ElasticEase Class

Definition

Namespace:

Windows.UI.Xaml.Media.Animation

Represents an easing function that creates an animation that resembles a spring oscillating back and forth until it comes to rest.

public ref class ElasticEase sealed : EasingFunctionBase

/// [Windows.Foundation.Metadata.ContractVersion(Windows.Foundation.UniversalApiContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
/// [Windows.Foundation.Metadata.Activatable(65536, "Windows.Foundation.UniversalApiContract")]
class ElasticEase final : EasingFunctionBase

[Windows.Foundation.Metadata.ContractVersion(typeof(Windows.Foundation.UniversalApiContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
[Windows.Foundation.Metadata.Activatable(65536, "Windows.Foundation.UniversalApiContract")]
public sealed class ElasticEase : EasingFunctionBase

Public NotInheritable Class ElasticEase
Inherits EasingFunctionBase

<ElasticEase .../>

Inheritance

Object Platform::Object IInspectable DependencyObject EasingFunctionBase ElasticEase

Attributes

ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

Windows requirements

Device family	Windows 10 (introduced in 10.0.10240.0)
API contract	Windows.Foundation.UniversalApiContract (introduced in v1.0)

Examples

This XAML example applies an ElasticEase easing function to a DoubleAnimation to create an animation that resembles a spring oscillating back and forth until it comes to rest.

<StackPanel x:Name="LayoutRoot" >
    <StackPanel.Resources>
        <Storyboard x:Name="myStoryboard">
            <DoubleAnimation From="1" To="6" Duration="00:00:3" 
                Storyboard.TargetName="rectScaleTransform" 
                Storyboard.TargetProperty="ScaleY">
                <DoubleAnimation.EasingFunction>
                    
                    <!-- Elastic easing function assigned to From/To animation -->
                    <ElasticEase x:Name="myElasticEase" Oscillations="3" 
                     Springiness="1" EasingMode="EaseOut"/>
                </DoubleAnimation.EasingFunction>
            </DoubleAnimation>
        </Storyboard>
    </StackPanel.Resources>

    <Rectangle PointerPressed="Pointer_Clicked" 
     Fill="Blue" Width="200" Height="30">
        <Rectangle.RenderTransform>
            <ScaleTransform x:Name="rectScaleTransform" />
        </Rectangle.RenderTransform>
    </Rectangle>

</StackPanel>

// When the user clicks the rectangle, the animation
// begins. 
private void Pointer_Clicked(object sender, PointerRoutedEventArgs e)
{
    myStoryboard.Begin();
}

' When the user clicks the rectangle, the animation
' begins. 
Private Sub Pointer_Clicked(ByVal sender As Object, ByVal e As PointerRoutedEventArgs)
    myStoryboard.Begin()
End Sub

Remarks

ElasticEase is one of the two easing functions that can produce a value outside of the normal From/To range. (The other is BackEase.) As the easing function begins, the value oscillates positive and negative around the From value until it reaches an eventual positive amplitude that is the To value. The Springiness property modifies the sinusoidal character of this oscillation. With Springiness of 0, the oscillation is basically sinusoidal and resembles a typical diagram of a spring's motion. With larger Springiness values, it's like dampening the spring's motion.

The Oscillations property declares how many times the function oscillates and crosses into values that are actually below the starting From value.

You might get best results by just experimenting with the Springiness, Oscillations and EasingMode properties until the animation is visually doing what you want for your animated property value scenario.

BounceEase is a similar easing function that works well for physics emulation in animations. The difference with ElasticEase is that a BounceEase won't ever go outside the From/To range. Another way to conceptualize the two easing functions is that ElasticEase is what you might use to animate the plucking of a string, whereas BounceEase is what you might use to show the bounce of a ball against a line or plane.

An easing function can be applied to the EasingFunction properties of From/To/By animations, or to the EasingFunction properties of key-frame types used for the Easing variants of key-frame animations. For more info, see Key-frame animations and easing function animations.

Constructors

ElasticEase()

Initializes a new instance of the ElasticEase class.

Properties

Dispatcher	Gets the CoreDispatcher that this object is associated with. The CoreDispatcher represents a facility that can access the DependencyObject on the UI thread even if the code is initiated by a non-UI thread. (Inherited from DependencyObject)
EasingMode	Gets or sets a value that specifies how the animation interpolates. (Inherited from EasingFunctionBase)
Oscillations	Gets or sets the number of times the target slides back and forth over the animation destination.
OscillationsProperty	Identifies the Oscillations dependency property.
Springiness	Gets or sets the stiffness of the spring. The smaller the Springiness value is, the stiffer the spring and the faster the elasticity decreases in intensity over each oscillation.
SpringinessProperty	Identifies the Springiness dependency property.

Methods

ClearValue(DependencyProperty)	Clears the local value of a dependency property. (Inherited from DependencyObject)
Ease(Double)	Transforms normalized time to control the pace of an animation. (Inherited from EasingFunctionBase)
GetAnimationBaseValue(DependencyProperty)	Returns any base value established for a dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject)
GetValue(DependencyProperty)	Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject)
ReadLocalValue(DependencyProperty)	Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject)
RegisterPropertyChangedCallback(DependencyProperty, DependencyPropertyChangedCallback)	Registers a notification function for listening to changes to a specific DependencyProperty on this DependencyObject instance. (Inherited from DependencyObject)
SetValue(DependencyProperty, Object)	Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject)
UnregisterPropertyChangedCallback(DependencyProperty, Int64)	Cancels a change notification that was previously registered by calling RegisterPropertyChangedCallback. (Inherited from DependencyObject)

See also

• PowerEase
• BackEase
• BounceEase
• CircleEase
• CubicEase
• ExponentialEase
• QuadraticEase
• QuarticEase
• QuinticEase
• SineEase
• Storyboarded animations
• Key-frame animations and easing function animations