Ball moves in a constant speed
<Window x:Class="SplineKeyFrameAnimation" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Title="Spline Key Frame Animation" Height="250" Width="400"> <Canvas Margin="5"> <Ellipse Name="ball1" Canvas.Left="10" Canvas.Top="50" Width="20" Height="20"> <Ellipse.Fill> <RadialGradientBrush> <GradientStop Color="Gold" Offset="0" /> <GradientStop Color="DarkGoldenrod" Offset="1" /> </RadialGradientBrush> </Ellipse.Fill> </Ellipse> <Canvas.Triggers> <EventTrigger RoutedEvent="StackPanel.Loaded"> <EventTrigger.Actions> <BeginStoryboard> <Storyboard> <DoubleAnimation Storyboard.TargetName="ball1" Storyboard.TargetProperty="(Canvas.Left)" To="310" Duration="0:0:10" RepeatBehavior="Forever" /> </Storyboard> </BeginStoryboard> </EventTrigger.Actions> </EventTrigger> </Canvas.Triggers> </Canvas> </Window>