C#

<Window Height="480" Title="Window2" Width="640" x:Class="WpfApplication5.Window2"
     x:Name="Window" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
<Window.Resources>
<Storyboard x:Key="OnLoaded1">
<DoubleAnimationUsingKeyFrames Storyboard.TargetName="ctrCircle" 
    Storyboard.TargetProperty="(UIElement.RenderTransform).( TransformGroup.Children)[3].(TranslateTransform.X)">
<EasingDoubleKeyFrame KeyTime="0:0:0.8" Value="1">
<EasingDoubleKeyFrame.EasingFunction>
<ExponentialEase EasingMode="EaseOut" />
</EasingDoubleKeyFrame.EasingFunction>
</EasingDoubleKeyFrame>
        </DoubleAnimationUsingKeyFrames>
        <DoubleAnimationUsingKeyFrames Storyboard.TargetName="ctrCircle" 
            Storyboard.TargetProperty="(UIElement.RenderTransform).(TransformGroup.Children)[3].(TranslateTransform.Y)">
                <EasingDoubleKeyFrame KeyTime="0:0:0.8" Value="1">
                    <EasingDoubleKeyFrame.EasingFunction>
                        <ExponentialEase EasingMode="EaseOut" />
                    </EasingDoubleKeyFrame.EasingFunction>
                </EasingDoubleKeyFrame>
            </DoubleAnimationUsingKeyFrames>
        </Storyboard>
        <Style TargetType="Ellipse">
       <Setter Property="RenderTransform">
            <Setter.Value>
                <ScaleTransform ScaleX="1" ScaleY="1"/>
           </Setter.Value>
        </Setter>
       <Setter Property="RenderTransformOrigin" Value="0.5,0.5"/>
    </Style>
    </Window.Resources>
 <Canvas MouseMove="mov" x:Name="LayoutRoot">
    <Border ackground="Black" B="" Canvas.Left="178" Canvas.Top="103" 
        CornerRadius="250" Height="255.5" Width="290" x:Name="border_eye">
        <Ellipse Fill="#FFFFC600" Height="12" HorizontalAlignment="Left" 
            Margin="0" RenderTransformOrigin="0.5,0.5" Stroke="{x:Null}" 
            VerticalAlignment="Center" Visibility="Visible" Width="12" x:Name="ctrCircle">
            <Ellipse.RenderTransform>
                <TransformGroup>
                     <ScaleTransform />
                    <SkewTransform />
                    <RotateTransform />
                    <TranslateTransform />                 
                </TransformGroup>
            </Ellipse.RenderTransform>
        </Ellipse>
    </Border>
</Canvas>
</Window>

private void mov(object sender, MouseEventArgs e)
        {
	 System.Windows.Point pt = e.GetPosition((Canvas)sender);
          Storyboard invokeStoryboard = this.Resources["OnLoaded1"] as Storyboard;
            ((DoubleAnimationUsingKeyFrames)invokeStoryboard.Children[0]).KeyFrames[0].Value = pt.X;
            ((DoubleAnimationUsingKeyFrames)invokeStoryboard.Children[1]).KeyFrames[0].Value = pt.Y;
            invokeStoryboard.Begin();
        }