Java實現(xiàn)接月餅小游戲的示例代碼

更新時間：2022年02月28日 10:16:35 作者：小虛竹and掘金

本文將用Java語言自制一個小游戲：《接月餅小游戲》，游戲規(guī)則為不要被月亮砸到，盡可能地多接月餅。文中的實現(xiàn)代碼講解清晰，感興趣的可以動手試一試

前言

《接月餅小游戲》是一個基于java的自制游戲，不要被月亮砸到，盡可能地多接月餅。

此小項目可用來鞏固JAVA基礎(chǔ)語法，swing的技巧用法。

主要設(shè)計

設(shè)計游戲界面，用swing實現(xiàn)
設(shè)計背景
設(shè)計得分物體-月餅，碰到加一分
設(shè)計障礙物-月亮，碰到會死亡
監(jiān)聽鼠標(biāo)的左右鍵，用來控制籃子左右移動
設(shè)計積分系統(tǒng)
將resource文件夾設(shè)為resource（Project Manage中可以設(shè)置），因為要用里面的圖片

功能截圖

游戲開始界面：

代碼實現(xiàn)

游戲啟動類

public class Start {
    public static void main(String[] args) throws URISyntaxException {
        new EatGame();
    }
}

核心類

public class EatGame extends JFrame implements ActionListener, MouseListener
{
    private final int WIDTH = 400;
    private final int HEIGHT = 800;
    private int score;
    private int ticks; 
    private boolean gameOver = false;
    private GameControl control; 
    private List<Moon> moons;
    private List<Cake> cakes;
    private Timer timer;
    private ChangeE changeE;
    /**
     * Constructor for objects of class FallingGame
     */
    public EatGame() throws URISyntaxException {


        changeE = new ChangeE(150, 650, "player.jpg", WIDTH);
        moons = new ArrayList<>();
        cakes = new ArrayList<>();
        addMoonAndCake();
        
        control = new GameControl(changeE, moons, cakes);
        timer = new Timer(20, this); 
        
        //add keybinds
        control.addAction("Left", -20, KeyEvent.VK_LEFT);
        control.addAction("Right", 20, KeyEvent.VK_RIGHT);
        
        //add components
        add(control);
        addMouseListener(this);
        control.addMouseListener(this);
        setTitle("吃月餅");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        setSize(WIDTH, HEIGHT);
        setResizable(false);
        setVisible(true);
       
        timer.start();

    }

    /**
     * 添加月亮和月餅
     */
    public void addMoonAndCake() {
        Random r = new Random();
        int x, y;
        x = 60 + (r.nextInt(35) * 2);
        y = r.nextInt(20) + moons.size() * 30;
        Moon moon1 = new Moon(x, y, "moon.png");
        moons.add(moon1);

        x = 190 + r.nextInt(35) * 2;
        y = r.nextInt(20) + moons.size() * 30;
        Moon moon2 = new Moon(x, y, "moon.png");
        moons.add(moon2);

        x = 80 + (r.nextInt(35) * 2);
        y = r.nextInt(20) + moons.size() * 50;
        Cake cake = new Cake(x, y, "cake.png");
        cakes.add(cake);
    }

    /**
     * 更新窗口
     */
    private void updateFrame() {
        ticks++;
        for(int i = 0; i < moons.size(); i++)
        {
            Moon moon = moons.get(i);
            if(ticks % 25 == 0 && moon.getSpeed() < 10)
            {
                moon.setSpeed(moon.getSpeed() + 2);
            }
        }
        Iterator<Moon> moonIterator = moons.iterator();
        while (moonIterator.hasNext()) {
            Moon moon = moonIterator.next();
            // 超出屏幕
            if(moon.getY() > HEIGHT) {
                moonIterator.remove();
            } else
                moon.move();
        }
        Iterator<Cake> cakeIterator = cakes.iterator();
        while (cakeIterator.hasNext()) {
            Cake cake = cakeIterator.next();
            // 超出屏幕
            if(cake.getY() > HEIGHT) {
                cakeIterator.remove();
            } else
                cake.move();
        }
        if(moons.size() == 0) {
            addMoonAndCake();
        }
    }

    private boolean checkCollision() {
        Rectangle rectangle = (Rectangle) changeE.getShape();
        for(Moon moon : moons) {
            Ellipse2D circle = (Ellipse2D) moon.getShape();
            // 判斷是否與圓形相撞
            if (circle.intersects(rectangle)) {
                gameOver = true;
            }
        }
        Iterator<Cake> cakeIterator = cakes.iterator();
        while (cakeIterator.hasNext()) {
            Cake cake = cakeIterator.next();
            Ellipse2D circle = (Ellipse2D) cake.getShape();
            if (circle.intersects(rectangle)) {
                score ++;   // 得分
                cakeIterator.remove();
            }
        }
        return gameOver;
    }
    public void actionPerformed(ActionEvent e)
    {
        if(gameOver) {
            timer.stop(); 
            control.drawEnd(control.getGraphics(), score);
        } else {
            //continue with game
            updateFrame();
            checkCollision();
            control.repaint(); 
        }
    }
    public void mouseClicked(MouseEvent e) {

    }
    public void mousePressed(MouseEvent e)
    {
        if(gameOver)
        {
            //reset game
            moons.clear();
            control.removeAll(); 
            control.updateUI(); 
            score = 0;
            changeE.setX(150);
            changeE.setY(650);
            addMoonAndCake();
            timer.start();
            repaint();
            gameOver = false; 
        }
    }
    public void mouseReleased(MouseEvent e)
    {
        
    }
    public void mouseEntered(MouseEvent e)
    {
        
    }
    public void mouseExited(MouseEvent e)
    {
        
    }
}

畫面繪制

/**
 * 畫面繪制
 */
public class GameControl extends JPanel
{
    private InputMap inputMap; 
    private ChangeE myChangeE;
    private List<Moon> moons;
    private List<Cake> cakes;


    public GameControl(ChangeE changeE, List<Moon> moons, List<Cake> cakes)
    {
        this.myChangeE = changeE;
        this.moons = moons;
        this.cakes = cakes;
        setBackground(Color.white);
        inputMap = getInputMap(WHEN_IN_FOCUSED_WINDOW);  
    }

    @Override
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        // 繪制背景
        ImageIcon icon=new ImageIcon(Thread.currentThread().getContextClassLoader().getResource("background.png"));
        Image img=icon.getImage();
        g.drawImage(img, 0, 0, this.getWidth(), this.getHeight(), this);
        // 繪制玩家
        g.drawImage(myChangeE.getImage(), myChangeE.getX(), myChangeE.getY(), this);
        // 繪制月亮
        for(Moon moon : moons) {
            g.drawImage(moon.getImage(), moon.getX(), moon.getY(), this);
        }
        // 繪制月餅
        for (Cake cake : cakes) {
            g.drawImage(cake.getImage(), cake.getX(), cake.getY(), this);
        }
        
    }


    public void drawEnd(Graphics g, int score)
    {
        g.setColor(Color.WHITE);
        g.fillRect(50, 200, 300, 300);
        g.setColor(Color.RED);
        g.drawString("祝你中秋快樂，闔家歡樂!", 100, 300);
        g.setColor(Color.BLUE);
        g.drawString("您吃的到的月餅個數(shù)為：" + score, 100, 350);
        g.setColor(Color.BLACK);
        g.drawString("鼠標(biāo)點擊重玩", 100, 400);
    }


    public void addAction(String name, int deltaX, int keyCode) {
        MoveAction moveAction = new MoveAction(name, deltaX);
        inputMap.put(KeyStroke.getKeyStroke(keyCode, 0), name);
        getActionMap().put(name, moveAction);
    } 


    private class MoveAction extends AbstractAction implements ActionListener {
        private int myDeltaX;


        public MoveAction(String name, int deltaX) {
            super(name);
            myDeltaX = deltaX;
        }

        public void actionPerformed(ActionEvent e) {
            myChangeE.move(myDeltaX);
        }
    }
}