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POIs there any way to accelerate the mousemove event?
 

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  1. POIs there any way to accelerate the mousemove event?
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    <p>I wrote a little drawing script (canvas) for this website: <a href="http://scri.ch/" rel="noreferrer">http://scri.ch/</a></p> <p>When you click on the document, every <code>mousemove</code> event basically executes the following:<br> - Get coordinates.<br> - <code>context.lineTo()</code> between this point and the previous one<br> - <code>context.stroke()</code> the line</p> <p>As you can see, if you move the cursor very fast, the event isn’t triggering enough (depending on your CPU / Browser / etc.), and a straight line is traced.</p> <p>In pseudocode:</p> <pre><code>window.addEventListener('mousemove', function(e){ myContext.lineTo(e.pageX, e.pageY); myContext.stroke(); }, false); </code></pre> <p>This is a known problem, and the solution is fine, but I would like to optimize that.</p> <p>So instead of <code>stroke()</code> each time a mousemove event is triggered, I put the new coordinates inside an array queue, and regularly draw / empty it with a timer.</p> <p>In pseudocode:</p> <pre><code>var coordsQueue = []; window.addEventListener('mousemove', function(e){ coordsQueue.push([e.pageX, e.pageY]); }, false); function drawLoop(){ window.setTimeout(function(){ var coords; while (coords = coordsQueue.shift()) { myContext.lineTo(coords[0], coords[1]); } myContext.stroke(); drawLoop(); }, 1000); // For testing purposes } </code></pre> <p>But it did not improve the line. So I tried to only draw a point on <code>mousemove</code>. Same result: too much space between the points.</p> <p>It made me realize that the first code block is efficient enough, it is just the <code>mousemove</code> event that is triggering too slowly.</p> <p>So, after having myself spent some time to implement a useless optimization, it’s your turn: is there a way to optimize the <code>mousemove</code> triggering speed in DOM scripting?</p> <p>Is it possible to “request” the mouse position at any time?</p> <p>Thanks for your advices!</p>
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    1. CODuplicate: http://stackoverflow.com/questions/5258424/how-to-set-mousemove-update-speed/
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