Animation In Code

   
  

<Grid xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
  xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
  xmlns:d="http://schemas.microsoft.com/expression/interactivedesigner/2006"
  mc:Ignorable="d" Background="#FFFFFFFF" x:Name="DocumentRoot"
  x:Class="AnimationExamples.AnimationInCode" Width="640" Height="480">
  <Grid.Resources>
    <Storyboard x:Key="OnLoaded"/>
  </Grid.Resources>

  <Grid.Triggers>
    <EventTrigger RoutedEvent="FrameworkElement.Loaded">
      <BeginStoryboard x:Name="OnLoaded_BeginStoryboard" Storyboard="{DynamicResource OnLoaded}"/>
    </EventTrigger>
  </Grid.Triggers>
  
  <Grid.ColumnDefinitions>
    <ColumnDefinition/>
  </Grid.ColumnDefinitions>
  <Grid.RowDefinitions>
    <RowDefinition/>
  </Grid.RowDefinitions>
  <Slider d:LayoutOverrides="Width, Height" HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="0,0,212,87" Width="105" Height="33" x:Name="WidthControl" Maximum="100" Minimum="0"/>
  <Label d:LayoutOverrides="Width, Height" HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="208,0,0,97.893333333333" Width="100" Height="23.2766666666667" x:Name="ContentLabel" Content="Circle Opacity:" RenderTransformOrigin="0.5,0.5" TabIndex="4"/>
  <Ellipse Stroke="{x:Null}" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="228,163,233,138" Width="Auto" Height="Auto" x:Name="MyControl">
    <Ellipse.Fill>
      <RadialGradientBrush>
        <GradientStop Color="#FFFFFFFF" Offset="0"/>
        <GradientStop Color="#FF87001C" Offset="0.73735921399473"/>
        <GradientStop Color="#FF4C000F" Offset="1"/>
      </RadialGradientBrush>
    </Ellipse.Fill>
  </Ellipse>
</Grid>
//File:Window.xaml.cs
using System;
using System.IO;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace AnimationExamples
{
  public partial class AnimationInCode
  {
    public AnimationInCode()
    {
      this.InitializeComponent();
    }
    
    protected override void OnInitialized(EventArgs e)
    {
      base.OnInitialized(e);
      
      DoubleCollection tickMarks = new DoubleCollection();
      tickMarks.Add(0);
      tickMarks.Add(100);
      
      this.WidthControl.Ticks = tickMarks;
      this.WidthControl.TickPlacement = TickPlacement.BottomRight;
      this.WidthControl.AutoToolTipPlacement = AutoToolTipPlacement.TopLeft;
        this.WidthControl.AutoToolTipPrecision = 0;
      this.WidthControl.Value = this.WidthControl.Maximum;
      this.WidthControl.PreviewMouseUp += new MouseButtonEventHandler(WidthControl_MouseUp);
    }

    private void WidthControl_MouseUp(object sender, MouseButtonEventArgs e)
    {
      DoubleAnimation moveAnimation = new DoubleAnimation();
      moveAnimation.From = this.MyControl.Opacity;
      moveAnimation.To = this.WidthControl.Value / this.WidthControl.Maximum;
      moveAnimation.Duration = new Duration(TimeSpan.FromSeconds(.5));
      moveAnimation.DecelerationRatio = .5;
      
      MyControl.BeginAnimation(Shape.OpacityProperty, moveAnimation);
    }
  }
}