DoubleAnimation Class

July 28, 2014

Animates the value of a Double property between two target values using linear interpolation over a specified Duration.

System.Object
  System.Windows.DependencyObject
    System.Windows.Media.Animation.Timeline
      System.Windows.Media.Animation.DoubleAnimation

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

public sealed class DoubleAnimation : Timeline
<DoubleAnimation    />

The DoubleAnimation type exposes the following members.

  NameDescription
Public methodDoubleAnimationInitializes a new instance of the DoubleAnimation class.
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  NameDescription
Public propertyAutoReverseGets or sets a value that indicates whether the timeline plays in reverse after it completes a forward iteration. (Inherited from Timeline.)
Public propertyBeginTimeGets or sets the time at which this Timeline should begin. (Inherited from Timeline.)
Public propertyByGets or sets the total amount by which the animation changes its starting value.
Public propertyDispatcherGets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
Public propertyDurationGets or sets the length of time for which this timeline plays, not counting repetitions. (Inherited from Timeline.)
Public propertyEasingFunctionGets or sets the easing function applied to this animation.
Public propertyFillBehaviorGets or sets a value that specifies how the animation behaves after it reaches the end of its active period. (Inherited from Timeline.)
Public propertyFromGets or sets the animation's starting value.
Public propertyRepeatBehaviorGets or sets the repeating behavior of this timeline. (Inherited from Timeline.)
Public propertySpeedRatioGets or sets the rate, relative to its parent, at which time progresses for this Timeline. (Inherited from Timeline.)
Public propertyToGets or sets the animation's ending value.
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  NameDescription
Public methodCheckAccessDetermines whether the calling thread has access to this object. (Inherited from DependencyObject.)
Public methodClearValueClears the local value of a dependency property. (Inherited from DependencyObject.)
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetAnimationBaseValueReturns any base value established for a Windows Phone dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetValueReturns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodReadLocalValueReturns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
Public methodSetValueSets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)
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  NameDescription
Public eventCompletedOccurs when the Storyboard object has completed playing. (Inherited from Timeline.)
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  NameDescription
Public fieldStatic memberByPropertyIdentifies the By dependency property.
Public fieldStatic memberEasingFunctionPropertyIdentifies the EasingFunction dependency property.
Public fieldStatic memberFromPropertyIdentifies the From dependency property.
Public fieldStatic memberToPropertyIdentifies the To dependency property.
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An animation updates the value of a property over a period of time. An animation effect can be subtle, such as moving a Shape a few pixels left and right, or dramatic, such as enlarging an object to 200 times its original size while spinning it and changing its color. To create an animation, you associate an animation with an object's property value.

Target Values

The DoubleAnimation class creates a transition between two target values. To set its target values, use its From, To, and By properties. The following table summarizes how the From, To, and By properties can be used together or separately to determine an animation's target values.

Properties specified

Resulting behavior

From

The animation progresses from the value specified by the From property to the base value of the property being animated or to a previous animation's output value, depending on how the previous animation is configured.

From and To

The animation progresses from the value specified by the From property to the value specified by the To property.

From and By

The animation progresses from the value specified by the From property to the value specified by the sum of the From and By properties.

To

The animation progresses from the animated property's base value or a previous animation's output value to the value specified by the To property.

By

The animation progresses from the base value of the property being animated or a previous animation's output value to the sum of that value and the value specified by the By property.

NoteNote:

If you set both the To and By properties, the To property takes precedence and the By property is ignored.

To use other interpolation methods or animate between more than two target values, use a DoubleAnimationUsingKeyFrames object.

The following example shows how to use DoubleAnimation to create a rectangle that fades in and out of view after it is loaded.


<StackPanel>
    <StackPanel.Resources>
        <Storyboard x:Name="myStoryboard">
            <DoubleAnimation
          Storyboard.TargetName="MyAnimatedRectangle"
          Storyboard.TargetProperty="Opacity"
          From="1.0" To="0.0" Duration="0:0:5" 
          AutoReverse="True" RepeatBehavior="Forever" />
        </Storyboard>
    </StackPanel.Resources>

    <Rectangle Loaded="Start_Animation" x:Name="MyAnimatedRectangle"
     Width="100" Height="100" Fill="Blue" />

</StackPanel>



// Start the animation when the object loads
private void Start_Animation(object sender, EventArgs e)
{
    myStoryboard.Begin();
}


Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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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