GUI编程之贪吃蛇小游戏

本篇实现的是贪吃蛇小游戏，使用的是Java语言，GUI编程。

//启动类

import snake.GamePanel;

import javax.swing.*;
import java.awt.*;

public class Start extends JFrame{

    public Start() {

        this.setBounds(10, 10, 900, 720);
        setResizable(false);//窗口大小不可变
        this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        this.setVisible(true);
        //正常游戏界面都应该在面上！
        Game panel = new Game();
        Container container = this.getContentPane();
        container.add(panel);
    }

//主类

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;

//绘制游戏界面
//初始化、画笔JPanel、监听：键盘；事件监听（吃食物）
public class Game extends JPanel implements KeyListener, ActionListener {

    //属性
    String dir;//蛇头方向
    int[] snake_x =new int[600];//蛇位置
    int[] snake_y =new int[600];
    int food_x;//食物位置
    int food_y;
    Random random = new Random();
    int length ;
    int score;
    //游戏状态
    Boolean isstart =false;
    Boolean isfail =false;
    //定时器
    Timer timer = new Timer(100, this);//100ms执行一次定时器



    //无参构造
    public Game() {
        init();
        this.setFocusable(true);
        this.addKeyListener(this);
        timer.start();
    }

    //游戏开始和重新开始需要初始化，重新开始小蛇位置和分数等，还原到原始状态
    public void init() {

        //蛇头初始位置
        snake_x[0] = 100;snake_y[0] = 100;
        snake_x[1] = 75;snake_y[1] = 100;
        snake_x[2] = 50;snake_y[2] = 100;
        //初始方向
        dir = "R";
        //随机初始食物位置
        food_x=  25+25*random.nextInt(34);
        food_y= 75+25*random.nextInt(24);
        length=3;
        //绘制计分器
        score=0;

//        timer.start();

    }

    //绘制面板 重写JComponet方法
    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        setBackground(Color.WHITE);
        Data.header.paintIcon(this,g,25,11);
        g.fillRect(25,75,850,600);
        //画蛇头
        switch (dir) {
            case"R":
                Data.right.paintIcon(this,g,snake_x[0],snake_y[0]);
                break;
            case"L":
                Data.left.paintIcon(this,g,snake_x[0],snake_y[0]);
                break;
            case"U":
                Data.up.paintIcon(this,g,snake_x[0],snake_y[0]);
                break;
            case"D":
                Data.down.paintIcon(this,g,snake_x[0],snake_y[0]);
                break;
        }
        //画食物
        Data.food.paintIcon(this,g,food_x,food_y);
        //画蛇身
        for (int i = 1; i <length ; i++) {
            Data.body.paintIcon(this,g,snake_x[i],snake_y[i]);
        }
        //绘制计分器
        g.setColor(Color.WHITE);
        g.setFont(new Font("微软雅黑",Font.BOLD,18));
        g.drawString("分数"+(length-3)*10,750,50);

        //绘制开始提示问题
        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);
        }



    }

    @Override
    public void actionPerformed(ActionEvent e) {

        if (isstart == true && isfail == false) {
            //吃食物
            if (snake_x[0] == food_x && snake_y[0]==food_y){
                length++;
                //再次随机生成食物
                food_x=  25+25*random.nextInt(34);
                food_y= 75+25*random.nextInt(24);
            }
            //小蛇移动
            for (int i = length-1; i >0 ; i--) {
                snake_x[i]=snake_x[i-1];
                snake_y[i]=snake_y[i-1];
            }
            switch (dir) {
                case "U":
                    snake_y[0]-=25;
                    if(snake_y[0]<75){
                        snake_y[0]=650;
                    }
                    break;
                case "D":
                    snake_y[0]+=25;
                    if(snake_y[0]>650){
                        snake_y[0]=75;
                    }
                    break;
                case "L":
                    snake_x[0]-=25;
                    if(snake_x[0]<25){
                        snake_x[0]=850;
                    }
                    break;
                case "R":
                    snake_x[0]+=25;
                    if(snake_x[0]>850){
                        snake_x[0]=25;
                    }
                    break;
            }
            repaint();

        }
        //小蛇移动
        if(isstart)
        //判断失败
        for (int i = 1; i <length ; i++) {
            if(snake_x[0] == snake_x[i] && snake_y[0] ==snake_y[i]){
                isfail=true;
            }

        }
        timer.start();



    }



    @Override
    public void keyPressed(KeyEvent e) {
        //获得按键码
        int keyCode = e.getKeyCode();
        switch (keyCode){
            case KeyEvent.VK_SPACE:
                if(isfail){
                    isfail=false;
                    init();
                } else {
                    isstart =! isstart;
                }
                repaint();//重新画图
                break;
            case KeyEvent.VK_UP:
                dir = "U";
                break;
            case KeyEvent.VK_DOWN:
                dir = "D";
                break;
            case KeyEvent.VK_LEFT:
                dir = "L";
                break;
            case KeyEvent.VK_RIGHT:
                dir = "R";
                break;
        }

    }

    @Override
    public void keyReleased(KeyEvent e) {

    }
    @Override
    public void keyTyped(KeyEvent e) {

    }
}

//数据类

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

/**
 * 功能：加载图片资源，在Game类中加载到画板上
 * */
public class Data {

    //头部图片
    public static URL headerURL = Data.class.getResource("statics/header.png");
    public static ImageIcon header= new ImageIcon(headerURL);
    //蛇头上下左右
    public static URL upURL = Data.class.getResource("statics/up.png");
    public static ImageIcon up= new ImageIcon(upURL);
    public static URL downURL = Data.class.getResource("statics/down.png");
    public static ImageIcon down= new ImageIcon(downURL);
    public static URL leftURL = Data.class.getResource("statics/left.png");
    public static ImageIcon left= new ImageIcon(leftURL);
    public static URL rightURL = Data.class.getResource("statics/right.png");
    public static ImageIcon right= new ImageIcon(rightURL);
    //蛇身
    public static URL bodyURL = Data.class.getResource("statics/body.png");
    public static ImageIcon body= new ImageIcon(bodyURL);
    //食物
    public static URL foodURL = Data.class.getResource("statics/food.png");
    public static ImageIcon food= new ImageIcon(foodURL);



}

运行结果：

 

注：程序中所有用到图片素材在主页上传的资源中，粉丝即可下载，无需积分！ 

 

 

 

本文地址：https://blog.csdn.net/qq_38723455/article/details/112007463