Comment : ajouter une valeur de sortie d'animation à une valeur de départ d'animation
Mise à jour : novembre 2007
Cet exemple indique comment ajouter une valeur de sortie d'animation à une valeur de départ d'animation.
Exemple
La propriété IsAdditive spécifie si vous souhaitez que la valeur de sortie d'une animation soit ajoutée à la valeur de départ (valeur de base) d'une propriété animée. Vous pouvez utiliser la propriété IsAdditive avec la plupart des animations de base et des animations d'image clé. Pour plus d'informations, consultez Vue d'ensemble de l'animation et Vue d'ensemble des animations d'image clé.
L'exemple suivant montre l'effet de l'utilisation de la propriété DoubleAnimation.IsAdditive avec DoubleAnimation et l'effet de l'utilisation de la propriété DoubleAnimationUsingKeyFrames.IsAdditive avec DoubleAnimationUsingKeyFrames.
<Page xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://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>
Voir aussi
Tâches
Comment : accumuler des valeurs d'animation pendant des cycles de répétition
Concepts
Vue d'ensemble des animations d'image clé