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/*=========================================================================
*
* Copyright UMC Utrecht and contributors
*
* 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 itkImageRandomSamplerBase_hxx
#define itkImageRandomSamplerBase_hxx
#include "itkImageRandomSamplerBase.h"
#include "itkMersenneTwisterRandomVariateGenerator.h"
#include "itkImageRandomConstIteratorWithIndex.h"
namespace itk
{
/**
* ******************* Constructor *******************
*/
template <class TInputImage>
ImageRandomSamplerBase<TInputImage>::ImageRandomSamplerBase()
{
this->m_NumberOfSamples = 1000;
} // end Constructor
/**
* ******************* GenerateRandomNumberList *******************
*/
template <class TInputImage>
void
ImageRandomSamplerBase<TInputImage>::GenerateRandomNumberList()
{
/** Create a random number generator. Also used in the ImageRandomConstIteratorWithIndex. */
const auto localGenerator = Statistics::MersenneTwisterRandomVariateGenerator::New();
if (m_OptionalSeed)
{
localGenerator->SetSeed(*m_OptionalSeed);
}
/** Clear the random number list. */
this->m_RandomNumberList.clear();
this->m_RandomNumberList.reserve(this->m_NumberOfSamples);
/** Fill the list with random numbers. */
const double numPixels = static_cast<double>(this->GetCroppedInputImageRegion().GetNumberOfPixels());
localGenerator->GetVariateWithOpenRange(numPixels - 0.5); // dummy jump
for (unsigned long i = 0; i < this->m_NumberOfSamples; ++i)
{
const double randomPosition = localGenerator->GetVariateWithOpenRange(numPixels - 0.5);
this->m_RandomNumberList.push_back(randomPosition);
}
}
/**
* ******************* PrintSelf *******************
*/
template <class TInputImage>
void
ImageRandomSamplerBase<TInputImage>::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf(os, indent);
os << indent << "NumberOfSamples: " << this->m_NumberOfSamples << std::endl;
} // end PrintSelf()
} // end namespace itk
#endif // end #ifndef itkImageRandomSamplerBase_hxx
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