贪吃蛇

贪吃蛇

帧，如果时间片足够小，就是动画，一秒30帧、60帧。

连起来是动画，拆开就是静态的图片！

键盘监听 定时器 Timer

1、定义数据
2、画上去
3、监听事件
    键盘
    事件

package com.hua.snake;

import javax.swing.*;

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

        frame.setBounds(10,10,900,720);
        frame.setResizable(false);//窗口大小不可变
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

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

        frame.setVisible(true);
    }
}

package com.hua.snake;

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

//数据中心
public class Data {

    //相对路径 tx.jpg
    //绝对路径  / 相当于当前的项目
    public  static URL headerURL = Data.class.getResource("static/header.png");
    public static ImageIcon header =  new ImageIcon(headerURL);

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

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

package com.hua.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 25*25
    String fx = "R";
    //食物的坐标
    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;//默认是不开始！

    boolean isFail = false;//游戏失败状态

    //定时器  以ms(毫秒)为单位 1000ms = 1s
    Timer timer = new Timer(100,this);//100毫秒执行一次

    //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();//游戏一开始定时器就启动！
        score = 0;
    }

    //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

        //把食物随机分布在界面上！
        foodx = 25+25*random.nextInt(34);
        foody = 75+25*random.nextInt(24);
    }

    //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
        setBackground(Color.white);
//        Data.header.paintIcon(this,g,25,11); //头部广告栏画上去
        g.fillRect(25,75,850,600);//默认的游戏页面

        //画积分
        g.setColor(Color.CYAN);
        g.setFont(new Font("微软雅黑",Font.BOLD,18));
        g.drawString("分数:"+score,750,20);
        g.drawString("长度:"+length,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]);//蛇头初始化向左,需要通过方向来判断
        }else if(fx.equals("U")){
            Data.up.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向上,需要通过方向来判断
        }else if(fx.equals("D")){
            Data.down.paintIcon(this,g,snakeX[0],snakeY[0]);//蛇头初始化向下,需要通过方向来判断
        }

        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));
            g.drawString("按空格开始游戏",300,300);
        }

        if (isFail==true){
            g.setColor(Color.red);
            g.setFont(new Font("微软雅黑",Font.BOLD,40));
            g.drawString("失败，按下空格重新开始游戏",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){
                isFail = false;
                init();
            }else{
                isStart = !isStart;//取反
            }
            repaint();
        }

        if(keyCode==KeyEvent.VK_UP){
            if(fx!="D"){fx = "U";}
        }else if (keyCode==KeyEvent.VK_DOWN){
            if(fx!="U"){x = "D";}
        }else if (keyCode==KeyEvent.VK_LEFT){
           if(fx!="R"){ fx = "L";}
        }else if (keyCode==KeyEvent.VK_RIGHT){
            if(fx!="L"){fx = "R";}
        }

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

    //事件监听----需要通过固定事件来刷新，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){
                //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
            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;}
            }else if(fx.equals("U")){
                snakeY[0] = snakeY[0]-25;
                if(snakeY[0]<75){snakeY[0] = 650;}//之所以等于650，是因为整个frame是720，这个面板的最底下并不是Frame的最低点，距离Frame的最低点还有25
            }else if(fx.equals("D")){
                snakeY[0] = snakeY[0]+25;
                if(snakeY[0]>650){snakeY[0] = 75;}
            }

            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！
    }
}