[ActionScript 3.0] AS3 绘制星形

 package
 {
     import flash.display.Sprite;
     import flash.events.Event;

     /**
      * @author Frost.Yen
      * @E-mail 871979853@qq.com
      * @create 2015-9-9 下午4:47:50
      *
      */
     [SWF(width="1024",height="1024",frameRate="3")]
     public class DrawStar extends Sprite
     {
         public function DrawStar()
         {
             initViews();
             initEventListeners();
         }
         private function initViews():void
         {
             draw();
         }
         private function initEventListeners():void
         {
             this.addEventListener(Event.ENTER_FRAME,onFresh);
         }
         private function onFresh(e:Event):void
         {
             this.removeChildren();
             draw();
         }
         private function draw():void
         {
             for(var i:int=0;i<64;i++){
                 var star:Star = new Star(Math.random()*10+2,50,20,Math.random()*255-Math.random()*0xffffff,Math.random()*0xffffff-Math.random()*255,true);
                 star.x = i%8*100+100;
                 star.y = Math.floor(i/8)*100+100;
                 this.addChild(star);
             }
         }
     }
 }
 import flash.display.Sprite;

 class Star extends Sprite
 {
     private var _b:Boolean;
     private var _x:Number;
     private var _y:Number;
     /**
      *
      * @param    len 星形边数
      * @param    radius1 五角星中心点离较远顶点的距离（可看作五角星外接圆的半径）
      * @param    radius2 五角星中心点离较近顶点的距离（可看作五角星内接圆的半径）
      * @param    lineColor 线条颜色
      * @param    fillColor 填充颜色
      * @param    isFill 是否填充
      */
     public function Star(len:int=5,radius1:Number=50,radius2:Number=20,lineColor:uint=0xff0000,fillColor:uint=0x00ffff,isFill:Boolean=false){
         if(len<=1){
             trace("星形边数至少为2");
             return;
         }
         this.graphics.lineStyle(1,lineColor);
         if(isFill){
             this.graphics.beginFill(fillColor)
         }
         this.graphics.moveTo(radius2,0);
         for(var i:int = 1;i<=len*2;i++){
             _b?[_x=radius2*Math.cos(i*Math.PI*2/(len*2)),_y=radius2*Math.sin(i*Math.PI*2/(len*2))]:[_x=radius1*Math.cos(i*Math.PI*2/(len*2)),_y=radius1*Math.sin(i*Math.PI*2/(len*2))];
             this.graphics.lineTo(_x,_y);
             _b=!_b;
         }
         if(len%2!=0){
             this.rotation = 90;
         }
     }
 }