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RotateCommand Class
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Leadtools.ImageProcessing Namespace : RotateCommand Class



Rotates an RasterImage by the number of degrees specified.

Syntax

Visual Basic (Declaration) 
Public Class RotateCommand 
   Inherits RasterCommand
   Implements IRasterCommand 
Visual Basic (Usage)Copy Code
Dim instance As RotateCommand
C# 
public class RotateCommand : RasterCommand, IRasterCommand 
C++/CLI 
public ref class RotateCommand : public RasterCommand, IRasterCommand 

Remarks

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 1-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 multiple of 90. (ie when 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’s palette). If the rotation doesn’t 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 don not have a palette. Grayscale image can have a palette if they have been loaded from certain DICOM images. 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.

You can also rotate an image rapidly by an increment of 90 degrees by using RasterImage.RotateViewPerspective

For more information, refer to Introduction to Image Processing With LEADTOOLS.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.RotateCommand

Requirements

Target Platforms: Microsoft .NET CF Framework 2.0, Windows Mobile 5 PocketPC, Windows Mobile 5 Smartphone, Windows Mobile 6

See Also