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//ËÄÖÖ·½ÏòÐÄÐÎÏß
 r=a*(1+cos(angle))
 r=a*(1-cos(angle))
 r=a*(1+sin(angle))
 r=a*(1-sin(angle))
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Õâ´ÎÎÒÃÇʹÓõÄPointÀ൱ÖÐÒ»¸ö¼«×ø±êת»»µÄ·½·¨À´Ãèµã¡£
var point:Point=Point.polar(r,angle);//¼«×ø±êת»»µÑ¿¨¶û×ø±ê
Õâ¸ö·½·¨¿ÉÒÔ½«¼«×ø±êת»»ÎÒÃdz£ÓõÄ×ø±êϵ¡£ÕâÑùÎÒÃÇ¿ÉÒÔÀûÓûæͼapi Ãè»æÿһ¸öµã¡£
ÎÒÃÇÀûÓÃÕâ¸ö·½·¨£¬½«Ëû×öÒ»¸ö¼òµ¥Ãèµã¶¯»­¡£ÈçÏ´úÂë
ÆäÖÐÿһ¸ö¹«Ê½ÀïÃæÐÄÐεķ½ÏòÒ²²»»áÏàͬµÄ¡£
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package
{
//ËÄÖÖ·½ÏòÐÄÐÎÏß
//r=a*(1+cos(angle))
//r=a*(1-cos(angle))
//r=a*(1+sin(angle))
//r=a*(1-sin(angle))
import flash.display.Sprite;
import flash.events.*;
import flash.geom.Point;
import flash.display.Graphics;
import flash.display.Bitmap;
import flash.display.BitmapData;
public class Main extends Sprite
{
private var pen:Sprite=new Sprite();
private var bmp:BitmapData;
private var n:int=0;//ÊýÁ¿
private var maxStep:int=100;

public function Main()
{
addChild(pen);
addEventListener(Event.ENTER_FRAME,Run);
}
//»æÖÆÐÄÐÎÏß
private function Run(event:Event):void
{

(n<=maxStep) ? drawHeart(n,100,new Point(250,200)) : stopDraw();
n++;
}

//Í£Ö¹»æÖÆ
private function stopDraw():void
{
removeEventListener(Event.ENTER_FRAME,Run);
trace("Í£Ö¹");
}

//»æÖÆÐÄÐÎ
private function drawHeart(num:int,radius:Number,p:Point):void
{
var angle:Number =2*Math.PI /maxStep * num;
var r:Number = radius*(1+Math.sin(angle));//¹«Ê½
var point:Point=Point.polar(r,angle);//¼«×ø±êת»»µÑ¿¨¶û×ø±ê


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