At work I have been writing an Fx class in Javascript for a component that will be used on one of our clients websites. While writing the Fx class, we (work team) decided that easing effects would be needed to give it that nice feel too it. While researching easing, I came across a website that had Actionscript easing equations, and now looking at some of the Javascript frameworks out there, they have also used the equations. It seems that Robert Penner’s equations are extremely popular, and best of all, extremely easy to implement into Javascript.

Here is Robert Penner’s website…

http://www.robertpenner.com/easing/

I have implemented most of the easing equations into our Fx class, though we were mainly interested in the Back class, done some testing, and found they work extremely well.

So if you are thinking of writing your own Fx class, I highly suggest looking at Roberts equations, they seem to be the standard.