ChangeViewPerspectiveCommand Class

Summary

Rotates and flips the image data as necessary to achieve the desired view perspective.

Syntax

Objective-C

C++/CLI

Java

Python

public class ChangeViewPerspectiveCommand : RasterCommand

@interface LTChangeViewPerspectiveCommand : LTRasterCommand

public class ChangeViewPerspectiveCommand extends RasterCommand

public ref class ChangeViewPerspectiveCommand : public RasterCommand

class ChangeViewPerspectiveCommand(RasterCommand):

Remarks

The ViewPerspective is the arrangement of pixels in the image. This command references image coordinates, which are often different from the display coordinates of an image.

Use this command to change the data and the ViewPerspective to simplify calculations that involve image coordinates. This method does not affect the image display. For more information, refer to Accounting for View Perspective.

Example

This example will load an image and then change its view perspective.

Java

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing; 
 
 
public void ChangeViewPerspectiveCommandExample() 
{ 
	RasterCodecs codecs = new RasterCodecs(); 
 
	string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp"); 
 
	// Load the source image from disk 
	RasterImage image = codecs.Load(srcFileName); 
 
	// Check the view perspective 
	Console.WriteLine("Original view perspective = {0}", image.ViewPerspective); 
 
	// If the view perspective is TopLeft, change to BottomLeft and vise versa 
	RasterViewPerspective viewPerspective = image.ViewPerspective; 
	if (viewPerspective == RasterViewPerspective.TopLeft) 
		viewPerspective = RasterViewPerspective.BottomLeft; 
	else 
		viewPerspective = RasterViewPerspective.TopLeft; 
 
	// Change the image view perspective 
	ChangeViewPerspectiveCommand command = new ChangeViewPerspectiveCommand(); 
	command.ViewPerspective = viewPerspective; 
	command.InPlace = true; 
 
	command.Run(image); 
 
	// Re-check the view perspective 
	Console.WriteLine("New view perspective = {0}", image.ViewPerspective); 
	Assert.IsTrue(image.ViewPerspective == viewPerspective); 
 
	// Clean up 
	image.Dispose(); 
	codecs.Dispose(); 
} 
 
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 changeViewPerspectiveCommandExample() { 
   final String LEAD_VARS_IMAGES_DIR = "C:\\LEADTOOLS23\\Resources\\Images"; 
   RasterCodecs codecs = new RasterCodecs(); 
   String srcFileName = combine(LEAD_VARS_IMAGES_DIR, "rgsref.cmp"); 
 
   // Load the source image from disk 
   RasterImage image = codecs.load(srcFileName); 
 
   // Check the view perspective 
   System.out.printf("Original view perspective = %s%n", image.getViewPerspective()); 
 
   // If the view perspective is TopLeft, change to BottomLeft and vise versa 
   RasterViewPerspective viewPerspective = image.getViewPerspective(); 
   if (viewPerspective == RasterViewPerspective.TOP_LEFT) 
      viewPerspective = RasterViewPerspective.BOTTOM_LEFT; 
   else 
      viewPerspective = RasterViewPerspective.TOP_LEFT; 
 
   // Change the image view perspective 
   ChangeViewPerspectiveCommand command = new ChangeViewPerspectiveCommand(); 
   command.setViewPerspective(viewPerspective); 
   command.setInPlace(true); 
 
   command.run(image); 
 
   // Re-check the view perspective 
   assertTrue(image.getViewPerspective() == viewPerspective); 
   System.out.printf("New view perspective = %s%n", image.getViewPerspective()); 
 
   // Clean up 
   image.dispose(); 
   codecs.dispose(); 
}

Requirements

Target Platforms

Reference

ChangeViewPerspectiveCommand Members

Leadtools.ImageProcessing Namespace

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Help Version 23.0.2024.5.22

Leadtools Assembly

Introduction

Getting Started

Namespaces

Leadtools Namespace

Leadtools.ImageProcessing Namespace

Assemblies