Статья
11/18/2011

EasingPointKeyFrame Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Defines a property that enables you to associate an easing function with a PointAnimationUsingKeyFrames key-frame animation.

Inheritance Hierarchy

System.Object
  System.Windows.DependencyObject
    System.Windows.Media.Animation.PointKeyFrame
      System.Windows.Media.Animation.EasingPointKeyFrame

Namespace: System.Windows.Media.Animation
Assembly: System.Windows (in System.Windows.dll)

Syntax

'Declaration
Public NotInheritable Class EasingPointKeyFrame _
    Inherits PointKeyFrame

public sealed class EasingPointKeyFrame : PointKeyFrame

<EasingPointKeyFrame .../>

The EasingPointKeyFrame type exposes the following members.

Constructors

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

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Properties

	Name	Description
	Dispatcher	Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
	EasingFunction	Gets or sets the easing function that is applied to the key frame.
	KeyTime	Gets or sets the time at which the key frame's target Value should be reached. (Inherited from PointKeyFrame.)
	Value	Gets or sets the key frame's target value. (Inherited from PointKeyFrame.)

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Methods

	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.)
	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.)

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Fields

	Name	Description
	EasingFunctionProperty	Identifies the EasingFunction dependency property.

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Examples

The following example shows how to use key frames with easing functions associated with them to create an animation that simulates an oval going up in the air and falling back down, where it bounces to a stop.

Run this sample

<Canvas Width="400" Height="300">
    <Canvas.Resources>
        <Storyboard x:Name="myStoryboard">

            <PointAnimationUsingKeyFrames
             Storyboard.TargetProperty="Center"
             Storyboard.TargetName="MyAnimatedEllipseGeometry">

                <!-- This keyframe animates the ellipse up to the crest 
                     where it slows down and stops. -->
                <EasingPointKeyFrame Value="50,20" KeyTime="00:00:02">
                    <EasingPointKeyFrame.EasingFunction>
                        <CubicEase EasingMode="EaseOut"/>
                    </EasingPointKeyFrame.EasingFunction>
                </EasingPointKeyFrame>

                <!-- This keyframe animates the ellipse back down and makes
                     it bounce. -->
                <EasingPointKeyFrame Value="50,200" KeyTime="00:00:06">
                    <EasingPointKeyFrame.EasingFunction>
                        <BounceEase Bounces="5" EasingMode="EaseOut"/>
                    </EasingPointKeyFrame.EasingFunction>
                </EasingPointKeyFrame>

            </PointAnimationUsingKeyFrames>
        </Storyboard>
    </Canvas.Resources>
    <Path MouseLeftButtonDown="Mouse_Clicked" Fill="Blue">
        <Path.Data>

            <!-- Describes an ellipse. -->
            <EllipseGeometry x:Name="MyAnimatedEllipseGeometry"
             Center="50,200" RadiusX="15" RadiusY="15" />
        </Path.Data>
    </Path>
</Canvas>

' When the user clicks the ellipse, the animation
' begins. 
Private Sub Mouse_Clicked(ByVal sender As Object, ByVal e As MouseEventArgs)
    myStoryboard.Begin()
End Sub

// When the user clicks the ellipse, the animation
// begins. 
private void Mouse_Clicked(object sender, MouseEventArgs e)
{
    myStoryboard.Begin();
}

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

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.

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