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/////////////////////////////////////////////////////////////
// //
// Copyright (c) 2003-2011 by The University of Queensland //
// Earth Systems Science Computational Centre (ESSCC) //
// http://www.uq.edu.au/esscc //
// //
// Primary Business: Brisbane, Queensland, Australia //
// Licensed under the Open Software License version 3.0 //
// http://www.opensource.org/licenses/osl-3.0.php //
// //
/////////////////////////////////////////////////////////////
#include "Foundation/StringUtil.h"
#include <functional>
#include <limits>
namespace esys
{
namespace lsm
{
template <typename TmplSphere, typename TmplIdPair>
SphereNeighbours<TmplSphere,TmplIdPair>::SphereNeighbours(
double maxDist,
const BoundingBox &bBox,
const BoolVector &circDimensions
)
: m_connectionPoolPtr(new IdPairPool(4096)),
m_connectionSet(),
m_nTablePtr(),
m_minRadius(std::numeric_limits<double>::max()),
m_maxRadius(-std::numeric_limits<double>::max()),
m_maxDist(maxDist),
m_minPt(bBox.getMinPt()),
m_maxPt(bBox.getMaxPt())
{
const double gridSize =
(
max(
bBox.getSizes()[0],
max(
bBox.getSizes()[1],
bBox.getSizes()[2]
)
)
)/5.0;
m_nTablePtr =
NTablePtr(
new NTable(
bBox,
gridSize,
circDimensions,
2*gridSize
)
);
}
template <typename TmplSphere, typename TmplIdPair>
SphereNeighbours<TmplSphere,TmplIdPair>::~SphereNeighbours()
{
}
template <typename TmplSphere, typename TmplIdPair>
int SphereNeighbours<TmplSphere,TmplIdPair>::getNumSpheres() const
{
return m_nTablePtr->size();
}
template <typename TmplSphere, typename TmplIdPair>
int SphereNeighbours<TmplSphere,TmplIdPair>::getNumIdPairs() const
{
return m_connectionSet.size();
}
template <typename TmplSphere, typename TmplIdPair>
double SphereNeighbours<TmplSphere,TmplIdPair>::getMinRadius() const
{
return m_minRadius;
}
template <typename TmplSphere, typename TmplIdPair>
double SphereNeighbours<TmplSphere,TmplIdPair>::getMaxRadius() const
{
return m_maxRadius;
}
template <typename TmplSphere, typename TmplIdPair>
typename SphereNeighbours<TmplSphere,TmplIdPair>::SphereConstIterator
SphereNeighbours<TmplSphere,TmplIdPair>::getSphereIterator() const
{
return m_nTablePtr->getIterator();
}
template <typename TmplSphere, typename TmplIdPair>
const typename SphereNeighbours<TmplSphere,TmplIdPair>::IdPair &
SphereNeighbours<TmplSphere,TmplIdPair>::createIdPair(
const Sphere &p1,
const Sphere &p2
)
{
return
**(m_connectionSet.insert(
m_connectionPoolPtr->construct(p1.getId(), p2.getId())
).first);
}
template <typename TmplSphere>
class CmpSphereId
{
public:
bool operator()(const TmplSphere &p1, const TmplSphere &p2) const
{
return (p1.getId() < p2.getId());
}
bool operator()(const TmplSphere *p1, const TmplSphere *p2) const
{
return (p1->getId() < p2->getId());
}
};
template <typename TmplType>
class Deref
{
public:
typedef const TmplType& result_type;
typedef const TmplType* argument_type;
result_type
operator()(argument_type a) const
{ return *a; }
};
template <typename TmplSphere, typename TmplIdPair>
template <typename TmplSphereIterator>
typename SphereNeighbours<TmplSphere,TmplIdPair>::IdPairVector
SphereNeighbours<TmplSphere,TmplIdPair>::getNeighbours(
TmplSphereIterator it
)
{
// Put the spheres in the neighbour table
typedef std::set<Sphere *, CmpSphereId<Sphere> > SphereSet;
SphereSet pSet;
while (it.hasNext())
{
Sphere &p = it.next();
insert(p);
pSet.insert(&p);
}
ConstIdPairSet idPairSet;
// Resize ntable according to min and max sphere radii.
m_nTablePtr->resize(
getSphereBBox(),
4.1*getMinRadius(),
2.1*getMaxRadius()
);
// For each sphere in the iterator it, determine it's
// neighours within m_maxDist distance.
for (
typename SphereSet::const_iterator pIt = pSet.begin();
pIt != pSet.end();
pIt++
)
{
// get the vector of spheres which are contained in nearby cells.
typename NTable::ParticleVector nVector =
m_nTablePtr->getNeighbourVector(
(*pIt)->getPos(),
(*pIt)->getRad() + m_maxDist
);
// for each of these cell-spheres, determine if they
// are closer than m_maxDist.
for (
typename NTable::ParticleVector::const_iterator nIt = nVector.begin();
nIt != nVector.end();
nIt++
)
{
Sphere *p1 = (*pIt);
Sphere *p2 = (*nIt);
if (
(
(p1->getId() < p2->getId())
&&
(pSet.find(p1) != pSet.end())
&&
(pSet.find(p2) != pSet.end())
)
||
(
((pSet.find(p1)==pSet.end()) && (pSet.find(p2)!= pSet.end()))
||
((pSet.find(p1)!=pSet.end()) && (pSet.find(p2)== pSet.end()))
)
)
{
p1 =
((*pIt)->getId() < (*nIt)->getId())
?
(*pIt)
:
(*nIt);
p2 =
((*pIt)->getId() < (*nIt)->getId())
?
(*nIt)
:
(*pIt);
const double radiusSumPlusTol =
m_maxDist + p1->getRad() + p2->getRad();
const double radiusSumPlusTolSqrd =
radiusSumPlusTol*radiusSumPlusTol;
if (
(p1->getPos() - p2->getPos()).norm2()
<=
(radiusSumPlusTolSqrd)
)
{
idPairSet.insert(&createIdPair(*p1, *p2));
}
}
}
}
IdPairVector idPairVector;
idPairVector.reserve(idPairSet.size());
std::transform(
idPairSet.begin(),
idPairSet.end(),
std::back_insert_iterator<IdPairVector>(idPairVector),
Deref<IdPair>()
);
return idPairVector;
}
template <typename TmplSphere, typename TmplIdPair>
void
SphereNeighbours<TmplSphere,TmplIdPair>::insert(Sphere &p)
{
if (p.getRad() < m_minRadius)
{
m_minRadius = p.getRad();
}
if (p.getRad() > m_maxRadius)
{
m_maxRadius = p.getRad();
}
m_nTablePtr->insert(p);
for (int i = 0; i < 3; i++)
{
if (!(m_nTablePtr->getPeriodicDimensions()[i]))
{
if (p.getPos()[i]-p.getRad() < m_minPt[i])
{
m_minPt[i] = p.getPos()[i]-p.getRad();
}
if (p.getPos()[i]+p.getRad() > m_maxPt[i])
{
m_maxPt[i] = p.getPos()[i]+p.getRad();
}
}
}
}
template <typename TmplSphere, typename TmplIdPair>
BoundingBox
SphereNeighbours<TmplSphere,TmplIdPair>::getSphereBBox() const
{
return BoundingBox(m_minPt, m_maxPt);
}
}
}
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