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// This file is part of ff3d - http://www.freefem.org/ff3d
// Copyright (C) 2001, 2002, 2003 Stphane Del Pino
// This program 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 2, or (at your option)
// any later version.
// This program 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 this program; if not, write to the Free Software Foundation,
// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
// $Id: MeshExtractor.hpp,v 1.12 2007/02/07 23:54:57 delpinux Exp $
#ifndef MESH_EXTRACTOR_HPP
#define MESH_EXTRACTOR_HPP
#include <ReferenceCounting.hpp>
#include <CellDuplicator.hpp>
#include <ErrorHandler.hpp>
#include <sstream>
#include <set>
/**
* @file MeshExtractor.hpp
* @author Stephane Del Pino
* @date Sat Sep 13 16:55:56 2003
*
* @brief Extracts sub-meshes from a given one using elements
* reference
*
*/
template <typename MeshType>
struct CopyBackgroundMesh
{
static void copy(const MeshType& originalMesh,
MeshType* m)
{
;
}
};
template <>
struct CopyBackgroundMesh<SurfaceMeshOfTriangles>
{
static void copy(const SurfaceMeshOfTriangles& originalMesh,
SurfaceMeshOfTriangles* m)
{
m->setBackgroundMesh(originalMesh.backgroundMesh());
}
};
template <>
struct CopyBackgroundMesh<SurfaceMeshOfQuadrangles>
{
static void copy(const SurfaceMeshOfQuadrangles& originalMesh,
SurfaceMeshOfQuadrangles* m)
{
m->setBackgroundMesh(originalMesh.backgroundMesh());
}
};
template <typename MeshType>
class MeshExtractor
{
private:
ConstReferenceCounting<MeshType> __originalMesh; /**< The original mesh */
public:
/**
* Returns a sub-mesh composed of given references
*
* @param referencesSet the set of references of elements to extract
*
* @return the sub-mesh
*/
MeshType*
operator()(const std::set<size_t>& referencesSet) const
{
typedef typename MeshType::CellType CellType;
std::set<size_t> keptCells;
for (typename MeshType::const_iterator icell(*__originalMesh);
not(icell.end()); ++icell) {
const CellType& cell = *icell;
if (referencesSet.find(cell.reference()) != referencesSet.end()) {
keptCells.insert(__originalMesh->cellNumber(cell));
}
}
if (keptCells.size() == 0) {
std::stringstream errorMsg;
errorMsg << "no cell has reference that matches (";
for (std::set<size_t>::const_iterator i = referencesSet.begin();
i != referencesSet.end(); ++i) {
errorMsg << *i << ',';
}
errorMsg << "\b)!" << std::ends;
throw ErrorHandler(__FILE__,__LINE__,
errorMsg.str(),
ErrorHandler::normal);
}
ReferenceCounting<Vector<CellType> > pCellList
= new Vector<CellType>(keptCells.size());
Vector<CellType>& cellList = *pCellList;
size_t n=0;
for (std::set<size_t>::const_iterator i = keptCells.begin();
i != keptCells.end(); ++i, ++n) {
const CellType& cell = __originalMesh->cell(*i);
cellList[n] = cell;
}
MeshType* m = new MeshType(__originalMesh->__verticesSet,
__originalMesh->__verticesCorrespondance,
pCellList);
CopyBackgroundMesh<MeshType>::copy(*__originalMesh, m);
return m;
}
/**
* Creates a MeshExtrator using a given \a m mesh
*
* @param m the given mesh
*/
MeshExtractor(ConstReferenceCounting<MeshType> m)
: __originalMesh(m)
{
;
}
/**
* Copy constructor
*
* @param m a given MeshExtractor
*/
MeshExtractor(const MeshExtractor& m)
: __originalMesh(m.__originalMesh)
{
;
}
/**
* Destructor
*
*/
~MeshExtractor()
{
;
}
};
#endif // MESH_EXTRACTOR_HPP
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