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ChangeViewPerspectiveCommand Class

Summary
Rotates and flips the image data as necessary to achieve the desired view perspective.
Syntax
C#
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.

C#
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:\LEADTOOLS22\Resources\Images"; 
} 
Requirements

Target Platforms

Help Version 22.0.2023.5.16
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© 1991-2023 LEAD Technologies, Inc. All Rights Reserved.