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Date:	Fri, 13 May 2016 10:15:22 +0200
From:	"Gabriel Paubert (paubert AT iram DOT es) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	"Stephen Ecob (stephen DOT ecob AT sioi DOT com DOT au) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject:	Re: [geda-user] Differential pair support
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On Fri, May 13, 2016 at 02:58:08PM +1000, 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.

I've done quite a few differential pairs lately, and this looks like a
nice addition (although I'm always in metric). Is there somewhere a tool
that can be used to replace angles by arcs (when the angle is not 90°)?

If it exists I missed it.

> 
> Enjoy!

    Thanks,
    Gabriel

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