### Author Topic: ellipse to arc  (Read 1113 times)

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#### jack91066

• Mosquito
• Posts: 11
##### Re: ellipse to arc
« Reply #15 on: March 20, 2017, 04:53:25 pm »
sir Gile's

when i complete all is process that arc object divide to much object

As said roy_043, when simply explode the polylines generated by EL2PL and so get  arcs to much. i don't need to much arc object.
if have any idea

#### gile

• Water Moccasin
• Posts: 2094
• Marseille, France
##### Re: ellipse to arc
« Reply #16 on: March 20, 2017, 06:06:30 pm »
Except when the major axis equals the minor axis (i.e. the ellipse is a circle), you cannot approximate an ellipse with a circle, so you can't approximate an elliptical arc with a single circular arc.
It is a geometric impossibility.
« Last Edit: March 20, 2017, 06:12:13 pm by gile »
Speaking English as a French Frog

#### Lee Mac

• Seagull
• Posts: 11852
• AutoCAD 2015 Windows 7 London, England
##### Re: ellipse to arc
« Reply #17 on: March 20, 2017, 06:36:34 pm »
Except when the major axis equals the minor axis (i.e. the ellipse is a circle), you cannot approximate an ellipse with a circle, so you can't approximate an elliptical arc with a single circular arc.
It is a geometric impossibility.

This ^^

#### ScottMC

• Mosquito
• Posts: 10
• ...can't LISP without it..
##### Re: ellipse to arc
« Reply #18 on: November 19, 2017, 10:12:48 pm »
That is why long ago I set my pellipse to "0" to get it to be a pline (editable to "fit") and the results are near to perfect. Do a copy@ to verify.