GUI编程（三）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

package com.kuang.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("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);
}


package com.kuang.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;//初始方向

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

    boolean isFail = false;//游戏状态失败

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

    //成绩
    int score;

    //定时器，以毫秒为单位 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,游戏中所有的东西，都是用这个画笔来实现
    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);//清屏
        //绘制静态面板
        this.setBackground(Color.WHITE);
        Data.header.paintIcon(this,g,25,11);//头部广告栏画上去
        g.fillRect(25,75,850,600);//默认游戏界面

        //画食物
        Data.food.paintIcon(this,g,foodx,foody);

        //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,750,50);


        //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
        }


        for(int i=1;i<length;i++){
            Data.body.paintIcon(this,g,snakex[i],snakey[i]);//蛇第一个身体坐标
        }


        //游戏状态
        if(isStart == false){
            g.setColor(Color.WHITE);
            //设置字体
            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 == true){
            g.setColor(Color.RED);
            //设置字体
            g.setFont(new Font("微软雅黑",Font.BOLD,40));
            g.drawString("失败，按下空格开始游戏!",300,300);
        }
    }

    //键盘监听事件
    @Override
    public void keyPressed(KeyEvent e) {
        int keyCode = e.getKeyCode();//获取键盘按键是哪一个

        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;
            }
            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-------需要通过固定的事件来刷新
    @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++;//长度加一
                //分数+10
                score = score + 10;
                //重新生成食物
                foodx = 25 + 25*random.nextInt(34);
                foody = 75 + 25*random.nextInt(24);
            }

            //移动
            for(int i = length-1;i>0;i--){//后一节移动到前一节的位置 snake[1] = snake[0];
                snakex[i] = snakex[i-1];//向前移动一节
                snakey[i] = snakey[i-1];
            }
            //走向需要改变
            if(fx.equals("R")){
                snakex[0] = snakex[0]+25;
                //边界判断
                if(snakex[0]>850){  snakex[0] = 25;  }
            }else if(fx.equals("L")){
                snakex[0] = snakex[0]-25;
                //边界判断
                if(snakex[0]<25){  snakex[0] = 850;  }
            }else if(fx.equals("U")){
                snakey[0] = snakey[0]-25;
                //边界判断
                if(snakey[0]<75){  snakey[0] = 650; }
            }else if(fx.equals("D")){
                snakey[0] = snakey[0]+25;
                //边界判断
                if(snakey[0]>650){ snakey[0] = 75;}
            }

            //失败判断，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) { }
}




package com.kuang.Snake;

import javax.swing.*;

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);
    }
}

总结