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33 lines
2.9 KiB
Markdown
33 lines
2.9 KiB
Markdown
---
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title: "How to: Rotate an Object by Using a Geometric Path (Matrix Animation)"
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ms.date: "03/30/2017"
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dev_langs:
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- "csharp"
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- "vb"
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helpviewer_keywords:
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- "geometric paths [WPF], rotating objects by"
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- "rotating objects by geometric paths [WPF]"
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- "matrix animation [WPF]"
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ms.assetid: 877dc9aa-6bdc-4beb-8772-3efaec32c0f0
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---
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# How to: Rotate an Object by Using a Geometric Path (Matrix Animation)
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This example shows how to use a <xref:System.Windows.Media.Animation.MatrixAnimationUsingPath> and a <xref:System.Windows.Media.MatrixTransform> to rotate (pivot) an object along a geometric path defined by a <xref:System.Windows.Media.PathGeometry> object.
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## Example
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The following example uses the <xref:System.Windows.Media.Animation.MatrixAnimationUsingPath> object to animate the <xref:System.Windows.Media.MatrixTransform.Matrix%2A> property of a <xref:System.Windows.Media.MatrixTransform>. The <xref:System.Windows.Media.MatrixTransform> is applied to a button and causes it to move along a curved path. Because the <xref:System.Windows.Media.Animation.MatrixAnimationUsingPath.DoesRotateWithTangent%2A> property is set to `true`, the rectangle rotates along the tangent of the path.
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[!code-xaml[PathAnimationGallery_snippet#MatrixAnimationUsingPathDoesRotateWithTangentWholePage](~/samples/snippets/csharp/VS_Snippets_Wpf/PathAnimationGallery_snippet/CS/matrixanimationusingpathdoesrotatewithtangentexample.xaml#matrixanimationusingpathdoesrotatewithtangentwholepage)]
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[!code-csharp[PathAnimationGallery_procedural_snip#MatrixAnimationUsingPathDoesRotateWithTangentWholePage](~/samples/snippets/csharp/VS_Snippets_Wpf/PathAnimationGallery_procedural_snip/CSharp/MatrixAnimationUsingPathDoesRotateWithTangentExample.cs#matrixanimationusingpathdoesrotatewithtangentwholepage)]
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[!code-vb[PathAnimationGallery_procedural_snip#MatrixAnimationUsingPathDoesRotateWithTangentWholePage](~/samples/snippets/visualbasic/VS_Snippets_Wpf/PathAnimationGallery_procedural_snip/VisualBasic/MatrixAnimationUsingPathDoesRotateWithTangentExample.vb#matrixanimationusingpathdoesrotatewithtangentwholepage)]
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For the complete sample, see [Path Animation Sample](https://github.com/Microsoft/WPF-Samples/tree/master/Animation/PathAnimations).
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The code version of the preceding sample used a <xref:System.Windows.Media.Animation.Storyboard> to animate the <xref:System.Windows.Media.EllipseGeometry>, even though only one animation was applied. An easier way to apply a single animation to a property in code is to use the <xref:System.Windows.Media.Animation.Animatable.BeginAnimation%2A> method. For an example, see [Animate a Property Without Using a Storyboard](how-to-animate-a-property-without-using-a-storyboard.md).
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## See also
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- [Animation Overview](animation-overview.md)
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- [Path Animation How-to Topics](path-animation-how-to-topics.md)
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- [Path Animation Sample](https://github.com/Microsoft/WPF-Samples/tree/master/Animation/PathAnimations)
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