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40 lines
3.7 KiB
Markdown
40 lines
3.7 KiB
Markdown
---
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title: "How to: Animate a Point by Using Key Frames"
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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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- "key frames [WPF], animating Points with"
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- "Points [WPF], animating with key frames"
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- "animation [WPF], Points with key frames"
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ms.assetid: d2e2ef10-0773-4133-856e-d41c09f60ded
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---
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# How to: Animate a Point by Using Key Frames
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This example shows how to use the <xref:System.Windows.Media.Animation.PointAnimationUsingKeyFrames> class to animate a <xref:System.Windows.Point>.
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## Example
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The following example moves an ellipse along a triangular path. The example uses the <xref:System.Windows.Media.Animation.PointAnimationUsingKeyFrames> class to animate the <xref:System.Windows.Media.EllipseGeometry.Center%2A> property of an <xref:System.Windows.Media.EllipseGeometry>. This animation uses three key frames in the following manner:
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1. During the first half second, uses an instance of the <xref:System.Windows.Media.Animation.LinearPointKeyFrame> class to move the ellipse along a path at a steady rate from its starting position. Linear key frames like <xref:System.Windows.Media.Animation.LinearPointKeyFrame> create a smooth linear interpolation between values.
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2. During the end of the next half second, uses an instance of the <xref:System.Windows.Media.Animation.DiscretePointKeyFrame> class to suddenly move the ellipse along the path to the next position. Discrete key frames like <xref:System.Windows.Media.Animation.DiscretePointKeyFrame> create sudden jumps between values.
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3. During the final two seconds, uses an instance of the <xref:System.Windows.Media.Animation.SplinePointKeyFrame> class to move the ellipse back to its starting position. Spline key frames like <xref:System.Windows.Media.Animation.SplinePointKeyFrame> create a variable transition between values according to the values of the <xref:System.Windows.Media.Animation.SplinePointKeyFrame.KeySpline%2A> property. In this example, the animation begins slowly and speeds up exponentially toward the end of the time segment.
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[!code-csharp[keyframes_snip#PointAnimationUsingKeyFramesWholePage](~/samples/snippets/csharp/VS_Snippets_Wpf/keyframes_snip/CSharp/PointAnimationUsingKeyFramesExample.cs#pointanimationusingkeyframeswholepage)]
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[!code-vb[keyframes_snip#PointAnimationUsingKeyFramesWholePage](~/samples/snippets/visualbasic/VS_Snippets_Wpf/keyframes_snip/visualbasic/pointanimationusingkeyframesexample.vb#pointanimationusingkeyframeswholepage)]
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[!code-xaml[keyframes_snip#PointAnimationUsingKeyFramesWholePage](~/samples/snippets/xaml/VS_Snippets_Wpf/keyframes_snip/XAML/PointAnimationUsingKeyFramesExample.xaml#pointanimationusingkeyframeswholepage)]
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For the complete sample, see [KeyFrame Animation Sample](https://github.com/microsoft/WPF-Samples/tree/master/Animation/KeyFrameAnimation).
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For consistency with other animation examples, the code versions of this example use a <xref:System.Windows.Media.Animation.Storyboard> object to apply the <xref:System.Windows.Media.Animation.PointAnimationUsingKeyFrames>. However, when applying a single animation in code, it's simpler to use the <xref:System.Windows.Media.Animation.Animatable.BeginAnimation%2A> method instead of using a <xref:System.Windows.Media.Animation.Storyboard>. 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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- <xref:System.Windows.Media.Animation.PointAnimationUsingKeyFrames>
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- <xref:System.Windows.Media.EllipseGeometry.Center%2A?displayProperty=nameWithType>
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- <xref:System.Windows.Media.EllipseGeometry>
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- [Key-Frame Animations Overview](key-frame-animations-overview.md)
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- [Key-Frame How-to Topics](key-frame-animation-how-to-topics.md)
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