Trianguler.cpp

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#include <Trianguler.h>
#include <Domaine.h>
 
Implemente_instanciable(Trianguler,"Trianguler",Triangulation_base);
// XD triangulate interprete trianguler INHERITS_BRACE To achieve a triangular mesh from a mesh comprising rectangles (2
// XD_CONT triangles per rectangle). Should be used in VEF discretization. Principle: NL2
// XD_CONT \includeimage{{trianguler.jpeg}}
// XD attr domain_name ref_domaine domain_name REQ Name of domain.
 
/*! @brief Simple call to: Interprete::printOn(Sortie&)
 *
 * @param os Output stream.
 * @return The modified output stream.
 */
Sortie& Trianguler::printOn(Sortie& os) const
{
  return Interprete::printOn(os);
}
 
 
/*! @brief Simple call to: Interprete::readOn(Entree&)
 *
 * @param is Input stream.
 * @return The modified input stream.
 */
Entree& Trianguler::readOn(Entree& is)
{
  return Interprete::readOn(is);
}
 
/*! @brief @brief Triangulates all elements of a domain: transforms the geometric elements of the domain into triangles.
 *
 *     Currently only Rectangles can be triangulated
 *     (they are split into 2).
 *
 * @param domaine The domain whose elements are to be triangulated.
 */
void Trianguler::trianguler(Domaine& domaine) const
{
  if ((domaine.type_elem()->que_suis_je() == "Rectangle") || (domaine.type_elem()->que_suis_je() == "Quadrangle"))
    {
      domaine.typer("Triangle");
      IntTab& les_elems=domaine.les_elems();
      const DoubleTab& som =domaine.les_sommets();
      int oldsz=les_elems.dimension(0);
      IntTab new_elems(2*oldsz, 3);
      for(int i=0; i< oldsz; i++)
        {
          int i0=les_elems(i,0);
          int i1=les_elems(i,1);
          int i2=les_elems(i,2);
          int i3=les_elems(i,3);
 
          // NEW: cut along the shorter diagonal if they are not the same length
          double d1=0,d2=0;
          for (int dir=0; dir<dimension; dir++)
            {
              d1+=(som(i1,dir)-som(i2,dir))*(som(i1,dir)-som(i2,dir));
              d2+=(som(i3,dir)-som(i0,dir))*(som(i3,dir)-som(i0,dir));
            }
          int test;
          if (est_egal(d1,d2))
            test=(i%2)==0;
          else
            test=(d1<d2);
          if (test)
            {
              new_elems(i,0)=i0;
              new_elems(i,1)=i1;
              new_elems(i,2)=i2;
              new_elems(i+oldsz,0)=i1;
              new_elems(i+oldsz,1)=i2;
              new_elems(i+oldsz,2)=i3;
            }
          else
            {
              new_elems(i,0)=i0;
              new_elems(i,1)=i1;
              new_elems(i,2)=i3;
              new_elems(i+oldsz,0)=i0;
              new_elems(i+oldsz,1)=i2;
              new_elems(i+oldsz,2)=i3;
            }
          mettre_a_jour_sous_domaine(domaine,i,i+oldsz,1);
        }
      les_elems.ref(new_elems);
    }
  else
    {
      Cerr << "We do not yet know how to Trianguler the "
           << domaine.type_elem()->que_suis_je() <<"s"<<finl;
    }
}