ClearUpdateRectangle Method

Summary

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

Syntax

Objective-C

C++/CLI

Python

public void ClearUpdateRectangle()

- (BOOL)clearUpdateRectangle:(NSError **)error;

public: 
void ClearUpdateRectangle();

def ClearUpdateRectangle(self):

Example

This example uses ClearUpdateRectangle to avoid painting odd numbered frames

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
using Leadtools.Drawing; 
 
 
 
public void RasterImageAnimatorClearUpdateRectangleExample(Panel panel) 
{ 
	// Initialize the RasterCodecs object 
	RasterCodecs codecs = new RasterCodecs(); 
 
	// Load the animated GIF file 
	string fileName = Path.Combine(LEAD_VARS.ImagesDir, "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(); 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

Requirements

Target Platforms

Reference

RasterImageAnimator Class

RasterImageAnimator Members

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Help Version 23.0.2024.2.29

Leadtools Assembly

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Getting Started

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Leadtools Namespace

Leadtools.ImageProcessing Namespace

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