Refactoring QuadraticPlanar precision tuning. Fixes intersector bugs.

[tools/medcoupling.git] / src / MEDCoupling / MEDCouplingPointSet.cxx

// Copyright (C) 2007-2016  CEA/DEN, EDF R&D
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
//
// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//
// Author : Anthony Geay (CEA/DEN)

#include "MEDCouplingPointSet.hxx"
#include "MCAuto.hxx"
#include "MEDCoupling1GTUMesh.hxx"
#include "MEDCouplingUMesh.hxx"
#include "MEDCouplingMemArray.hxx"
#include "PlanarIntersector.txx"
#include "InterpKernelGeo2DQuadraticPolygon.hxx"
#include "InterpKernelGeo2DNode.hxx"
#include "DirectedBoundingBox.hxx"
#include "InterpKernelAutoPtr.hxx"

#include <cmath>
#include <limits>
#include <numeric>
#include <sstream>

using namespace MEDCoupling;

MEDCouplingPointSet::MEDCouplingPointSet():_coords(0)
{
}

MEDCouplingPointSet::MEDCouplingPointSet(const MEDCouplingPointSet& other, bool deepCpy):MEDCouplingMesh(other),_coords(0)
{
  if(other._coords)
    _coords=other._coords->performCopyOrIncrRef(deepCpy);
}

MEDCouplingPointSet::~MEDCouplingPointSet()
{
  if(_coords)
    _coords->decrRef();
}

int MEDCouplingPointSet::getNumberOfNodes() const
{
  if(_coords)
    return _coords->getNumberOfTuples();
  else
    throw INTERP_KERNEL::Exception("Unable to get number of nodes because no coordinates specified !");
}

int MEDCouplingPointSet::getSpaceDimension() const
{
  if(_coords)
    return _coords->getNumberOfComponents();
  else
    throw INTERP_KERNEL::Exception("Unable to get space dimension because no coordinates specified !");
}

void MEDCouplingPointSet::updateTime() const
{
  if(_coords)
    {
      updateTimeWith(*_coords);
    }
}

std::size_t MEDCouplingPointSet::getHeapMemorySizeWithoutChildren() const
{
  return MEDCouplingMesh::getHeapMemorySizeWithoutChildren();
}

std::vector<const BigMemoryObject *> MEDCouplingPointSet::getDirectChildrenWithNull() const
{
  std::vector<const BigMemoryObject *> ret;
  ret.push_back(_coords);
  return ret;
}

void MEDCouplingPointSet::setCoords(const DataArrayDouble *coords)
{
  if( coords != _coords )
    {
      if (_coords)
        _coords->decrRef();
      _coords=const_cast<DataArrayDouble *>(coords);
      if(_coords)
        _coords->incrRef();
      declareAsNew();
    }
}

/*!
 * Returns a pointer to the array of point coordinates held by \a this.
 *  \return DataArrayDouble * - the pointer to the array of point coordinates. The
 *          caller is to delete this array using decrRef() as it is no more needed.
 */
DataArrayDouble *MEDCouplingPointSet::getCoordinatesAndOwner() const
{
  if(_coords)
    _coords->incrRef();
  return _coords;
}

/*!
 * Copies string attributes from an \a other mesh. The copied strings are
 * - mesh name
 * - mesh description
 * - time units
 * - textual data of the coordinates array (name and components info)
 *
 *  \param [in] other - the mesh to copy string attributes from.
 */
void MEDCouplingPointSet::copyTinyStringsFrom(const MEDCouplingMesh *other)
{
  MEDCouplingMesh::copyTinyStringsFrom(other);
  const MEDCouplingPointSet *otherC=dynamic_cast<const MEDCouplingPointSet *>(other);
  if(!otherC)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::copyTinyStringsFrom : meshes have not same type !");
  if(_coords && otherC->_coords)
    _coords->copyStringInfoFrom(*otherC->_coords);
}

bool MEDCouplingPointSet::isEqualIfNotWhy(const MEDCouplingMesh *other, double prec, std::string& reason) const
{
  if(!other)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::isEqualIfNotWhy : null mesh instance in input !");
  const MEDCouplingPointSet *otherC=dynamic_cast<const MEDCouplingPointSet *>(other);
  if(!otherC)
    {
      reason="mesh given in input is not castable in MEDCouplingPointSet !";
      return false;
    }
  if(!MEDCouplingMesh::isEqualIfNotWhy(other,prec,reason))
    return false;
  if(!areCoordsEqualIfNotWhy(*otherC,prec,reason))
    return false;
  return true;
}

/*!
 * Checks equality of point coordinates with coordinates of an \a other mesh.
 *        None textual data is considered.
 *  \param [in] other - the mesh to compare coordinates with \a this one.
 *  \param [in] prec - precision value to compare coordinates.
 *  \return bool - \a true if coordinates of points are equal, \a false else.
 */
bool MEDCouplingPointSet::isEqualWithoutConsideringStr(const MEDCouplingMesh *other, double prec) const
{
  const MEDCouplingPointSet *otherC=dynamic_cast<const MEDCouplingPointSet *>(other);
  if(!otherC)
    return false;
  if(!areCoordsEqualWithoutConsideringStr(*otherC,prec))
    return false;
  return true;
}

bool MEDCouplingPointSet::areCoordsEqualIfNotWhy(const MEDCouplingPointSet& other, double prec, std::string& reason) const
{
  if(_coords==0 && other._coords==0)
    return true;
  if(_coords==0 || other._coords==0)
    {
      reason="Only one PointSet between the two this and other has coordinate defined !";
      return false;
    }
  if(_coords==other._coords)
    return true;
  bool ret=_coords->isEqualIfNotWhy(*other._coords,prec,reason);
  if(!ret)
    reason.insert(0,"Coordinates DataArray do not match : ");
  return ret;
}

/*!
 * Checks equality of point coordinates with \a other point coordinates.
 *        Textual data (name and components info) \b is compared as well.
 *  \param [in] other - the point coordinates to compare with \a this one.
 *  \param [in] prec - precision value to compare coordinates.
 *  \return bool - \a true if coordinates of points are equal, \a false else.
 */
bool MEDCouplingPointSet::areCoordsEqual(const MEDCouplingPointSet& other, double prec) const
{
  std::string tmp;
  return areCoordsEqualIfNotWhy(other,prec,tmp);
}

/*!
 * Checks equality of point coordinates with \a other point coordinates.
 *        None textual data is considered.
 *  \param [in] other - the point coordinates to compare with \a this one.
 *  \param [in] prec - precision value to compare coordinates.
 *  \return bool - \a true if coordinates of points are equal, \a false else.
 */
bool MEDCouplingPointSet::areCoordsEqualWithoutConsideringStr(const MEDCouplingPointSet& other, double prec) const
{
  if(_coords==0 && other._coords==0)
    return true;
  if(_coords==0 || other._coords==0)
    return false;
  if(_coords==other._coords)
    return true;
  return _coords->isEqualWithoutConsideringStr(*other._coords,prec);
}

/*!
 * Returns coordinates of \a nodeId-th node.
 *  \param [in] nodeId - the ID of the node of interest.
 *  \param [in, out] coo - the array filled with coordinates of the \a nodeId-th
 *         node. This array is not cleared before filling in, the coordinates are
 *         appended to its end.
 *  \throw If the coordinates array is not set.
 *  \throw If \a nodeId is not a valid index for the coordinates array.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcpointset_getcoordinatesofnode "Here is a C++ example".<br>
 *  \ref  py_mcpointset_getcoordinatesofnode "Here is a Python example".
 *  \endif
 */
void MEDCouplingPointSet::getCoordinatesOfNode(int nodeId, std::vector<double>& coo) const
{
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::getCoordinatesOfNode : no coordinates array set !");
  int nbNodes=getNumberOfNodes();
  if(nodeId>=0 && nodeId<nbNodes)
    {
      const double *cooPtr=_coords->getConstPointer();
      int spaceDim=getSpaceDimension();
      coo.insert(coo.end(),cooPtr+spaceDim*nodeId,cooPtr+spaceDim*(nodeId+1));
    }
  else
    {
      std::ostringstream oss; oss << "MEDCouplingPointSet::getCoordinatesOfNode : request of nodeId \"" << nodeId << "\" but it should be in [0,"<< nbNodes << ") !";
      throw INTERP_KERNEL::Exception(oss.str().c_str());
    }
}

/*!
 * Finds nodes equal within \a precision and returns an array describing the 
 * permutation to remove duplicated nodes.
 *  \param [in] precision - minimal absolute distance between two nodes at which they are
 *              considered not coincident.
 *  \param [in] limitNodeId - limit node id. If all nodes within a group of coincident
 *              nodes have id strictly lower than \a limitTupleId then they are not
 *              returned. Put -1 to this parameter to have all nodes returned.
 *  \param [out] areNodesMerged - is set to \a true if any coincident nodes found.
 *  \param [out] newNbOfNodes - returns number of unique nodes.
 *  \return DataArrayInt * - the permutation array in "Old to New" mode. For more 
 *          info on "Old to New" mode see \ref numbering. The caller
 *          is to delete this array using decrRef() as it is no more needed.
 *  \throw If the coordinates array is not set.
 */
DataArrayInt *MEDCouplingPointSet::buildPermArrayForMergeNode(double precision, int limitNodeId, bool& areNodesMerged, int& newNbOfNodes) const
{
  DataArrayInt *comm,*commI;
  findCommonNodes(precision,limitNodeId,comm,commI);
  int oldNbOfNodes=getNumberOfNodes();
  MCAuto<DataArrayInt> ret=buildNewNumberingFromCommonNodesFormat(comm,commI,newNbOfNodes);
  areNodesMerged=(oldNbOfNodes!=newNbOfNodes);
  comm->decrRef();
  commI->decrRef();
  return ret.retn();
}

/*!
 * Finds nodes coincident within \a prec tolerance.
 * Ids of coincident nodes are stored in output arrays in the \ref numbering-indirect format.
 *  \param [in] prec - minimal absolute distance (using infinite norm) between two nodes at which they are
 *              considered not coincident.
 *  \param [in] limitNodeId - limit node id. If all nodes within a group of coincident
 *              nodes have id strictly lower than \a limitTupleId then they are not
 *              returned. Put -1 to this parameter to have all nodes treated.
 *  \param [out] comm - the array holding ids of coincident nodes.
 *               \a comm->getNumberOfComponents() == 1. 
 *               \a comm->getNumberOfTuples() == \a commIndex->back(). The caller
 *               is to delete this array using decrRef() as it is no more needed.
 *  \param [out] commIndex - the array dividing all ids stored in \a comm into
 *               groups of (ids of) coincident nodes (\ref numbering-indirect). Its every value is a tuple
 *               index where a next group of nodes begins. For example the second
 *               group of nodes in \a comm is described by following range of indices:
 *               [ \a commIndex[1], \a commIndex[2] ). \a commIndex->getNumberOfTuples()-1
 *               gives the number of groups of coincident nodes. The caller
 *               is to delete this array using decrRef() as it is no more needed.
 *  \throw If the coordinates array is not set.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcpointset_findcommonnodes "Here is a C++ example".<br>
 *  \ref  py_mcpointset_findcommonnodes "Here is a Python example".
 *  \endif
 */
void MEDCouplingPointSet::findCommonNodes(double prec, int limitNodeId, DataArrayInt *&comm, DataArrayInt *&commIndex) const
{
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::findCommonNodes : no coords specified !");
  _coords->findCommonTuples(prec,limitNodeId,comm,commIndex);
}

/*!
 * Finds nodes located at distances lower that \a eps from a given point.
 *  \param [in] pos - pointer to coordinates of the point.  This array is expected to
 *         be of length \a this->getSpaceDimension() at least, else the
 *         behavior is not warranted.
 *  \param [in] eps - the lowest distance between a point and a node (using infinite norm) at which the node is
 *          not returned by this method.
 *  \return DataArrayInt * - a new instance of DataArrayInt holding ids of nodes
 *          close to the point. The caller is to delete this
 *          array using decrRef() as it is no more needed.
 *  \throw If the coordinates array is not set.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcpointset_getnodeidsnearpoint "Here is a C++ example".<br>
 *  \ref  py_mcpointset_getnodeidsnearpoint "Here is a Python example".
 *  \endif
 */
DataArrayInt *MEDCouplingPointSet::getNodeIdsNearPoint(const double *pos, double eps) const
{
  DataArrayInt *c=0,*cI=0;
  getNodeIdsNearPoints(pos,1,eps,c,cI);
  MCAuto<DataArrayInt> cITmp(cI);
  return c;
}

/*!
 * Finds nodes located at distances lower that \a eps from given points.
 *  \param [in] pos - pointer to coordinates of the points. This array is expected to
 *         be of length \a nbOfPoints * \a this->getSpaceDimension() at least, else the
 *         behavior is not warranted.
 *  \param [in] nbOfPoints - number of points whose coordinates are given by \a pos
 *         parameter. 
 *  \param [in] eps - the lowest distance between (using infinite norm) a point and a node at which the node is
 *         not returned by this method.
 *  \param [out] c - array (\ref numbering-indirect) returning ids of nodes located closer than \a eps to the
 *         given points. The caller
 *         is to delete this array using decrRef() as it is no more needed.
 *  \param [out] cI - for each i-th given point, the array specifies tuples of \a c
 *         holding ids of nodes close to the i-th point (\ref numbering-indirect). <br>The i-th value of \a cI is an
 *         index of tuple of \a c holding id of a first (if any) node close to the
 *         i-th given point. Difference between the i-th and (i+1)-th value of \a cI
 *         (i.e. \a cI[ i+1 ] - \a cI[ i ]) defines number of nodes close to the i-th
 *         point (that can be zero!). For example, the group of nodes close to the
 *         second point is described by following range of indices [ \a cI[1], \a cI[2] ).
 *         The caller is to delete this array using decrRef() as it is no more needed.
 *  \throw If the coordinates array is not set.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcpointset_getnodeidsnearpoints "Here is a C++ example".<br>
 *  \ref  py_mcpointset_getnodeidsnearpoints "Here is a Python example".
 *  \endif
 */
void MEDCouplingPointSet::getNodeIdsNearPoints(const double *pos, int nbOfPoints, double eps, DataArrayInt *& c, DataArrayInt *& cI) const
{
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::getNodeIdsNearPoint : no coordiantes set !");
  int spaceDim=getSpaceDimension();
  MCAuto<DataArrayDouble> points=DataArrayDouble::New();
  points->useArray(pos,false,CPP_DEALLOC,nbOfPoints,spaceDim);
  _coords->computeTupleIdsNearTuples(points,eps,c,cI);
}

/*!
 * @param comm in param in the same format than one returned by findCommonNodes method (\ref numbering-indirect).
 * @param commI in param in the same format than one returned by findCommonNodes method (\ref numbering-indirect).
 * @return the old to new correspondance array.
 */
DataArrayInt *MEDCouplingPointSet::buildNewNumberingFromCommonNodesFormat(const DataArrayInt *comm, const DataArrayInt *commIndex,
                                                                          int& newNbOfNodes) const
{
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::buildNewNumberingFromCommonNodesFormat : no coords specified !");
  return DataArrayInt::ConvertIndexArrayToO2N(getNumberOfNodes(),comm->begin(),commIndex->begin(),commIndex->end(),newNbOfNodes);
}

/*!
 * Permutes and possibly removes nodes as specified by \a newNodeNumbers array.
 * If \a newNodeNumbers[ i ] < 0 then the i-th node is removed, 
 * else \a newNodeNumbers[ i ] is a new id of the i-th node. The nodal connectivity
 * array is modified accordingly.
 *  \param [in] newNodeNumbers - a permutation array, of length \a
 *         this->getNumberOfNodes(), in "Old to New" mode. 
 *         See \ref numbering for more info on renumbering modes.
 *  \param [in] newNbOfNodes - number of nodes remaining after renumbering.
 *  \throw If the coordinates array is not set.
 *  \throw If the nodal connectivity of cells is not defined.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcumesh_renumberNodes "Here is a C++ example".<br>
 *  \ref  py_mcumesh_renumberNodes "Here is a Python example".
 *  \endif
 */
void MEDCouplingPointSet::renumberNodes(const int *newNodeNumbers, int newNbOfNodes)
{
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::renumberNodes : no coords specified !");
  MCAuto<DataArrayDouble> newCoords=_coords->renumberAndReduce(newNodeNumbers,newNbOfNodes);
  renumberNodesInConn(newNodeNumbers);
  setCoords(newCoords);//let it here not before renumberNodesInConn because old number of nodes is sometimes used...
}

/*!
 * Permutes and possibly removes nodes as specified by \a newNodeNumbers array.
 * If \a newNodeNumbers[ i ] < 0 then the i-th node is removed, 
 * else \a newNodeNumbers[ i ] is a new id of the i-th node. The nodal connectivity
 * array is modified accordingly. In contrast to renumberNodes(), location
 * of merged nodes (whose new ids coincide) is changed to be at their barycenter.
 *  \param [in] newNodeNumbers - a permutation array, of length \a
 *         this->getNumberOfNodes(), in "Old to New" mode. 
 *         See \ref numbering for more info on renumbering modes.
 *  \param [in] newNbOfNodes - number of nodes remaining after renumbering, which is
 *         actually one more than the maximal id in \a newNodeNumbers.
 *  \throw If the coordinates array is not set.
 *  \throw If the nodal connectivity of cells is not defined.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcumesh_renumberNodes "Here is a C++ example".<br>
 *  \ref  py_mcumesh_renumberNodes "Here is a Python example".
 *  \endif
 */
void MEDCouplingPointSet::renumberNodesCenter(const int *newNodeNumbers, int newNbOfNodes)
{
  DataArrayDouble *newCoords=DataArrayDouble::New();
  std::vector<int> div(newNbOfNodes);
  int spaceDim=getSpaceDimension();
  newCoords->alloc(newNbOfNodes,spaceDim);
  newCoords->copyStringInfoFrom(*_coords);
  newCoords->fillWithZero();
  int oldNbOfNodes=getNumberOfNodes();
  double *ptToFill=newCoords->getPointer();
  const double *oldCoordsPtr=_coords->getConstPointer();
  for(int i=0;i<oldNbOfNodes;i++)
    {
      std::transform(oldCoordsPtr+i*spaceDim,oldCoordsPtr+(i+1)*spaceDim,ptToFill+newNodeNumbers[i]*spaceDim,
                     ptToFill+newNodeNumbers[i]*spaceDim,std::plus<double>());
      div[newNodeNumbers[i]]++;
    }
  for(int i=0;i<newNbOfNodes;i++)
    ptToFill=std::transform(ptToFill,ptToFill+spaceDim,ptToFill,std::bind2nd(std::multiplies<double>(),1./(double)div[i]));
  setCoords(newCoords);
  newCoords->decrRef();
  renumberNodesInConn(newNodeNumbers);
}

/*!
 * Computes the minimum box bounding all nodes. The edges of the box are parallel to
 * the Cartesian coordinate axes. The bounding box is described by coordinates of its
 * two extremum points with minimal and maximal coordinates.
 *  \param [out] bbox - array filled with coordinates of extremum points in "no
 *         interlace" mode, i.e. xMin, xMax, yMin, yMax, zMin, zMax (if in 3D). This
 *         array, of length 2 * \a this->getSpaceDimension() at least, is to be
 *         pre-allocated by the caller.
 *  \throw If the coordinates array is not set.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcpointset_getBoundingBox "Here is a C++ example".<br>
 *  \ref  py_mcpointset_getBoundingBox "Here is a Python example".
 *  \endif
 */
void MEDCouplingPointSet::getBoundingBox(double *bbox) const
{
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::getBoundingBox : Coordinates not set !");
  _coords->getMinMaxPerComponent(bbox);
}

/*!
 * Removes "free" nodes, i.e. nodes not used to define any element.
 *  \throw If the coordinates array is not set.
 *  \throw If the elements are not defined.
 */
void MEDCouplingPointSet::zipCoords()
{
  checkFullyDefined();
  DataArrayInt *traducer=zipCoordsTraducer();
  traducer->decrRef();
}

/*! \cond HIDDEN_ITEMS */
struct MEDCouplingCompAbs
{
  bool operator()(double x, double y) { return std::abs(x)<std::abs(y);}
};
/*! \endcond */

/*!
 * Returns the carateristic dimension of \a this point set, that is a maximal
 * absolute values of node coordinates.
 *  \throw If the coordinates array is not set.
 */
double MEDCouplingPointSet::getCaracteristicDimension() const
{
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::getCaracteristicDimension : Coordinates not set !");
  const double *coords=_coords->getConstPointer();
  int nbOfValues=_coords->getNbOfElems();
  return std::abs(*std::max_element(coords,coords+nbOfValues,MEDCouplingCompAbs()));
}

/*!
 * This method recenter coordinates of nodes in \b this in order to be centered at the origin to benefit about the advantages of the precision to be around the box
 * around origin of 'radius' 1.
 *
 * \warning this method is non const and alterates coordinates in \b this without modifying.
 * \param [in] eps absolute epsilon. under that value of delta between max and min no scale is performed.
 *
 */
void MEDCouplingPointSet::recenterForMaxPrecision(double eps)
{
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::recenterForMaxPrecision : Coordinates not set !");
  _coords->recenterForMaxPrecision(eps);
  updateTime();
}

/*!
 * Rotates \a this set of nodes by \a angle around either an axis (in 3D) or a point
 * (in 2D). 
 *  \param [in] center - coordinates either of an origin of rotation axis (in 3D) or
 *         of center of rotation (in 2D). This array is to be of size \a
 *         this->getSpaceDimension() at least.
 *  \param [in] vector - 3 components of a vector defining direction of the rotation
 *         axis in 3D. In 2D this parameter is not used.
 *  \param [in] angle - the rotation angle in radians.
 *  \throw If the coordinates array is not set.
 *  \throw If \a this->getSpaceDimension() != 2 && \a this->getSpaceDimension() != 3.
 *  \throw If \a center == NULL
 *  \throw If \a vector == NULL && \a this->getSpaceDimension() == 3.
 *  \throw If Magnitude of \a vector is zero.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcpointset_rotate "Here is a C++ example".<br>
 *  \ref  py_mcpointset_rotate "Here is a Python example".
 *  \endif
 */
void MEDCouplingPointSet::rotate(const double *center, const double *vector, double angle)
{
  int spaceDim=getSpaceDimension();
  if(spaceDim==3)
    rotate3D(center,vector,angle);
  else if(spaceDim==2)
    rotate2D(center,angle);
  else
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::rotate : invalid space dim for rotation must be 2 or 3");
  _coords->declareAsNew();
  updateTime();
}

/*!
 * Translates \a this set of nodes. 
 *  \param [in] vector - components of a translation vector. This array is to be of
 *         size \a this->getSpaceDimension() at least. 
 *  \throw If the coordinates array is not set.
 *  \throw If \a vector == NULL.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcpointset_translate "Here is a C++ example".<br>
 *  \ref  py_mcpointset_translate "Here is a Python example".
 *  \endif
 */
void MEDCouplingPointSet::translate(const double *vector)
{
  if(!vector)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::translate : NULL input vector !");
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::translate : no coordinates set !");
  double *coords=_coords->getPointer();
  int nbNodes=getNumberOfNodes();
  int dim=getSpaceDimension();
  for(int i=0; i<nbNodes; i++)
    for(int idim=0; idim<dim;idim++)
      coords[i*dim+idim]+=vector[idim];
  _coords->declareAsNew();
  updateTime();
}


/*!
 * Applies scaling transformation to \a this set of nodes. 
 *  \param [in] point - coordinates of a scaling center. This array is to be of
 *         size \a this->getSpaceDimension() at least.
 *  \param [in] factor - a scale factor.
 *  \throw If the coordinates array is not set.
 *  \throw If \a point == NULL.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcpointset_scale "Here is a C++ example".<br>
 *  \ref  py_mcpointset_scale "Here is a Python example".
 *  \endif
 */
void MEDCouplingPointSet::scale(const double *point, double factor)
{
  if(!point)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::scale : NULL input point !");
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::scale : no coordinates set !");
  double *coords=_coords->getPointer();
  int nbNodes=getNumberOfNodes();
  int dim=getSpaceDimension();
  for(int i=0;i<nbNodes;i++)
    {
      std::transform(coords+i*dim,coords+(i+1)*dim,point,coords+i*dim,std::minus<double>());
      std::transform(coords+i*dim,coords+(i+1)*dim,coords+i*dim,std::bind2nd(std::multiplies<double>(),factor));
      std::transform(coords+i*dim,coords+(i+1)*dim,point,coords+i*dim,std::plus<double>());
    }
  _coords->declareAsNew();
  updateTime();
}

/*!
 * Converts \a this set of points to an other dimension by changing number of
 * components of point coordinates. If the dimension increases, added components
 * are filled with \a dftValue. If the dimension decreases, last components are lost.
 * If the new dimension is same as \a this->getSpaceDimension(), nothing is done.
 *  \param [in] newSpaceDim - the new space dimension.
 *  \param [in] dftValue - the value to assign to added components of point coordinates
 *         (if the dimension increases).
 *  \throw If the coordinates array is not set.
 *  \throw If \a newSpaceDim < 1.
 */
void MEDCouplingPointSet::changeSpaceDimension(int newSpaceDim, double dftValue)
{
  if(getCoords()==0)
    throw INTERP_KERNEL::Exception("changeSpaceDimension must be called on an MEDCouplingPointSet instance with coordinates set !");
  if(newSpaceDim<1)
    throw INTERP_KERNEL::Exception("changeSpaceDimension must be called a newSpaceDim >=1 !");
  int oldSpaceDim=getSpaceDimension();
  if(newSpaceDim==oldSpaceDim)
    return ;
  DataArrayDouble *newCoords=getCoords()->changeNbOfComponents(newSpaceDim,dftValue);
  setCoords(newCoords);
  newCoords->decrRef();
  updateTime();
}

/*!
 * Substitutes \a this->_coords with \a other._coords provided that coordinates of
 * the two point sets match with a specified precision, else an exception is thrown.
 *  \param [in] other - the other point set whose coordinates array will be used by
 *         \a this point set in case of their equality.
 *  \param [in] epsilon - the precision used to compare coordinates.
 *  \throw If the coordinates array of \a this is not set.
 *  \throw If the coordinates array of \a other is not set.
 *  \throw If the coordinates of \a this and \a other do not match.
 */
void MEDCouplingPointSet::tryToShareSameCoords(const MEDCouplingPointSet& other, double epsilon)
{
  if(_coords==other._coords)
    return ;
  if(!_coords)
    throw INTERP_KERNEL::Exception("Current instance has no coords whereas other has !");
  if(!other._coords)
    throw INTERP_KERNEL::Exception("Other instance has no coords whereas current has !");
  if(!_coords->isEqualWithoutConsideringStr(*other._coords,epsilon))
    throw INTERP_KERNEL::Exception("Coords are not the same !");
  setCoords(other._coords);
}

/*!
 * This method duplicates the nodes whose ids are in [\b nodeIdsToDuplicateBg, \b nodeIdsToDuplicateEnd) and put the result of their duplication at the end
 * of existing node ids.
 * 
 * \param [in] nodeIdsToDuplicateBg begin of node ids (included) to be duplicated in connectivity only
 * \param [in] nodeIdsToDuplicateEnd end of node ids (excluded) to be duplicated in connectivity only
 */
void MEDCouplingPointSet::duplicateNodesInCoords(const int *nodeIdsToDuplicateBg, const int *nodeIdsToDuplicateEnd)
{
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::duplicateNodesInCoords : no coords set !");
  MCAuto<DataArrayDouble> newCoords=_coords->selectByTupleIdSafe(nodeIdsToDuplicateBg,nodeIdsToDuplicateEnd);
  MCAuto<DataArrayDouble> newCoords2=DataArrayDouble::Aggregate(_coords,newCoords);
  setCoords(newCoords2);
}

/*!
 * Finds nodes located at distance lower that \a eps from a specified plane.
 *  \param [in] pt - 3 components of a point defining location of the plane.
 *  \param [in] vec - 3 components of a normal vector to the plane. Vector magnitude
 *         must be greater than 10*\a eps.
 *  \param [in] eps - maximal distance of a node from the plane at which the node is
 *         considered to lie on the plane.
 *  \param [in,out] nodes - a vector returning ids of found nodes. This vector is not
 *         cleared before filling in.
 *  \throw If the coordinates array is not set.
 *  \throw If \a pt == NULL.
 *  \throw If \a vec == NULL.
 *  \throw If the magnitude of \a vec is zero.
 *  \throw If \a this->getSpaceDimension() != 3.
 */
void MEDCouplingPointSet::findNodesOnPlane(const double *pt, const double *vec, double eps, std::vector<int>& nodes) const
{
  if(getSpaceDimension()!=3)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::findNodesOnPlane : Invalid spacedim to be applied on this ! Must be equal to 3 !");
  if(!pt)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::findNodesOnPlane : NULL point pointer specified !");
  if(!vec)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::findNodesOnPlane : NULL vector pointer specified !");
  int nbOfNodes=getNumberOfNodes();
  double a=vec[0],b=vec[1],c=vec[2],d=-pt[0]*vec[0]-pt[1]*vec[1]-pt[2]*vec[2];
  double deno=sqrt(a*a+b*b+c*c);
  if(deno<std::numeric_limits<double>::min())
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::findNodesOnPlane : vector pointer specified has norm equal to 0. !");
  const double *work=_coords->getConstPointer();
  for(int i=0;i<nbOfNodes;i++)
    {
      if(std::abs(a*work[0]+b*work[1]+c*work[2]+d)/deno<eps)
        nodes.push_back(i);
      work+=3;
    }
}

/*!
 * Finds nodes located at distance lower that \a eps from a specified line in 2D and 3D.
 *  \param [in] pt - components of coordinates of an initial point of the line. This
 *         array is to be of size \a this->getSpaceDimension() at least.
 *  \param [in] vec - components of a vector defining the line direction. This array
 *         is to be of size \a this->getSpaceDimension() at least. Vector magnitude 
 *         must be greater than 10*\a eps.
 *  \param [in] eps - maximal distance of a node from the line at which the node is
 *         considered to lie on the line.
 *  \param [in,out] nodes - a vector returning ids of found nodes. This vector is not
 *         cleared before filling in.
 *  \throw If the coordinates array is not set.
 *  \throw If \a pt == NULL.
 *  \throw If \a vec == NULL.
 *  \throw If the magnitude of \a vec is zero.
 *  \throw If ( \a this->getSpaceDimension() != 3 && \a this->getSpaceDimension() != 2 ).
 */
void MEDCouplingPointSet::findNodesOnLine(const double *pt, const double *vec, double eps, std::vector<int>& nodes) const
{
  int spaceDim=getSpaceDimension();
  if(spaceDim!=2 && spaceDim!=3)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::findNodesOnLine : Invalid spacedim to be applied on this ! Must be equal to 2 or 3 !");
  if(!pt)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::findNodesOnLine : NULL point pointer specified !");
  if(!vec)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::findNodesOnLine : NULL vector pointer specified !");
  int nbOfNodes=getNumberOfNodes();
  double den=0.;
  for(int i=0;i<spaceDim;i++)
    den+=vec[i]*vec[i];
  double deno=sqrt(den);
  if(deno<10.*eps)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::findNodesOnLine : Invalid given direction vector ! Norm is too small !");
  INTERP_KERNEL::AutoPtr<double> vecn=new double[spaceDim];
  for(int i=0;i<spaceDim;i++)
    vecn[i]=vec[i]/deno;
  const double *work=_coords->getConstPointer();
  if(spaceDim==2)
    {
      for(int i=0;i<nbOfNodes;i++)
        {
          if(std::abs(vecn[0]*(work[1]-pt[1])-vecn[1]*(work[0]-pt[0]))<eps)
            nodes.push_back(i);
          work+=2;
        }
    }
  else
    {
      for(int i=0;i<nbOfNodes;i++)
        {
          double a=vecn[0]*(work[1]-pt[1])-vecn[1]*(work[0]-pt[0]);
          double b=vecn[1]*(work[2]-pt[2])-vecn[2]*(work[1]-pt[1]);
          double c=vecn[2]*(work[0]-pt[0])-vecn[0]*(work[2]-pt[2]);
          if(std::sqrt(a*a+b*b+c*c)<eps)
            nodes.push_back(i);
          work+=3;
        }
    }
}

/*!
 * Returns a new array of node coordinates by concatenating node coordinates of two
 * given point sets, so that (1) the number of nodes in the result array is a sum of the
 * number of nodes of given point sets and (2) the number of component in the result array
 * is same as that of each of given point sets. Info on components is copied from the first
 * of the given point set. Space dimension of the given point sets must be the same. 
 *  \param [in] m1 - a point set whose coordinates will be included in the result array.
 *  \param [in] m2 - another point set whose coordinates will be included in the
 *         result array. 
 *  \return DataArrayDouble * - the new instance of DataArrayDouble.
 *          The caller is to delete this result array using decrRef() as it is no more
 *          needed.
 *  \throw If both \a m1 and \a m2 are NULL.
 *  \throw If \a m1->getSpaceDimension() != \a m2->getSpaceDimension().
 */
DataArrayDouble *MEDCouplingPointSet::MergeNodesArray(const MEDCouplingPointSet *m1, const MEDCouplingPointSet *m2)
{
  int spaceDim=m1->getSpaceDimension();
  if(spaceDim!=m2->getSpaceDimension())
    throw INTERP_KERNEL::Exception("Mismatch in SpaceDim during call of MergeNodesArray !");
  return DataArrayDouble::Aggregate(m1->getCoords(),m2->getCoords());
}

DataArrayDouble *MEDCouplingPointSet::MergeNodesArray(const std::vector<const MEDCouplingPointSet *>& ms)
{
  if(ms.empty())
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::MergeNodesArray : input array must be NON EMPTY !");
  std::vector<const MEDCouplingPointSet *>::const_iterator it=ms.begin();
  std::vector<const DataArrayDouble *> coo(ms.size());
  int spaceDim=(*it)->getSpaceDimension();
  coo[0]=(*it++)->getCoords();
  if(!coo[0]->isAllocated())
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::MergeNodesArray : first element in coordinates is not allocated !");
  for(int i=1;it!=ms.end();it++,i++)
    {
      const DataArrayDouble *tmp=(*it)->getCoords();
      if(tmp)
        {
          if(tmp->isAllocated())
            {
              if((*it)->getSpaceDimension()==spaceDim)
                coo[i]=tmp;
              else
                throw INTERP_KERNEL::Exception("MEDCouplingPointSet::MergeNodesArray : Mismatch in SpaceDim !");
            }
          else
            throw INTERP_KERNEL::Exception("MEDCouplingPointSet::MergeNodesArray : Presence of a non allocated array !");
        }
      else
        throw INTERP_KERNEL::Exception("MEDCouplingPointSet::MergeNodesArray : Empty coords detected !");
    }
  return DataArrayDouble::Aggregate(coo);
}

/*!
 * Factory to build new instance of instanciable subclasses of MEDCouplingPointSet.
 * This method is used during unserialization process.
 */
MEDCouplingPointSet *MEDCouplingPointSet::BuildInstanceFromMeshType(MEDCouplingMeshType type)
{
  switch(type)
    {
    case UNSTRUCTURED:
      return MEDCouplingUMesh::New();
    case SINGLE_STATIC_GEO_TYPE_UNSTRUCTURED:
      return MEDCoupling1SGTUMesh::New();
    case SINGLE_DYNAMIC_GEO_TYPE_UNSTRUCTURED:
      return MEDCoupling1DGTUMesh::New();
    default:
      throw INTERP_KERNEL::Exception("Invalid type of mesh specified");
    }
}

/*!
 * First step of serialization process. Used by ParaMEDMEM and MEDCouplingCorba to transfert data between process.
 */
void MEDCouplingPointSet::getTinySerializationInformation(std::vector<double>& tinyInfoD, std::vector<int>& tinyInfo, std::vector<std::string>& littleStrings) const
{
  int it,order;
  double time=getTime(it,order);
  if(_coords)
    {
      int spaceDim=getSpaceDimension();
      littleStrings.resize(spaceDim+4);
      littleStrings[0]=getName();
      littleStrings[1]=getDescription();
      littleStrings[2]=_coords->getName();
      littleStrings[3]=getTimeUnit();
      for(int i=0;i<spaceDim;i++)
        littleStrings[i+4]=getCoords()->getInfoOnComponent(i);
      tinyInfo.clear();
      tinyInfo.push_back(getType());
      tinyInfo.push_back(spaceDim);
      tinyInfo.push_back(getNumberOfNodes());
      tinyInfo.push_back(it);
      tinyInfo.push_back(order);
      tinyInfoD.push_back(time);
    }
  else
    {
      littleStrings.resize(3);
      littleStrings[0]=getName();
      littleStrings[1]=getDescription();
      littleStrings[2]=getTimeUnit();
      tinyInfo.clear();
      tinyInfo.push_back(getType());
      tinyInfo.push_back(-1);
      tinyInfo.push_back(-1);
      tinyInfo.push_back(it);
      tinyInfo.push_back(order);
      tinyInfoD.push_back(time);
    }
}

/*!
 * Third and final step of serialization process.
 */
void MEDCouplingPointSet::serialize(DataArrayInt *&a1, DataArrayDouble *&a2) const
{
  if(_coords)
    {
      a2=const_cast<DataArrayDouble *>(getCoords());
      a2->incrRef();
    }
  else
    a2=0;
}

/*!
 * Second step of serialization process.
 * @param tinyInfo must be equal to the result given by getTinySerializationInformation method.
 */
void MEDCouplingPointSet::resizeForUnserialization(const std::vector<int>& tinyInfo, DataArrayInt *a1, DataArrayDouble *a2, std::vector<std::string>& littleStrings) const
{
  if(tinyInfo[2]>=0 && tinyInfo[1]>=1)
    {
      a2->alloc(tinyInfo[2],tinyInfo[1]);
      littleStrings.resize(tinyInfo[1]+4);
    }
  else
    {
      littleStrings.resize(3);
    }
}

/*!
 * Second and final unserialization process.
 * @param tinyInfo must be equal to the result given by getTinySerializationInformation method.
 */
void MEDCouplingPointSet::unserialization(const std::vector<double>& tinyInfoD, const std::vector<int>& tinyInfo, const DataArrayInt *a1, DataArrayDouble *a2, const std::vector<std::string>& littleStrings)
{
  if(tinyInfo[2]>=0 && tinyInfo[1]>=1)
    {
      setCoords(a2);
      setName(littleStrings[0]);
      setDescription(littleStrings[1]);
      a2->setName(littleStrings[2]);
      setTimeUnit(littleStrings[3]);
      for(int i=0;i<tinyInfo[1];i++)
        getCoords()->setInfoOnComponent(i,littleStrings[i+4]);
      setTime(tinyInfoD[0],tinyInfo[3],tinyInfo[4]);
    }
  else
    {
      setName(littleStrings[0]);
      setDescription(littleStrings[1]);
      setTimeUnit(littleStrings[2]);
      setTime(tinyInfoD[0],tinyInfo[3],tinyInfo[4]);
    }
}

void MEDCouplingPointSet::checkConsistencyLight() const
{
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::checkConsistencyLight : no coordinates set !");
}

/*!
 * Intersect Bounding Box given 2 Bounding Boxes.
 */
bool MEDCouplingPointSet::intersectsBoundingBox(const double* bb1, const double* bb2, int dim, double eps)
{
  double* bbtemp = new double[2*dim];
  double deltamax=0.0;

  for (int i=0; i< dim; i++)
    {
      double delta = bb1[2*i+1]-bb1[2*i];
      if ( delta > deltamax )
        {
          deltamax = delta ;
        }
    }
  for (int i=0; i<dim; i++)
    {
      bbtemp[i*2]=bb1[i*2]-deltamax*eps;
      bbtemp[i*2+1]=bb1[i*2+1]+deltamax*eps;
    }
  
  for (int idim=0; idim < dim; idim++)
    {
      bool intersects = (bbtemp[idim*2]<bb2[idim*2+1])
        && (bb2[idim*2]<bbtemp[idim*2+1]) ;
      if (!intersects)
        {
          delete [] bbtemp;
          return false; 
        }
    }
  delete [] bbtemp;
  return true;
}

/*!
 * Intersect 2 given Bounding Boxes.
 */
bool MEDCouplingPointSet::intersectsBoundingBox(const INTERP_KERNEL::DirectedBoundingBox& bb1, const double* bb2, int dim, double eps)
{
  double* bbtemp(new double[2*dim]);
  double deltamax(0.0);

  for (int i=0; i< dim; i++)
    {
      double delta = bb2[2*i+1]-bb2[2*i];
      if ( delta > deltamax )
        {
          deltamax = delta ;
        }
    }
  for (int i=0; i<dim; i++)
    {
      bbtemp[i*2]=bb2[i*2]-deltamax*eps;
      bbtemp[i*2+1]=bb2[i*2+1]+deltamax*eps;
    }
  
  bool intersects(!bb1.isDisjointWith(bbtemp));
  delete [] bbtemp;
  return intersects;
}

/*!
 * 'This' is expected to be of spaceDim==3. Idem for 'center' and 'vect'
 */
void MEDCouplingPointSet::rotate3D(const double *center, const double *vect, double angle)
{
  double *coords(_coords->getPointer());
  int nbNodes(getNumberOfNodes());
  DataArrayDouble::Rotate3DAlg(center,vect,angle,nbNodes,coords,coords);
}

/*!
 * This method allows to give for each cell in \a trgMesh, how much it interacts with cells of \a srcMesh.
 * The returned array can be seen as a weighted array on the target cells of \a trgMesh input parameter.
 *
 * \param [in] srcMesh - source mesh
 * \param [in] trgMesh - target mesh
 * \param [in] eps - precision of the detection
 * \return DataArrayInt * - An array that gives for each cell of \a trgMesh, how many cells in \a srcMesh (regarding the precision of detection \a eps) can interacts.
 * 
 * \throw If \a srcMesh and \a trgMesh have not the same space dimension.
 */
DataArrayInt *MEDCouplingPointSet::ComputeNbOfInteractionsWithSrcCells(const MEDCouplingPointSet *srcMesh, const MEDCouplingPointSet *trgMesh, double eps)
{
  if(!srcMesh || !trgMesh)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::ComputeNbOfInteractionsWithSrcCells : the input meshes must be not NULL !");
  MCAuto<DataArrayDouble> sbbox(srcMesh->getBoundingBoxForBBTree()),tbbox(trgMesh->getBoundingBoxForBBTree());
  return tbbox->computeNbOfInteractionsWith(sbbox,eps);
}

/*!
 * Creates a new MEDCouplingMesh containing a part of cells of \a this mesh. The new
 * mesh shares a coordinates array with \a this one. The cells to include to the
 * result mesh are specified by an array of cell ids.
 *  \param [in] start - an array of cell ids to include to the result mesh.
 *  \param [in] end - specifies the end of the array \a start, so that
 *              the last value of \a start is \a end[ -1 ].
 *  \return MEDCouplingMesh * - a new instance of MEDCouplingMesh. The caller is to
 *         delete this mesh using decrRef() as it is no more needed. 
 */
MEDCouplingMesh *MEDCouplingPointSet::buildPart(const int *start, const int *end) const
{
  return buildPartOfMySelf(start,end,true);
}

/*!
 * Creates a new MEDCouplingMesh containing a part of cells of \a this mesh. The
 * cells to include to the result mesh are specified by an array of cell ids. 
 * <br> This method additionally returns a renumbering map in "Old to New" mode
 * which allows the caller to know the mapping between nodes in \a this and the result mesh.
 *  \param [in] start - an array of cell ids to include to the result mesh.
 *  \param [in] end - specifies the end of the array \a start, so that
 *              the last value of \a start is \a end[ -1 ].
 *  \param [out] arr - a new DataArrayInt that is the "Old to New" renumbering
 *         map. The caller is to delete this array using decrRef() as it is no more needed.
 *  \return MEDCouplingMesh * - a new instance of MEDCouplingMesh. The caller is to
 *         delete this mesh using decrRef() as it is no more needed. 
 */
MEDCouplingMesh *MEDCouplingPointSet::buildPartAndReduceNodes(const int *start, const int *end, DataArrayInt*& arr) const
{
  MCAuto<MEDCouplingPointSet> ret=buildPartOfMySelf(start,end,true);
  arr=ret->zipCoordsTraducer();
  return ret.retn();
}

/*!
 * This method specialized the MEDCouplingMesh::buildPartRange.
 * This method is equivalent to MEDCouplingMesh::buildPart method except that here the cell ids are specified using slice
 * \a beginCellIds \a endCellIds and \a stepCellIds.
 * \b WARNING , there is a big difference compared to MEDCouplingMesh::buildPart method.
 * If the input range is equal all cells in \a this, \a this is returned !
 *
 * \return a new ref to be managed by the caller. Warning this ref can be equal to \a this if input slice is exactly equal to the whole cells in the same order.
 *
 * \sa MEDCouplingUMesh::buildPartOfMySelfSlice
 */
MEDCouplingMesh *MEDCouplingPointSet::buildPartRange(int beginCellIds, int endCellIds, int stepCellIds) const
{
  if(beginCellIds==0 && endCellIds==getNumberOfCells() && stepCellIds==1)
    {
      MEDCouplingMesh *ret(const_cast<MEDCouplingPointSet *>(this));
      ret->incrRef();
      return ret;
    }
  else
    {
      return buildPartOfMySelfSlice(beginCellIds,endCellIds,stepCellIds,true);
    }
}

/*!
 * This method specialized the MEDCouplingMesh::buildPartRangeAndReduceNodes
 *
 * \param [out] beginOut valid only if \a arr not NULL !
 * \param [out] endOut valid only if \a arr not NULL !
 * \param [out] stepOut valid only if \a arr not NULL !
 * \param [out] arr correspondance old to new in node ids.
 * 
 * \sa MEDCouplingUMesh::buildPartOfMySelfSlice
 */
MEDCouplingMesh *MEDCouplingPointSet::buildPartRangeAndReduceNodes(int beginCellIds, int endCellIds, int stepCellIds, int& beginOut, int& endOut, int& stepOut, DataArrayInt*& arr) const
{
  MCAuto<MEDCouplingPointSet> ret(buildPartOfMySelfSlice(beginCellIds,endCellIds,stepCellIds,true));
  arr=ret->zipCoordsTraducer();
  return ret.retn();
}

/*!
 * 'This' is expected to be of spaceDim==2. Idem for 'center' and 'vect'
 */
void MEDCouplingPointSet::rotate2D(const double *center, double angle)
{
  double *coords(_coords->getPointer());
  int nbNodes(getNumberOfNodes());
  DataArrayDouble::Rotate2DAlg(center,angle,nbNodes,coords,coords);
}

/// @cond INTERNAL

class DummyClsMCPS
{
public:
  static const int MY_SPACEDIM=3;
  static const int MY_MESHDIM=2;
  typedef int MyConnType;
  static const INTERP_KERNEL::NumberingPolicy My_numPol=INTERP_KERNEL::ALL_C_MODE;
};

/// @endcond

/*!
 * res should be an empty vector before calling this method.
 * This method returns all the node coordinates included in _coords which ids are in [startConn;endConn) and put it into 'res' vector.
 * If spaceDim==3 a projection will be done for each nodes on the middle plane containing these all nodes in [startConn;endConn).
 * And after each projected nodes are moved to Oxy plane in order to consider these nodes as 2D nodes.
 */
void MEDCouplingPointSet::project2DCellOnXY(const int *startConn, const int *endConn, std::vector<double>& res) const
{
  const double *coords(_coords->getConstPointer());
  int spaceDim(getSpaceDimension());
  for(const int *it=startConn;it!=endConn;it++)
    res.insert(res.end(),coords+spaceDim*(*it),coords+spaceDim*(*it+1));
  if(spaceDim==2)
    return ;
  if(spaceDim==3)
    {
      std::vector<double> cpy(res);
      int nbNodes=(int)std::distance(startConn,endConn);
      INTERP_KERNEL::PlanarIntersector<DummyClsMCPS,int>::Projection(&res[0],&cpy[0],nbNodes,nbNodes,1.e-12,0./*max distance*/,-1./*min dot*/,0.,true);
      res.resize(2*nbNodes);
      for(int i=0;i<nbNodes;i++)
        {
          res[2*i]=cpy[3*i];
          res[2*i+1]=cpy[3*i+1];
        }
      return ;
    }
  throw INTERP_KERNEL::Exception("Invalid spacedim for project2DCellOnXY !");
}

/*!
 * low level method that checks that the 2D cell is not a butterfly cell.
 */
bool MEDCouplingPointSet::isButterfly2DCell(const std::vector<double>& res, bool isQuad, double eps)
{
  INTERP_KERNEL::QuadraticPlanarPrecision prec(eps);
  INTERP_KERNEL::QuadraticPlanarArcDetectionPrecision arcPrec(eps);

  std::size_t nbOfNodes(res.size()/2);
  std::vector<INTERP_KERNEL::Node *> nodes(nbOfNodes);
  for(std::size_t i=0;i<nbOfNodes;i++)
    {
      INTERP_KERNEL::Node *tmp=new INTERP_KERNEL::Node(res[2*i],res[2*i+1]);
      nodes[i]=tmp;
    }
  INTERP_KERNEL::QuadraticPolygon *pol=0;
  if(isQuad)
    pol=INTERP_KERNEL::QuadraticPolygon::BuildArcCirclePolygon(nodes);
  else
    pol=INTERP_KERNEL::QuadraticPolygon::BuildLinearPolygon(nodes);
  bool ret(pol->isButterflyAbs());
  delete pol;
  return ret;
}

/*!
 * This method compares 2 cells coming from two unstructured meshes : \a this and \a other.
 * This method compares 2 cells having the same id 'cellId' in \a this and \a other.
 */
bool MEDCouplingPointSet::areCellsFrom2MeshEqual(const MEDCouplingPointSet *other, int cellId, double prec) const
{
  if(getTypeOfCell(cellId)!=other->getTypeOfCell(cellId))
    return false;
  std::vector<int> c1,c2;
  getNodeIdsOfCell(cellId,c1);
  other->getNodeIdsOfCell(cellId,c2);
  std::size_t sz(c1.size());
  if(sz!=c2.size())
    return false;
  for(std::size_t i=0;i<sz;i++)
    {
      std::vector<double> n1,n2;
      getCoordinatesOfNode(c1[0],n1);
      other->getCoordinatesOfNode(c2[0],n2);
      std::transform(n1.begin(),n1.end(),n2.begin(),n1.begin(),std::minus<double>());
      std::transform(n1.begin(),n1.end(),n1.begin(),std::ptr_fun<double,double>(fabs));
      if(*std::max_element(n1.begin(),n1.end())>prec)
        return false;
    }
  return true;
}

/*!
 * Substitutes node coordinates array of \a this mesh with that of \a other mesh
 * (i.e. \a this->_coords with \a other._coords) provided that coordinates of the two
 * meshes match with a specified precision, else an exception is thrown and \a this
 * remains unchanged. In case of success the nodal connectivity of \a this mesh
 * is permuted according to new order of nodes.
 * Contrary to tryToShareSameCoords() this method makes a deeper analysis of
 * coordinates (and so more expensive) than simple equality.
 *  \param [in] other - the other mesh whose node coordinates array will be used by
 *         \a this mesh in case of their equality.
 *  \param [in] epsilon - the precision used to compare coordinates (using infinite norm).
 *  \throw If the coordinates array of \a this is not set.
 *  \throw If the coordinates array of \a other is not set.
 *  \throw If the coordinates of \a this and \a other do not match.
 */
void MEDCouplingPointSet::tryToShareSameCoordsPermute(const MEDCouplingPointSet& other, double epsilon)
{
  const DataArrayDouble *coords=other.getCoords();
  if(!coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::tryToShareSameCoordsPermute : No coords specified in other !");
  if(!_coords)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::tryToShareSameCoordsPermute : No coords specified in this whereas there is any in other !");
  int otherNbOfNodes=other.getNumberOfNodes();
  MCAuto<DataArrayDouble> newCoords=MergeNodesArray(&other,this);
  _coords->incrRef();
  MCAuto<DataArrayDouble> oldCoords=_coords;
  setCoords(newCoords);
  bool areNodesMerged;
  int newNbOfNodes;
  MCAuto<DataArrayInt> da=buildPermArrayForMergeNode(epsilon,otherNbOfNodes,areNodesMerged,newNbOfNodes);
  if(!areNodesMerged)
    {
      setCoords(oldCoords);
      throw INTERP_KERNEL::Exception("MEDCouplingPointSet::tryToShareSameCoordsPermute fails : no nodes are mergeable with specified given epsilon !");
    }
  int maxId=*std::max_element(da->getConstPointer(),da->getConstPointer()+otherNbOfNodes);
  const int *pt=std::find_if(da->getConstPointer()+otherNbOfNodes,da->getConstPointer()+da->getNbOfElems(),std::bind2nd(std::greater<int>(),maxId));
  if(pt!=da->getConstPointer()+da->getNbOfElems())
    {
      setCoords(oldCoords);
      throw INTERP_KERNEL::Exception("MEDCouplingPointSet::tryToShareSameCoordsPermute fails : some nodes in this are not in other !");
    }
  setCoords(oldCoords);
  renumberNodesInConn(da->getConstPointer()+otherNbOfNodes);
  setCoords(coords);
}

MEDCouplingPointSet *MEDCouplingPointSet::buildPartOfMySelf(const int *begin, const int *end, bool keepCoords) const
{
  MCAuto<MEDCouplingPointSet> ret=buildPartOfMySelfKeepCoords(begin,end);
  if(!keepCoords)
    ret->zipCoords();
  return ret.retn();
}

MEDCouplingPointSet *MEDCouplingPointSet::buildPartOfMySelfSlice(int start, int end, int step, bool keepCoords) const
{
  MCAuto<MEDCouplingPointSet> ret=buildPartOfMySelfKeepCoordsSlice(start,end,step);
  if(!keepCoords)
    ret->zipCoords();
  return ret.retn();
}

/*!
 Creates a new MEDCouplingUMesh containing some cells of \a this mesh. The cells to
 copy are selected basing on specified node ids and the value of \a fullyIn
 parameter. If \a fullyIn ==\c true, a cell is copied if its all nodes are in the 
 array \a begin of node ids. If \a fullyIn ==\c false, a cell is copied if any its
 node is in the array of node ids. The created mesh shares the node coordinates array
 with \a this mesh.
 *  \param [in] begin - the array of node ids.
 *  \param [in] end - a pointer to the (last+1)-th element of \a begin.
 *  \param [in] fullyIn - if \c true, then cells whose all nodes are in the
 *         array \a begin are copied, else cells whose any node is in the
 *         array \a begin are copied.
 *  \return MEDCouplingPointSet * - new instance of MEDCouplingUMesh. The caller is
 *         to delete this mesh using decrRef() as it is no more needed. 
 *  \throw If the coordinates array is not set.
 *  \throw If the nodal connectivity of cells is not defined.
 *  \throw If any node id in \a begin is not valid.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcumesh_buildPartOfMySelfNode "Here is a C++ example".<br>
 *  \ref  py_mcumesh_buildPartOfMySelfNode "Here is a Python example".
 *  \endif
 */
MEDCouplingPointSet *MEDCouplingPointSet::buildPartOfMySelfNode(const int *begin, const int *end, bool fullyIn) const
{
  DataArrayInt *cellIdsKept=0;
  fillCellIdsToKeepFromNodeIds(begin,end,fullyIn,cellIdsKept);
  MCAuto<DataArrayInt> cellIdsKept2(cellIdsKept);
  return buildPartOfMySelf(cellIdsKept->begin(),cellIdsKept->end(),true);
}

/*!
 * Removes duplicates of cells from \a this mesh and returns an array mapping between
 * new and old cell ids in "Old to New" mode. Nothing is changed in \a this mesh if no
 * equal cells found.
 *  \warning Cells of the result mesh are \b not sorted by geometric type, hence,
 *           to write this mesh to the MED file, its cells must be sorted using
 *           sortCellsInMEDFileFrmt().
 *  \param [in] compType - specifies a cell comparison technique. Meaning of its
 *          valid values [0,1,2] is as follows.
 *   - 0 : "exact". Two cells are considered equal \c iff they have exactly same nodal
 *         connectivity and type. This is the strongest policy.
 *   - 1 : "permuted same orientation". Two cells are considered equal \c iff they
 *         are based on same nodes and have the same type and orientation.
 *   - 2 : "nodal". Two cells are considered equal \c iff they
 *         are based on same nodes and have the same type. This is the weakest
 *         policy, it can be used by users not sensitive to cell orientation.
 *  \param [in] startCellId - specifies the cell id at which search for equal cells
 *         starts. By default it is 0, which means that all cells in \a this will be
 *         scanned. 
 *  \return DataArrayInt - a new instance of DataArrayInt, of length \a
 *           this->getNumberOfCells() before call of this method. The caller is to
 *           delete this array using decrRef() as it is no more needed. 
 *  \throw If the coordinates array is not set.
 *  \throw If the nodal connectivity of cells is not defined.
 *  \throw If the nodal connectivity includes an invalid id.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcumesh_zipConnectivityTraducer "Here is a C++ example".<br>
 *  \ref  py_mcumesh_zipConnectivityTraducer "Here is a Python example".
 *  \endif
 */
DataArrayInt *MEDCouplingPointSet::zipConnectivityTraducer(int compType, int startCellId)
{
  DataArrayInt *commonCells=0,*commonCellsI=0;
  findCommonCells(compType,startCellId,commonCells,commonCellsI);
  MCAuto<DataArrayInt> commonCellsTmp(commonCells),commonCellsITmp(commonCellsI);
  int newNbOfCells=-1;
  MCAuto<DataArrayInt> ret=DataArrayInt::ConvertIndexArrayToO2N(getNumberOfCells(),commonCells->begin(),commonCellsI->begin(),
                                                                                                          commonCellsI->end(),newNbOfCells);
  MCAuto<DataArrayInt> ret2=ret->invertArrayO2N2N2O(newNbOfCells);
  MCAuto<MEDCouplingPointSet> self=buildPartOfMySelf(ret2->begin(),ret2->end(),true);
  shallowCopyConnectivityFrom(self);
  return ret.retn();
}

/*!
 * This const method states if the nodal connectivity of this fetches all nodes in \a this.
 * In other words, this method looks is there are no orphan nodes in \a this.
 * \sa zipCoordsTraducer, getNodeIdsInUse, computeFetchedNodeIds.
 */
bool MEDCouplingPointSet::areAllNodesFetched() const
{
  checkFullyDefined();
  int nbNodes(getNumberOfNodes());
  std::vector<bool> fetchedNodes(nbNodes,false);
  computeNodeIdsAlg(fetchedNodes);
  return std::find(fetchedNodes.begin(),fetchedNodes.end(),false)==fetchedNodes.end();
}

/*!
 * Checks if \a this and \a other meshes are geometrically equivalent, else an
 * exception is thrown. The meshes are
 * considered equivalent if (1) \a this mesh contains the same nodes as the \a other
 * mesh (with a specified precision) and (2) \a this mesh contains the same cells as
 * the \a other mesh (with use of a specified cell comparison technique). The mapping 
 * from \a other to \a this for nodes and cells is returned via out parameters.
 *
 * If \a cellCor is null (or Py_None) it means that for all #i cell in \a other is equal to cell # i in \a this.
 *
 * If \a nodeCor is null (or Py_None) it means that for all #i node in \a other is equal to node # i in \a this.
 *
 * So null (or Py_None) returned in \a cellCor and/or \a nodeCor means identity array. This is for optimization reason to avoid building
 * useless arrays for some \a levOfCheck (for example 0).
 *
 *  \param [in] other - the mesh to compare with.
 *  \param [in] cellCompPol - id [0-2] of cell comparison method. See meaning of
 *         each method in description of MEDCouplingPointSet::zipConnectivityTraducer().
 *  \param [in] prec - the precision used to compare nodes of the two meshes.
 *  \param [out] cellCor - a cell permutation array in "Old to New" mode. The caller is
 *         to delete this array using decrRef() as it is no more needed.
 *  \param [out] nodeCor - a node permutation array in "Old to New" mode. The caller is
 *         to delete this array using decrRef() as it is no more needed.
 *  \throw If the two meshes do not match.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcumesh_checkDeepEquivalWith "Here is a C++ example".<br>
 *  \ref  py_mcumesh_checkDeepEquivalWith "Here is a Python example".
 *  \endif
 */
void MEDCouplingPointSet::checkDeepEquivalWith(const MEDCouplingMesh *other, int cellCompPol, double prec,
                                               DataArrayInt *&cellCor, DataArrayInt *&nodeCor) const
{
  if(!other)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::checkDeepEquivalWith : input is null !");
  const MEDCouplingPointSet *otherC=dynamic_cast<const MEDCouplingPointSet *>(other);
  if(!otherC)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::checkDeepEquivalWith : other is not a PointSet mesh !");
  MCAuto<MEDCouplingPointSet> m=dynamic_cast<MEDCouplingPointSet *>(mergeMyselfWith(otherC));
  bool areNodesMerged;
  int newNbOfNodes;
  int oldNbOfNodes=getNumberOfNodes();
  MCAuto<DataArrayInt> da=m->buildPermArrayForMergeNode(prec,oldNbOfNodes,areNodesMerged,newNbOfNodes);
  //mergeNodes
  if(!areNodesMerged && oldNbOfNodes != 0)
    throw INTERP_KERNEL::Exception("checkDeepEquivalWith : Nodes are incompatible ! ");
  const int *pt=std::find_if(da->getConstPointer()+oldNbOfNodes,da->getConstPointer()+da->getNbOfElems(),std::bind2nd(std::greater<int>(),oldNbOfNodes-1));
  if(pt!=da->getConstPointer()+da->getNbOfElems())
    throw INTERP_KERNEL::Exception("checkDeepEquivalWith : some nodes in other are not in this !");
  m->renumberNodes(da->getConstPointer(),newNbOfNodes);
  //
  MCAuto<DataArrayInt> nodeCor2=da->subArray(oldNbOfNodes);
  da=m->mergeNodes(prec,areNodesMerged,newNbOfNodes);
  //
  da=m->zipConnectivityTraducer(cellCompPol);
  int nbCells=getNumberOfCells();
  if (nbCells != other->getNumberOfCells())
    throw INTERP_KERNEL::Exception("checkDeepEquivalWith : some cells in other are not in this !");
  int dan(da->getNumberOfTuples());
  if (dan)
    {
      MCAuto<DataArrayInt> da1(DataArrayInt::New()),da2(DataArrayInt::New());
      da1->alloc(dan/2,1); da2->alloc(dan/2,1);
      std::copy(da->getConstPointer(), da->getConstPointer()+dan/2, da1->getPointer());
      std::copy(da->getConstPointer()+dan/2, da->getConstPointer()+dan, da2->getPointer());
      da1->sort(); da2->sort();
      if (!da1->isEqualWithoutConsideringStr(*da2))
        throw INTERP_KERNEL::Exception("checkDeepEquivalWith : some cells in other are not in this !");
    }
  MCAuto<DataArrayInt> cellCor2=da->selectByTupleIdSafeSlice(nbCells,da->getNbOfElems(),1);
  nodeCor=nodeCor2->isIota(nodeCor2->getNumberOfTuples())?0:nodeCor2.retn();
  cellCor=cellCor2->isIota(cellCor2->getNumberOfTuples())?0:cellCor2.retn();
}

/*!
 * Checks if \a this and \a other meshes are geometrically equivalent, else an
 * exception is thrown. The meshes are considered equivalent if (1) they share one
 * node coordinates array and (2) they contain the same cells (with use of a specified
 * cell comparison technique). The mapping from cells of the \a other to ones of \a this 
 * is returned via an out parameter.
 *
 * If \a cellCor is null (or Py_None) it means that for all #i cell in \a other is equal to cell # i in \a this.
 *
 *  \param [in] other - the mesh to compare with.
 *  \param [in] cellCompPol - id [0-2] of cell comparison method. See the meaning of
 *         each method in description of MEDCouplingPointSet::zipConnectivityTraducer().
 *  \param [in] prec - a not used parameter.
 *  \param [out] cellCor - the permutation array in "Old to New" mode. The caller is
 *         to delete this array using decrRef() as it is no more needed.
 *  \throw If the two meshes do not match.
 *
 * \if ENABLE_EXAMPLES
 * \ref cpp_mcumesh_checkDeepEquivalWith "Here is a C++ example".<br>
 * \ref  py_mcumesh_checkDeepEquivalWith "Here is a Python example".
 * \endif
 */
void MEDCouplingPointSet::checkDeepEquivalOnSameNodesWith(const MEDCouplingMesh *other, int cellCompPol, double prec,
                                                       DataArrayInt *&cellCor) const
{
  if(!other)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::checkDeepEquivalOnSameNodesWith : input is null !");
  const MEDCouplingPointSet *otherC=dynamic_cast<const MEDCouplingPointSet *>(other);
  if(!otherC)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::checkDeepEquivalOnSameNodesWith : other is not a PointSet mesh !");
  if(_coords!=otherC->_coords)
    throw INTERP_KERNEL::Exception("checkDeepEquivalOnSameNodesWith : meshes do not share the same coordinates ! Use tryToShareSameCoordinates or call checkDeepEquivalWith !");
  MCAuto<MEDCouplingPointSet> m=mergeMyselfWithOnSameCoords(otherC);
  MCAuto<DataArrayInt> da=m->zipConnectivityTraducer(cellCompPol);
  int maxId=*std::max_element(da->getConstPointer(),da->getConstPointer()+getNumberOfCells());
  const int *pt=std::find_if(da->getConstPointer()+getNumberOfCells(),da->getConstPointer()+da->getNbOfElems(),std::bind2nd(std::greater<int>(),maxId));
  if(pt!=da->getConstPointer()+da->getNbOfElems())
    {
      throw INTERP_KERNEL::Exception("checkDeepEquivalOnSameNodesWith : some cells in other are not in this !");
    }
  MCAuto<DataArrayInt> cellCor2=da->selectByTupleIdSafeSlice(getNumberOfCells(),da->getNbOfElems(),1);
  cellCor=cellCor2->isIota(cellCor2->getNumberOfTuples())?0:cellCor2.retn();
}

void MEDCouplingPointSet::checkFastEquivalWith(const MEDCouplingMesh *other, double prec) const
{
  MEDCouplingMesh::checkFastEquivalWith(other,prec);
  //other not null checked by the line before
  const MEDCouplingPointSet *otherC=dynamic_cast<const MEDCouplingPointSet *>(other);
  if(!otherC)
    throw INTERP_KERNEL::Exception("MEDCouplingPointSet::checkFastEquivalWith : fails because other is not a pointset mesh !");
  int nbOfCells=getNumberOfCells();
  if(nbOfCells<1)
    return ;
  bool status=true;
  status&=areCellsFrom2MeshEqual(otherC,0,prec);
  status&=areCellsFrom2MeshEqual(otherC,nbOfCells/2,prec);
  status&=areCellsFrom2MeshEqual(otherC,nbOfCells-1,prec);
  if(!status)
    throw INTERP_KERNEL::Exception("checkFastEquivalWith : Two meshes are not equal because on 3 test cells some difference have been detected !");
}

/*!
 * Finds cells whose all or some nodes are in a given array of node ids.
 *  \param [in] begin - the array of node ids.
 *  \param [in] end - a pointer to the (last+1)-th element of \a begin.
 *  \param [in] fullyIn - if \c true, then cells whose all nodes are in the
 *         array \a begin are returned only, else cells whose any node is in the
 *         array \a begin are returned.
 *  \return DataArrayInt * - a new instance of DataArrayInt holding ids of found
 *         cells. The caller is to delete this array using decrRef() as it is no more
 *         needed. 
 *  \throw If the coordinates array is not set.
 *  \throw If the nodal connectivity of cells is not defined.
 *  \throw If any cell id in \a begin is not valid.
 *
 * \sa MEDCouplingPointSet::getCellIdsFullyIncludedInNodeIds
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcumesh_getCellIdsLyingOnNodes "Here is a C++ example".<br>
 *  \ref  py_mcumesh_getCellIdsLyingOnNodes "Here is a Python example".
 *  \endif
 */
DataArrayInt *MEDCouplingPointSet::getCellIdsLyingOnNodes(const int *begin, const int *end, bool fullyIn) const
{
  DataArrayInt *cellIdsKept=0;
  fillCellIdsToKeepFromNodeIds(begin,end,fullyIn,cellIdsKept);
  cellIdsKept->setName(getName());
  return cellIdsKept;
}

/*!
 * Finds cells whose all nodes are in a given array of node ids.
 * This method is a specialization of MEDCouplingPointSet::getCellIdsLyingOnNodes (true
 * as last input argument).
 *  \param [in] partBg - the array of node ids.
 *  \param [in] partEnd - a pointer to a (last+1)-th element of \a partBg.
 *  \return DataArrayInt * - a new instance of DataArrayInt holding ids of found
 *          cells. The caller is to delete this array using decrRef() as it is no
 *          more needed.
 *  \throw If the coordinates array is not set.
 *  \throw If the nodal connectivity of cells is not defined.
 *  \throw If any cell id in \a partBg is not valid.
 * 
 * \sa MEDCouplingPointSet::getCellIdsLyingOnNodes
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcumesh_getCellIdsFullyIncludedInNodeIds "Here is a C++ example".<br>
 *  \ref  py_mcumesh_getCellIdsFullyIncludedInNodeIds "Here is a Python example".
 *  \endif
 */
DataArrayInt *MEDCouplingPointSet::getCellIdsFullyIncludedInNodeIds(const int *partBg, const int *partEnd) const
{
  return getCellIdsLyingOnNodes(partBg,partEnd,true);
}

/*!
 * Removes unused nodes (the node coordinates array is shorten) and returns an array
 * mapping between new and old node ids in "Old to New" mode. -1 values in the returned
 * array mean that the corresponding old node is no more used. 
 *  \return DataArrayInt * - a new instance of DataArrayInt of length \a
 *           this->getNumberOfNodes() before call of this method. The caller is to
 *           delete this array using decrRef() as it is no more needed. 
 *  \throw If the coordinates array is not set.
 *  \throw If the nodal connectivity of cells is not defined.
 *  \throw If the nodal connectivity includes an invalid id.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcumesh_zipCoordsTraducer "Here is a C++ example".<br>
 *  \ref  py_mcumesh_zipCoordsTraducer "Here is a Python example".
 *  \endif
 */
DataArrayInt *MEDCouplingPointSet::zipCoordsTraducer()
{
  int newNbOfNodes=-1;
  MCAuto<DataArrayInt> traducer=getNodeIdsInUse(newNbOfNodes);
  renumberNodes(traducer->getConstPointer(),newNbOfNodes);
  return traducer.retn();
}

/*!
 * Merges nodes equal within \a precision and returns an array describing the 
 * permutation used to remove duplicate nodes.
 *  \param [in] precision - minimal absolute distance between two nodes at which they are
 *              considered not coincident.
 *  \param [out] areNodesMerged - is set to \c true if any coincident nodes removed.
 *  \param [out] newNbOfNodes - number of nodes remaining after the removal.
 *  \return DataArrayInt * - the permutation array in "Old to New" mode. For more 
 *          info on "Old to New" mode see \ref numbering. The caller
 *          is to delete this array using decrRef() as it is no more needed.
 *  \throw If the coordinates array is not set.
 *  \throw If the nodal connectivity of cells is not defined.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcumesh_mergeNodes "Here is a C++ example".<br>
 *  \ref  py_mcumesh_mergeNodes "Here is a Python example".
 *  \endif
 */
DataArrayInt *MEDCouplingPointSet::mergeNodes(double precision, bool& areNodesMerged, int& newNbOfNodes)
{
  MCAuto<DataArrayInt> ret=buildPermArrayForMergeNode(precision,-1,areNodesMerged,newNbOfNodes);
  if(areNodesMerged)
    renumberNodes(ret->begin(),newNbOfNodes);
  return ret.retn();
}

/*!
 * Merges nodes equal within \a precision and returns an array describing the 
 * permutation used to remove duplicate nodes. In contrast to mergeNodes(), location
 *  of merged nodes is changed to be at their barycenter.
 *  \param [in] precision - minimal absolute distance between two nodes at which they are
 *              considered not coincident.
 *  \param [out] areNodesMerged - is set to \c true if any coincident nodes removed.
 *  \param [out] newNbOfNodes - number of nodes remaining after the removal.
 *  \return DataArrayInt * - the permutation array in "Old to New" mode. For more 
 *          info on "Old to New" mode see \ref numbering. The caller
 *          is to delete this array using decrRef() as it is no more needed.
 *  \throw If the coordinates array is not set.
 *  \throw If the nodal connectivity of cells is not defined.
 *
 *  \if ENABLE_EXAMPLES
 *  \ref cpp_mcumesh_mergeNodes "Here is a C++ example".<br>
 *  \ref  py_mcumesh_mergeNodes "Here is a Python example".
 *  \endif
 */
DataArrayInt *MEDCouplingPointSet::mergeNodesCenter(double precision, bool& areNodesMerged, int& newNbOfNodes)
{
  DataArrayInt *ret=buildPermArrayForMergeNode(precision,-1,areNodesMerged,newNbOfNodes);
  if(areNodesMerged)
    renumberNodesCenter(ret->getConstPointer(),newNbOfNodes);
  return ret;
}