/* Mathematiques de l'informatique graphique    */
/* Coordonnees homogenes en 3D                  */
/*                                              */
/* Mars 2021                                    */

#include <stdio.h>

#include "CH3D.h"

#include "Pos3D.h"
#include "Dir3D.h"
#include "TG3D.h"

/* Construit la position origine                */

CH3D::CH3D(void) : x(0.0F),y(0.0F),z(0.0F),w(1.0F) {
}

/* Construit la CH3D (xp,yp,zp,wp)              */

CH3D::CH3D(float xp, float yp, float zp, float wp) : x(xp),y(yp),z(zp),w(wp) {
}

/* Construit un clone de la CH3D ch             */

CH3D::CH3D(CH3D *ch) : x(ch->x),y(ch->y),z(ch->z),w(ch->w) {
}

/* Destructeur                                  */

CH3D::~CH3D(void) {
}

/* Calcul de la transformation de this          */
/* par la transformation geometrique tg         */

void CH3D::mult(const TG3D& tg,CH3D& ch) {
  ch.x = this->x*tg.mat[0][0]+
         this->y*tg.mat[0][1]+
         this->z*tg.mat[0][2]+
         this->w*tg.mat[0][3];
  ch.y = this->x*tg.mat[1][0]+
         this->y*tg.mat[1][1]+
         this->z*tg.mat[1][2]+
         this->w*tg.mat[1][3];
  ch.z = this->x*tg.mat[2][0]+
         this->y*tg.mat[2][1]+
         this->z*tg.mat[2][2]+
         this->w*tg.mat[2][3];
  ch.w = this->x*tg.mat[3][0]+
         this->y*tg.mat[3][1]+
         this->z*tg.mat[3][2]+ 
         this->w*tg.mat[3][3];
}

/* Methode d'affichage texte                    */

void CH3D::print(void) {
  printf("%10.4f %10.4f %10.4f %10.4f",x,y,z,w);
}