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[Caml-list] Problems using graphics
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Date: -- (:)
From: Xavier Leroy <xavier.leroy@i...>
Subject: Re: [Caml-list] Problems using graphics
Hi Sébastien,

> I'm writing a small problem using Graphics and encountered the
> following problems :
> 
> - Unix.sleep does not work in conjunction with Graphics. I found the
>   solution in the archive of the Caml List (
>   http://caml.inria.fr/archives/200011/msg00096.html ), but i think
>   this point deserves a note in the documentation or in the FAQ.

Fair enough.  Perhaps a function Unix.really_sleep (that ignores
signals) is in order.

> - The name of a window can be changed only after a window is
>   opened. This is a trouble because some window managers use the name
>   of the window when it opens to decide its position, type of
>   frame... This means it is impossible to differentiate the behavior
>   of two different "Caml Graphics" windows.

Good point.  Should be easy to fix.

> - "fill_rect x y w h" and "draw_rect x y w h" do not draw the same
>   rect. draw_rect is bigger and lower. In my opinion, fill_rect does
>   the right thing. In order to see the problem, try :

Well, Caml calls the X Windows drawing primitives XDrawRectangle and
XFillRectangle with exactly the same arguments.  But that seems to run
into an, hmmm, oddity of X Windows, described in colorful language in
the "Unix Haters" handbook:
  http://www.molgen.mpg.de/~wwwutz/Unix_Haters/x-windows.html
Guess we'll have to work around this one.

- Xavier Leroy
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