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Re: gEDA-user: RFC using SVG with semantic markup as an EDA format

   On Apr 11, 2011, at 8:51 AM, Peter Clifton <[1]pcjc2@xxxxxxxxx> wrote:

   On Sun, 2011-04-10 at 21:55 +0100, Andrew Seddon wrote:

     I am exploring the idea of using the Scalable Vector Graphics
     standard

     as an EDA format.

     [2]https://github.com/seddona/svgparts

     Would be interested in your thoughts, there's a little more

     explanation on my blog.

     p.s this is probably a topic for -dev but I don't access...

   The idea of basing future formats on SVG has been thought of, floated,
   and discussed before now. I don't recall whether any conclusions were
   reached. I personally have mixed feelings, but am leaning towards the
   the thought that it is a good idea - but with a healthy dose of
   uneasiness about it as well.

   My thoughts on this topic are that SVG should be the common format and
   that converters are made.  The converters job would be to map the
   standardized SVG to the symbols.

   I propose that there be levels of the svg symbols.  Level one only has
   lines and arcs, level 2 adds text, level three adds polygons and
   circles...  And so on.

   It would be the converters job to map the symbols and footprints to the
   EDA package you are using.

   I'm not as convinced of the idea for PCB layouts / footprints. I'm just
   not certain the drawing model is constrained enough. to match real
   world
   geometry demands.
   The main niggle is that SVG is more expressive than a generic PCB
   layer.
   Things like colours and gradient fills are just not meaningful in
   copper. That means we need to act intelligently if something adds
   those.
   Supporting complex geometry primitives which SVG would bring also means
   internal processing in PCB might get more difficult.

   Hence the job of the exporter to map properly to layers.  Ignoring or
   erring on higher level constructs.

   --
   Peter Clifton
   Electrical Engineering Division,
   Engineering Department,
   University of Cambridge,
   9, JJ Thomson Avenue,
   Cambridge
   CB3 0FA
   Tel: +44 (0)7729 980173 - (No signal in the lab!)
   Tel: +44 (0)1223 748328 - (Shared lab phone, ask for me)

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References

   1. mailto:pcjc2@xxxxxxxxx
   2. https://github.com/seddona/svgparts
   3. mailto:geda-user@xxxxxxxxxxxxxx
   4. http://www.seul.org/cgi-bin/mailman/listinfo/geda-user


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