Assembly: PresentationCore (in presentationcore.dll)
XML Namespace: http://schemas.microsoft.com/winfx/2006/xaml/presentation
A key frame defines a segment of the Point3DAnimationUsingKeyFrames to which it belongs. Each key frame has a target Value and a KeyTime. The KeyTime specifies the time at which the key frame's Value should be reached. A key frame animates from the target value of the previous key frame to its own target value. It starts when the previous key frame ends and ends when its own key time is reached.
Discrete key frames like DiscretePoint3DKeyFrame create sudden "jumps" between values (no interpolation). In other words, the animated property does not change until the key frame's key time is reached, at which point the animated property goes suddenly to the target value.
In the following example, Point3DAnimationUsingKeyFrames is used to animate the position of a PerspectiveCamera in a 3D scene. In addition, Vector3DAnimationUsingKeyFrames is used to animate the direction the camera is pointing in the 3D scene. Both of these animations use several key frames which create a series of animation effects:
DiscretePoint3DKeyFrame and DiscreteVector3DKeyFrame are used to create sudden "jumps" between values (no interpolation).
SplinePoint3DKeyFrame and SplineVector3DKeyFrame are used to create a variable transition between values depending on the KeySpline property. In the example below, the animation starts off slow but toward the end of the time segment, speeds up exponentially.
<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" > <DockPanel> <Viewbox> <Canvas Width="321" Height="201"> <Viewport3D Name="MyAnimatedObject" ClipToBounds="True" Width="150" Height="150" Canvas.Left="0" Canvas.Top="10"> <!-- Defines the camera used to view the 3D object. The position and direction of this camera is animated in the Storyboard below. --> <Viewport3D.Camera> <PerspectiveCamera x:Name="myPerspectiveCamera" Position="0,0,2" LookDirection="0,0,-1" FieldOfView="45" /> </Viewport3D.Camera> <Viewport3D.Children> <ModelVisual3D> <ModelVisual3D.Children> <!-- This resource defines the 3D cube that is used in this example.--> <StaticResource ResourceKey="PictureCubeModelVisual3DResource" /> </ModelVisual3D.Children> </ModelVisual3D> </Viewport3D.Children> <Viewport3D.Triggers> <EventTrigger RoutedEvent="Viewport3D.Loaded"> <BeginStoryboard> <Storyboard> <!-- This animation moves the camera around the object. The object is not changing position or rotating but moving the camera makes it appear that it is.--> <Point3DAnimationUsingKeyFrames Storyboard.TargetName="myPerspectiveCamera" Storyboard.TargetProperty="Position" > <Point3DAnimationUsingKeyFrames.KeyFrames> <!-- Using a LinearPoint3DKeyFrame, the camera moves steadily from its starting position to a new position that is to the upper right and a little farther away. This happens over the first second of the animation. --> <LinearPoint3DKeyFrame Value="1,2,3" KeyTime="0:0:1" /> <!-- Using a DiscretePoint3DKeyFrame, the camera suddenly moves farther away from the object. This happens immdeiately after the first 1 and a half second of the animation. --> <DiscretePoint3DKeyFrame Value="1,2,5" KeyTime="0:0:1.5" /> <!-- Using a SplinePoint3DKeyFrame, the camera moves back to its starting point. The animation starts out slowly at first and then speeds up. This KeyFrame ends after the fourth second. --> <SplinePoint3DKeyFrame KeySpline="0.6,0.0 0.9,0.00" Value="0,0,2" KeyTime="0:0:4" /> </Point3DAnimationUsingKeyFrames.KeyFrames> </Point3DAnimationUsingKeyFrames> <!-- As the position of the camera changes using the Point3DAnimation above, the direction the camera is pointing swivels to keep the object within the view of the camera. --> <Vector3DAnimationUsingKeyFrames Storyboard.TargetName="myPerspectiveCamera" Storyboard.TargetProperty="LookDirection" > <Vector3DAnimationUsingKeyFrames.KeyFrames> <!-- Using a LinearVector3DKeyFrame, the camera swivels steadily from its starting position down and to the left. This happens over the first second of the animation. --> <LinearVector3DKeyFrame Value="-1,-2,-3" KeyTime="0:0:1" /> <!-- Using a DiscreteVector3DKeyFrame, the camera suddenly swivels up. This happens immdeiately after the first 1 and a half second of the animation. --> <DiscreteVector3DKeyFrame Value="-1,-1,-3" KeyTime="0:0:1.5" /> <!-- Using a SplineVector3DKeyFrame, the camera swivels back to its starting point. The animation starts out slowly at first and then speeds up. This KeyFrame ends after the fourth second. --> <SplineVector3DKeyFrame KeySpline="0.6,0.0 0.9,0.00" Value="0,0,-1" KeyTime="0:0:4" /> </Vector3DAnimationUsingKeyFrames.KeyFrames> </Vector3DAnimationUsingKeyFrames> </Storyboard> </BeginStoryboard> </EventTrigger> </Viewport3D.Triggers> </Viewport3D> </Canvas> </Viewbox> </DockPanel> </Page>
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.