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        Mon, 06 Mar 2017 12:24:25 -0800 (PST)
Date: Mon, 6 Mar 2017 21:24:21 +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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> Hi all,
> 
> I have been lately working on my spare time on trying to make the
> "rubberband" move keep track directions, when moving a line attached
> to other two lines, one on each end.

To keep track directions make a lot of sense.

> ...
> 
> - If so, determine how the line and the rubberband lines should move
> to keep their directions. To do this, I had to create fgeometry.c,
> which does floating point geometry.

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.

> ...
> - In the RubberbandType struct, add DX and DY fields, to indicate how
> things have to move when in this mode.
> 
> ... The line (main line being
> moved, not neighbour lines) movement is not a "move line" action
> anymore, but two "move pointline" actions. So it would look weird on
> the Undo history. Would that be OK?
> 
> Hope it makes sense. If anyone could try the patch and give me some
> feedback it would be great!
> 
> Luis
> 
> P.S. Just to clarify, the feature works fine with the "ghost" lines. It is
> the actual movement, when the mouse button is released, that is not
> completed due to the Undo history thing, which I don't know how to
> deal with.


If you have problem with the math to calculate intersection point(s) of lines I might be able to help you?


Regards Nicklas Karlsson