GUI编程项目：贪吃蛇

 

素材： 

 

 代码：

StartGame

package com.yuan.snake;

import javax.swing.*;

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


        //正常游戏界面应该在面板上，主程序已经结束了
        //后面可能会add一个container
        frame.add(new GamePanel());

        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setVisible(true);
        //尺寸大小是算出来的，界面无法拉伸
        frame.setBounds(10,10,900,730);
        frame.setResizable(false);
    }
}

GamePanel

package com.yuan.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
    //850/25=34     600/25=24   24*34=816
    //游戏里最长能放816块蛇的身体
    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 fx;//初始方向向右

    //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;//默认不开始

    boolean isFail = false;//游戏默认不失败

    //定时器   ms为单位
    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);
        this.addKeyListener(this);//监听器写在当前类里面，用this
        timer.start();//游戏一开始就启动


    }

    //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";

        //把食物随机分配在界面上
        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使用这个画笔来画
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);//清屏的作用

        //绘制静态面板
        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,750,30);
        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 = 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));//设置字体
            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));//设置字体
            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) {//如果按下的是空格
            if (isFail) {
                //重新开始
                isFail = false;
                init();
            } else {
                isStart = !isStart;//取反，不能写死true，不断按不断切状态
            }
            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-->需要通过固定的时间来刷新，1秒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++;//长度加1
                //分数+10
                score+=10;
                //再次随机食物
                foodX = 25 + 25 * random.nextInt(34);
                foodY = 75 + 25 * random.nextInt(24);
            }


            //移动：后一节移到前一节的位置
            for (int i = length - 1; i > 0; i--) {
                snakeX[i] = snakeX[i - 1];//身体向前移动一节
                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;
                //边界判断
                if (snakeX[0] < 25) {
                    snakeX[0] = 850;
                }
            } else if (fx.equals("U")) {
                snakeY[0] = snakeY[0] - 25;
                //边界判断
                if (snakeY[0] < 75) {
                    snakeY[0] = 650;
                }
            } else if (fx.equals("D")) {
                snakeY[0] = snakeY[0] + 25;
                //边界判断
                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
        }
        timer.start();
    }

    @Override
    public void keyReleased(KeyEvent e) {

    }

    @Override
    public void keyTyped(KeyEvent e) {

    }


}

Data

package com.yuan.snake;


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

//数据中心
public class Data {

    //相对路径      header.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 bodyURL=Data.class.getResource("statics/body.png");
    public static URL foodURL=Data.class.getResource("statics/food.png");
    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 body =new ImageIcon(bodyURL);
    public static ImageIcon food =new ImageIcon(foodURL);
    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);
}

来源：b站狂神

https://www.bilibili.com/video/BV1DJ411B75F?p=21