QuarticEase

Like QuadraticEase, you can also define QuarticEase to create an animation that accelerates/decelerates using the formula f(t) = t4. You can use PowerEase to create the same behavior by specifying Power="4". Let's add the following mark-up inside our StackPanel to define the animation with the said easing function:

<RadioButton GroupName="AnimationSelector" 
             Content="QuarticEase - EaseInOut" 
             Margin="4"> 
    <RadioButton.Triggers> 
        <EventTrigger RoutedEvent="RadioButton.Checked"> 
            <BeginStoryboard> 
                <Storyboard AutoReverse="True"> 
                    <DoubleAnimation  
                     Storyboard.TargetName="circle" 
                     Storyboard.TargetProperty="(Canvas.Left)" 
                     To="350"> 
                        <DoubleAnimation.EasingFunction> 
  ...