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Date: Sat, 11 Mar 2017 18:21:28 +0100
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] Rubberband move keeping lines direction
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> > If it work for any angle just a little bit of grid snapping to compensate
> > for rounding errors should solve it for the special but very common case of
> > 45/90 angles.
> >
> 
> I thought about rounding errors too, but in the end, floating point
> (double really) works pretty well, so 45/90 tracks keep their
> orientation perfectly, to the 100th of mil (i.e, same dx and dy module
> for 45deg tracks).

Yes, accuracy of calculation is so high it make no practical difference unless moved really many times.

> The problem was that, snapping to grid for any
> angle is perhaps impossible ...

In sort of it is because a double might not hit the exact number in the grid. To be perfect they should snap to the same or closest number but in practice it might not make a difference.

I think it is great even without this small tiny detail.