If the Pointer has a button pressed down at the time this method is called, it will return the
angle between the Pointer's
downY values and the current position.
If no button is held down, it will return the last recorded angle, based on where the Pointer was when the button was released.
The angle is based on the old position facing to the current position.
If you wish to get the current angle, based on the velocity of the Pointer, then
The angle between the Pointer's coordinates in radians.