代码片段： wander (how far do you stray?) friction (f>1: faster, faster! f<1: slow....) mouse distance (how far do you feel it?): mouse force (how powerful is the effect!) particle spring force: (springy or bouncy (strict or flexible))
THIS PROJECT IS NO MORE MAINTAINED. A good alternative is at https://github.com/google/hover Springy heads A chat head library for use within your apps. This includes all the UI physics and spring animations which drive multi user chat behaviour and
