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POJavascript iPhone Scroll Effect in an iFrame / Javascript Mouse Acceleration
 

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  1. POJavascript iPhone Scroll Effect in an iFrame / Javascript Mouse Acceleration
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    <p>I'm trying to recreate the iPhone flick / scroll event in a window using JavaScript.</p> <p>Starting with JQuery, I'm measuring the mouse's acceleration and offset during click - drag - release events using a timer:</p> <pre><code>var MouseY = { init: function(context) { var self = this; self._context = context || window self._down = false; self._now = 0; self._last = 0; self._offset = 0; self._timer = 0; self._acceleration = 0; $(self._context).mousedown(function() {self._down = true;}); $(self._context).mouseup(function() {self._down = false;}); $(self._context).mousemove(function(e) {self.move(e);}); }, move: function(e) { var self = this; self._timer++; self._last = self._now; self._now = e.clientY + window.document.body.scrollTop; self._offset = self._now - self._last; self._acceleration = self._offset / self._timer; }, reset: function() { this._offset = 0; this._acceleration = 0; this._timer = 0; } }; $(function() { MouseY.init(); setInterval(function() { $('#info').html( '_acceleration:' + MouseY._acceleration + '&lt;br /&gt;' + '_now:' + MouseY._now + '&lt;br /&gt;' + '_offset:' + MouseY._offset + '&lt;br /&gt;' + '_timer:' + MouseY._timer + '&lt;br /&gt;' ); MouseY.reset(); }, 10); }); </code></pre> <p>Now the problem is translating that acceleration into screen movement - are there any algorithms (easing?) or animation libraries that could help me out on this? (I've looked into JQuery's .animate() but I'm unsure of how to apply it continuously during the drag events!</p> <p><strong>Update - final solution here:</strong></p> <p><a href="http://johnboxall.github.com/iphone.html" rel="noreferrer">http://johnboxall.github.com/iphone.html</a></p>
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    1. COWith the help of the answer I've more or less solved this one: http://johnboxall.github.com/iphone.html
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