MatrixAnimationUsingPath.IsAngleCumulative 属性

public:
 property bool IsAngleCumulative { bool get(); void set(bool value); };

public bool IsAngleCumulative { get; set; }

member this.IsAngleCumulative : bool with get, set

Public Property IsAngleCumulative As Boolean

属性值

true 如果动画的旋转角度应累积重复，则为否则，为 false. 默认值为 false。

示例

以下示例使用两个类似的 MatrixAnimationUsingPath 动画对同一矩形进行动画处理。 这两个动画具有相同 PathGeometry 的设置，这会导致矩形在屏幕向右移动时旋转，并且两个动画都设置为重复四次。 第一个动画 IsAngleCumulative 的属性设置为 false，因此当动画重复时，矩形会跳回其原始角度。 第二个动画 IsAngleCumulative 的属性设置为 true;因此，当动画重复时，矩形角度似乎会增加，而不是跳回其原始值。

<Page 
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" >
  <StackPanel Margin="50">
      
    <!-- The Rectangle that is animated across the screen by animating
         the MatrixTransform applied to the button. -->
    <Rectangle 
      Width="75" Height="25"
      HorizontalAlignment="Left"
      VerticalAlignment="Top"
      Stroke="Black" StrokeThickness="1">
      <Rectangle.RenderTransform>
        <MatrixTransform x:Name="myMatrixTransform">
          <MatrixTransform.Matrix >
            <Matrix OffsetX="10" OffsetY="100"/>
          </MatrixTransform.Matrix>
        </MatrixTransform>
      </Rectangle.RenderTransform>
      <Rectangle.Fill>
        <LinearGradientBrush>
          <GradientStop Color="Lime" Offset="0.0" />
          <GradientStop Color="Gray" Offset="1.0" />
        </LinearGradientBrush>
      </Rectangle.Fill>
    </Rectangle>

    <!-- Shows the animation path. -->
    <Path
      Stroke="Black" StrokeThickness="5"
      Data="M 0,0 A 50,50 0 1 0 100,0" />
    
    <StackPanel Margin="0,200,0,0" Orientation="Horizontal">
    <Button Content="Animate with IsAngleCumulative set to False"
      HorizontalAlignment="Left" Padding="5">
      <Button.Triggers>
        <EventTrigger RoutedEvent="Button.Click">
          <BeginStoryboard>
            <Storyboard>

              <!-- The angle generated by this animation does not
                   accumulate over repetitions. As a result, 
                   the rectangle appears to jump back to its 
                   starting angle when the animation repeats.  -->
              <MatrixAnimationUsingPath
                Storyboard.TargetName="myMatrixTransform"
                Storyboard.TargetProperty="Matrix"
                Duration="0:0:2" 
                RepeatBehavior="4x" 
                IsOffsetCumulative="True" 
                IsAngleCumulative="False"
                DoesRotateWithTangent="True">
                <MatrixAnimationUsingPath.PathGeometry>
                  <PathGeometry Figures="M 0,0 A 50,50 0 1 0 100,0" />
                </MatrixAnimationUsingPath.PathGeometry>
              </MatrixAnimationUsingPath>
            </Storyboard>
          </BeginStoryboard>
        </EventTrigger>
      </Button.Triggers>   
    </Button>
    
     <Button Content="Animate with IsAngleCumulative set to True"
      HorizontalAlignment="Left" 
      Padding="5">
      <Button.Triggers>
        <EventTrigger RoutedEvent="Button.Click">
          <BeginStoryboard>
            <Storyboard>
            
              <!-- The angle generated by this animation accumulates
                   over repetitions. As a result, the rectangle's
                   rotation appears seamless.  -->
              <MatrixAnimationUsingPath
                Storyboard.TargetName="myMatrixTransform"
                Storyboard.TargetProperty="Matrix"
                Duration="0:0:2" 
                RepeatBehavior="4x" 
                IsOffsetCumulative="True" 
                IsAngleCumulative="True"
                DoesRotateWithTangent="True">
                <MatrixAnimationUsingPath.PathGeometry>
                  <PathGeometry Figures="M 0,0 A 50,50 0 1 0 100,0" />
                </MatrixAnimationUsingPath.PathGeometry>
              </MatrixAnimationUsingPath>
            </Storyboard>
          </BeginStoryboard>
        </EventTrigger>
      </Button.Triggers>   
    </Button>   
    </StackPanel>
    
    
  </StackPanel>
</Page>

注解

如果此属性设置为 true，动画矩阵的旋转角度将随着动画重复而累积。 如果路径是一个小弧线，累积角度将导致对象每次重复旋转，而不是重启旋转。 当与其中一个IsOffsetCumulativetrue组合时，你的对象在弹跳时可能会下降（具体取决于你指定的路径）。 有关相关信息，请参阅 IsOffsetCumulative。

如果为 false，则设置此属性不起作用DoesRotateWithTangent。

此属性确定动画矩阵的角度在动画因 RepeatBehavior 设置而重复时是否累积;它不会导致动画重启时偏移量累积。 有关如何使动画生成之前动画的值的信息，请参阅 IsAdditive。

Dependency 属性信息

另请参阅

• DoesRotateWithTangent
• IsOffsetCumulative