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From: al davis <ad252 AT freeelectron DOT net>
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Subject: Re: [geda-user] [dev] Gnucap and Google summer of code.
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On Sat, 29 Apr 2017 09:59:40 +0200 (CEST)
gedau AT igor2 DOT repo DOT hu wrote:
> Any news on this? I'm finishing the current portion of the layer rewrite 
> this weekend. I could find some time on a gnucap exporter before the 
> release, but I need to know the answers (especially the parameter 
> extraction part) before I start.

In circuit simulation, it's all transmission lines.  All that you list
is just different shapes.  What gnucap does with the data, I don't know
until I see it.

For arbitrary shapes, think SVG, but it isn't quite SVG.  Use SVG
parameters in a Verilog syntax, except that where SVG uses absolute
coordinates, Gnucap/Verilog wants relative coordinates such that when a
shape is moved it stays the same.  The absolute position is specified
through the $xposition and $yposition parameters.

Ideally, you would be able to both export and import this format.  For
now, export only will enable some simulation.  If you can import too,
you have a way to test it by doing a round trip.