Centerline between two polylines

[GP_]

A graphical approach to approximate a centerline between two polylines.

 

To play

 

 

 

 

p.s. Do not exaggerate with sharp curves.

p.p.s. For AutoCAD 2011 or higher

centerPline.LSP

Edited February 15, 2014 by GP_

[Lee Mac]

Interesting method Gian - thanks for sharing!

 

 

Aside: I never realised vlax-erased-p would accept an ename argument - that's quite convenient

[GP_]

Thank you, Lee.

 

 

... vlax-erased-p would accept an ename argument

 

In effect:

 

(vlax-erased-p obj)

Arguments

obj

A VLA-object.

Edited December 24, 2013 by GP_

[Lee Mac]

It would seem that vlax-erased-p is similar to the vlax-curve-* functions in that it will accept either a VLA-Object or ename argument: (contrary to the documentation for these functions):

_$ (setq ent (car (entsel)))
<Entity name: 7ef16a08>
_$ (setq obj (vlax-ename->vla-object ent))
#<VLA-OBJECT IAcadLine 1662331c>

_$ (vlax-curve-getendparam ent)
10.0
_$ (vlax-curve-getendparam obj)
10.0

_$ (vlax-erased-p ent)
nil
_$ (vlax-erased-p obj)
nil

_$ (entdel ent)
<Entity name: 7ef16a08>

_$ (vlax-erased-p ent)
T
_$ (vlax-erased-p obj)
T

[suryacad]

Thank you for this LISP GP_

[GP_]

You're welcome, suryacad

 

Glad it's of use to someone.

[cadplayer]

Fantastic done, thanks for your work _GP

[GP_]

You're welcome cadplayer, thank you for the comment

[AIberto]

when appload

Command: ap
APPLOAD centerPline.LSP successfully loaded.
Command: ; error: misplaced dot on input

[GP_]

when appload

Command: ap
APPLOAD centerPline.LSP successfully loaded.
Command: ; error: misplaced dot on input

 

 

Sorry, I don't know the solution for your problem.

[hanhphuc]

Thanks for sharing sir, though i cant try it on 2007

 

 

 

when appload

Command: ap
APPLOAD centerPline.LSP successfully loaded.
Command: ; error: misplaced dot on input

 

i recognize this error happen if dot place before a number.

try to separate dot.

example: if you see

(40 [color="red"][b].[/b][/color]123)

at least has space

(40 [color="red"][b].[/b][/color] 123)

Edited October 10, 2014 by hanhphuc
typo: palce -> place

[AIberto]

Thanks for sharing sir, though i cant try it on 2007

 

 

 

 

 

i recognize this error happen if dot place before a number.

try to separate dot.

example: if you see

(40 [color=red][b].[/b][/color]123)

at least has space

(40 [color=red][b].[/b][/color] 123)

 

My dear friend hanhphuc ,

Thank you for your idea, I think I found the reason .

just I test it with "vlide" , Found the wrong point .

Now I open it with notepad++

[GreenDD]

Hey guys, can anyone help me to get this work for closed polygons or is there also a LISP code?

[marko_ribar]

Hey guys, can anyone help me to get this work for closed polygons or is there also a LISP code?

 

Maybe this can help...

http://www.cadtutor.net/forum/showthread.php?88968-Endless-Centre-Lines/page2&p=#11

 

M.R.

[GreenDD]

Thanks for your anwser M.R.!

 

But it should work more in the way that it create the centerline of one polygon and not with another.

So that i get the green centerline out of the with closed polygon in the picture.

 

[mardoq]

unfortunately I cant download the routine... there is an error popping out

any chance of reuploading?

[nasarpki]

On 10/9/2014 at 7:14 PM, GP_ said:

 

 

Sorry, I don't know the solution for your problem.

 

On 12/21/2013 at 9:06 PM, GP_ said:

A graphical approach to approximate a centerline between two polylines.

 

To play

 

 

 

 

p.s. Do not exaggerate with sharp curves.

p.p.s. For AutoCAD 2011 or higher

centerPline.LSP

When aploaded getting message

"no function definition: VLAX-CURVE-GETENDPARAM"

[ronjonp]

2 hours ago, nasarpki said:

 

When aploaded getting message

"no function definition: VLAX-CURVE-GETENDPARAM"

Add (vl-load-com) to the code.

[Muthalagan Chidambaram]

On 12/21/2013 at 9:06 PM, GP_ said:

A graphical approach to approximate a centerline between two polylines.

 

To play

 

 

 

 

p.s. Do not exaggerate with sharp curves.

p.p.s. For AutoCAD 2011 or higher

centerPline.LSPUnavailable

 

Can i get the CenterPline.LSP file to my mail please. It is not downloadable

 

[Dadgad]

It appears that 615 people have been able to download it, from GP_s original post, which he edited in 2014. 13 of them since yesterday.

Edited June 3, 2020 by Dadgad
update