/* Auteur: Nicolas JANEY              */
/* nicolas.janey@univ-fcomte.fr       */
/* Fevrier 2002                       */
/* Utilisation des cameras en OpenGL  */

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

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

#include "ModuleCouleurs.h"
#include "ModuleMenus.h"

static float anglex = 0.0F ;
static int scn = 0 ;
static int anim = 0 ;

void wireCylindre(float r,float h,int n,int m) {
  glPushMatrix();
  GLUquadricObj *qobj = gluNewQuadric();
  gluQuadricDrawStyle(qobj,GLU_LINE);
  gluCylinder(qobj,r,r,h,n,m);
  gluDeleteQuadric(qobj);  
  glPopMatrix();
}

void scene(void) {
  glPushMatrix();
  glutWireSphere(0.1,18,18);
  glTranslatef(3.0f,3.0f,0.0f);
  glRotatef(anglex,1.0F,0.0F,0.0F) ;
  glutWireCube(2.0);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(-3.0f,3.0f,0.0f);
  glRotatef(anglex,1.0F,0.0F,0.0F) ;
  glutWireSphere(1.0,18,18);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(3.0f,-3.0f,0.0f);
  glRotatef(anglex-90.0F,1.0F,0.0F,0.0F) ;
  wireCylindre(1.0,2.0,18,18);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(-3.0f,-3.0f,0.0f);
  glRotatef(anglex-90.0F,1.0F,0.0F,0.0F) ;
  glutWireCone(1.0,2.0,18,18);
  glPopMatrix();
}

void display(void) {
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  gluPerspective(20,1.0,5.0,40.0);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  switch ( scn ) {
    case 0 : glRotatef(180.0F,-0.325F,-0.325F,-0.888F);
             glTranslatef(-20.0F,-20.0F,-20.0F);
             break;
    case 1 : glRotatef(-54.7356F,-1.0F,1.0F,0.0F);
             glTranslatef(-20.0F,-20.0F,-20.0F);
             break;
    case 2 : gluLookAt(20.0,20.0,20.0,0.0,0.0,0.0,0.0,1.0,0.0);
             break; }
  scene();
  glFlush();
  glutSwapBuffers();
}

void myinit (void) {
  glClearColor(0.5F,0.5F,0.5F,0.0F);
  glColor4fv(couleurBlanc());
  glEnable(GL_DEPTH_TEST);
}

void reshape(int w, int h) {
  glViewport(0,0,w,h);
}

void idle(void) {
  anglex += 0.25F;
  glutPostRedisplay() ;
}

void key(unsigned char key,int x,int y) {
  switch ( key) {
    case 0x0D : scn = (scn+1) % 3 ;
                glutPostRedisplay();
                break ;
    case 0x20 : anim = !anim ;
                glutIdleFunc((anim) ? idle : NULL);
                anglex = 0.0F;
                glutPostRedisplay();
                break ;
    case 0x1B : exit(0) ;
                break; }
}

int main(int argc,char **argv) {
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
  glutInitWindowSize(250,250); 
  glutInitWindowPosition(50,50); 
  glutCreateWindow("Cameras pour la perspective"); 
  myinit(); 
  creationMenuBasique();
  glutKeyboardFunc(key);
  glutReshapeFunc(reshape);
  glutDisplayFunc(display);
  glutMainLoop();
  return(0);
}