A little plugin for the Raphaël Javascript SVG library enabling canvas-wide zoom, pan and drag functionality.
Instantiate a RaphaelZPD object by passing it the Raphael paper context in which to operate, and an object expressing the desired options:
var zpd = new RaphaelZPD(paper, { zoom: true, pan: true, drag: true });
The options object can be accessed following initialisation as zpd.opts. You may disable the drag functionality on the basis of individual Raphaël elements like so:
el.node.draggable = false;
The coordinates given by mouse events are still relative to the SVG canvas itself. The plugin works around this by adding zoomedX and zoomedY properties to all such events, which are correctly transformed.
The ZPD function works by creating an SVG group element (with id 'viewport' + n) and overriding the constructors on the default Raphäel elements to place them within. Clearly, this technique won't work with VML. If you want to use the plugin with a browser that does not natively support SVG, it is suggested that you investigate svgweb.
Treeblob is a contrived example of network visualisation using the panning and zooming functionalities.
Based on the SVGPan library created by Andrea Leofreddi.
Copyright 2010 Daniel Assange <somnidea@lemma.org> (Raphaël integration and extensions). All rights reserved.
Copyright 2009-2010 Andrea Leofreddi <a.leofreddi@itcharm.com> (original author). All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of
conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list
of conditions and the following disclaimer in the documentation and/or other materials
provided with the distribution.
THIS SOFTWARE IS PROVIDED BY Andrea Leofreddi ``AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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