The defensive force of the iPad tower guard was amazing, and it was simulated with WPF in two hours.
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Key code:
<Grid> <Grid.Background> <ImageBrush ImageSource="Koala.jpg"/> </Grid.Background> <Button Content="Button1" HorizontalAlignment="Left" Margin="187,107,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click_1"/> <Grid x:Name="m_Grid" HorizontalAlignment="Left" VerticalAlignment="Top" Height="300" Width="300" MouseUp="m_Grid_MouseUp" Margin="69,31,0,0"> <Ellipse Stroke="White" StrokeThickness="1"> <Ellipse.Fill> <RadialGradientBrush Opacity="1" RadiusX="0.5" RadiusY="0.5" GradientOrigin="0.5,0.5"> <GradientStop Color="White" Offset="1.1" ></GradientStop> <GradientStop Color="Transparent" Offset="0.92"></GradientStop> </RadialGradientBrush> </Ellipse.Fill> </Ellipse> <Ellipse x:Name="m_Ellipse" Stroke="White" Margin="4"> <Ellipse.Fill> <RadialGradientBrush Opacity="1" RadiusX="0.5" RadiusY="0.5" GradientOrigin="0.5,0.5"> <GradientStop Color="White" Offset="0.97" ></GradientStop> <GradientStop Color="Transparent" Offset="0.96"></GradientStop> </RadialGradientBrush> </Ellipse.Fill> <Ellipse.Clip> <RectangleGeometry Rect="0,0,100,100" /> </Ellipse.Clip> <Ellipse.RenderTransform> <RotateTransform Angle="0" CenterX="146" CenterY="146" /> </Ellipse.RenderTransform> <Ellipse.Triggers> <EventTrigger RoutedEvent="Window.Loaded"> <BeginStoryboard> <Storyboard RepeatBehavior="Forever"> <DoubleAnimation Storyboard.TargetName="m_Ellipse" Storyboard.TargetProperty="(Ellipse.RenderTransform).(RotateTransform.Angle)" To="180" Duration="0:0:5"/> </Storyboard> </BeginStoryboard> </EventTrigger> </Ellipse.Triggers> </Ellipse> <Ellipse x:Name="m_Ellipse2" Stroke="White" Margin="4"> <Ellipse.Fill> <RadialGradientBrush Opacity="1" RadiusX="0.5" RadiusY="0.5" GradientOrigin="0.5,0.5"> <GradientStop Color="White" Offset="0.97" ></GradientStop> <GradientStop Color="Transparent" Offset="0.96"></GradientStop> </RadialGradientBrush> </Ellipse.Fill> <Ellipse.Clip> <RectangleGeometry Rect="0,0,100,100" /> </Ellipse.Clip> <Ellipse.RenderTransform> <RotateTransform Angle="180" CenterX="146" CenterY="146" /> </Ellipse.RenderTransform> <Ellipse.Triggers> <EventTrigger RoutedEvent="Window.Loaded"> <BeginStoryboard> <Storyboard RepeatBehavior="Forever"> <DoubleAnimation Storyboard.TargetName="m_Ellipse2" Storyboard.TargetProperty="(Ellipse.RenderTransform).(RotateTransform.Angle)" To="360" Duration="0:0:5"/> </Storyboard> </BeginStoryboard> </EventTrigger> </Ellipse.Triggers> </Ellipse> <Button Content="PopButton" HorizontalAlignment="Left" Margin="18,126,0,0" VerticalAlignment="Top" Width="75"/> </Grid> </Grid>