Forked version

Adding a start and end function to adjust the interface after zoom has been performed

Zoom it!

Allows your users to zoom, rotate, and pan images using touch gestures.

For a DEMO open this on mobile: http://anitasv.github.io/zoom/

Type	Link	Size
Minified	http://anitasv.github.io/zoom/zoom-1.0.7.min.js	2184 bytes (gzip: 1024 bytes)
Debugging	http://anitasv.github.io/zoom/zoom-1.0.7.js	10815 bytes
NPM	https://www.npmjs.com/package/zoom-it

For an explanation of math see https://github.com/anitasv/zoom/wiki/Explaining-Math

Send pull requests, bug reports, and feature requests to https://github.com/anitasv/zoom/

Usage

<div width=320 height=240 style="overflow:hidden;">
    <!-- this doesn't have to be an image -->
    <img id="torotate" width=320 height=240 src="https://lh3.googleusercontent.com/w33i78Rt0j4GHr7SA1luYtBAtmC1DmRHwobUcK1wCKivA_u4VczsDw0CweLmJpUwFRUs=w1920-h1200-no">
</div>

<script type="text/javascript" src="http://anitasv.github.io/zoom/zoom-1.0.7.min.js"> </script>

The overflow:hidden is to crop the image moving outside the original border. Be creative. Hotlinking to github.io may get you blocked; so copy to your own location.

var elem = document.getElementById('torotate');
var zm = new Zoom(elem, {
    rotate: true
});

Pan cannot be currently disabled, there is an outstanding issue on it.

You can do operations like zm.reset() on this object, by default it attaches listeners to the object given.

If you are using NPM, then

var zoom = require("zoom-it");
var wnd = window; // Get this.

var elem = document.getElementById('torotate');
var zm = new zoom.Zoom(elem, {
    rotate: true
}, wnd);