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/*
//
// Copyright 2010-2012 SRI International
//
// Copyright 2010 Torsten Rohlfing
//
// This file is part of the Computational Morphometry Toolkit.
//
// http://www.nitrc.org/projects/cmtk/
//
// The Computational Morphometry Toolkit is free software: you can
// redistribute it and/or modify it under the terms of the GNU General Public
// License as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// The Computational Morphometry Toolkit is distributed in the hope that it
// will be useful, but WITHOUT ANY WARRANTY; without even the implied
// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with the Computational Morphometry Toolkit. If not, see
// <http://www.gnu.org/licenses/>.
//
// $Revision: 5436 $
//
// $LastChangedDate: 2018-12-10 19:01:20 -0800 (Mon, 10 Dec 2018) $
//
// $LastChangedBy: torstenrohlfing $
//
*/
#ifndef __cmtkRegionSphereIterator_h_included_
#define __cmtkRegionSphereIterator_h_included_
#include <cmtkconfig.h>
#include <Base/cmtkRegion.h>
#include <Base/cmtkFixedVector.h>
#include <System/cmtkSmartPtr.h>
#include <System/cmtkSmartConstPtr.h>
#include <list>
namespace
cmtk
{
/// Iterator for spherical region of n-dimensional image.
template<typename TRegion>
class RegionSphereIterator
{
public:
/// This class.
typedef RegionSphereIterator<TRegion> Self;
/// Region type.
typedef TRegion RegionType;
/// Region dimension.
static const size_t Dimension = RegionType::Dimension;
/// Region scalar type.
typedef typename RegionType::ScalarType ScalarType;
/// Index type.
typedef FixedVector<Self::Dimension,typename Self::ScalarType> IndexType;
/// Smart pointer to this class.
typedef SmartPointer<Self> SmartPtr;
/// Smart pointer-to-const to this class.
typedef SmartConstPointer<Self> SmartConstPtr;
/// Internal index list type.
typedef std::list<typename Self::IndexType> IndexListType;
protected:
/// Protected default constructor - only to be used by derived class.
RegionSphereIterator() {}
public:
/// Constructor with radius only (center is zero-index).
explicit RegionSphereIterator( const typename Self::IndexType radius /*!< Radius of the sphere in each dimension.*/ )
{
typename Self::IndexType center( typename Self::IndexType::Init( 0 ) );
this->Populate( radius, center, 0, 1.0 );
}
/// Constructor with radius and (not necessarily) non-zero center
explicit RegionSphereIterator( const typename Self::IndexType radius /*!< Radius of the sphere in each dimension.*/, const typename Self::IndexType center /*!< Center index of the sphere. */ )
{
this->Populate( radius, center, 0, 1.0 );
}
/// Increment operator.
typename Self::IndexListType::const_iterator& operator++()
{
return ++this->m_IndexListIterator;
}
/// Get index.
const typename Self::IndexType& Index() const
{
return *(this->m_IndexListIterator);
}
/// Iterator assignment.
const Self& operator=( const typename Self::IndexListType::const_iterator& it )
{
this->m_IndexListIterator = it;
return *this;
}
/// Region "begin" index.
const typename Self::IndexListType::const_iterator begin() const
{
return this->m_IndexList.begin();
}
/// Region "end" index.
const typename Self::IndexListType::const_iterator end() const
{
return this->m_IndexList.end();
}
/// Equality operator.
bool operator==( const typename Self::IndexListType::const_iterator& it )
{
return it == this->m_IndexListIterator;
}
/// Inequality operator.
bool operator!=( const typename Self::IndexListType::const_iterator& it )
{
return it != this->m_IndexListIterator;
}
protected:
/// Pre-computed list of grid indexes on the sphere.
typename Self::IndexListType m_IndexList;
/// Current position in index list.
typename Self::IndexListType::const_iterator m_IndexListIterator;
/// Recursively populate the list of indexes.
virtual void Populate( const typename Self::IndexType& radius /*!< Sphere radius in index steps by dimension.*/, const typename Self::IndexType& center /*!< Sphere center. */, const size_t dim /*!< Next dimension. */,
const double remainSquare /*!< Remaining proportion of total squared sphere radius. */)
{
if ( remainSquare >= 0 )
{
typename Self::IndexType index = center;
const int radiusThisDimension = static_cast<int>( sqrt( remainSquare ) * radius[dim] );
if ( dim < Self::Dimension )
{
this->Populate( radius, index, dim+1, remainSquare );
for ( int r = 1; r <= radiusThisDimension; ++r )
{
const double newRemainSquare = remainSquare - MathUtil::Square(1.0 * r / radius[dim] );
index[dim] = center[dim]+r;
this->Populate( radius, index, dim+1, newRemainSquare );
index[dim] = center[dim]-r;
this->Populate( radius, index, dim+1, newRemainSquare );
}
}
else
{
this->m_IndexList.push_back( center );
}
}
}
};
} // namespace cmtk
#endif // #ifndef __cmtkRegionSphereIterator_h_included_
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