java贪吃蛇

不那么low的贪吃蛇...以及贪吃蛇寻路算法....算法这里暂时不提，只提贪吃蛇小游戏的制作

整体内容来说比扫雷简单...但是因为了有了图片，所以看起来肯定要比上一篇的扫雷高级很多......

然后我在代码中增加了寻路ai以及更高一层的UI界面....依然很丑的UI界面....

github:​​https://github.com/jnxxhzz/java-snake​​

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因为贪吃蛇跟扫雷不同，扫雷是全局静态只需要修改每个按钮的状态，而贪吃蛇需要每次重画整个界面，所以将游戏整体与画布分开写在两个类里

Snake.java

设置基础窗口格式，并且添加画布到frame里

public class Snake {

  public static void main(String[] args) {
    // TODO Auto-generated method stub
    new Snake();
  }
  public Snake() {
    JFrame frame = new JFrame();
    //基本窗口设置
    frame.setBounds(10,10,1000,720);
    frame.setResizable(false);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.setTitle("Snake");
    
    Snakebackground panel = new Snakebackground();
    
    frame.add(panel);
    
    
    frame.setVisible(true);
  }

}

Snakebackground类这里需要监听键盘输入keylistener和动作actionlistener

全局变量设置，这里的坐标跨度全部为25，因为蛇身蛇头的像素为25*25

ImageIcon upIcon = new ImageIcon("up.png");
  ImageIcon downIcon = new ImageIcon("down.png");
  ImageIcon leftIcon = new ImageIcon("left.png");
  ImageIcon rightIcon = new ImageIcon("right.png");
  ImageIcon[] headIcon = new ImageIcon[5];
  ImageIcon title = new ImageIcon("title.png");
  ImageIcon food = new ImageIcon("food.png");
  ImageIcon body = new ImageIcon("body.png");
  int dirright = 0;
  int dirleft = 1;
  int dirup = 2;
  int dirdown = 3;
  Timer timer = new Timer(100,this);
  
  //蛇的属性
  int[] snake_x = new int[750];
  int[] snake_y = new int[750];
  int len = 3;
  int direction = 1;
  int dirx[] = {25,-25, 0,  0};
  int diry[] = {0 ,  0,-25, 25};
  //0 1 2 3
  //R L U D
  
  //食物属性
  Random rand = new Random();
  int foodx = (rand.nextInt(36))*25 + 25;
  int foody = (rand.nextInt(24))*25 + 75;
  
  
  boolean gamestart = false;
  boolean gameover = false;

首先初始化初始蛇头以及gameover和gamestart

public void setup() {
    headIcon[0] = rightIcon;
    headIcon[1] = leftIcon;
    headIcon[2] = upIcon;
    headIcon[3] = downIcon;
    gamestart = false;
    gameover = false;
    
    len = 3;
    direction = dirright;
    snake_x[0] = 100;
    snake_y[0] = 100;
    snake_x[1] = 75;
    snake_y[1] = 100;
    snake_x[2] = 50;
    snake_y[2] = 100;
  }

增加监听以及增加timer计时器，也可以理解成隔多久刷新画布，也就是蛇的移动速度

public Snakebackground() {
    this.setFocusable(true); //获得焦点
    this.addKeyListener(this);
    //初始化snake
    setup();
    timer.start();
    
  }

然后在画布上画出整体框架，并且按照gameover和gamestart标记判断是否需要写出开始/暂停游戏的提示

public void paint(Graphics x) {
    super.paint(x);
    this.setBackground(Color.white);
    
    title.paintIcon(this, x, 25, 11);
    //背景色
    x.fillRect(25, 75, 900, 600);

    //蛇头
    headIcon[direction].paintIcon(this, x, snake_x[0], snake_y[0]);
    //蛇身
    for (int i=1;i<len;i++) body.paintIcon(this,x,snake_x[i],snake_y[i]);
  
    if (gameover == true) {
      x.setColor(Color.white);
      x.setFont(new Font("arial",Font.BOLD,30));
      x.drawString("Game over", 300, 300);
      x.drawString("Press space to Start again", 300, 400);
    }
    
    if (gamestart == false) {
      x.setColor(Color.white);
      x.setFont(new Font("arial",Font.BOLD,30));
      x.drawString("Press space to Start/Pause", 300, 300);
    }
    
    //食物
    food.paintIcon(this, x, foodx, foody);
    
    x.setColor(Color.white);
    x.setFont(new Font("arial",Font.PLAIN,20));
    x.drawString("Score: " + (len-3), 750, 30);
  }

计时器结束后，需要重启计时器，然后蛇整体移动一步，并且判断吃到食物或撞到自己的情况

public void actionPerformed(ActionEvent arg0) {
    // TODO Auto-generated method stub
    
    timer.start(); //重启timer
    //移动身体
    if (gamestart && !gameover) {
      for (int i = len; i > 0 ;i--) {
        snake_x[i] = snake_x[i-1];
        snake_y[i] = snake_y[i-1];
      }
      snake_x[0]+=dirx[direction];
      snake_y[0]+=diry[direction];
      if (snake_x[0] > 900) snake_x[0] = 25;
      if (snake_x[0] < 25)  snake_x[0] = 900;
      if (snake_y[0] > 650) snake_y[0] = 75;
      if (snake_y[0] < 75)  snake_y[0] = 650;
      
    }
    
    //吃到食物
    if (snake_x[0] == foodx && snake_y[0] == foody) {
      len++;
      foodx = (rand.nextInt(36))*25 + 25;
      foody = (rand.nextInt(24))*25 + 75;
    }
    
    //撞到障碍物
    for (int i=1;i<len;i++)
      if (snake_x[i] == snake_x[0] && snake_y[i] == snake_y[0]) {
        gameover = true;
      }

    repaint();
  }

最后通过键盘监听keylistener,控制蛇的方向，以及空格的作用，开始/暂停游戏，或在失败后重新开始游戏

public void keyPressed(KeyEvent e) {
    // TODO Auto-generated method stub
    int keycode = e.getKeyCode();
    
    if (keycode == KeyEvent.VK_SPACE) {
      if (gameover) {
        setup();
        
      }else {
        gamestart = !gamestart;
      }
    }
    if (direction!=dirdown && (keycode == KeyEvent.VK_UP || keycode == KeyEvent.VK_W)) {
      direction = dirup;
    }else if (direction!=dirup && (keycode == KeyEvent.VK_DOWN || keycode == KeyEvent.VK_S)) {
      direction = dirdown;
    }else if (direction!=dirleft && (keycode == KeyEvent.VK_RIGHT || keycode == KeyEvent.VK_D)) {
      direction = dirright;
    }else if (direction!=dirright && (keycode == KeyEvent.VK_LEFT ||  keycode == KeyEvent.VK_A)) {
      direction = dirleft;
    }
  }