topic Re: Constant thickness dashed line - waterproofing in AutoCAD Forum

Constant thickness dashed line - waterproofing

adriaGMU8Z — Fri, 31 May 2019 07:46:56 GMT

How can I get this result?

The aim is to stroke one single polyline and get two thin lines and thicker dashed line at the center.

My closest attempt has been to s construct a multiline with its lines in different layers (different weights), however the weight of the central line is dependant on the scale of the viewport, consequently its width is smaller or larger than the two thin lines in each presentation that it appears in.

Any clues?

Thanks!

Re: Constant thickness dashed line - waterproofing

TheCADnoob — Fri, 31 May 2019 15:05:18 GMT

I would be tempted to create a line type.

Another method to consider would be to use somthing like lee macs multi-polyline lisp http://www.lee-mac.com/mpline.html and then change the middle line width after creating it. (PEDIT and change width)

To create the line use the MKSHAPE command and the MKLTYPE command (Requires express tools - no LT)

Below is a screencast where i created another line type but the method should be about the same.

Screencast will be displayed here after you click Post.

22d47664-ad08-430a-a8da-b3cd55d906a5

Re: Constant thickness dashed line - waterproofing

Kent1Cooper — Tue, 04 Jun 2019 12:14:02 GMT

@TheCADnoob wrote:

I would be tempted to create a line type.

....

22d47664-ad08-430a-a8da-b3cd55d906a5

If you choose that two-shapes approach in a linetype, you can greatly reduce the jiggity effect at curves by using the approach >here< [that's about embedded Text, but the principle is the same for other shapes].

Re: Constant thickness dashed line - waterproofing

munyc — Mon, 11 Oct 2021 23:01:38 GMT

Hi!

stumbled across your post looking for a waterproofing line like that. Did you get it resolved?

Re: Constant thickness dashed line - waterproofing

adriaGMU8Z — Tue, 12 Oct 2021 06:26:27 GMT

Somehow, I am currently drawing it using 3 manually offseted lines the side lines being a regular polyline and the central line being a dashed multiline, i set the thickness of this central line using the properties dashboard. The visual output is very good however it is a bit tedious.

Re: Constant thickness dashed line - waterproofing

Kent1Cooper — Tue, 12 Oct 2021 11:22:50 GMT

@adriaGMU8Z wrote:
... I am currently drawing it using 3 manually offseted lines the side lines being a regular polyline and the central line being a dashed multiline, i set the thickness of this central line using the properties dashboard. The visual output is very good however it is a bit tedious.

The tedium can be reduced, with something like this [untested]:

(defun C:TEST (/ thk pl plobj) (setq thk (getdist "\nDrawn thickness of waterproofing membrane: ")) (setvar 'plinewid 0) (prompt "\nDraw center-line path of membrane section.") (command-s "_.pline") (setq pl (entlast) plobj (vlax-ename->vla-object pl)) (vla-offset plobj (/ thk 2)) (vla-offset plobj (/ thk -2)) (command "_.chprop" pl "" "_ltype" "dashed" "") ;; [does not require the linetype to be already loaded] (entmod (append (entget pl) (list (cons 43 thk)))); middle-one width (princ) )

That is in simplest terms. It could be enhanced, for instance to save your membrane thickness and offer it as default, to save the current PLINEWID System Variable value [in case it's not 0] and restore it afterwards, etc.

If you want to first draw one of the edges rather than the middle, that can be done, though it will require a User pick of the side to which to OFFSET the initial Polyline.

Re: Constant thickness dashed line - waterproofing

Serhii_Leshchenko — Tue, 12 Sep 2023 08:47:02 GMT

Recently I came across this linetype. I don't know how our team got it, but it is very handy (I don't have .lin file, just dwg). I was trying to export it to .lin, but it didn't worked. I think it is not a shape, it bends like a spline

Re: Constant thickness dashed line - waterproofing

s.proch — Tue, 12 Sep 2023 09:03:48 GMT

@Serhii_Leshchenko would you like to share the dwg file? 🙂

Re: Constant thickness dashed line - waterproofing

Serhii_Leshchenko — Tue, 12 Sep 2023 16:20:47 GMT

Here it is

Re: Constant thickness dashed line - waterproofing

adbaco — Wed, 13 Sep 2023 09:34:19 GMT

This line works really good, thank you very much for sharing.

If you enable "linetype generation" it works with polylines at corners.

Re: Constant thickness dashed line - waterproofing

s.proch — Wed, 13 Sep 2023 09:51:55 GMT

Thanks a lot! This is very good!

Re: Constant thickness dashed line - waterproofing

munyc — Wed, 13 Sep 2023 13:25:33 GMT

Hello! The file only contained a continuous line circle when I open it (AC LT 2024 Mac). Can you please help?

Re: Constant thickness dashed line - waterproofing

adriaGMU8Z — Wed, 13 Sep 2023 14:41:01 GMT

You can draw any polyline and use "matchprop" to copy the properties

Re: Constant thickness dashed line - waterproofing

justinMY7R3 — Fri, 15 Sep 2023 14:37:52 GMT

Hello,

Im wondering if this will not work in auto cad LT for Mac? We can download the file, but cannot copy the object or see the line type.

Thank you

Re: Constant thickness dashed line - waterproofing

s.proch — Fri, 15 Sep 2023 14:58:14 GMT

I just tried opening the file in ACAD LT (Windows) and the line type shows fine! You might need to re-assign the line type in Layer Properties Manager.