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FreeHandShearCommand Class
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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 
C++/CLI  
public ref class FreeHandShearCommand : public RasterCommand, IRasterCommand 

Example

Run the FreeHandShearCommand on an image.

Visual Basic Copy Code
Public Sub FreeHandShearCommandExample()
   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 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, LeadtoolsExamples.Common.ImagesPath.Path + "Result.jpg", RasterImageFormat.Jpeg, 24)

   RasterCodecs.Shutdown()
End Sub
C# Copy Code
public void FreeHandShearCommandExample() 
{ 
   // 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 
   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, LeadtoolsExamples.Common.ImagesPath.Path + "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