PolarCommand Class

Summary

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

Syntax

C++/CLI

Python

public class PolarCommand : RasterCommand

public ref class PolarCommand : public RasterCommand

class PolarCommand(RasterCommand):

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-bit and 16-bit grayscale and 48-bit and 64-bit color images. Support for 12-bit and 16-bit grayscale and 48-bit 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.

Polar Function - Before

Polar Function - After

View additional platform support for this Polar function.

Example

Convert to polar coordinate.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.SpecialEffects; 
 
 
public void PolarCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "sample5.cmp")); 
 
   // 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, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24); 
 
} 
 
static class LEAD_VARS 
{ 
   public const string ImagesDir = @"C:\LEADTOOLS23\Resources\Images"; 
}