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Append Method

Summary

Appends an image to the animated multi-frame image during an animation playback.

Syntax
C#
VB
C++
public void Append( 
   RasterImage image 
) 
Public Sub Append( _ 
   ByVal image As RasterImage _ 
)  
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

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.Drawing; 
using LeadtoolsExamples.Common; 
 
RasterImageAnimator _animator; 
RasterImage _targetImage; 
Graphics _graphics; 
LeadRect _destRect; 
RasterPaintProperties _paintProperties; 
 
[Ignore()] 
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; 
   } 
} 
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 

Requirements

Target Platforms

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