贪吃蛇

package com.wang.snake;

import javax.swing.*;
import java.net.URL;

//数据中心
public class Data {
    //相对路径 a.jpg
    //绝对路径 /相当于当前项目
    public static URL headerURL=Data.class.getResource("statics/title.jpg");
    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 header=new ImageIcon(headerURL);
    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);
}

package com.wang.snake;

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.Random;

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[500]; //蛇的y坐标:25*25
    String fx;

    //食物的坐标
    int foodx;
    int foody;
    Random random=new Random();

    int score; //成绩

    //游戏当前状态： 开始  停止
    boolean isStart = false; //默认是不开始

    boolean isFail=false; //游戏失败状态

    //定时器 1000ms=1s
    Timer timer = new Timer(100, this);//100ms执行一次

    //构造器
    public GamePanel() {
        init();
        //获得焦点和键盘事件
        this.setFocusable(true);//获得焦点事件
        this.addKeyListener(this);//获得键盘监听事件
        timer.start();//游戏一开始定时器就启动
    }


    //初始化方法
    public void init() {
        length = 3;
        snakex[0] = 100;
        snakey[0] = 100; //脑袋的坐标
        snakex[1] = 75;
        snakey[1] = 100; //第一个身体的坐标
        snakex[2] = 50;
        snakey[2] = 100; //第二个身体的坐标
        fx = "R";//初始方向向右

        //把食物随机分布在界面上
        foodx=25+25*random.nextInt(34);
        foody=75+25*random.nextInt(24);

        score=0;

    }


    //绘制面板，我们游戏中所有东西，都是用这个画笔来画的
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);//清屏
        //绘制静态面板
        this.setBackground(Color.WHITE);
        Data.header.paintIcon(this, g, 25, 11);//头部广告栏
        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));//设置字体
        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 (fx.equals("R")) {
            Data.right.paintIcon(this, g, snakex[0], snakey[0]);   //蛇头初始化向右
        } else if (fx.equals("L")) {
            Data.left.paintIcon(this, g, snakex[0], snakey[0]);   //蛇头初始化向右
        } else if (fx.equals("U")) {
            Data.up.paintIcon(this, g, snakex[0], snakey[0]);   //蛇头初始化向右
        } else if (fx.equals("D")) {
            Data.down.paintIcon(this, g, snakex[0], snakey[0]);   //蛇头初始化向右
        }


        for (int i = 0; i < length; i++) {
            Data.body.paintIcon(this, g, snakex[i], snakey[i]);//第一个身体的坐标
        }



        //游戏状态
        if (isStart == false) {
            g.setColor(Color.white);
            g.setFont(new Font("微软雅黑", Font.BOLD, 40));//设置字体
            g.drawString("按下空格开始游戏", 300, 400);
        }

        if (isFail){
            g.setColor(Color.red);
            g.setFont(new Font("微软雅黑", Font.BOLD, 40));//设置字体
            g.drawString("失败，按下空格重新开始", 300, 400);
        }


    }


    //键盘监听事件
    @Override
    public void keyPressed(KeyEvent e) {
        int keyCode = e.getKeyCode();//获得键盘按键是哪一个
        if (keyCode == KeyEvent.VK_SPACE) {//如果按下的是空格
            if (isFail){
                //重新开始
                isFail=false;
                init();
            }else {
                isStart=!isStart;
            }
        }
        //小蛇移动
        if (keyCode == KeyEvent.VK_UP) {
            fx = "U";
        } else if (keyCode == KeyEvent.VK_DOWN) {
            fx = "D";
        } else if (keyCode == KeyEvent.VK_LEFT) {
            fx = "L";
        } else if (keyCode == KeyEvent.VK_RIGHT) {
            fx = "R";
        }

    }

    //事件监听---需要固定事件来刷新。 1s10次
    @Override
    public void actionPerformed(ActionEvent e) {
        if (isStart&&isFail==false) {//如果游戏是开始状态，就让小蛇动起来

            //吃食物
            if (snakex[0]==foodx&&snakey[0]==foody){
                length++;//长度+1

                //分数加10
                score+=10;
                //再次随机食物
                foodx=25+25*random.nextInt(34);
                foody=75+25*random.nextInt(24);
            }

            //右移
            for (int i = length - 1; i > 0; i--) {//后一节移动到前一节的位置 snakex[1]=snakex[0]
                snakex[i] = snakex[i - 1];//向前移动一节
                snakey[i] = snakey[i - 1];
            }

            //走向
            if (fx.equals("R")) {
                snakex[0] = snakex[0] + 25;
                if (snakex[0] > 850) {//边界判断
                    snakex[0] = 25;
                }
            } else if (fx.equals("L")) {
                snakex[0] = snakex[0] - 25;
                if (snakex[0] < 25) {
                    snakex[0] = 850;
                }
            } else if (fx.equals("U")){
                snakey[0]=snakey[0]-25;
                if (snakey[0]<75){
                    snakey[0]=650;
                }
            }else if (fx.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();//重画页面
        }
        timer.start();//定时器开启！
    }


    @Override
    public void keyReleased(KeyEvent e) {

    }

    @Override
    public void keyTyped(KeyEvent e) {

    }


}

package com.wang.snake;

import javax.swing.*;

public class StartGame {
    public static void main(String[] args) {
        JFrame frame = new JFrame();

        frame.setBounds(10,10,900,720);
        frame.setResizable(false);//窗口大小不可变

        frame.setVisible(true);
        frame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);


        //正常游戏界面都应该在面板上
        frame.add(new GamePanel());
    }
}