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操作說明：使用 From、To 和 By 控制動畫

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"From/To/By" 或者「基本動畫」會在兩個目標值之間建立轉換 (如需不同類型動畫的簡介，請參閱動畫概觀)。 若要設定基本動畫的目標值，請使用其 From、To 和 By 屬性。 下表摘要說明如何搭配使用或分開使用 From、To 和 By 屬性，來判斷動畫的目標值。

指定的屬性 產生的行為
From 動畫會從 From 屬性所指定的值前進到要產生動畫之屬性的基底值，或者前進到上一個動畫的輸出值，而這取決於上一個動畫的設定方式。
From 和 To 動畫會從 From 屬性所指定的值前進到 To 屬性所指定的值。
From 和 By 動畫會從 From 屬性所指定的值前進到 From 與 By 屬性總和所指定的值。
To 動畫會從已產生動畫效果之屬性的基底值或上一個動畫的輸出值前進到 To 屬性所指定的值。
By 動畫會從要產生動畫之屬性的基底值或上一個動畫的輸出值前進到該值與 By 屬性所指定值的總和。

注意

請不要在相同的動畫上同時設定 To 屬性和 By 屬性。

若要使用其他插補方法，或建立兩個以上的目標值之間的動畫，請使用主要畫面格動畫。 如需詳細資訊，請參閱主要畫面格動畫概觀。

如需將多個動畫套用至單一屬性的相關資訊，請參閱主要畫面格動畫概觀。

下面的範例顯示在動畫上設定 To、By 和 From 屬性的不同效果。

範例

<!-- This example shows the different effects of setting
   To, By, and From properties on animations.  -->
<Page
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

  <StackPanel Margin="20">

    <!-- Demonstrates the From and To properties used together. -->
    <Rectangle Name="fromToAnimatedRectangle" Height="10" Width="100" 
      HorizontalAlignment="Left" Margin="10" Fill="#99FF9900" />

    <!-- Demonstrates the use of the To property. -->
    <Rectangle Name="toAnimatedRectangle" Height="10" Width="100" 
      HorizontalAlignment="Left" Margin="10" Fill="#99FF9900" />

    <!-- Demonstrates the use of the By property. -->
    <Rectangle Name="byAnimatedRectangle" Height="10" Width="100" 
      HorizontalAlignment="Left" Margin="10" Fill="#99FF9900" />

    <!-- Demonstrates the use of the From and By properties. -->
    <Rectangle Name="fromByAnimatedRectangle" Height="10" Width="100" 
      HorizontalAlignment="Left" Margin="10" Fill="#99FF9900" />

    <!-- Demonstrates the use of the From property. -->
    <Rectangle Name="fromAnimatedRectangle" Height="10" Width="100" 
      HorizontalAlignment="Left" Margin="10" Fill="#99FF9900" />
    <Button>
      Start Animations
      <Button.Triggers>
        <EventTrigger RoutedEvent="Button.Click">
          <BeginStoryboard>
            <Storyboard FillBehavior="Stop">

              <!-- Demonstrates the From and To properties used together.
                 Animates the rectangle's Width property from 50 to 300 over 10 seconds. -->
              <DoubleAnimation 
                Storyboard.TargetName="fromToAnimatedRectangle" 
                Storyboard.TargetProperty="(Rectangle.Width)"
                From="50" To="300" Duration="0:0:10" />

              <!-- Demonstrates the To property used by itself.
                 Animates the Rectangle's Width property from its base value
                 (100) to 300 over 10 seconds. -->
              <DoubleAnimation 
                Storyboard.TargetName="toAnimatedRectangle" Storyboard.TargetProperty="(Rectangle.Width)"
                To="300" Duration="0:0:10" />

              <!-- Demonstrates the By property used by itself.
                 Increments the Rectangle's Width property by 300 over 10 seconds.
                 As a result, the Width property is animated from its base value
                 (100) to 400 (100 + 300) over 10 seconds. -->
              <DoubleAnimation 
                Storyboard.TargetName="byAnimatedRectangle" Storyboard.TargetProperty="(Rectangle.Width)" 
                By="300" Duration="0:0:10" />

              <!-- Demonstrates the From and By properties used together.
                 Increments the Rectangle's Width property by 300 over 10 seconds.
                 As a result, the Width property is animated from 50
                 to 350 (50 + 300) over 10 seconds. -->
              <DoubleAnimation 
                Storyboard.TargetName="fromByAnimatedRectangle" Storyboard.TargetProperty="(Rectangle.Width)" 
                From="50" By="300" Duration="0:0:10"  />

              <!-- Demonstrates the From property used by itself.
                 Animates the rectangle's Width property from 50 to its base value (100)
                 over 10 seconds. -->
              <DoubleAnimation 
                Storyboard.TargetName="fromAnimatedRectangle" Storyboard.TargetProperty="(Rectangle.Width)"
                From="50" Duration="0:0:10"  />
            </Storyboard>
          </BeginStoryboard>
        </EventTrigger>
      </Button.Triggers>
    </Button>
  </StackPanel>
</Page>

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