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LEADTOOLS (Leadtools assembly)
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Append Method (RasterImageAnimator)








Leadtools Namespace > RasterImageAnimator Class : Append Method
A RasterImage that contains 1 or more frames to be added to the animation.
Appends an image to the animated multi-frame image during an animation playback.
Syntax
public void Append( 
   RasterImage image
)
'Declaration
 

Public Sub Append( _
   ByVal image As RasterImage _
) 
'Usage
 

Dim instance As RasterImageAnimator
Dim image As RasterImage
 
instance.Append(image)
public void Append( 
   RasterImage image
)
 function Leadtools.RasterImageAnimator.Append( 
   image 
)

public:
void Append( 
   RasterImage^ image
)

Parameters

image
A RasterImage that contains 1 or more frames to be added to the animation.
Remarks

If you pass null (Nothing in VisualBasic) in the animatedImage parameter for the RasterImageAnimator constructor, you can use the Append method to add frames to the multi-frame image during the animation. This is useful if you want to play an animated file as it is being loaded using the LoadImage event. If you need to reference the multi-frame image after the animation, you can call the Destroy method before you dispose this RasterImageAnimator object.

After you call Destroy, this RasterImageAnimator object is invalid and you should only call the Dispose method afterwards.

The ValidateLines method lets you validate the lines that the animation playback engine will render to the target image

Example

This example plays an animated GIF file as it loads the file

Copy Code   
Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.Drawing

Private _animator As RasterImageAnimator
Private _targetImage As RasterImage
Private _graphics As Graphics
Private _destRect As LeadRect
Private _paintProperties As RasterPaintProperties
Sub RasterImageAppendExample(ByVal panel As Panel)
   ' Initialize the RasterCodecs object
   Dim codecs As New RasterCodecs()

   ' An animated GIF file
   Dim fileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Eye.gif")

   ' load the first frame, so we have the palette and a target image for playback
   _targetImage = codecs.Load(fileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1)

   ' Create the animator
   _animator = New RasterImageAnimator(_targetImage, Nothing)

   ' Setup our class members used in the event handler
   _graphics = panel.CreateGraphics()
   _destRect = LeadRect.FromLTRB(panel.ClientRectangle.Left, panel.ClientRectangle.Top, panel.ClientRectangle.Right, panel.ClientRectangle.Bottom)
   _paintProperties = RasterPaintProperties.Default
   _paintProperties.PaintEngine = RasterPaintEngine.GdiPlus

   ' Hook to the LoadImage event and load the file
   AddHandler codecs.LoadImage, AddressOf codecs_LoadImage
   codecs.Load(fileName)
   RemoveHandler codecs.LoadImage, AddressOf codecs_LoadImage

   _graphics.Dispose()
   _animator.Dispose()
   _animator = Nothing

   _targetImage.Dispose()

   codecs.Dispose()
End Sub

Sub codecs_LoadImage(ByVal sender As Object, ByVal e As CodecsLoadImageEventArgs)
   If ((e.Flags And CodecsLoadImageFlags.FirstRow) = CodecsLoadImageFlags.FirstRow) Then
      _animator.Append(e.Image)
   End If

   _animator.ValidateLines(e.Row, e.Lines)

   Dim state As RasterImageAnimatorState = _animator.State

   Do While (state <> RasterImageAnimatorState.End)
      state = _animator.Process()

      Dim updateRect As LeadRect

      Select Case (state)
         Case RasterImageAnimatorState.WaitInput
            _animator.CancelWait()

         Case RasterImageAnimatorState.PostClear, _
            RasterImageAnimatorState.PostRender
            updateRect = _animator.GetUpdateRectangle(True)
            RasterImagePainter.Paint(_targetImage, _graphics, LeadRect.Empty, updateRect, _destRect, LeadRect.Empty, _paintProperties)
      End Select

      Exit Do
   Loop
End Sub

Public NotInheritable Class LEAD_VARS
Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.Drawing;

RasterImageAnimator _animator;
RasterImage _targetImage;
Graphics _graphics;
LeadRect _destRect;
RasterPaintProperties _paintProperties;
      
      
public void RasterImageAppendExample(Panel panel)
{
   // Initialize the RasterCodecs object
   RasterCodecs codecs = new RasterCodecs();

   // An animated GIF file
   string fileName = Path.Combine(ImagesPath.Path, "Eye.gif");

   // load the first frame, so we have the palette and a target image for playback
   _targetImage = codecs.Load(fileName, 0, CodecsLoadByteOrder.BgrOrGray, 1, 1);

   // Create the animator
   _animator = new RasterImageAnimator(_targetImage, null);

   // Setup our class members used in the event handler
   _graphics = panel.CreateGraphics();
   _destRect = LeadRect.FromLTRB(panel.ClientRectangle.Left, panel.ClientRectangle.Top, panel.ClientRectangle.Right, panel.ClientRectangle.Bottom);
   _paintProperties = RasterPaintProperties.Default;
   _paintProperties.PaintEngine = RasterPaintEngine.GdiPlus;

   // Hook to the LoadImage event and load the file
   codecs.LoadImage += new EventHandler<CodecsLoadImageEventArgs>(codecs_LoadImage);
   codecs.Load(fileName);
   codecs.LoadImage -= new EventHandler<CodecsLoadImageEventArgs>(codecs_LoadImage);

   _graphics.Dispose();
   _animator.Dispose();
   _animator = null;

   _targetImage.Dispose();

   codecs.Dispose();
}

void codecs_LoadImage(object sender, CodecsLoadImageEventArgs e)
{
   if((e.Flags & CodecsLoadImageFlags.FirstRow) == CodecsLoadImageFlags.FirstRow)
      _animator.Append(e.Image);

   _animator.ValidateLines(e.Row, e.Lines);

   RasterImageAnimatorState state = _animator.State;

   while(state != RasterImageAnimatorState.End)
   {
      state = _animator.Process();

      LeadRect updateRect;

      switch(state)
      {
         case RasterImageAnimatorState.WaitInput:
            _animator.CancelWait();
            break;

         case RasterImageAnimatorState.PostClear:
         case RasterImageAnimatorState.PostRender:
            updateRect = _animator.GetUpdateRectangle(true);
            RasterImagePainter.Paint(_targetImage, _graphics, LeadRect.Empty, updateRect, _destRect, LeadRect.Empty, _paintProperties);
            break;
      }

      break;
   }
}
using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;

RasterImageAnimator _animator;
RasterImage _targetImage;
LeadRect _destRect;
      
public async Task RasterImageAppendExample()
{
   // Initialize the RasterCodecs object
   RasterCodecs codecs = new RasterCodecs();

   // An animated GIF file
   string srcFileName = @"Assets\Eye.gif";

   // load the first frame, so we have the palette and a target image for playback
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage _targetImage = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile), 0, CodecsLoadByteOrder.BgrOrGray, 1, 1);

   // Create the animator
   _animator = new RasterImageAnimator(_targetImage, null);

   // Setup our class members used in the event handler
   _destRect = LeadRectHelper.FromLTRB(0, 0, 400, 400);

   // Hook to the LoadImage event and load the file
   codecs.LoadImage += new EventHandler<CodecsLoadImageEventArgs>(codecs_LoadImage);
   loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));
   codecs.LoadImage -= new EventHandler<CodecsLoadImageEventArgs>(codecs_LoadImage);

   _animator.Dispose();
   _animator = null;

   _targetImage.Dispose();

   codecs.Dispose();
}

void codecs_LoadImage(object sender, CodecsLoadImageEventArgs e)
{
   if ((e.Flags & CodecsLoadImageFlags.FirstRow) == CodecsLoadImageFlags.FirstRow)
      _animator.Append(e.Image);

   _animator.ValidateLines(e.Row, e.Lines);

   RasterImageAnimatorState state = _animator.State;

   while (state != RasterImageAnimatorState.End)
   {
      state = _animator.Process();

      LeadRect updateRect;

      switch (state)
      {
         case RasterImageAnimatorState.WaitInput:
            _animator.CancelWait();
            break;

         case RasterImageAnimatorState.PostClear:
         case RasterImageAnimatorState.PostRender:
            updateRect = _animator.GetUpdateRectangle(true);
            // Render the image here, for example, set the frame to a viewer control
            // rasterImageViewer.Image = _targetImage;
            break;
      }

      break;
   }
}
Requirements

Target Platforms

See Also

Reference

RasterImageAnimator Class
RasterImageAnimator Members

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