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itkHeavisideStepFunction.h

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00001 /*=========================================================================
00002 
00003   Program:   Insight Segmentation & Registration Toolkit
00004   Module:    $RCSfile: itkHeavisideStepFunction.h,v $
00005   Language:  C++
00006   Date:      $Date: 2009-05-09 21:06:28 $
00007   Version:   $Revision: 1.1 $
00008 
00009   Copyright (c) Insight Software Consortium. All rights reserved.
00010   See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
00011 
00012      This software is distributed WITHOUT ANY WARRANTY; without even
00013      the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
00014      PURPOSE.  See the above copyright notices for more information.
00015 
00016 =========================================================================*/
00017 
00018 #ifndef __itkHeavisideStepFunction_h
00019 #define __itkHeavisideStepFunction_h
00020 
00021 #include "itkHeavisideStepFunctionBase.h"
00022 
00023 namespace itk
00024 {
00025 
00057 template< class TInput = float, class TOutput = double >
00058 class HeavisideStepFunction : 
00059  public HeavisideStepFunctionBase< TInput, TOutput >
00060 {
00061 public:
00062   typedef HeavisideStepFunction                          Self;
00063   typedef HeavisideStepFunctionBase< TInput, TOutput >   Superclass;
00064   typedef SmartPointer<Self>                             Pointer;
00065   typedef SmartPointer<const Self>                       ConstPointer;
00066 
00067   itkNewMacro( Self );
00068  
00069   itkTypeMacro( HeavisideStepFunction, HeavisideStepFunctionBase );
00070 
00071   typedef typename Superclass::InputType                        InputType;
00072   typedef typename Superclass::OutputType                       OutputType;
00073 
00075   virtual OutputType Evaluate( const InputType& input ) const
00076     {
00077     return ( input >= 0.0 ) ? 1.0 : 0.0;
00078     }
00079 
00081   virtual OutputType EvaluateDerivative( const InputType& input ) const
00082     {
00083     return ( input == 0.0 ) ? 1.0 : 0.0;
00084     }
00085 
00086 protected:
00087   HeavisideStepFunction() {}
00088   virtual ~HeavisideStepFunction() {}
00089 
00090 private:
00091   HeavisideStepFunction(const Self& ); //purposely not implemented
00092   void operator=(const Self& ); //purposely not implemented
00093 
00094 };
00095 
00096 }
00097 
00098 #endif
00099 

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