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ClearUpdateRectangle Method

Summary

Clears the update rectangle used for an animation playback, leaving an empty rectangle.

Syntax

WinRT C#

C++

public void ClearUpdateRectangle()

Public Sub ClearUpdateRectangle()

public void ClearUpdateRectangle()

 function Leadtools.RasterImageAnimator.ClearUpdateRectangle()

public: 
void ClearUpdateRectangle();

Example

This example uses ClearUpdateRectangle to avoid painting odd numbered frames

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.Drawing; 
using LeadtoolsExamples.Common; 
 
[Ignore()] 
public void RasterImageAnimatorClearUpdateRectangleExample(Panel panel) 
{ 
   // Initialize the RasterCodecs object 
   RasterCodecs codecs = new RasterCodecs(); 
 
   // Load the animated GIF file 
   string fileName = Path.Combine(ImagesPath.Path, "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(); 
}

Imports Leadtools 
Imports Leadtools.Codecs 
Imports Leadtools.ImageProcessing 
Imports Leadtools.Drawing 
 
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