freAsymmetricVariateGenerator.h

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/*=========================================================================

  Program:   F.R.E.E. - flexible registration evaluation engine
  Version:   v.1.0.0
  Date:      $Date: 2006/09/01 12:00:00 $
  Module:    $RCSfile: freAsymmetricVariateGenerator.h,v $


  Copyright (c) 2007 Ralf o Floca (Department of Medical Informatics,
  Institute for Medical Biometry and Informatics, University of Heidelberg,
  Germany). All rights reserved.
  See FREECopyright.txt or http://www.mi.med.uni-hd.de/free/copyright.htm
  for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __freAsymmetricVariateGenerator_h
#define __freAsymmetricVariateGenerator_h

#include "itkMacro.h"
#include "itkObjectFactory.h"
#include "itkRandomVariateGeneratorBase.h"

namespace itk {
namespace Statistics {

class AsymmetricVariateGenerator : 
    public RandomVariateGeneratorBase
{
public:
  
  typedef AsymmetricVariateGenerator Self ;
  typedef RandomVariateGeneratorBase Superclass;
  typedef SmartPointer<Self>   Pointer;
  typedef SmartPointer<const Self>  ConstPointer;

  itkTypeMacro(AsymmetricVariateGenerator, 
               RandomVariateGeneratorBase );
 
  itkNewMacro(Self);
    
  // Methods to reseed
  void Initialize( const int randomSeed );
  
  /* Initialize with vcl_clock time */ 
  void Initialize();  
  
  virtual double GetVariate();
     
  double operator()(); 

  itkSetMacro(Variance, double);
  itkGetMacro(Variance, double);

  itkSetMacro(Skewness, double);
  itkGetMacro(Skewness, double);

  itkSetMacro(Gamma, double);
  itkGetMacro(Gamma, double);

 protected:
  AsymmetricVariateGenerator();
  virtual ~AsymmetricVariateGenerator() {}; 
  virtual void PrintSelf(std::ostream& os, Indent indent) const;

  double m_Variance;
  double m_Skewness;
  double m_Gamma;

  double Erf(double x);
  double Freq(double x);
  double INorm(double z);
} ;  // end of class
  
} // end of namespace Statistics
} // end of namespace itk

#endif

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