ChangeViewPerspectiveCommand Class

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

public class ChangeViewPerspectiveCommand : RasterCommand, IRasterCommand

'Declaration
 
Public Class ChangeViewPerspectiveCommand 
   Inherits RasterCommand
   Implements IRasterCommand

'Usage
 
Dim instance As ChangeViewPerspectiveCommand

public sealed class ChangeViewPerspectiveCommand : IRasterCommand

@interface LTChangeViewPerspectiveCommand : LTRasterCommand

public class ChangeViewPerspectiveCommand extends RasterCommand

function Leadtools.ImageProcessing.ChangeViewPerspectiveCommand()

public ref class ChangeViewPerspectiveCommand : public RasterCommand, IRasterCommand

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.

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

Copy Code

Imports Leadtools
  Imports Leadtools.Codecs
  Imports Leadtools.ImageProcessing

  Public Sub ChangeViewPerspectiveCommandExample()
   Dim codecs As RasterCodecs = New RasterCodecs()

   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")

   ' Load the source image from disk
   Dim image As RasterImage = 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
   Dim viewPerspective As RasterViewPerspective = image.ViewPerspective
   If viewPerspective = RasterViewPerspective.TopLeft Then
      viewPerspective = RasterViewPerspective.BottomLeft
   Else
      viewPerspective = RasterViewPerspective.TopLeft
   End If

   ' Change the image view perspective
   Dim command As ChangeViewPerspectiveCommand = New ChangeViewPerspectiveCommand()
   command.ViewPerspective = viewPerspective
   command.InPlace = True

   command.Run(image)

   ' Re-check the view perspective
   Console.WriteLine("New view perspective = {0}", image.ViewPerspective)
   Debug.Assert(image.ViewPerspective = viewPerspective)

   ' Clean up
   image.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;

      
public void ChangeViewPerspectiveCommandExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = Path.Combine(ImagesPath.Path, "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();
}

RasterCommandExamples.prototype.ChangeViewPerspectiveCommandExample = function () {
    Tools.SetLicense();
    with (Leadtools) {
        with (Leadtools.Codecs) {

            var codecs = new RasterCodecs();
            var srcFileName = "Assets\\Image1.cmp";
            var image;

            // Load the source image from disk
            return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {
                return codecs.loadAsync(LeadStreamFactory.create(loadFile), 24, CodecsLoadByteOrder.bgr, 1, 1)
            })
                .then(function (img) {
                    image = img;
                    // Check the view perspective
                    console.info("Original view perspective = ", image.viewPerspective);

                    // If the view perspective is TopLeft, change to BottomLeft and vise versa
                    var viewPerspective = image.viewPerspective;
                    if (viewPerspective == RasterViewPerspective.topLeft)
                        viewPerspective = RasterViewPerspective.bottomLeft;
                    else
                        viewPerspective = RasterViewPerspective.topLeft;

                    // Change the image view perspective
                    var command = new Leadtools.ImageProcessing.ChangeViewPerspectiveCommand();
                    command.viewPerspective = viewPerspective;
                    command.inPlace = true;

                    command.run(image);

                    // Re-check the view perspective
                    console.info("New view perspective = ", image.viewPerspective);
                    console.assert(image.viewPerspective === viewPerspective);

                    // Clean up
                    image.close();
                    codecs.close();
                });
        }
    }
}

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

      
public async Task ChangeViewPerspectiveCommandExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = @"Assets\Image1.cmp";

   // Load the source image from disk
   StorageFile loadFile = await Tools.AppInstallFolder.GetFileAsync(srcFileName);
   RasterImage image = await codecs.LoadAsync(LeadStreamFactory.Create(loadFile), 24, CodecsLoadByteOrder.Bgr, 1, 1);

   // Check the view perspective
   Debug.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
   Debug.WriteLine("New view perspective = {0}", image.ViewPerspective);
   Assert.IsTrue(image.ViewPerspective == viewPerspective);

   // Clean up
   image.Dispose();
}

using Leadtools;
using Leadtools.Codecs;
using Leadtools.Examples;
using Leadtools.ImageProcessing;
using Leadtools.Windows.Media;

public void ChangeViewPerspectiveCommandExample(RasterImage image)
{
   RasterCodecs codecs = new RasterCodecs();
   // Check the view perspective
   Debug.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
   Debug.WriteLine("New view perspective = {0}", image.ViewPerspective);
   Debug.Assert(image.ViewPerspective == viewPerspective);

   // Clean up
   image.Dispose();
}

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing
Imports Leadtools.Windows.Media

Public Sub ChangeViewPerspectiveCommandExample(ByVal image As RasterImage)
   Dim codecs As RasterCodecs = New RasterCodecs()
   ' Check the view perspective
   Debug.WriteLine("Original view perspective = {0}", image.ViewPerspective)

   ' If the view perspective is TopLeft, change to BottomLeft and vise versa
   Dim viewPerspective As RasterViewPerspective = image.ViewPerspective
   If viewPerspective = RasterViewPerspective.TopLeft Then
      viewPerspective = RasterViewPerspective.BottomLeft
   Else
      viewPerspective = RasterViewPerspective.TopLeft
   End If

   ' Change the image view perspective
   Dim command As ChangeViewPerspectiveCommand = New ChangeViewPerspectiveCommand()
   command.ViewPerspective = viewPerspective
   command.InPlace = True

   command.Run(image)

   ' Re-check the view perspective
   Debug.WriteLine("New view perspective = {0}", image.ViewPerspective)
   Debug.Assert(image.ViewPerspective = viewPerspective)

   ' Clean up
   image.Dispose()
End Sub

Target Platforms

Reference

ChangeViewPerspectiveCommand Members
Leadtools.ImageProcessing Namespace