Re: drawables and refresh rates

[Rob Benton <rob benton conwaycorp net>]

Carl Nygard wrote:
> Hooking into the expose_event should work.  Gtk takes care of the double
> buffering itself.  I think it's automatic, but I could be wrong...
>
> Just create the pixmap and draw to it first time through the expose
> callback?  Or some other ugly hack, I don't remember the answer.  Could
> be hook into configure event, or realize event.  There's examples on
> this because allocating colors has the same sort of problem.
>
>
>     // .. create widgets
>
>     _widg->signal_expose_event().
>         connect(SigC::slot(*this, &GtkScreen::_ExposeCB));
>
>      //  initialization
>
>      _widg->queue_draw();

I guess I'm just not following you here.  But that sounds like what I 
tried the first time around:

============================================================================
myclass::drawingarea_realize()
{
	_draw_window = drawarea.get_window();
	_gc = Gdk::GC::create(_draw_window);
	_draw_window->clear();
}

myclass::drawingarea_expose_event(GdkEventExpose * e)
{
	_draw_window->draw_arc(/* blue circle */);
	_draw_window->draw_arc(/* red arc */);
	_draw_window->draw_pixbuf(/* draw svg */);
}
============================================================================

I was trying to use a pixmap in the expose handler to double buffer but 
like I said it needs a drawable for its create method and that drawable 
must be realized.