Re: gEDA-user: pcb crooked traces

[Andrew Poelstra <asp11@xxxxxx>]

On Fri, Oct 08, 2010 at 10:31:10AM -0400, Rick Collins wrote:
> At 10:01 AM 10/8/2010, you wrote:
> >
> >Not quite. The ``internal resolution'' would be the same, but the
> >visible units (on the gui and in the exports) would be scaled by
> >the scale factor, on a per-.pcb basis.
> 
> If I understand correctly, this would not solve the problem.  The
> problem results from working with data in metric format which can
> not be represented exactly using an inch based internal integer.  If
> the internal representation is metric, then inches can be
> represented exactly.
>
> Are you suggesting that 32 bit integers representing nm could be
> used and the 2/4 meter limitation could be resolved by using a scale
> factor?
>

Yes. Set the scale-factor to 1000, and now your "base-unit" is um,
in that the smallest PCB object you can make will be scaled to a
micrometer, and you can have 2km boards if you want.
 
> Am I up to speed now?
> 
> Personally, I can't imagine a PCB larger than 2 meters much less 4
> meters.  Or is the possibility of uses other than PCB design being
> considered here?
>

Andrew

 


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