贪吃蛇蛇

package com.back.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;

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[600];//蛇的y// 坐标 25*25
String fx;
//食物的坐标
int foodx;
int foody;
Random random = new Random();
int score;//成绩

//游戏当前状态：开始 停止
boolean isStart = false;//默认是不开始
boolean isFail = false;

//计时器
Timer timer = new Timer(100,this);//100毫秒执行一次
//构造量
public GamePanel() {
    init();
    //获得焦点和键盘事件
    this.setFocusable(true);//获得焦点事件1
    this.addKeyListener(this);//获得键盘监听器
    timer.start();
}

//初始化方法
public void init(){
    //单位是像素，25px一个单位
    length = 3;
    snakeX[0] = 100;snakeY[0] = 100;//脑袋坐标
    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在此面板
@Override
protected void paintComponent(Graphics g) {
    super.paintComponents(g);//清屏
    //绘制静态面板
    this.setBackground(Color.pink);
    g.fillRect(25, 75, 850, 600);//默认游戏界面
    //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);

    //把小蛇挂上去，食物
    data.right.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]);
    }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]);//蛇头初始化向右，需要通过方向来判断
    }else if (fx.equals("U")) {
        data.up.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("D")) {
        data.down.paintIcon(this, g, snakeX[0], snakeY[0]);//蛇头初始化向右，需要通过方向来判断
    }

    data.food.paintIcon(this,g,foodx,foody);

    //游戏状态
    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);
    }
    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",300,300);
    }
}

@Override
public void keyTyped(KeyEvent e) {

}

//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){
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”;
}
}

@Override
public void keyReleased(KeyEvent e) {

}
//事件监听
@Override
public void actionPerformed(ActionEvent e) {
    //吃食物
    if (snakeX[0] == foodx && snakeY[0] == foody){
        length++;//长度加1
        score = score + 10;
        //再次随机生成食物
        foodx = 25 + 25*random.nextInt(34);
        foody = 75 + 25*random.nextInt(24);
    }

    if(isStart && isFail == false){//如果游戏是开始状态，就让小蛇动起来
        //右移
        for (int i = length-1;i>0;i--){
            snakeX[i] = snakeX[i-1];
            snakeY[i] = snakeY[i-1];
        }
        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; }
        } 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; }
        }
        //失败判断，撞到自己算失败
        for (int i = 1; i< length ; i++){
            if (snakeX[0]==snakeX[i]&&snakeY[0]==snakeY[i]){
                isFail = true;
            }
        }
        repaint();//重画页面
    }

}

}