package com.views

{

    import flash.display.Bitmap;

    import flash.display.MovieClip;

    import flash.display.Sprite;

    import flash.events.Event;

    /**

     * @author:Frost.Yen

     * @E-mail:871979853@qq.com

     * @create:    2016-7-7 下午2:33:56

     *

     */

    public class LogoView extends Sprite

    {

        private var _stageW:Number = 1920;

        private var _stageH:Number = 1080;

        private var _mc:MovieClip = new MovieClip();

        public function LogoView(bmp:Bitmap)

        {

            _mc.addChild(bmp);

            bmp.x = -bmp.width*0.5;

            bmp.y = -bmp.height*0.5;

            initLogo();

        }

        private function initLogo():void{

            //随机位置

            _mc.x = Math.random()*_stageW;

            _mc.y = Math.random()*_stageH;

            //随机速度和方向

            Math.random()>0.5?_mc.speedX = Math.random()*5+1 : _mc.speedX = -1 * Math.random()*5+1

            Math.random()>0.5?_mc.speedY = Math.random()*5+1 : _mc.speedY = -1 * Math.random()*5+1

            //因为logo的坐标原点是logo的中心，所以用该函数用来调整logo位置，防止移出边界

            adjustBall(_mc);

            //添加logo到显示列表

            addChild(_mc);

            //用ENTER_FRAME侦听器使logo运动

            //startMove();

        }

        private function adjustBall(mc:MovieClip):void{

            if(mc.x > _stageW-mc.width/2){mc.x = _stageW-mc.width/2;}

            if(mc.x < mc.width/2){mc.x = mc.width/2};

            if(mc.y > _stageH-mc.height/2){mc.y = _stageH-mc.height/2;}

            if(mc.y < mc.height/2){mc.y = mc.height/2;}

        }

        private function onEnterFrame(evt:Event):void{

            //改变logo的坐标让小球运动

            evt.target.x += evt.target.speedX;

            evt.target.y += evt.target.speedY;

            //检测logo是否碰到舞台边界

            if(evt.target.x >= _stageW-evt.target.width/2 || evt.target.x <= evt.target.width/2){

                evt.target.speedX *= -1;

            }

            if(evt.target.y >= _stageH-evt.target.height/2 || evt.target.y <= evt.target.height/2){

                evt.target.speedY *= -1;

            }

        }

        public function startMove():void

        {

            _mc.addEventListener(Event.ENTER_FRAME,onEnterFrame);

        }

        public function stopMove():void

        {

            _mc.removeEventListener(Event.ENTER_FRAME,onEnterFrame);

        }

    }

}