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Subject:	Re: [geda-user] Differential pair support
From:	"Stephen Ecob (stephen DOT ecob AT sioi DOT com DOT au) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	geda-user AT delorie DOT com
Reply-To:	geda-user AT delorie DOT com

--94eb2c034488f3665d0532b21e7d
Content-Type: text/plain; charset=UTF-8

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!

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