Putting break lines in dinemsion extension lines while keeping the dimension associative and intact is easily handled with the following: (sorry about the length) On my computer, I changed C
BREAK to C
B for ease of use.
(prompt "\nDBREAK - dimension line break utility. (C)1997 W.Kramer"
(prompt "\n Downloaded from
;;
;;NOTE:
;; This program originally appeared in CADENCE magazine however,
;; the version displayed in the magazine and available for download
;; has a problem. This version corrects the problem that was
;; discovered.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Programmer's Toolbox - February 1997
;; W.Kramer
;;
;; Dimension line break utility
;; Break whitness and dimension lines in R13
;; dimension objects with out exploding the
;; object. Demonstrates how dimension objects
;; are stored and manipulated as well as
;; dynamic scoping of variables.
;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Listing 1: Main Entry Point
;; Function (C
BREAK)
;;
(defun C
BREAK ( /
;;Local Bound Variables
EN ;;operator selection
P1 ;;break point 1
P2 ;;break point 2
ENL ENB ELB NMB ELT ENT ;;see listing 3
)
;;Operator select input object
;;and break point. -see listing 2
(if (DBREAK0) (progn
(DBREAK1) ;;See listing 3
(if (null
(entmake (list
'(0 . "BLOCK"
(assoc 2 ELT)
(assoc 10 ELT)
'(70 . 1)
))) (progn
(prompt "\nRedefine failed!"
(exit) ;;force exit of routine
)) ;;end IF PROGN
;;Loop through block def seeking
;;LINE object to change.
(while ENT
;;Get the entity list data
(setq ELT (entget ENT))
;;Does entity match the one
;;we want to change?
(if (not (eq ENL ENT))
;;NOT a match,
;;reconstruct block def.
(entmake ELT)
;;else, Found a match,
;; do break & reconstruction.
(DBREAK2) ;;see listing 4
) ;;end IF
;;get next entity in block def.
(setq ENT (entnext ENT))
) ;;end WHILE
(if (entmake '((0 . "ENDBLK"
))
(prompt "\nBlock modified"
(prompt "\nBLOCK END failure!"
) ;;end IF
(entupd ENB)
) ;;end PROGN
(prompt "\nInvalid input"
) ;;end IF dbreak0
(princ)
)
;;-----------------------------------------------
;; Listing 2 - Function DBREAK0
;;
;; Function: DBREAK0 - user input section
;;
(defun DBREAK0 ( /
EL ;;entity list of selected object
)
;;Global Variables
;; EN entity name of selected object
;; P1,P2 points selected
(setq EN
(nentsel
"\nSelect dimension line to break: "
)
;;
(if EN (progn
;;get the object details
(setq EL (entget (car EN))
P1 (cadr EN))
;;first check to see if object selected
;;was a LINE which was part of an insert.
(if (and (= (cdr (assoc 0 EL)) "LINE"
(> (length EN) 2))
;;now ask operator to supply the
;;other side of the break.
(setq P2
(getpoint
(cadr EN)
"\nOther side of break: "
)
(prompt "\nLine was not selected!"
) ;;end IF
))
;;Snap selected points to the nearest object
(if (and P1 P2)
(setq P1 (osnap (cadr EN) "NEA"
P2 (osnap P2 "NEA"
))
;;return True if both input points are okay
(if (and P1 P2) 'T nil))
;;-----------------------------------------------
;; Listing 3 - Function DBREAK1
;;
;; FUNCTION: DBREAK1 - Set up global variables.
;;
(defun DBREAK1 ()
;;Global Variables
;;ENL entity list of line selected
;;ENB entity name of block/dimension
;;ELB entity list of block/dimension
;;NMB name of the block/dimension in table
;;ELT entity list of table entry
;;ENT entity name of block object
(setq
ENL (car EN)
ENB (car (last EN))
ELB (entget ENB)
NMB (cdr (assoc 2 ELB))
ELT (tblsearch "BLOCK" NMB)
ENT (cdr (assoc -2 ELT))
)
)
;;-----------------------------------------------
;; Listing 4 - Function DBREAK2
;;
;; Function DBREAK2: convert line object into
;; two line objects at break points.
;;
(defun DBREAK2 ( /
;;Local Variables
LYR ;;layer name of dim/blk line
PP1 ;;start point of dim/blk line
PP2 ;;end point of dim/blk line
PA ;;break point 1
PB ;;break point 2
)
;;Global Variables
;; P1,P2 - operator break points
;; ELT - entity list of dim/blk line
;;get the line details
(setq PP1 (cdr (assoc 10 ELT))
PP2 (cdr (assoc 11 ELT))
LYR (cdr (assoc 8 ELT)) )
;; Determine end points of
;;new line segments.
(if (< (distance PP1 P1)
(distance PP1 P2))
(setq PA P1
PB P2)
(setq PA P2
PB P1) )
;;Build new lines to replace
;;the broken line.
(LINE PP1 PA Lyr 1)
(LINE PB PP2 Lyr 1))
;;-----------------------------------------------
;; Listing 5 - Function LINE
;;
;; Function: LINE - create line object
(defun LINE (P1 P2 Lyr BlkFlg)
(entmake (list
'(0 . "LINE"
(cons 6 (if BlkFlg "BYBLOCK" "BYLAYER"
)
(if LYR
(cons 8 LYR)
(getvar "CLAYER"
)
(cons 10 P1) (cons 11 P2)
(cons 62 (if BlkFlg 0 256)))))
;;----------------------------------------------- END OF FILE
