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Subject: Re: [geda-user] The nature of gEDA layers
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From: John Doty <jpd AT noqsi DOT com>
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Date: Sat, 30 Jan 2016 14:42:02 -0700
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On Jan 30, 2016, at 2:09 PM, Stephan B=F6ttcher <geda AT psjt DOT org> wrote:

> DJ Delorie <dj AT delorie DOT com> writes:
>=20
>> Because this part:
>>=20
>>> why not provide a generic mechanism
>>=20
>> is harder than you think.
>=20
> It will certainly not be easy.
>=20
> I have no use for b/b vias.  But I see that a mechanism that supports
> more generic vias may lead to a delevelopment that allows things I do
> care about.

I note that in Osmond PCB, vias and footprints are simply groups of =
drawing primitives with connectivity. There=92s no fundamental =
distinction. Vias wind up having refdeses.

>=20
> If somebody implements b/b vias in pcb, that code adds a lot of
> complicated special cases to the program, and gains nothing but b/b
> vias.  That can be done in reasonable time.  I won't care.

Done right, no complicated special cases are needed. Consider gschem: it =
needs no special case to handle, say, a dual-control pentode. You simply =
draw it with the same primitives you use for a resistor.

>=20
> If a consensus will be reached to build a more generic foundation in =
the
> data structures and continue to add features on top of that, I might
> start hacking on pcb myself.  That path will be longer, but reach
> farther.
>=20
> --
> Stephan
>=20

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com



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