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Subject:	(gschem <--> pcb communication) Re: [geda-user] A new PCB file format
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From:	"M. J. Everitt (m DOT j DOT everitt AT iee DOT org) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Date:	Thu, 7 Jan 2016 17:04:15 +0000
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Sounds good Dan .. is this in public release or some branch/fork somewhere?

MJE

On 07/01/16 16:35, Dan McMahill (dan AT mcmahill DOT net) [via
geda-user AT delorie DOT com] wrote:
> On 1/7/2016 12:20 AM, Marvin Dickens (mpdickens AT gmail DOT com) [via
> geda-user AT delorie DOT com] wrote:
>> Hi Everybody,
>>
>> If your looking at tuning up or otherwise redesigning the file format
>> for PCB
>> I would really like gschem to understand the PCB file format and
>> visa-versa.
>> What I would like to be able to do is have a PCB layout up at the same
>> time I
>> have the schematic for that design up in gschem. If I select any part or
>> portion
>> of the layout in PCB that part or portion is visually highlighted in
>> gschem and
>> visa-versa.
>>
>
> people probably aren't aware of this, but I prototyped that
> functionality and the code has been in gschem for 5 or 6 years now. 
> You can select an element in the schematic and have it select in pcb. 
> I may have even gotten the opposite working too but can't recall. 
> Feel free to try it out and move the ball forwards.
>
>
> Maybe it is time to mention one of my wishes and what steps I had
> taken to get there.
>
> gschem has scheme embedded in it.  Setting aside the question of if
> scheme is the right language, the important piece is we have a script
> interface into the compiled portion.
>
> With the script interface, you can define additional menus and menu
> items.  You can also add hooks that get executed when things happen.
> What sort of thing?  Component Selection!
>
> The idea is gschem stays flexible and not tied to a particular backend
> but you provide enough of an API (scheme or other) to where you can
> load a module at run-time which puts gschem into a mode targetted at a
> particular backend (pcb, spice, gnucap, etc).  By isolating the
> details of the particular backend into a module which is loaded when
> the user requests it, we can do all sorts of cool things.  Picture a
> simulation environment where the simulator module has a list of all
> the supported analysis types and the associated parameters.  Now
> suppose gschem includes a dynamic attribute editor dialog.  The plug
> in just says "here gschem, here is a list of simulations and the setup
> variables they need, give me a dialog for the user".  At least some
> code has been written to make this possible.  Note that we have an
> existance proof in PCB for that.  The export dialog boxes are built on
> the fly based on a particular struct that the HIDs use.
>
>
> Anyway, take a look at:
>
> gschem/scheme/pcb.scm
>
> load it and try.
>
> It is not perfect for sure but I think it was a step in the right
> direction.  Again, one of the guiding principles was to make sure
> gschem includes functions that are needed (like a file selection
> dialog, hooks to select/deselect, generic attribute editor dialog,
> etc).  Then use those features to allow a particular flow to be
> customized.  This maintains the current workflows, maintains
> flexibility, doesn't tie gschem to any particular backend, but ENABLES
> flow specific functionality as add in's.
>
> One barrier is the one of nets.  gschem unfortunately does not know
> about connectivity (or didn't last I checked).  That makes it harder
> to select a net on the schematic and try to then select that rats in a
> pcb layout, plot the simulated voltage on that node, or other things
> of this nature.  This is a failure in the data model used by gschem. 
> Good data model is important.  More so than the file format used to
> represent the data.
>
>
>
> -Dan
>
>
>
>
>
>

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