[GRASS5] Re: [GRASSLIST:9943] Re: compiling grass for cygwin

Maciek Sieczka werchowyna at epf.pl
Sat Jan 21 14:54:56 EST 2006


Firts things first:
Please note I made a mistake in my previous email when I wrote about
building GDAL/OGR with OpenDWG support - that's another thing, if you
want to have DXF/DWG support in OGR. I apologise for confussing you.

On sob, 2006-01-21 at 16:41 +0100, Wolfgang Zillig wrote:
> OK, that seems to be one way to do it. But I don't really understand why 
> it must be that complicated to get all these things running :-((

Mostly it's because the OpenDWG is not a free software, so precompiled
OpenDWG cannot be shipped with Linux distros or it's source included in
GRASS. Each interested party has to get the OpenDWG lib on their own by
signing the license with Open Design Alliance and build Grass
--with-opendwg then. This is a pain indeed.

As DXF/DWG support is problematic to achieve in Grass 6.1, it would be
indeed a valuable input for Grass 6.1 to have import/export modules for
these formats not dependent on OpenDWG. There is v.out.dxf currently in
6.x. Maybe the 5.x v.in.dxf, v.in.dxf2 and v.in.dxf3d could be a protope
for DXF import? Or the QCAD read/write DXF support? Either one would
require an inclined developer.

But what about DWG? On freegis list I read a note on
http://www.pythoncad.org project who where supposed to be developing a
free dwg lib. I found out the person in charge might be Art Haas of
pythoncad. The news are not optimistic yet:

A followup in this thread lead me to a link:
Perl/Python/Ruby code. The page says "... capable of converting from dxf
to dwg, dwg to dxf, dxf to svg, svg to dxf, pdf to postscript...". Wow.
Maybe this is a chance for _really_ open dwg support?

A Java approach to DWG, "...a partial port from the Pythoncad DWG
reading classes by Art Haas". But the homepage
http://jdwglib.sourceforge.net looks abandoned. Temporarily?


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