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    <p><b>I've made you a working example:</b> <a href="http://jsfiddle.net/zbfUq/37/" rel="nofollow">http://jsfiddle.net/zbfUq/37/</a></p> <p>Essentially you have record the mouse position in the <code>onmousemove</code> event handler, but not actually move the line there straight away.</p> <p>You then run a timer which checks every so often (every 10 milliseconds in my example), and moves the line closer to the mouse position.</p> <p>In the <code>onmouseover</code> event, I set the line position to the mouse position, and set the timer going.</p> <p>In the <code>onmouseout</code> event I clear the timer, and set the line position back to 0 (you could also hide the line).</p> <p>The <code>updatepos</code> function first checks how far away the line is from the mouse position. If it is less than 1px away, it simply moves the line to the mouse position. If it is more than 1px away, it moves is closer at a speed proportional to the distance away it is (if the line is further from the mouse, it moves towards it quicker).</p> <p><b>Javascript code</b></p> <pre><code>(function() { var selectline = document.getElementById('selection_line'); var container = document.getElementById('page_content'); var mouseX = 0; var lineX = 0; var linetimer; var updatepos = function () { var speed, distance; distance = Math.abs(mouseX - lineX); if (distance &lt; 1) { lineX = mouseX; } else { speed = Math.round( distance / 10, 0 ); speed = speed &gt;= 1 ? speed : 1; lineX = (lineX &lt; mouseX) ? lineX + speed : lineX - speed; } selectline.style.left = lineX + 'px'; } $(container).on("mouseover", function(e) { lineX = mouseX; selectline.style.left = lineX + 'px'; linetimer = setInterval(updatepos, 10); }); $(container).on('mousemove', function(e) { mouseX = e.pageX; console.log(mouseX); }); $(container).on("mouseout", function(e) { clearTimeout(linetimer); lineX = 0; selectline.style.left = LineX + 'px'; }); })();​ </code></pre>
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    1. POSmooth Javascript mousemove similar to Cubism.js
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    1. COGreat! Thank you so much for this code, very easy to read and understand your thought process. But, do you notice that the line will drop out (and hide) and some points? Mostly when you move too fast. I noticed that if you gradually work up to a fast mouse movement, then this doesn't happen... Any idea why?
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    2. COYes, I actually added this in on purpose as I noticed that the cubism example you linked to exhibited this behaviour. To get rid of simply remove the `distance > 100` part from the `if` in the `updatepos` function (I wasn't really sure whether to include it or not, but I thought I would for completeness) Updated example without the jumpiness here: http://jsfiddle.net/zbfUq/39/
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    3. COThis example is still pretty jumpy for me, not nearly as smooth as the cubism.js example and the line often doesn't end up exactly under the cursor. Is it smooth for others?
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