A little plugin for the Raphaël Javascript SVG library enabling canvas-wide zoom, pan and drag functionality.
Create a Raphaël paper object, then call the ZPD initialization function with the systems to enable (before performing any drawing operations):
paper.ZPD({ zoom: true, pan: true, drag: true });
Repeated calls to this function may be used to alter the settings as needed. You may disable the drag functionality on the basis of individual Raphaël elements like so:
el.node.draggable = false;
The ZPD function works by creating an SVG group element (with id 'viewport') and altering the paper's canvas to point at it, causing all following elements created via the paper to be placed within. This will potentially break any plugins or Raphaël functions that rely on paper.canvas pointing to the root SVG object, though I have yet to encounter such a situation.
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
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of conditions and the following disclaimer in the documentation and/or other materials
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