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From:	"Luis de Arquer (ldearquer AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date:	Mon, 6 Mar 2017 21:55:10 +0100
Message-ID:	<CAGqyy=ZZB+Q6T0o4x8OP0LB3pBi0XPu3T+mW4-twTEZTxJsvAg@mail.gmail.com>
Subject:	Re: [geda-user] Rubberband move keeping lines direction
To:	geda-user AT delorie DOT com
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--94eb2c1848748050a1054a161cc6
Content-Type: text/plain; charset=UTF-8

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

I am trying to understand better how the Undo thing works, to complete
the implementation.

Luis

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