Re: gEDA-user: pcb crooked traces

[Andrew Poelstra <asp11@xxxxxx>]

On Mon, Oct 11, 2010 at 11:15:54PM +0200, Stefan Salewski wrote:
> On Mon, 2010-10-11 at 13:57 -0700, Andrew Poelstra wrote:
> 
> >  
> > > What is your conclusion -- if we use 32 bit integer and nm base unit,
> > > will we have maximun board size of 2m or 4m. That was not fully clear in
> > > our discussion two years ago -- it does not really matter, but may be
> > > good to know and to proof our understanding.
> > > 
> > 
> > For the people who need to make giant PCBs on 32-bit systems, we should
> > introduce a scale factor
> 
> My question was related to a post of Peter C.
> 
> >> 2^32 nm is about 4.3 meters, large enough for any PCB I've ever
> >>seen.  
> >> 2^64 nm is about 0.12 astronomical unit ;-)
> 
> >Well.. I can't recall if we use signed or unsigned numbers throughout,
> >so we might end up limited at half those.
> 
> http://archives.seul.org/geda/user/Nov-2008/msg00448.html
> 
> May it be that signed integers are used, but that only the positive half
> can be used for locations? I was only curious.
>

I think we want to allow negative locations. It would be nice to set parts
outside of the pcb boundary, for example when initially placing everything.


Andrew
 


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