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	Mon, 29 Jun 2015 14:15:32 -0700 (PDT)
Date:	Tue, 30 Jun 2015 00:15:30 +0300
From:	"Vladimir Zhbanov (vzhbanov AT gmail DOT com)" <geda-user AT delorie DOT com>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] gEDA/gschem still alive?
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On Mon, Jun 29, 2015 at 01:44:27PM -0600, John Doty wrote:
...
> >> It would be another factoring error to build in too much meaning to
> >> attributes at the schematic editor level. A lot depends on downstream
> >> flow. Geda-gaf supports many downstream tools. Simulation needs
> >> different network attributes than layout does. In geda-gaf, the
> >> netlister carries the responsibility for assigning semantics to the
> >> primitives. Making the editor aware of semantics detracts from its
> >> flexibility.
> >> 
> > 
> > That is generally true, you told us that some years ago, and it is a
> > fine excuse to let gschem as it is. Unfortunately, some years ago
> > sch2pcb was really stupid. It transfered footprints from schematics to
> > PCB board, all stacked on top of each other, and gave us only net
> > connect information. That is really a mess for larger boards. We loose
> > too much information: Which bypass capacitor is for which OpAmp? Which
> > trace is for high current. The layouter guy has to manually recover this
> > information. One simple improvement is grouping elements -- for example
> > all components close to an OpAmp on schematics should be placed as a
> > group on PCB too. And there should be an option in PCB program to
> > highlight all elements of this group, so that we can check if they are
> > placed well.
> 
> This is more a PCB problem than a geda-gaf problem. It’s trivial to
> add an attribute like keep-near=U1 to a capacitor. That’s an advantage
> of a factored tool that’s agnostic about semantics. But since PCB
> doesn’t compose complex objects from simpler objects, there’s no way
> to express this in a netlist for PCB. The problem goes beyond
> graphics.

I've already wrote a script for gschem for searching and selecting
components above in the thread. Nothing hinders using of the same approach
and outputting a script for pcb with 'Select(ElementByName)' to select
what you want and doing other things, e.g. 'ChangeSize(...)' with it.

Cheers,
  Vladimir

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