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Point3DAnimationUsingKeyFrames Class

Animates the value of a Point3D property along a set of KeyFrames.

Namespace: System.Windows.Media.Animation
Assembly: PresentationCore (in presentationcore.dll)
XML Namespace:  http://schemas.microsoft.com/winfx/2006/xaml/presentation

[ContentPropertyAttribute("KeyFrames")] 
public class Point3DAnimationUsingKeyFrames : Point3DAnimationBase, IKeyFrameAnimation, IAddChild
/** @attribute ContentPropertyAttribute("KeyFrames") */ 
public class Point3DAnimationUsingKeyFrames extends Point3DAnimationBase implements IKeyFrameAnimation, IAddChild
ContentPropertyAttribute("KeyFrames") 
public class Point3DAnimationUsingKeyFrames extends Point3DAnimationBase implements IKeyFrameAnimation, IAddChild
<Point3DAnimationUsingKeyFrames>
  KeyFrames
</Point3DAnimationUsingKeyFrames>

A key frame animation's target values are defined by its KeyFrames property, which contains a collection of Point3DKeyFrame objects. Each Point3DKeyFrame defines a segment of the animation with its own target Value and KeyTime. When the animation runs, it progresses from one key value to the next at the specified key times.

There are three types of Point3DKeyFrame classes, one for each supported interpolation method: LinearPoint3DKeyFrame, DiscretePoint3DKeyFrame, and SplinePoint3DKeyFrame.

Unlike a Point3DAnimation, a Point3DAnimationUsingKeyFrames can have more than two of target values. You can also control the interpolation method of individual Point3DKeyFrame segments.

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:

  1. LinearPoint3DKeyFrame and LinearVector3DKeyFrame are used to create a smooth, linear interpolation between values.

  2. DiscretePoint3DKeyFrame and DiscreteVector3DKeyFrame are used to create sudden "jumps" between values (no interpolation).

  3. 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>

System.Object
   System.Windows.Threading.DispatcherObject
     System.Windows.DependencyObject
       System.Windows.Freezable
         System.Windows.Media.Animation.Animatable
           System.Windows.Media.Animation.Timeline
             System.Windows.Media.Animation.AnimationTimeline
               System.Windows.Media.Animation.Point3DAnimationBase
                System.Windows.Media.Animation.Point3DAnimationUsingKeyFrames
Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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 Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0
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