itkImageRandomConstIteratorWithOnlyIndex.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
 *
 *         http://www.apache.org/licenses/LICENSE-2.0.txt
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 *
 *=========================================================================*/
#ifndef itkImageRandomConstIteratorWithOnlyIndex_h
#define itkImageRandomConstIteratorWithOnlyIndex_h

#include "itkImageConstIteratorWithOnlyIndex.h"
#include "itkMersenneTwisterRandomVariateGenerator.h"

namespace itk
{
template< typename TImage >
class ITK_TEMPLATE_EXPORT ImageRandomConstIteratorWithOnlyIndex:public ImageConstIteratorWithOnlyIndex< TImage >
{
public:
  using Self = ImageRandomConstIteratorWithOnlyIndex;
  using Superclass = ImageConstIteratorWithOnlyIndex< TImage >;

  using IndexType = typename Superclass::IndexType;
  using SizeType = typename Superclass::SizeType;
  using OffsetType = typename Superclass::OffsetType;
  using RegionType = typename Superclass::RegionType;
  using ImageType = typename Superclass::ImageType;
  using IndexValueType = typename Superclass::IndexValueType;
  using OffsetValueType = typename Superclass::OffsetValueType;
  using SizeValueType = typename Superclass::SizeValueType;

  ImageRandomConstIteratorWithOnlyIndex();
  ~ImageRandomConstIteratorWithOnlyIndex() override = default;

  ImageRandomConstIteratorWithOnlyIndex(const ImageType *ptr, const RegionType & region);

  ImageRandomConstIteratorWithOnlyIndex(const ImageConstIteratorWithOnlyIndex< TImage > & it)
  {
    this->ImageConstIteratorWithOnlyIndex< TImage >::operator=(it);
  }

  void GoToBegin()
  {
    this->RandomJump();
    m_NumberOfSamplesDone = 0L;
  }

  void GoToEnd()
  {
    this->RandomJump();
    m_NumberOfSamplesDone = m_NumberOfSamplesRequested;
  }

  bool IsAtBegin() const
  {
    return ( m_NumberOfSamplesDone == 0L );
  }

  bool IsAtEnd() const
  {
    return ( m_NumberOfSamplesDone >= m_NumberOfSamplesRequested );
  }

  Self & operator++()
  {
    this->RandomJump();
    m_NumberOfSamplesDone++;
    return *this;
  }

  Self & operator--()
  {
    this->RandomJump();
    m_NumberOfSamplesDone--;
    return *this;
  }

  void SetNumberOfSamples(SizeValueType number);

  SizeValueType GetNumberOfSamples() const;

  void ReinitializeSeed();

  void ReinitializeSeed(int);

private:
  void RandomJump();

  using GeneratorPointer = typename Statistics::MersenneTwisterRandomVariateGenerator::Pointer;
  GeneratorPointer m_Generator;
  SizeValueType    m_NumberOfSamplesRequested;
  SizeValueType    m_NumberOfSamplesDone;
  SizeValueType    m_NumberOfPixelsInRegion;
};
} // end namespace itk

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

#endif