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




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

Syntax

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

Example

Visual BasicCopy Code
ImageProcessing.SpecialEffects.FreeHandShearCommand
   Public Sub FreeHandShearCommandExample()
      RasterCodecs.Startup()
      Dim codecs As New RasterCodecs()
      codecs.ThrowExceptionsOnInvalidImages = True

      Dim leadImage As RasterImage = codecs.Load("C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Master.jpg")

      ' Prepare the command
      Dim UserPoint() As Point
      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, "C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Result.jpg", RasterImageFormat.Jpeg, 24)

      RasterCodecs.Shutdown()
   End Sub
C#Copy Code
ImageProcessing.SpecialEffects.FreeHandShearCommand 
      public void FreeHandShearCommandExample() 
      { 
         // Load an image 
         RasterCodecs.Startup(); 
         RasterCodecs codecs = new RasterCodecs(); 
         codecs.ThrowExceptionsOnInvalidImages = true; 
 
         RasterImage image = codecs.Load(@"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Master.jpg"); 
 
         // Prepare the command 
         Point[] UserPoint = new Point[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, @"C:\Program Files\LEAD Technologies\LEADTOOLS 15\Images\Result.jpg", RasterImageFormat.Jpeg, 24); 
 
         RasterCodecs.Shutdown(); 
      }

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 GetCurvePoints 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.

Inheritance Hierarchy

System.Object
   Leadtools.ImageProcessing.RasterCommand
      Leadtools.ImageProcessing.SpecialEffects.FreeHandShearCommand

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