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Cómo: Agregar un valor de salida de animación a un valor inicial de animación

Actualización: noviembre 2007

Este ejemplo muestra cómo agregar un valor de salida de animación al valor inicial de una animación.

La propiedad IsAdditive especifica si desea que el valor de salida de una animación se agregue al valor inicial (valor base) de una propiedad animada. Puede usar la propiedad IsAdditive con la mayoría de las animaciones básicas y la mayoría de las animaciones de fotogramas clave. Para obtener más información, consulte Información general sobre animaciones y Información general sobre animaciones de fotogramas clave.

El ejemplo siguiente muestra el efecto de utilizar la propiedad DoubleAnimation.IsAdditive con DoubleAnimation y la propiedad DoubleAnimationUsingKeyFrames.IsAdditive con DoubleAnimationUsingKeyFrames.

<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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