Radio dial type functionality as seen on Where To? App

Answer 1

I actually think it's a single image that has it's layer rotated in response to touch events and then calculates which is the active button based on the radial distance from the original position. It's not horribly complicated code (touchset change is left or right and rotate in response to that, modify the hittest method to respect the radial deltas) but the math is more than I can do before six cups of coffee.