Represents an easing function that creates an animation that accelerates and/or decelerates using the formula f(t) = tp where p is equal to the Power property.
Assembly: System.Windows (in System.Windows.dll)
Thetype exposes the following members.
|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.)|
|Power||Gets or sets the exponential power of the animation interpolation. For example, a value of 7 creates an animation interpolation curve that follows the formula f(t) = t7.|
|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 Silverlight 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.)|
You can control whether the animation accelerates, decelerates, or both by specifying the EasingMode. The following graph demonstrates the different values of EasingMode, where f(t) represents the animation progress and t represents time.
By using the function, you can specify how quickly acceleration/deceleration takes place by specifying the Power property:
f(t) = tp where p is equal to the Power property.
Because of this, the function can be substituted for QuadraticEase (f(t) = t2), CubicEase (f(t) = t3), QuarticEase (f(t) = t4), and QuinticEase (f(t) = t5). For example, if you wanted to use a function to create the same behavior as a QuadraticEase function (f(t) = t2), you would specify a Power property value of 2.
There are several other easing functions besides which you can explore using the following sample.
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 a easing function with a Power property value of 20 to a DoubleAnimation to create a decelerating animation. Because the Power value is so high, the deceleration is sudden compared to if you used a lower value.
<StackPanel x:Name="LayoutRoot" Background="White"> <StackPanel.Resources> <Storyboard x:Name="myStoryboard"> <DoubleAnimation From="30" To="200" Duration="00:00:3" Storyboard.TargetName="myRectangle" Storyboard.TargetProperty="Height"> <DoubleAnimation.EasingFunction> <PowerEase Power="20" EasingMode="EaseOut"/> </DoubleAnimation.EasingFunction> </DoubleAnimation> </Storyboard> </StackPanel.Resources> <Rectangle x:Name="myRectangle" MouseLeftButtonDown="Mouse_Clicked" Fill="Blue" Width="200" Height="30" /> </StackPanel>
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.