How do I rotate from gesture?

Hello,

sorry about this topic title, I know it's not clear, but I have no better idea to say that : I would like to use the touch input to make the player rotate a wheel (kind of like in Ouendan ) : the player make a circle movement on the screen, and the sprite rotate accordingly

here is an example from Ouendan

.

Anyone got an idea?

If anyone need to do this, I succeeded via basic trigonometry ( atan(X/Y) )