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(ssget "_X" (list (cons 0 "~3DSOLID")))

With (initget) and (getkword) for choice precision... (vl-load-com) (defun c:change_prec ( / ss AcDoc Space prec_source ktarget n ename Obj value_string nbs tmp_nbs) (princ "\nSelect MText.") (while (null (setq ss (ssget (list '(0 . "*TEXT") (cons 67 (if (eq (getvar "CVPORT") 1) 1 0)) (cons 410 (if (eq (getvar "CVPORT") 1) (getvar "CTAB") "Model")) ) ) ) ) (princ "\nAren't MText or Text!") ) (setq AcDoc (vla-get-ActiveDocument (vlax-get-acad-object)) Space (if (= 1 (getvar "CVPORT")) (vla-get-PaperSpace AcDoc) (vla-get-ModelSpace AcDoc) ) ) (vla-startundomark AcDoc) (initget 1 "0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Current") (setq ktarget (getkword "\nPrecision of target number [0/1/2/3/4/5/6/7/8/9/10/11/12/13/14/15/16/Current]?: ")) (repeat (setq n (sslength ss)) (setq ename (ssname ss (setq n (1- n))) Obj (vlax-ename->vla-object ename) ) (setq value_string (vla-FieldCode Obj) nbs 0) (cond ((vl-string-search "%<\\" value_string nbs) (while nbs (if (setq nbs (vl-string-search "%pr" value_string (setq tmp_nbs nbs))) (setq prec_source (itoa (atoi (substr value_string (+ nbs 4) 2))) value_string (vl-string-subst (if (eq ktarget "Current") (strcat "%pr" (itoa (getvar "LUPREC"))) (strcat "%pr" ktarget) ) (strcat "%pr" prec_source) value_string tmp_nbs ) nbs (1+ nbs) ) ) ) (vlax-put Obj 'TextString value_string) ) ) ) (vla-endundomark AcDoc) (prin1) )

I'll have to debug it when i get home just typed it up in note pad. -Edit Well if i took two seconds to look at the code. was using integers and needs to be strings. because Tusky is calling vl-string-subst. if its still bugged ill fix it tonight.

Nice test @PGia, thanks! For some reason I didnt consider closed polylines in the _checkOffset function, so I added an extra check there. Should work as expected now: Not sure about the short corner. The lines are so narrow the centerline is pushed back out of the point. Seems to be logical to me but it does feel intuitive. Narrow indents don't get much love from the centerline. So "inlets" don't have enough influence on the shape of the line. What would the expected result be? Below makes sense since there is not enough space to go into the indent. Or are you maybe something like this where the line splits and goes into the hole:

You're welcome @Clint . Yes, the DCL file are not necessary every time, but it can be helpful and user-friendly to accomplish desired result (like this one from an example video from above) if you have multiple choosing (for eg. buttons or check-boxes for Uppercase, Lowercase, Renaming, etc.). Best regards.

You can try this. (vl-load-com) (defun c:change_prec ( / ss AcDoc Space n ename Obj value_string nbs tmp_nbs) (princ "\nSelect MText.") (while (null (setq ss (ssget (list '(0 . "*TEXT") (cons 67 (if (eq (getvar "CVPORT") 1) 1 0)) (cons 410 (if (eq (getvar "CVPORT") 1) (getvar "CTAB") "Model")) ) ) ) ) (princ "\nAren't MText or Text!") ) (setq AcDoc (vla-get-ActiveDocument (vlax-get-acad-object)) Space (if (= 1 (getvar "CVPORT")) (vla-get-PaperSpace AcDoc) (vla-get-ModelSpace AcDoc) ) ) (vla-startundomark AcDoc) (repeat (setq n (sslength ss)) (setq ename (ssname ss (setq n (1- n))) Obj (vlax-ename->vla-object ename) ) (setq value_string (vla-FieldCode Obj) nbs 0) (cond ((eq (substr (vla-FieldCode Obj) 1 3) "%<\\") (while nbs (if (setq nbs (vl-string-search "%pr2" value_string (setq tmp_nbs nbs))) (setq value_string (vl-string-subst "%pr1" "%pr2" value_string tmp_nbs) nbs (1+ nbs) ) ) ) (vlax-put Obj 'TextString value_string) ) ) ) (vla-endundomark AcDoc) (prin1) )

You could try the search function... maybe this thread from lasty week might help?

Added a little on the front end to wrap it all in one command with user input options. Should display something like this Change_Prec or CP Enter "C" for Custom Values Choose Percision From:To : [1:2 1:3 2:1 2:3 3:1 3:2]: 3:2 Changing Select MText Precision From [3] to [2] ... Change_Prec or CP Enter "C" for Custom Values Choose Percision From:To : [1:2 1:3 2:1 2:3 3:1 3:2]: C Existing Precision: 1 Precision Change to: 4 Changing Select MText Precision From [1] to [4] ... Change_Prec 2 1 Changing Select MText Precision From [2] to [1] ... -Edit Updated it so you can just type "Change_Prec 3 2" and skip all that and just start asking you to make a selection.

I have made several versions of the change_prec.lsp code. Maybe it will be useful to someone. Changing the precision of several fields =========================================================== change_prec_1-2.lsp === changing the precision of the fields from 1 to 2 change_prec_1-3.lsp === changing the precision of the fields from 1 to 3 change_prec_2-1.lsp === changing the precision of the fields from 2 to 1 change_prec_2-3.lsp === changing the precision of the fields from 2 to 3 change_prec_3-1.lsp === changing the precision of the fields from 3 to 1 change_prec_3-2.lsp === changing the precision of the fields from 3 to 2 =========================================================== change_prec_fields.lsp

Here is the button macro for selected objects, so something like BIGAL's recommendation should work. ^C^C_SELECT;_MOVE;0,0,0;0,0,1e99;_MOVE;P;;0,0,0;0,0,-1e99;

@Tsuky thank you very much, your code changes the precision of the fields from 2 to 1. I replaced 2 lines in the code to change the precision from 1 to 2. (if (setq nbs (vl-string-search "%pr2" value_string (setq tmp_nbs nbs))) (setq value_string (vl-string-subst "%pr1" "%pr2" value_string tmp_nbs) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * (if (setq nbs (vl-string-search "%pr1" value_string (setq tmp_nbs nbs))) (setq value_string (vl-string-subst "%pr2" "%pr1" value_string tmp_nbs) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * You've been very helpful!

Maybe this kind of solution can be interesting (to use a multiple selection, use Shift+Left mouse click, to use a single selection, use CTRL+Left mouse click): ; ************************************************************************** ; Functions : CHRENLAYERS ; Description : Select Layers To Change It To UPPERCASE Or LOWERCASE ; Author : SAXLLE ; Date : December 04, 2025 ; ************************************************************************** (prompt "\nSelect Layers To Change It To UPPERCASE Or LOWERCASE!\nTo run a LISP type: CHRENLAYERS") (princ) (defun c:CHRENLAYERS ( / old_echo dcl_id fname fn laylist lay items rval acad name) (vl-load-com) (setq old_echo (getvar 'cmdecho)) (setvar 'cmdecho 0) (create_dialog) (collect_layers) (setq dcl_id (load_dialog fname)) (if (not (new_dialog "Laylist" dcl_id)) (exit) ) (action_tile "cancel" "(cancel)") (start_list "ls") (mapcar 'add_list laylist) (end_list) (action_tile "ps1" "(read_items) (to_uppercase)") (action_tile "ps2" "(read_items) (to_lowercase)") (start_dialog) (unload_dialog dcl_id) (vl-file-delete fname) (gc) (princ) ) (defun cancel () (done_dialog 0) (terpri) (prompt "Application running were finished...") (princ) ) (defun collect_layers () (setq laylist (list) lay (tblnext "LAYER" T) ) (while lay (if (not (equal (cdr (assoc 2 lay)) "0")) (setq laylist (cons (cdr (assoc 2 lay)) laylist) lay (tblnext "LAYER") ) (setq lay (tblnext "LAYER")) ) ) (setq laylist (vl-sort laylist '<)) ) (defun read_items () (setq acad (vla-get-activedocument (vlax-get-acad-object))) (setq items (get_tile "ls") rval (mapcar '(lambda (x) (nth x laylist)) (read (strcat "(" items ")"))) ) ) (defun to_uppercase () (foreach item rval (setq name (strcase item)) (vla-SendCommand acad (strcat "-RENAME LA " item (chr 13) name (chr 13))) (prompt (strcat "\nThe layer " item " were changed into the UPPERCASE!")) (setvar 'cmdecho old_echo) (princ) ) (done_dialog 1) ) (defun to_lowercase () (foreach item rval (setq name (strcase item T)) (vla-SendCommand acad (strcat "-RENAME LA " item (chr 13) name (chr 13))) (prompt (strcat "\nThe layer " item " were changed into the LOWERCASE!")) (setvar 'cmdecho old_echo) (princ) ) (done_dialog 1) ) (defun create_dialog () (setq fname (vl-filename-mktemp "Laylist.dcl") fn (open fname "w") ) (write-line "Laylist :dialog { label = \"Select layers to change it to UPPERCASE or LOWERCASE!\"; :list_box { key = \"ls\"; multiple_select = true; height = 10; width = 50; } :row { :button { label = \"Change to UPPERCASE >>\"; key = \"ps1\"; fixed_width = true; } :button { label = \"Change to LOWERCASE >>\"; key = \"ps2\"; fixed_width = true; } :button { label = \"Cancel\"; key = \"cancel\"; mnemonic = \"C\"; alignment = centered; fixed_width = true; is_cancel=true; } } }" fn) (close fn) ) Also, you can see the short video example of how it works. CHRENLAYERS.mp4 Best regards.

@dexus Your animations are really original although I don’t think I managed to see exactly the same thing you showed in your video. But that doesn’t matter. Today I had the whole afternoon free, and I decided to try to “stress-test” your code. I drew several irregular margins and also tried to draw something resembling a “inlet” like the ones GLAVCVS mentions. However, the result was very consistent. In no case was it possible to make the centerline “lose orientation.” It only failed in the case of closed margins, as shown in the attached image. But I assume this happens because you didn’t consider that possibility, given the context of the rest of my examples. Also, there are a few minor details in some wide curves where the centerline clearly drifts away from the middle. Overall, the result is EXCELLENT. Regarding the “inlets” that @GLAVCVS mentions, I suppose it would be great to have a tool capable of robustly handling those cases. But, normally, these situations only occur in a few places and can be handled manually. In any case, a tool like that would definitely put its author’s name on the map. PS: I've attached the drawing of the image. AxisExple3.dwg

It could be as simple as changing "all" to "ss", where ss is a selection set. I am no expert on setting the exclude objects in a selection set. try this not really tested. (setq ss (ssget "_X" '((-4 . "<NOT") (0 . "3DSOLID") (-4 . "NOT>")))) or _move;(setq ss (ssget "_X" '((-4 . "<NOT") (0 . "3DSOLID") (-4 . "NOT>"))));;0,0,0;0,0,1e99;_move;ss;;0,0,0;0,0,-1e99

"pr2" is precision - here 2 places, "pr1" at the end of the first expression is 1 decimal place

Nice test case @PGia, it did have some undesirable zigzags on those lines. I made some changes to the code to prevent this from happening. It should create a smooth line again!

@PGia Thanks for the encouragement and checking the results. I measure from the vertices instead of the lines. Those are calculated and the lines are just to connect the points. So perpendicular to the middle of segments of the centerline will always be a bit off, but if you measure from the vertices it should be centered correctly. Just like @GP_ said. I kept going in the same direction and I have made some improvements and got rid of some bugginess: The centerline should be a little more accurate now because of extra measurements (blue line) Crossing polylines get sharp corners on negative side Corner checks are done on all intersections of temporary line now (red line) More error checking so it doesn't crash on some of the example lines I left all of the 'animation' code commented out so you can give it a try ;| ; Calculate centerline between two polylines - dexus ; Function checks intersections of the offsets of two lines to create a middle/avarage line. ; https://www.cadtutor.net/forum/topic/98778-hybrid-parallel/page/6/#findComment-677339 ; Version 0.1 - Initial release 19-11-2025 ; Version 0.2 - Added corner support on negative side of crossing polylines 27-11-2025 ; Version 0.3 - Extra check using vertex to closest point as distance 28-11-2025 ; Version 0.4 - Added error function 28-11-2025 ; Version 0.5 - Improved distance check to prevent zigzag lines 01-12-2025 ; Version 0.6 - Check if offset can be used before adding points 01-12-2025 ; Version 0.7 - Improved side check on 3 points 01-12-2025 ; Version 0.8 - Don't compare startpoint to offset when eiter of the polylines is closed 04-12-2025 ; Version 0.9 - Add points for parallel end segments and set offsetgaptype 05-12-2025 |; (defun c:cpl (/ corners ent1 ent2 enx2 flipped gap loop maxlen offset offsetdistance parallel pts sides ss start te0 te1 te2 LM:ProjectPointToLine LM:intersections _addPoints _avarageAngle _checkOffset _cornerOffset _doOffset _getAnglesAtParam _getLength _polyline _rlw _side _wait *error*) (defun *error* (st) (if (wcmatch (strcase st t) "*break,*cancel*,*exit*") (redraw) (progn (vl-bt) (princ (strcat "\nOops! Something went wrong: ") st) ) ) (if (and te0 (not (vlax-erased-p te0))) (entdel te0)) (if (and te1 (not (vl-catch-all-error-p te1))) (mapcar 'vla-delete te1)) (if (and te2 (not (vl-catch-all-error-p te2))) (mapcar 'vla-delete te2)) (princ) ) ;| ; Draw Polyline - dexus ; Draw a polyline from a list of points, but filter out colinear points ; @Param lst list of points ; @Returns ename of polyline |; (defun _polyline (lst closed / prev pts) (while lst (cond ( (and (cdr lst) prev (or (equal (cdr lst) prev 1e-8) ; Remove duplicate points (null (inters prev (car lst) prev (cadr lst))) ; Remove collineair points ) ) ) ((setq pts (cons (cons 10 (setq prev (car lst))) pts))) ) (setq lst (cdr lst)) ) (entmakex (append (list (cons 0 "LWPOLYLINE") (cons 100 "AcDbEntity") (cons 100 "AcDbPolyline") (cons 90 (length pts)) (cons 8 (getvar 'clayer)) (cons 70 (if closed 1 0)) ) (reverse pts) ) ) ) (defun _side (pline pnt / cpt end target der) ; https://www.theswamp.org/index.php?topic=55685.msg610429#msg610429 (setq cpt (vlax-curve-getClosestPointTo pline pnt) end (vlax-curve-getEndParam pline) target (vlax-curve-getParamAtPoint pline cpt) der (if (and (equal target (fix target) 1e-8) (or (vlax-curve-isClosed pline) (and (not (equal (vlax-curve-getStartParam pline) target 1e-8)) (not (equal end target 1e-8))) ) ) (mapcar '- (polar cpt (angle '(0 0) (vlax-curve-getFirstDeriv pline (rem (+ target 1e-3) end))) 1.0) (polar cpt (angle (vlax-curve-getFirstDeriv pline (rem (+ (- target 1e-3) end) end)) '(0 0)) 1.0) ) (vlax-curve-getFirstDeriv pline target) ) ) (minusp (sin (- (angle cpt pnt) (angle '(0.0 0.0) der)))) ) ;; Intersections - Lee Mac ;; mod - [int] acextendoption enum of intersectwith method (defun LM:intersections ( ob1 ob2 mod / lst rtn ) (if (and (vlax-method-applicable-p ob1 'intersectwith) (vlax-method-applicable-p ob2 'intersectwith) (setq lst (vlax-invoke ob1 'intersectwith ob2 mod)) ) (repeat (/ (length lst) 3) (setq rtn (cons (list (car lst) (cadr lst) (caddr lst)) rtn) lst (cdddr lst)) ) ) (reverse rtn) ) (defun _getLength (ent) (- (vlax-curve-getDistAtParam ent (vlax-curve-getEndParam ent)) (vlax-curve-getDistAtParam ent (vlax-curve-getStartParam ent)) ) ) (defun _wait (msec) (not ( (lambda (start) (while (< (- (getvar 'millisecs) start) msec)) ) (getvar 'millisecs) ) ) ) (defun _addPoints (lst ent1 ent2 pts / len1 len2) (setq len1 (_getLength ent1) len2 (_getLength ent2) lst (vl-remove nil (mapcar (function (lambda (pt / d1 d2) (if (and (setq d1 (vlax-curve-getDistAtPoint ent1 pt)) (setq d2 (vlax-curve-getDistAtPoint ent2 pt)) ) (list (cond ((and (vlax-curve-isclosed ent1) (not (vlax-curve-isclosed ent2))) (/ d2 len2)) ((vlax-curve-isclosed ent2) (/ d1 len1)) ((+ (/ d1 len1) (/ d2 len2))) ) pt ) ) )) lst ) ) pts (append lst pts)) ; Animation ; (setq pts (vl-sort pts (function (lambda (a b) (< (car a) (car b)))))) ; (redraw) ; (foreach pt lst ; (tmpPoint (cadr pt) 1 1) ; ) ; ( ; (lambda (lst) ; (while (cadr lst) ; (grdraw (cadar lst) (cadar (setq lst (cdr lst))) 3) ; ) ; ) ; pts ; ) ; (vla-update ent1) ; (_wait 40) ; End animation pts ) (defun _checkOffset (ent1 ent2 offset) (or (vlax-curve-isclosed ent1) (vlax-curve-isclosed ent2) (and (equal (distance (vlax-curve-getStartPoint ent1) (vlax-curve-getStartPoint ent2)) offset 1e-4) (equal (distance (vlax-curve-getEndPoint ent1) (vlax-curve-getEndPoint ent2)) offset 1e-4) ) ) ) (defun _doOffset (offset / lst rtn) ; Global vars: pts ent1 ent2 sides te1 te2 (setq te1 nil) (setq te2 nil) (setq rtn (cond ((equal offset 0.0 1e-8) (if (setq lst (LM:intersections ent1 ent2 acExtendNone)) (setq pts (_addPoints lst ent1 ent2 pts)) ) lst ) ( (or ; Make offset (vl-catch-all-error-p (setq te1 (vl-catch-all-apply 'vlax-invoke (list ent1 'Offset (if (car sides) offset (- offset)))))) (cdr te1) (vl-catch-all-error-p (setq te2 (vl-catch-all-apply 'vlax-invoke (list ent2 'Offset (if (cadr sides) offset (- offset)))))) (cdr te2) (not (_checkOffset ent1 (car te1) offset)) (not (_checkOffset ent2 (car te2) offset)) (vla-put-visible (car te1) :vlax-false) (vla-put-visible (car te2) :vlax-false) ) (princ "\nOffset failed. ") nil ) ((setq lst (LM:intersections (car te1) (car te2) acExtendNone)) (if parallel ; Add points of parallel end segments (mapcar (function (lambda (ent1 ent2) (mapcar (function (lambda (pt) (if (equal pt (vlax-curve-getClosestPointTo ent2 pt) 1e-10) (setq lst (cons pt lst)) ) )) (list (vlax-curve-getStartPoint ent1) (vlax-curve-getEndPoint ent1) ) ) )) (list (car te1) (car te2)) (list (car te2) (car te1)) ) ) (setq pts (_addPoints lst (car te1) (car te2) pts)) lst ) ) ) (if (and te1 (not (vl-catch-all-error-p te1))) (mapcar 'vla-delete te1)) (if (and te2 (not (vl-catch-all-error-p te2))) (mapcar 'vla-delete te2)) rtn ) ;| ; Project Point onto Line - Lee Mac ; @Param pt point to project ; @Param p1 first point of line ; @Param p2 second point of line ; @Returns projected point |; (defun LM:ProjectPointToLine ( pt p1 p2 / nm ) (setq nm (mapcar '- p2 p1) p1 (trans p1 0 nm) pt (trans pt 0 nm)) (trans (list (car p1) (cadr p1) (caddr pt)) nm 0) ) (defun _getAnglesAtParam (ent pa / ang1 ang2) (if (and (vlax-curve-isClosed ent) (= pa 0)) ; Special case for closed Polyline (setq ang1 (vlax-curve-getFirstDeriv ent 1e-14) ang2 (vlax-curve-getFirstDeriv ent (- (fix (vlax-curve-getEndParam ent)) 1e-14))) (setq ang1 (vlax-curve-getFirstDeriv ent (+ pa 1e-14)) ang2 (vlax-curve-getFirstDeriv ent (- pa 1e-14))) ) (if (and ang1 ang2) (list (angle '(0 0 0) ang1) (angle '(0 0 0) ang2) ) ) ) ;| ; Avarage Angle - dexus ; Get angle of a line between two angles ; @Param ang1 real - Angle in radians ; @Param ang2 real - Angle in radians ; @Returns real - Angle in radians |; (defun _avarageAngle (ang1 ang2) (if (< (rem (+ ang1 pi) (+ pi pi)) (rem (+ ang2 pi) (+ pi pi)) ) (+ (* (- ang2 ang1) 0.5) ang1) (+ (* (- ang1 ang2) 0.5) ang2) ) ) ;| ; Calculate exact offset distance on a corner - dexus ; pt1 - Point on corner ; pt2 - Point on other side ; pt3 - Center for bisector ; pt4 - Target for corner of the offset ; pt5 - Find perpendicular point for offset distance ; / ; / ; -------- pt1 pt5 ; \ / ; pt4 ; \ ; ---- pt3 ----- pt2 ----- ; ; @Param ent1 Line to check corners ; @Param ent2 Opposing line ; @Returns List of offset distances (pt1 -> pt5) to calculate |; (defun _cornerOffset (ent1 ent2 / ang1 ang1a ang2 ang3 index pt1 pt2 pt3 pt4 pt5 rtn) (setq index 0) (repeat (fix (vlax-curve-getEndParam ent1)) (and (setq pt1 (vlax-curve-getPointAtParam ent1 index)) ; Point on corner (setq ang1 (_getAnglesAtParam ent1 index)) ; Angles of pt1 (setq ang1a (_avarageAngle (car ang1) (cadr ang1))) (setq te0 (entmakex (list (cons 0 "line") (cons 10 pt1) (cons 11 (polar pt1 (- ang1a halfPi) 1))))) ; Temp line for finding the angle on the other side (foreach pt2 (LM:intersections (vlax-ename->vla-object te0) ent2 acExtendThisEntity) ; Point on other side (and (setq ang2 (_getAnglesAtParam ent2 (vlax-curve-getParamAtPoint ent2 pt2))) ; Angle of pt2 (if (equal (rem (car ang1) pi) (rem (car ang2) pi) 1e-8) ; Is parallel? (and (setq parallel (or parallel (< index 1) (<= (fix (vlax-curve-getEndParam ent1)) (1+ index)) t)) (setq pt3 (mapcar (function (lambda (a b) (* (+ a b) 0.5))) pt1 pt2)) ; Midpoint (setq ang3 (car ang1)) ; Same angle als ang1 ) (and (setq pt3 (inters pt1 (polar pt1 (car ang1) 1) pt2 (polar pt2 (car ang2) 1) nil)) ; Find center for bisector (setq ang3 (_avarageAngle (angle pt1 pt3) (angle pt2 pt3))) ; Angle of bisector ) ) (setq pt4 (inters pt3 (polar pt3 ang3 1) pt1 (polar pt1 (+ ang1a halfPi) 1) nil)) ; Find target for corner of the offset (setq pt5 (LM:ProjectPointToLine pt4 pt1 (polar pt1 (+ (car ang1) halfPi) maxlen))) ; Find perpendicular point for offset distance (setq rtn (cons (distance pt1 pt5) rtn)) ; Return offset distance ; Animation ; (progn ; (redraw) ; (grdraw pt1 pt2 1) ; (grdraw pt4 pt5 2) ; (grdraw pt1 pt5 2) ; (grdraw pt2 pt5 2) ; (vla-update ent1) ; (_wait 120) ; ) ; End Animation ) ) ) (if (and te0 (not (vlax-erased-p te0))) (entdel te0)) (setq index (1+ index)) ) rtn ) (defun _rlw (lw / x1 x2 x3 x4 x5 x6) (if (and lw (= (cdr (assoc 0 lw)) "LWPOLYLINE")) (progn (foreach a1 lw (cond ((= (car a1) 10) (setq x2 (cons a1 x2))) ((= (car a1) 40) (setq x4 (cons (cons 41 (cdr a1)) x4))) ((= (car a1) 41) (setq x3 (cons (cons 40 (cdr a1)) x3))) ((= (car a1) 42) (setq x5 (cons (cons 42 (- (cdr a1))) x5))) ((= (car a1) 210) (setq x6 (cons a1 x6))) (t (setq x1 (cons a1 x1))) ) ) (append (reverse x1) (append (apply (function append) (apply (function mapcar) (cons 'list (list x2 (cdr (reverse (cons (car x3) (reverse x3)))) (cdr (reverse (cons (car x4) (reverse x4)))) (cdr (reverse (cons (car x5) (reverse x5)))) )) )) x6) ) ) ) ) (if (and (not (while (cond ((not (setq ss (ssget '((0 . "LWPOLYLINE"))))) (princ "\nNothing selected. Try again...\n") ) ((/= (sslength ss) 2) (princ "\nSelect 2 polylines! Try again...\n") ) ((and (setq ent1 (ssname ss 0)) (setq ent2 (ssname ss 1)) (setq enx2 (entget ent2)) (setq ent1 (vlax-ename->vla-object ent1)) (setq ent2 (vlax-ename->vla-object ent2)) ) nil ; Stop loop ) ) ) ) ent1 ent2 ) (progn (and (< (distance (vlax-curve-getStartPoint ent1) (vlax-curve-getEndPoint ent2)) (distance (vlax-curve-getEndPoint ent1) (vlax-curve-getEndPoint ent2)) ) (setq flipped t) (entmod (_rlw enx2)) ) (setq sides (mapcar (function (lambda (a b / s m e) (setq s (_side a (vlax-curve-getStartPoint b)) m (_side a (vlax-curve-getPointAtParam b (* 0.5 (vlax-curve-getEndParam b)))) e (_side a (vlax-curve-getEndPoint b))) (or (and s m) (and s e) (and m e)) )) (list ent1 ent2) (list ent2 ent1) ) ) (if (not (numberp halfPi)) (setq halfPi (* pi 0.5))) (setq maxlen (* 1.1 (max (_getLength ent1) (_getLength ent2) ( (lambda (ent1 ent2 / step de1 div p_step dis dmax) (setq step (/ (setq de1 (vlax-curve-getDistAtParam ent1 (vlax-curve-getEndParam ent1))) 500) div step dmax 0.00) (while (< div de1) (setq p_step (vlax-curve-getPointAtDist ent1 div) dis (distance p_step (vlax-curve-getClosestPointTo ent2 p_step))) (if (> dis dmax) (setq dmax dis)) (setq div (+ div step)) ) dmax ) ent1 ent2 ) ) ) ) (mapcar ; Add half distances from closest point to every vertex (function (lambda (ent1 ent2 / index pt) (setq index 0) (repeat (fix (vlax-curve-getEndParam ent1)) (setq pt (vlax-curve-getPointAtParam ent1 index) corners (cons (* (distance pt (vlax-curve-getClosestPointTo ent2 pt)) 0.5) corners) index (1+ index)) ; Animation ; (redraw) ; (grdraw pt (vlax-curve-getClosestPointTo ent2 pt) 4) ; ( ; (lambda (mid) (grdraw mid (polar mid (+ (angle pt (vlax-curve-getClosestPointTo ent2 pt)) halfPi) (car corners)) 2)) ; (mapcar (function (lambda (a b) (* (+ a b) 0.5))) pt (vlax-curve-getClosestPointTo ent2 pt)) ; ) ; (vla-update ent1) ; (_wait 120) ; End animation ) )) (list ent1 ent2) (list ent2 ent1) ) (setq corners (vl-sort (append corners (_cornerOffset ent1 ent2) (_cornerOffset ent2 ent1)) '<) offsetdistance (/ maxlen 512.0)) (if (LM:intersections ent1 ent2 acExtendNone) ; For crossing polylines, add negative values (setq offset (- maxlen) corners (append (mapcar '- (reverse corners)) corners)) (setq offset 0.0) ) (setq gap (getvar 'offsetgaptype)) (setvar 'offsetgaptype 0) (while (progn (while (and corners (> offset (car corners))) ; Calculated offset values to check (_doOffset (car corners)) (setq corners (cdr corners)) ) (setq loop ; Incremental check (cond ((> offset maxlen) nil) ((_doOffset offset) (setq start t)) ((not start) t) (start nil) ) ) (setq offset (+ offset offsetdistance)) loop ) ) (setvar 'offsetgaptype gap) (if flipped (entmod enx2)) (if pts ; Draw polyline (_polyline (mapcar 'cadr (vl-sort pts (function (lambda (a b) (< (car a) (car b)))))) (and (vlax-curve-isClosed ent1) (vlax-curve-isClosed ent2)) ) ) ) ) (redraw) (princ) ) And here is an animation of it working just because they are fun to look at :

A version also for closed polylines. Minimally tested... centerPline_v2.LSP