reactive-animation

var a = new Animation {
  DurationInFrames = Animation.FromTimeSpanToDurationInFrames(3),
  EasingFunction = ef => Easing.EaseInOut(ef, EasingType.Quadratic)
};

a.AnimateOnControlThread(
  form, 
  ObservableHelper.FixedValue((float)0.8),
  ObservableHelper.FixedValue((float)1),
  v => f.Opacity = v.CurrentValue
);

a.Start();

var cts = LinearAnimation.AnimateControl(
  button, 
  ObservableHelper.FixedValue(new Point(0, 150)), // animate until at this position
  ObservableHelper.FixedValue(5), // speed to move at
  true); // keep in same relative position when the control's parent resizes
// returns a CancellationTokenSource that you can use to cancel the animation