Error processing SSI file
LEADTOOLS (Leadtools assembly)
Show in webframe

ChangeViewPerspectiveCommand Class








Members 
Leadtools.ImageProcessing Namespace : ChangeViewPerspectiveCommand Class
Rotates and flips the image data as necessary to achieve the desired view perspective.
Object Model
Syntax
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
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.

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
Requirements

Target Platforms

See Also

Reference

ChangeViewPerspectiveCommand Members
Leadtools.ImageProcessing Namespace

Error processing SSI file