[m-rev.] Xlib interface for extras

[Julien Fischer]

On Thu, 23 Sep 2004, Ralph Becket wrote:

> I've been writing a little Xlib based graphics library off and on for a
> couple of months and would like to add it to extras.
>
>From what I 've seen of this that would certainly be worthwhile.

> README:
> xlib.m		A very low-level Mercury wrapper around (parts of) Xlib.
> easyx.m		A nice little graphics library.
> testeasyx.m	A simple demonstration program.
> moveball.m	An orange ball follows the mouse pointer.
> scribble.m	A trivial drawing program.
> bounce.m	A bouncing-ball game.
>
>

Just a few initial comments - I haven't had a chance to look at
it properly yet.

>     % One must open a display in order to create a window.
>     %
> :- type display == xlib.display_ptr.
>
Couldn't this type and several of the others in the interface
of this module be abstract?

Also, there doesn't seem to be any (easy) way of drawing a single
pixel at a particular location - I suggest you add a draw_pixel
predicate.

Cheers,
Julien.
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