Re: How to make a fla****ng light?

Jim <jim@[EMAIL PROTECTED]
> wrote:
> On 2008-04-01, Gregory Weston <uce@[EMAIL PROTECTED]
> wrote:
>>
>>> In my ongoing attempt to learn Cocoa my next wee project is going to
be a
>>> 'is the internet up?' type app. Basically it will send a single ping
packet
>>> to three addresses once every n-seconds (say 120) and *****s the
results.
>>> 
>>> That part isn't a problem.
>>> 
>>> As part of the results I want a graphic of a fla****ng LED. Red for
'Internet
>>> is down', green for 'Internet is up'. My question is this: how do I
make it
>>> flash? The method I'm considering is to have an NSTimer that fires
every 2
>>> seconds and calls a method that toggles the graphic between whatever
two of
>>> the three graphics are appropriate - RedLED on, GreenLED on, LED off.
>>> 
>>> Or is there a better way?
>>
>> That'll work fine.
> 
> Thank you. Good to know that I'm starting to think in the right lines.
> 
> Out of interest - and this is purely a hypothetical question - how would
I
> have two timers, both firing at 2 second inteveals but separeted by a
> second?

You could enable a one second timer from the event handler for your
two second timer. That way you can be sure that an imprecise timer wont
compound a sync problem.

-- 
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