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Date:	Fri, 13 May 2016 10:47:59 +0100
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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To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] Differential pair support
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On 13/05/16 05:58, Stephen Ecob (stephen DOT ecob AT sioi DOT com DOT au) [via
geda-user AT delorie DOT com] wrote:
> Here's a basic implementation of differential pair support.
>
> The code in "differential.c" needs to be placed inside action.c
>
> The code is run by typing
>
> :MakeDifferential(TargetWidth,gap)
>
> where TargetWidth is the width of lines to transform and gap is the
> thickness of the gap to insert.
>
> The pictures show a 19 mil trace that is transformed into a
> differential pair with thickness 7 mil and gap 5 mil.  This was done
> by typing
>
> :MakeDifferential(19mil,5mil)
>
> Caveats:
>
> * Doesn't support undo properly. Back up your work before running.
>
> * Doesn't work well with straight line intersections, it creates gaps
> and overhangs at the intersections. The workaround is to use arcs for
> changing direction, as it handles line to arc intersections
> beautifully.
>
> Enjoy!
I'm too tempted to take a look-see at this and fix the straight-line
issues. When you mentioned it, I knew exactly what the problem was
likely to be (I've moved enough tracks around manually to see the
scenario!!) and I think whilst arcs is a convenient temporary solution,
it may prove awkward on highly dense boards! If anyone else nails it
before me, please let me know!
=46rom a random user, thanks for your contribution!

Michael.


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