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Date: Wed, 26 Aug 2015 15:25:50 -0400
Message-ID: <CAM2RGhTqdvbwNrd78EQMU=+BTG=EZC1CB+E9ddnco8Mm0CemQQ@mail.gmail.com>
Subject: Re: [geda-user] pcb file format
From: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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On Wed, Aug 26, 2015 at 2:03 PM, DJ Delorie <dj AT delorie DOT com> wrote:
>
>> Exactly. PCB currently does this only it does not have all the
>> information in a unified structure.
>
> It's in 'extern PCBType *PCB;' so while the structure may be a little
> obtuse, it's certainly unified.

Sorry mis spoke/typed. Look you all know what my view is on this and
most of you share it.

>> It does iterate through the list of connected items and build a
>> netlist but things like design rules are apparently processed in a
>> messier way.
>
> Because the concept of "connected" in pcb becomes a geometry problem,
> not a logic problem.  DRC is messy because it's a messy problem to
> solve, with many solutions, and the one originally chosen wasn't
> neccessarily the one we might have chosen today.
>
> (btw: drc is handled by running the netlist code multiple times, so
> that "but" doesn't work that way either - it's the *same* code ;)

Ok

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