d3js : http://animateddata.co.uk/lab/d3-tree/#
javaFx2 : https://docs.oracle.com/javafx/2/animations/img/tree-only.jpg
https://docs.oracle.com/javafx/2/animations/jfxpub-animations.htm
https://docs.oracle.com/javafx/2/animations/tree-animation.htm#CACCEGFG