Can ellipses convert to polylines?

[Anonymous]

Is there a method of converting ellipses to polylines?

[JDMather · Accepted solution]

pellipse = 1 before creation

[Alfred.NESWADBA]

Hi,

... and for existing ellipse objects you might save these back to DXF12.

- alfred -

[rkmcswain]

....another way, WMFOUT and WMFIN

(ins pt = UL of viewport, and scale 2X during the WMFIN)

[braudpat · Accepted solution]

Hello

If you have many real Ellipses to convert to Plines !?

The "marvellous"  EL2PL  VLisp routine from (gile) - Gilles Chanteau

will help you ... because it can convert many ellipses in one shot !

Bye, Pat

[marknielsen]

that lips was just the thing i was looking for.... THX a million

[Thermeco-Cad]

All good, except the full Ellipse. It cannot convert the full ellipse to something other than ellipse.

[Alfred.NESWADBA]

Hi,

>> All good, except the full Ellipse

Have you seen post 3 in this thread?

- alfred -

[Thermeco-Cad]

Thanks for your reply,

Yes, I did. It's not a perfect solution for me.

[rculp]

OFFSET the ellipse a set amount (keep it small), erase the original then offset the copy back to the original.  Now you have a spline curve, use SPLINEDIT to convert it to a PLINE, the higher the precision the more vertices in the pline.

[pancarolinapa]

This worked for me on partial ellipses, but doesn't work on complete ellipses.  Any ideas?

[Alfred.NESWADBA]

Hi,

>> but doesn't work on complete ellipses.  Any ideas?

Have you seen post 3 in this thread?

- alfred -

[pancarolinapa]

Yes,thank you, but I'm reluctant to try that because I'm not sure how that will affect other objects in the file, and I don't have hours to play with it!  I ended up just tracing the ellipse with a new polyline, since absolute accuracy was not necessary, and deleting the ellipse.  

[Alfred.NESWADBA]

Hi,

>> how that will affect other objects

Not at all. Using command _DXFOUT with option to "export selected" you can chose the ellipse to export, then use command _INSERT to get it back into your drawing, but then as polyline. No need to export all and reimport all.

- alfred -

[fg]

Split the ellipse in half first using trim command.  then use the lisp routine.  Then mirror the arcs.  If you want to combine the arcs at the split you can since they are the same radius.

[Kent1Cooper]

---

@pancarolinapa wrote:

This worked for me on partial ellipses, but doesn't work on complete ellipses.  Any ideas?

---

Old thread, but anyway....  Another approach:  Use WobblyPline.lsp with its WPL command, available >here<.  See in particular the paragraph beginning 'You can even do "un-randomized" things....'

Call up WPL, use the EXisting-object option, choose whether you want to Delete the original, select the Ellipse [partial or full], and give it a reasonable number of segments [a multiple of 4 will work best -- 16 or 20 or 24 generally seem to be good, depending on the ratio of the Ellipse and the precision you need].  When it asks for "Maximum displacement as percentage of average segment length:" give it 0 [zero], which will make a Polyline of line segments, all of whose vertices will lie on  the Ellipse at regular spacing around it.  Then use PEDIT on the result, with the Fit option to turn it into arc segments.  Depending on the precision you need, you might like the result of the Spline option instead, but that will pull it inward slightly [by how much depends on how many segments you asked for in WPL].

[douglas.shortCM2W5]

None of these solutions is an actual solution.

WMFOUT?

What?

A better way to explain the solution is to actually EXPLAIN the solution.

Dropping a command that is probably new to an average user without any explanation is no help at all.

[jmenezesFXKA9]

I know this was a while ago, but you saved my life!  After that all the steps I exploded the polyline and ended up with hundreds of straight lines, exactly what I need so the company's machine could read the DXF.  Thanks a million!!

[sachinsrao14]

There is an alternative i have found to convert ellipse (for trimmed ellipses) into polyline in Autocad.

Step 1: Close the ellipse by drawing a LINE. 

Step 2: Use JOIN cmd and select the ellipse and line and Press Enter.

Now it will be in SPLINE form.

Step 3: In drop down of spline , Convert Spline to Polyline.

Step 4: BREAK the drawn line from Polyline using BREAK cmd and Delete the drawn Lines.

Hence Conversion of Ellipse to polyline will be achieved.

[tanveerbhatti447]

Sir, Thanks a lot its working