簡單過生活

package{

    import flash.display.*;

    import flash.events.*

    import flash.utils.Timer;

    public class Snake extends MovieClip{

        var sprite:Sprite=new Sprite();

        var arrSnake:Array=new Array(); 

        var food:MovieClip=new FoodSprite();

        var time:Timer=new Timer(100);

        var numX:Number=1;

        var numY:Number=0;

        var speed:Number=10;        

        const left:Number=37;

        const up:Number=38;

        const right:Number=39;        

        const down:Number=40;

        public function Snake(){

            stop();

            //設定背景為黑色

            graphics.beginFill(0x000000);

            graphics.drawRect(0,0,300,300);

            addChild(sprite);                        

            //建立 snake sprite 

            var snake:SnakeSprite=new SnakeSprite();

            snake.x=100;

            snake.y=100;

            arrSnake.push(snake);        

            sprite.addChild(snake);                                    

            snake=new SnakeSprite();

            snake.x=-10;            

            arrSnake.push(snake);        

            sprite.addChild(snake);    

            //初始 food 

            food.x=250;

            food.y=250;

            sprite.addChild(food);                                    

            //加入鍵盤事件

            stage.addEventListener(KeyboardEvent.KEY_DOWN,key_Down);

            //加入 Timer 事件

            time.addEventListener(TimerEvent.TIMER,GameLoop);

            time.start();                        

        }

        public function GameLoop(e:TimerEvent){

                moveSnake();

                //snake 移動

                arrSnake[0].x=arrSnake[0].x+(numX*speed);

                arrSnake[0].y=arrSnake[0].y+(numY*speed);    

                //如果 snake 移動出畫面邊緣，則遊戲結束

                if(arrSnake[0].x<0 || arrSnake[0].x > 300-10 || arrSnake[0].y<0 || arrSnake[0].y>300-10){

                    end();

                }

                //如果 snake 碰觸到自己，則遊戲結束

                for(var i:int=1;i<arrSnake.length;i++){

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

                        end();                        

                    }

                }

                //snake 吃到 food

                if(arrSnake[0].x == food.x && arrSnake[0].y == food.y){

                    //food 出現的位置，不得與 snake 重疊

                    var isCover:Boolean

                    do{            

                        isCover=false;

                        food.x=Math.floor((Math.random()*300)/10)*10;

                        food.y=Math.floor((Math.random()*300)/10)*10;

                        for(var j:int=0;j<arrSnake.length;j++) {

                            if(arrSnake[j].x == food.x && arrSnake[j].y == food.y){

                                isCover=true;

                                break;

                            }                        

                        }

                    }while(isCover)

                    //建立新的 snake sprite

                    var newSnake:SnakeSprite

                    newSnake=new SnakeSprite();

                    arrSnake.push(newSnake);    

                    newSnake.x=-10;

                    newSnake.y=-10;

                    sprite.addChild(newSnake);

                }                

        }

        //移動貪食蛇

        public function moveSnake(){

            for(var i:int=arrSnake.length-1;i>0;i--) {

                arrSnake[i].x = arrSnake[i-1].x;

                arrSnake[i].y = arrSnake[i-1].y;                

            }

        } 

        //遊戲結束

        public function end(){

            //移除事件

            time.removeEventListener(TimerEvent.TIMER,GameLoop);

            stage.removeEventListener(KeyboardEvent.KEY_DOWN,key_Down);                

            //移除 sprite

            removeChild(sprite);

            //跳到遊戲結束影格

            nextFrame();

        }

        //鍵盤事件 

        public function key_Down(e:KeyboardEvent){

                if(e.keyCode == up){

                    //貪食蛇向下，按下向上方向鍵無效

                    if(numY!=1){ 

                        numX=0;

                        numY=-1;                                                                

                    }

                }

                if(e.keyCode == down){

                    //貪食蛇向上，按下向下方向鍵無效

                    if(numY!=-1){

                        numX=0;

                        numY=1;                        

                    }

                }

                if(e.keyCode == left){

                    //貪食蛇向右，按下向左方向鍵無效

                    if(numX!=1){

                        numX=-1;

                        numY=0;                        

                    }

                }

                if(e.keyCode == right){

                    //貪食蛇向左，按下向右方向鍵無效

                    if(numX!=-1){

                        numX=1;

                        numY=0;                        

                    }

                }

        }

    }

}