GUI编写贪吃蛇

Data.java

package com.kuang.snake;

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

//数据中心
public class Date {

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

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

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

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

}

GamePanel.java

package com.kuang.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;

//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[500];//蛇的Y坐标25*25
    String fx;//初始方向向右

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

    int score;//成绩
    //当前游戏的状态：  开始，停止！
    boolean isStart = false;//默认是不开始！
    boolean isFail = false;//游戏失败状态     默认不失败

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

    //构造器
    public GamePanel() {
        init ();
        //获得焦点和键盘事件
        this.setFocusable (true);//获取焦点事件
        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";//初始化方向向右
        //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，我们游戏中的所有东西，都是用这个画笔来画
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent (g);// 清屏
        //绘制静态面板
        this.setBackground (Color.WHITE);
        Date.header.paintIcon (this,g,25,11);//头部广告栏画上去
        g.fillRect (25,75,850,600);
        //画积分
        g.setColor (Color.BLUE);
        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
        Date.food.paintIcon (this,g,foodx,foody);

        //把小蛇画上去
        if (fx.equals ("R")){
            Date.right.paintIcon (this,g,snakeX[0],snakeY[0]);//蛇头初始化向右，需要通过方向来判断
        }else if (fx.equals ("L")){
            Date.left.paintIcon (this,g,snakeX[0],snakeY[0]);//蛇头初始化向右，需要通过方向来判断
        }else if (fx.equals ("U")){
            Date.up.paintIcon (this,g,snakeX[0],snakeY[0]);//蛇头初始化向右，需要通过方向来判断
        }else if (fx.equals ("D")){
            Date.down.paintIcon (this,g,snakeX[0],snakeY[0]);//蛇头初始化向右，需要通过方向来判断
        }

        for (int i = 1; i < length; i++) {
            Date.body.paintIcon (this,g,snakeX[i],snakeY[i]);//第i个身体坐标
        }

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

        if (isFail){
            g.setColor (Color.RED);
            g.setFont (new Font ("微软雅黑",Font.BOLD,40));
            g.drawString ("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 ();//获得键盘按键是哪一个
        if (keyCode==KeyEvent.VK_SPACE){//如果按下的事空格键
            if (isFail){
                //重新开始
                isFail=false;
                init ();
            }else {
                isStart= !isStart;//取反
            }
            repaint ();
        }
        //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----需要通过固定事件来刷新，1s=10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++;
                //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--){//后一节移到前一节的位置 snakeX[1] = snakeX[0];
                snakeX[i] =snakeX[i-1];
                snakeY[i] = snakeY[i-1];
            }
            //走向
            if (fx.equals ("R")){
                snakeX[0] = snakeX[0]+25;
                //边界判断
                if (snakeX[0]>850) {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;}
            }
            //失败判读撞到自己就算失败(或者也可以规定撞到边界)
            for (int i = 1; i < length; i++) {
                if (snakeX[0]==snakeX[i]&&snakeY[0]==snakeY[i]){
                    isFail = true;
                }
            }
            repaint ();//重置画面
        }
        timer.start ();
    }
    @Override
    public void keyTyped(KeyEvent e) {
    }
    @Override
    public void keyReleased(KeyEvent e) {
    }
}

StartGame.java

package com.kuang.snake;

import javax.swing.*;

//游戏的主启动类
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.setDefaultCloseOperation (WindowConstants.EXIT_ON_CLOSE);
        //正常游戏界面都应该在面板上！
        frame.add (new GamePanel ());
        frame.setVisible (true);
    }
}