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        Sun, 20 Dec 2015 07:32:12 -0800 (PST)
Date: Sun, 20 Dec 2015 16:32:08 +0100
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] was XML file format (parametric sheets, sub
 circuits)
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> I'd like to be able to do, gschem:
> 
> . give parameters to subsheets, like
>   output is to be 12V select suitable resistor devider
>   this filter has this freq., select suitable components
> 
> there should be no reason that I must copy the sheet and exchange a few 
> small values

It would definitely make sense for filters and others with parameters but how to implement something easy to understand and use i have no idea.

> Pcb:
> 
> . make theese things a group
>   set values (e.g. refdes) from paramaters
>   move everything in the group as one, like it remebers selections

Yes sub circuits or sub layouts make sense. What would be needed is a selector to select to which sub layout added objects will belong, default sub layouts would probably be sub sheets. Then they belong to a sub layout they could be selected and moved or replaced with a modified copy. I have made two circuits boards there I copied and reused same layout data the last months.

I think a selector to select sub layout would be rather simple to implement although I looked into file format and do not think it is possible to add the necessary information to objects or list of objects without a change of file format.

> this track has with = width of another track
> this track has constant distance to another track from here to there
> width of track = current2width(2A);
> track_parameters = impedance2track(50Ohm);

To calculate clearance from net maximum voltages and width from net or segment maximum current would be useful. A first step is to get values into pcb and then values or route style could be selected from these values then adding a connection.

> Aspö Data
> Lilla Aspö 148
> S-742 94 Östhammar
> Sweden
> +46 173 140 57


Nicklas Karlsson