[ActionScript 3.0] AS3虚线绘制方法

import flash.geom.Point;
import flash.display.MovieClip;
import flash.display.Graphics;

var mc:MovieClip=new MovieClip();
addChild(mc);
drawDashed(mc,new Point(100,100),new Point(500,100),5,5);

function drawDashed(mc:Sprite,p1:Point,p2:Point,length:Number=5,gap:Number=5):void
{
    var max:Number = Point.distance(p1,p2);
    var len:Number = 0;
    var p3:Point;
    var p4:Point;
    while(len<max)
    {
        p3 = Point.interpolate(p2,p1,len/max);
        len+=length;
        if(len>max)len=max
        p4 = Point.interpolate(p2,p1,len/max);
        mc.graphics.lineStyle(1,0xff00ff,1)
           mc.graphics.moveTo(p3.x,p3.y)
        mc.graphics.lineTo(p4.x,p4.y)
        len+=gap;
    }
}