CoreAnimation is awesome! specially because it lets you define a timing function for you animation. But, somehow I always find myself googling for a interactive bezier curve creator site or something that lets me draw the curve.
Really, I don't know how many times I've done the same search and sometimes I can't find the page I used in the past.
So this time I wrote a simple but interactive HTML (using the canvas) that helps me define a bezier path I can use to create a custom timing function for CoreAnimation:
Here is the source:
$ git clone email@example.com:nacho4d/BezierJS.git