Public Sub ClearUpdateRectangle() 

Dim instance As RasterImageAnimator
 
instance.ClearUpdateRectangle()

public void ClearUpdateRectangle()

public:
void ClearUpdateRectangle(); 

Sub RasterImageAnimatorClearUpdateRectangleExample(ByVal panel As Panel)
      ' Initialize the RasterCodecs object
      Dim codecs As New RasterCodecs()
      ' Load the animated GIF file
      Dim fileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif")
      Dim animatedImage As RasterImage = codecs.Load(fileName)

      ' Create the target image, we want it to be in the animated image size
      Dim targetImage As New RasterImage( _
         RasterMemoryFlags.Conventional, _
         animatedImage.AnimationGlobalSize.Width, _
         animatedImage.AnimationGlobalSize.Height, _
         animatedImage.BitsPerPixel, _
         animatedImage.Order, _
         animatedImage.ViewPerspective, _
         Nothing, _
         IntPtr.Zero, _
         0)

      ' Copy the palette from the animated image to this newly created image
      animatedImage.CopyPaletteTo(targetImage)

      ' Create the RasterImageAnimator object
      Dim animator As New RasterImageAnimator(targetImage, animatedImage)

      ' Animate it

      ' Use GDI+ paint engine to support transparent colors
      Dim props As RasterPaintProperties = RasterPaintProperties.Default
      props.PaintEngine = RasterPaintEngine.GdiPlus

      Dim g As Graphics = panel.CreateGraphics()

      Dim state As RasterImageAnimatorState

      Do
         Dim srcRect As New LeadRect(0, 0, targetImage.ImageWidth, targetImage.ImageHeight)
         Dim updateRect As LeadRect
         Dim destRect As LeadRect
         Dim index As Integer

         state = animator.Process()

         Select Case (state)
            Case RasterImageAnimatorState.WaitDelay, _
               RasterImageAnimatorState.WaitInputDelay, _
               RasterImageAnimatorState.Render
               ' Continue processing

            Case RasterImageAnimatorState.WaitInput
               ' In case the animated image has the "wait for user input" flags,
               ' cancel the waiting
               animator.CancelWait()

            Case RasterImageAnimatorState.PostRender
               index = animator.Index
               If ((index Mod 2) <> 0) Then
                  animator.ClearUpdateRectangle()
               End If

               ' Get the area in the target image that has changed
               updateRect = animator.GetUpdateRectangle(True)

               ' Paint it
               destRect = New LeadRect(0, 0, targetImage.ImageWidth, targetImage.ImageHeight)

               RasterImagePainter.Paint(targetImage, g, srcRect, updateRect, destRect, destRect, props)
         End Select
      Loop While (state <> RasterImageAnimatorState.End)

      g.Dispose()

      animator.Dispose()

      targetImage.Dispose()
      animatedImage.Dispose()

      codecs.Dispose()
   End Sub

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

public void RasterImageAnimatorClearUpdateRectangleExample(Panel panel)
   {
      // Initialize the RasterCodecs object
      RasterCodecs codecs = new RasterCodecs();

      // Load the animated GIF file
      string fileName = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif");
      RasterImage animatedImage = codecs.Load(fileName);

      // Create the target image, we want it to be in the animated image size
      RasterImage targetImage = new RasterImage(
         RasterMemoryFlags.Conventional,
         animatedImage.AnimationGlobalSize.Width,
         animatedImage.AnimationGlobalSize.Height,
         animatedImage.BitsPerPixel,
         animatedImage.Order,
         animatedImage.ViewPerspective,
         null,
         IntPtr.Zero,
         0);

      // Copy the palette from the animated image to this newly created image
      animatedImage.CopyPaletteTo(targetImage);

      // Create the RasterImageAnimator object
      RasterImageAnimator animator = new RasterImageAnimator(targetImage, animatedImage);

      // Animate it

      // Use GDI+ paint engine to support transparent colors
      RasterPaintProperties props = RasterPaintProperties.Default;
      props.PaintEngine = RasterPaintEngine.GdiPlus;

      Graphics g = panel.CreateGraphics();

      RasterImageAnimatorState state;
      do
      {
         LeadRect srcRect = new LeadRect(0, 0, targetImage.ImageWidth, targetImage.ImageHeight);
         LeadRect updateRect;
         LeadRect destRect;
         int index;

         state = animator.Process();

         switch(state)
         {
            case RasterImageAnimatorState.WaitDelay:
            case RasterImageAnimatorState.WaitInputDelay:
            case RasterImageAnimatorState.Render:
               // Continue processing
               break;

            case RasterImageAnimatorState.WaitInput:
               // In case the animated image has the "wait for user input" flags,
               // cancel the waiting
               animator.CancelWait();
               break;

            case RasterImageAnimatorState.PostRender:
               index = animator.Index;
               if((index % 2) != 0)
                  animator.ClearUpdateRectangle();

               // Get the area in the target image that has changed
               updateRect = animator.GetUpdateRectangle(true);

               // Paint it
               destRect = new LeadRect(0, 0, targetImage.ImageWidth, targetImage.ImageHeight);

               RasterImagePainter.Paint(targetImage, g, srcRect, updateRect, destRect, destRect, props);
               break;

            default:
               break;
         }
      }
      while(state != RasterImageAnimatorState.End);

      g.Dispose();

      animator.Dispose();

      targetImage.Dispose();
      animatedImage.Dispose();

      codecs.Dispose();
   }

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