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Re: Milliseconds



Laurence Harris wrote: 

On Jan 14, 2007, at 6:14 PM, Daniel Shiffman wrote:

Hello!

New to this list.  I'm in the process of porting several PC
application to Mac (Carbon / C++ / OpenGL).  The one last piece I
can't seem to solve is how to retrieve the milliseconds() from the
system clock.  I have an animation that needs to enforce a certain
framerate.  I'm using usleep() to wait between frames, but I need the
milliseconds to determine how long to wait!

Any help would be greatly appreciated.

FWIW, this isn't how Carbon applications generally control animation. They use Carbon event timers set to fire at specific intervals instead.
If you want a consistent framerate, relying solely on Carbon event timers isn't recommended. They might drift or miss a firing interval. If consistency is important, you could use a high-frequency Carbon event timer coupled with the Microseconds call to check the actual elapsed time. (e.g. fire the timer 120 times a second, animate at 30fps.)

If consistency isn't very important, Carbon event timers are probably good enough. They aren't perfect but they do OK.
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 >Milliseconds (From: "Daniel Shiffman" <email@hidden>)
 >Re: Milliseconds (From: Laurence Harris <email@hidden>)



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