Progress Event

Summary

Occurs during the image processing command, to provide status on the progress of the command.

Syntax

Objective-C

C++/CLI

Java

Python

public event EventHandler<RasterCommandProgressEventArgs> Progress

typedef void (^LTRasterCommandProgress)(NSInteger percent, BOOL *cancel) 
 
- (BOOL)run:(LTRasterImage *)image  
   progress:(nullable LTRasterCommandProgress)progressHandler  
      error:(NSError **)error

public void addProgressListener(RasterImageProgressListener listener) 
public void removeProgressListener(RasterImageProgressListener listener)

public: 
event EventHandler<RasterCommandProgressEventArgs^>^ Progress

def Progress(sender,e): # sender: RasterCommand e: RasterCommandProgressEventArgs

Event Data

The event handler receives an argument of type RasterCommandProgressEventArgs containing data related to this event. The following RasterCommandProgressEventArgs properties provide information specific to this event.

Property	Description
Cancel	Gets or sets a value indicating whether the image processing command should be canceled.

Remarks

The Progress event is fired when the Run method. RasterCommandProgressEventArgs provides data on the current progress of the image processing command. You can use this data to provide visual feedback to the user.

Example

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
 
 
public void RasterCommandExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
	string rotatedFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_rotated.bmp"); 
	string flippedFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1_flipped.bmp"); 
 
	// Load the source image from disk 
	RasterImage image = codecs.Load(srcFileName); 
 
	// flip the image 
	FlipCommand flip = new FlipCommand(false); 
	RunCommand(image, flip); 
 
	// save the image 
	codecs.Save(image, flippedFileName, RasterImageFormat.Bmp, 24); 
 
	// rotate the image by 45 degrees 
	RotateCommand rotate = new RotateCommand(); 
	rotate.Angle = 45 * 100; 
	rotate.FillColor = RasterColor.FromKnownColor(RasterKnownColor.White); 
	rotate.Flags = RotateCommandFlags.Resize; 
	RunCommand(image, rotate); 
 
	// save the image 
	codecs.Save(image, rotatedFileName, RasterImageFormat.Bmp, 24); 
 
	// clean up 
	image.Dispose(); 
	codecs.Dispose(); 
} 
 
bool cancelAt50; 
 
void RunCommand(RasterImage image, RasterCommand command) 
{ 
	// subscribe to the progress event of the command 
	command.Progress += new EventHandler<RasterCommandProgressEventArgs>(command_Progress); 
 
	// if this is a flip command, we want to stop at 50 percent 
	cancelAt50 = command is FlipCommand; 
 
	// run the command 
	command.Run(image); 
 
	command.Progress -= new EventHandler<RasterCommandProgressEventArgs>(command_Progress); 
} 
 
void command_Progress(object sender, RasterCommandProgressEventArgs e) 
{ 
	// show the percentage 
	Console.WriteLine(e.Percent); 
 
	// check if we need to cancel the command at 50% 
	if (e.Percent == 50 && cancelAt50) 
		e.Cancel = true; 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}

 
import java.io.File; 
import java.io.IOException; 
 
import org.junit.*; 
import org.junit.runner.JUnitCore; 
import org.junit.runner.Result; 
import org.junit.runner.notification.Failure; 
import static org.junit.Assert.*; 
 
import leadtools.*; 
import leadtools.codecs.*; 
import leadtools.imageprocessing.*; 
 
 
public void rasterCommandExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   RasterCodecs codecs = new RasterCodecs(); 
   String srcFileName = combine(LEAD_VARS_IMAGES_DIR, "rgsref.cmp"); 
   String rotatedFileName = combine(LEAD_VARS_IMAGES_DIR, "rgsref_rotated.bmp"); 
   String flippedFileName = combine(LEAD_VARS_IMAGES_DIR, "rgsref_flipped.bmp"); 
 
   // Load the source image from disk 
   RasterImage image = codecs.load(srcFileName); 
 
   // flip the image 
   FlipCommand flip = new FlipCommand(false); 
   runCommand(image, flip); 
 
   // save the image 
   codecs.save(image, flippedFileName, RasterImageFormat.BMP, 24); 
 
   // rotate the image by 45 degrees 
   RotateCommand rotate = new RotateCommand(); 
   rotate.setAngle(45 * 100); 
   rotate.setFillColor(RasterColor.fromKnownColor(RasterKnownColor.WHITE)); 
   rotate.setFlags(RotateCommandFlags.RESIZE.getValue()); 
   runCommand(image, rotate); 
 
   // save the image 
   codecs.save(image, rotatedFileName, RasterImageFormat.BMP, 24); 
 
   assertTrue("file unsuccessfully saved to " + rotatedFileName, (new File(rotatedFileName)).exists()); 
   System.out.printf("File saved successfully to %s%n", rotatedFileName); 
 
   // clean up 
   image.dispose(); 
   codecs.dispose(); 
} 
 
boolean cancelAt50; 
 
void runCommand(RasterImage image, RasterCommand command) { 
 
   // subscribe to the progress event of the command 
   command.addProgressListener(command_Progress); 
 
   // if this is a flip command, we want to stop at 50 percent 
   cancelAt50 = (command instanceof FlipCommand); 
 
   // run the command 
   command.run(image); 
 
   command.removeProgressListener(command_Progress); 
 
} 
 
RasterImageProgressListener command_Progress = new RasterImageProgressListener() { 
 
   @Override 
   public void RasterImageProgressAlert(RasterImageProgressEvent e) { 
      // show the percentage 
      System.out.println(e.getPercentComplete()); 
 
      // check if we need to cancel the command at 50% 
      if (e.getPercentComplete() == 50 && cancelAt50) 
         e.setCancel(true); 
   } 
 
};

Requirements

Target Platforms

Reference

RasterCommand Class

RasterCommand Members

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