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Cara: Mengakumulasi Nilai Animasi Selama Siklus Berulang

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Contoh ini menunjukkan cara menggunakan IsCumulative properti untuk mengakumulasi nilai animasi di seluruh siklus berulang.

Contoh

IsCumulative Gunakan properti untuk mengakumulasi nilai dasar animasi di seluruh siklus berulang. Misalnya, jika Anda mengatur animasi untuk diulang 9 kali (RepeatBehavior = "9x") dan Anda mengatur properti untuk menganimasikan antara 10 dan 15 (Dari = 10 Hingga = 15), properti menganimasikan dari 10 hingga 15 selama siklus pertama, dari 15 hingga 20 selama siklus kedua, dari 20 hingga 25 selama siklus ketiga, dan sebagainya. Oleh karena itu, setiap siklus animasi menggunakan nilai animasi akhir dari siklus animasi sebelumnya sebagai nilai dasarnya.

Anda dapat menggunakan IsCumulative properti dengan sebagian besar animasi dasar dan sebagian besar animasi bingkai kunci. Untuk informasi selengkapnya, lihat Gambaran Umum Animasi dan Gambaran Umum Animasi Bingkai Kunci.

Contoh berikut menunjukkan perilaku ini dengan menganimasikan lebar empat persegi panjang. Contohnya:

<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 IsCumulative set to "True". -->
    <Rectangle Name="withIsCumulative"
      Width="100" Height="20" Margin="12,0,0,5" Fill="#AA3333FF" HorizontalAlignment="Left" />

    <!-- This rectangle is animated with DoubleAnimation and IsCumulative set to "False". -->
    <Rectangle Name="withoutIsCumulative"
      Width="100" Height="20" Margin="12,0,0,5" Fill="#AA3333FF" HorizontalAlignment="Left" />

    <!-- This rectangle is animated with DoubleAnimationUsingKeyFrames and IsCumulative set to "True". -->
    <Rectangle Name="withIsCumulativeUsingKeyFrames"
      Width="100" Height="20" Margin="12,0,0,5" Fill="#AA3333FF" HorizontalAlignment="Left" />

    <!-- This rectangle is animated with DoubleAnimationUsingKeyFrames and IsCumulative set to "False". -->
    <Rectangle Name="withoutIsCumulativeUsingKeyFrames"
      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 IsCumulative set to "True". Because IsCumulative is set to "True", 
                   the base values of the animation will accumulate over repeat cycles. In this example, the
                   first iteration will be from 100 to 200, the second will be from 200 to 300, the third from
                   300 to 400, etc. -->
              <DoubleAnimation 
                Storyboard.TargetName="withIsCumulative" 
                Storyboard.TargetProperty="Width" 
                RepeatBehavior="4x"
                AutoReverse="True"
                IsCumulative="True"
                Duration="0:0:3" From="100" To="200" />

              <!-- DoubleAnimation with IsCumulative set to "False". The starting value 100 pixels and repeat 
                   cycles do not build on earlier ones. -->
              <DoubleAnimation 
                Storyboard.TargetName="withoutIsCumulative" 
                Storyboard.TargetProperty="Width" 
                RepeatBehavior="4x"
                AutoReverse="True"
                IsCumulative="False"
                Duration="0:0:3" From="100" To="200" />

              <!-- DoubleAnimationUsingKeyFrames with IsCumulative set to "True". Similar to the DoubleAnimation
                   above, the base value of each cycle builds on the last one. 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="withIsCumulativeUsingKeyFrames"
                Storyboard.TargetProperty="Width"
                RepeatBehavior="4x"
                AutoReverse="True"
                IsCumulative="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 IsCumulative set to "False". The base value of each cycle
                   does not build on the last one. -->
              <DoubleAnimationUsingKeyFrames
                Storyboard.TargetName="withoutIsCumulativeUsingKeyFrames"
                Storyboard.TargetProperty="Width"
                RepeatBehavior="4x"
                AutoReverse="True"
                IsCumulative="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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