目录

• 贪吃蛇
  • 代码
    • Data
    • GamePanel
    • StartGame
  • 图片资源

贪吃蛇

重新看了一遍JPanel，跟着做了贪吃蛇，比较简单的一个项目，由于先前工程实践已用JPanel写过三个游戏，所以跟着敲一边代码只算是练个手，今日总觉没学到什么，不过很期待每天的多线程，当时没学明白现在有机会重新理一遍甚是高兴。

代码

Data

//数据中心
public class Data {

    //相对路径 tx.jpg
    //绝对路径 / 相当于当前项目
    public static URL headerURL = Data.class.getResource("/statics/header.png");
    public static ImageIcon header = new ImageIcon(headerURL);

    public static URL upURL = Data.class.getResource("/statics/up.png");
    public static URL downURL = Data.class.getResource("/statics/down.png");
    public static URL leftURL = Data.class.getResource("/statics/left.png");
    public static URL rightURL = Data.class.getResource("/statics/right.png");
    public static ImageIcon up = new ImageIcon(upURL);
    public static ImageIcon down = new ImageIcon(downURL);
    public static ImageIcon left = new ImageIcon(leftURL);
    public static ImageIcon right = new ImageIcon(rightURL);

    public static URL bodyURL = Data.class.getResource("/statics/body.png");
    public static ImageIcon body = new ImageIcon(bodyURL);

    public static URL foodURL = Data.class.getResource("/statics/food.png");
    public static ImageIcon food = new ImageIcon(foodURL);
}

GamePanel

• 没想到老师居然直接用本类继承接口，直接把本类做成监听器来addListener。。。。感觉实在是杂乱，有点不到位。
• 学会timer的使用Timer timer = new Timer(*dalay:*100,*listener:*this);,用timer.start()控制开始;

//游戏的面板
public class GamePanel extends JPanel implements KeyListener, ActionListener {

    //定义蛇的数据结构
    int length;//蛇的长度
    int[] snakeX = new int[600];//蛇的x坐标25*25
    int[] snakeY = new int[600];//蛇的y坐标25*25
    String direction;//方向

    //食物的坐标
    int foodX;
    int foodY;
    Random random = new Random();

    //成绩
    int Score;

    //游戏当前状态：开始，停止
    boolean isStart = false;//游戏状态默认不开始
    boolean isFail = false;//游戏默认不失败

    //定时器 以毫秒为单位
    Timer timer = new Timer(100,this);//100ms执行一次

    //构造器
    public GamePanel() {
        init();
        this.setFocusable(true);//获得焦点事件
        this.addKeyListener(this);//获得键盘监听，就是当前的类
        timer.start();//游戏一开始，计时器就启动
    }

    //初始化方法
    public void init (){
        length=3;
        snakeX[0] = 100;snakeY[0] = 100;
        snakeX[1] = 75;snakeY[1] = 100;
        snakeX[2] = 50;snakeY[2] = 100;
        direction = "R";//初始方向向右

        //食物初始化
        foodX = 25+25*random.nextInt(34);
        foodY = 75+25*random.nextInt(24);

        Score = 0;
    }


    //绘制面板,游戏中的所有东西都靠这个画笔

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);//清屏

        //绘制静态的面板
        this.setBackground(Color.WHITE);

        Data.header.paintIcon(this,g,25,11);//头部广告栏画上去
        g.fillRect(25,75,850,600);//默认的游戏界面

        //画积分
        g.setColor(Color.WHITE);
        g.setFont(new Font("微软雅黑",Font.BOLD,18));
        g.drawString("长度"+length,750,35);
        g.drawString("分数"+Score,750,55);

        //画食物
        Data.food.paintIcon(this,g,foodX,foodY);

        //把小蛇画上去
        if(direction.equals("R")){
            Data.right.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向右,通过方向判断
        }else if (direction.equals("L")){
            Data.left.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向右,通过方向判断
        }else if (direction.equals("U")){
            Data.up.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向右,通过方向判断
        }else if (direction.equals("D")){
            Data.down.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向右,通过方向判断
        }
        for (int i = 1; i < length; i++) {
            Data.body.paintIcon(this,g,snakeX[i],snakeY[i]);
        }

        //游戏状态
        if(isStart == false){
            g.setColor(Color.white);
            g.setFont(new Font("微软雅黑",Font.BOLD,40));
            g.drawString("按下空格开始游戏",300,300);

        }
        if(isFail){
            g.setColor(Color.red);
            g.setFont(new Font("微软雅黑",Font.BOLD,40));
            g.drawString("游戏失败，按下空格重新开始",300,300);

        }
    }

    //键盘监听事件
    @Override
    public void keyPressed(KeyEvent e) {
        int keyCode = e.getKeyCode();



        if (keyCode == KeyEvent.VK_SPACE){
            if(isFail){
                isFail = false;
                init();
            }else{
                isStart = !isStart;
            }
        }

        //小蛇移动
        if(keyCode==KeyEvent.VK_UP){
            direction = "U";
        }else if(keyCode==KeyEvent.VK_DOWN){
            direction = "D";
        }else if(keyCode==KeyEvent.VK_LEFT){
            direction = "L";
        }else if(keyCode==KeyEvent.VK_RIGHT){
            direction = "R";
        }
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if(isStart && isFail == false){//如果游戏是开始状态，就让小蛇动！

            //吃食物
            if(snakeX[0]==foodX && snakeY[0]==foodY){

                //长度+1
                length++;
                //分数+10
                Score=Score+10;
                //再次随机食物
                foodX = 25+25*random.nextInt(34);
                foodY = 75+25*random.nextInt(24);

            }


            //移动
            for (int i = length-1; i > 0; i--) {//后一节到前一节的位置
                snakeX[i]=snakeX[i-1];
                snakeY[i]=snakeY[i-1];
            }

            //走向
            if(direction.equals("R")){
                snakeX[0]=snakeX[0]+25;
                if(snakeX[0]>850){snakeX[0]=25;}//边界判断
            }else if (direction.equals("L")){
                snakeX[0]=snakeX[0]-25;
                if(snakeX[0]<25){snakeX[0]=850;}//边界判断
            }else if (direction.equals("U")){
                snakeY[0]=snakeY[0]-25;
                if(snakeY[0]<75){snakeY[0]=650;}
            }else if(direction.equals("D")){
                snakeY[0]=snakeY[0]+25;
                if(snakeY[0]>650){snakeY[0]=75;}
            }

            //失败判定，撞到自己就算失败
            for (int i = 1; i < length; i++) {
                if(snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]){
                    isFail = true;
                }
            }

            repaint();
        }
        timer.start();
    }



    @Override
    public void keyTyped(KeyEvent e) {
    }
    @Override
    public void keyReleased(KeyEvent e) {
    }


}

StartGame

//游戏的主启动类
public class StartGame {
    public static void main(String[] args) {
        JFrame frame = new JFrame();

        frame.setBounds(10,10,915,745);
        frame.setResizable(false);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //正常游戏界面应该都在面上
        frame.add(new GamePanel());

        frame.setVisible(true);
    }
}

图片资源