grid/dgfparser.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_MMESH_GRID_DGFPARSER_HH
#define DUNE_MMESH_GRID_DGFPARSER_HH
 
// System includes
#include <memory>
#include <utility>
#include <vector>
 
// Dune includes
#include <dune/grid/common/intersection.hh>
#include <dune/grid/io/file/dgfparser/blocks/projection.hh>
#include <dune/grid/io/file/dgfparser/dgfparser.hh>
#include <dune/grid/io/file/dgfparser/parser.hh>
 
// MMesh includes
#include <dune/mmesh/grid/explicitgridfactory.hh>
 
namespace Dune {
 
// External Forward Declarations
// -----------------------------
template <class GridImp, class IntersectionImp>
class Intersection;
 
// DGFGridFactory for MMesh
// ------------------------
template <class HostGrid, int dim>
struct DGFGridFactory<MMesh<HostGrid, dim> > {
  typedef MMesh<HostGrid, dim> Grid;
  const static int dimension = Grid::dimension;
  typedef MPIHelper::MPICommunicator MPICommunicatorType;
  typedef typename Grid::template Codim<0>::Entity Element;
  typedef typename Grid::template Codim<dimension>::Entity Vertex;
  typedef Dune::MMeshExplicitGridFactory<Grid> GridFactory;
 
  explicit DGFGridFactory(
      std::istream &input,
      MPICommunicatorType comm = MPIHelper::getCommunicator());
  explicit DGFGridFactory(
      const std::string &filename,
      MPICommunicatorType comm = MPIHelper::getCommunicator());
 
  Grid *grid() const { return grid_; }
 
  template <class Intersection>
  bool wasInserted(const Intersection &intersection) const {
    return factory_.wasInserted(intersection);
  }
 
  template <class Intersection>
  int boundaryId(const Intersection &intersection) const {
    return intersection.impl().boundaryId();
  }
 
  std::vector<double> &parameter(const Element &element) {
    if (numParameters<0>() <= 0) {
      DUNE_THROW(InvalidStateException,
                 "Calling DGFGridFactory::parameter is only allowed if there "
                 "are parameters.");
    }
    return dgf_.elParams[factory_.insertionIndex(element)];
  }
 
  std::vector<double> &parameter(const Vertex &vertex) {
    if (numParameters<dimension>() <= 0) {
      DUNE_THROW(InvalidStateException,
                 "Calling DGFGridFactory::parameter is only allowed if there "
                 "are parameters.");
    }
    return dgf_.vtxParams[factory_.insertionIndex(vertex)];
  }
 
  bool haveBoundaryParameters() const { return dgf_.haveBndParameters; }
 
  template <class GG, class II>
  const DGFBoundaryParameter::type boundaryParameter(
      const Intersection<GG, II> &intersection) const {
    return DGFBoundaryParameter::type();
  }
 
  template <int codim>
  int numParameters() const {
    return 0;
  }
 
 private:
  bool generate(std::istream &input) {
    dgf_.element = DuneGridFormatParser::Simplex;
    dgf_.dimgrid = dimension;
    dgf_.dimw = dimension;
 
    if (!dgf_.readDuneGrid(input, dimension, dimension)) return false;
 
    // Insert vertices
    for (int n = 0; n < dgf_.nofvtx; ++n) {
      typename GridFactory::WorldVector coord;
      for (std::size_t i = 0; i < dimension; ++i) coord[i] = dgf_.vtx[n][i];
      factory_.insertVertex(coord);
    }
 
    // Insert elements
    for (int n = 0; n < dgf_.nofelements; ++n)
      factory_.insertElement(GeometryTypes::simplex(dimension),
                             dgf_.elements[n]);
 
    // Insert boundary segments and ids
    for (const auto &face : dgf_.facemap) {
      const auto &entityKey = face.first;
      const std::size_t boundaryId = face.second.first;
 
      std::vector<unsigned int> vertices;
      for (int i = 0; i < entityKey.size(); ++i)
        vertices.push_back(entityKey[i]);
 
      std::sort(vertices.begin(), vertices.end());
 
      // insert boundary segment
      factory_.insertBoundarySegment(vertices);
 
      // insert boundary id
      std::size_t index = factory_.boundarySegments().size() - 1;
      factory_.addBoundaryId(index, boundaryId);
    }
 
    grid_ = factory_.createGrid().release();
    return true;
  }
 
  Grid *grid_;
  GridFactory factory_;
  DuneGridFormatParser dgf_;
};
 
// DGFGridInfo for MMesh
// ---------------------
 
template <class HostGrid, int dim>
struct DGFGridInfo<MMesh<HostGrid, dim> > {
  static int refineStepsForHalf() { return 2; }
 
  static double refineWeight() { return -1; }
};
 
// Implementation of DGFGridFactory for MMesh
// ------------------------------------------
 
template <class HostGrid, int dim>
inline DGFGridFactory<MMesh<HostGrid, dim> >::DGFGridFactory(
    std::istream &input, MPICommunicatorType comm)
    : dgf_(0, 1) {
  input.clear();
  input.seekg(0);
  if (!input) DUNE_THROW(DGFException, "Error resetting input stream.");
  generate(input);
}
 
template <class HostGrid, int dim>
inline DGFGridFactory<MMesh<HostGrid, dim> >::DGFGridFactory(
    const std::string &filename, MPICommunicatorType comm)
    : dgf_(0, 1) {
  std::ifstream input(filename.c_str());
  if (!input)
    DUNE_THROW(DGFException, "Macrofile " << filename << " not found.");
  if (!generate(input))
    DUNE_THROW(DGFException,
               "Could not generate MMesh from macrofile " << filename);
  input.close();
}
 
}  // namespace Dune
 
#endif