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Re: DXF and other CAD file formats [message #28329 is a reply to message #28300]

Tue, 04 December 2001 09:37

Dick Jackson
Messages: 347
Registered: August 1998

Senior Member

"Georg Wiora" <georg.wiora@DaimlerChrysler.com> wrote in message
news:1103_1007453886@rtulmrb142...

> Thank you Rick! I tried it, but it did not work. I got a hint
> from RSI that the polyline feature is not implemented in
> IDLffDXF yet.
> There seems to be another problem with IDLffDXF: The point
> coordinates I supplied to the object are clearly 3
> dimensional, but the object displayed with the XDXF procedure
> is flat!
>
> So there is either a lack of documentation for the IDLffDXF
> object or a lack of implementation :-(

Looking a little deeper, it really is ignoring whatever you put as the
connectivity. I did this after running your Write_DXF_Lines:

IDL> toView = Get_DXF_Objects('test.dxf')
IDL> o=toview->get()
IDL> xobjview,o

It looks like a flat polyline shaped like this: ] :-)
But this is what's surprising...

IDL> o->getproperty,polylines=poly
IDL> print,poly
5 0 1 2 3 4

... so it has five vertices, four segments, and...

IDL> o->getproperty,data=data
IDL> print,data
0.00000000 0.00000000 0.00000000
1.0000000 0.00000000 0.00000000
1.0000000 1.0000000 0.00000000
1.0000000 1.0000000 0.00000000
0.00000000 1.0000000 0.00000000

The five points are there, but they're all flattened to Z=0. Now I'm not a
fluent reader of DXF, but looking into the DXF file, it looks like there's
something called an AcDb2dVertex, here's a sample:

VERTEX
5
29
100
AcDbEntity
8
0
100
AcDbVertex
100
AcDb2dVertex
10
0.0
20
1.0
30
1.0
0

It looks like it *should* be the point [0,1,1] (that's XYZ at the end), but
it ends up treated as [0,1,0] when read in. I'd guess this is where
PutEntity is making a mistake.

Sorry, this probably doesn't help a lot, but it's curious.

Cheers,
--
-Dick

Dick Jackson / dick@d-jackson.com
D-Jackson Software Consulting / http://www.d-jackson.com
Calgary, Alberta, Canada / +1-403-242-7398 / Fax: 241-7392

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[Message index]

		DXF and other CAD file formats By: Georg Wiora on Thu, 29 November 2001 06:15
		Re: DXF and other CAD file formats By: Dick Jackson on Tue, 04 December 2001 09:37
		Re: DXF and other CAD file formats By: Georg Wiora on Tue, 04 December 2001 00:18
		Re: DXF and other CAD file formats By: Dick Jackson on Mon, 03 December 2001 10:21
		Re: DXF and other CAD file formats By: Rick Towler on Mon, 03 December 2001 09:45
		Re: DXF and other CAD file formats By: Martin Downing on Thu, 13 December 2001 02:27

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