Java基于GUI编程写的贪吃蛇（附源文件下载地址）

贪吃蛇

成品展示

帧，如果事件片足够小，就是动画，1秒30帧 60帧。 连起来是动画，拆开就是静态的图片！

• 键盘监听
• 定时器 Timer

步骤:

1. 定义数据类型
2. 画上去图案
3. 监听事件
   • 鼠标
   • 键盘

StartGame:

package com.yanxun.game;

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);//窗口不可变
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        //正常的游戏界面都是在面板上！
        frame.add(new GamePanel());
        frame.setVisible(true);
    }
}

Data.Java:

package com.yanxun.game;

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

//数据中心
public class Data {
    //相对路径
    //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:

package com.yanxun.game;

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
    int[] snakeY = new int[500];//蛇的Y坐标

    String fx;
    //游戏当前的状态：开始停止
    boolean isStart = false;
    //定时器 以毫秒为单位
    Timer timer = new Timer(100, this);//监听this这个对象，100毫秒执行一次。

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

    //游戏失败判断
    boolean isFail = false;
    //成绩
    int score;

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

    public void init() {
        length = 3;
        snakeX[0] = 100;snakeY[0] = 100;//蛇头的坐标
        snakeX[1] = 75;snakeY[1] = 100;//第一个身体坐标
        snakeX[2] = 50;snakeY[2] = 100;//第二个身体坐标
        fx = "R";
        //把食物随机生成
        foodX = 25 + 25 * random.nextInt(34);
        foodY = 75 + 25 * random.nextInt(24);
        speed = 300;
        score = 0;
    }



    //绘制面板， 我们游戏中都使用这个画笔来画
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);//去掉游戏的闪烁

        //绘制静态的面板
        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));
        g.drawString("长度 " + length, 750, 35);
        g.drawString("分数 " + score, 750, 60);
        //画小蛇
        if (fx.equals("R")) {
            Data.right.paintIcon(this, g, snakeX[0], snakeY[0]);
        }else if(fx.equals("L")) {
            Data.left.paintIcon(this, g, snakeX[0], snakeY[0]);
        }else if(fx.equals("U")) {
            Data.up.paintIcon(this, g, snakeX[0], snakeY[0]);
        }else if(fx.equals("D")) {
            Data.down.paintIcon(this, g, snakeX[0], snakeY[0]);
        }
        for (int i = 1; i < length; ++ i) {
            Data.body.paintIcon(this, g, snakeX[i], snakeY[i]);
        }
        //画食物
        Data.food.paintIcon(this, g, foodX, foodY);
        //游戏状态
        if (!isStart) {
            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("失败，按下空格重新开始游戏", 300, 300);
        }
    }

    @Override
    public void keyTyped(KeyEvent e) {

    }

    @Override
    public void keyPressed(KeyEvent e) {
        int keyCode = e.getKeyCode();//获得键盘按件是哪一个
        if (keyCode == KeyEvent.VK_SPACE) {
            if (isFail) {
                //重新开始
                isFail = false;
                init();
            }else {
                isStart = !isStart;
            }
            repaint();
        }
        //小蛇移动
        if (keyCode == KeyEvent.VK_UP) {
            if (!fx.equals("D"))
                fx = "U";
        }else if (keyCode == KeyEvent.VK_DOWN) {
            if (!fx.equals("U"))
                fx = "D";
        }else if (keyCode == KeyEvent.VK_LEFT) {
            if (!fx.equals("R"))
                fx = "L";
        }else if (keyCode == KeyEvent.VK_RIGHT) {
            if (!fx.equals("L"))
                fx = "R";
        }else if (keyCode == KeyEvent.VK_ESCAPE) {
            System.exit(0);
        }
    }

    @Override
    public void keyReleased(KeyEvent e) {

    }

    //事件监听---需要通过固定的事件来刷新，1s = 10次
    @Override
    public void actionPerformed(ActionEvent e) {

        if (isStart && !isFail) {//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++;
                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) {//后一节移动到前一节的位子 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;
                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;
                }
            }
            //失败判定，撞到自己
            for (int i = 1; i < length; ++ i) {
                if (snakeX[i] == snakeX[0] && snakeY[i] == snakeY[0])
                    isFail = true;
            }

            //边界判断

            repaint();//重新画
        }
        //定时器开启
    }



}

源代码下载地址

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