PointAnimationUsingKeyFrames class

Animates the value of a Point property along a set of KeyFrames.

Inheritance

Object

  DependencyObject

    Timeline

      PointAnimationUsingKeyFrames

Syntax

public sealed class PointAnimationUsingKeyFrames : Timeline

<PointAnimationUsingKeyFrames>
  oneOrMorePointKeyFrames
</PointAnimationUsingKeyFrames>

XAML Values

oneOrMorePointKeyFrames

One or more object elements that define the key frames for the animation. These object elements represent one of the classes deriving from PointKeyFrame. These are typically any combination of LinearPointKeyFrame, EasingPointKeyFrame, DiscretePointKeyFrame, and SplinePointKeyFrame. Object elements defined here become members of the collection when code accesses the KeyFrames property at run time.

Attributes

ActivatableAttribute(NTDDI_WIN8)

ContentPropertyAttribute(Name=KeyFrames)

MarshalingBehaviorAttribute(Agile)

StaticAttribute(Windows.UI.Xaml.Media.Animation.IPointAnimationUsingKeyFramesStatics, NTDDI_WIN8)

ThreadingAttribute(Both)

VersionAttribute(NTDDI_WIN8)

WebHostHiddenAttribute()

Members

The PointAnimationUsingKeyFrames class has these types of members:

• Constructors
• Events
• Methods
• Properties

Constructors

The PointAnimationUsingKeyFrames class has these constructors.

Events

The PointAnimationUsingKeyFrames class has these events.

Methods

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

Properties

The PointAnimationUsingKeyFrames class has these properties.

Examples

The following example moves an ellipse along a triangular path. The example uses the PointAnimationUsingKeyFrames class to animate the Center property of an EllipseGeometry. This animation uses three key frames in the following manner:

1. During the first half second, it uses an instance of the LinearPointKeyFrame class to move the ellipse along a path at a steady rate from its starting position. Linear key frames such as LinearPointKeyFrame create a smooth linear interpolation between values.

2. During the end of the next half second, it uses an instance of the DiscretePointKeyFrame class to suddenly move the ellipse along the path to the next position. Discrete key frames like DiscretePointKeyFrame create sudden jumps between values.

3. During the final two seconds, it uses an instance of the SplinePointKeyFrame class to move the ellipse back to its starting position. Spline key frames like SplinePointKeyFrame create a variable transition between values according to the values of the KeySpline property. In this example, the animation begins slowly and speeds up exponentially toward the end of the time segment.

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

            <!-- Animating the Center property uses 3 KeyFrames, which animate
             the ellipse allong a triangular path. -->
            <PointAnimationUsingKeyFrames
          Storyboard.TargetProperty="Center"
          Storyboard.TargetName="MyAnimatedEllipseGeometry"
          Duration="0:0:5" RepeatBehavior="Forever" EnableDependentAnimation="True">

                <!-- Over the first half second, Using a LinearPointKeyFrame, the ellipse 
               moves steadily from its starting position along the first line of the 
               trianglar path.  -->
                <LinearPointKeyFrame KeyTime="0:0:0.5" Value="100,300" />

                <!-- Using a DiscretePointKeyFrame, the ellipse suddenly changes position
               after the first second of the animation. -->
                <DiscretePointKeyFrame KeyTime="0:0:1" Value="400,300" />

                <!-- Using a SplinePointKeyFrame, the ellipse moves back to its starting
               position. It moves slowly at first and then speeds up. This key frame 
               takes 2 seconds to complete. -->
                <SplinePointKeyFrame KeySpline="0.6,0.0 0.9,0.00" 
                 KeyTime="0:0:3" Value="200,100" />
            </PointAnimationUsingKeyFrames>
        </Storyboard>
    </Canvas.Resources>
    <Path Fill="Blue" Loaded="Start_Animation">
        <Path.Data>

            <!-- Describes an ellipse. -->
            <EllipseGeometry x:Name="MyAnimatedEllipseGeometry"
             Center="200,100" RadiusX="15" RadiusY="15" />
        </Path.Data>
    </Path>
</Canvas>

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

Requirements

See also

Storyboarded animations

Build date: 12/4/2012