ElasticEase Class

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

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

Inheritance Hierarchy


Namespace: System.Windows.Media.Animation
Assembly: System.Windows (in System.Windows.dll)
XMLNS for XAML: Not mapped to an xmlns.


Public Class ElasticEase _
    Inherits EasingFunctionBase
public class ElasticEase : EasingFunctionBase
<ElasticEase .../>

The ElasticEase type exposes the following members.


Name Description
ElasticEase Initializes a new instance of the ElasticEase class.



Name Description
Dispatcher Gets the Dispatcher this object is associated with. (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.
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.



Name Description
CheckAccess Determines whether the calling thread has access to this object. (Inherited from DependencyObject.)
ClearValue Clears the local value of a dependency property. (Inherited from DependencyObject.)
Ease Transforms normalized time to control the pace of an animation. (Inherited from EasingFunctionBase.)
EaseInCore Provides the logic portion of the easing function that you can override to produce the EaseIn mode of the custom easing function. (Overrides EasingFunctionBase..::.EaseInCore(Double).)
Equals(Object) Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Finalize Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
GetAnimationBaseValue Returns any base value established for a Windows Phone dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
GetHashCode Serves as a hash function for a particular type. (Inherited from Object.)
GetType Gets the Type of the current instance. (Inherited from Object.)
GetValue Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
ReadLocalValue Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
SetValue Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
ToString Returns a string that represents the current object. (Inherited from Object.)



Name Description
OscillationsProperty Identifies the Oscillations dependency property.
SpringinessProperty Identifies the Springiness dependency property.



You can control when in the "spring" behavior occurs in an animation by specifying the EasingMode property value. The following graph demonstrates the different values of EasingMode, where f(t) represents the animation progress and t represents time.

You can specify how many times the animation oscillates back and forth using the Oscillations property and how tight the springiness of the oscillations are using the Springiness property.


Because this animation causes values to oscillate back and forth, the animation might interpolate into negative numbers unexpectedly. This can cause errors when animating properties that do not allow negative numbers. For example, if you apply this animation to the Height of an object (e.g. from 0 to 200 with an EasingMode of EaseIn), the animation will attempt to interpolate through negative numbers for Height which will throw an error.

In addition to using the easing functions included in the run-time, you can create your own custom easing functions by inheriting from EasingFunctionBase.


The following 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" Background="Transparent">
        <Storyboard x:Name="myStoryboard">
            <DoubleAnimation From="30" To="200" Duration="00:00:4" 
                    <!-- Elastic easing function assigned to From/To animation -->
                    <ElasticEase x:Name="myElasticEase" Oscillations="3" 
                     Springiness="1" EasingMode="EaseOut"/>

    <Rectangle x:Name="myRectangle" MouseLeftButtonDown="Mouse_Clicked" 
     Fill="Blue" Width="200" Height="30" />

' When the user clicks the rectangle, the animation
' begins. 
Private Sub Mouse_Clicked(ByVal sender As Object, ByVal e As MouseEventArgs)
End Sub
// When the user clicks the rectangle, the animation
// begins. 
private void Mouse_Clicked(object sender, MouseEventArgs e)

Version Information

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0


Windows Phone

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

See Also


System.Windows.Media.Animation Namespace











Other Resources

Animations, motion, and output for Windows Phone