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Subject: Re: [geda-user] Differential pair support
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> I'm too tempted to take a look-see at this and fix the straight-line
> issues.

You may want to look at the code in djopt.c, it does the work of
identifying "corners", the intersections of straight lines.  Knowing
the direction of the next line segment will allow you to calculate how
much to change the length of the differential traces.