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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 22:14:52 +0100
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Subject: Re: [geda-user] Rubberband move keeping lines direction
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Oh, all my code GPLv2 or later
I'll put the notice on the new files

2017-03-06 21:55 GMT+01:00, Luis de Arquer <ldearquer AT gmail DOT com>:
> 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
>