CircularShutterEffect Class

c#[Silverlight C# Example] 
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.Windows.Media; 
using Leadtools.Windows.Media.Effects; 
using Leadtools.Windows.Controls; 
 
class CircularShutterEffectExampleWindow : UserControl 
{ 
   private ImageViewer theViewer; 
 
   public CircularShutterEffectExampleWindow() 
   { 
      StackPanel sp = new StackPanel(); 
      Content = sp; 
 
      theViewer = new ImageViewer(); 
 
      theViewer.HorizontalAlignment = HorizontalAlignment.Center; 
      theViewer.VerticalAlignment = VerticalAlignment.Top; 
      theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left; 
      theViewer.ImageVerticalAlignment = VerticalAlignment.Top; 
 
      sp.Children.Add(theViewer); 
 
      // Load an image into the viewer 
      theViewer.Source = new BitmapImage(new Uri(LeadtoolsExamples.Common.ImagesPath.Path + "Cannon.jpg")); 
 
      theViewer.MouseMove += new MouseEventHandler(theViewer_MouseMove); 
   } 
 
   private void theViewer_PreviewMouseDown(object sender, MouseButtonEventArgs e) 
   { 
      CircularShutterEffect effect = new CircularShutterEffect(); 
 
      Point pos = e.GetPosition(theViewer); 
 
      BitmapSource source = theViewer.Source as BitmapSource; 
      if (source != null) 
      { 
         effect.Center = new Point( 
            (1.0 * pos.X) / source.PixelWidth, 
            (1.0 * pos.Y) / source.PixelHeight); 
 
         effect.Radius = 0.25; 
         effect.AspectRatio = 1.0; 
         effect.ClearColor = Colors.Blue; 
         theViewer.ImageEffect = effect; 
      } 
   } 
 
   private void theViewer_MouseMove(object sender, MouseEventArgs e) 
   { 
      CircularShutterEffect effect = theViewer.ImageEffect as CircularShutterEffect; 
      if (effect != null) 
      { 
         Point pos = e.GetPosition(theViewer); 
 
         BitmapSource source = theViewer.Source as BitmapSource; 
         if (source != null) 
         { 
            effect.Center = new Point( 
               (1.0 * pos.X) / source.PixelWidth, 
               (1.0 * pos.Y) / source.PixelHeight); 
         } 
      } 
   } 
 
   private void theViewer_MouseUp(object sender, MouseButtonEventArgs e) 
   { 
      if (theViewer.ImageEffect != null) 
      { 
         theViewer.ImageEffect = null; 
      } 
   } 
} 
vb[Silverlight VB Example] 
Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.Windows.Controls 
Imports Leadtools.Windows.Media 
Imports Leadtools.Windows.Media.Effects 
 
Class CircularShutterEffectExampleWindow 
   Inherits UserControl 
   Private theViewer As ImageViewer 
 
   Public Sub New() 
      Dim sp As New StackPanel() 
      Content = sp 
 
      theViewer = New ImageViewer() 
 
      theViewer.HorizontalAlignment = HorizontalAlignment.Center 
      theViewer.VerticalAlignment = VerticalAlignment.Top 
      theViewer.ImageHorizontalAlignment = HorizontalAlignment.Left 
      theViewer.ImageVerticalAlignment = VerticalAlignment.Top 
 
      sp.Children.Add(theViewer) 
 
      ' Load an image into the viewer 
      theViewer.Source = New BitmapImage(New Uri(LeadtoolsExamples.Common.ImagesPath.Path + "Cannon.jpg")) 
 
      AddHandler theViewer.MouseMove, AddressOf theViewer_MouseMove 
   End Sub 
 
   Private Sub theViewer_PreviewMouseDown(ByVal sender As Object, ByVal e As MouseButtonEventArgs) 
      Dim effect As New CircularShutterEffect() 
 
      Dim pos As Point = e.GetPosition(theViewer) 
 
      Dim source As BitmapSource = DirectCast(theViewer.Source, BitmapSource) 
      If Not source Is Nothing Then 
         effect.Center = New Point( 
            (1.0 * pos.X) / source.PixelWidth, 
            (1.0 * pos.Y) / source.PixelHeight) 
 
         effect.Radius = 0.25 
         effect.AspectRatio = 1.0 
         effect.ClearColor = Colors.Blue 
         theViewer.ImageEffect = effect 
      End If 
   End Sub 
 
   Private Sub theViewer_MouseMove(ByVal sender As Object, ByVal e As MouseEventArgs) 
      Dim effect As CircularShutterEffect = DirectCast(theViewer.ImageEffect, CircularShutterEffect) 
      If Not effect Is Nothing Then 
         Dim pos As Point = e.GetPosition(theViewer) 
 
         Dim source As BitmapSource = DirectCast(theViewer.Source, BitmapSource) 
         If Not source Is Nothing Then 
            effect.Center = New Point( 
               (1.0 * pos.X) / source.PixelWidth, 
               (1.0 * pos.Y) / source.PixelHeight) 
         End If 
      End If 
   End Sub 
 
   Private Sub theViewer_MouseUp(ByVal sender As Object, ByVal e As MouseButtonEventArgs) 
      If Not theViewer.ImageEffect Is Nothing Then 
         theViewer.ImageEffect = Nothing 
      End If 
   End Sub 
End Class