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Code Animation Accelerate Decelerate

<Window x: Class="SimpleCodeAnimation.AccelerateDecelerate"     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"     Title="Acceleration and Deceleration" Height="300" Width="300">     <Grid>       <Ellipse Name="myEllipse" Fill="Red" Height="100" Width="10" />     </Grid> </Window> //File:Window.xaml.vb Imports System Imports System.Collections.Generic Imports System.Text Imports System.Windows Imports System.Windows.Controls Imports System.Windows.Data Imports System.Windows.Documents Imports System.Windows.Input Imports System.Windows.Media Imports System.Windows.Media.Imaging Imports System.Windows.Shapes Imports System.Windows.Media.Animation Namespace SimpleCodeAnimation   Public Partial Class AccelerateDecelerate     Inherits System.Windows.Window     Public Sub New()       InitializeComponent()     End Sub     Protected Overrides Sub OnMouseDown(e As MouseButtonEventArgs)       Dim animate As New DoubleAnimation()       animate.By = 100       animate.Duration = New Duration(TimeSpan.FromSeconds(3))       animate.AccelerationRatio = 0.2       animate.DecelerationRatio = 0.1       myEllipse.BeginAnimation(Ellipse.WidthProperty, animate)     End Sub   End Class End Namespace