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How to: Animate an Object by Using Key Frames

03/30/2017

animation [WPF], objects with key frames

key frames [WPF], animating objects with

b1f15ba9-cac7-4cea-8699-5c6b55c05c5e

How to: Animate an Object by Using Key Frames

This example shows how to animate an object, which in this example is the xref:System.Windows.Controls.Page.Background%2A property of a xref:System.Windows.Controls.Page control, by using key frames.

Example

The following example uses the xref:System.Windows.Media.Animation.ObjectAnimationUsingKeyFrames class to animate color changes for the xref:System.Windows.Controls.Page.Background%2A property of a xref:System.Windows.Controls.Page control. The example animation changes to a different background brush at regular intervals. This animation uses the xref:System.Windows.Media.Animation.DiscreteObjectKeyFrame class to create three different key frames. The animation uses key frames in the following manner:

At the end of the first second, animates an instance of the xref:System.Windows.Media.LinearGradientBrush class. This section of the example applies a linear gradient to the background color so that the color transitions from yellow to orange to red.
At the end of the next second, animates an instance of the xref:System.Windows.Media.RadialGradientBrush class. This section of the example applies a radial gradient to the background color so that the color transitions from white to blue to black.
At the end of the third second, animates an instance of the xref:System.Windows.Media.DrawingBrush class. This section of the example applies a checkerboard pattern to the background.
The animation begins again and repeats indefinitely.

Note

xref:System.Windows.Media.Animation.DiscreteObjectKeyFrame is the only type of key frame that you can use with the xref:System.Windows.Media.Animation.ObjectAnimationUsingKeyFrames class. Key frames like xref:System.Windows.Media.Animation.DiscreteObjectKeyFrame create sudden changes in values, that is, the color changes in this example occur suddenly.

[!code-xamlkeyframes_snip#ObjectAnimationUsingKeyFramesWholePage]

For the complete sample, see KeyFrame Animation Sample.

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How to: Animate an Object by Using Key Frames

Example

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