This represents an easing function that creates an animation that accelerates and/or decelerates using a sine formula f(t) = [1 - [sin(1 - t) * [pi / 2]]]. Add the EasingMode property to accelerate and/or decelerate the effect. Let's add the following code inside the StackPanel:
<RadioButton GroupName="AnimationSelector" Content="SineEase - 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> <SineEase EasingMode="...