how to implement water animation in iphone(ripple animation)?

Question

I have implement one game application .In that game i want to implement wateer animation.PLease give me idea about that.

same like:http://www.heikobehrens.net/2009/10/02/burlington-ducky-iphone-app/

Answer 1

Use the code here as a starting point.

Answer 2

Sure, easily done. Start by solving the Wave Equation in two dimensions:

http://en.wikipedia.org/wiki/Wave_equation

Then write a program that uses the simulated wave to distort the image.

UPDATE: kvb points out that this might be rather more work than necessary, and now that I think about it a bit more, it probably is. Rather than solving the wave equation analytically, you could instead write a simple physics engine that simulates the surface in some other way. For example, you could represent the surface as a flat grid of points where each point is connected to its neighbours by springs. The physics of springs are easy to simulate; you just make a restoring force proportional to the deflection of the spring. Make sure to add a damping effect so that the system settles down eventually. Moving one of the points above the plane and stretching its springs should send ripples out through the mesh.