<Window x:Class="Animation.ImageWipe"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="ImageWipe" Height="300" Width="300">
<Grid>
<Grid.RowDefinitions>
<RowDefinition></RowDefinition>
<RowDefinition Height="Auto"></RowDefinition>
</Grid.RowDefinitions>
<Grid>
<Image Source="c:\image.jpg"></Image>
<Image Source="c:\image.jpg" Name="imgDay">
<Image.OpacityMask>
<LinearGradientBrush StartPoint="0,0" EndPoint="1,0">
<GradientStop Offset="0" Color="Transparent" x:Name="transparentStop" />
<GradientStop Offset="0" Color="Black" x:Name="visibleStop" />
</LinearGradientBrush>
</Image.OpacityMask>
</Image>
</Grid>
<Button Name="cmdStart" Grid.Row="1" Padding="5" Margin="5">
Start
<Button.Triggers>
<EventTrigger SourceName="cmdStart" RoutedEvent="Button.Click">
<BeginStoryboard>
<Storyboard>
<DoubleAnimation
Storyboard.TargetName="transparentStop"
Storyboard.TargetProperty="Offset" BeginTime="0:0:0.2"
From="0" To="1" Duration="0:0:1" ></DoubleAnimation>
<DoubleAnimation
Storyboard.TargetName="visibleStop"
Storyboard.TargetProperty="Offset"
From="0" To="1.2" Duration="0:0:1.2" ></DoubleAnimation>
</Storyboard>
</BeginStoryboard>
</EventTrigger>
</Button.Triggers>
</Button>
</Grid>
</Window>
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