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Gap for lines intersection


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I'm looking for a LISP that lets me break lines that intersect at a desistance I tell it to. I haven't been able to find one yet? Any help will be useful.

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Yes, that's doable.

Could you upload a dwg (/picture) of the desired result? So we know exactly what you want.


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I don't have a lisp, but I use CAB's break lisp explained here: https://skillamplifier.com/break-selected-objects-autocad/

Then I use the lengthen command with negative distance, I have a shortcut for entering. Works well for a few lines, but because lengthen only accepts single object section, not a fence selection, it is tedious to pick lots of lines. (in Bricscad v15 at least)


(defun c:LD  () (command "LENGTHEN" "DELTA") (princ))


Edited by dan20047
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What Dan posted is nice program but doesn't have an option for gaps so this is what I came up with.

Will remeber last gap distance used.


;; Breakes line with a gap.
(defun C:GapBreak (/ oldsnap lst val line cen cir dia a)
  (setq doc (vla-get-modelspace (vla-get-activedocument (vlax-get-acad-object))))
  (setq lst (list 'cmdecho 'osmode)
        val (mapcar 'getvar lst)
  (mapcar 'setvar lst '(0 32))
  (setq line (car (entsel "\nSelect Line: ")))
  (while (/= (cdr (assoc 0 (entget line))) "LINE")  ;repeat until line is selected
    (setq line (car (entsel "\nSelect Line: ")))  
  (setq cen (getpoint "\nBreaking Point: "))
  (setq dia (vlax-ldata-get "cir" "dia"))  ;checks for ldata and sets the variable
  (if (= dia nil) (setq dia "5"))          ;first time running it will default to value 5
  (if (= "" (setq a (getstring (strcat "\nGap Size [" dia "]: "))))
    (setq a dia)  ;if you hit enter it will set a to dia value else override it to what you input
  (vlax-ldata-put "cir" "dia" a)  ;Saves value to drawing
  (setq cir (vla-addcircle doc cen a))
  (command "_.Trim" cir "" (cons line (list cen)) "")
  (vla-delete cir)
  (mapcar 'setvar lst val)


Edited by mhupp
added vl-load-com
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16 hours ago, Samr1979 said:

Emmanuel Delay, This is kind of what I'm talking about


That is what mine does but one point at a time. id use SLW210's since it handles multiple points at once.

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3 minutes ago, dan20047 said:

Ronjonp - thanks! I totally missed that option in CAB's great tool.

Cheers! 🍻

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