kuangshenshuo-GUI编程-贪吃蛇游戏

GUI编程 --> 贪吃蛇游戏

狂神说的详细视频教程

1. 一些概念

• 帧：如果时间片足够小，就是动画。如1s 30帧。
• 帧拆开就是静态的图片。
• 键盘监听
• 定时器：Timer类

2. 思路

• ①定义数据
• ②绘制图形
• ③添加监听事件

3. 代码实现

3.1 Data

package com.anobabe.snake;

import javax.swing.*;
import java.net.URL;
//数据中心
public class Data {
     
    //相对路径：XX.png
    //绝对路径：/ 相当于当前的项目
    public static URL titleURL = Data.class.getResource("pic/title.jpg");
    public static ImageIcon title = new ImageIcon(titleURL);

    public static URL upURL = Data.class.getResource("pic/up.png");
    public static URL downURL = Data.class.getResource("pic/down.png");
    public static URL leftURL = Data.class.getResource("pic/left.png");
    public static URL rightURL = Data.class.getResource("pic/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("pic/body.png");
    public static ImageIcon body = new ImageIcon(bodyURL);

    public static URL foodURL = Data.class.getResource("pic/food.png");
    public static ImageIcon food = new ImageIcon(foodURL);
}

3.2 StartGame

package com.anobabe.snake;

import javax.swing.*;

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

        frame.setBounds(10,10,920,745);
        frame.setResizable(false); //窗口大小不可变
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

        //正常游戏界面都应在面板上
        frame.add(new GamePanel());

        frame.setVisible(true);
    }
}

3.3 GamePanel

package com.anobabe.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
    String fx; //方向

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

    //游戏当前的状态
    boolean isStart = false;

    //游戏失败状态
    boolean isFail = false;

    //构造器
    public GamePanel() {
     
        init();
        this.setFocusable(true);
        this.addKeyListener(this);
        timer.start();
    }

    //定时器
    Timer timer = new Timer(100,this); //100ms执行一次

    //初始化
    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
        //初始方向为右
        fx = "R";
        
        //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，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
        this.setBackground(Color.WHITE);
        //绘制静态面板
        Data.title.paintIcon(this,g,25,11);
        g.fillRect(25,75,850,600); //默认的游戏界面

        //绘制积分
        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,750,50);

        //绘制食物
        Data.food.paintIcon(this,g,foodX,foodY);

        //绘制小蛇
        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]); //身体的坐标
        }

        //游戏是否开始状态
        if(isStart == false){
     
            g.setColor(Color.WHITE);
            g.setFont(new Font("微软雅黑",Font.BOLD,40));
            g.drawString("按下空格开始游戏",300,300);
        }
		
        //游戏失败状态
        if(isFail){
     
            g.setColor(Color.RED);
            g.setFont(new Font("微软雅黑",Font.BOLD,40));
            g.drawString("失败，按下空客重新开始游戏",300,300);
        }
    }

    //键盘监听事件
    @Override
    public void keyPressed(KeyEvent e) {
     
        int keyCode = e.getKeyCode();
        if(keyCode == KeyEvent.VK_SPACE){
     
            if(isFail){
     
               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
    @Override
    public void actionPerformed(ActionEvent e) {
     
        //如果游戏是开始状态，让小蛇动起来
        if(isStart && isFail == false){
     
            //吃食物，
            if(snakeX[0] == foodX && snakeY[0] == foodY){
     
                //长度+1
                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（键盘监听）
            for(int i = length-1; i > 0; i--){
      //后一节身体移到前一节位置
                snakeX[i] = snakeX[i-1]; //向前移动一节
                snakeY[i] = snakeY[i-1];
            }
            
            //走向
            if(fx == "R"){
     
                snakeX[0] = snakeX[0] + 25;
                //边界判断
                if(snakeX[0] > 850){
      snakeX[0] = 25;}
            }else if(fx == "L"){
     
                snakeX[0] = snakeX[0] - 25;
                if(snakeX[0] < 25){
      snakeX[0] = 850;}
            }else if(fx == "U"){
     
                snakeY[0] = snakeY[0] - 25;
                if(snakeY[0] < 75){
      snakeY[0] = 650;}
            }else if(fx == "D") {
     
                snakeY[0] = snakeY[0] + 25;
                if (snakeY[0] > 650) {
      snakeY[0] = 75;}
            }

            //失败判断：撞到自己就失败
            for(int i = 1; i < length; i++){
     
                if(snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]){
     
                    isFail = true;
                }
            }
            repaint();
        }
        timer.start(); //定时器开始
    }

    @Override
    public void keyTyped(KeyEvent e) {
     }
    @Override
    public void keyReleased(KeyEvent e) {
     }
}

4. 运行结果界面