measure ellipse outline

Hi

Can I convert a section of an ellipse outline to polyline so that I can see it's length from Properties? And why Properties does not show the length of a spline?

Thanks.

It seems that you don't need to convert it to pull any information off of it, though there is a command that allows you to turn an ellipse into arc segments.

The command is PELLIPSE, default is 0, and 1 sets to polyline segments. If you change the PELLIPSE to 1, you can see the circumference or length from the properties dialogue box.

You can also us use the LI (short for LIST) to display the properties of the ellipse. It will include the length, if its a section or circumference if its closed.

Here is an example of an ellipse listed. Its XY is 12" x 6":

ELLIPSE Layer: "0"

Space: Model space

Handle = 89cc

Area: 56.55 sq in (0.39 sq ft)

Circumference: 2'-5 1/16"

Center: X = -0'-0", Y = -0'-0", Z = 0'-0"

Major Axis: X = 0'-6" , Y = 0'-0" , Z = 0'-0"

Minor Axis: X = 0'-0" , Y = 0'-3" , Z = 0'-0"

Radius Ratio: 0.50000

Hi Secretagdam

Thank you for your information

You could use vlax-curve-getendparam like so to get the length:

(defun c:getlen    (/ e rjp-getlength)
 (defun rjp-getlength (ent / ep)
   (if    (vl-catch-all-error-p
     (setq ep (vl-catch-all-apply 'vlax-curve-getendparam (list ent)))
   )
     0
     (vlax-curve-getdistatparam ent ep)
   )
 )
 (if (setq e (car (entsel "\nSelect object to measure: ")))
   (alert (rtos (rjp-getlength e)))
 )
 (princ)
)

Thank you very much, super-secret Secretagdan !

I was searching for the same answer as Dreamer.