RotateCommand Class

This command has the following features:

• It uses the center of the image as the center of rotation.
• It can rotate the image clockwise or counterclockwise up to 360 degrees in 100th-degree increments.
• It can resize the image to accommodate the rotated height and width, or it can retain the original height and width, cropping the image as necessary.
• It uses FillColor as the background color to fill any new area created by the rotation.

RotateCommandFlags.Resample and RotateCommandFlags.Bicubic can be combined with RotateCommandFlags.Resize, but they can not be combined with each other.

If RotateCommandFlags.Resize is set, then the image is resized. Otherwise, the image is cropped.

Interpolation can be done while rotating certain images. This produces superior output, eliminating the jaggedness occurring when rotating images at angles that are not multiples of 90. (ie when RotateCommand.Angle is not a multiple of 9000).

The only images that are interpolated are:

• 8-bit grayscale images (for best results, all gray values should be in the image palette). If the rotation does not give the expected results, you can use GrayscaleCommand with GrayscaleCommand.BitsPerPixel = 8 to change the image into a proper grayscale image.
• 12-bit and 16-bit grayscale images that do not have a palette. Grayscale image can have a palette if they have been loaded from certain DICOM images or if the WindowLevelCommand has been used. Use GrayscaleCommand with GrayscaleCommand.BitsPerPixel = 12 or GrayscaleCommand with GrayscaleCommand.BitsPerPixel = 16 if RotateCommand does not seem to do any interpolation during the rotation.
• 16-bit color images
• 24-bit, 32-bit, 48-bit and 64-bit color images

For all other images, RotateCommand ignores the resampling flags and the rotate is performed without interpolation.

For more information, refer to Processing an Image.

This example will load an image, rotate it by 45 degrees and then save it back to disk

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

Copy Code  

Imports Leadtools
Imports Leadtools.Codecs
Imports Leadtools.ImageProcessing

      
Public Sub RotateCommandExample()
   Dim codecs As RasterCodecs = New RasterCodecs()
   Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
   Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "RotateCommand.bmp")

   ' Load the source image from disk
   Dim image As RasterImage = codecs.Load(srcFileName)

   ' Rotate the image by 45 degrees
   Dim command As RotateCommand = New RotateCommand()
   command.Angle = 45 * 100
   command.FillColor = New RasterColor(255, 255, 255)
   command.Flags = RotateCommandFlags.Bicubic
   command.Run(image)

   ' Save it to disk
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24)

   ' 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 RotateCommandExample()
{
   RasterCodecs codecs = new RasterCodecs();
   string srcFileName = Path.Combine(ImagesPath.Path, "Image1.cmp");
   string destFileName = Path.Combine(ImagesPath.Path, "RotateCommand.bmp");

   // Load the source image from disk
   RasterImage image = codecs.Load(srcFileName);

   // Rotate the image by 45 degrees
   RotateCommand command = new RotateCommand();
   command.Angle = 45 * 100;
   command.FillColor = new RasterColor(255, 255, 255);
   command.Flags = RotateCommandFlags.Bicubic;
   command.Run(image);

   // Save it to disk
   codecs.Save(image, destFileName, RasterImageFormat.Bmp, 24);

   // Clean Up
   image.Dispose();
   codecs.Dispose();
}

RasterCommandExamples.prototype.RotateCommandExample = function ( ) 
{
    Tools.SetLicense ( ) ;
    with ( Leadtools ) { with ( Leadtools.Codecs ) { with ( Leadtools.ImageProcessing ) {
        var codecs = new RasterCodecs();

        var srcFileName = "Assets\\Image1.cmp";
        var destFileName = "RotateCommand.bmp";
        var image ;
        // Load the source image from disk
        return Tools.AppInstallFolder().getFileAsync(srcFileName)
        .then ( function ( loadFile ) {
            return codecs.loadAsync(LeadStreamFactory.create(loadFile))})
        .then ( function ( img ) {
            image = img ;

            // Rotate the image by 45 degrees
            var command = new RotateCommand();
            command.angle = 45 * 100;
            command.fillColor = RasterColorHelper.create(255, 255, 255);
            command.flags = RotateCommandFlags.bicubic;
            command.run(image);

            // Save it to disk
            return Tools.AppLocalFolder().createFileAsync(destFileName)})
        .then ( function ( saveFile ) {
            return codecs.saveAsync(image, LeadStreamFactory.create(saveFile), RasterImageFormat.bmp, 24)})
        .then ( function ( ) {
            // Clean Up
            image.close();
            codecs.close ( ) ;
        });
    }
    }
    }
}

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

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

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

   // Rotate the image by 45 degrees
   RotateCommand command = new RotateCommand();
   command.Angle = 45 * 100;
   command.FillColor = RasterColorHelper.Create(255, 255, 255);
   command.Flags = RotateCommandFlags.Bicubic;
   command.Run(image);

   // Save it to disk
   StorageFile saveFile = await Tools.AppLocalFolder.CreateFileAsync(destFileName);
   await codecs.SaveAsync(image, LeadStreamFactory.Create(saveFile), RasterImageFormat.Bmp, 24);

   // Clean Up
   image.Dispose();
}

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

public void RotateCommandExample(RasterImage image, Stream destStream)
{
   RasterCodecs codecs = new RasterCodecs();
   // Rotate the image by 45 degrees
   RotateCommand command = new RotateCommand();
   command.Angle = 45 * 100;
   command.FillColor = new RasterColor(255, 255, 255);
   command.Flags = RotateCommandFlags.Bicubic;
   command.Run(image);

   // Save it to disk
   codecs.Save(image, destStream, RasterImageFormat.Bmp, 24);

   // Clean Up
   image.Dispose();
}

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

Public Sub RotateCommandExample(ByVal image As RasterImage, ByVal destStream As Stream)
   Dim codecs As RasterCodecs = New RasterCodecs()
   ' Rotate the image by 45 degrees
   Dim command As RotateCommand = New RotateCommand()
   command.Angle = 45 * 100
   command.FillColor = New RasterColor(255, 255, 255)
   command.Flags = RotateCommandFlags.Bicubic
   command.Run(image)

   ' Save it to disk
   codecs.Save(image, destStream, RasterImageFormat.Bmp, 24)

   ' Clean Up
   image.Dispose()
End Sub

Target Platforms

Reference

RotateCommand Members
Leadtools.ImageProcessing Namespace