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	Mon, 31 Oct 2016 09:58:36 -0700 (PDT)
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From:	"Erich Heinzle (a1039181 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date:	Tue, 1 Nov 2016 03:28:36 +1030
Message-ID:	<CAHUm0tOkNZiSLDhGT58NwPz_Yj0LqTO34xpk2WobdrJ06aWNNw@mail.gmail.com>
Subject:	[geda-user] [pcb-rnd] Kicad s-expression import and export now working
To:	geda-user <geda-user AT delorie DOT com>
Reply-To:	geda-user AT delorie DOT com

Following the recent implementation of the IO module for kicad legacy
format export of layouts and footprints, an additional IO module has
been implemented to allow kicad s-expression format layouts to be
imported and exported.

The kicad s-expression file format is the newer format used by kicad.

Exported dimensions are preserved without rounding, with the only
significant discrepancies arising with:

1) text, since kicad uses the Hershey sans stroke font for footprint
labelling, but a bitmap font for board text, quite unlike gEDA
pcb/pcb-rnd's text use.

2) polygons, since kicad treats polygonal zones as components with or
without fill that have an attached net and also influence the
clearance behaviour of vias within its area. This means that users
will need to adjust the clearance of features within a polygon on a
feature by feature basis. Import/export of polygon cutouts is yet to
be implemented.

3) obround (oval), trapezoidal, and rounded corner rectangular pads,
supported by kicad, are simply converted to circle, square and
rectangular pads, respectively.

Some screenshots:

http://imgur.com/a/6T5Vu

http://imgur.com/a/4gVUu

Preliminary testing has been encouraging, but more testing would be
appreciated. This is the first release, and further round trip testing
is planned.

All that is required to test at present is, in the trunk directory:

svn up
./configure --debug --buildin-io_kicad
make
../pcb-rnd foo.kicad_pcb &

The modular nature of the pcb-rnd code has enabled these plugins to be
implemented quite quickly, and Igor2 has been very helpful in
facilitating these efforts.

Regards,

Erich.

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