Orienter_Simplexes.cpp

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#include <Orienter_Simplexes.h>
#include <Scatter.h>
#include <Domaine.h>
#include <Motcle.h>
 
Implemente_instanciable(Orienter_Simplexes,"Orienter_Simplexes_old",Interprete_geometrique_base) ;
 
Sortie& Orienter_Simplexes::printOn(Sortie& os) const
{
  Interprete_geometrique_base::printOn(os);
  return os;
}
 
Entree& Orienter_Simplexes::readOn(Entree& is)
{
  Interprete_geometrique_base::readOn(is);
  return is;
}
 
static void choose_internal_diagonal_for_triangle(Domaine& domain)
{
  // nothing to do
}
 
static void choose_internal_diagonal_for_tetrahedron(Domaine& domain)
{
  const DoubleTab& nodes = domain.les_sommets();
  IntTab&           cells = domain.les_elems();
 
  ArrOfDouble lengths(3);
 
  const int nb_cells = cells.dimension(0);
  for (int cell=0; cell<nb_cells; ++cell)
    {
      const int s0 = cells(cell,0);
      const int s1 = cells(cell,1);
      const int s2 = cells(cell,2);
      const int s3 = cells(cell,3);
 
      const double x0 = nodes(s0,0);
      const double x1 = nodes(s1,0);
      const double x2 = nodes(s2,0);
      const double x3 = nodes(s3,0);
 
      const double y0 = nodes(s0,1);
      const double y1 = nodes(s1,1);
      const double y2 = nodes(s2,1);
      const double y3 = nodes(s3,1);
 
      const double z0 = nodes(s0,2);
      const double z1 = nodes(s1,2);
      const double z2 = nodes(s2,2);
      const double z3 = nodes(s3,2);
 
      const double x01 = 0.5 * (x0+x1);
      const double x02 = 0.5 * (x0+x2);
      const double x03 = 0.5 * (x0+x3);
      const double x12 = 0.5 * (x1+x2);
      const double x13 = 0.5 * (x1+x3);
      const double x23 = 0.5 * (x2+x3);
 
      const double y01 = 0.5 * (y0+y1);
      const double y02 = 0.5 * (y0+y2);
      const double y03 = 0.5 * (y0+y3);
      const double y12 = 0.5 * (y1+y2);
      const double y13 = 0.5 * (y1+y3);
      const double y23 = 0.5 * (y2+y3);
 
      const double z01 = 0.5 * (z0+z1);
      const double z02 = 0.5 * (z0+z2);
      const double z03 = 0.5 * (z0+z3);
      const double z12 = 0.5 * (z1+z2);
      const double z13 = 0.5 * (z1+z3);
      const double z23 = 0.5 * (z2+z3);
 
      lengths[0] = (x23-x01)*(x23-x01) + (y23-y01)*(y23-y01) + (z23-z01)*(z23-z01);
      lengths[1] = (x13-x02)*(x13-x02) + (y13-y02)*(y13-y02) + (z13-z02)*(z13-z02);
      lengths[2] = (x12-x03)*(x12-x03) + (y12-y03)*(y12-y03) + (z12-z03)*(z12-z03);
 
      Cerr<<"ici" <<lengths<<finl;
      const int id = imin_array(lengths);
 
      if (id == 0)
        {
          // on echange les sommets 1 et 2
          cells(cell,1) = s2;
          cells(cell,2) = s1;
        }
      else if (id == 1)
        {
          // rien a faire
        }
      else if (id == 2)
        {
          // on echange les sommets 2 et 3
          cells(cell,2) = s3;
          cells(cell,3) = s2;
        }
      else
        {
          Cerr << "Error in Orienter_Simplexes 'choose_internal_diagonal_for_tetrahedron()'" << finl;
          Cerr << "   Internal error in 'imin_array()'" << finl;
          Process::exit();
        }
    }
}
 
static void choose_internal_diagonal(Domaine& domain)
{
  const Nom& cell_type = domain.type_elem()->que_suis_je();
 
  Motcles understood_keywords(2);
  understood_keywords[0] = "Triangle";
  understood_keywords[1] = "Tetraedre";
 
  int rank = understood_keywords.search(cell_type);
  switch(rank)
    {
    case 0  :
      choose_internal_diagonal_for_triangle(domain);
      break;
    case 1  :
      choose_internal_diagonal_for_tetrahedron(domain);
      break;
    default :
      Cerr << "Error in Orienter_Simplexes.cpp 'choose_internal_diagonal()'" << finl;
      Cerr << "  Unknown cell type : " << cell_type << finl;
      Cerr << "  Orienter_Simplexes can only orient Triangles and Tetrahedrons" << finl;
      Process::exit();
    }
}
 
static void ensure_positive_volumes_for_triangle(Domaine& domain)
{
  const DoubleTab& nodes = domain.les_sommets();
  IntTab&           cells = domain.les_elems();
 
  const int nb_cells = cells.dimension(0);
  for (int cell=0; cell<nb_cells; ++cell)
    {
      const int s0 = cells(cell,0);
      const int s1 = cells(cell,1);
      const int s2 = cells(cell,2);
 
      const double x0 = nodes(s0,0);
      const double x1 = nodes(s1,0);
      const double x2 = nodes(s2,0);
 
      const double y0 = nodes(s0,1);
      const double y1 = nodes(s1,1);
      const double y2 = nodes(s2,1);
 
      const double area = 0.5 * ((x1-x0)*(y2-y0) - (x2-x0)*(y1-y0));
      if ( area < 0.)
        {
          // on echange les sommets 0 et 2
          cells(cell,0) = s2;
          cells(cell,2) = s0;
        }
    }
}
 
static void ensure_positive_volumes_for_tetrahedron(Domaine& domain)
{
  const DoubleTab& nodes = domain.les_sommets();
  IntTab&           cells = domain.les_elems();
 
  const int nb_cells = cells.dimension(0);
  for (int cell=0; cell<nb_cells; ++cell)
    {
      const int s0 = cells(cell,0);
      const int s1 = cells(cell,1);
      const int s2 = cells(cell,2);
      const int s3 = cells(cell,3);
 
      const double x0 = nodes(s0,0);
      const double x1 = nodes(s1,0);
      const double x2 = nodes(s2,0);
      const double x3 = nodes(s3,0);
 
      const double y0 = nodes(s0,1);
      const double y1 = nodes(s1,1);
      const double y2 = nodes(s2,1);
      const double y3 = nodes(s3,1);
 
      const double z0 = nodes(s0,2);
      const double z1 = nodes(s1,2);
      const double z2 = nodes(s2,2);
      const double z3 = nodes(s3,2);
 
      const double volume = (1./6.) * ( (x1-x0) * (y2-y0) * (z3-z0) +
                                        (x2-x0) * (y3-y0) * (z1-z0) +
                                        (x3-x0) * (y1-y0) * (z2-z0) -
                                        (z1-z0) * (y2-y0) * (x3-x0) -
                                        (x2-x0) * (z3-z0) * (y1-y0) -
                                        (y3-y0) * (x1-x0) * (z2-z0)   );
 
      if (volume < 0.)
        {
          // on echange les sommets 0 et 2
          cells(cell,0) = s2;
          cells(cell,2) = s0;
        }
    }
}
 
 
static void ensure_positive_volumes(Domaine& domain)
{
  const Nom& cell_type = domain.type_elem()->que_suis_je();
 
  Motcles understood_keywords(2);
  understood_keywords[0] = "Triangle";
  understood_keywords[1] = "Tetraedre";
 
  int rank = understood_keywords.search(cell_type);
  switch(rank)
    {
    case 0  :
      ensure_positive_volumes_for_triangle(domain);
      break;
    case 1  :
      ensure_positive_volumes_for_tetrahedron(domain);
      break;
    default :
      Cerr << "Error in Orienter_Simplexes.cpp 'ensure_positive_volumes()'" << finl;
      Cerr << "  Unknown cell type : " << cell_type << finl;
      Cerr << "  Orienter_Simplexes can only orient Triangles and Tetrahedrons" << finl;
      Process::exit();
    }
}
 
void Orienter_Simplexes::orient_domain(Domaine& domain)
{
  choose_internal_diagonal(domain);
  ensure_positive_volumes(domain);
}
 
Entree& Orienter_Simplexes::interpreter_(Entree& is)
{
  associer_domaine(is);
 
  Domaine& domain = domaine();
  Scatter::uninit_sequential_domain(domain);
  orient_domain(domain);
  Scatter::init_sequential_domain(domain);
 
  return is;
}