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    <p>I managed to get it working. </p> <p><a href="https://jsfiddle.net/NKyTZ/553/" rel="nofollow noreferrer">jsFiddle demo</a></p> <p>In the jsFiddle demo, clicking on the image represents a pinch gesture centred at the click point. Subsequent clicks increase the scale factor by a constant amount. To make this useful, you would want to make the scale and translate computations much more often on a transform event (hammer.js provides one).</p> <p>The key to getting it to work was to correctly compute the point of scale coordinates relative to the image. I used <code>event.clientX/Y</code> to get the screen coordinates. The following lines convert from screen to image coordinates:</p> <pre><code>x -= offset.left + newX y -= offset.top + newY </code></pre> <p>Then we compute a new size for the image and find the distances to translate by. The translation equation is taken from <a href="http://www.yuiblog.com/blog/2012/02/23/video-stephen-woods-html5-touch" rel="nofollow noreferrer">Stephen Woods' talk</a>.</p> <pre><code>newWidth = image.width() * scale newHeight = image.height() * scale newX += -x * (newWidth - image.width) / newWidth newY += -y * (newHeight - image.height) / newHeight </code></pre> <p>Finally, we scale and translate</p> <pre><code>image.css '-webkit-transform', "scale3d(#{scale}, #{scale}, 1)" wrap.css '-webkit-transform', "translate3d(#{newX}px, #{newY}px, 0)" </code></pre> <p>We do all our translations on a wrapper element to ensure that the translate-origin stays at the top left of our image.</p>
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    1. USMaros Hluska
    1. USMaros Hluska
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    1. COthats my cat! !!??
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      1. USScott Evernden
    2. CO2nd link is broken.
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      1. USKazekage Gaara
    3. COThere is really good point from Stephen Woods: Do absolute nothing else in code while transforming with css (not loading stuff etc). Helped a lot in my own project.
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