如何为剪切路径设置动画

Question

我正在尝试为剪切路径设置动画。我读自 Silverlight 中的蒙版动画（剪切路径动画）无需一行代码，我应该首先对剪切路径进行动画处理，因此

Data=”M159.67175,104.26108 L177.91812,28.328932 L195.51648,104.43327 L255.0802,102.6104 L206.86984,151.82758 L225.8029,226.56477 L179.0616,179.17046 L129.73396,229.29906 L147.97842,150.63879 L98.650803,101.53297 z”

将更改为，

<Path.Data>
<PathGeometry>
    <PathFigure IsClosed=”True” StartPoint=”91.0527648925781,84.0121078491211?>
        <LineSegment Point=”118.057907104492,0.549586236476898?/>
        <LineSegment Point=”144.103973388672,84.2013778686523?/>
        <LineSegment Point=”232.259979248047,82.1977386474609?/>
        <LineSegment Point=”160.907287597656,136.2958984375?/>
        <LineSegment Point=”188.928756713867,218.444961547852?/>
        <LineSegment Point=”119.750289916992,166.350433349609?/>
        <LineSegment Point=”46.7439804077148,221.450408935547?/>
        <LineSegment Point=”73.7462997436523,134.989212036133?/>
        <LineSegment Point=”0.740016639232636,81.0134506225586?/>
    </PathFigure>
</PathGeometry>
</Path.Data>

但在对路径进行动画处理后，我的 XAML 仍然看起来像

<Path x:Name="path" Data="M0.5,0.5 L84.5,0.5 L84.5,150.5 L0.5,150.5 z" HorizontalAlignment="Left" Height="151" Margin="76,55,0,0" Stretch="Fill" Stroke="{x:Null}" VerticalAlignment="Top" Width="85" Fill="Black" RenderTransformOrigin="0.5,0.5">
    <Path.RenderTransform>
        <TransformGroup>
            <ScaleTransform/>
            <SkewTransform/>
            <RotateTransform/>
            <TranslateTransform/>
        </TransformGroup>
    </Path.RenderTransform>
</Path>

一个短视频关于问题 http://screenr.com/1Wc

Answer 1

您需要在制作动画之前创建剪切路径。
然后，使用直接选择工具（Blend 4 中工具栏上的第二个向下箭头）选择剪切路径。在记录时间线时移动剪辑路径将导致剪辑按照您期望的方式进行动画处理。

这是来自两个矩形的 XAML - 一个具有线性渐变的大矩形，另一个是剪切路径的较小矩形。剪切矩形是动画的并且遵循渐变。

<UserControl
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
x:Class="WpfSplash.TemplatePanel"
x:Name="UserControl" Height="1000" Width="544">
<UserControl.Resources>
    <Storyboard x:Key="OnLoaded1">
        <PointAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Clip).(PathGeometry.Figures)[0].(PathFigure.Segments)[1].(LineSegment.Point)" Storyboard.TargetName="rectangle">
            <EasingPointKeyFrame KeyTime="0:0:1" Value="495,184.5"/>
        </PointAnimationUsingKeyFrames>
        <PointAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Clip).(PathGeometry.Figures)[0].(PathFigure.Segments)[2].(LineSegment.Point)" Storyboard.TargetName="rectangle">
            <EasingPointKeyFrame KeyTime="0:0:1" Value="-14.9999999999998,184.5"/>
        </PointAnimationUsingKeyFrames>
        <PointAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Clip).(PathGeometry.Figures)[0].(PathFigure.StartPoint)" Storyboard.TargetName="rectangle">
            <EasingPointKeyFrame KeyTime="0:0:1" Value="-14.9999999999998,142.5"/>
        </PointAnimationUsingKeyFrames>
        <PointAnimationUsingKeyFrames Storyboard.TargetProperty="(UIElement.Clip).(PathGeometry.Figures)[0].(PathFigure.Segments)[0].(LineSegment.Point)" Storyboard.TargetName="rectangle">
            <EasingPointKeyFrame KeyTime="0:0:1" Value="495,142.5"/>
        </PointAnimationUsingKeyFrames>
    </Storyboard>
</UserControl.Resources>
<UserControl.Triggers>
    <EventTrigger RoutedEvent="FrameworkElement.Loaded">
        <BeginStoryboard Storyboard="{StaticResource OnLoaded1}"/>
    </EventTrigger>
</UserControl.Triggers>

<Canvas x:Name="LayoutRoot">
    <Rectangle x:Name="rectangle" Height="207" Canvas.Left="33" Canvas.Top="106.5" Width="481.5">
        <Rectangle.Clip>
            <PathGeometry>
                <PathFigure IsClosed="True" StartPoint="-15,16.5">
                    <LineSegment Point="495,16.5"/>
                    <LineSegment Point="495,54"/>
                    <LineSegment Point="-15,54"/>
                </PathFigure>
            </PathGeometry>
        </Rectangle.Clip>
        <Rectangle.Fill>
            <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                <GradientStop Color="#FFD6904A" Offset="1"/>
                <GradientStop Color="#FFEBD8FF"/>
            </LinearGradientBrush>
        </Rectangle.Fill>
    </Rectangle>
</Canvas>