how to make an arrow actor rotate around a circle (puzzle bubble style)

FViMagination

hi everybody,
my idea is to make a game like puzzle bubble, and i was wondering how to make an arrow rotate around a central circle on the bottom of the screen (iPhone portrait) following the finger (or mouse) direction, considering that mouse or finger will go left or right only, still on the bottom of the screen.
then, with a button I'll have to spawn an actor inside the circle and move it to the arrow direction to hit the other balls.
is it possible to make it with GS?

thanks so much!

GLGAMES

have you looked at the canon physics demo in GS , you should be able to extract the necessary rules out

FViMagination

i haven't looked at it, i'll do that right away, thank you!