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    <p>This is what I think you should be doing (pseudo-JavaScript):</p> <pre><code>function animate_it($thing) { var wind = false; var timer_id = setInterval(function() { // Compute the movement for this step. // Then factor in the wind effect and update the `wind` variable. // Then apply the movement to `$thing`. if(it_is_off_the_page($thing)) clearInterval(timer_id); }, n); } </code></pre> <p>If there is anything in the inner computation that is computed over and over again, precompute it at the <code>animate_it</code> level and let the closure close over it. You would want to play with it a bit to figure out what <code>n</code> should be.</p> <p>Just do the animation by hand so that you're not fighting with jQuery's <code>animate</code> function and stop the animation when you know it is done. This also allows you to include a direction and strength for the wind (so that your animated object could go backwards) pretty much for free.</p> <p>You might want to get the <code>timer_id</code> back to the outside world so that you could stop the whole thing from the outside. In that case, you'd want to fake a pointer with a one element object:</p> <pre><code>function animate_it($thing) { var wind = false; var pointer = { timer_id: null }; pointer.timer_id = setInterval(function() { // Compute the movement for this step. // Then factor in the wind effect and update the `wind` variable. // Then apply the movement to `$thing`. if(it_is_off_the_page($thing)) { clearInterval(pointer.timer_id); pointer.timer_id = null; } }, n); return pointer; } var timer = animate_it($thing); // And then later, to shut it down... if(timer.timer_id) clearInterval(timer.timer_id); </code></pre> <p>You'd probably want a "it is gone" callback on <code>animate_it</code> if you had a lot of animated objects, that would let you keep your external list of timers clean and cruft free.</p> <hr> <p>The problem with trying to do this with <code>animate</code> is that <code>animate</code> computes the number of steps at the beginning and then you can change that. You need a variable number of steps but <code>animate</code> doesn't care (it cares even less than a honey badger).</p>
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    1. COOk this is a solid idea. I'll try it now and let you know how it goes. As far as pre-calculating the wind, the idea of the wind is to create a randomness. I'm basically animating a butterfly from one side to the other, and if you think about how they fly, it's not like a bird. They speed up, slow down, rise and fall very sporadically despite their best efforts to keep moving forward. The "gusts" of wind every half second or so is what I need to calculate to create that randomness. Gimme a few minutes and I'll post a fiddle.
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    2. CO@AlienWebguy: All I'm trying to say with the "precompute" stuff is do as little as possible in each step; for example, don't do `$(x)` when you can do `var $x = $(x)` before the timer starts. And closing over `wind` allows you to have a persistent value without all the overhead of calling `.data`.
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