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I guess you could do like (setq i (+ i 0.01)) 16 vertex poly would then create a 1600 vertex poly And then run overkill on the created polyline to remove all collinear vertexes.

I guess the solution is to programme how you currently do this - what is your manual method? As for a solution, haven't looked how SLW210 does his but might expand MHUPP to use both polylines and find the mid points using all verticies.

You can try this...I am not sure how accurate it will be for you, but 100-500 sample size looked pretty good on your drawing, you can change the default, but I kept it at 50 for myself. ;;; Draw a polyline centered between two selected polylines (can be dissimilar/irregular). ;;; ;;; https://www.cadtutor.net/forum/topic/98778-hybrid-parallel/#findComment-676800 ;;; ;;; By SLW210 (a.k.a. Steve Wilson) ;;; (defun c:DrawCl (/ pl1 pl2 num-pts len1 n dist step pt1 pt2 midpt pts) (vl-load-com) ;; Select first polyline (setq pl1 (car (entsel "\nSelect first polyline: "))) (if (not (and pl1 (= (cdr (assoc 0 (entget pl1))) "LWPOLYLINE"))) (progn (princ "\nInvalid first selection.") (exit)) ) ;; Select second polyline (setq pl2 (car (entsel "\nSelect second polyline: "))) (if (not (and pl2 (= (cdr (assoc 0 (entget pl2))) "LWPOLYLINE"))) (progn (princ "\nInvalid second selection.") (exit)) ) ;; Set number of sample points to use (it uses last number entered, default is 50) (if (not *CL_lastNumPts*) (setq *CL_lastNumPts* 50)) (setq num-pts (getint (strcat "\nEnter number of sample points <" (itoa *CL_lastNumPts*) ">: ") ) ) (if (null num-pts) (setq num-pts *CL_lastNumPts*)) (setq *CL_lastNumPts* num-pts) ;; Calculate (setq len1 (vlax-curve-getDistAtParam pl1 (vlax-curve-getEndParam pl1))) (setq step (/ len1 num-pts)) (setq dist 0.0 pts '() ) ;; Midpoint list (repeat (1+ num-pts) (setq pt1 (vlax-curve-getPointAtDist pl1 dist)) (setq pt2 (vlax-curve-getClosestPointTo pl2 pt1)) (if (and pt1 pt2) (setq pts (cons (mapcar '(lambda (a b) (/ (+ a b) 2.0)) pt1 pt2) pts)) ) (setq dist (+ dist step)) ) ;; Create polyline (if pts (progn (setq pts (reverse pts)) (entmake (append (list (cons 0 "LWPOLYLINE") (cons 100 "AcDbEntity") (cons 100 "AcDbPolyline") (cons 90 (length pts)) (cons 70 0) ) (mapcar '(lambda (p) (cons 10 p)) pts) ) ) (princ "\nCenterline drawn accurately between polylines.") ) (princ "\nNo points generated — check polylines.") ) (princ) ) (princ "\nType DrawCl to draw a centerline between two polylines.") (princ) That said, I just tried Lee Mac's cPoly in mhupp's last link posted, seems to be similar results to mine if you adjust the sample points. I haven't checked the others yet, I'll run through them if I get time. I originally made mine with the command function, then changed it to entmake, pretty sure the accuracy is the same, it just had a lot of "Specify next point or [Arc/Close/Halfwidth/Length/Undo/Width]:" in the commandline for each sample. P.S. Mine should take into account reversed polylines. At the same sample size, mine and Lee Mac's seem to be exactly the same on your drawing. I still have to do on mine, set a layer and linetype option in the code.

in essence I took out the dbx stuf like : (defun dbx_ver ( / v) (strcat "objectdbx.axdbdocument" (if (< (setq v (atoi (getvar 'acadver))) 16) "" (strcat "." (itoa v))))) (setq acApp (vlax-get-acad-object) acDoc (vla-get-ActiveDocument acApp)) (setq dbx (vl-catch-all-apply 'vla-getinterfaceobject (list acApp (dbx_ver)))) (vla-open dbx dwg) ; put all block objects in a list (setq object-list (ss->ol ss)) ; put list with objects in a safe array (setq object-safe-array (vlax-make-safearray vlax-vbobject (cons 0 (1- (length object-list))))) (vl-catch-all-apply 'vlax-safearray-fill (list object-safe-array object-list)) ; copy objects to dbx-drawing (vla-CopyObjects acDoc object-safe-array (vla-get-ModelSpace dbx)) (vl-catch-all-apply 'vla-saveas (list dbx dwg)) (vl-catch-all-apply 'vlax-release-object (list dbx)) (setq object-list nil object-safe-array nil) In lasted version I used : (defun Get_EX_Blocknames (dbDoc / fn l) (if (and (eq (type dbDoc) 'STR)(setq fn (findfile dbDoc)) (setq doc (vla-open (vla-get-documents (vlax-get-acad-object)) fn))) (progn (setq l (GetDocBlockNames doc))(vla-close doc)(vlax-release-object doc))) l) ;;; test (setq lst (GetDocBlockNames (vla-get-ActiveDocument (vlax-get-acad-object)))) (defun GetDocBlockNames ( d / b n l) (vlax-for b (vla-get-blocks d) (if (and (= :vlax-false (vla-get-isxref b)) (= :vlax-false (vla-get-islayout b)) (not (vl-string-search "*" (setq n (vla-get-name b)))))(setq l (cons n l)))) l) instead of using (vla-open dbx dwg) I now used (vla-open (vla-get-documents (vlax-get-acad-object)) fn) using vla-open means you best only use vla- commands and never ever use vla-activate until the very last end because at that point lisp focus will end there and any code left with it. Lisp can only run in one document at the time , but when using vla- commands only it is possible to open and close other drawing and stil maintain lisp focus. Maybe not beginners stuf but me too only got where I am by beg steal & borrow code from others , change things an see what happens. This all costs time but having a wife with her own hobbies or not having a social life all helps

What version of GstarCAD are you using? Enhanced API in GstarCAD 2024 I would think anything that runs in AutoCAD LT would work, if I have time and @rlx doesn't get back, I'll try to look at them (I am curious about this). If you could carefully list out what happened with each code in AutoCAD and GstarCAD, it would help.

You can try if this works better. No dbx in this version Start app , make selection , select drawing you want to paste in later. This drawing is shortly opened (not sure if it works if drawing is already open) List with blocknames is created and drawing is closed. Blocknames are compared and if duplicates are found message is displayed. You can choose 1- Stop , 2 - Rename the blocks in drawing you made the selection set (not the other drawing), or 3 - copy / paste as it is. Only thing left to do is select your basepoint (or replace 'pause' with "0,0" in the code) and selection set is placed on clipboard , ready to paste. ;;; check before paste - rlx 2025-10-22 (defun c:cbp ( / this-dwg ss other-dwg blocknames-in-selectionset blocknames-in-other-dwg duplicate-blocknames dbx-doc) (setq this-dwg (vla-get-ActiveDocument (vlax-get-acad-object))) (if (and (setq ss (ssget)) (setq other-dwg (getfiled "Drawing to check before you paste" "" "dwg" 0))) (progn (if (vl-consp (setq blocknames-in-selectionset (Get_SS_BlockNames ss))) (setq blocknames-in-selectionset (mapcar 'strcase blocknames-in-selectionset))) (if (vl-consp (setq blocknames-in-other-dwg (Get_EX_Blocknames other-dwg))) (setq blocknames-in-other-dwg (mapcar 'strcase blocknames-in-other-dwg))) (setq duplicate-blocknames (compare_block_names blocknames-in-selectionset blocknames-in-other-dwg)) (if (vl-consp duplicate-blocknames) (progn (dplm duplicate-blocknames "Duplicated block names : ") (setq inp (cfl (list "1 - I'm not gonna paste" "2 - Rename blocks before pasting" "3 - I'm gonna paste anyway"))) (cond ((or (void inp) (wcmatch inp "1*")) (alert "Copybase aborted")) ((wcmatch inp "2*")(foreach b duplicate-blocknames (rename_block_definition b)) (princ "\nBlocks are renamed - select your basepoint now") (command "_copybase" pause ss "")) ((wcmatch inp "3*") (princ "\nBlock names unchanged - select your basepoint now")(command "_copybase" pause ss "")) (t (princ"\nBite me...")) ) ) (progn (princ "\nNo duplicate block names found - select your basepoint")(command "_copybase" pause ss "")) ) ) ) (princ) ) ;;; get block names active doc - vanilla (defun _bl ( / b l ) (while (setq b (tblnext "BLOCK" (null b))) (if (zerop (boole 1 21 (cdr (assoc 70 b)))) (setq l (cons (cdr (assoc 2 b)) l)))) l) (defun Get_EX_Blocknames (other-dwg / fn l) (if (and (eq (type other-dwg) 'STR)(setq fn (findfile other-dwg)) (setq doc (vla-open (vla-get-documents (vlax-get-acad-object)) fn))) (progn (setq l (GetDocBlockNames doc))(vla-close doc)(vlax-release-object doc))) l) ;;; test (setq lst (GetDocBlockNames (vla-get-ActiveDocument (vlax-get-acad-object)))) (defun GetDocBlockNames ( d / b n l) (vlax-for b (vla-get-blocks d) (if (and (= :vlax-false (vla-get-isxref b)) (= :vlax-false (vla-get-islayout b)) (not (vl-string-search "*" (setq n (vla-get-name b)))))(setq l (cons n l)))) l) (defun create_unique_blockname ( $bn / i bn) (setq i 0)(while (tblsearch "block" (setq bn (strcat $bn "_" (itoa (setq i (1+ i))))))) bn) (defun rename_block_definition ( $bn / bc bn ) (setq bc (vla-get-blocks (vla-get-ActiveDocument (vlax-get-acad-object)))) (if (and (not (void $bn)) (tblsearch "block" $bn)) (vla-put-name (Collection-Member $bn bc)(setq bn (create_unique_blockname $bn)))) bn) (defun compare_block_names (a b / c) (and (vl-consp a) (vl-consp b) (foreach item a (if (member item b) (setq c (cons item c))))) c) (defun Get_SS_BlockNames ( ss / n l) (foreach o (ss->ol ss)(if (and (setq n (block-n o))(not (member n l)))(setq l (cons n l)))) l) (defun SS->OL (ss / i l)(setq i 0)(repeat (sslength ss)(setq l (cons (vlax-ename->vla-object (ssname ss i)) l) i (1+ i))) l) (defun void (x) (or (eq x nil)(and (listp x)(not (vl-consp x)))(and (eq 'STR (type x))(eq "" (vl-string-trim " \t\r\n" x))))) (defun block-n (o)(if (and (= 'vla-object (type O))(eq (vla-get-objectname O) "AcDbBlockReference")) (if (vlax-property-available-p o 'EffectiveName) (vla-Get-EffectiveName o) (vla-Get-Name o)) nil)) (defun Collection-Member (m c / r) (if (vl-catch-all-error-p (setq r (vl-catch-all-apply 'vla-item (list c m)))) nil r)) ;;; display list (plus message) (defun dplm (l m / f p d w) (and (vl-consp l) (setq l (mapcar 'vl-princ-to-string l)) (setq w (+ 5 (apply 'max (mapcar 'strlen l)))) (setq p (open (setq f (vl-filename-mktemp ".dcl")) "w")) (princ (strcat "cfl:dialog{label=\"" m "\";:list_box {key=\"lb\";" "width="(itoa w)";}ok_only;}") p)(not (setq p (close p)))(< 0 (setq d (load_dialog f)))(new_dialog "cfl" d)(progn (start_list "lb") (mapcar 'add_list l)(end_list)(action_tile "accept" "(done_dialog)")(start_dialog)(unload_dialog d)(vl-file-delete f)))) ;; choose from list (cfl '("1""2""3")) (defun cfl (l / f p d r) (and (setq p (open (setq f (vl-filename-mktemp ".dcl")) "w")) (princ "cfl:dialog{label=\"Choose\";:list_box{key=\"lb\";width=40;}ok_cancel;}" p) (not (setq p (close p)))(< 0 (setq d (load_dialog f)))(new_dialog "cfl" d) (progn (start_list "lb")(mapcar 'add_list l)(end_list)(action_tile "lb" "(setq r (nth (atoi $value) l))(done_dialog 1)") (action_tile "accept" "(setq r (get_tile \"lb\"))(done_dialog 1)")(action_tile "cancel" "(setq r nil)(done_dialog 0)") (start_dialog)(unload_dialog d)(vl-file-delete f))) (cond ((= r "") nil)(r r)(t nil))) edit : just had an idea , why not open the 'to be pasted' drawing after you made your selection. Also tried if it was a bad thing if both drawings were already open and yes , that's bad... but then I'm a bad bad dragon (it still opens but as read only) Because I use vla-activate at the end , all lisp stops (obviously) Once drawings is activated you can copypaste / ctrl-V yourself (I'm sure as hell not comming to do that for you ) You decide what make you happy... ;;; check before paste 2 : after selection open the 'to be pasted' drawing - rlx 2025-10-22 (defun c:cbp2 ( / acDoc *docs* ss dbDoc blocknames-in-selectionset blocknames-in-dbDoc duplicate-blocknames inp do-it) (setq acDoc (vla-get-ActiveDocument (vlax-get-acad-object)) *docs* (vla-get-documents (vlax-get-acad-object))) (if (and (setq ss (ssget)) (setq dbDoc (getfiled "Drawing to check before you paste" "" "dwg" 0))) (progn (if (vl-consp (setq blocknames-in-selectionset (Get_SS_BlockNames ss))) (setq blocknames-in-selectionset (mapcar 'strcase blocknames-in-selectionset))) (if (vl-consp (setq blocknames-in-dbDoc (Get_EX_Blocknames dbDoc))) (setq blocknames-in-dbDoc (mapcar 'strcase blocknames-in-dbDoc))) (setq duplicate-blocknames (compare_block_names blocknames-in-selectionset blocknames-in-dbDoc)) (if (vl-consp duplicate-blocknames) (progn (dplm duplicate-blocknames "Duplicated block names : ") (setq inp (cfl (list "1 - I'm not gonna paste" "2 - Rename blocks before pasting" "3 - I'm gonna paste anyway"))) (cond ((or (void inp) (wcmatch inp "1*")) (alert "Copybase aborted")) ((wcmatch inp "2*")(foreach b duplicate-blocknames (rename_block_definition b)) (princ "\nBlocks are renamed - select your basepoint now") ;|(command "_copybase" pause ss "")|; (setq do-it t)) ((wcmatch inp "3*") (princ "\nBlock names unchanged - select your basepoint now") ;|(command "_copybase" pause ss "")|; (setq do-it t)) (t (princ"\nBite me...")) ) ) (progn (princ "\nNo duplicate block names found - select your basepoint") ;|(command "_copybase" pause ss "")|; (setq do-it t)) ) ) ) (if do-it (do_it)) ) (defun do_it ( / f d) (command "_copybase" pause ss "")(and (eq (type dbDoc) 'STR) (setq f (findfile dbDoc))(setq d (vla-open *docs* f)))(vla-activate d)) ;;; get block names active doc - vanilla (defun _bl ( / b l ) (while (setq b (tblnext "BLOCK" (null b))) (if (zerop (boole 1 21 (cdr (assoc 70 b)))) (setq l (cons (cdr (assoc 2 b)) l)))) l) (defun Get_EX_Blocknames (dbDoc / fn l) (if (and (eq (type dbDoc) 'STR)(setq fn (findfile dbDoc)) (setq doc (vla-open (vla-get-documents (vlax-get-acad-object)) fn))) (progn (setq l (GetDocBlockNames doc))(vla-close doc)(vlax-release-object doc))) l) ;;; test (setq lst (GetDocBlockNames (vla-get-ActiveDocument (vlax-get-acad-object)))) (defun GetDocBlockNames ( d / b n l) (vlax-for b (vla-get-blocks d) (if (and (= :vlax-false (vla-get-isxref b)) (= :vlax-false (vla-get-islayout b)) (not (vl-string-search "*" (setq n (vla-get-name b)))))(setq l (cons n l)))) l) (defun create_unique_blockname ( $bn / i bn) (setq i 0)(while (tblsearch "block" (setq bn (strcat $bn "_" (itoa (setq i (1+ i))))))) bn) (defun rename_block_definition ( $bn / bc bn ) (setq bc (vla-get-blocks (vla-get-ActiveDocument (vlax-get-acad-object)))) (if (and (not (void $bn)) (tblsearch "block" $bn)) (vla-put-name (Collection-Member $bn bc)(setq bn (create_unique_blockname $bn)))) bn) (defun compare_block_names (a b / c) (and (vl-consp a) (vl-consp b) (foreach item a (if (member item b) (setq c (cons item c))))) c) (defun Get_SS_BlockNames ( ss / n l) (foreach o (ss->ol ss)(if (and (setq n (block-n o))(not (member n l)))(setq l (cons n l)))) l) (defun SS->OL (ss / i l)(setq i 0)(repeat (sslength ss)(setq l (cons (vlax-ename->vla-object (ssname ss i)) l) i (1+ i))) l) (defun void (x) (or (eq x nil)(and (listp x)(not (vl-consp x)))(and (eq 'STR (type x))(eq "" (vl-string-trim " \t\r\n" x))))) (defun block-n (o)(if (and (= 'vla-object (type O))(eq (vla-get-objectname O) "AcDbBlockReference")) (if (vlax-property-available-p o 'EffectiveName) (vla-Get-EffectiveName o) (vla-Get-Name o)) nil)) (defun Collection-Member (m c / r) (if (vl-catch-all-error-p (setq r (vl-catch-all-apply 'vla-item (list c m)))) nil r)) ;;; display list (plus message) (defun dplm (l m / f p d w) (and (vl-consp l) (setq l (mapcar 'vl-princ-to-string l)) (setq w (+ 5 (apply 'max (mapcar 'strlen l)))) (setq p (open (setq f (vl-filename-mktemp ".dcl")) "w")) (princ (strcat "cfl:dialog{label=\"" m "\";:list_box {key=\"lb\";" "width="(itoa w)";}ok_only;}") p)(not (setq p (close p)))(< 0 (setq d (load_dialog f)))(new_dialog "cfl" d)(progn (start_list "lb") (mapcar 'add_list l)(end_list)(action_tile "accept" "(done_dialog)")(start_dialog)(unload_dialog d)(vl-file-delete f)))) ;; choose from list (cfl '("1""2""3")) (defun cfl (l / f p d r) (and (setq p (open (setq f (vl-filename-mktemp ".dcl")) "w")) (princ "cfl:dialog{label=\"Choose\";:list_box{key=\"lb\";width=40;}ok_cancel;}" p) (not (setq p (close p)))(< 0 (setq d (load_dialog f)))(new_dialog "cfl" d) (progn (start_list "lb")(mapcar 'add_list l)(end_list)(action_tile "lb" "(setq r (nth (atoi $value) l))(done_dialog 1)") (action_tile "accept" "(setq r (get_tile \"lb\"))(done_dialog 1)")(action_tile "cancel" "(setq r nil)(done_dialog 0)") (start_dialog)(unload_dialog d)(vl-file-delete f))) (cond ((= r "") nil)(r r)(t nil)))

See what this does. https://www.cadtutor.net/forum/topic/14213-lisp-to-create-polyline-between-polylines/#findComment-117973

I use Bricscad and Acad so maybe do the set check twice. Sub PTEXT() On Error Resume Next Dim app As Object, Doc As Object On Error Resume Next Set app = GetObject(, "BricscadApp.AcadApplication") 'Checks if BricsCAD is open probably have to change for AutoCAD. If app Is Nothing Then 'Checks if Autocad is open Set App = GetObject(, "AutoCAD.Application") End If If app Is Nothing Then MsgBox "BriscCAD / Autocad isns't Open!", vbCritical, "Output Error" Else: MsgBox "Cad found" Exit Sub End If End Sub app twice