add elips in polyline

hi

Maybe a silly question, but how can I add an elips in a polyline? I've tried
pedit --> join but I get the message that only arc circel or line can be
added. Trying to explode the elips doesn't work out.

Can anybody please help?

Thanks in advance
Wouter

 

ellipse is actually a spline. you must trace over it with polylines or
arcs.. I use divide and set my spaces pretty close then set my Osnap on node
& go. HTH
Rob

 

You can't use a true ellipse. Instead, set PELLIPSE to 1 to force AutoCAD to
approximate your ellipse with a polyline; you can then trim, PEDIT, etc. to
your heart's content.
___

 

Try to use boundary.
Draw the ellipse, draw your pline, than make a new boundary and it wil
create a region.
It's not a polyline but if you need it for hatching it works.

Jan

 

It's impossible join an elips with a polyline but I have a lisp command that
convert a spline into a lwpolyline...
The name is CONVSPL

syntax:
(load "convspl") <return>
CONVSPL <return>

(defun C:CONVSPL (/ gru index index2 color ltype P0 nspline ent lisent)
(setvar "CMDECHO" 0)
(setq gru (ssget)
index 0
nspline 0
)
(repeat (sslength gru)
(setq ent(ssname gru index))
(if (= (cdr(assoc 0 (entget ent))) "SPLINE")
(progn
(command "SPLINEDIT" ent "REFINE" "E" 20 "X" "X")
(setq lisent(entget ent)
color(cdr(assoc 62 lisent))
ltype(cdr(assoc 6 lisent))
index2 0
P0(cdr(assoc 10 lisent))
)
(command "LAYER" "SET" (cdr(assoc 8 lisent)) "")(command
"PLINE" (trans P0 0 1) )

(repeat (length lisent)
(if (= (car(nth index2 lisent)) 10)
(command (trans (cdr(nth index2 lisent)) 0 1) )
)
(setq index2(1+ index2))
)

(command)
(if (/= color nil)
(command "_CHPROP" (entlast) "" "COLOR" color "")
)

(if (/= ltype nil)
(command "_CHPROP" (entlast) "" "LTYPE" ltype "")
)
(entdel ent)
(setq nspline(1+ nspline))
)
)
(setq index(1+ index))
)
(princ "\nConvertite ")(princ nspline)(princ " spline.")(princ)
)

 

Thanks you all.
I'll try it out!

Wouter

 

I'm a little confused, how do you use this?

I copeid the bit after "(defun...." into notepad and saved it of as an *.lsp
I loaded the lsp into acadwin.

I type convspl at the command line, it promtps me to select something, which
I do (an ellipse) it I press enter and it exits the routine. Nothing has
happened. What am I doing wrong?


DJE

 

The LISP "convspl" converts a spline into a polyline. It can not be used
to convert an ellipse into a pline.

Juergen

 

Again, depending on the accuracy required, a SPLINE is created when you try
to offset an ellipse. Offsetting the offset back gives you an
*approximation* of an ellipse, which could then be used by this routine to
make a polyline......

 

Wouldn't it be easier to follow Pauls suggestion and draw the ellipse
while PELLIPSE = 1? So you get a pline and can join it to other
lines/polylines/arcs.

Juergen