How to: Animate a Matrix by Using Key Frames
This example shows how to animate the Matrix property of a MatrixTransform by using key frames.
Example
The following example uses the MatrixAnimationUsingKeyFrames class to animate the Matrix property of a MatrixTransform. The example uses the MatrixTransform object to transform the appearance and position of a Button.
This animation uses the DiscreteMatrixKeyFrame class to create two key frames and does the following with them:
Animates the first Matrix during the first 0.2 seconds. The example changes the M11 and M12 properties of the Matrix. This change causes the button to stretch and become skewed. The example also changes the OffsetX and OffsetY properties so that the button changes position.
Animates the second Matrix at 1.0 seconds. The button moves to another position while the button is no longer skewed or stretched.
Repeats the animation indefinitely.
Note
Key frames that derive from the DiscreteMatrixKeyFrame object create sudden jumps between values, that is, the movement of the animation is jerky.
<Page
xmlns="https://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="https://schemas.microsoft.com/winfx/2006/xaml"
Title="MatrixAnimationUsingPath Example">
<StackPanel Margin="20">
<Canvas HorizontalAlignment="Left" Width="340" Height="240" >
<!-- The Button that is animated. -->
<Button Margin="-30,0,0,0" MinWidth="100">
Click
<Button.RenderTransform>
<MatrixTransform x:Name="myMatrixTransform">
<MatrixTransform.Matrix >
<Matrix OffsetX="10" OffsetY="100"/>
</MatrixTransform.Matrix>
</MatrixTransform>
</Button.RenderTransform>
<Button.Triggers>
<EventTrigger RoutedEvent="Button.Loaded">
<BeginStoryboard>
<Storyboard>
<!-- Animates the button's MatrixTransform using MatrixAnimationUsingKeyFrames.
Animates to first Matrix in the first 0.2 seconds, to second Matrix in the next
second, and then starts over. Notice that the first KeyFrame stretches the button
and skews it using the M11 and M12 Matrix properties respectively. Also, animations are
using Discrete interpolation, so the MatrixTransform appears to "jump" from one value
to the next. -->
<MatrixAnimationUsingKeyFrames
Storyboard.TargetName="myMatrixTransform"
Storyboard.TargetProperty="Matrix"
Duration="0:0:3"
RepeatBehavior="Forever">
<DiscreteMatrixKeyFrame KeyTime="0:0:0.2">
<DiscreteMatrixKeyFrame.Value>
<Matrix OffsetX="100" OffsetY="200" M11="3" M12="1" />
</DiscreteMatrixKeyFrame.Value>
</DiscreteMatrixKeyFrame>
<DiscreteMatrixKeyFrame KeyTime="0:0:1">
<DiscreteMatrixKeyFrame.Value>
<Matrix OffsetX="300" OffsetY="100" M11="1" M12="0" />
</DiscreteMatrixKeyFrame.Value>
</DiscreteMatrixKeyFrame>
</MatrixAnimationUsingKeyFrames>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Button.Triggers>
</Button>
</Canvas>
</StackPanel>
</Page>
For the complete sample, see KeyFrame Animation Sample.