PointAnimationUsingKeyFrames 类

定义

public ref class PointAnimationUsingKeyFrames sealed : Timeline

/// [Microsoft.UI.Xaml.Markup.ContentProperty(Name="KeyFrames")]
/// [Windows.Foundation.Metadata.Activatable(65536, "Microsoft.UI.Xaml.WinUIContract")]
/// [Windows.Foundation.Metadata.ContractVersion(Microsoft.UI.Xaml.WinUIContract, 65536)]
/// [Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
/// [Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
class PointAnimationUsingKeyFrames final : Timeline

[Microsoft.UI.Xaml.Markup.ContentProperty(Name="KeyFrames")]
[Windows.Foundation.Metadata.Activatable(65536, "Microsoft.UI.Xaml.WinUIContract")]
[Windows.Foundation.Metadata.ContractVersion(typeof(Microsoft.UI.Xaml.WinUIContract), 65536)]
[Windows.Foundation.Metadata.MarshalingBehavior(Windows.Foundation.Metadata.MarshalingType.Agile)]
[Windows.Foundation.Metadata.Threading(Windows.Foundation.Metadata.ThreadingModel.Both)]
public sealed class PointAnimationUsingKeyFrames : Timeline

Public NotInheritable Class PointAnimationUsingKeyFrames
Inherits Timeline

<PointAnimationUsingKeyFrames>
  oneOrMorePointKeyFrames
</PointAnimationUsingKeyFrames>

继承

Object Platform::Object IInspectable DependencyObject Timeline PointAnimationUsingKeyFrames

属性

ContentPropertyAttribute ActivatableAttribute ContractVersionAttribute MarshalingBehaviorAttribute ThreadingAttribute

示例

以下示例沿三角形路径移动椭圆形。 该示例使用 PointAnimationUsingKeyFrames 类对 EllipseGeometry 的 Center 属性进行动画处理。 此动画按以下方式使用三个关键帧：

1. 在上半秒，它使用 LinearPointKeyFrame 类的实例沿路径以稳定速率从其起始位置移动椭圆。 线性关键帧（如 LinearPointKeyFrame） 在值之间创建平滑的线性内插。
2. 在下半秒结束时，它使用 DiscretePointKeyFrame 类的实例突然将椭圆沿路径移动到下一个位置。 离散关键帧（如 DiscretePointKeyFrame） 会在值之间创建突然跳转。
3. 在最后两秒内，它使用 SplinePointKeyFrame 类的实例将椭圆移回其起始位置。 SplinePointKeyFrame 等样条关键帧根据 KeySpline 属性的值在值之间创建可变转换。 在此示例中，动画开始时较为缓慢，然后以指数方式加速，直到时间段结束。

<Canvas Width="400" Height="300">
    <Canvas.Resources>
        <Storyboard x:Name="myStoryboard">

            <!-- Animating the Center property uses 3 KeyFrames, which animate
             the ellipse allong a triangular path. -->
            <PointAnimationUsingKeyFrames
          Storyboard.TargetProperty="Center"
          Storyboard.TargetName="MyAnimatedEllipseGeometry"
          Duration="0:0:5" RepeatBehavior="Forever" EnableDependentAnimation="True">

                <!-- Over the first half second, Using a LinearPointKeyFrame, the ellipse 
               moves steadily from its starting position along the first line of the 
               trianglar path.  -->
                <LinearPointKeyFrame KeyTime="0:0:0.5" Value="100,300" />

                <!-- Using a DiscretePointKeyFrame, the ellipse suddenly changes position
               after the first second of the animation. -->
                <DiscretePointKeyFrame KeyTime="0:0:1" Value="400,300" />

                <!-- Using a SplinePointKeyFrame, the ellipse moves back to its starting
               position. It moves slowly at first and then speeds up. This key frame 
               takes 2 seconds to complete. -->
                <SplinePointKeyFrame KeySpline="0.6,0.0 0.9,0.00" 
                 KeyTime="0:0:3" Value="200,100" />
            </PointAnimationUsingKeyFrames>
        </Storyboard>
    </Canvas.Resources>
    <Path Fill="Blue" Loaded="Start_Animation">
        <Path.Data>

            <!-- Describes an ellipse. -->
            <EllipseGeometry x:Name="MyAnimatedEllipseGeometry"
             Center="200,100" RadiusX="15" RadiusY="15" />
        </Path.Data>
    </Path>
</Canvas>

// Start the animation when the object loads
private void Start_Animation(object sender, RoutedEventArgs e)
{
    myStoryboard.Begin();
}

构造函数

属性

方法

事件

适用于

另请参阅

• 情节提要动画