Re: calling scheme procedures by name from C

[Linas Vepstas <linasvepstas@gmail.com>]

2009/8/2 Daniel Kraft <d@domob.eu>:

>> Yeah, X examples are rather anachronistic.  I dunno, an OpenGL
>> version might be fun.  Imagine .. 3D programming in scheme ..!
>> it would not be a bad idea, I don't think.
>
> Hm... Maybe allowing to build a simple 3D scene, like:
>
> (define x (make-scene))
> (add-sphere x '(1 2 3) 5 'red)
> ...
>
> But I fear this makes the backend code a lot more complicated than is good
> for this purpose; and the OpenGL code probably gets also lengthier than the
> X one (though I'm not an expert with OpenGL).

There are some very easy-to-use windowing toolkits intended for
OpenGL e.g. glut. But, yes, simply setting up lights, setting up
viewpoint, declaring basic surface properties would be verbose.

>> Anyway, doing something interactive would be appropriate --
>> something vaguely enjoyable when its done.  Maybe a simple
>> fractal explorer?
>
> Fractal Explorer sounds nice, and I'd use Gtk+ as "graphics library" for it.
>  On the other hand, I also quite like keeping the original "logo" package;
> with the interactive fractal explorer, I don't see much one could do with it
> apart from zooming/moving with Scheme commands.  For the logo package, one
> can, for instance, quite elegantly construct a Koch curve with a recursive
> Scheme function -- I don't know if the existing tutorial does this, but I
> quite like this idea and it would give a "nice" example where scripting with
> Guile is really useful and produces a cool result.
>
> So I favour keeping it but maybe really switching the backend to Gtk+ from
> X.  Or do you have some other ideas for a good example project?

Sounds good to me. Whatever excites you the most is what counts!

--linas