Re: Dia Automatic Layouting

["Fred Morcos" <fred morcos gmail com>]

On Tue, Aug 5, 2008 at 12:32 AM, Hans Breuer <hans breuer org> wrote:
> Am 04.08.2008 23:05, Fred Morcos schrieb:
> > On Mon, Aug 4, 2008 at 10:19 PM, Hans Breuer <hans breuer org> wrote:
> > > Am 04.08.2008 01:08, Fred Morcos schrieb:
>
> [...]
>
> > > > The other problem is that I can't
> > > > figure out a way for the "Undo" feature to revert "all" of the changes
> > > > made by the algorithm in one step.
> > >
> > > If you have partial undo working maybe there is just an
> > > undo_set_transactionpoint() missing?
> >
> > Well, I tried with undo_move_objects, but I can't really figure out
> > what Point *orig_pos and Point *dest_pos are for. Also,
> > undo_set_transactionpoint(diagram->undo) won't do it either.
> >
> > Basically, what I want to happen when the user chooses to undo, is not
> > to undo each step made by the algorithm, but to undo all what the
> > algorithm changed (to revert back to what the user had before he ran
> > automatic layouting).
> >
> > I guess it would be something like:
> >
> > 1. save current state of diagram into stack
> > 2. make changes to the graph (aka run the algorithm on the graph)
> > 3. save new state of diagram into stack
> Currently I have problems understanding what I see in the video. Is it shows
> just one invocation of the algortihm but visualizing the internal
> iterations?

The videos show multiple invocations of Ctrl+Alt+F but right now (I
changed some stuff) and you only need to press Ctrl+Alt+F once, while
still having the internal iterations visualized (repainted). Due to
some changes I also made, it is pretty quick that it doesn't "animate"
anymore although I am still repainting after every iteration.

> > basically, I guess it would be 1 OR 3 to exist, as other functions
> > will either save the current state and run, or just run based on that
> > the last state was saved from another function, then save the state
> > after running.
> The basic idea - as far as I've understood - is just storing the 'diff' of
> original state and destiantion state. For moving it handle this is just the
> position before the move and afterwards. For your algorithm this could be
> all positions before modification and the final ones.
> This allows not only to undo but also to redo the modification if there was
> undone too much.

You got my point right. But I was actually asking how to achieve that :)

> > > > We can discuss these problems in detail when I send out the patch.
> > > Yes, show us the source ;)
> >
> > I just have some minor things to finish. Actually now it is way way
> > way faster than what is shown in the videos, it now takes less than a
> > breeze ;) to get to the final layout (from the same graph shown in the
> > videos).
> How many invocations are shown in the video? (-:

A couple of hundred I would guess (I just kept Ctrl+Alt+F pressed
down), before the changes I made (mentioned above).

> > One (the only?) thing is that I want to write a small UI with two
> > sliders, one for the distance between "connected/related" objects and
> > one for the spacing between non-connected objects. As these two slides
> > move, the diagram reflects the changes on the fly.
> >
> > I'm pretty familiar with Gtk+, but one question. Where should the UI
> > code go? In commands.c? Or is there another place for that? And what
> > about the callback functions from this UI? should they go into
> > commands.c even if the UI code is elsewhere?
> Please put the new dialog in it's own file, commands.c should only include
> the  bare minimum to map from GtkAction* callback to the Dia functions.
> See the recently added find-and-replace.c if you want an example. (Ooops, no
> traces of that in commands.c at all;))

Will do that.

> Regards,
>        Hans
> -------- Hans "at" Breuer "dot" Org -----------
> Tell me what you need, and I'll tell you how to
> get along without it.                -- Dilbert
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-- 
Fred Morcos
http://fredmorcos.blogspot.com/
http://fredmorcos.googlecode.com/