标题：FLASH AS3 画扇形函数
出处：BIWEB开源PHP WMS系统创始人ArthurXF肖飞的blog
时间：Wed, 23 Jul 2008 11:55:57 +0000
作者：ArthurXF
地址：http://www.bizeway.net/read.php/344.htm

内容：
/**Create by Geordi 14th Feb 2008*function DrawSector is drawing a sector in the flash by actionscript 3 */import flash.display.MovieClip;import flash.display.Sprite;var stag:Sprite=new Sprite();addChild(stag);var moviec:MovieClip=new MovieClip;stag.addChild(moviec);var S_angle:int=60; 
/* S_angle is expressed as a number between 0 and 360 degrees. it will draw a 60 * degree sector in this example, but you could change it to what ever you want 
*/DrawSector(moviec,200,200,100,S_angle,270,0xffcc00);
function DrawSector(mc:MovieClip,x:Number=200,y:Number=200,r:Number=100,
angle:Number=27,startFrom:Number=270,color:Number=0xff0000):void
/** mc the movieclip: the container of the sector.* x,y the center position of the sector* r the radius of the sector* angle the angle of the sector* startFrom the start degree counting point : 270 top, 180 left, 0 right, 90 bottom , 
* it is counting from top in this example. * color the fil lin color of the sector*/{
/* start to fill the sector with the variable "color" if you want a sector without filling color ,
* please remove next line below.
*/mc.graphics.beginFill(color,50); //remove this line to unfill the sector
/* the border of the secetor with color 0xff0000 (red) , you could replace it with any color 
* you want like 0x00ff00(green) or 0x0000ff (blue).*/
mc.graphics.lineStyle(0,0xff0000); 
mc.graphics.moveTo(x,y);angle=(Math.abs(angle)>360)?360:angle;var n:Number=Math.ceil(Math.abs(angle)/45);var angleA:Number=angle/n;angleA=angleA*Math.PI/180;startFrom=startFrom*Math.PI/180;mc.graphics.lineTo(x+r*Math.cos(startFrom),y+r*Math.sin(startFrom));for(var i=1;i<=n;i++){startFrom+=angleA;var angleMid=startFrom-angleA/2;var bx=x+r/Math.cos(angleA/2)*Math.cos(angleMid);var by=y+r/Math.cos(angleA/2)*Math.sin(angleMid);var cx=x+r*Math.cos(startFrom);var cy=y+r*Math.sin(startFrom);mc.graphics.curveTo(bx,by,cx,cy);}if(angle!=360)mc.graphics.lineTo(x,y);
mc.graphics.endFill(); // if you want a sector without filling color , please remove this line.}
////////////////////////////////////////runing result////////////////////////////////////////////////////////
sector with fill in color: sector without fill in color: 



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