topic Re: shortcut of change entity type of arc, ellipse and circle, into poly line. in AutoCAD Forum

shortcut of change entity type of arc, ellipse and circle, into poly line.

Anonymous — Tue, 07 Apr 2020 06:33:42 GMT

Hi everyone,

Is there any shortcut command to change the entity type of arc, ellipse and circle into poly line, just like in micro station software?

If non, why not the auto cad developer people add it? As in the change properties dialog box for easily modifying.

Thanks

Alex

Re: shortcut of change entity type of arc, ellipse and circle, into poly line.

ilia.borisov — Tue, 07 Apr 2020 07:12:05 GMT

For circle you can use workaround boundary command for others i dont know. Just curious, why do you want polylines from these objects?

Re: shortcut of change entity type of arc, ellipse and circle, into poly line.

imadHabash — Tue, 07 Apr 2020 08:57:03 GMT

Hi,

>> Is there any shortcut command to change the entity type of arc, ellipse and circle into poly line

check this :

Arcs ... if you use JOIN command for two arcs it will convert to one polyline .
Arcs .... start the POLYLINE command, then type A for Arc.
Ellipse ... Set the PELLIPSE system variable to 1 (to draw polyline ellipses). >> Click <<
Circles .... start the POLYLINE command, then type A for Arc. when you do that, you can create a circle by simply using your POLAR tracking to make two "arcs". ( see below image )
Circle .... type BOUNDARY command then pick a point inside the circle. AutoCAD will create a polyline on top of the circle.

Also ... there are many plug-ins and lisps out there that can do what you're asking for . >> Click <<

Re: shortcut of change entity type of arc, ellipse and circle, into poly line.

Kent1Cooper — Tue, 07 Apr 2020 13:10:55 GMT

For ARCs, just use PEDIT, with the Multiple option if you want to do more than one, and select them, answer Yes if asked whether to convert it/them to Polyline(s) [it depends on the setting of your PEDITACCEPT System Variable], then hit Enter again to exit the command, and it/they will be converted.

For CIRCLEs, instead of Boundary that will add a Polyline, you can use CirclePolylineSwap.lsp and its C2P command, available >here<., which will replace the Circle with the equivalent Polyline of two half-circle arc segments.

For ELLIPSEs, be aware that the shape will change slightly -- a Polyline cannot precisely follow the shape of an Ellipse, because an Ellipse's curvature has a continuously varying radius, whereas a Polyline "equivalent" has to be made of arc segments, each with its discrete radius. One way to do it, in which you get a choice of precision, is to OFFSET the Ellipse in either direction, then OFFSET the result back in the other direction. The result will be a SPLINE, and in the SPLINEDIT command you have the option to convert it to a Polyline.