Help Required

[Steve Rudd]

Hi,
I have put this code to-gether which is intended to rescale existing block entities. However, when attributes are present, they are ignored and remain at the original size. What needs to be changed? Also, is the method I have used to obtain and revise the assoc codes of the inserts the most efficient?

(defun c:resc
(setq a(ssget))
(setq sc(getreal "\nEnter Drawing Scale :"))
(setq n(sslength a))
(setq index 0)
(repeat n
(setq b1 (entget(ssname a index)))
(setq index (+ index 1))
(setq b (assoc 0 b1))
(if (= "INSERT" (cdr b))
(progn
(setq c1 (assoc 41 b1))
(setq c2 (assoc 42 b1))
(setq c3 (assoc 43 b1))
(setq d1 (cons (car c1) sc))
(setq d2 (cons (car c2) sc))
(setq d3 (cons (car c3) sc))
(setq b2 (subst d1 c1 b1))
(setq b2 (subst d2 c2 b2))
(setq b2 (subst d3 c3 b2))
(entmod b2)
);progn
);if
);repeat
);defun

Rgds, Steve

 

[Rune Wold]

Block references (INSERT) with attribute references (ATTRIB) have their DXF code 66 set to 1.

Using the ENTNEXT function on the entity name (DXF -1) of the INSERT gives you the entity name of the first ATTRIB. Then use ENTNEXT with the first ATTRIB's entity name to get the entity name of the second ATTRIB, and so on. Repeat until the returned entity is a SEQEND and you have all ATTRIBs that belong to your INSERT.

Calculating the new size and position of each ATTRIB can be a pain, so if all your INSERTs are proportionally scaled (same scale factor for X, Y and Z), I'll recommend you use the SCALE command.

Here's a quick example (watch for wrap):

(defun C:ReScale (/ rScale ssEnt iCnt eprIns rRelScale) (if (setq ssEnt (ssget)) (setq rScale (getdist "\nEnter Drawing Scale :")) ) (if rScale (repeat (sslength ssEnt) (if (= (cdr (assoc 0 (setq eprIns (entget (ssname ssEnt (setq iCnt (if iCnt (1+ iCnt) 0))))))) "INSERT") (progn (if (= (cdr (assoc 41 eprIns)) (cdr (assoc 42 eprIns)) (cdr (assoc 43 eprIns))) (progn (setq rRelScale (/ rScale (cdr (assoc 41 eprIns)))) (command "._SCALE" (cdr (assoc -1 eprIns)) "" (cdr (assoc 10 eprIns)) rRelScale) ) ) ) ) ) )
)

I see you are not dimensioning local variables. This means that all your variables will be populated after the function has been run. Sooner or later, this will get you into trouble.

And I'm a fan of Hungarian Notation...

 

[urugx]

Can't you not use the scale command.
Just extract the insert point of the block
and use the scale command. Then you
don't have to worry about attributes.

Sounds so simple, but may not be what
you want.

 

[Steve Rudd]

Rune,

Thanx for your reply. The thought of using the scale command had not entered my head, even though I was using this command each time, manually. Your code has opened my eyes somewhat. I will learn from what you have done.
Thank you so much.

Rgds, Steve.