Re: calling scheme procedures by name from C

[Daniel Kraft <d@domob.eu>]

Linas Vepstas wrote:
>>  -- so does anyone know who wrote it
>> and where/what it is meant to be?
> 
> I don't get what you are saying ...
> at the bottom of your URL it says clearly:
>  "I wrote this page because ... etc
> Copyright (c) 2000 David Drysdale
> Permission is granted to copy, distribute and/or modify ...
> GNU Free Documentation License,

Stupid me, I did miss that...

>> If that's no problem with the original author, I'd volunteer to rework the
>> tutorial for the new Guile API.
> 
> Well, with the GFDL, you don't have to contact the original author.
> You can hack away at it as desired.

You're right of course, I feel silly :$

>> Or maybe write some other tutorial in the
>> same style just with another example (that maybe does not use X functions
>> but something more basic).
> 
> 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).

> 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?

I'm looking forward to trying my hands on this ;)

Yours,
Daniel

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