Re: gEDA-user: translation standards (was: fritzing )

[Steve Meier <smeier@xxxxxxxxxxxxxxxxxxx>]

I believe the electronics industry has already centered on the PADs
ASCII file format which has the netlist, components, foor print's,
layers, lines, vias etc.

I have bumped into pcb and assembly shop requests for this a few times
where they use the information for programming their pick and place
equipment as well as their flying probe testers. Plus if you wan't to
translate projects back and forth between commercial cad programs this
seems to be the most commonly supported format.

Steve Meier

On Wed, 2009-05-13 at 16:01 -0500, John Griessen wrote:
> al davis wrote:
> 
> > My proposal does consider placement, which should be enough.
> > 
> > It is essentially a netlist format.  That's the idea.
> 
> How about having a netlist format that holds footprint center, plus pad/pin centers
> that are defined as center of main part of a pad and center of hole circles, and also
> pad numbers?
> 
> That would make a netlist skeleton version of a footprint.
> 
> I think Brendan of the fritzing project wants the descriptive artwork lines too, though.
> 
> Those could be defined by a generic standard as vector line segments relative to a center zero
> easily enough.  For centroid based drawings like pcb and RS274-X use, a line width number would be
> part of it too.
> 
> But then when you get to square pads that are based on a zero length line segment what do you do?
> 
> Most 3D models used now are edge and surface based, or if 2D like postscript, edge and outline based.
> 
> Square pads suggest using outline based graphics and round suggests centroid based, so a standard would need both.
> Defining outline based graphics in output to the standard format would mean any other importing to centroid based
> would need to convert, and them you get into questions of "can you do it losslessly?"
> 
> John Griessen
> 
> 
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