用Shape做动画实例代码
16lz
2021-01-22
相对于WPF/Silverlight，UWP的动画系统可以说有大幅提高，不过本文无意深入讨论这些动画API，本文将介绍使用Shape做一些进度、等待方面的动画，除此之外也会介绍一些相关技巧。
1. 使用StrokeDashOffset做等待提示动画
圆形的等待提示动画十分容易做，只要让它旋转就可以了：
但是圆形以外的形状就不容易做了，例如三角形，总不能让它单纯地旋转吧：
要解决这个问题可以使用StrokeDashOffset。StrokeDashOffset用于控制虚线边框的第一个短线相对于Shape开始点的位移，使用动画控制这个数值可以做出边框滚动的效果：
<Page.Resources><Storyboard x:Name="ProgressStoryboard"><DoubleAnimationUsingKeyFrames EnableDependentAnimation="True" Storyboard.TargetProperty="(Shape.StrokeDashOffset)" Storyboard.TargetName="triangle"><EasingDoubleKeyFrame KeyTime="0:1:0" Value="-500" /></DoubleAnimationUsingKeyFrames></Storyboard></Page.Resources><Grid Background="#FFCCCCCC"><Grid Height="100" HorizontalAlignment="Center"><StackPanel Orientation="Horizontal" VerticalAlignment="Center"><TextBlock Text="L" FontSize="55" Margin="0,0,5,4" /><local:Triangle x:Name="triangle" Height="40" Width="40" StrokeThickness="2" Stroke="RoyalBlue" StrokeDashArray="4.045 4.045" StrokeDashOffset="0.05" StrokeDashCap="Round" /><TextBlock Text="ading..." FontSize="55" Margin="5,0,0,4" /></StackPanel></Grid></Grid>
需要注意的是Shape的边长要正好能被StrokeDashArray中短线和缺口的和整除，即 满足边长 / StrokeThickness % Sum( StrokeDashArray ) = 0，这是因为在StrokeDashOffset=0的地方会截断短线，如下图所示：
另外注意的是边长的计算，如Rectangle，边长并不是(Height + Width) * 2，而是(Height - StrokeThickness) * 2 + (Width- StrokeThickness) * 2，如下图所示，边长应该从边框正中间开始计算：
有一些Shape的边长计算还会受到Stretch影响，如上一篇中自定义的Triangle：
<StackPanel Orientation="Horizontal" HorizontalAlignment="Center"><Grid Height="50" Width="50"><local:Triangle Stretch="Fill" StrokeThickness="5" Stroke="RoyalBlue" /></Grid><Grid Height="50" Width="50" Margin="10,0,0,0"><local:Triangle Stretch="None" StrokeThickness="5" Stroke="RoyalBlue" /></Grid></StackPanel>
2. 使用StrokeDashArray做进度提示动画
StrokeDashArray用于将Shape的边框变成虚线，StrokeDashArray的值是一个double类型的有序集合，里面的数值指定虚线中每一段以StrokeThickness为单位的长度。用StrokeDashArray做进度提示的基本做法就是将进度Progress通过Converter转换为分成两段的StrokeDashArray，第一段为实线，表示当前进度，第二段为空白。假设一个Shape的边长是100，当前进度为50，则将StrokeDashArray设置成{50，double.MaxValue}两段。
做成动画如下图所示：
<Page.Resources><Style TargetType="TextBlock"><Setter Property="FontSize" Value="12" /></Style><local:ProgressToStrokeDashArrayConverter x:Key="ProgressToStrokeDashArrayConverter" TargetPath="{Binding ElementName=Triangle}" /><local:ProgressToStrokeDashArrayConverter2 x:Key="ProgressToStrokeDashArrayConverter2" TargetPath="{Binding ElementName=Triangle}" /><toolkit:StringFormatConverter x:Key="StringFormatConverter" /><local:ProgressWrapper x:Name="ProgressWrapper" /><Storyboard x:Name="Storyboard1"><DoubleAnimation Duration="0:0:5" To="100" Storyboard.TargetProperty="Progress" Storyboard.TargetName="ProgressWrapper" EnableDependentAnimation="True" /></Storyboard></Page.Resources><Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"><Viewbox Height="150"><StackPanel Orientation="Horizontal"><Grid><local:Triangle Height="40" Width="40" StrokeThickness="2" Stroke="DarkGray" /><local:Triangle x:Name="Triangle" Height="40" Width="40" StrokeThickness="2" Stroke="RoyalBlue" StrokeDashArray="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource ProgressToStrokeDashArrayConverter}}" /><TextBlock Text="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource StringFormatConverter},ConverterParameter='{}{0:0}'}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,15,0,0" /></Grid><Grid Margin="20,0,0,0"><local:Triangle Height="40" Width="40" StrokeThickness="2" Stroke="DarkGray" /><local:Triangle x:Name="Triangle2" Height="40" Width="40" StrokeThickness="2" Stroke="RoyalBlue" StrokeDashArray="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource ProgressToStrokeDashArrayConverter2}}" /><TextBlock Text="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource StringFormatConverter},ConverterParameter='{}{0:0}'}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,15,0,0" /></Grid></StackPanel></Viewbox></Grid>其中ProgressToStrokeDashArrayConverter和ProgressToStrokeDashArrayConverter2的代码如下：
public class ProgressToStrokeDashArrayConverter : DependencyObject, IValueConverter{/// <summary>/// 获取或设置TargetPath的值/// </summary> public Path TargetPath { get { return (Path)GetValue(TargetPathProperty); } set { SetValue(TargetPathProperty, value); } }/// <summary>/// 标识 TargetPath 依赖属性。/// </summary>public static readonly DependencyProperty TargetPathProperty = DependencyProperty.Register("TargetPath", typeof(Path), typeof(ProgressToStrokeDashArrayConverter), new PropertyMetadata(null));public virtual object Convert(object value, Type targetType, object parameter, string language) { if (value is double == false)return null; var progress = (double)value;if (TargetPath == null)return null;var totalLength = GetTotalLength(); var firstSection = progress * totalLength / 100 / TargetPath.StrokeThickness;if (progress == 100) firstSection = Math.Ceiling(firstSection);var result = new DoubleCollection { firstSection, double.MaxValue };return result; }public object ConvertBack(object value, Type targetType, object parameter, string language) {throw new NotImplementedException(); }protected double GetTotalLength() {var geometry = TargetPath.Data as PathGeometry; if (geometry == null) return 0; if (geometry.Figures.Any() == false)return 0; var figure = geometry.Figures.FirstOrDefault(); if (figure == null) return 0; var totalLength = 0d; var point = figure.StartPoint; foreach (var item in figure.Segments) { var segment = item as LineSegment; if (segment == null) return 0; totalLength += Math.Sqrt(Math.Pow(point.X - segment.Point.X, 2) + Math.Pow(point.Y - segment.Point.Y, 2)); point = segment.Point; } totalLength += Math.Sqrt(Math.Pow(point.X - figure.StartPoint.X, 2) + Math.Pow(point.Y - figure.StartPoint.Y, 2)); return totalLength; }}public class ProgressToStrokeDashArrayConverter2 : ProgressToStrokeDashArrayConverter{public override object Convert(object value, Type targetType, object parameter, string language) { if (value is double == false)return null; var progress = (double)value; if (TargetPath == null) return null; var totalLength = GetTotalLength(); totalLength = totalLength / TargetPath.StrokeThickness; var thirdSection = progress * totalLength / 100; if (progress == 100) thirdSection = Math.Ceiling(thirdSection); var secondSection = (totalLength - thirdSection) / 2; var result = new DoubleCollection { 0, secondSection, thirdSection, double.MaxValue }; return result; }}由于代码只是用于演示，protected double GetTotalLength()写得比较将就。可以看到这两个Converter继承自DependencyObject，这是因为这里需要通过绑定为TargetPath赋值。
这里还有另一个类ProgressWrapper：
public class ProgressWrapper : DependencyObject{/// <summary>/// 获取或设置Progress的值/// </summary> public double Progress {get { return (double)GetValue(ProgressProperty); }set { SetValue(ProgressProperty, value); } }/// <summary>/// 标识 Progress 依赖属性。/// </summary>public static readonly DependencyProperty ProgressProperty = DependencyProperty.Register("Progress", typeof(double), typeof(ProgressWrapper), new PropertyMetadata(0d));}因为这里没有可供Storyboard操作的double属性，所以用这个类充当Storyboard和StrokeDashArray的桥梁。UWPCommunityToolkit中也有一个差不多用法的类BindableValueHolder，这个类通用性比较强，可以参考它的用法。
3. 使用Behavior改进进度提示动画代码
只是做个动画而已，又是Converter，又是Wrapper，又是Binding，看起来十分复杂，如果Shape上面有Progress属性就方便多了。这时候首先会考虑附加属性，在XAML用法如下：
<UserControl.Resources> <Storyboard x:Name="Storyboard1"><DoubleAnimation Duration="0:0:5" To="100" Storyboard.TargetProperty="(local:PathExtention.Progress)" Storyboard.TargetName="Triangle" /> </Storyboard></UserControl.Resources><Grid x:Name="LayoutRoot" Background="White"><local:Triangle x:Name="Triangle" Height="40" local:PathExtention.Progress="0" Width="40" StrokeThickness="2" Stroke="RoyalBlue" ></local:Triangle></Grid>
但其实这是行不通的，XAML有一个存在了很久的限制：However, an existing limitation of the Windows Runtime XAML implementation is that you cannot animate a custom attached property.。这个限制决定了XAML不能对自定义附加属性做动画。不过，这个限制只限制了不能对自定义附加属性本身做动画，但对附加属性中的类的属性则可以，例如以下这种写法应该是行得通的：
<UserControl.Resources> <Storyboard x:Name="Storyboard1"><DoubleAnimation Duration="0:0:5" To="100" Storyboard.TargetProperty="(local:PathExtention.Progress)" Storyboard.TargetName="TrianglePathExtention" /> </Storyboard></UserControl.Resources><Grid x:Name="LayoutRoot" Background="White"><local:Triangle x:Name="Triangle" Height="40" Width="40" StrokeThickness="2" Stroke="RoyalBlue" > <local:PathHelper><local:PathExtention x:Name="TrianglePathExtention" Progress="0" /> </local:PathHelper></local:Triangle></Grid>
更优雅的写法是利用XamlBehaviors，这篇文章很好地解释了XamlBehaviors的作用：
XAML Behaviors非常重要，因为它们提供了一种方法，让开发人员能够以一种简洁、可重复的方式轻松地向UI对象添加功能。他们无需创建控件的子类或重复编写逻辑代码，只要简单地增加一个XAML代码片段。
要使用Behavior改进现有代码，只需实现一个PathProgressBehavior：
public class PathProgressBehavior : Behavior<UIElement>{protected override void OnAttached() {base.OnAttached();UpdateStrokeDashArray(); }/// <summary>/// 获取或设置Progress的值/// </summary> public double Progress {get { return (double)GetValue(ProgressProperty); }set { SetValue(ProgressProperty, value); } }/*Progress DependencyProperty*/protected virtual void OnProgressChanged(double oldValue, double newValue) {UpdateStrokeDashArray(); }protected virtual double GetTotalLength(Path path) {/*some code*/}private void UpdateStrokeDashArray() { var target = AssociatedObject as Path;if (target == null)return;double progress = Progress; //if (target.ActualHeight == 0 || target.ActualWidth == 0)// return; if (target.StrokeThickness == 0) return; var totalLength = GetTotalLength(target); var firstSection = progress * totalLength / 100 / target.StrokeThickness; if (progress == 100) firstSection = Math.Ceiling(firstSection); var result = new DoubleCollection { firstSection, double.MaxValue }; target.StrokeDashArray = result; }}XAML中如下使用：
<UserControl.Resources> <Storyboard x:Name="Storyboard1"><DoubleAnimation Duration="0:0:5" To="100" Storyboard.TargetProperty="Progress" Storyboard.TargetName="PathProgressBehavior" EnableDependentAnimation="True"/> </Storyboard></UserControl.Resources><Grid x:Name="LayoutRoot" Background="White"> <local:Triangle x:Name="Triangle" Height="40" local:PathExtention.Progress="0" Width="40" StrokeThickness="2" Stroke="RoyalBlue" ><interactivity:Interaction.Behaviors> <local:PathProgressBehavior x:Name="PathProgressBehavior" /></interactivity:Interaction.Behaviors> </local:Triangle></Grid>
这样看起来就清爽多了。
4. 模仿背景填充动画
先看看效果：
其实这篇文章里并不会讨论填充动画，不过首先声明做填充动画会更方便快捷，这一段只是深入学习过程中的产物，实用价值不高。
上图三角形的填充的效果只需要叠加两个同样大小的Shape，前面那个设置Stretch="Uniform"，再通过DoubleAnimation改变它的高度就可以了。文字也是相同的原理，叠加两个相同的TextBlock，将前面那个放在一个无边框的ScrollViewer里再去改变ScrollViewer的高度。
<Page.Resources><Style TargetType="TextBlock"><Setter Property="FontSize" Value="12" /></Style><local:ProgressToHeightConverter x:Key="ProgressToHeightConverter" TargetContentControl="{Binding ElementName=ContentControl}" /><local:ReverseProgressToHeightConverter x:Key="ReverseProgressToHeightConverter" TargetContentControl="{Binding ElementName=ContentControl2}" /><toolkit:StringFormatConverter x:Key="StringFormatConverter" /><local:ProgressWrapper x:Name="ProgressWrapper" /><Storyboard x:Name="Storyboard1"><DoubleAnimation Duration="0:0:5" To="100" Storyboard.TargetProperty="Progress" Storyboard.TargetName="ProgressWrapper" EnableDependentAnimation="True" /></Storyboard></Page.Resources><Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}"><Grid><local:Triangle Height="40" Width="40" StrokeThickness="2" Fill="LightGray" /><local:Triangle Height="40" Width="40" Stretch="Fill" StrokeThickness="2" Stroke="RoyalBlue" /><ContentControl x:Name="ContentControl" VerticalAlignment="Bottom" HorizontalAlignment="Center" Height="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource ProgressToHeightConverter}}"><local:Triangle x:Name="Triangle3" Height="40" Width="40" StrokeThickness="2" Fill="RoyalBlue" Stretch="Uniform" VerticalAlignment="Bottom" /></ContentControl><TextBlock Text="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource StringFormatConverter},ConverterParameter='{}{0:0}'}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,12,0,0" Foreground="White" /><ContentControl x:Name="ContentControl2" Height="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource ReverseProgressToHeightConverter}}" VerticalAlignment="Top" HorizontalAlignment="Center"><ScrollViewer BorderThickness="0" Padding="0,0,0,0" VerticalScrollBarVisibility="Disabled" HorizontalScrollBarVisibility="Disabled" VerticalAlignment="Top" Height="40"><Grid Height="40"><TextBlock Text="{Binding Progress,Source={StaticResource ProgressWrapper},Converter={StaticResource StringFormatConverter},ConverterParameter='{}{0:0}'}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,12,0,0" /></Grid></ScrollViewer></ContentControl></Grid></Grid>ProgressToHeightConverter和ReverseProgressToHeightConverter的代码如下：
public class ProgressToHeightConverter : DependencyObject, IValueConverter{/// <summary>/// 获取或设置TargetContentControl的值/// </summary> public ContentControl TargetContentControl { get { return (ContentControl)GetValue(TargetContentControlProperty); } set { SetValue(TargetContentControlProperty, value); } }/// <summary>/// 标识 TargetContentControl 依赖属性。/// </summary>public static readonly DependencyProperty TargetContentControlProperty = DependencyProperty.Register("TargetContentControl", typeof(ContentControl), typeof(ProgressToHeightConverter), new PropertyMetadata(null)); public object Convert(object value, Type targetType, object parameter, string language) { if (value is double == false) return 0d; var progress = (double)value; if (TargetContentControl == null) return 0d; var element = TargetContentControl.Content as FrameworkElement; if (element == null) return 0d;return element.Height * progress / 100; }public object ConvertBack(object value, Type targetType, object parameter, string language) {throw new NotImplementedException(); } }public class ReverseProgressToHeightConverter : DependencyObject, IValueConverter{/// <summary>/// 获取或设置TargetContentControl的值/// </summary> public ContentControl TargetContentControl { get { return (ContentControl)GetValue(TargetContentControlProperty); } set { SetValue(TargetContentControlProperty, value); } }/// <summary>/// 标识 TargetContentControl 依赖属性。/// </summary>public static readonly DependencyProperty TargetContentControlProperty = DependencyProperty.Register("TargetContentControl", typeof(ContentControl), typeof(ReverseProgressToHeightConverter), new PropertyMetadata(null)); public object Convert(object value, Type targetType, object parameter, string language) { if (value is double == false) return double.NaN; var progress = (double)value;if (TargetContentControl == null)return double.NaN; var element = TargetContentControl.Content as FrameworkElement; if (element == null)return double.NaN; return element.Height * (100 - progress) / 100; } public object ConvertBack(object value, Type targetType, object parameter, string language) { throw new NotImplementedException(); }}再提醒一次，实际上老老实实做填充动画好像更方便些。
5. 将动画应用到Button的ControlTemplate
同样的技术，配合ControlTemplate可以制作很有趣的按钮：
PointerEntered时，按钮的边框从进入点向反方向延伸。PointerExited时，边框从反方向向移出点消退。要做到这点需要在PointerEntered时改变边框的方向，使用了ChangeAngleToEnterPointerBehavior：
public class ChangeAngleToEnterPointerBehavior : Behavior<Ellipse>{protected override void OnAttached() {base.OnAttached(); AssociatedObject.PointerEntered += OnAssociatedObjectPointerEntered; AssociatedObject.PointerExited += OnAssociatedObjectPointerExited; }protected override void OnDetaching() {base.OnDetaching(); AssociatedObject.PointerEntered -= OnAssociatedObjectPointerEntered; AssociatedObject.PointerExited -= OnAssociatedObjectPointerExited; }private void OnAssociatedObjectPointerExited(object sender, PointerRoutedEventArgs e) {UpdateAngle(e); }private void OnAssociatedObjectPointerEntered(object sender, PointerRoutedEventArgs e) {UpdateAngle(e); }private void UpdateAngle(PointerRoutedEventArgs e) {if (AssociatedObject == null || AssociatedObject.StrokeThickness == 0)return; AssociatedObject.RenderTransformOrigin = new Point(0.5, 0.5);var rotateTransform = AssociatedObject.RenderTransform as RotateTransform;if (rotateTransform == null) { rotateTransform = new RotateTransform(); AssociatedObject.RenderTransform = rotateTransform; }var point = e.GetCurrentPoint(AssociatedObject.Parent as UIElement).Position;var centerPoint = new Point(AssociatedObject.ActualWidth / 2, AssociatedObject.ActualHeight / 2);var angleOfLine = Math.Atan2(point.Y - centerPoint.Y, point.X - centerPoint.X) * 180 / Math.PI; rotateTransform.Angle = angleOfLine + 180; }}这个类命名不是很好，不过将就一下吧。
为了做出边框延伸的效果，另外需要一个类EllipseProgressBehavior：
public class EllipseProgressBehavior : Behavior<Ellipse>{/// <summary>/// 获取或设置Progress的值/// </summary> public double Progress { get { return (double)GetValue(ProgressProperty); } set { SetValue(ProgressProperty, value); } }/// <summary>/// 标识 Progress 依赖属性。/// </summary> public static readonly DependencyProperty ProgressProperty = DependencyProperty.Register("Progress", typeof(double), typeof(EllipseProgressBehavior), new PropertyMetadata(0d, OnProgressChanged)); private static void OnProgressChanged(DependencyObject obj, DependencyPropertyChangedEventArgs args) { var target = obj as EllipseProgressBehavior; double oldValue = (double)args.OldValue; double newValue = (double)args.NewValue;if (oldValue != newValue) target.OnProgressChanged(oldValue, newValue); } protected virtual void OnProgressChanged(double oldValue, double newValue) {UpdateStrokeDashArray(); }protected virtual double GetTotalLength() {if (AssociatedObject == null)return 0; return (AssociatedObject.ActualHeight - AssociatedObject.StrokeThickness) * Math.PI; }private void UpdateStrokeDashArray() {if (AssociatedObject == null || AssociatedObject.StrokeThickness == 0) return; //if (target.ActualHeight == 0 || target.ActualWidth == 0)// return;var totalLength = GetTotalLength(); totalLength = totalLength / AssociatedObject.StrokeThickness; var thirdSection = Progress * totalLength / 100; var secondSection = (totalLength - thirdSection) / 2; var result = new DoubleCollection { 0, secondSection, thirdSection, double.MaxValue }; AssociatedObject.StrokeDashArray = result; }}套用到ControlTemplate如下：
<ControlTemplate TargetType="Button"><Grid x:Name="RootGrid"><VisualStateManager.VisualStateGroups><VisualStateGroup x:Name="CommonStates"><VisualStateGroup.Transitions><VisualTransition GeneratedDuration="0:0:1" To="Normal"><Storyboard><DoubleAnimationUsingKeyFrames EnableDependentAnimation="True" Storyboard.TargetProperty="(local:EllipseProgressBehavior.Progress)" Storyboard.TargetName="EllipseProgressBehavior"><EasingDoubleKeyFrame KeyTime="0:0:1" Value="0"><EasingDoubleKeyFrame.EasingFunction><QuinticEase EasingMode="EaseOut" /></EasingDoubleKeyFrame.EasingFunction></EasingDoubleKeyFrame></DoubleAnimationUsingKeyFrames></Storyboard></VisualTransition><VisualTransition GeneratedDuration="0:0:1" To="PointerOver"><Storyboard><DoubleAnimationUsingKeyFrames EnableDependentAnimation="True" Storyboard.TargetProperty="(local:EllipseProgressBehavior.Progress)" Storyboard.TargetName="EllipseProgressBehavior"><EasingDoubleKeyFrame KeyTime="0:0:1" Value="100"><EasingDoubleKeyFrame.EasingFunction><QuinticEase EasingMode="EaseOut" /></EasingDoubleKeyFrame.EasingFunction></EasingDoubleKeyFrame></DoubleAnimationUsingKeyFrames></Storyboard></VisualTransition></VisualStateGroup.Transitions><VisualState x:Name="Normal"><Storyboard><PointerUpThemeAnimation Storyboard.TargetName="RootGrid" /></Storyboard></VisualState><VisualState x:Name="PointerOver"><Storyboard><PointerUpThemeAnimation Storyboard.TargetName="RootGrid" /></Storyboard><VisualState.Setters><Setter Target="EllipseProgressBehavior.(local:EllipseProgressBehavior.Progress)" Value="100" /></VisualState.Setters></VisualState><VisualState x:Name="Pressed"><Storyboard><PointerDownThemeAnimation Storyboard.TargetName="RootGrid" /></Storyboard></VisualState><VisualState x:Name="Disabled" /></VisualStateGroup></VisualStateManager.VisualStateGroups><ContentPresenter x:Name="ContentPresenter" AutomationProperties.AccessibilityView="Raw" ContentTemplate="{TemplateBinding ContentTemplate}" ContentTransitions="{TemplateBinding ContentTransitions}" Content="{TemplateBinding Content}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Padding="{TemplateBinding Padding}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" /><Ellipse Fill="Transparent" Stroke="{TemplateBinding BorderBrush}" StrokeThickness="2"><interactivity:Interaction.Behaviors><local:ChangeAngleToEnterPointerBehavior /><local:EllipseProgressBehavior x:Name="EllipseProgressBehavior" /></interactivity:Interaction.Behaviors></Ellipse></Grid></ControlTemplate>注意：我没有鼓励任何人自定义按钮外观的意思，能用系统自带的动画或样式就尽量用系统自带的，没有设计师的情况下又想UI做得与众不同通常会做得很难看。想要UI好看，合理的布局、合理的颜色、合理的图片就足够了。
6. 结语
在学习Shape的过程中觉得好玩就做了很多尝试，因为以前工作中做过不少等待、进度的动画，所以这次就试着做出本文的动画。
XAML的传统动画并没有提供太多功能，主要是ColorAnimation、DoubleAnimation、PointAnimation三种，不过靠Binding和Converter可以弥补这方面的不足，实现很多需要的功能。
本文的一些动画效果参考了SVG的动画。话说回来，Windows 10 1703新增了SvgImageSource，不过看起来只是简单地将SVG翻译成对应的Shape，然后用Shape呈现，不少高级特性都不支持（如下图阴影的滤镜），用法如下：
<Image><Image.Source><SvgImageSource UriSource="feoffset_1.svg" /></Image.Source></Image>
SvgImageSource：
原本的Svg：
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