FreeHandShearCommand Class

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

Object Model

Syntax

Visual Basic
C#
WinRT C#
WinRT JavaScript
C++

public class FreeHandShearCommand : Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

'Declaration
 
Public Class FreeHandShearCommand 
   Inherits Leadtools.ImageProcessing.RasterCommand
   Implements Leadtools.ImageProcessing.IRasterCommand

'Usage
 
Dim instance As FreeHandShearCommand

public sealed class FreeHandShearCommand : Leadtools.ImageProcessing.IRasterCommand

function Leadtools.ImageProcessing.SpecialEffects.FreeHandShearCommand()

public ref class FreeHandShearCommand : public Leadtools.ImageProcessing.RasterCommand, Leadtools.ImageProcessing.IRasterCommand

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- 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 Applying Artistic Effects.

Example

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

Public Sub FreeHandShearCommandExample()
   Dim codecs As New RasterCodecs()
   codecs.ThrowExceptionsOnInvalidImages = True

   Dim leadImage As RasterImage = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"))

   ' Prepare the command
   Dim UserPoint() As LeadPoint
   ReDim UserPoint(3)
   Dim Amplitudes() As Integer
   ReDim Amplitudes(12)

   Dim command As FreeHandShearCommand = 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).

   Dim Maximum As Integer
   Dim i As Integer
   Maximum = 0
   For i = 0 To 12
      If (Maximum < Amplitudes(i)) Then
         Maximum = Amplitudes(i)
      End If
   Next

   If (Maximum <> 0) Then
      For i = 0 To 12
         Amplitudes(i) = (1000 * Amplitudes(i) \ Math.Abs(Maximum))
      Next
   End If

   command.Amplitudes = Amplitudes
   command.Scale = 100
   command.FillColor = New RasterColor(0, 0, 0)
   command.Flags = FreeHandShearCommandFlags.Horizontal Or FreeHandShearCommandFlags.Repeat

   ' Apply the shear wave horizontally.
   command.Run(leadImage)
   codecs.Save(leadImage, Path.Combine(LEAD_VARS.ImagesDir, "Result.jpg"), RasterImageFormat.Jpeg, 24)

End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

public void FreeHandShearCommandExample()
   {
      // Load an image
      RasterCodecs codecs = new RasterCodecs();
      codecs.ThrowExceptionsOnInvalidImages = true;

      RasterImage image = codecs.Load(Path.Combine(LEAD_VARS.ImagesDir, "Master.jpg"));

      // 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:\Users\Public\Documents\LEADTOOLS Images";
}

Requirements

Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference