Converting a constantly changing scalar value to a changing interval or frequency

Posted by eco_bach on Stack Overflow See other posts from Stack Overflow or by eco_bach
Published on 2010-06-11T01:50:33Z Indexed on 2010/06/11 12:42 UTC
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Filed under:

objective-c

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best-practices

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velocity

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scalar

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nstimeinterval

Although I'm coding in Objective C, this is more of a general programming question.
What is the best way to convert a constantly changing scalar value to a changing interval or frequency?

Right now every time the scalar value changes I am destroying the NSInterval
ie

   [self.myTimer invalidate];
    self.myTimer = nil;

and creating a new one, but this seems like a VERY expensive way to achieve my goal, since the changing scalar value in my case represents the horizontal velocity of a swipe.

For a rough analogy, think of the speed of a swipe being reflected in a visual metronome, the faster you swipe, the higher(shorter interval) the frequency of the metronome.

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