退出"),
            miPlay = new JMenuItem("开始"),
            miPause = new JMenuItem("暂停"),
            miResume = new JMenuItem("恢复"),
            miOpen = new JMenuItem("打开"),
            playMusic = new JMenuItem("播放"),
            stopMusic = new JMenuItem("停止"),
            miStop = new JMenuItem("终止游戏"),
            loopMusic = new JMenuItem("循环"),
            miAuthor = new JMenuItem("关于本游戏");
    private JCheckBoxMenuItem miAsWindows = new JCheckBoxMenuItem("Windows"),
            miAsMotif = new JCheckBoxMenuItem("Motif"),
            miAsMetal = new JCheckBoxMenuItem("Metal", true);

    /**
     * 主游戏类的构造方法
     *
     * @param title String ,窗口标题
     */
    public ErsBlocksGame(String title) {
        super(title);                                          //设置标题
        setSize(328, 405);                                     //设置窗口大小                  
        setLocationRelativeTo(null);                             //设置窗口居中

        creatMenu();
        Container container = getContentPane();
        container.setLayout(new BorderLayout(6, 0));              //设置窗口的布局管理器
        canvas = new GameCanvas(20, 15);                          //新建游戏画布
        ctrlPanel = new ControlPanel(this);                        //新建控制面板
        container.add(canvas, BorderLayout.CENTER);                //左边加上画布
        container.add(ctrlPanel, BorderLayout.EAST);               //右边加上控制面板

        addWindowListener(new WindowAdapter() {                    //注册窗口事件。当点击关闭按钮时,结束游戏,系统退出。
            @Override
            public void windowClosing(WindowEvent we) {
                stopGame();
                System.exit(0);
            }
        });
        addComponentListener(new ComponentAdapter() {
            @Override
            public void componentResized(ComponentEvent ce) {
                canvas.fanning();
            }
        });

        setVisible(true);
        canvas.fanning();


    }

    /**
     * 让游戏复位
     */
    public void reset() {                            //画布复位,控制面板复位
        ctrlPanel.setPlayButtonEnable(true);
        ctrlPanel.setPauseButtonEnable(false);
        ctrlPanel.setPauseButtonLabel(true);
        ctrlPanel.setStopButtonEnable(false);
        ctrlPanel.setTurnLevelDownButtonEnable(true);
        ctrlPanel.setTurnLevelUpButtonEnable(true);
        miPlay.setEnabled(true);
        miPause.setEnabled(false);
        miResume.setEnabled(false);
        miStop.setEnabled(false);
        ctrlPanel.reset();
        canvas.reset();
    }

    /**
     * 判断游戏是否还在进行
     *
     * @return boolean,true -还在运行,false-已经停止
     */
    public boolean isPlaying() {
        return playing;
    }

    /**
     * 得到当前活动的块
     *
     * @return ErsBlock,当前活动块的引用
     */
    public ErsBlock getCurBlock() {
        return block;
    }

    /**
     * 得到当前画布
     *
     * @return GameCanvas,当前画布的引用
     */
    public GameCanvas getCanvas() {
        return canvas;
    }

    /**
     * 开始游戏
     */
    public void playGame() {
        play();
        ctrlPanel.setPlayButtonEnable(false);
        ctrlPanel.setPauseButtonEnable(true);
        ctrlPanel.setPauseButtonLabel(true);
        ctrlPanel.setStopButtonEnable(true);
        ctrlPanel.setTurnLevelDownButtonEnable(false);
        ctrlPanel.setTurnLevelUpButtonEnable(false);
        miPlay.setEnabled(false);
        miPause.setEnabled(true);
        miResume.setEnabled(false);
        miStop.setEnabled(true);
        miTurnHarder.setEnabled(false);
        miTurnEasier.setEnabled(false);
        ctrlPanel.requestFocus();              //设置焦点
    }

    /**
     * 游戏暂停
     */
    public void pauseGame() {
        if (block != null) {
            block.pauseMove();
        }
        ctrlPanel.setPlayButtonEnable(false);
        ctrlPanel.setPauseButtonLabel(false);
        ctrlPanel.setStopButtonEnable(true);
        miPlay.setEnabled(false);
        miPause.setEnabled(false);
        miResume.setEnabled(true);
        miStop.setEnabled(true);
    }

    /**
     * 让暂停中的游戏继续
     */
    public void resumeGame() {
        if (block != null) {
            block.resumeMove();
        }
        ctrlPanel.setPlayButtonEnable(false);
        ctrlPanel.setPauseButtonEnable(true);
        ctrlPanel.setPauseButtonLabel(true);
        miPause.setEnabled(true);
        miResume.setEnabled(false);
        ctrlPanel.requestFocus();
    }

    /**
     * 用户停止游戏
     */
    public void stopGame() {
        playing = false;
        if (block != null) {
            block.stopMove();
        }
        ctrlPanel.setPlayButtonEnable(true);
        ctrlPanel.setPauseButtonEnable(false);
        ctrlPanel.setPauseButtonLabel(true);
        ctrlPanel.setStopButtonEnable(false);
        ctrlPanel.setTurnLevelDownButtonEnable(true);
        ctrlPanel.setTurnLevelUpButtonEnable(true);
        miPlay.setEnabled(true);
        miPause.setEnabled(false);
        miResume.setEnabled(false);
        miStop.setEnabled(false);
        miTurnHarder.setEnabled(true);
        miTurnEasier.setEnabled(true);
    }

    public AudioClip getAudioClip() {
        return audioclip;
    }

    public void setAudioClip(AudioClip clip) {
        this.audioclip = clip;
    }

    public void playAudio() {
        if (audioclip != null) {
            audioclip.play();
        }
    }

    public void loop() {
        if (audioclip != null) {
            loop();
        }
    }

    public void stop() {
        if (audioclip != null) {
            stop();
        }
    }

    /**
     * 得到游戏者设置的难度
     *
     * @return int ,游戏难度1-MAX_LEVEL
     */
    public int getLevel() {
        return ctrlPanel.getLevel();
    }

    /**
     * 用户设置游戏难度
     *
     * @param level int ,游戏难度1-MAX_LEVEL
     */
    public void setLevel(int level) {
        if (level < 11 && level > 0) {
            ctrlPanel.setLevel(level);
        }
    }

    /**
     * 得到游戏积分
     *
     * @return int,积分
     */
    public int getScore() {
        if (canvas != null) {
            return canvas.getScore();
        }
        return 0;
    }

    /**
     * 得到自上次升级以来的游戏积分,升级以后,此积分清零
     *
     * @return int,积分
     */
    public int getScoreForLevelUpdate() {
        if (canvas != null) {
            return canvas.getScoreForLevelUpdate();
        }
        return 0;
    }

    /**
     * 当积分累积到一定数值时,升一次级
     *
     * @return Boolean,true-update succeed,false-update fail
     */
    public boolean levelUpdate() {
        int curLevel = getLevel();
        if (curLevel < MAX_LEVEL) {
            setLevel(curLevel + 1);
            canvas.resetScoreForLevelUpdate();
            return true;
        }
        return false;
    }

    /**
     * 游戏开始
     */
    private void play() {
        reset();
        playing = true;
        Thread thread = new Thread(new Game());
        thread.start();
    }

    /**
     * 报告游戏结束了
     */
    private void reportGameOver() {
        new gameOverDialog(this, "俄罗斯方块", "游戏结束,您的得分为" + canvas.getScore());
    }

    /**
     * 建立并设置窗口菜单
     */
    private void creatMenu() {
        bar.add(mGame);
        bar.add(mControl);
        bar.add(mWindowStyle);
        bar.add(mMusic);
        bar.add(mInfo);
        mGame.add(miNewGame);
        mGame.addSeparator();
        mGame.add(miSetBlockColor);
        mGame.add(miSetBackColor);
        mGame.addSeparator();
        mGame.add(miTurnHarder);
        mGame.add(miTurnEasier);
        mGame.addSeparator();
        mGame.add(miExit);
        mControl.add(miPlay);
        miPlay.setEnabled(true);
        mControl.add(miPause);
        miPause.setEnabled(false);
        mControl.add(miResume);
        miResume.setEnabled(false);
        mControl.add(miStop);
        miStop.setEnabled(false);
        mWindowStyle.add(miAsWindows);
        mWindowStyle.add(miAsMotif);
        mWindowStyle.add(miAsMetal);
        mMusic.add(miOpen);
        mMusic.add(playMusic);
        mMusic.add(stopMusic);
        mMusic.add(loopMusic);
        mInfo.add(miAuthor);
        setJMenuBar(bar);

        miPause.setAccelerator(KeyStroke.getKeyStroke(
                KeyEvent.VK_P, KeyEvent.CTRL_MASK));
        miResume.setAccelerator(KeyStroke.getKeyStroke(
                KeyEvent.VK_R, KeyEvent.CTRL_MASK));

        miNewGame.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                stopGame();
                reset();
                setLevel(DEFAULT_LEVEL);
            }
        });
        miSetBlockColor.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                Color newFrontColor =
                        JColorChooser.showDialog(ErsBlocksGame.this, "设置方块颜色", canvas.getBlockColor());
                if (newFrontColor != null) {
                    canvas.setBlockColor(newFrontColor);
                }
            }
        });
        miSetBackColor.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                Color newBackColor =
                        JColorChooser.showDialog(ErsBlocksGame.this, "设置背景颜色", canvas.getBackgroundColor());
                if (newBackColor != null) {
                    canvas.setBackgroundColor(newBackColor);
                }
            }
        });
        miAuthor.addActionListener(new ActionListener() {                        //定义菜单栏"关于"的功能,弹出确认框。
            @Override
            public void actionPerformed(ActionEvent e) {
                JOptionPane.showMessageDialog(null, "© Copyright 姜楠-张卓\n" + "  All Rights Reserved.", "关于俄罗斯方块 - 2013", 1);
            }
        });
        miTurnHarder.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                int curLevel = getLevel();
                if (!playing && curLevel < MAX_LEVEL) {
                    setLevel(curLevel + 1);
                }
            }
        });
        miTurnEasier.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                int curLevel = getLevel();
                if (!playing && curLevel > 1) {
                    setLevel(curLevel - 1);
                }
            }
        });
        miExit.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                System.exit(0);
            }
        });
        miPlay.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                playGame();
            }
        });
        miPause.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                pauseGame();
            }
        });
        miResume.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                resumeGame();
            }
        });
        miStop.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                stopGame();
            }
        });
        miOpen.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                dialog.setVisible(true);
                if (dialog.getFile() != null) {
                    String filename = dialog.getDirectory() + dialog.getFile();
                    try {
                        setAudioClip(Applet.newAudioClip((new java.io.File(filename)).toURI().toURL()));
                        playAudio();
                    } catch (Exception ex) {
                        ex.printStackTrace();
                    }
                }
            }
        });
        playMusic.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                playAudio();
                playMusic.setEnabled(false);
                stopMusic.setEnabled(true);
            }
        });
        stopMusic.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                stop();
            }
        });
        loopMusic.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                loop();
            }
        });
        miAsWindows.addActionListener(new ActionListener() {                    //改变游戏风格,Windows风格,motif风格,metal风格
            @Override
            public void actionPerformed(ActionEvent ae) {
                String plaf = "com.sun.java.swing.plaf.windows.WindowsLookAndFeel";
                setWindowStyle(plaf);
                canvas.fanning();                                               //以新的界面风格的重新绘制画布和控制面板
                ctrlPanel.fanning();
                miAsWindows.setState(true);                                     //
                miAsMetal.setState(false);
                miAsMotif.setState(false);
            }
        });
        miAsMotif.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String plaf = "com.sun.java.swing.plaf.motif.MotifLookAndFeel";
                setWindowStyle(plaf);
                canvas.fanning();
                ctrlPanel.fanning();
                miAsWindows.setState(false);
                miAsMetal.setState(false);
                miAsMotif.setState(true);
            }
        });
        miAsMetal.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                String plaf = "javax.swing.plaf.metal.MetalLookAndFeel";
                setWindowStyle(plaf);
                canvas.fanning();
                ctrlPanel.fanning();
                miAsWindows.setState(false);
                miAsMetal.setState(true);
                miAsMotif.setState(false);
            }
        });


    }

    /**
     * 根据字串设置窗口外观
     *
     * @param plaf String,窗口外观的描述
     */
    private void setWindowStyle(String plaf) {
        try {
            UIManager.setLookAndFeel(plaf);
            SwingUtilities.updateComponentTreeUI(this);
        } catch (Exception e) {
        }
    }

    /**
     * 一轮游戏过程,实现了Runnable接口 一轮游戏是一个大循环,在这个循环中,每隔100毫秒, 检查游戏中的当前块是否已经到底了,如果没有,
     * 就继续等待。如果到底了,就看有没有全填满的行, 如果有就删除它,并为游戏者加分,同时随机产生一个 新的当前块人 让它自动落下。
     * 当新产生一个块时,先检查画布最顶上的一行是否已经 被占了,如果是,可以判断Game Over 了。
     */
    private class Game implements Runnable {

        @Override
        public void run() {
            int col = (int) (Math.random() * (canvas.getCols() - 3));
            int style = ErsBlock.STYLES[ (int) (Math.random() * 7)][(int) (Math.random() * 4)];

            while (playing) {
                if (block != null) {   //第一次循环时,block为空
                    if (block.isAlive()) {
                        try {
                            Thread.currentThread().sleep(500);
                        } catch (InterruptedException ie) {
                            ie.printStackTrace();
                        }
                        continue;
                    }
                }

                checkFullLine();    //检查是否有全填满的行

                if (isGameOver()) {
                    reportGameOver();
                    miPlay.setEnabled(true);
                    miPause.setEnabled(false);
                    miResume.setEnabled(false);
                    miStop.setEnabled(false);
                    ctrlPanel.setPlayButtonEnable(true);
                    ctrlPanel.setPauseButtonLabel(false);
                    ctrlPanel.setStopButtonEnable(false);
                    return;
                }

                block = new ErsBlock(style, -1, col, getLevel(), canvas);
                block.start();

                col = (int) (Math.random() * (canvas.getCols() - 3));
                style = ErsBlock.STYLES[ (int) (Math.random() * 7)][(int) (Math.random() * 4)];

                ctrlPanel.setTipStyle(style);
            }
        }

        //检查画布中是否有全填满的行,如果有就删之
        public void checkFullLine() {
            for (int i = 0; i < canvas.getRows(); i++) {
                int row = -1;
                boolean fullLineColorBox = true;
                for (int j = 0; j < canvas.getCols(); j++) {
                    if (!canvas.getBox(i, j).isColorBox()) {
                        fullLineColorBox = false;
                        break;
                    }
                }
                if (fullLineColorBox) {
                    row = i--;
                    canvas.removeLine(row);
                }
            }
        }

        //根据最顶行是否被占,判断游戏是否已经结束了
        //@return boolean ,true-游戏结束了,false-游戏未结束
        private boolean isGameOver() {
            for (int i = 0; i < canvas.getCols(); i++) {
                ErsBox box = canvas.getBox(0, i);
                if (box.isColorBox()) {
                    return true;
                }
            }
            return false;
        }
    }

    /**
     * 定义GameOver对话框。
     */
    private class gameOverDialog extends JDialog implements ActionListener {

        private JButton againButton, exitButton;
        private Border border = new EtchedBorder(EtchedBorder.RAISED, Color.white, new Color(148, 145, 140));

        public gameOverDialog(JFrame parent, String title, String message) {
            super(parent, title, true);
            if (parent != null) {
                setSize(240, 120);
                this.setLocationRelativeTo(parent);
                JPanel messagePanel = new JPanel();
                messagePanel.add(new JLabel(message));
                messagePanel.setBorder(border);
                Container container = this.getContentPane();
                container.setLayout(new GridLayout(2, 0, 0, 10));
                container.add(messagePanel);
                JPanel choosePanel = new JPanel();
                choosePanel.setLayout(new GridLayout(0, 2, 4, 0));
                container.add(choosePanel);
                againButton = new JButton("再玩一局");
                exitButton = new JButton("退出游戏");
                choosePanel.add(new JPanel().add(againButton));
                choosePanel.add(new JPanel().add(exitButton));
                choosePanel.setBorder(border);
            }
            againButton.addActionListener(this);
            exitButton.addActionListener(this);
            this.setVisible(true);
        }

        @Override
        public void actionPerformed(ActionEvent e) {
            if (e.getSource() == againButton) {
                this.setVisible(false);
                reset();
            } else if (e.getSource() == exitButton) {
                stopGame();
                System.exit(0);

            }
        }
    }

    /**
     * 程序入口函数
     *
     * @param args String[],附带的命令行参数
     */
    public static void main(String[] args) {
        new ErsBlocksGame("俄罗斯方块:ZJUT-CS&T");
    }
}

/**
 * 画布类,内有<行数>*<列数> 个方格类实例。 继承自JPanel类。 ErsBlock线程类动态改变画布类的方格颜色,画布类通过
 * 检查方格颜色来体现ErsBlock块的移动情况。
 */
class GameCanvas extends JPanel {

    private Color backColor = Color.LIGHT_GRAY, frontColor = Color.orange;
    private int rows, cols, score = 0, scoreForLevelUpdate = 0;
    private ErsBox[][] boxes;
    private int boxWidth, boxHeight;

    /**
     * 画布类的构造函数
     *
     * @param rows int,画布的行数
     * @param cols int,画布的列数 行数和列数决定着画布拥有方格的数目
     */
    public GameCanvas(int rows, int cols) {
        this.rows = rows;
        this.cols = cols;

        boxes = new ErsBox[rows][cols];
        for (int i = 0; i < boxes.length; i++) {
            for (int j = 0; j < boxes[i].length; j++) {
                boxes[i][j] = new ErsBox(false);
            }
        }

        setBorder(new EtchedBorder(EtchedBorder.RAISED, Color.white, new Color(148, 145, 140)));
    }

    /**
     * 画布类的构造函数
     *
     * @param rows
     * @param cols
     * @param backColor
     * @param frontColor
     */
    public GameCanvas(int rows, int cols,
            Color backColor, Color frontColor) {
        this(rows, cols);
        this.backColor = backColor;
        this.frontColor = frontColor;
    }

    /**
     * 设置游戏背景色彩
     *
     * @param backColor Color,背景色彩
     */
    public void setBackgroundColor(Color backColor) {
        this.backColor = backColor;
    }

    /**
     * 取得游戏背景色彩
     *
     * @return Color ,背景色彩
     */
    public Color getBackgroundColor() {
        return backColor;
    }

    /**
     * 设置游戏方块颜色
     *
     * @param frontColor Color,方块颜色
     */
    public void setBlockColor(Color frontColor) {
        this.frontColor = frontColor;
    }

    /**
     * 取得游戏方块色彩
     *
     * @return Color,方块颜色
     */
    public Color getBlockColor() {
        return frontColor;
    }

    /**
     * 取得画布中方格的列数
     *
     * @return
     */
    public int getRows() {
        return rows;
    }

    /**
     * 取得画布中方格的行数
     *
     * @return int,方格的行数
     */
    public int getCols() {
        return cols;
    }

    /**
     * 取得游戏成绩
     *
     * @return int, 分数
     */
    public int getScore() {
        return score;
    }

    /**
     * 取得自上一次升级后的积分
     *
     * @return int ,上一次升级后的积分
     */
    public int getScoreForLevelUpdate() {
        return scoreForLevelUpdate;
    }

    /**
     * 升级后,将上一次升级以来的积分清零
     */
    public void resetScoreForLevelUpdate() {
        scoreForLevelUpdate -= ErsBlocksGame.PER_LEVEL_SCORE;
    }

    /**
     * 得到某一行某一列的方格引用
     *
     * @return row int ,要引用的方格所在的行
     * @param col int, 要引用的方格所在的行
     * @return ErsBox,在row行col列的方格的引用
     */
    public ErsBox getBox(int row, int col) {
        if (row < 0 || row > boxes.length - 1 || col < 0 || col > boxes[0].length - 1) {
            return null;
        }
        return (boxes[row][col]);
    }

    /**
     * 覆盖JComponent类的函数,画组件。
     *
     * @param g 图形设备环境
     */
    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);

        g.setColor(frontColor);
        for (int i = 0; i < boxes.length; i++) {
            for (int j = 0; j < boxes[i].length; j++) {
                g.setColor(boxes[i][j].isColorBox() ? frontColor : backColor);
                g.fill3DRect(j * boxWidth, i * boxHeight,
                        boxWidth, boxHeight, true);
            }
        }
    }

    /**
     * 根据窗口大小,自动调节方格的尺寸
     */
    public void fanning() {
        boxWidth = getSize().width / cols;
        boxHeight = getSize().height / rows;
    }

    /**
     * 当一行被游戏者叠满后,将此行清除,并为游戏者加分
     *
     * @param row int,要清除的行,是由ErsBoxesGame类计算的
     */
    public synchronized void removeLine(int row) {
        for (int i = row; i > 0; i--) {
            for (int j = 0; j < cols; j++) {
                boxes[i][j] = (ErsBox) boxes[i - 1][j].clone();                 //将上一行的方块颜色克隆下来,
            }                                                                   //即消去一行方块
        }

        score += ErsBlocksGame.PER_LEVEL_SCORE;
        scoreForLevelUpdate += ErsBlocksGame.PER_LEVEL_SCORE;
        repaint();
    }

    /**
     * 重置画布,置积分为零
     */
    public void reset() {
        score = 0;
        scoreForLevelUpdate = 0;
        for (int i = 0; i < boxes.length; i++) {
            for (int j = 0; j < boxes[i].length; j++) {
                boxes[i][j].setColor(false);
            }
        }

        repaint();
    }
}

/**
 * 方格类,是组成块的基本元素,用自己的颜色来表示块的外观
 */
class ErsBox implements Cloneable {

    private boolean isColor;
    private Dimension size = new Dimension();

    /**
     * 方格类的构造函数,
     *
     * @param isColor 是不是用前景色来为此方格着色 true前景色,false 用背景色
     */
    public ErsBox(boolean isColor) {
        this.isColor = isColor;
    }

    /**
     * 此方格是不是用前景色表现
     *
     * @return boolean ,true用前景色表现,false 用背景色表现
     */
    public boolean isColorBox() {
        return isColor;
    }

    /**
     * 设置方格的颜色,
     *
     * @param isColor boolean ,true用前景色表现,false 用背景色表现
     */
    public void setColor(boolean isColor) {
        this.isColor = isColor;
    }

    /**
     * 得到此方格的尺寸
     *
     * @return Dimension ,方格的尺寸
     */
    public Dimension getSize() {
        return size;
    }

    /**
     * 设置方格的尺寸,
     *
     * @param size Dimension ,方格的尺寸
     */
    public void setSize(Dimension size) {
        this.size = size;
    }

    /**
     * 覆盖Object的Object clone(),实现克隆
     *
     * @return Object,克隆的结果
     */
    @Override
    public Object clone() {
        Object cloned = null;
        try {
            cloned = super.clone();
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        return cloned;
    }
}

/**
 * 块类,继承自线程类(Thread) 由4 × 4个方块(ErsBox)构成一个方块, 控制块的移动·下落·变形等
 */
class ErsBlock extends Thread {

    /**
     * 一个块占的行数是4行
     */
    public final static int BOXES_ROWS = 4;
    /**
     * 一个块占的列数是4列
     */
    public final static int BOXES_COLS = 4;
    /**
     * 让升级变化平滑的因子,避免最后几级之间的速度相差近一倍
     */
    public final static int LEVEL_FLATNESS_GENE = 3;
    /**
     * 相近的两级之间,块每下落一行的时间差别为多少(毫秒)
     */
    public final static int BETWEEN_LEVELS_DEGRESS_TIME = 50;
    /**
     * 方块的样式数目为7
     */
    public final static int BLOCK_KIND_NUMBER = 7;
    /**
     * 每一个样式的方块的反转状态种类为4
     */
    public final static int BLOCK_STATUS_NUMBER = 4;
    /**
     * 分别对应7种模型的28种状态
     */
    public final static int[][] STYLES = { //共28种状态
        {0x0f00, 0x4444, 0x0f00, 0x4444}, //长条型的四种状态
        {0x04e0, 0x0464, 0x00e4, 0x04c4}, //T型的四种状态
        {0x4620, 0x6c00, 0x4620, 0x6c00}, //反Z型的四种状态
        {0x2640, 0xc600, 0x2640, 0xc600}, //Z型的四种状态
        {0x6220, 0x1700, 0x2230, 0x0740}, //7型的四种状态
        {0x6440, 0x0e20, 0x44c0, 0x8e00}, //反7型的四种状态   
        {0x0660, 0x0660, 0x0660, 0x0660}, //方块的四种状态
    };
    private GameCanvas canvas;
    private ErsBox[][] boxes = new ErsBox[BOXES_ROWS][BOXES_COLS];
    private int style, y, x, level;
    private boolean pausing = false, moving = true;

    /**
     * 构造函数,产生一个特定的块
     *
     * @param style 块的样式,对应STYLES的28个值中的一个
     * @param y 起始位置,左上角在canvas中的坐标行
     * @param x 起始位置,左上角在canvas中的坐标lie
     * @param level 游戏等级,控制块的下落速度
     * @param canvas 画板
     */
    public ErsBlock(int style, int y, int x, int level, GameCanvas canvas) {
        this.style = style;
        this.y = y;
        this.x = x;
        this.level = level;
        this.canvas = canvas;

        int key = 0x8000;
        for (int i = 0; i < boxes.length; i++) {
            for (int j = 0; j < boxes[i].length; j++) {
                boolean isColor = ((style & key) != 0);
                boxes[i][j] = new ErsBox(isColor);
                key >>= 1;
            }
        }

        display();
    }

    /**
     * 线程类的run()函数覆盖,下落块,直到块不能再下落
     */
    @Override
    public void run() {
        while (moving) {
            try {
                sleep(BETWEEN_LEVELS_DEGRESS_TIME
                        * (ErsBlocksGame.MAX_LEVEL - level + LEVEL_FLATNESS_GENE));
            } catch (InterruptedException ie) {
                ie.printStackTrace();
            }
            //后边的moving是表示在等待的100毫秒间,moving没有被改变
            if (!pausing) {
                moving = (moveTo(y + 1, x) && moving);
            }
        }
    }

    /**
     * 块向左移动一格
     */
    public void moveLeft() {
        moveTo(y, x - 1);
    }

    /**
     * 块向右移动一格
     */
    public void moveRight() {
        moveTo(y, x + 1);
    }

    /**
     * 块向下移动一格
     */
    public void moveDown() {
        moveTo(y + 1, x);
    }

    /**
     * 块变型
     */
    public void turnNext() {
        for (int i = 0; i < BLOCK_KIND_NUMBER; i++) {
            for (int j = 0; j < BLOCK_STATUS_NUMBER; j++) {
                if (STYLES[i][j] == style) {
                    int newStyle = STYLES[i][(j + 1) % BLOCK_STATUS_NUMBER];
                    turnTo(newStyle);
                    return;
                }
            }
        }
    }

    public void startMove() {
        pausing = false;
        moving = true;
    }

    /**
     * 暂停块的下落,对应游戏暂停
     */
    public void pauseMove() {
        pausing = true;
        //   moving = false;
    }

    /**
     * 继续块的下落,对应游戏继续
     */
    public void resumeMove() {
        pausing = false;
        moving = true;
    }

    /**
     * 停止块的下落,对应游戏停止
     */
    public void stopMove() {
        pausing = false;
        moving = false;
    }

    /**
     * 将当前块从画布的对应位置移除,要等到下次重画画布时才能反映出来
     */
    private void erase() {
        for (int i = 0; i < boxes.length; i++) {
            for (int j = 0; j < boxes[i].length; j++) {
                if (boxes[i][j].isColorBox()) {
                    ErsBox box = canvas.getBox(i + y, j + x);
                    if (box == null) {
                        continue;
                    }
                    box.setColor(false);
                }
            }
        }
    }

    /**
     * 让当前块放置在画布的对因位置上,要等到下次重画画布时才能看见
     */
    private void display() {
        for (int i = 0; i < boxes.length; i++) {
            for (int j = 0; j < boxes[i].length; j++) {
                if (boxes[i][j].isColorBox()) {
                    ErsBox box = canvas.getBox(i + y, j + x);
                    if (box == null) {
                        continue;
                    }
                    box.setColor(true);
                }
            }
        }
    }

    /**
     * 当前块能否移动到newRow/newCol 所指定的位置
     *
     * @param newRow int,目的地所在行
     * @param newCol int,目的地所在列
     * @return boolean,true-能移动,false-不能移动
     */
    public boolean isMoveAble(int newRow, int newCol) {
        erase();
        for (int i = 0; i < boxes.length; i++) {
            for (int j = 0; j < boxes[i].length; j++) {
                if (boxes[i][j].isColorBox()) {
                    ErsBox box = canvas.getBox(i + newRow, j + newCol);
                    if (box == null || (box.isColorBox())) {
                        display();
                        return false;
                    }
                }
            }
        }
        display();
        return true;
    }

    /**
     * 将当前块移动到newRow/newCol 所指定的位置
     *
     * @param newRow int,目的地所在行
     * @param newCol int,目的地所在列
     * @return boolean,true-移动成功,false-移动失败
     */
    private synchronized boolean moveTo(int newRow, int newCol) {
        if (!isMoveAble(newRow, newCol) || !moving) {
            return false;
        }

        erase();
        y = newRow;
        x = newCol;

        display();
        canvas.repaint();

        return true;
    }

    /**
     * 当前块能否变成newStyle所指定的块样式,主要是考虑 边界以及被其他块挡住,不能移动的情况
     *
     * @param newSytle int,希望改变的块样式,对应STYLES的28个值中的一个
     * @return boolean,true-能改变,false-不能改变
     */
    private boolean isTurnAble(int newStyle) {
        int key = 0x8000;
        erase();
        for (int i = 0; i < boxes.length; i++) {
            for (int j = 0; j < boxes[i].length; j++) {
                if ((newStyle & key) != 0) {
                    ErsBox box = canvas.getBox(i + y, j + x);
                    if (box == null || (box.isColorBox())) {
                        display();
                        return false;
                    }
                }
                key >>= 1;
            }
        }
        display();
        return true;
    }

    /**
     * 将当前块变成newStyle所指定的块样式
     *
     * @param newStyle int,希望改变的块样式,对应STYLES的28个值中的一个
     * @return true-改变成功,false-改变失败
     */
    private boolean turnTo(int newStyle) {
        if (!isTurnAble(newStyle) || !moving) {
            return false;
        }

        erase();
        int key = 0x8000;
        for (int i = 0; i < boxes.length; i++) {
            for (int j = 0; j < boxes[i].length; j++) {
                boolean isColor = ((newStyle & key) != 0);
                boxes[i][j].setColor(isColor);
                key >>= 1;
            }
        }
        style = newStyle;

        display();
        canvas.repaint();

        return true;
    }
}

/**
 * 控制面板类,继承自JPanel。 上边安放预显窗口,等级,得分,控制按钮 主要用来控制游戏进程。
 */
class ControlPanel extends JPanel {

    private JTextField tfLevel = new JTextField("" + ErsBlocksGame.DEFAULT_LEVEL),
            tfScore = new JTextField(" 0"),
            tfTime = new JTextField(" ");
    private JButton btPlay = new JButton(" 开始"),
            btPause = new JButton(" 暂停"),
            btStop = new JButton("终止游戏"),
            btTurnLevelUp = new JButton(" 增加难度"),
            btTurnLevelDown = new JButton(" 降低难度");
    private JPanel plTip = new JPanel(new BorderLayout());
    private TipPanel plTipBlock = new TipPanel();
    private JPanel plInfo = new JPanel(new GridLayout(4, 1));
    private JPanel plButton = new JPanel(new GridLayout(6, 1));
    private Timer timer;
    private ErsBlocksGame game;
    private Border border = new EtchedBorder(EtchedBorder.RAISED, Color.white, new Color(148, 145, 140));

    /**
     * 控制面板类的构造函数
     *
     * @param game ErsBlocksGame,ErsBlocksGame 类的一个实例引用 方便直接控制ErsBlocksGame类的行为。
     */
    public ControlPanel(final ErsBlocksGame game) {
        setLayout(new GridLayout(3, 1, 0, 2));
        this.game = game;

        plTip.add(new JLabel(" 下一个方块"), BorderLayout.NORTH);               //添加组件
        plTip.add(plTipBlock);
        plTip.setBorder(border);

        plInfo.add(new JLabel(" 难度系数"));
        plInfo.add(tfLevel);
        plInfo.add(new JLabel(" 得分"));
        plInfo.add(tfScore);
        plInfo.setBorder(border);

        plButton.add(btPlay);
        btPlay.setEnabled(true);
        plButton.add(btPause);
        btPause.setEnabled(false);
        plButton.add(btStop);
        btStop.setEnabled(false);
        plButton.add(btTurnLevelUp);
        plButton.add(btTurnLevelDown);
        plButton.add(tfTime);
        plButton.setBorder(border);

        tfLevel.setEditable(false);
        tfScore.setEditable(false);
        tfTime.setEditable(false);

        add(plTip);
        add(plInfo);
        add(plButton);

        addKeyListener(new KeyAdapter() {
            @Override
            public void keyPressed(KeyEvent ke) {
                if (!game.isPlaying()) {
                    return;
                }

                ErsBlock block = game.getCurBlock();
                switch (ke.getKeyCode()) {
                    case KeyEvent.VK_DOWN:
                        block.moveDown();
                        break;
                    case KeyEvent.VK_LEFT:
                        block.moveLeft();
                        break;
                    case KeyEvent.VK_RIGHT:
                        block.moveRight();
                        break;
                    case KeyEvent.VK_UP:
                        block.turnNext();
                        break;
                    default:
                        break;
                }
            }
        });

        btPlay.addActionListener(new ActionListener() {                         //开始游戏
            @Override
            public void actionPerformed(ActionEvent ae) {
                game.playGame();
            }
        });
        btPause.addActionListener(new ActionListener() {                        //暂停游戏
            @Override
            public void actionPerformed(ActionEvent ae) {
                if (btPause.getText().equals(" 暂停")) {
                    game.pauseGame();
                } else {
                    game.resumeGame();
                }
            }
        });
        btStop.addActionListener(new ActionListener() {                         //停止游戏
            @Override
            public void actionPerformed(ActionEvent ae) {
                game.stopGame();
            }
        });
        btTurnLevelUp.addActionListener(new ActionListener() {                  //升高难度
            @Override
            public void actionPerformed(ActionEvent ae) {
                try {
                    int level = Integer.parseInt(tfLevel.getText());
                    if (level < ErsBlocksGame.MAX_LEVEL) {
                        tfLevel.setText("" + (level + 1));
                    }
                } catch (NumberFormatException e) {
                }
                requestFocus();
            }
        });
        btTurnLevelDown.addActionListener(new ActionListener() {                //降低游戏难度
            @Override
            public void actionPerformed(ActionEvent ae) {
                try {
                    int level = Integer.parseInt(tfLevel.getText());
                    if (level > 1) {
                        tfLevel.setText("" + (level - 1));
                    }
                } catch (NumberFormatException e) {
                }
                requestFocus();
            }
        });

        addComponentListener(new ComponentAdapter() {
            @Override
            public void componentResized(ComponentEvent ce) {
                plTipBlock.fanning();
            }
        });

        timer = new Timer(1000, new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                DateFormat format = new SimpleDateFormat("时间:HH:mm:ss");      //系统获得时间
                Date date = new Date();
                tfTime.setText(format.format(date));

                tfScore.setText("" + game.getScore());
                int ScoreForLevelUpdate = //判断当前分数是否能升级
                        game.getScoreForLevelUpdate();
                if (ScoreForLevelUpdate >= ErsBlocksGame.PER_LEVEL_SCORE
                        && ScoreForLevelUpdate > 0) {
                    game.levelUpdate();
                }
            }
        });
        timer.start();
    }

    /**
     * 设置预显窗口的样式
     *
     * @param style int,对应ErsBlock类的STYLES中的28个值
     */
    public void setTipStyle(int style) {
        plTipBlock.setStyle(style);
    }

    /**
     * 取得用户设置的游戏等级。
     *
     * @return int ,难度等级,1-ErsBlocksGame.MAX_LEVEL
     */
    public int getLevel() {
        int level = 0;
        try {
            level = Integer.parseInt(tfLevel.getText());
        } catch (NumberFormatException e) {
        }
        return level;
    }

    /**
     * 让用户修改游戏难度等级。
     *
     * @param level 修改后的游戏难度等级
     */
    public void setLevel(int level) {
        if (level > 0 && level < 11) {
            tfLevel.setText("" + level);
        }
    }

    /**
     * 设置“开始”按钮的状态。
     */
    public void setPlayButtonEnable(boolean enable) {
        btPlay.setEnabled(enable);
    }

    public void setPauseButtonEnable(boolean enable) {
        btPause.setEnabled(enable);
    }

    public void setPauseButtonLabel(boolean pause) {
        btPause.setText(pause ? " 暂停" : " 继续");
    }

    public void setStopButtonEnable(boolean enable) {
        btStop.setEnabled(enable);
    }

    public void setTurnLevelUpButtonEnable(boolean enable) {
        btTurnLevelUp.setEnabled(enable);
    }

    public void setTurnLevelDownButtonEnable(boolean enable) {
        btTurnLevelDown.setEnabled(enable);
    }

    /**
     * 重置控制面板
     */
    public void reset() {
        tfScore.setText(" 0");
        plTipBlock.setStyle(0);
    }

    /**
     * 重新计算TipPanel里的boxes[][]里的小框的大小
     */
    public void fanning() {
        plTipBlock.fanning();
    }

    /**
     * 预显窗口的实现细节类
     */
    private class TipPanel extends JPanel {                                    //TipPanel用来显示下一个将要出现方块的形状

        private Color backColor = Color.LIGHT_GRAY, frontColor = Color.ORANGE;
        private ErsBox[][] boxes = new ErsBox[ErsBlock.BOXES_ROWS][ErsBlock.BOXES_COLS];
        private int style, boxWidth, boxHeight;
        private boolean isTiled = false;

        /**
         * 预显示窗口类构造函数
         */
        public TipPanel() {
            for (int i = 0; i < boxes.length; i++) {
                for (int j = 0; j < boxes[i].length; j++) {
                    boxes[i][j] = new ErsBox(false);
                }
            }
        }

        /**
         * 预显示窗口类构造函数
         *
         * @param backColor Color,窗口的背景色
         * @param frontColor Color,窗口的前景色
         */
        public TipPanel(Color backColor, Color frontColor) {
            this();
            this.backColor = backColor;
            this.frontColor = frontColor;
        }

        /**
         * 设置预显示窗口的方块样式
         *
         * @param style int,对应ErsBlock类的STYLES中的28个值
         */
        public void setStyle(int style) {
            this.style = style;
            repaint();
        }

        /**
         * 覆盖JComponent类的函数,画组件。
         *
         * @param g 图形设备环境
         */
        @Override
        public void paintComponent(Graphics g) {
            super.paintComponent(g);

            if (!isTiled) {
                fanning();
            }

            int key = 0x8000;
            for (int i = 0; i < boxes.length; i++) {
                for (int j = 0; j < boxes[i].length; j++) {
                    Color color = ((key & style) != 0 ? frontColor : backColor);
                    g.setColor(color);
                    g.fill3DRect(j * boxWidth, i * boxHeight,
                            boxWidth, boxHeight, true);
                    key >>= 1;
                }
            }
        }

        /**
         * g根据窗口的大小,自动调整方格的尺寸
         */
        public void fanning() {
            boxWidth = getSize().width / ErsBlock.BOXES_COLS;
            boxHeight = getSize().height / ErsBlock.BOXES_ROWS;
            isTiled = true;
        }
    }
}

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