Re: how to make an animation ;)

[tomas tuxteam de]

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On Fri, Feb 09, 2007 at 01:02:20AM +0100, Olivier Ramare wrote:
> Enrico Sardi wrote:
> > Hi all!
> >
> > I want to make a simple animation in gtk with a pixbuf that rotates, how 
> > can I make it?
> >   
> For every change of state of my application, the image changes.
> I have 10 files with the rotated images (I've created them with
> a repeated use of gimp) and I use the following code:
> ----------------------------------------------------------------------------------------------------------------------
> #define GTK_FLUSH while (gtk_events_pending()) gtk_main_iteration();
> void wait_fine(float intervalle)
> {
>     float lheure = (clock()/CLOCKS_PER_SEC);
>     while(((clock()/CLOCKS_PER_SEC) - lheure) < intervalle){;};
> }

The problem with this is that it'll keep your program (and most of your
computer ;) busy with the job. Better use a timer (or an idle) callback.

Even better: pixbufs know about animations and do it for you! With
gdk_pixbuf_animation_new_from_file()[1] you can load an animation from a
file (there are other functions aroud there if you want to build-up the
anim frame-by-frame). You can put this animated pixbuf in a GtkImage the
usual way with gtk_image_set_from_pixbuf()[2]

I'm too bogged down to cook up an example right now, but this might
help.

- ------------------------------------
[1] 
http://developer.gnome.org/doc/API/2.0/gdk-pixbuf/gdk-pixbuf-animation.html#gdk-pixbuf-animation-new-from-file
[2] http://developer.gnome.org/doc/API/2.0/gtk/GtkImage.html#gtk-image-set-from-pixbuf

Regards
- -- tomÃs
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