[ActionScript 3.0] AS3 绘制星形

 1 package
 2 {
 3     import flash.display.Sprite;
 4     import flash.events.Event;
 5     
 6     /**
 7      * @author Frost.Yen
 8      * @E-mail 871979853@qq.com
 9      * @create 2015-9-9 下午4:47:50
10      *
11      */
12     [SWF(width="1024",height="1024",frameRate="5")]
13     public class DrawStar extends Sprite
14     {
15         public function DrawStar()
16         {
17             initViews();
18             initEventListeners();
19         }
20         private function initViews():void
21         {
22             draw();
23         }
24         private function initEventListeners():void
25         {
26             this.addEventListener(Event.ENTER_FRAME,onFresh);
27         }
28         private function onFresh(e:Event):void
29         {
30             this.removeChildren();
31             draw();
32         }
33         private function draw():void
34         {
35             for(var i:int=0;i<64;i++){
36                 var star:Star = new Star(Math.random()*10+2,50,20,Math.random()*255-Math.random()*0xffffff,Math.random()*0xffffff-Math.random()*255,true);
37                 star.x = i%8*100+100;
38                 star.y = Math.floor(i/8)*100+100;
39                 this.addChild(star);
40             }
41         }
42     }
43 }
44 import flash.display.Sprite;
45 
46 class Star extends Sprite
47 {
48     private var _b:Boolean;
49     private var _x:Number;
50     private var _y:Number;
51     public function Star(len:int=5,radius:Number=50,dis:Number=20,lineColor:uint=0xff0000,fillColor:uint=0x00ffff,isFill:Boolean=false){
52         if(len<=1){
53             trace("星形边数至少为2");
54             return;
55         }
56         this.graphics.lineStyle(1,lineColor);
57         if(isFill){
58             this.graphics.beginFill(fillColor)
59         }
60         this.graphics.moveTo(dis,0);
61         for(var i:int = 1;i<=len*2;i++){
62             _b?[_x=dis*Math.cos(i*Math.PI*2/(len*2)),_y=dis*Math.sin(i*Math.PI*2/(len*2))]:[_x=radius*Math.cos(i*Math.PI*2/(len*2)),_y=radius*Math.sin(i*Math.PI*2/(len*2))];
63             this.graphics.lineTo(_x,_y);
64             _b=!_b;
65         }
66         if(len%2!=0){
67             this.rotation = 90;
68         }
69     }
70 }