贪吃蛇小游戏

贪吃蛇

GUI
监听
定时器Timer

1.定义数据
2.画上去
3.监听事件
键盘
事件

代码

• 游戏主启动类

package com.deng.snake;

import javax.swing.*;
import java.util.concurrent.ConcurrentHashMap;

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

        frame.setBounds(10,10,900,720);
        frame.setResizable(false);
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //正常游戏都应该在面上！
        frame.add(new GamePanel());

        frame.setVisible(true);
    }
}

• 数据中心

package com.deng.snake;

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

//数据中心
public class Data {

    //相对路径 1.jpg
    //绝对路径  / 相当于当前的项目
    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);
}

• 游戏的面板

package com.deng.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;
import java.util.TreeMap;

//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;

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

    int score;//成绩

    //游戏当前的状态：开始 停止
    boolean isStart = false;//默认不是开始！

    boolean isFail = false;//游戏失败状态

    //定时器 ，以毫秒为单位
    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);//获得焦点事件
        this.addKeyListener(this);//获得键盘监听事件
        timer.start();//游戏一开启，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));//设置字体
        g.drawString("长度" + length, 750, 35);
        g.drawString("分数" + score, 750, 50);

        //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,需要通过方向来判断
        } 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]);//第i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, 300);
        }

        if (isFail) {//默认为true
            g.setColor(Color.RED);
            g.setFont(new Font("微软雅黑", Font.BOLD, 40));//设置字体
            g.drawString("失败！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---需要通过固定时间来刷新，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++;//长度+1
                //每一个事物10分
                score = score + 10;
                //再次随机食物
                foodx = 25 + 25 * random.nextInt(34);
                foodx = 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;
                if (snakeX[0] > 850) {
                    snakeX[0] = 25;
                }//边界判断
            } else if (fx.equals("L")) {
                snakeX[0] = snakeX[0] - 25;
                if (snakeX[0] < 25) {
                    snakeX[0] = 850;
                }//边界判断
            } else if (fx.equals("U")) {
                snakeY[0] = snakeY[0] - 25;
                if (snakeY[0] < 75) {
                    snakeY[0] = 650;
                }//边界判断
            } else if (fx.equals("D")) {
                snakeY[0] = snakeY[0] + 25;
                if (snakeY[0] > 650) {
                    snakeY[0] = 75;
                }//边界判断
            }
            //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 keyTyped(KeyEvent e) {

    }

    @Override
    public void keyReleased(KeyEvent e) {

    }

}

运行结果