Custom Class for 'Dashed Line' in AS3

Posted on 2009-07-14
Last Modified: 2013-11-11
Hi all, I am trying to create a custom class for Dashed Line.
I have the attached code in .as file and thr following code in .fla file :

import diagrammingtool.utils.DashedLine;
import flash.geom.Point;
var spt:Point = new Point(200,50);
var ept:Point = new Point(400,100);
var dl:DashedLine = new DashedLine(spt,ept,4,2);

There are no errors but the theres no dashed line appearing either. Can any one point me to the mistake I am making ? Thanks.
package diagrammingtool.utils{

       import flash.geom.Point;

	   import flash.display.Graphics;

	   import flash.display.Sprite;

	   import flash.display.Shape;

        // START CLASS

        public class DashedLine extends Sprite{            

                // CONSTRUCTOR              

               private var startPoint:Point = new Point();

			   private var endPoint:Point = new Point();

               public function DashedLine(sPoint:Point, ePoint:Point, len:Number, gap:Number) {

				   var child:Shape = new Shape();

				   var seglen:Number = len + gap ;

				   var deltax = sPoint.x-ePoint.x; 

				   var deltay = sPoint.y-ePoint.y; 

				   var dist:Number = Math.sqrt(deltax*deltax+deltay*deltay);

				   var noOfSegs:Number =  Math.floor(Math.abs(dist/seglen));

				   var angle:Number = Math.atan2(deltay,deltax);

				   var cx:Number = sPoint.x;

				   var cy:Number = sPoint.y;

				   // add these to cx, cy to get next seg start

				   deltax = Math.cos(angle)*seglen;

				   deltay = Math.sin(angle)*seglen;

				   // loop through each seg

				   for (var n:Number = 0; n < noOfSegs; n++) {,cy);*len,cy+Math.sin(angle)*len);

						cx += deltax;

						cy += deltay;



				   // handle last segment as it is likely to be partial,cy);

				   var delta:Number = Math.sqrt((ePoint.x-cx)*(ePoint.x-cx)+(ePoint.y-cy)*(ePoint.y-cy));


					   // segment ends in the gap, so draw a full dash*len,cy+Math.sin(angle)*len);

				   } else if(delta>0) {

					   // segment is shorter than dash so only draw what is needed*delta,cy+Math.sin(angle)*delta);


				   // move the pen to the end position,ePoint.y);




        // END CLASS



Open in new window

Question by:whatisittellme
  • 3
  • 2
LVL 18

Accepted Solution

Antonio Estrada earned 500 total points
ID: 24860308
Here's an old AS2 class I ported to AS3 also a while back. It works fine, so you might as well check it out:


Author Comment

ID: 24860625
Thank you. I tried using the one you sent with the following code on the .fla file. I might be doing something wrong, the dashed line doesnt show up :(

var dl = new DashedLine(000000,4,90,200,300,400,500,10,5);


Open in new window


Author Comment

ID: 24860726
oops, my works. the had given the coordinates that were way off the stage. figured out. thanks !
LVL 18

Expert Comment

by:Antonio Estrada
ID: 24861465
Glad to help!


Author Comment

ID: 24879230
Hi 'Vulturous'. Could you take a look at this question:

I have a similar problem but in this case I want to implement so that it can be overlayed on google map/microsoft live maps using UMap(it is an Advanced Flash Component available for free download). I would greatly appreciate any help. Thanks !

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

This is intended to introduce all collision detection principles in flash, their strengths, weaknesses and workarounds. The main method for Collision Detection in flash is using hitTestObject. But unless you'll be pushing rectangular shapes without …
The last time I worked with Flash and Socket connections was in AS1. A recent project required flash connecting to a Socket, and sending receiving information - we figured it would be easy enough - we all know about the socket policy documents and c…
The goal of the tutorial is to teach the user how to select which audio input to use. Once you have an audio input plugged into the laptop or computer, you will go into the audio input settings and choose which audio input you want to use.
The goal of the tutorial is to teach the user what frame rate is, how to control it and what effect it has on the video.

867 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

25 Experts available now in Live!

Get 1:1 Help Now