Re: Newbie pleading for help...

[Hilaire Fernandes]

Alex,

Not sure this can help but I have just release DrGenius 0.6.0 which is
an interactive geometry software (Gnome/GTK+ based) where guile script
can be dropped in the figure. Basicly an user decides to create a script
on a figure then input the guile code in a dialog. The code is then
evaluated using gh_eval_str when update is needed.
You can check at http://www.ofset.org/drgenius

Hilaire


On Wed, 2002-02-20 at 18:20, Alex Kim wrote:
> Hello,
> 
> Thank you very much for your reply.  If you wouldn't
> mind, I would like to ask you some more questions.
> 
> Guile ref. manual says that "An application can use
> Guile as an extension language..." and this is exactly
> what I want to do.  I am writing a simple image
> processing toolkit with GUI in c. The GUI displays an
> image and waits for input.  The input is an array of
> points and the GUI draws lines connecting the points
> on top of the image.  The input, ie, the array of
> points, can be generated using various algorithms and
> this is where I am trying to use GUILE as an extension
> language: the toolkit provides to GUILE one simple
> function that draws a line given two points; the
> various algorithms are implemented in GUILE calling
> the line drawing function to display their results.
> This way, I can easily add new algorithms to the
> toolkit without touching any other parts of the code.
> And I got it work this far following mainly the
> tortoise example written by David Drysdale.
> 
> Then, I wanted to add event processing loop for the
> GUI itself to respond to the mouse interaction so
> that I can interactively modify the lines as needed.
> As I described in the previous message, this
> turned out to be very hard for me to achieve since two
> event loops that never return are required (one for
> gh_repl and the other for GUI).  After many days
> of struggling with pthread, I learned from the list's
> archive that pthread can't solve the problem and also
> learned that guile and gtk may give me the solution.
> So, I am looking for some example codes or any
> pointers that can help me solve my problem.  Simply
> put, I am looking for something that works just like
> the tortoise example (found on GUILE tutorial at
> http://www.gnu.org/software/guile/docs/docs.html),
> but with added event handling ability for mouse
> interaction with GUI.
> 
> I hope I described my problem a bit clearer this time.
> Do you think what I am trying to do can be achievable?
> Again, I sincerely appreciate your reply and any
> further advice/helps.
> Thank you very much.
> 
> Sincerely,
> ---
> 
> Alex Kim
> 
> 
> 
> 
> 
> --- Bo Forslund <address@hidden> wrote:
> > Hello!
> > 
> > 
> > I'm afraid I can't say that I understand what You
> > are asking, but I shall try to give an answer.
> > 
> > I think I understand that You want a graphic
> > interface to scheme. You can have the interface
> > written entirely in scheme using guile-gtk, or in
> > C and use guile-gtk  glue functions to to call
> > scheme functions.
> > I managed to get a deck of cards written in scheme
> > into a gtk interface some while ago. I also managed
> > to do a little prog with the Glade GUI builder that
> > called a scheme function.
> > Unfortunate it got lost when I had a a crach and had
> > to reinstall Linux from scratch. It was 4 - 5
> > months ago so I don't remember very well what I did
> > either.
> > 
> > I started out by reading the examples in guile-gtk
> > (guile-1.5.4 and guile-gtk-0.21pre4). It was
> > difficult to get them compile due to some errors in
> > the Makefile.am.
> > 
> > I also read this pages I found on web.
> > 
> > 
> > http://www.lilypond.org/wiki/?Guile
> >
> http://www.nada.kth.se/~mdj/guile-ref/guile-ref_toc.html#TOC10
> > 
> > 
> > 
> > I hope that tihs is to any help
> > Bo Forslund
> > 
> > 
> > Alex Kim wrote:
> > 
> > > Dear guile (and guile-gtk) experts,
> > >
> > > I understand that my question may irritate some of
> > > you since it has been discussed here before.
> > > Nevertheless, I am asking the question with 
> > > desperation and as a last resort.
> > > Many apologies.
> > >
> > > I was given a task a couple of months ago.  After
> > > a long serious thinking, I came up with an idea
> > > which made use of a lot of stack and list 
> > > operations (which scheme is good at) and wanted to
> > > verify my idea as quickly as possible. Fortunately
> > > (or unfortunately, I can't say for sure yet),
> > > I know just enough scheme to write moderate size
> > > programs. So, I started coding in scheme.
> > >
> > > My intension was to implement the idea in guile
> > > scheme and the GUI in c with X or gtk providing
> > > one simple line drawing function for guile to call
> > > so that I can draw lines as they are computed from
> > > scheme code (similar to tortoise example). And it
> > > worked great.
> > >
> > > Then, I wanted to add event processing to the GUI
> > > and this is where I got stuck---it also required
> > > its own event loop in addition to gh_repl. At
> first,
> > > I naively thought I could resolve the problem
> > > using pthread, which didn't work.  With pitiful
> > > and (of course) unsuccessful debugging of many
> > > days, I looked up the list's archive and found out
> > > that the question has been discussed previously
> > > and someone successfully  solved the problem using
> > > event-repl stuff coming with guile-gtk.
> > > Nevertheless, with my short knowledge of guile,
> > > the discussions were hard to follow and I ended
> > > up with a conclusion of rewriting the whole thing
> > > in c.
> > >
> > > However, I still desperately want to stay with
> >
> > > scheme since it will make further improvement of
> > > my idea extremely easier.  So, before I begin to
> > > rewriting, I thought I might ask you, the guile
> > > experts, for help as a last resort.  Would anyone
> > > out there generously provide me some pointers or
> > > simple example codes that work just like tortoise
> > > example, but with added event handling ability 
> > > (either X or gtk)?  I would be very grateful to
> > >  you.
> > >
> > > Please accept my sincere apology if you got upset
> > > by my posting of what has been discussed before.
> > > Thank you very much.
> > >
> > > Sincerely,
> 
> 
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