getValueFromNanos   
  open override fun getValueFromNanos(playTimeNanos: Long, initialValue: V, targetValue: V, initialVelocity: V): V
Calculates the value of the animation at given the playtime, with the provided start/end values, and start velocity.
Parameters
playTimeNanos  
time since the start of the animation
initialValue 
start value of the animation
targetValue 
end value of the animation
initialVelocity 
start velocity of the animation