Flex SpringGraph in Actionscript 3.0

How can I have the s开发者_Go百科ame effect as of http://mark-shepherd.com/SpringGraph/RoamerDemo/bin/RoamerDemo.html using only actionscript?

I've implemented the same algorythm of graph nodes aligment a few years ago in http://kachurovskiy.com/f/p/dmvow/DMVoW.html . You can find the source code at http://code.google.com/p/dmvow/ although it's not so simple to extract the layout code.