Animated ScaleTransform

   
  

<Window x:Class="Workspace.DockExample"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Workspace" Width="640" Height="480">
    <StackPanel Orientation="Horizontal"> 
        <Canvas Width="200" Height="200">
            <Polyline Name="myAnimatedPolyline"
              Points="25,25 0,50 25,75 50,50 25,25 25,0" Stroke="Blue" StrokeThickness="10"
                 Canvas.Left="75" Canvas.Top="50">
                <Polyline.RenderTransform>

                    <TransformGroup>
                        <TransformGroup.Children>
                            <TransformCollection>
                                <RotateTransform 
                                  x:Name="AnimatedRotateTransform"
                                  CenterX="25" CenterY="50" Angle="0" />
                                <ScaleTransform 
                                  x:Name="AnimatedScaleTransform"
                                  CenterX="25" CenterY="50" ScaleX="1" ScaleY="1" />
                            </TransformCollection>
                        </TransformGroup.Children>
                    </TransformGroup>
                    
                </Polyline.RenderTransform>
            </Polyline>
        </Canvas>
        <Button Name="startButton" Margin="0,0,2,0">Start</Button>
        <Button Name="stopButton">Stop</Button>
        <StackPanel.Triggers>
          <EventTrigger SourceName="startButton" RoutedEvent="Button.Click">
            <BeginStoryboard Name="myBeginStoryboard">
              <Storyboard>
                <DoubleAnimation Storyboard.TargetName="AnimatedRotateTransform"
                  Storyboard.TargetProperty="Angle" 
                  From="0" To="360" Duration="0:0:5" RepeatBehavior="Forever" />
                <DoubleAnimation 
                  Storyboard.TargetName="AnimatedScaleTransform"
                  Storyboard.TargetProperty="ScaleX"
                  From="0" To="3" Duration="0:0:5" RepeatBehavior="Forever"
                  AutoReverse="True" />
                <DoubleAnimation  
                  Storyboard.TargetName="AnimatedScaleTransform"
                  Storyboard.TargetProperty="ScaleY"
                  From="0" To="3" Duration="0:0:5" RepeatBehavior="Forever" 
                  AutoReverse="True"/>          
              </Storyboard>
            </BeginStoryboard>
          </EventTrigger>
          <EventTrigger SourceName="stopButton" RoutedEvent="Button.Click">
            <StopStoryboard BeginStoryboardName="myBeginStoryboard" />
          </EventTrigger>          
        </StackPanel.Triggers>        
      </StackPanel>
  
</Window>