/* Auteur: Nicolas JANEY                  */
/* nicolas.janey@univ-fcomte.fr           */
/* Novembre 2007                          */
/* Module de dessin des spheres           */

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

#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>

#include "ModuleSpheres.h"

#ifndef M_PI
#define M_PI 3.14159265358979323846264338327950288
#endif

void mySolidSphere(float rayon,int nlat,int nlon) {
  for ( int i = 0 ; i < nlat ; i++ ) {
    float a1 = -M_PI/2.0F + i*M_PI/nlat ;
    float a2 = a1 + M_PI/nlat ;
    float cs1 = cos(a1);
    float cs2 = cos(a2);
    float sn1 = sin(a1);
    float sn2 = sin(a2);
    glBegin(GL_QUAD_STRIP);
    for ( int j = 0 ; j <= nlon ; j++ ) {
      float a = j*2*M_PI/nlon;
      float x1 = cs1*cos(a);
      float z1 = cs1*sin(a);
      float x2 = cs2*cos(a);
      float z2 = cs2*sin(a);
      glNormal3f(x1,sn1,z1);
      glVertex3f(rayon*x1,rayon*sn1,rayon*z1);
      glNormal3f(x2,sn2,z2);
      glVertex3f(rayon*x2,rayon*sn2,rayon*z2); }
    glEnd(); }
}