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Java实现简单的贪吃蛇小游戏

本文实例为大家分享了java实现简单的贪吃蛇小游戏的具体代码,供大家参考,具体内容如下

1. 程序结构

程序结构图如图:

2. 程序设计思路

2.1 data类

作用:连接statics文件夹,将静态资源包中的图片转化为图标 方便在面板上绘制。

实现:使用class.getresource(string path)方法。

代码如下:

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package com.snake;

import javax.swing.*;

import java.net.url;

public class data {

     //贪吃蛇头部

     public static url upurl = data. class .getresource( "/statics/up.png" );

     public static imageicon up = new imageicon(upurl);

     public static url downurl = data. class .getresource( "/statics/down.png" );

     public static imageicon down = new imageicon(downurl);

     public static url lefturl = data. class .getresource( "/statics/left.png" );

     public static imageicon left = new imageicon(lefturl);

     public static url righturl = data. class .getresource( "/statics/right.png" );

     public static imageicon right = new imageicon(righturl);

     //贪食蛇身体

     public static url bodyurl = data. class .getresource( "/statics/body.png" );

     public static imageicon body = new imageicon(bodyurl);

     //食物

     public static url foodurl = data. class .getresource( "/statics/food.png" );

     public static imageicon food = new imageicon(foodurl);

}

2.2 startgame类

作用:创建游戏窗口,在窗口中添加一个游戏面板。
实现:使用jframe类创建游戏窗口,利用其add()方法添加一个gamepanel类实例化对象。

代码如下:

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package com.snake;

import javax.swing.*;

import java.awt.*;

public class startgame {

     public static void main(string[] args){

         //建立游戏窗口

         jframe frame = new jframe( "java-贪吃蛇小游戏" ); //标题

         frame.setsize( 900 , 720 ); //窗口大小

         frame.setlocationrelativeto( null ); //窗口显示屏幕中间

         frame.setresizable( false ); //固定窗口大小

         frame.setdefaultcloseoperation(jframe.exit_on_close); //设置窗体关闭事件

         frame.add( new gamepanel()); //添加游戏内容

         frame.setvisible( true ); //设置窗体可见

     }

}

2.3 gamepanel类

作用: 实现游戏的动态页面。

实现:

(1)init()方法:初始化小蛇位置;
(2)eat()方法:用随机种子随机食物的位置,并进行判定,食物位置不能和小蛇位置重合;
(3)继承jpanel类,重写paintcomponent(graphics g)方法,在方法中绘制标题栏、小蛇的位置(根据direction小蛇头部方向变量绘制小蛇头部)、小蛇身体、积分栏、游戏提醒项与失败判断项;
(4)实现keylistener 接口中的keypressed(keyevent e)方法,获取键盘输入,根据键盘输入对游戏状态或者小蛇头部方向direction变量进行更改;
(5)实现actionlistener接口中的actionperformed(actionevent e)方法,根据游戏状态和direction变量进行小蛇移动操作(注意禁用直接回头操作),进行吃食物判定和死亡判定。使用timer计时器让游戏动态变化,用repaint()方法实时更新界面。

代码如下:

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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;

 

public class gamepanel extends jpanel implements keylistener, actionlistener {

     int [] snakex = new int [ 500 ]; //贪吃蛇横坐标

     int [] snakey = new int [ 500 ]; //贪吃蛇纵坐标

     int foodx; //食物横坐标

     int foody; //食物蛇纵坐标

     int length; //贪吃蛇的长度

     string  direction; //贪吃蛇头方向

     int score; //积分

     random r = new random();

     timer timer = new timer( 100 , this );

     boolean isstart;

     boolean isfail;

     //构造函数

     public gamepanel(){

         init();

         this .setfocusable( true );

         this .addkeylistener( this );

         timer.start();

     }

     private void init(){

         length= 3 ;

         snakex[ 0 ]= 100 ;snakey[ 0 ]= 100 ;

         snakex[ 1 ]= 75 ;snakey[ 1 ]= 100 ;

         snakex[ 2 ]= 50 ;snakey[ 2 ]= 100 ;

         direction = "r" ;

         eat(foodx,foody);

         isstart = false ;

         isfail = false ;

         score = 0 ;

 

     }

     private void eat( int x, int y){

         x= 25 + 25 *r.nextint( 34 );

         y= 75 + 25 *r.nextint( 24 );

         for ( int i = 0 ; i < length; i++) {

             if (snakex[i]==x&&snakey[i]==y){

                 x = 25 + 25 *r.nextint( 34 );

                 y = 75 + 25 *r.nextint( 24 );

             }

         }

         foodx = x;foody = y;

     }

     protected void paintcomponent(graphics g) {

         super .paintcomponent(g);

         this .setbackground(color.white); //设置背景板为白色

         //画标题

         g.setcolor(color.green);

         g.setfont( new font( "幼圆" ,font.bold, 50 ));

         g.drawstring( "贪吃蛇游戏" , 300 , 60 );

         //绘制游戏区域

         g.setcolor(color.gray);

         g.fillrect( 25 , 75 , 850 , 600 );

         //画贪吃蛇头部

         if (direction== "r" ){

             data.right.painticon( this ,g,snakex[ 0 ],snakey[ 0 ]);

         }

         else if (direction== "l" ){

             data.left.painticon( this ,g,snakex[ 0 ],snakey[ 0 ]);

         }

         if (direction== "u" ){

             data.up.painticon( this ,g,snakex[ 0 ],snakey[ 0 ]);

         }

         else if (direction== "d" ){

             data.down.painticon( this ,g,snakex[ 0 ],snakey[ 0 ]);

         }

         //画身体

         for ( int i = 1 ; i < length ; i++) {

             data.body.painticon( this ,g,snakex[i],snakey[i]);

         }

         //画食物

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

         //绘制积分栏

         g.setcolor(color.black);

         g.setfont( new font( "幼圆" ,font.bold, 20 ));

         g.drawstring( "长度:" +length, 730 , 30 );

         g.drawstring( "得分:" +score, 730 , 60 );

         //游戏开始提醒

         if (isstart== false ){

             g.setcolor(color.black);

             g.setfont( new font( "幼圆" ,font.bold, 40 ));

             g.drawstring( "按空格键开始游戏" , 300 , 300 );

         }

         //失败判断

         if (isfail){

             g.setcolor(color.red);

             g.setfont( new font( "幼圆" ,font.bold, 40 ));

             g.drawstring( "游戏失败,按空格键重新开始" , 300 , 300 );

         }

     }

 

     @override

     public void keypressed(keyevent e) {

         int keycode = e.getkeycode(); //获取按下的按键

         //判断空格

         if (keycode==keyevent.vk_space){

             if (isfail){

                 isfail = false ;

                 init();

             }

             else {

                 isstart = !isstart;

             }

             repaint();

         }

         //判断方向

         if (keycode==keyevent.vk_left&&direction!= "r" ){

             direction = "l" ;

         }

         else if (keycode==keyevent.vk_right&&direction!= "l" ){

             direction = "r" ;

         }

         else if (keycode==keyevent.vk_up&&direction!= "d" ){

             direction = "u" ;

         }

         else if (keycode==keyevent.vk_down&&direction!= "u" ){

             direction = "d" ;

         }

     }

     @override

     public void keyreleased(keyevent e) {

 

     }

     @override

     public void keytyped(keyevent e) {

     }

 

 

     @override

     public void actionperformed(actionevent e) {

         //判断游戏状态

         if (isstart&&!isfail){

             //移动身体

             for ( int i = length- 1 ; i > 0 ; i--) {

                 snakex[i] = snakex[i- 1 ];

                 snakey[i] = snakey[i- 1 ];

             }

             //移动头部

             if (direction== "r" ){

                 snakex[ 0 ] += 25 ;

                 if (snakex[ 0 ]> 850 ){

                     snakex[ 0 ] = 25 ;

                 }

             }

             else   if (direction== "l" ){

                 snakex[ 0 ] -= 25 ;

                 if (snakex[ 0 ]< 25 ){

                     snakex[ 0 ] = 850 ;

                 }

             }

             else   if (direction== "u" ){

                 snakey[ 0 ] -= 25 ;

                 if (snakey[ 0 ]< 75 ){

                     snakey[ 0 ] = 650 ;

                 }

             }

             else   if (direction== "d" ){

                 snakey[ 0 ] += 25 ;

                 if (snakey[ 0 ]> 650 ){

                     snakey[ 0 ] = 75 ;

                 }

             }

             //吃食物

             if (snakex[ 0 ]==foodx&&snakey[ 0 ]==foody){

                 length++;

                 score += 10 ;

                 eat(foodx,foody);

             }

             //死亡判定

             for ( int i = 1 ; i < length; i++) {

                 if (snakex[ 0 ]==snakex[i]&&snakey[ 0 ]==snakey[i]){

                     isfail= true ;

                 }

             }

             repaint();

         }

         timer.start();

     }

}

3. 游戏展示

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持。

原文链接:https://blog.csdn.net/xfjssaw/article/details/115708947

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