Re: drawing graphics

[Olexiy Avramchenko <ath beast stu cn ua>]

CAVEY GERARD wrote:

> Hello
> My app uses a GtkDrawingArea to display some data (lines & texts)  drawn
> with gdk drawing primitives.
> the main drawing function is linked with the expose_event of my drawing area
>
>  gtk_signal_connect (GTK_OBJECT (drawingarea1), "expose_event",
>  		GTK_SIGNAL_FUNC(DrawData),this);
>
> thus my system is not very effective and my function is called for each
> refresh request...
> what would be the most effective solution ?
> or where could i put the draw code so that it could be called only once ?
> maybe i should use something else rather than drawing area???
> (btw: my drawing function reads a hard drive file that s why i would avoid
> to call it so much)
Hmm, in that case you have to use back buffer (usual GdkPixmap). You 
have to paint all
graphics to that pixmap and draw pixmap on expose event. Look at 
scribble-simple example,
coming with gtk.

Olexiy