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    <p>You can do it more easily with css3 transitions.<br> Exemple: <a href="http://jsfiddle.net/BaliBalo/xn75a/" rel="nofollow">http://jsfiddle.net/BaliBalo/xn75a/</a><br> The main center-mouse algorithm is here:</p> <pre><code>//Center the image if it's smaller than the container if(scale &lt;= 1) { currentLocation.x = im.width() / 2; currentLocation.y = im.height() / 2; } else { currentLocation.x += moveSmooth * (mouseLocation.x - currentLocation.x) / currentScale; currentLocation.y += moveSmooth * (mouseLocation.y - currentLocation.y) / currentScale; } </code></pre> <p>If you want to keep your already-existing code, I think you can do it approximatively the same: the trick to get the mouse position on the zoomed image when the image itself is zoomed by a css scale transform and using transform-origin is to substract the transform origin to your point then multiply by the factor and finally re-add the transform-origin.</p> <p>You can also use translate as in this updated example: <a href="http://jsfiddle.net/BaliBalo/xn75a/15/" rel="nofollow">http://jsfiddle.net/BaliBalo/xn75a/15/</a> As you can see it even simplifies the formulas but don't forget to sub the center of the element to mouse point as a translation of {0, 0} will zoom on the middle of the image.</p> <hr> <h2>EDIT:</h2> <p>I stumbled on this answer of mine today and figured it wasn't really the behaviour you wanted. I didn't understand correctly the first time that you didn't want to center the point under the mouse but to keep it in the same spot. As I did it recently for a personnal project I tried to correct myself. So here is a more accurate answer :<br> <a href="http://jsfiddle.net/BaliBalo/7ozrc1cq/" rel="nofollow">http://jsfiddle.net/BaliBalo/7ozrc1cq/</a></p> <p>The main part is now (if currentLocation is the top-left point of the image in the container) :</p> <pre><code>var factor = 1 - newScale / currentScale; currentLocation.x += (mouseLocation.x - currentLocation.x) * factor; currentLocation.y += (mouseLocation.y - currentLocation.y) * factor; </code></pre> <p>I also removed the CSS transition. I think the best way to achieve a smooth scrolling would be to use <code>requestAnimationFrame</code> to create an animation loop and instead of changing values directly in the <code>zoom</code> function, store values and animate towards them in the loop.</p>
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    1. POHow to zoom to mouse pointer while using my own mousewheel smoothscroll?
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    1. COAlthough the behaviour in your jSFiddles is not exactly what I am after it's definately a step in the right direction and should be e enought to get me where I want. Thanks for the great answer :)
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