Html5 Canvas DrawImage Stretched - Javascript - Stack Overflow

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Learn more about Labs Html5 canvas drawImage stretched Ask Question Asked 11 years, 6 months ago Modified 11 years, 6 months ago Viewed 18k times 20

I tried to draw image on html5 canvas . The issue is image stretched in canvas

load('img_the_scream', 'http://www.w3schools.com/tags/img_the_scream.jpg', function( img ){ console.log( img.width , img.height ); ctx.drawImage( img, 10, 10 , img.width , img.height ); } );

I added this issue in http://jsfiddle.net/75rAU/

• javascript
• html
• html5-canvas

Share Improve this question Follow asked May 11, 2013 at 17:10 rabrab 4,14411 gold badge3131 silver badges4242 bronze badges Add a comment |

2 Answers 2

Sorted by: Reset to default Highest score (default) Trending (recent votes count more) Date modified (newest first) Date created (oldest first) 44

That is because you modified the canvas size in CSS. The canvas has two separate size : The HTML size (the one you put inside the canvas tag) and the css size, which is actually a rescaling of the canvas. The HTML size is the size you control (when you draw, it uses this size) and the CSS size is the displayed size which is a rescaling of the HTML size.

So here, your canvas has the default size (which I don't remember) but is resized (and stretched) by the css

HTML :

<canvas id="cv" width="350" height="350"></canvas>

CSS :

#cv { background:#ff0; }

Here I updated your fiddle with the correct size assignation

Share Improve this answer Follow answered May 11, 2013 at 17:32 nialna2nialna2 2,18433 gold badges2525 silver badges3333 bronze badges Add a comment | 7

Canvas has it's own sizes. 300x150 at default. Styles (width/height) just stretch canvas like any image. So, you should strongly set sizes to what you want. You may do it through html <canvas width="123" height="123"></canvas> or from JS code canvas.width = canvas.height = 123. Also, here you may set sizes by image properties canvas.width = img.width etc.

So, look at jsfiddle: http://jsfiddle.net/75rAU/3/ It works well

Little upd: http://jsfiddle.net/75rAU/4/ — this may help too

Share Improve this answer Follow answered May 11, 2013 at 17:33 NovelistNovelist 47944 silver badges1515 bronze badges Add a comment |

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