flex 雪花效果

本人学flex 就这么几天[高手就不要看了]

package {
    import Snow.Snow;
    
    import flash.display.Sprite;

    public class Test extends Sprite
    {
        public function Test()
        {
            var snow:Snow = new Snow();
            stage.addChild(snow);
        }
    }
}
  

  雪花容器

package Snow
{
    import flash.display.Sprite;
    import flash.events.Event;
    
    public class Snow extends Sprite
    {
        public function Snow()
        {

            for(var i:int = 0;i<1000;i++)
            {
                addSnow();
            }
        }
        
        private function addSnow():void
        {
            var sprite: SnowMeta = new SnowMeta();
                    
            sprite.x = Math.random()* 1000;
            sprite.y = Math.random()* 400;
            
            addChild(sprite);
        }
    }
}

雪花 对象

package Snow
{
    import flash.events.Event;
    import flash.text.TextField;
    import flash.text.TextFormat;
    
    public class SnowMeta extends TextField
    {    
        private var step:int = 1;
        
        public function SnowMeta()
        {
            addEventListener(Event.ADDED_TO_STAGE,activection);
            addEventListener(Event.REMOVED_FROM_STAGE , desactivection);
        }
        
        private function activection(e:Event):void
        {
            var  tformat :TextFormat = new TextFormat();
                        
            tformat.color = 0xffffff;            
            defaultTextFormat = tformat;
            text =  ".";
                        
            scaleX*=Math.round(Math.random()*3);
            scaleY*=Math.round(Math.random()*3);            
            
            step = scaleY;
            
            addEventListener(Event.ENTER_FRAME,frame);
        }
        
        private function desactivection(e:Event):void
        {
            removeEventListener(Event.ADDED_TO_STAGE,activection);
            removeEventListener(Event.REMOVED_FROM_STAGE,desactivection);
            removeEventListener(Event.ENTER_FRAME,frame);
        }
        
         private function frame(e:Event):void
         {
            if(x> Math.random()* 1000)
            {
                x -= step;
            }
            else if(x <= 0)
            {
                x = 1000;
            }
            else if(Math.round(Math.random()*2)==2)
            {
                x += step;
            }
            else
            {
                x -= step;    
            }
            
            //吹风效果
             //x-=3;
                         
            y+= 1;
            
            if(y > 400)
                y=0;
         }
    }
}