package {

import flash.display.Sprite;

import flash.events.TimerEvent;

import flash.utils.Timer;

[SWF(width='800', height='600', backgroundColor='#000000', frameRate='30')]

 

public class Snow extends Sprite {

 

 private var timer:Timer;

 

 public function Snow()

 {

         addChild(new Rect(800, 600, 0, 0, 0x000000));

         timer = new Timer(50);

         timer.addEventListener(TimerEvent.TIMER, onTick);

         timer.start();

 }

 

 private function onTick(evt:TimerEvent):void

 {

         var thisSnow:Snowflake = new Snowflake(0.02, -0.1, 0.3, [new Rect(10, 10, -Math.random() * 100, -Math.random() * 100, 0xDDDDFF)]);

         addChild(thisSnow);

         thisSnow.x = Math.random() * 800;

         thisSnow.y = -20;

 }

}

}

 

import flash.display.Shape;

import flash.display.Sprite;

import flash.events.TimerEvent;

import flash.filters.BlurFilter;

import flash.utils.Timer;

 

internal class Snowflake extends Sprite {

public var speedX:int = 5;

public var speedY:int = 5;

public var speedRotation:int = 5;

 

private var sprite:*;

private var timer:Timer = new Timer(1);

 

private var gravity:Number = 1;

private var wind:Number = 1;

private var scale:Number = 1;

private var speed:Number = 1;

 

 

 

private var step:uint = 1;

 

 

public function Snowflake(gravity:Number = 1,wind:Number = 1,speed:Number = 1,snows:Array = null):void

{

 this.gravity = gravity;

 this.wind = wind;

 this.speed = speed;

 if(snows == null)

 {

         sprite = new Rect(10, 10);

 }

 else

 {

         var snowID:uint = uint(Math.random() * snows.length);

         sprite = snows[snowID];

 }

 addChild(sprite);

 timer.addEventListener(TimerEvent.TIMER, onTick);

 timer.start();

 randoms();

}

 

private function randoms():void

{

 speedX = (Math.random() - Math.random()) * 5;

 speedY = Math.random() * 5 + 1;

 speedRotation = (Math.random() - Math.random()) * 20;

 scale = Math.random();

 if(scale < 0.5) scale = 0.5;

 sprite.scaleX = scale;

 sprite.scaleY = scale;

 sprite.alpha = 0.7 - scale / 1.5;

 var blur:BlurFilter = new BlurFilter(scale * 4, scale * 4, 1);

 sprite.filters = [blur];

}

 

private function onTick(evt:TimerEvent):void

{

 step++;

 sprite.x += speedX + wind * step * sprite.scaleX * speed;

 sprite.y += speedY + gravity * step * sprite.scaleY * speed;

 sprite.rotation += speedRotation * speed;

 if(sprite.y > 1000) 

 {

         parent.removeChild(this);

         timer.stop();

         timer = null;

 }

}

}

 

internal class Rect extends Shape {

 

public function Rect(width:Number, height:Number,x:Number = 0,y:Number = 0,color:uint = 0x0) 

{

 this.graphics.beginFill(color);

 this.graphics.drawRect(x, y, width, height);

}

}