Procedura: applicare un effetto a parte di un'immagine

Aggiornamento: novembre 2007

In questo esempio viene illustrato come applicare BitmapEffect a una parte di Image utilizzando la proprietà BitmapEffectInput.

Esempio

Nell'esempio riportato di seguito vengono illustrate due modalità per applicare un effetto a una parte del contenuto visivo.

<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>

Nell'illustrazione riportata di seguito è visibile un effetto di rilievo applicato solo alla parte centrale di un'immagine.

Vedere anche

Riferimenti

EmbossBitmapEffect