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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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 itkImageRandomConstIteratorWithIndex_hxx
#define itkImageRandomConstIteratorWithIndex_hxx
namespace itk
{
template <typename TImage>
ImageRandomConstIteratorWithIndex<TImage>::ImageRandomConstIteratorWithIndex(const ImageType * ptr,
const RegionType & region)
: ImageConstIteratorWithIndex<TImage>(ptr, region)
, m_NumberOfPixelsInRegion{ region.GetNumberOfPixels() }
{}
template <typename TImage>
void
ImageRandomConstIteratorWithIndex<TImage>::ReinitializeSeed()
{
m_Generator->SetSeed();
}
template <typename TImage>
void
ImageRandomConstIteratorWithIndex<TImage>::ReinitializeSeed(int seed)
{
m_Generator->SetSeed(seed);
// vnl_sample_reseed(seed);
}
template <typename TImage>
void
ImageRandomConstIteratorWithIndex<TImage>::RandomJump()
{
using PositionValueType = IndexValueType;
auto position = static_cast<PositionValueType>(
m_Generator->GetVariateWithOpenRange(static_cast<double>(m_NumberOfPixelsInRegion) - 0.5));
const SizeType regionSize = this->m_Region.GetSize();
for (unsigned int dim = 0; dim < TImage::ImageDimension; ++dim)
{
const SizeValueType sizeInThisDimension = regionSize[dim];
const PositionValueType residual = position % sizeInThisDimension;
this->m_PositionIndex[dim] = residual + this->m_BeginIndex[dim];
position -= residual;
position /= sizeInThisDimension;
}
this->m_Position = this->m_Image->GetBufferPointer() + this->m_Image->ComputeOffset(this->m_PositionIndex);
}
} // end namespace itk
#endif
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