Re: [gtkmm] Re: How to do call a function once every 'frame'? And some documentation feedback.
- From: Dirk Gerrits <dirk gerrits homeip net>
- To: Bassoukos Tassos <abas aix meng auth gr>, gtkmm-list gnome org
- Subject: Re: [gtkmm] Re: How to do call a function once every 'frame'? And some documentation feedback.
- Date: Sat, 09 Nov 2002 16:54:51 +0100
Bassoukos Tassos wrote:
On Sat, 2002-11-09 at 17:20, Dirk Gerrits wrote:
>But if I understand correctly, with Glib::signal_timeout() the whole
>DoFrame function becomes unnecessary:
>That's just plain cool! :) Thanks.
unfortunately that is not the case! Gtkmm (and most non-Hard-RT
operating systems) only guarantee that the time interval is *at least*
as much as what you specified, never less (e.g. your slot will never
be called earlier, but possibly later).
I do think think this gaurantee should be in the reference docs.
That means that you will need to both calculate how much time has
passed since the last call and to calculate the remaining time after
your computation has finished.
 consider: your computation takes 10 ms, and then you wait for
another 20: sum total 33 ms or 30 frames per second, much less than
20ms or 50 frames per second.
Hmm, I see. Well than I guess I can recycle some of that DoFrame pseudo
code. ;) Too bad the one liner doesn't work, but I do understand why
this would be necessary.
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