gitmonster/node-whiteboard — comment on commit fd5678297d026a85d19010b7486ed6a90de053a4
File: www/index.html line 39
By jordanmessina:

Check out: http://html5.litten.com/how-to-drag-and-drop-on-an-html5-canvas/

![Canvas Offset](http://html5.litten.com/wp-content/uploads/2010/07/canvasoffset.gif).