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2013-08-02T17:05:22.180
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2013-08-02T17:20:16.083
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<p>If you do want to keep using patterns, you need to switch to using <code>fillRect</code> instead of creating a rectangle and using <code>fill</code>:</p> <pre><code>drawItem = function(item) { var imageObj = new Image(); imageObj.onload = function() { var pattern = context.createPattern(imageObj, 'repeat'); context.fillStyle = pattern; context.fillRect(gridSize*item.position[0], gridSize*item.position[1], gridSize, gridSize); }; imageObj.src = item.img; }; </code></pre> <h2><a href="http://jsfiddle.net/rSVkb/3/" rel="nofollow">See it in action</a></h2> <p><code>.fill</code> was applying the current pattern on the entire context that had been filled already. Continuing to use pattern would allow you to draw multiple in a row doing something like:</p> <pre><code>itemOne = { img : 'https://lh3.googleusercontent.com/ZX4Zl7JT1gkgOVA9FbMFnMAw7TC9bBCVMSGWKFTmOW88vDTgcCOb7tBBo60nxoSdHQ=s190', position : [0, 0], //these get multiplied with "gridSize" in the drawItem-function howManyX: 2, howManyY: 1 }; // And then in drawImage context.fillRect(gridSize*item.position[0], gridSize*item.position[1], gridSize*(item.howManyX || 1), gridSize*(item.howManyY || 1)); </code></pre> <p>And using those as modifiers for the last 2 arguments in <code>fillRect</code>.</p> <p>Or lets you do multiple <code>positions</code> on your items like <a href="http://jsfiddle.net/rSVkb/4/" rel="nofollow">this</a>. You could do that with <code>.drawImage</code> as well, but the pattern only needs to be made once. And this <a href="http://jsperf.com/drawimage-vs-canvaspattern/7" rel="nofollow">jsperf</a> shows that using a pattern can be much faster.</p>
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1. POCanvas, Rect: Images for patterns are displayed wrong
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1. COAh now I'm getting it. Many thanks to you as well!
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