Graphics library

Graphics library

[Marc Tajchman]

Hi,

I have two suggestions concerning the graphics library in
ocaml-2.0.2.

It's simple and works well but it seems not possible to
use this package to

 1. open several X11 windows
 2. draw "off-line" (double buffering)

I need the second point to eliminate "flickering" (smooth 
re-drawing of successive intermediate results in a fluid
simulation).

Hope I didn't miss something in the docs.

Thanks in advance for comments.
 
_______________________________________________________________________
Marc Tajchman,           tel.   : (0 / 33) 1 47 40 59 45
                         e-mail : Marc.Tajchman@cmla.ens-cachan.fr
                         fax    : (0 / 33) 1 47 40 59 01

Centre de Mathématiques et de Leurs Applications, 
École Normale Supérieure de Cachan,
61, avenue du Président Wilson,
94235 Cachan Cedex - France.

Re: Graphics library

[Sven LUTHER]

On Fri, Apr 23, 1999 at 03:03:09AM +0200, Marc Tajchman wrote:
> Hi,
> 
> I have two suggestions concerning the graphics library in
> ocaml-2.0.2.
> 
> It's simple and works well but it seems not possible to
> use this package to
> 
>  1. open several X11 windows
>  2. draw "off-line" (double buffering)
> 
> I need the second point to eliminate "flickering" (smooth 
> re-drawing of successive intermediate results in a fluid
> simulation).
> 
> Hope I didn't miss something in the docs.
> 
> Thanks in advance for comments.

Ihave been working on mlgtk, the gtk bindings to ocaml, and have been using it
for my own graphical user interface.

I was working on a project to provide a Graphics compatible module for mlgtk,
but laked the time to continue working on it.

If you like, you could look at the third tutorial of the mlgtk package
(examples/tut_3.ml or something like that) which basically opens a window
where you can click to draw small rectangles (it basically is the same as the
gtk example doing the same stuff.).

Hope this help, and if you have any further questions i would be glade to
respond on it.

(there is also a mlgtk mailing list at to subscribe send SUB <first name> <last
 name> to mlgtk@u-strasbg.fr)

mlgtk can be obtained from :

http://pauillac.inria.fr/~cuoq


Friendly,

Sven LUTHER

Re: Graphics library

[Fabrice Le Fessant]

There is an implementation of the Graphics library of Ocaml in the
Efuns package (http://pauillac.inria.fr/efuns) which provides almost 
the same interface, with some more functions, such as double
buffering:

open XGraphics;;                                 (* instead of Graphics *)
open_graph "" 600 400;;             (* instead of open_graph " 600x400" *)
set_update_stype FlushAll;; 
                    (* for double-buffering, or FlushClipped for
                                           faster but not total refresh *)
.........
.........
.........                                        (* Idem as in Graphics *)
.........

update ();; 
           (* when you want to update the screen from the hidden buffer *)


Regards,

- Fabrice

Re: Graphics library

[Sven LUTHER]

On Fri, Apr 23, 1999 at 03:03:09AM +0200, Marc Tajchman wrote:
> Hi,
> 
> I have two suggestions concerning the graphics library in
> ocaml-2.0.2.
> 
> It's simple and works well but it seems not possible to
> use this package to
> 
>  1. open several X11 windows
>  2. draw "off-line" (double buffering)
> 
> I need the second point to eliminate "flickering" (smooth 
> re-drawing of successive intermediate results in a fluid
> simulation).
> 

The next version of the mlgtk library (gtk+ bindings for ocaml) will contain a
gtkDrawing module, that beside providing a Graphics compatibility module,
provides a way of defining GtkDrawingarea widgets with backing pixmap, that you
can act upon in a Graphics like manner (but providing the gtkdrawingarea widget
as parameter.)

It is not yet complete, but already functional for drawing stuff. Mlgtk is
found at :

http://cristal.inria.fr/~cuoq/mlgtk.html

but it don't yet contain this, write to me and i can get you a current snapshot
of it.

Friendly,

Sven LUTHER