RasterImageAnimator Class

Animates an image that has time-based frames.

Object Model

Syntax

C#
Visual Basic
WinRT C#
Objective-C
Java
WinRT JavaScript
C++

public class RasterImageAnimator : System.IDisposable

'Declaration
 
Public Class RasterImageAnimator 
   Implements System.IDisposable

'Usage
 
Dim instance As RasterImageAnimator

public sealed class RasterImageAnimator : IClosable //In WinRT the IDisposable interface is replaced by IClosable

function Leadtools.RasterImageAnimator()

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:

Load a multi-frame image using Leadtools.Codecs.RasterCodecs.Load(System.Uri,System.Int32,Leadtools.Codecs.CodecsLoadByteOrder,System.Int32,System.Int32)
Use the RasterImage constructor to create a target image that is the size of the images in the multi-frame image
Use the RasterImageAnimator class to create an animation playback that references multi-frame image and the target image
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 System.IDisposable interface, it is recommended that you follow the standard .NET dispose pattern when using the RasterImageAnimator class. For more information, refer to System.IDisposable.

Example

C#
Visual Basic
WinRT C#
WinRT JavaScript
Silverlight C#
Silverlight VB

Copy Code

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

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;
using Leadtools.Drawing;

      
      
 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();
}

using Leadtools;
using Leadtools.Codecs;
using Leadtools.ImageProcessing;

      
public async Task RasterImageAnimatorExample()
{
   // Initialize the RasterCodecs object
   RasterCodecs codecs = new RasterCodecs();
   // Load the animated GIF file
   string srcFileName = @"Assets\eye.gif";
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage animatedImage = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile));

   // 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);

   // 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

   RasterImageAnimatorState state;
   do
   {
      LeadRect srcRect = LeadRectHelper.Create(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 = LeadRectHelper.Create(0, 0, targetImage.ImageWidth, targetImage.ImageHeight);

            // Render the image here, for example, set the frame to a viewer control
            // rasterImageViewer.Image = targetImage;
            break;

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

   animator.Dispose();

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

   codecs.Dispose();
}

Requirements

Target Platforms

Reference

RasterImageAnimator Members
Leadtools Namespace