WPF路径动画

本文关键字：动画 路径 WPF | 更新日期: 2023-09-27 17:49:29

我已经创建了以下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>

如你所见，我已经创建了2个椭圆节点。连接两个节点和位于节点1的对象的路径。我在这里要做的就是让node1上的对象沿着通往node2的路径动画化。

我正在尝试使用代码做动画，因为我希望动画发生在node2的点击上。我一直在与DoubleAnimation, MatrixAnimation,storyboard..非常让人困惑。请分享你关于如何实现这一目标的知识。我希望同样的代码将与曲线和复杂的路径工作。

WPF路径动画

您需要DoubleAnimationUsingPath (ref):

<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>

然后从代码中调用:

private void object_MouseLeftButtonDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
    Storyboard animation = this.TryFindResource("Storyboard1") as Storyboard;
    animation.Begin();
}

[编辑]我觉得你漏掉了一个关键的工具:混合。至于在代码中创建动画，如果您查看XAML元素，可以将它们视为序列化的类，它们可以在代码中反映出来，例如

    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);

等。然而(IMAO)直接从代码中创建这些是相当痛苦的。这完全取决于应用程序。点击这里查看Blend的起始点

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