贪吃蛇V1.0

贪吃蛇游戏开发详解

注意以下问题：

1.蛇移动算法。

蛇所有节点存放到数组。每次移动的时候。把节点的坐标设为其前面节点的坐标。最后在把头的坐标往前移动。坐标一直在往前移。

2.随机生成食物时，在蛇蛇身上时候，要重新生成（递归调用）。

3.把游戏区域分成若干个网格，蛇移动距离为网格单元大小，食物生成在网格中。

点击此试玩游戏(csdn服务器太垃圾。多刷新几次)

点击下载源代码

 代码如小：

一：游戏开始

package com.lux

... {

    import flash.display.*;

    import flash.events.Event;

    import flash.events.MouseEvent;

    import fl.controls.*;    

    public class GameStart extends MovieClip

    ...{ 

        public static var gamestart:MovieClip ;

        private var _score:Number=0; 

        //=====游戏所用时间

        private var time:Number ;

        public function GameStart()

        ...{     

            super();  

            gamestart = this ; 

            play_btn.addEventListener(MouseEvent.CLICK,playGame); 

        }  

        public function playGame(e:MouseEvent):void...{ 

           this.gotoAndStop("two_tag");   

        } 

        public function replayGame(e:MouseEvent):void...{

             score_mc.score_txt.text = "0" ; 

             timer_mc.min_mc.text ="00" ;

             timer_mc.sec_mc.text ="00" ;

             this.gotoAndStop("two_tag");    

        }

        public function addScore(_score:Number)...{

            this._score+=_score ;  

            score_mc.score_txt.text = this._score.toString();  

        }

        public function getScore():Number...{

            return this._score ; 

        }

//        public function timerStop():void{

//            timer_mc.remove(); 

//        }

//        

    }

}

二：蛇移动的管理

package  com.lux

... {

    import de.polygonal.ds.NullIterator;

    import flash.display.MovieClip;

    import flash.events.Event;

    import flash.events.KeyboardEvent;

    import flash.events.TimerEvent;

    import flash.filters.BevelFilter;

    import flash.ui.Keyboard;

    import flash.utils.Timer;

    public class DaShe extends MovieClip ...{ 

       //蛇节点数组 

        private var a:Array ;

        //方向 

        private var up:uint =    1 ;

        private var down:uint =  2 ;

        private var left:uint =  3 ;

        private var right:uint = 4 ;

        //====保存随机生成的蛇  

        private var _newShe:XiaoShe ;  

        //====方向 

        private var _dir:uint ;  

        private var timer:Timer ;   

        private var _score:Number=0 ;

        public function DaShe() ...{       

            super();    

            this._dir = this.right ; 

            a = new Array();

            //蛇初始化为两条小蛇的长度。               

            var head:XiaoShe = new XiaoShe(30,30);          

            a.push(head);       

            this.addChild(head);  

            var head1:XiaoShe = new XiaoShe(head.x-head.width,head.y);

            a.push(head1);      

            this.addChild(head1);       

        }        

        public function start():void...{ 

             timer = new Timer(100);

             timer.addEventListener(TimerEvent.TIMER,running);

             timer.start();  

            //===注册方向控制                  

            this.stage.addEventListener(KeyboardEvent.KEY_DOWN,direction);

            //===随机生成新蛇 

            this.initFood();   

        }                     

        private function running(e:Event):void...{                                          

            for(var i:uint=a.length-1;i>0;i--)...{ 

                a[i].x =a[i-1].x;    

                a[i].y =a[i-1].y;  

            }    

            switch(_dir)...{ 

                case this.up:

                     a[0].y-=this._SPEED;

                     break;

                case this.left:

                     a[0].x-=this._SPEED;

                     break;         

                case this.down:

                     a[0].y+=this._SPEED; 

                     break;       

                case this.right:   

                     a[0].x+=this._SPEED ;                   

            } 

            //==========碰到食物 

            if(isEat())...{ 

                eatFood();      

                //增加积分

               // this.addScore();  

               GameStart.gamestart.addScore(1);

            } 

            if(isDead())...{

                this.gameOver() ; 

            }           

        } 

//         

//        private function addScore():void{

//            this._score++;         

//            score_mc.score_txt.text = this._score.toString();

//        }

        private function isDead():Boolean ...{   

            if(a[0].x<=0||a[0].x>=this._ACTIVEWIDTH||a[0].y<=0||a[0].y>=this._ACTIVEHEIGHT)...{

                return true ;

            }       

            for(var i:uint=1;i<a.length;i++)...{   

                if((a[0].x==a[i].x) &&(a[0].y==a[i].y))

                    return true ;

            } 

            return false ;  

        }

        public function gameOver():void...{

            trace("游戏结束");            

            timer.stop();        

            timer.removeEventListener(TimerEvent.TIMER,running);

            this.stage.removeEventListener(KeyboardEvent.KEY_DOWN,direction);   

            this.parent.removeChild(this); 

            GameStart.gamestart.gotoAndStop("gameover_tag");  

            // GameStart.gamestart.timerStop();        

        } 

        public function eatFood():void...{ 

            var _newshe:XiaoShe = new XiaoShe(a[a.length-1].x,a[a.length-1].y);

            a.push(_newshe);   

            this.randomLocation();

            this.addChild(_newshe);   

        } 

        public function isEat():Boolean...{

            if((a[0].x==this._newShe.x)&&(a[0].y==this._newShe.y))...{ 

                return true ;

            } 

            return false ;

        }

        //==============方向控制 

        private function direction(e:KeyboardEvent):void...{ 

            trace("有按键事件");

            switch(e.keyCode)...{

                case Keyboard.DOWN:

                     if(_dir!=this.up)

                        _dir = this.down ;    

                     break ;

                case Keyboard.RIGHT:  

                     if(_dir!=this.left)

                        _dir = this.right ;

                     break;

                case Keyboard.UP:

                     if(_dir!=this.down)

                        _dir =this.up ;

                     break;  

                case Keyboard.LEFT:

                     if(_dir!=this.right)

                        _dir =this.left ;                

            }         

        } 

        private function initFood():void...{

            _newShe = new XiaoShe(0,0); 

            //===随机生成位置      

            this.randomLocation();          

            this.addChild(_newShe);    

        }         

        //==============重新随机移动蛇的位置。      

        private function randomLocation():void...{                          

            var _x:Number = Math.floor(Math.random()*30)*10 ;

            var _y:Number = Math.floor(Math.random()*40)*10 ;   

            trace("x:"+_x+","+"y:"+_y);

            if(check(_x,_y))...{ 

                trace("生成的小蛇和蛇身重合");

                this.randomLocation();

            }else...{

                this._newShe.x=_x ;

                this._newShe.y=_y ;

            }        

        }      

        private function check(_x:Number,_y:Number):Boolean...{

            for(var i:uint;i<a.length;i++)...{     

                if((_x==a[i].x) && (_y==a[i].y)||(_x==0)||(_y==0)||(_x==300)||(_y==400))...{ 

                    trace("x==="+_x+","+"y=="+_y);

                    return true ;       

                } 

            } 

            return false ;    

        }

        //====蛇移动速度            

        private var _SPEED:uint =10 ;      

        //====食物的大小  

        private var _FWIDTH = 10 ;   

        //====蛇活动窗口宽度

        private var _ACTIVEWIDTH = 300 ;

        //====蛇活动窗口高度

        private var _ACTIVEHEIGHT = 400;

    }

}

三：计时器

package com.lux

... {

    import flash.display.MovieClip;

    import flash.events.TimerEvent;

    import flash.text.TextField;

    import flash.utils.Timer;

    public class TimerUtil extends MovieClip...{

        private var _sec:Number=0 ;

        private var _min:Number=0

        var time:Timer ;    

        public function TimerUtil()...{ 

            super();  

        }  

        public function start():void...{ 

            time = new Timer(1000) ;

            time.addEventListener(TimerEvent.TIMER,change);

            time.start();

        }    

        public function remove():void...{

            time.stop();         

            this.removeEventListener(TimerEvent.TIMER,change); 

            this._sec =0;

            this._min =0;

        } 

        private function change(e:TimerEvent):void...{

            //trace("计时器:"+_sec); 

            _sec++;            

            if(_sec>60)...{       

                _min++;     

                if(_min<10)...{

                    min_mc.text = "0"+_min.toString();

                } 

                else...{

                    min_mc.text=_min.toString() ;

                } 

                _sec=0 ;   

            }

            if(_sec<10)...{ 

                 sec_mc.text ="0"+_sec.toString() ;   

            }else...{ 

                 sec_mc.text=_sec.toString() ; 

            }

        }

    }

}

 四：节点，也叫食物

package com.lux

... {

    import flash.display.MovieClip;

    public class XiaoShe extends MovieClip...{

        //蛇的方向    

        public function XiaoShe(x:Number,y:Number)...{

            super();   

            this.x = x ;

            this.y = y ; 

        }                      

    }

}