Rotate graphic towards mouse in WPF (like an analog dial)

Question

In WPF/C# how would I rotate a \"graphic\" to face the current mouse position?

Basically what I want is a \"wheel\" UI Control (like an analog volume dial

Answer 1

To add to that post, the angle between the mouse point and the object point is calculated like:

dot = currentLocation.X * objectPosition.X + currentLocation.Y * objectPosition.Y;
angle = Math.Acos(dot);