FreeHandShearCommand Class

Summary

Shears the image by the wave drawn using the amplitudes array. This command is available in the Imaging and above toolkits.

Syntax

C++/CLI

Python

public class FreeHandShearCommand : RasterCommand

public ref class FreeHandShearCommand : public RasterCommand

class FreeHandShearCommand(RasterCommand):

Remarks

This command will shear the image using the wave in the amplitudes array. The wave can be applied vertically or horizontally. The amplitudes data can be obtained from the Leadtools.ImageProcessing.Effects.EffectsUtilities.GetCurvePoints(System.Int32[],Leadtools.LeadPoint[],Leadtools.ImageProcessing.Effects.CurvePointsType) utility method.
If the image has a region, the effect will be applied on the region 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 Applying Artistic Effects.

Free Hand Shear Function - Before

Free Hand Shear Function - After

View additional platform support for this Free Hand Shear function.

Example

Run the FreeHandShearCommand on an image.

using Leadtools; 
using Leadtools.Codecs; 
using Leadtools.ImageProcessing.SpecialEffects; 
using Leadtools.ImageProcessing.Effects; 
 
 
public void FreeHandShearCommandExample() 
{ 
   // Load an image 
   RasterCodecs codecs = new RasterCodecs(); 
   codecs.ThrowExceptionsOnInvalidImages = true; 
 
   RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "sample5.cmp")); 
 
   // Prepare the command 
   LeadPoint[] UserPoint = new LeadPoint[4]; 
   int[] Amplitudes = new int[13]; 
 
   FreeHandShearCommand command = new FreeHandShearCommand(); 
 
   // Fill apUserPoint array with points that define a triangular wave 
   UserPoint[0].X = 0; 
   UserPoint[0].Y = 0; 
   UserPoint[1].X = 3; 
   UserPoint[1].Y = 10; 
   UserPoint[2].X = 9; 
   UserPoint[2].Y = -10; 
   UserPoint[3].X = 12; 
   UserPoint[3].Y = 0; 
 
   // Draw a triangular wave according to UserPoint points and store the Amplitudes values in the Amplitudes array. 
   EffectsUtilities.GetCurvePoints(Amplitudes, UserPoint, CurvePointsType.Linear); 
 
   // Normalize Amplitudes array (maximum value in Amplitudes is 1000 and lower is -1000). 
   int Maximum, i; 
   for (Maximum = 0, i = 0; i < 13; i++) 
   { 
      if (Maximum < Amplitudes[i]) 
         Maximum = Amplitudes[i]; 
   } 
 
   if (Maximum != 0) 
   { 
      for (i = 0; i < 13; i++) 
      { 
         Amplitudes[i] = (1000 * Amplitudes[i] / Math.Abs(Maximum)); 
      } 
   } 
 
   command.Amplitudes = Amplitudes; 
   command.Scale = 100; 
   command.FillColor = new RasterColor(0, 0, 0); 
   command.Flags = FreeHandShearCommandFlags.Horizontal | FreeHandShearCommandFlags.Repeat; 
 
   // Apply the shear wave horizontally. 
   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"; 
}