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POHow to center a dynamically sized canvas in a viewport?
 

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  1. POHow to center a dynamically sized canvas in a viewport?
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    <p>I've been struggling with this for some time and I'm hoping you guys can help. I have a dynamically sized canvas that draws a grid based on the canvas size that is refusing to center. I've tried a lot of the suggestions from this site, but they all seem to apply to fixed width canvases. This won't work for me.. </p> <p>Here is all of the code, so you can see everything I'm doing.. I'm using mootools to do the dynamic resize of the canvas and contents. If there's a way to resize without mootools that anyone knows of, that would be great too. </p> <p>Thanks!</p> <p>HTML</p> <pre><code>&lt;!doctype html&gt; &lt;html&gt; &lt;LINK href="style.css" rel="stylesheet" type="text/css"&gt; &lt;head&gt; &lt;meta charset="utf-8"&gt; &lt;script type='text/javascript' src='https://my-youtube.googlecode.com/files/mootools-core-1.4.2-full-nocompat.js'&gt;&lt;/script&gt; &lt;script type='text/javascript' src="chessboard.js"&gt;&lt;/script&gt; &lt;title&gt;Untitled Document&lt;/title&gt; &lt;/head&gt; &lt;body&gt; &lt;div id="header"&gt;&lt;/div&gt; &lt;div id="content"&gt; &lt;canvas id="canvas"&gt;TEST&lt;/canvas&gt; &lt;/div&gt; &lt;div id="footer"&gt;&lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>CSS</p> <pre><code>@charset "utf-8"; /* CSS Document */ #header { margin-top: 0px; height: 75px; width: 100%; background: url(images/logo1.png) no-repeat top center; } #content { width: 100%; height: 100%-75px; } #footer { } body, html { margin-left: auto; margin-right: auto; margin-top: 0; background-color: #a6a6a6; background-image: url(images/background_image3.jpg); background-repeat: repeat-x; height: 100%; } </code></pre> <p>Javascript</p> <pre><code>window.addEvent('load', function() { (function() { var canvas = document.getElementById('canvas'), context = canvas.getContext('2d'); // resize the canvas to fill browser window dynamically window.addEventListener('resize', resizeCanvas, false); function resizeCanvas() { canvas.height = window.innerHeight-100; canvas.width = canvas.height; drawStuff(); } resizeCanvas(); function drawStuff() { var width = canvas.height/8; var baseX = 0.5, baseY = 0.5; // draws the 8 by 8 chessboard for (var i = 0; i &lt; 8; i++) { for (var j = 0; j &lt; 8; j++) { var x = baseX + width * i, y = baseY + width * j; context.strokeRect(x, y, width, width); if ((i + j) % 2 != 0) { context.fillStyle = '#BA1A1A'; context.fillRect(x, y, width, width); } if ((i + j) % 2 == 0) { context.fillStyle = 'E6A3A3'; context.fillRect(x, y, width, width); } } } } })(); }); </code></pre>
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    1. COI got it figured out thanks to the answer in this question: http://stackoverflow.com/questions/283961/centering-a-div-block-without-the-width
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