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2013-04-08T14:37:05.447
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<p><strong>Dealing with contents when resizing a canvas</strong></p> <p>If you resize the canvas, the drawn content is always erased. That's how canvas behaves. </p> <p>You can either redraw the content after resizing or you can save the content as image data and restore after resizing (see canvas.toDataURL). </p> <p>Here is code and a Fiddle: <a href="http://jsfiddle.net/m1erickson/V6SVz/" rel="noreferrer">http://jsfiddle.net/m1erickson/V6SVz/</a></p> <pre><code><!doctype html> <html> <head> <link rel="stylesheet" type="text/css" media="all" href="css/reset.css" />  <script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script> <style> body{ background-color: ivory; padding:10px; } canvas{border:1px solid red;} </style> <script> $(function(){ var canvas=document.getElementById("canvas"); var ctx=canvas.getContext("2d"); // draw some content ctx.lineWidth=3; ctx.fillStyle="blue"; ctx.strokeStyle="red"; ctx.rect(50,50,100,50); ctx.fill(); ctx.stroke(); ctx.font="14px Verdana"; ctx.fillStyle="white"; ctx.fillText("Scale Me",65,75); function saveResizeAndRedisplay(scaleFactor){ // save the canvas content as imageURL var data=canvas.toDataURL(); // resize the canvas canvas.width*=scaleFactor; canvas.height*=scaleFactor; // scale and redraw the canvas content var img=new Image(); img.onload=function(){ ctx.drawImage(img,0,0,img.width,img.height,0,0,canvas.width,canvas.height); } img.src=data; } $("#resizer").click(function(){ saveResizeAndRedisplay(1.5); }); }); // end $(function(){}); </script> </head> <body> <button id="resizer">Click to resize the canvas</button><br/> <canvas id="canvas" width=200 height=150></canvas> </body> </html> </code></pre>
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1. POHTML5 responsive canvas: resizing the browser canvas draw disappear
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