/* Mathematiques de l'informatique graphique    */
/* Facette triangulaire                         */
/*                                              */
/* Auteur: Nicolas JANEY                        */
/* nicolas.janey@univ-fcomte.fr                 */
/* Octobre 2010                                 */

#include <stdlib.h>
#include <stdio.h>
#include <math.h>

#include "Position3D.h"
#include "FacetteTriangulaire.h"
#include "Direction3D.h"

FacetteTriangulaire::FacetteTriangulaire(void) {
  p1 = new Position3D();
  p2 = new Position3D();
  p3 = new Position3D();
}

FacetteTriangulaire::FacetteTriangulaire(Position3D *s1,Position3D *s2,Position3D *s3) {
  p1 = new Position3D(s1);
  p2 = new Position3D(s2);
  p3 = new Position3D(s3);
}

FacetteTriangulaire::~FacetteTriangulaire(void) {
  delete(p1);
  delete(p2);
  delete(p3);
}

void FacetteTriangulaire::print(void) {
  p1->print();
  printf("\n");
  p2->print();
  printf("\n");
  p3->print();
  printf("\n");
}

Direction3D *FacetteTriangulaire::normale(void) {
  Direction3D *c1 = new Direction3D(p1,p2);
  Direction3D *c2 = new Direction3D(p1,p3);
  c1->produitVectoriel(c1,c2);
  c1->normalise();
  Direction3D *n = new Direction3D(c1);
  delete(c1);
  delete(c2);
  return(n);
}