Puzzle, find midpoint of square with filleted corners

I have a drawing that we recieved from an architect. In this drawing, there
are numerous (200+) steel columns shown in plan. (ie a rectangle / square
with filleted corners). Unfortunately, these are all drawn as polylines.
Since all of our beams and our column insertion points correspond to the
center of these blocks, I am looking for a quick way to either insert a
block/point/draw a line at the middle of the polylines. Any suggestions on
how to go about getting the midpoint of a closed polyline?

TIA

Casey

 

If you can use vla*- functions, then select the polyline turn it into a vlax-object, the grab the centroid point.

Tim

 

Just off the top, I'd look at the Bounding Box of those polylines. Here's
someone's (credit to you, whoever you are) code. Use a little math to
deduce the center:

(vl-load-com)
(setq ent (car (entsel))
obj (vlax-ename->vla-object ent)
info (vla-getboundingbox obj 'minpt 'maxpt)
llc (vlax-safearray->list minpt)
urc (vlax-safearray->list maxpt)
llc (list (- (car llc) 1.0)(- (cadr llc) 1.0))
urc (list (+ (car urc) 1.0)(+ (cadr urc) 1.0))
lrc (list (car urc)(cadr llc))
ulc (list (car llc)(cadr urc)))
(command "PLINE" llc lrc urc ulc "C")

Len Miller

 

Krupacadd Solutions http://www.KRUPACADD.com// has a FREE set of utilities
that can be downloaded. One of the utilities is a point location aid that
can select the midpoint between two points. You could use this utility with
running osnaps. Give it a try.

 

Thanks, but I have one of those already, I just don't want to pick it 200
times.

 

Thanks,

I think this will work very well to get me started in the right direction.


Casey

 

the columns are sole or alone polyline or they are polyline in a block.??

 

Just polylines, No blocks :-(