Gewusst wie: Hinzufügen eines Animationsausgabewerts zu einem Animationsstartwert

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In diesem Beispiel wird das Hinzufügen eines Animationsausgabewerts zu einem Animationsstartwert veranschaulicht.

Beispiel

Die IsAdditive-Eigenschaft gibt an, ob der Ausgabewert einer Animation zum Startwert (Basiswert) einer animierten Eigenschaft addiert wird. Sie können die IsAdditive-Eigenschaft mit den meisten grundlegenden Animationen und den meisten Keyframeanimationen verwenden. Weitere Informationen finden Sie unter der Übersicht über Animationen und der Übersicht über Keyframeanimationen.

Im folgenden Beispiel wird der Effekt der Verwendung der DoubleAnimation.IsAdditive-Eigenschaft mit DoubleAnimation und der Verwendung der DoubleAnimationUsingKeyFrames.IsAdditive-Eigenschaft mit DoubleAnimationUsingKeyFrames veranschaulicht.

<Page xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
  <StackPanel Margin="20" >

    <!-- This rectangle is animated with DoubleAnimation and IsAdditive set to "True". -->
    <Rectangle Name="withIsAdditive"
      Width="100" Height="20" Margin="12,0,0,5" Fill="#AA3333FF" HorizontalAlignment="Left" />

    <!-- This rectangle is animated with DoubleAnimation and IsAdditive set to "False". -->
    <Rectangle Name="withoutIsAdditive"
      Width="100" Height="20" Margin="12,0,0,5" Fill="#AA3333FF" HorizontalAlignment="Left" />

    <!-- This rectangle is animated with DoubleAnimationUsingKeyFrames and IsAdditive set to "True". -->
    <Rectangle Name="withIsAdditiveUsingKeyFrames"
      Width="100" Height="20" Margin="12,0,0,5" Fill="#AA3333FF" HorizontalAlignment="Left" />

    <!-- This rectangle is animated with DoubleAnimationUsingKeyFrames and IsAdditive set to "False". -->
    <Rectangle Name="withoutIsAdditiveUsingKeyFrames"
      Width="100" Height="20" Margin="12,0,0,5" Fill="#AA3333FF" HorizontalAlignment="Left" />

    <!-- Create a button to restart the animations. -->
    <Button Margin="0,30,0,0" HorizontalAlignment="Left">
      Restart Animations
      <Button.Triggers>
        <EventTrigger RoutedEvent="Button.Click">
          <BeginStoryboard>
            <Storyboard>

              <!-- DoubleAnimation with IsAdditive set to "True". Because IsAdditive is set to "True" the 
                   actual starting value of the animation is equal to the sum of the default starting 
                   value of 100 (From="100)and the animation output value of 100 (From="100" To="200") Therefore
                   the animation begins at 200 pixels. Notice that each time the button is clicked and the 
                   animation is initiated, the animation starting value builds upon the preceeding ending value. -->
              <DoubleAnimation 
                Storyboard.TargetName="withIsAdditive" 
                Storyboard.TargetProperty="Width" 
                Duration="0:0:3" From="100" To="200" IsAdditive="True" />

              <!-- DoubleAnimation with IsAdditive set to "False". The starting value is the default starting
                   value of 100 pixels and subsequent animations do not build on earlier ones. -->
              <DoubleAnimation 
                Storyboard.TargetName="withoutIsAdditive" 
                Storyboard.TargetProperty="Width" 
                Duration="0:0:3" From="100" To="200" IsAdditive="False" />

              <!-- DoubleAnimationUsingKeyFrames with IsAdditive set to "True". Similar to the DoubleAnimation
                   above, this animation adds its output value to its starting value. Note that the output value
                   is the total output value from all the key frames for a total output of 100 pixels. -->
              <DoubleAnimationUsingKeyFrames
                 Storyboard.TargetName="withIsAdditiveUsingKeyFrames"
                 Storyboard.TargetProperty="Width"
                 IsAdditive="True" >
                <DoubleAnimationUsingKeyFrames.KeyFrames>
                  <LinearDoubleKeyFrame Value="100" KeyTime="0:0:0" />
                  <LinearDoubleKeyFrame Value="130" KeyTime="0:0:1" />
                  <SplineDoubleKeyFrame KeySpline="0.6,0.0 0.9,0.00" Value="200" KeyTime="0:0:3" />
                </DoubleAnimationUsingKeyFrames.KeyFrames>
              </DoubleAnimationUsingKeyFrames>

              <!-- DoubleAnimationUsingKeyFrames with IsAdditive set to "False". The starting value is the 
                   default starting value of 100 pixels and subsequent animations do not build on earlier ones. -->
              <DoubleAnimationUsingKeyFrames
                 Storyboard.TargetName="withoutIsAdditiveUsingKeyFrames"
                 Storyboard.TargetProperty="Width"
                 IsAdditive="False" >
                <DoubleAnimationUsingKeyFrames.KeyFrames>
                  <LinearDoubleKeyFrame Value="100" KeyTime="0:0:0" />
                  <LinearDoubleKeyFrame Value="130" KeyTime="0:0:1" />
                  <SplineDoubleKeyFrame KeySpline="0.6,0.0 0.9,0.00" Value="200" KeyTime="0:0:3" />
                </DoubleAnimationUsingKeyFrames.KeyFrames>
              </DoubleAnimationUsingKeyFrames>

            </Storyboard>

          </BeginStoryboard>
        </EventTrigger>
      </Button.Triggers>
    </Button>
  </StackPanel>
</Page>

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