CAAnimation that calls a method in periodic animation-progress intervals?

Actually this is reliable. CoreAnimation is time based, so you could use the delegate to be notified when the animation really starts. And about calculating the bezier path... well look it this way: It could be worse if you would want to implement a surface in OpenGLES you would have to calculate a Cubic Bezier!.

Lol. Your case is only one dimension, is not that hard if you know the maths.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.