WindowLevelEffect Class

Fills and applies window leveling on the specified image.

Object Model

Syntax

Visual Basic
C#
Objective-C
Java
C++

public class WindowLevelEffect : System.Windows.Media.Effects.ShaderEffect, System.Windows.Media.Animation.IAnimatable

'Declaration
 
Public Class WindowLevelEffect 
   Inherits System.Windows.Media.Effects.ShaderEffect
   Implements System.Windows.Media.Animation.IAnimatable

'Usage
 
Dim instance As WindowLevelEffect

ObjectiveC Syntax

Java Syntax

public ref class WindowLevelEffect : public System.Windows.Media.Effects.ShaderEffect, System.Windows.Media.Animation.IAnimatable

Remarks

Provides "on demand" window-leveling as an effect and does not alter the image data.

To learn more about window-leveling, refer to RasterImage.WindowLevel, RasterImage.WindowLevelExt, WindowLevelCommand and Leadtools.ImageProcessing.Core.WindowLevelExtCommand.

Example

Visual Basic
C#
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

Class WindowLevelEffectExampleWindow
      Inherits Window
      Public Sub New()
         Dim sp As New StackPanel()
         Content = sp
         Dim theViewer As New RasterImageViewer()

         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
         Using codecs As New RasterCodecs()
            theViewer.Image = codecs.Load(System.IO.Path.Combine(LEAD_VARS.ImagesDir, "Image3.dcm"))
         End Using

         ' Create the sliders
         Dim tb As New TextBlock()
         tb.HorizontalAlignment = HorizontalAlignment.Center
         tb.Text = "Window Width:"
         sp.Children.Add(tb)

         Dim windowWidthSlider As New Slider()
         windowWidthSlider.Minimum = 0.0
         windowWidthSlider.Maximum = Math.Pow(2, theViewer.Image.BitsPerPixel - 1)
         windowWidthSlider.Width = 400
         windowWidthSlider.Orientation = Orientation.Horizontal
         windowWidthSlider.IsSnapToTickEnabled = True
         windowWidthSlider.TickPlacement = System.Windows.Controls.Primitives.TickPlacement.BottomRight
         windowWidthSlider.TickFrequency = 0.1
         windowWidthSlider.AutoToolTipPrecision = 2
         windowWidthSlider.AutoToolTipPlacement = System.Windows.Controls.Primitives.AutoToolTipPlacement.BottomRight

         sp.Children.Add(windowWidthSlider)

         tb = New TextBlock()
         tb.HorizontalAlignment = HorizontalAlignment.Center
         tb.Text = "Window Center:"
         sp.Children.Add(tb)

         Dim windowCenterSlider As New Slider()
         windowCenterSlider.Minimum = 0.0
         windowCenterSlider.Maximum = Math.Pow(2, theViewer.Image.BitsPerPixel - 1)
         windowCenterSlider.Width = 400
         windowCenterSlider.Orientation = Orientation.Horizontal
         windowCenterSlider.IsSnapToTickEnabled = True
         windowCenterSlider.TickPlacement = System.Windows.Controls.Primitives.TickPlacement.BottomRight
         windowCenterSlider.TickFrequency = 0.1
         windowCenterSlider.AutoToolTipPrecision = 2
         windowCenterSlider.AutoToolTipPlacement = System.Windows.Controls.Primitives.AutoToolTipPlacement.BottomRight

         sp.Children.Add(windowCenterSlider)

         ' Setup the effect
         Dim effect As New WindowLevelEffect()

         ' Set the texture
         effect.FillGrayTexture(theViewer.Image)
         effect.Start = Colors.Black
         effect.End = Colors.White
         effect.CurveType = CurveType.Linear
         effect.Factor = 0.0

         effect.WindowWidth = Math.Pow(2, theViewer.Image.MaxValue - theViewer.Image.MinValue)
         effect.WindowCenter = effect.WindowWidth / 2

         theViewer.ImageEffect = effect

         ' Bind the properties
         Dim bind As New Binding()
         bind.Source = effect
         bind.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
         bind.Path = New PropertyPath("WindowWidth")
         windowWidthSlider.SetBinding(Slider.ValueProperty, bind)

         bind = New Binding()
         bind.Source = effect
         bind.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged
         bind.Path = New PropertyPath("WindowCenter")
         windowCenterSlider.SetBinding(Slider.ValueProperty, bind)

         Title = "Using WindowLevelEffect"
      End Sub
   End Class

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

class WindowLevelEffectExampleWindow : Window
   {
      public WindowLevelEffectExampleWindow()
      {
         StackPanel sp = new StackPanel();
         Content = sp;
         RasterImageViewer theViewer = new RasterImageViewer();

         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
         using(RasterCodecs codecs = new RasterCodecs())
         {
            theViewer.Image = codecs.Load(System.IO.Path.Combine(LEAD_VARS.ImagesDir, "Image3.dcm"));
         }

         // Create the sliders
         TextBlock tb = new TextBlock();
         tb.HorizontalAlignment = HorizontalAlignment.Center;
         tb.Text = "Window Width:";
         sp.Children.Add(tb);

         Slider windowWidthSlider = new Slider();
         windowWidthSlider.Minimum = 0.0;
         windowWidthSlider.Maximum = Math.Pow(2, theViewer.Image.BitsPerPixel - 1);
         windowWidthSlider.Width = 400;
         windowWidthSlider.Orientation = Orientation.Horizontal;
         windowWidthSlider.IsSnapToTickEnabled = true;
         windowWidthSlider.TickPlacement = System.Windows.Controls.Primitives.TickPlacement.BottomRight;
         windowWidthSlider.TickFrequency = 0.1;
         windowWidthSlider.AutoToolTipPrecision = 2;
         windowWidthSlider.AutoToolTipPlacement = System.Windows.Controls.Primitives.AutoToolTipPlacement.BottomRight;

         sp.Children.Add(windowWidthSlider);

         tb = new TextBlock();
         tb.HorizontalAlignment = HorizontalAlignment.Center;
         tb.Text = "Window Center:";
         sp.Children.Add(tb);

         Slider windowCenterSlider = new Slider();
         windowCenterSlider.Minimum = 0.0;
         windowCenterSlider.Maximum = Math.Pow(2, theViewer.Image.BitsPerPixel - 1);
         windowCenterSlider.Width = 400;
         windowCenterSlider.Orientation = Orientation.Horizontal;
         windowCenterSlider.IsSnapToTickEnabled = true;
         windowCenterSlider.TickPlacement = System.Windows.Controls.Primitives.TickPlacement.BottomRight;
         windowCenterSlider.TickFrequency = 0.1;
         windowCenterSlider.AutoToolTipPrecision = 2;
         windowCenterSlider.AutoToolTipPlacement = System.Windows.Controls.Primitives.AutoToolTipPlacement.BottomRight;

         sp.Children.Add(windowCenterSlider);

         // Setup the effect
         WindowLevelEffect effect = new WindowLevelEffect();

         // Set the texture
         effect.FillGrayTexture(theViewer.Image);
         effect.Start = Colors.Black;
         effect.End = Colors.White;
         effect.CurveType = CurveType.Linear;
         effect.Factor = 0.0;

         effect.WindowWidth = Math.Pow(2, theViewer.Image.MaxValue - theViewer.Image.MinValue);
         effect.WindowCenter = effect.WindowWidth / 2;

         theViewer.ImageEffect = effect;

         // Bind the properties
         Binding bind = new Binding();
         bind.Source = effect;
         bind.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
         bind.Path = new PropertyPath("WindowWidth");
         windowWidthSlider.SetBinding(Slider.ValueProperty, bind);

         bind = new Binding();
         bind.Source = effect;
         bind.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged;
         bind.Path = new PropertyPath("WindowCenter");
         windowCenterSlider.SetBinding(Slider.ValueProperty, bind);

         Title = "Using WindowLevelEffect";
      }
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}

class WindowLevelEffectExampleWindow : UserControl
{
   public WindowLevelEffectExampleWindow()
   {
      StackPanel sp = new StackPanel();
      Content = sp;
      RasterImageViewer theViewer = new RasterImageViewer();

      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
      //using(RasterCodecs codecs = new RasterCodecs())
      {
         RasterCodecs codecs = new RasterCodecs();
         theViewer.Image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Image3.dcm");
      }

      // Create the sliders
      TextBlock tb = new TextBlock();
      tb.HorizontalAlignment = HorizontalAlignment.Center;
      tb.Text = "Window Width:";
      sp.Children.Add(tb);

      Slider windowWidthSlider = new Slider();
      windowWidthSlider.Minimum = 0.0;
      windowWidthSlider.Maximum = Math.Pow(2, theViewer.Image.BitsPerPixel - 1);
      windowWidthSlider.Width = 400;
      windowWidthSlider.Orientation = Orientation.Horizontal;

      sp.Children.Add(windowWidthSlider);

      tb = new TextBlock();
      tb.HorizontalAlignment = HorizontalAlignment.Center;
      tb.Text = "Window Center:";
      sp.Children.Add(tb);

      Slider windowCenterSlider = new Slider();
      windowCenterSlider.Minimum = 0.0;
      windowCenterSlider.Maximum = Math.Pow(2, theViewer.Image.BitsPerPixel - 1);
      windowCenterSlider.Width = 400;
      windowCenterSlider.Orientation = Orientation.Horizontal;

      sp.Children.Add(windowCenterSlider);

      // Setup the effect
      WindowLevelEffect effect = new WindowLevelEffect();

      // Set the texture
      effect.FillGrayTexture(theViewer.Image);
      effect.Start = Colors.Black;
      effect.End = Colors.White;
      effect.CurveType = CurveType.Linear;
      effect.Factor = 0.0;

      effect.WindowWidth = Math.Pow(2, theViewer.Image.MaxValue - theViewer.Image.MinValue);
      effect.WindowCenter = effect.WindowWidth / 2;

      theViewer.ImageEffect = effect;

      // Bind the properties
      Binding bind = new Binding();
      bind.Source = effect;
      bind.UpdateSourceTrigger = UpdateSourceTrigger.Default;
      bind.Path = new PropertyPath("WindowWidth");
      windowWidthSlider.SetBinding(Slider.ValueProperty, bind);

      bind = new Binding();
      bind.Source = effect;
      bind.UpdateSourceTrigger = UpdateSourceTrigger.Default;
      bind.Path = new PropertyPath("WindowCenter");
      windowCenterSlider.SetBinding(Slider.ValueProperty, bind);
   }
}

Class WindowLevelEffectExampleWindow
   Inherits UserControl
   Public Sub New()
      Dim sp As New StackPanel()
      Content = sp
      Dim theViewer As New RasterImageViewer()

      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
      Dim codecs As New RasterCodecs()
      theViewer.Image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Image3.dcm")

      ' Create the sliders
      Dim tb As New TextBlock()
      tb.HorizontalAlignment = HorizontalAlignment.Center
      tb.Text = "Window Width:"
      sp.Children.Add(tb)

      Dim windowWidthSlider As New Slider()
      windowWidthSlider.Minimum = 0.0
      windowWidthSlider.Maximum = Math.Pow(2, theViewer.Image.BitsPerPixel - 1)
      windowWidthSlider.Width = 400
      windowWidthSlider.Orientation = Orientation.Horizontal

      sp.Children.Add(windowWidthSlider)

      tb = New TextBlock()
      tb.HorizontalAlignment = HorizontalAlignment.Center
      tb.Text = "Window Center:"
      sp.Children.Add(tb)

      Dim windowCenterSlider As New Slider()
      windowCenterSlider.Minimum = 0.0
      windowCenterSlider.Maximum = Math.Pow(2, theViewer.Image.BitsPerPixel - 1)
      windowCenterSlider.Width = 400
      windowCenterSlider.Orientation = Orientation.Horizontal

      sp.Children.Add(windowCenterSlider)

      ' Setup the effect
      Dim effect As New WindowLevelEffect()

      ' Set the texture
      effect.FillGrayTexture(theViewer.Image)
      effect.Start = Colors.Black
      effect.End = Colors.White
      effect.CurveType = CurveType.Linear
      effect.Factor = 0.0

      effect.WindowWidth = Math.Pow(2, theViewer.Image.MaxValue - theViewer.Image.MinValue)
      effect.WindowCenter = effect.WindowWidth / 2

      theViewer.ImageEffect = effect

      ' Bind the properties
      Dim bind As New Binding()
      bind.Source = effect
      bind.UpdateSourceTrigger = UpdateSourceTrigger.Default
      bind.Path = New PropertyPath("WindowWidth")
      windowWidthSlider.SetBinding(Slider.ValueProperty, bind)

      bind = New Binding()
      bind.Source = effect
      bind.UpdateSourceTrigger = UpdateSourceTrigger.Default
      bind.Path = New PropertyPath("WindowCenter")
      windowCenterSlider.SetBinding(Slider.ValueProperty, bind)
   End Sub
End Class

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

WindowLevelEffect Members
Leadtools.Windows.Media.Effects Namespace
Introduction