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To: "Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: Re: [geda-user] The new to do
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On Mon, Jul 13, 2015 at 11:24:37PM +0000, Evan Foss (evanfoss AT gmail DOT com) [via geda-user AT delorie DOT com] wrote:
> On Mon, Jul 13, 2015 at 9:37 PM, Dave McGuire (mcguire AT neurotica DOT com)
> [via geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> > On 07/13/2015 05:25 PM, John Doty wrote:
> >>> Actually, the functionality I envision IS a gschem issue, albeit a
> >>> very minor one.  I've seen a lot of schematics (I think done in
> >>> Eagle but I'm not sure) that have something that sorta looks like a
> >>> lollipop pointing to a trace, with "20mils" or whatever in the
> >>> circle.  Of course I can (and do) attach any arbitrary attribute to
> >>> anything, and I think this is one of gschem's great strengths, but
> >>> there needs to be (IMO) a bit of GUI work for this feature as
> >>> well.
> >>
> >> No work at all in either gschem or the gnetlist front end is needed
> >> to do that. There is already a function in the gnetlist back end API
> >> that rejoices in the name
> >> "gnetlist:graphical-objs-in-net-with-attrib-get-attrib". It retrieves
> >> an arbitrary attribute from a “graphical=1” symbol attached to a net.
> >> So, draw your lollipop as a symbol, give it attributes graphical=1
> >> and trace-width=20mil. Attach it to your net.
> >
> >   Ah-HA!  Most excellent, thank you!
> 
> Fantastic! Thank you!
> (I now have to wonder how much of this stuff is in the manual/wiki)

It works well, I've used it for the only layout I've subcontracted to the
person which should be doing this job in our institute (but she's in the
other place 1500km from here). Actually I wrote a gnetlist backend for
CADSTAR which is what she uses (it works, but uses a lot of local
conventions so is probably not publishable).

In any case, I've attached my symbols for 50Ω tracks and differential
pairs. The differential pair is more cumbersome to use (I need to add
a unique bus_name attribute to each differential pair symbol for CADSTAR
not to make a mess of it.

The attribute net_route_code is for CADSTAR's use.

Caveat: when these symbols are attached to net that traverse hierarchy
boundaries, they have to be attached to the highest level of the
hierarchy, otherwise gnetlist seems to ignore them (can't remember
the details, it was 3 years ago).

    Gabriel