WPF 路径动画
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/14020798/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
WPF path animation
提问by SysAdmin
I have created the following XAML
我创建了以下 XAML
<Canvas Background="Gray" Margin="10">
<Ellipse x:Name="Node1" Width="20" Height="20" Fill="AliceBlue" Canvas.Left="38" Canvas.Top="136" />
<Ellipse x:Name="Node2" Width="20" Height="20" Fill="AliceBlue" Canvas.Left="290" Canvas.Top="136" />
<Ellipse x:Name="object" Width="10" Height="20" Fill="Black" Canvas.Left="43" Canvas.Top="125" />
<Path Stroke="Black" StrokeThickness="1">
<Path.Data>
<PathGeometry>
<PathGeometry.Figures>
<PathFigureCollection>
<PathFigure StartPoint="50,145">
<PathFigure.Segments>
<PathSegmentCollection>
<LineSegment Point="100,100" />
<LineSegment Point="250,100" />
<LineSegment Point="300,145" />
</PathSegmentCollection>
</PathFigure.Segments>
</PathFigure>
</PathFigureCollection>
</PathGeometry.Figures>
</PathGeometry>
</Path.Data>
</Path>
</Canvas>
As you can see, I have created 2 elliptical Nodes. A path connecting the two nodes and an object sitting at node 1. All I want to do here is to animate the object at node1 along the path towards node2.
如您所见，我创建了 2 个椭圆节点。一条连接两个节点的路径和一个位于节点 1 的对象。我在这里要做的就是沿着指向节点 2 的路径为节点 1 处的对象设置动画。
I am trying to do the animation using codeas I want the animation to happen on click of the node2. I have been struggling with DoubleAnimation, MatrixAnimation,storyboard..Very confusing. Please share you knowledge on how to achieve this. I am hoping the same code would work with curves and complex paths.
我正在尝试使用代码制作动画，因为我希望动画在单击 node2 时发生。我一直在为 DoubleAnimation、MatrixAnimation、storyboard 苦苦挣扎……非常混乱。请分享您关于如何实现这一目标的知识。我希望相同的代码可以处理曲线和复杂的路径。
回答by StaWho
You need DoubleAnimationUsingPath(ref):
你需要DoubleAnimationUsingPath（参考）：
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Class="WpfApplication1.MainWindow"
x:Name="Window"
Title="MainWindow"
Width="640" Height="480">
<Window.Resources>
<Storyboard x:Key="Storyboard1">
<DoubleAnimationUsingPath Duration="0:0:2" Source="X" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.X)" Storyboard.TargetName="object">
<DoubleAnimationUsingPath.PathGeometry>
<PathGeometry Figures="M2,10 L52,-35 L202,-35 L252,10"/>
</DoubleAnimationUsingPath.PathGeometry>
</DoubleAnimationUsingPath>
<DoubleAnimationUsingPath Duration="0:0:2" Source="Y" Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.Y)" Storyboard.TargetName="object">
<DoubleAnimationUsingPath.PathGeometry>
<PathGeometry Figures="M2,10 L52,-35 L202,-35 L252,10"/>
</DoubleAnimationUsingPath.PathGeometry>
</DoubleAnimationUsingPath>
</Storyboard>
</Window.Resources>
<Grid x:Name="LayoutRoot">
<Canvas Background="Gray" Margin="10">
<Ellipse x:Name="Node1" Width="20" Height="20" Fill="AliceBlue" Canvas.Left="38" Canvas.Top="136" />
<Ellipse x:Name="Node2" Width="20" Height="20" Fill="AliceBlue" Canvas.Left="290" Canvas.Top="136" />
<Ellipse x:Name="object" Width="10" Height="20" Fill="Black" Canvas.Left="43" Canvas.Top="125" RenderTransformOrigin="0.5,0.5" MouseLeftButtonDown="object_MouseLeftButtonDown" >
<Ellipse.RenderTransform>
<TransformGroup>
<ScaleTransform/>
<SkewTransform/>
<RotateTransform/>
<TranslateTransform/>
</TransformGroup>
</Ellipse.RenderTransform>
</Ellipse>
<Path Stroke="Black" StrokeThickness="1">
<Path.Data>
<PathGeometry>
<PathGeometry.Figures>
<PathFigureCollection>
<PathFigure StartPoint="50,145">
<PathFigure.Segments>
<PathSegmentCollection>
<LineSegment Point="100,100" />
<LineSegment Point="250,100" />
<LineSegment Point="300,145" />
</PathSegmentCollection>
</PathFigure.Segments>
</PathFigure>
</PathFigureCollection>
</PathGeometry.Figures>
</PathGeometry>
</Path.Data>
</Path>
</Canvas>
</Grid>
</Window>
Then to invoke from code:
然后从代码调用：
private void object_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
Storyboard animation = this.TryFindResource("Storyboard1") as Storyboard;
animation.Begin();
}
[EDIT] I think you're missing critical tool here: Blend. As for creating animation in code, if you look at XAML elements, think about them as serialized classes, which can be reflected in code, i.e.
[编辑] 我认为您在这里缺少关键工具：Blend。至于在代码中创建动画，如果你看XAML元素，把它们想成是序列化的类，可以在代码中体现，即
Storyboard sb = new Storyboard();
DoubleAnimationUsingPath ani_2 = new DoubleAnimationUsingPath();
ani_2.Duration = new Duration(new TimeSpan(0, 0, 2));
PathGeometry pg = new PathGeometry();
pg.Figures.Add(new PathFigure());
ani_2.PathGeometry.AddGeometry(pg);
etc. It is however (IMAO) fairly painful to create those straight from code. It all really depends on the application. Have a look herefor a starting point on Blend.
等等。然而（IMAO）直接从代码创建这些是相当痛苦的。这完全取决于应用程序。看看这里的共混物的起点。
