StackOverflow2013

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primarykey
Id
10000811
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2012-04-03T20:23:31.267
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2012-04-05T19:36:08.917
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2012-04-05T19:36:08.917
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10000666
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1
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text
Body
Can you post more code than the two lines you've provided? I believe it's something more than where you've set the width/height. I have a drawing application that I've been tinkering with on and off for a while in which I do very much the same thing. The only difference is that I call <code>context.scale(0,0);</code> before setting the width and height. I have no issues in any version of Google Chrome with a blue overlay. Are you possibly modifying the context's scale value before setting the width and height? e.g. here's what I have, setting the canvas to document width/height for a full-document drawing area: <pre><code>context.scale(0,0); context.canvas.width = $(document).width(); context.canvas.height = $(document).height(); </code></pre> edit: my tinkering site mentioned is at <a href="http://drawcomix.com" rel="nofollow">http://drawcomix.com</a> if you want to test the blue overlay to see if it's your browser or your code. edit: based on your additional comment... I've seen tutorials on the web that suggest the best way to clear the canvas is to set the height/width. That's not entirely true. On document load, it may be the quickest/easiest way to do so, but on mouse movements, you're probably better off doing something like this: <pre><code>context.save(); context.setTransform(1,0,0,1,0,0); context.clearRect(0,0,width,height); // width/height of canvas context.restore(); </code></pre> You may not need <code>setTransform</code> if you're not performing any transformations on the canvas. I believe I found this solution in Pro HTML5 Programming (Apress), but I'm not sure.
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1. POGoogle Chrome - context.canvas.width/context.canvas.width causes "Blue layer"
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1. USJim Schubert
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1. USJim Schubert
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1. CONo problem I'll add it in above!
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2. COThanks for this, I'll give it a try!
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