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PolarCommand Class
See Also  Members   Example 
Leadtools.ImageProcessing.SpecialEffects Namespace : PolarCommand Class



Converts the image from rectangular to polar coordinates and vice versa. This command is available in the Raster Pro and above toolkits.

Syntax

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

Example

Convert to polar coordinate.

Visual Basic Copy Code
Public Sub PolarCommandExample()
   RasterCodecs.Startup()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.jpg")

   ' Prepare the command
   Dim command As PolarCommand = New PolarCommand
   command.FillColor = New RasterColor(0, 0, 0)
   command.Flags = PolarCommandFlags.Repeat Or PolarCommandFlags.CartToPolar
   command.Run(leadImage)
   codecs.Save(leadImage, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24)

   RasterCodecs.Shutdown()
End Sub
C# Copy Code
public void PolarCommandExample() 
{ 
   // Load an image 
   RasterCodecs.Startup(); 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(LeadtoolsExamples.Common.ImagesPath.Path + "Master.jpg"); 
 
   // Prepare the command 
   PolarCommand command   = new PolarCommand(); 
   command.FillColor      = new Leadtools.RasterColor(0,0,0); 
   command.Flags          = PolarCommandFlags.Repeat | PolarCommandFlags.CartToPolar; 
   command.Run(image); 
   codecs.Save(image, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24); 
 
   RasterCodecs.Shutdown(); 
}

Remarks

  • This command converts an image from Cartesian (rectangular) coordinates to polar coordinates or vice versa. Rectangular coordinates use the form (x, y) where 'x' and 'y' are the horizontal and vertical distances from the origin, respectively. Polar coordinates are in the form (r, E) where 'r' is the distance from the origin to the point and 'E' is the angle of the line the point makes with the positive x-axis. Polar coordinates use a grid made of concentric circles around the origin, along with lines that are rays radiating outward from the origin.
  • This command considers the positions of the image's pixels as values in a polar coordinate system. Then it converts all the pixels in a line of the image into a circle around the center of the image.
  • If there is any region selected on the image, the effect will be applied on the region dimensions only.
  • This command supports 12- and 16-bit grayscale and 48- and 64-bit color images. Support for 12- and 16-bit grayscale and 48- and 64-bit color images is available only in the Document/Medical toolkits.
  • This command does not support signed data images.
  • This command does not support 32-bit grayscale images.
For more information, refer to Introduction to Image Processing With LEADTOOLS.
For more information, refer to Applying Artistic Effects.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.SpecialEffects.PolarCommand

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also