DiscretePointKeyFrame
DiscretePointKeyFrame
DiscretePointKeyFrame
DiscretePointKeyFrame
Class
Definition
public : sealed class DiscretePointKeyFrame : PointKeyFrame, IDiscretePointKeyFramepublic sealed class DiscretePointKeyFrame : PointKeyFrame, IDiscretePointKeyFramePublic NotInheritable Class DiscretePointKeyFrame Inherits PointKeyFrame Implements IDiscretePointKeyFrame// This API is not available in Javascript.
<DiscretePointKeyFrame />
- Inheritance
-
DiscretePointKeyFrameDiscretePointKeyFrameDiscretePointKeyFrameDiscretePointKeyFrame
- Attributes
| Device family |
Windows 10 (introduced v10.0.10240.0)
|
| API contract |
Windows.Foundation.UniversalApiContract (introduced v1)
|
Inherited Members
Inherited methods
Inherited properties
Examples
This XAML 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:
- 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.
- 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.
- 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();
}
' Start the animation when the object loads
Private Sub Start_Animation(ByVal sender As Object, ByVal e As EventArgs)
myStoryboard.Begin()
End Sub
Remarks
Key-frame animations permit more than one target value that is reached at a point along the animation timeline. In other words each key frame can specify a different intermediate value, and the last key frame reached is the final animation value. By specifying multiple values to animate, you can make more complex animations. You can mix discrete, linear, and spline keyframes in the same keyframe collection.
For more info on how to use key-frame animations, see Key-frame animations and easing function animations.
Constructors
DiscretePointKeyFrame() DiscretePointKeyFrame() DiscretePointKeyFrame() DiscretePointKeyFrame()
Initializes a new instance of the DiscretePointKeyFrame class.
public : DiscretePointKeyFrame()public DiscretePointKeyFrame()Public Sub New()// This API is not available in Javascript.