java 贪吃蛇

贪吃蛇

启动类

package com.snake;

import javax.swing.*;

public class GameStart {
    public static void main(String[] args) {
        JFrame gameFrame = new JFrame("snake");

        GamePanel gamePanel = new GamePanel();

        gameFrame.add(gamePanel);


        gameFrame.setBounds(500,100,900,720);
        gameFrame.setVisible(true);
        gameFrame.setResizable(false);
        gameFrame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }
}

*面板类 （主要功能）

package com.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;

/**
 * 基本步骤
 * 1.定义数据
 * 2.将数据画上去
 * 3.监听事件
 *    键盘
 *    游戏事件
 */

public class GamePanel extends JPanel implements KeyListener, ActionListener {
    //定义蛇的数据
    int length;
    int[] snakeX = new int[800];
    int[] snakeY = new int[800];

    //定义food的数据
    int foodX;
    int foodY;
    public void foodInit(){
        foodX = 25+25*random.nextInt(34);
        foodY = 75+25*random.nextInt(24);
    }
    Random random = new Random();//随机数
    Timer time = new Timer(120,this);//定时器 监听this 100毫秒执行一次
    String direct;//定义方向
    int score;
    boolean isFail = false;//游戏是否失败
    boolean isStart = false;//游戏是否开始

    public GamePanel(){
        init();
        //获得键盘焦点事件
        this.setFocusable(true);//获得焦点事件
        this.addKeyListener(this);//获得键盘监听事件
        time.start();//游戏一开始 定时器就启动
    }

    //初始化方法
    public void init(){
        length = 3;
        snakeX[0] = 100;snakeY[0] = 100;//头坐标
        snakeX[1] = 75;snakeY[1] = 100;//第一节坐标
        snakeX[2] = 50;snakeY[2] = 100;//第二节坐标
        direct = "R";
        //初始化food
        foodInit();
        score = 0;
    }

    //绘制画笔 游戏所有界面都由这画笔画
    @Override
    protected void paintComponent(Graphics g) {
        //清屏 闪烁
        super.paintComponent(g);

        this.setBackground(Color.BLACK);
        //先绘制静态图像
        //Date.head.paintIcon(this,g,25,11);

        g.fillRect(25,75,850,600);
        g.setColor(new Color(0x242467));
        g.fillRect(25,11,850,50);

        //画出food
        Date.food.paintIcon(this,g,foodX,foodY);

        //把蛇画上来
        //画出头
        if (direct.equals("R")){
            Date.right.paintIcon(this,g,snakeX[0],snakeY[0]);//头初始化向右
        }else if (direct.equals("L")){
            Date.left.paintIcon(this,g,snakeX[0],snakeY[0]);
        }else if (direct.equals("U")){
            Date.up.paintIcon(this,g,snakeX[0],snakeY[0]);
        }else if (direct.equals("D")){
            Date.down.paintIcon(this,g,snakeX[0],snakeY[0]);
        }
        //画出身体
        for (int i = 1; i < length; i++) {
            Date.body.paintIcon(this,g,snakeX[i],snakeY[i]);
        }

        //画出分数
        g.setColor(new Color(0x4DD29B));
        g.setFont(new Font("宋体",Font.BOLD,45));
        g.drawString("分数："+score,150,50);

        //画出长度
        g.setColor(new Color(0x4DD29B));
        g.setFont(new Font("宋体",Font.BOLD,45));
        g.drawString("长度："+length,550,50);

        //画出失败提示
        if (isFail == true){
            g.setColor(Color.red);
            g.setFont(new Font("宋体",Font.BOLD,30));//设置字体 Font.BOLD加粗
            g.drawString("失败！按下空格重新开始游戏",250,350);

        }

        //画出启停提示
         if (isStart == false){
             g.setColor(Color.ORANGE);
             g.setFont(new Font("宋体",Font.BOLD,20));//设置字体 Font.BOLD加粗
             g.drawString("按下空格",405,330);
             g.setFont(new Font("宋体",Font.BOLD,30));//设置字体 Font.BOLD加粗
             g.drawString("开始|继续",370,370);
         }
    }


    //键盘监听
    @Override
    public void keyPressed(KeyEvent e) {
        int keyCode = e.getKeyCode();//获取按压的是哪个键
        if(keyCode == KeyEvent.VK_SPACE){//按压空格
            if (isFail){
                //重新开始
                isFail = false;
                init();
            }else {
                isStart = !isStart;
            }
            repaint();
        }
        if(keyCode == KeyEvent.VK_UP){
            if (direct != "D"){ //防止回头
                direct = "U";
            }
        } else if (keyCode == KeyEvent.VK_DOWN) {
            if (direct != "U"){
                direct = "D";
            }
        }else if (keyCode == KeyEvent.VK_LEFT) {
            if (direct != "R"){
                direct = "L";
            }
        }else if (keyCode == KeyEvent.VK_RIGHT) {
            if (direct != "L"){
                direct = "R";
            }
        }
    }

    //事件监听
    @Override
    public void actionPerformed(ActionEvent e) {
        if (isStart == true && isFail == false){
            //吃食物
            if (snakeX[0] == foodX && snakeY[0] == foodY){
                length++;
                foodInit();//food刷新
                score += 10;
            }
            //移动
            for (int i = length-1 ; i > 0; i--) { //后面一节往前移一节
                snakeX[i] = snakeX[i-1];
                snakeY[i] = snakeY[i-1];
            }
            if (direct.equals("R")){
                snakeX[0] = snakeX[0]+25;
                if (snakeX[0] > 850){
                    snakeX[0] = 25;
                }//边界判断
            } else if (direct.equals("L")) {
                snakeX[0] -= 25;
                if (snakeX[0] < 25){
                    snakeX[0] = 850;
                }//边界判断
            } else if (direct.equals("U")) {
                snakeY[0] -= 25;
                if (snakeY[0] < 75){
                    snakeY[0] = 650;
                }//边界判断
            } else if (direct.equals("D")) {
                snakeY[0] += 25;
                if (snakeY[0] > 650){
                    snakeY[0] = 75;
                }//边界判断
            }

            //速度设置
            if (length >= 15){
                time.setDelay(140);
            } else if (length > 15 && length <= 20) {
                time.setDelay(170);
            } else if (length > 20 && length <= 25) {
                time.setDelay(215);
            } else if (length > 25 && length <= 30) {
                time.setDelay(250);
            } else if (length > 30 && length <= 35) {
                time.setDelay(300);
            } else if (length > 35 && length <= 40) {
                time.setDelay(330);
            } else if (length > 40 && length <= 45) {
                time.setDelay(360);
            } else if (length > 45 && length <= 50) {
                time.setDelay(380);
            } else if (length > 50 && length <= 55) {
                time.setDelay(400);
            } else if (length > 55 && length <= 60) {
                time.setDelay(420);
            }

            //失败判断 撞到自己就结束
            for (int i = 1; i < length; i++) {
                if (snakeX[0] == snakeX[i] && snakeY[0] == snakeY[i]){
                    isFail = true;
                }
            }
            repaint();//重画
        }
        time.start();//定时器开始
    }
    @Override
    public void keyReleased(KeyEvent e) {

    }
    @Override
    public void keyTyped(KeyEvent e) {

    }
}

素材类

package com.snake;

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

public class Date {
    //添加界面及身体元素 图标
    public static URL headURL = Date.class.getResource("picture/head.png");
    public static ImageIcon head =  new ImageIcon(headURL);
    public static URL foodURL = Date.class.getResource("picture/food.png");
    public static ImageIcon food =  new ImageIcon(foodURL);
    public static URL bodyURL = Date.class.getResource("picture/body.png");
    public static ImageIcon body =  new ImageIcon(bodyURL);
    public static URL upURL = Date.class.getResource("picture/up.png");
    public static ImageIcon up =  new ImageIcon(upURL);
    public static URL downURL = Date.class.getResource("picture/down.png");
    public static ImageIcon down =  new ImageIcon(downURL);
    public static URL leftURL = Date.class.getResource("picture/left.png");
    public static ImageIcon left =  new ImageIcon(leftURL);
    public static URL rightURL = Date.class.getResource("picture/right.png");
    public static ImageIcon right =  new ImageIcon(rightURL);

}

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