itkUniformRandomSpatialNeighborSubsampler.h

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 *
 *  Copyright Insight Software Consortium
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
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 *         http://www.apache.org/licenses/LICENSE-2.0.txt
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 *  distributed under the License is distributed on an "AS IS" BASIS,
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 *  See the License for the specific language governing permissions and
 *  limitations under the License.
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#ifndef __itkUniformRandomSpatialNeighborSubsampler_h
#define __itkUniformRandomSpatialNeighborSubsampler_h

#include "itkSpatialNeighborSubsampler.h"
#include "itkMersenneTwisterRandomVariateGenerator.h"

namespace itk {
namespace Statistics {
template < typename TSample, typename TRegion >
  class UniformRandomSpatialNeighborSubsampler : public SpatialNeighborSubsampler<TSample, TRegion>
{
public:
  typedef UniformRandomSpatialNeighborSubsampler<TSample, TRegion>  Self;
  typedef SpatialNeighborSubsampler<TSample, TRegion>               Superclass;
  typedef typename Superclass::Baseclass                            Baseclass;
  typedef SmartPointer<Self>                                        Pointer;
  typedef SmartPointer<const Self>                                  ConstPointer;

  itkTypeMacro(UniformRandomSpatialNeighborSubsampler, SpatialNeighborSubsampler);

  itkNewMacro(Self);

  typedef typename Superclass::SampleType                  SampleType;
  typedef typename Superclass::SampleConstPointer          SampleConstPointer;
  typedef typename Superclass::MeasurementVectorType       MeasurementVectorType;
  typedef typename Superclass::InstanceIdentifier          InstanceIdentifier;

  typedef typename Superclass::SubsampleType            SubsampleType;
  typedef typename Superclass::SubsamplePointer         SubsamplePointer;
  typedef typename Superclass::SubsampleConstIterator   SubsampleConstIterator;
  typedef typename Superclass::InstanceIdentifierHolder InstanceIdentifierHolder;
  typedef typename Baseclass::SeedType                  SeedType;

  typedef unsigned long                       SearchSizeType;
  typedef unsigned int                        RandomIntType;

  typedef typename Superclass::RadiusType      RadiusType;
  typedef typename Superclass::RegionType      RegionType;
  typedef typename Superclass::IndexType       IndexType;
  typedef typename Superclass::IndexValueType  IndexValueType;
  typedef typename Superclass::SizeType        SizeType;
  typedef typename Superclass::ImageHelperType ImageHelperType;


  typedef itk::Statistics::MersenneTwisterRandomVariateGenerator RandomGeneratorType;

  virtual void SetSeed(const SeedType seed)
  {
    Superclass::SetSeed(seed);
    this->m_RandomNumberGenerator->SetSeed(this->m_Seed);
  }

  virtual void SetUseClockForSeed(const bool& useClock)
  {
    if (useClock != this->m_UseClockForSeed)
    {
      this->m_UseClockForSeed = useClock;
      if (this->m_UseClockForSeed)
      {
        this->m_RandomNumberGenerator->SetSeed();
      }
      this->Modified();
    }
  }

  itkBooleanMacro(UseClockForSeed);
  itkGetConstMacro(UseClockForSeed, bool);

  virtual void SetNumberOfResultsRequested(const SearchSizeType& numberRequested)
  {
    itkDebugMacro("setting NumberOfResultsRequested to " << numberRequested);
    if (this->m_RequestMaximumNumberOfResults ||
        this->m_NumberOfResultsRequested != numberRequested)
    {
      this->m_NumberOfResultsRequested = numberRequested;
      this->m_RequestMaximumNumberOfResults = false;
      this->Modified();
    }
  }
  itkGetConstMacro(NumberOfResultsRequested, SearchSizeType);

  virtual void Search(const InstanceIdentifier& query,
                      SubsamplePointer& results);

protected:
  virtual typename LightObject::Pointer InternalClone() const;

  UniformRandomSpatialNeighborSubsampler();
  virtual ~UniformRandomSpatialNeighborSubsampler() {};

  virtual void PrintSelf(std::ostream& os, Indent indent) const;

  virtual RandomIntType GetIntegerVariate(RandomIntType lowerBound,
                                          RandomIntType upperBound,
                                          RandomIntType itkNotUsed(mean));

  SearchSizeType               m_NumberOfResultsRequested;
  RandomGeneratorType::Pointer m_RandomNumberGenerator;
  bool                         m_UseClockForSeed;

private:
  UniformRandomSpatialNeighborSubsampler(const Self&); // purposely not implemented
  void operator=(const Self&); // purposely not implemented

}; // end of class UniformRandomSpatialNeighborSubsampler

} // end of namespace Statistics
} // end of namespace itk

#ifndef ITK_MANUAL_INSTANTIATION
#include "itkUniformRandomSpatialNeighborSubsampler.hxx"
#endif

#endif