On Sun, 13 Nov 2005 14:47:23 -0000
"Chuck" <[EMAIL PROTECTED]> wrote:
> In my application I will need to implement blinking effects for various
> symbols. For example, a symbol may represent a smoke detector and this
> symbol would blink when in alarm and not acknowledged.
>
> Since several symbols may require a blinking effect at the same time,
> the blinking should be synchrounous so as to avoid driving the user
> crazy.
>
>
> What are some good ways to achieve this? I was thinking of two methods.
> One method would be to implement this entirely in java script by
> creating a "blink list". Symbols would be added and subtracted from the
> list as necessary. Anytime the list is not empty a javascript timer
> loop would run at 0.5 second interval alternately hiding and unhiding
> the population of symbols. The other method would be to dynamically
> create and delete animations for each symbol that needs to blink. This
> second method seems powerful (as it would let me implement more complex
> blinking such as fade-in fade-out) but I am not sure how to synchronize.
>
> How have the masses tackled this problem? What are the performance
> implecations for each approach considering it is possible to have
> hundreds of symbols blinking on a single display?
I've used this approach from Java before and it worked quite well. I've never
done it from JavaScript. Two items that made my work easier, I used a cycle
of 1 second on and one second off. Also, instead of hiding the 'alarmed'
items I changed the opacity. Setting the opacity to 0.5 and then back to 1.0
(or removing it) gave a nice flashing effect.
G. Wade
--
Results are what you wanted, consequences are what you got.
-- Michael VanDusen
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