Tri_poly.cpp

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#include <Tri_poly.h>
#include <Domaine.h>
 
Implemente_instanciable_sans_constructeur(Tri_poly,"Tri_poly",Elem_poly_base);
 
// printOn et readOn
 
 
Sortie& Tri_poly::printOn(Sortie& s ) const
{
  return s << que_suis_je() << finl;
}
 
Entree& Tri_poly::readOn(Entree& s )
{
  return s ;
}
 
Tri_poly::Tri_poly()
{
}
 
/*! @brief remplit le tableau face_normales dans le Domaine_poly
 *
 */
void Tri_poly::normale(int num_Face, DoubleTab& Face_normales, const IntTab& Face_sommets, const IntTab& Face_voisins, const IntTab& elem_faces, const Domaine& domaine_geom) const
{
  const DoubleTab& les_coords = domaine_geom.coord_sommets();
 
  double x1, y1;
  double nx, ny;
  int no3;
  int f0;
  int n0 = Face_sommets(num_Face, 0);
  int n1 = Face_sommets(num_Face, 1);
  x1 = les_coords(n0, 0) - les_coords(n1, 0);
  y1 = les_coords(n0, 1) - les_coords(n1, 1);
  nx = -y1;
  ny = x1;
 
  // Orientation de la normale de elem1 vers elem2
  // pour cela recherche du sommet de elem1 qui n'est pas sur la Face
  int elem1 = Face_voisins(num_Face, 0);
  if ((f0 = elem_faces(elem1, 0)) == num_Face)
    f0 = elem_faces(elem1, 1);
  if ((no3 = Face_sommets(f0, 0)) != n0 && no3 != n1)
    { /* Do nothing */ }
  else
    no3 = Face_sommets(f0, 1);
 
  x1 = les_coords(no3, 0) - les_coords(n0, 0);
  y1 = les_coords(no3, 1) - les_coords(n0, 1);
 
  if ((nx * x1 + ny * y1) > 0)
    {
      Face_normales(num_Face, 0) = -nx;
      Face_normales(num_Face, 1) = -ny;
    }
  else
    {
      Face_normales(num_Face, 0) = nx;
      Face_normales(num_Face, 1) = ny;
    }
}