An OpenSeadragon plugin that adds SVG overlay capability.
Compatible with OpenSeadragon 2.0.0 or greater.
To use, include the openseadragon-svg-overlay.js file after openseadragon.js on your web page.
To add SVG overlay capability to your OpenSeadragon Viewer, call svgOverlay() on it. This will return a new object with the following methods:
node(): Returns the SVG g element that you should add all of your SVG elements to. As the user zooms and pans, the g element will transform to match. Add your elements according to the OpenSeadragon Viewport coordinate system.resize(): If your viewer changes size, you'll need to resize the SVG overlay by calling this method.onClick(node, handler): If you want to accept click events on a sub-node, use this method. It takes care of making sure the click isn't also handled by the Viewer. The handler you provide is called when the click occurs and given a single argument, an OpenSeadragon.MouseTracker click event.See demo.html for an example of it in use. You can see it in action at http://openseadragon.github.io/svg-overlay/demo.html.
This plugin is also used on the desktop version of: