Re: gEDA-user: wishful UI

[Andrew Poelstra <asp11@xxxxxx>]

On Sat, Aug 07, 2010 at 02:32:33PM +0200, Stefan Salewski wrote:
> 
> These "Maximum Distance between OpAmp and bypass Cap" problem is really
> a special but important case. It is more related to two pads/pins than
> to nets.
>

I agree, but on a high level a net /is/ "a relation between two pads/pins".
(Well, a net can have many pads/pins. A subnet would be restricted to two,
by definition.)

So I don't think we want to introduce a new kind of relationship. It would
be confusing and unnecessary.


>         We can click in gschem on a pair of tow pins to mark this pair
> with the condition "Max Distance = ...". Autoplacer can use this
> information in PCB program. RatsNest lines in PCB can specially mark
> these pin pairs. And after we have routed our board DRC check may verify
> if these maximum distances restrictions are fulfilled.
> 

Again, it looks like storing max distance as a net attribute (or subnet
attribute) would be a cleaner design than trying to fit an attribute onto
"two pads or pins".

> The big problem is again how to transfer netclass information from
> gschem to PCB (and maybe back). I really have no good idea and my Unix
> programming skills are too weak. Saving and loading files is simple, but
> not really nice in my opinion...
> 

Well, the modular design of the gEDA suite dictates that we use simple
files for storing information and sharing them between programs. That
way you can replace any individual program with a better one, in theory
at least.


Andrew



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