移动的云朵

 1 package antCodes
 2 {
 3     import flash.display.Sprite;
 4     import flash.utils.getDefinitionByName;
 5 
 6     public class SampleCloud extends Sprite
 7     {
 8         //笔者习惯以双下划线开头的属性表示与库中元件相关
 9         private var __CloudA:Class;
10         private var __CloudB:Class;
11         private var __Sky:Class;
12         public function SampleCloud() {
13             initView();
14             var sky:Sprite = new __Sky();
15             //三朵云彩，使用基类CloudMovieClip做为类型
16             var cloudABig    :CloudMovieClip = new __CloudA();
17             var cloudASmall    :CloudMovieClip = new __CloudA();
18             var cloudB        :CloudMovieClip = new __CloudB();
19             //分别调整三朵云彩的位置、大小和速度
20             cloudABig.speed = 1.5;
21             cloudABig.x = 300;
22             
23             cloudASmall.speed = 1;
24             cloudASmall.scaleX = 0.5;            
25             cloudASmall.scaleY = 0.5;
26             cloudASmall.x = 200;
27             cloudASmall.y = 125;
28             cloudASmall.alpha = 0.5;
29                         
30             cloudB.y = 150;
31             cloudB.x = 500;
32             cloudB.speed = 0.5;
33             //加入显示列表
34             addChild(sky);
35             addChild(cloudB);
36             addChild(cloudABig);
37             addChild(cloudASmall);            
38         }        
39         private function initView():void {
40             __CloudA = getDefinitionByName("CloudA") as Class;
41             __CloudB = getDefinitionByName("CloudB") as Class;
42             __Sky      = getDefinitionByName("SkySprite") as Class;
43         }
44         
45     }
46 }

 1 package antCodes
 2 {
 3     import flash.display.MovieClip;
 4     import flash.events.Event;
 5     public class CloudMovieClip extends MovieClip
 6     {
 7         private var _speed:Number = 1;
 8         //speed是云彩移动的速度
 9         public function CloudMovieClip(){
10             super();
11             //添加动画效果
12             addEventListener(Event.ENTER_FRAME, move);
13         }
14         public function set speed(nS:Number):void {
15             _speed = nS;
16         }
17         //每帧的云彩移动
18         private function move(evt:Event):void {
19             this.x -= _speed;
20         }        
21     }
22 }