flex 雪花效果

本人学flex 就这么几天[高手就不要看了]

 1 package {
 2     import Snow.Snow;
 3     
 4     import flash.display.Sprite;
 5 
 6     public class Test extends Sprite
 7     {
 8         public function Test()
 9         {
10             var snow:Snow = new Snow();
11             stage.addChild(snow);
12         }
13     }
14 }

雪花容器

 1 package Snow
 2 {
 3     import flash.display.Sprite;
 4     import flash.events.Event;
 5     
 6     public class Snow extends Sprite
 7     {
 8         public function Snow()
 9         {
10 
11             for(var i:int = 0;i<1000;i++)
12             {
13                 addSnow();
14             }
15         }
16         
17         private function addSnow():void
18         {
19             var sprite: SnowMeta = new SnowMeta();
20                     
21             sprite.x = Math.random()* 1000;
22             sprite.y = Math.random()* 400;
23             
24             addChild(sprite);
25         }
26     }
27 }

雪花对象

 1 package Snow
 2 {
 3     import flash.events.Event;
 4     import flash.text.TextField;
 5     import flash.text.TextFormat;
 6     
 7     public class SnowMeta extends TextField
 8     {    
 9         private var step:int = 1;
10         
11         public function SnowMeta()
12         {
13             addEventListener(Event.ADDED_TO_STAGE,activection);
14             addEventListener(Event.REMOVED_FROM_STAGE , desactivection);
15         }
16         
17         private function activection(e:Event):void
18         {
19             var  tformat :TextFormat = new TextFormat();
20                         
21             tformat.color = 0xffffff;            
22             defaultTextFormat = tformat;
23             text =  ".";
24                         
25             scaleX*=Math.round(Math.random()*3);
26             scaleY*=Math.round(Math.random()*3);            
27             
28             step = scaleY;
29             
30             addEventListener(Event.ENTER_FRAME,frame);
31         }
32         
33         private function desactivection(e:Event):void
34         {
35             removeEventListener(Event.ADDED_TO_STAGE,activection);
36             removeEventListener(Event.REMOVED_FROM_STAGE,desactivection);
37             removeEventListener(Event.ENTER_FRAME,frame);
38         }
39         
40          private function frame(e:Event):void
41          {
42             if(x> Math.random()* 1000)
43             {
44                 x -= step;
45             }
46             else if(x <= 0)
47             {
48                 x = 1000;
49             }
50             else if(Math.round(Math.random()*2)==2)
51             {
52                 x += step;
53             }
54             else
55             {
56                 x -= step;    
57             }
58             
59             //吹风效果
60              //x-=3;
61                          
62             y+= 1;
63             
64             if(y > 400)
65                 y=0;
66          }
67     }
68 }