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RasterImageAnimator Class

Summary

Animates an image that has time-based frames.

Syntax
C#
VB
C++
public class RasterImageAnimator : IDisposable 
Public Class RasterImageAnimator  
   Implements System.IDisposable  
public ref class RasterImageAnimator : public System.IDisposable   

Remarks

To load and play an animated file, such as GIF, you can load the frames into a RasterImage object from the file, then play the list to a target image in a loop that displays each change in the target image. You can also create an animation sequence from scratch and save the images to create an animated GIF file.

The following is an outline of possible steps:

  1. Load a multi-frame image using Load
  2. Use the RasterImage constructor to create a target image that is the size of the images in the multi-frame image
  3. Use the RasterImageAnimator class to create an animation playback that references multi-frame image and the target image
  4. In a loop that processes each frame in the multi-frame image, do the following:

    1. Use RasterImageAnimator.Process to process the current state and get the next state of the animation
    2. Use RasterImageAnimator.GetUpdateRectangle to get the update rectangle (the portion of the target image that has changed)
    3. Use RasterImagePainter.Paint to paint the changed portion of the image. To paint only the changed portion, use the update rectangle as the source clipping rectangle.

The animation loop can have a number of states, and you should only paint the changes in an appropriate state (for example, when the next state is RasterImageAnimatorState.PostRender. For a list of possible states, refer to RasterImageAnimatorState.

The RasterImage.AnimationDisposalMethod property in the target RasterImage determines what happens to the image in the playback loop after rendering and after any wait state, when the next state is RasterImageAnimatorState.PostDispose. The options are as follows: keep the image as it is, restore the background, or restore the previous image. (Restoring the background is a common option for animation.)

The animation loop goes continuously through the list of frames. If you want to stop at the end of the list, you can exit the loop when the next state is RasterImageAnimatorState.End.

The RasterImageAnimator class also implements the IDisposable interface, it is recommended that you follow the standard .NET dispose pattern when using the RasterImageAnimator class. For more information, refer to IDisposable.

Example

This example will load an animated GIF file and paint on the surface of the given Panel.

C#
VB
using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.Drawing; 
using LeadtoolsExamples.Common; 
 
[Ignore()] 
public void RasterImageAnimatorExample(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; 
 
      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.PostClear: 
         case RasterImageAnimatorState.PostRender: 
            // 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 RasterImageAnimatorExample(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 
 
      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.PostClear, 
            RasterImageAnimatorState.PostRender 
            ' 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 

Requirements

Target Platforms

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