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Comment : appliquer un effet à une partie d'image

Mise à jour : novembre 2007

Cet exemple montre comment appliquer un BitmapEffect à une partie d'une Image à l'aide de la propriété BitmapEffectInput.

Exemple

L'exemple suivant montre deux façons d'appliquer un effet à une partie du contenu visuel.

<Page xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml">
  <Page.Resources>
    <BitmapImage x:Key="sourceImage" UriSource="/images/WaterLilies.jpg"/>
  </Page.Resources>

  <StackPanel>
    <DockPanel>
      <StackPanel DockPanel.Dock="Left">
        <TextBlock>AreaToApplyEffect=".25,.25,.50,.50"</TextBlock>
        <TextBlock>AreaToApplyEffectUnits="RelativeToBoundingBox"</TextBlock>
      </StackPanel>
      <Image Width="360" Source="{StaticResource sourceImage}" Margin="10" DockPanel.Dock="Left">
        <Image.BitmapEffect>

          <!-- <BitmapEffectGroup> would go here if you wanted to apply more 
             then one effect to the TextBox. However, in this example only  
             one effect is being applied so BitmapEffectGroup does not need  
             to be included. -->

          <!-- Effect to Apply to the Image -->
          <EmbossBitmapEffect Relief="0.8" LightAngle="320" />
        </Image.BitmapEffect>
        <Image.BitmapEffectInput>

          <!-- BitmapEffectInput is used to apply the bitmap effect to a specified
                 region of the visual. When this property is not used, the effect
                 is applied to the entire visual.

               AreaToApplyEffect is a rectangular area in which to apply the effect.
               - When AreaToApplyEffectUnits is "Absolute", the rectangle is read as
                 pixel coordinates within the visual.
               - When AreaToApplyEffectUnits is "RelativeToBoundingBox",
                 the rectangle values are relative to the entire bounding box.
                 Values range between 0 and 1, where (0,0) is the top-left corner
                 and (1,1) is the bottom-right corner. -->

          <BitmapEffectInput AreaToApplyEffect=".25,.25,.50,.50" AreaToApplyEffectUnits="RelativeToBoundingBox"/>
        </Image.BitmapEffectInput>
      </Image>
    </DockPanel>
    <DockPanel>
      <StackPanel DockPanel.Dock="Left">
        <TextBlock>AreaToApplyEffect="90,66,180,135"</TextBlock>
        <TextBlock>AreaToApplyEffectUnits="Absolute"</TextBlock>
      </StackPanel>
      <Image Width="360" Source="{StaticResource sourceImage}" Margin="10" DockPanel.Dock="Left">
        <Image.BitmapEffect>

          <!-- <BitmapEffectGroup> would go here if you wanted to apply more 
             then one effect to the TextBox. However, in this example only  
             one effect is being applied so BitmapEffectGroup does not need  
             to be included. -->

          <!-- Effect to Apply to the Image -->
          <EmbossBitmapEffect Relief="0.8" LightAngle="320" />
        </Image.BitmapEffect>
        <Image.BitmapEffectInput>

          <!-- BitmapEffectInput is used to apply the bitmap effect to a specified
                 region of the visual. When this property is not used, the effect
                 is applied to the entire visual.

             AreaToApplyEffect is a rectangular area in which to apply the effect.
               - When AreaToApplyEffectUnits is "Absolute", the rectangle is read as
                 pixel coordinates within the visual.
               - When AreaToApplyEffectUnits is "RelativeToBoundingBox",
                 the rectangle values are relative to the entire bounding box.
                 Values range between 0 and 1, where (0,0) is the top-left corner
                 and (1,1) is the bottom-left corner. -->

          <BitmapEffectInput AreaToApplyEffect="90,66,180,135" AreaToApplyEffectUnits="Absolute"/>
        </Image.BitmapEffectInput>
      </Image>
    </DockPanel>
  </StackPanel>

</Page>

L'illustration suivante montre un effet de relief appliqué uniquement au milieu d'une image.

Effet de relief sur une partie d'une image.

Voir aussi

Référence

EmbossBitmapEffect