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        Mon, 06 Mar 2017 13:08:24 -0800 (PST)
Date: Mon, 6 Mar 2017 22:08:19 +0100
From: "Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] Rubberband move keeping lines direction
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Precedence: bulk

> Actually, I sort of implemented it, but I forgot to add the new files
> to the patch I sent!
> This time, I am attaching the full patch.
> 
> 2017-03-06 21:24 GMT+01:00, Nicklas Karlsson
> (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]
> <geda-user AT delorie DOT com>:
> 
> > I you remember original position line should be elongenated until it hit the
> > moved line. You need to calculate the intersection point, it is a good idea
> > to remember original point during move and if workin 45 or 90 degree angles
> > on a grid rounding errors will probably not be a problem, I think anyway.
> >
> 
> It's good you say that as that's exactly what I did! The movement
> vector goes from line mid point to neighbour lines' intersection. Have
> a look at FitCrosshairIntoGrid( ).
> But actually I am not fitting to the grid, and I gave up on 45/90 grid
> alignments; that's why I moved to floating point, and made it generic
> to any angle, which seems to work fine.
> Anyway, it should be enhanced to grid-align on 45/90 as you say.
> Maybe, if you could try the patch, you could let me know if it works
> as you expect

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.