Windows Dev Center

ElasticEase class

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

Inheritance

Object
  DependencyObject
    EasingFunctionBase
      ElasticEase

Syntax


public sealed class ElasticEase : EasingFunctionBase


<ElasticEase .../>

Members

The ElasticEase class has these types of members:

Constructors

The ElasticEase class has these constructors.

ConstructorDescription
ElasticEase Initializes a new instance of the ElasticEase class.

 

Methods

The ElasticEase class has these methods. It also inherits methods from the Object class.

MethodDescription
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)
GetAnimationBaseValue Returns any base value established for a dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject)
GetValue Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject)
ReadLocalValue Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject)
RegisterPropertyChangedCallback Registers an instance-specific property value for a property-changed notification that comes from the core property system. (Inherited from DependencyObject)
SetValue Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject)
UnregisterPropertyChangedCallback Cancels a change notification that was previously registered by calling RegisterPropertyChangedCallback. (Inherited from DependencyObject)

 

Properties

The ElasticEase class has these properties.

PropertyAccess typeDescription

Dispatcher

Read-onlyGets 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

Read/writeGets or sets a value that specifies how the animation interpolates. (Inherited from EasingFunctionBase)

Oscillations

Read/writeGets or sets the number of times the target slides back and forth over the animation destination.

OscillationsProperty

Read-onlyIdentifies the Oscillations dependency property.

Springiness

Read/writeGets 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

Read-onlyIdentifies the Springiness dependency property.

 

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.

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();
}


Requirements (Windows 10 device family)

Device family

Universal

API contract

Windows.Foundation.UniversalApiContract, introduced version 1.0

Namespace

Windows.UI.Xaml.Media.Animation
Windows::UI::Xaml::Media::Animation [C++]

Metadata

Windows.Foundation.UniversalApiContract.winmd

Requirements (Windows 8.x and Windows Phone 8.x)

Minimum supported client

Windows 8 [Windows Store apps only]

Minimum supported server

Windows Server 2012 [Windows Store apps only]

Minimum supported phone

Windows Phone 8.1 [Windows Runtime apps only]

Namespace

Windows.UI.Xaml.Media.Animation
Windows::UI::Xaml::Media::Animation [C++]

Metadata

Windows.winmd

Attributes

[MarshalingBehavior(Agile)]
[Threading(Both)]
[Version(0x06020000)]
[WebHostHidden()]

See also

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

 

 

Show:
© 2015 Microsoft