custom arc'd leader lisp..

We use the attached lisp to draw arc'd leaders.. the problem being we
can't "update" them, they have to be redrawn.

Is there a way we can change this lisp such that it is possible to
"update" like any other dim/leader?? or does anyone have a ready-made
command that will sufice that they are willing to share..?

(posted this a few months ago, and got no responce).

(defun c:AA (/ SP ANG ARRANG LENG EP)
(setq on (getvar "osmode"))
(setvar "osmode" 0)
(command "undo" "m")
(setq SP
(getpoint "\n Arrow start point"))
(setq ANGP
(getpoint SP "\n Arrow angle"))
(setq ARRANG (angle SP ANGP))
(if (= 0.0 (getvar "DIMASZ"))(setq LENG 2.0) (setq LENG (getvar "DIMASZ")))
(setq EP (polar sp arrang (* LENG (getvar "DIMSCALE"))))
(command "PLINE" SP "W" "0.0" (* 0.333 LENG (getvar "DIMSCALE")) EP "W" "0.0" "0.0" "ARC")
(setvar "osmode" on)
)

 

Will a splined leader work as a sufficient replacement? If so you can
use the associative leaders built into cad. We use them in favor of our
old arc leaders but they do not draw true arcs...

kemp

 

we try to avoid splines. they don't react that well with hatch, and a
few other things (that and as you say, they don't draw true arcs).

 

In that case the only solution I can think of is to use reactors to
redraw the leader for you. I have not had any luck creating a reactor
that works in situations like this, hopefully someone else has a good
solution....

kemp

 

I'm having a little trouble imagining why:
1) it would matter how a leader reacts with hatch (I can't picture using a
leader as a hatch boundary, but maybe there's some other hatch-related
issue); or
2) a true arc for a leader is any better than a spline.

Spline-format leaders work great. It doesn't seem worth the enormous
trouble you would have to go through to get an arrowhead and an arc to react
appropriately to each other and to a piece of Mtext, and do what you want a
leader to do.

Kent Cooper, AIA

 

no you wouldn't use the leader as a hatch boundary, but we have found that
even having a spline IN a hatch boundary can cause problems
as to arc vs spline. arc's look 100x better than splines do.