Re: capturing user reaction times in msecs
Re: capturing user reaction times in msecs
- Subject: Re: capturing user reaction times in msecs
- From: julia Cline <email@hidden>
- Date: Tue, 19 Dec 2006 08:36:18 -0800
For my purposes, I think that close enough is good enough--especially if the error margin is constant. (That is, if every time the display becomes visible the system takes the same amount of time to get it onscreen). I'm asking a much, much lower level question. What code do I use? I am unable to find a simple function or Class that returns the time to the msec. For example, I can find a "possible token in the Calendar Format String" that will specify msecs (%F), but I have no idea how to use it.
On Dec 19, 2006, at 8:07 AM, Scott Ribe wrote:
It's rather hard to know to ms precision when the display change actually
becomes visible. Everything is double-buffered and the system generally
updates the display on its own notion of when it "should", and of course in
the worst case some displays (60Hz interlaced) may take as much as ~30ms to
complete display of the new image.
I don't know if there's a way to find out accurately when the updated
display is actually flushed to the device. I've asked this question myself
before, and got no answer.
--
Scott Ribe
email@hidden
http://www.killerbytes.com/
(303) 722-0567 voice
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