/* Auteur: Nicolas JANEY                      */
/* nicolas.janey@univ-fcomte.fr               */
/* Octobre 2006                               */
/* Animation par rotation autour de l'axe Ox  */
/* en C + OpenGL + GLUT                       */

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

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

#include "ModuleCylindres.h"

static float rx = 0.0F;

static int l = 1;
static int r = 1;

void key(unsigned char key,int x,int y) {
  switch ( key ) {
    case 'r'  : r = !r ;
                glutPostRedisplay();
                break;
    case 0x0D : l = !l ;
                glutPostRedisplay();
                break;
    case 0x1B : exit(0); }
}

void reshape(int tx,int ty) {
  glViewport(0,0,tx,ty);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glOrtho(4.5*(double) -tx/ty,4.5*(double) tx/ty,-4.5,4.5,-4.5,4.5) ;
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
}

void element() {
  glPushMatrix();
  glTranslatef(2.0F,0.0F,2.0F);
  solidCylindre(0.25F,3.0F,40,20);
  for ( int i = 0 ; i < 2 ; i++ ) {
    glTranslatef(0.0F,2.0F,0.0F);
    glutSolidCube(1.0F);
    glRotatef(90.0F,0.0F,0.0F,1.0F);
    glTranslatef(0.0F,2.0F,0.0F);
    solidCylindre(0.25F,3.0F,40,20); }
  glPopMatrix();
}

void scene() {
  glPushMatrix();
  if ( r )
    glRotatef(45.0F,1.0F,1.0F,0.0F);
  element();
  for ( int i = 1 ; i < 4 ; i++ ) {
    glPushMatrix();
    glRotatef(90.0F*i,1.0F,0.0F,0.0F);
    element();
    glPopMatrix(); }
  glPopMatrix();
}

void display(void) {
  if ( l )
    glEnable(GL_LIGHTING);
    else
    glDisable(GL_LIGHTING);
  glClearColor(0.8F,0.8F,0.8F,1.0F) ;
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT) ;
  glPushMatrix();
  glRotatef(rx,1.0F,0.0F,0.0F);
  scene();
  glPopMatrix();
  glFlush();
  glutSwapBuffers();
  int error = glGetError();
  if ( error != GL_NO_ERROR )
    printf("Attention, erreur OpenGL %d\n",error);
}

void init(void) {
  GLfloat l_pos[] = { 0.0F,0.0F,1.0F,0.0F };
  GLfloat c[4] = { 0.5F,0.2F,0.6F,1.0F };
  glMaterialfv(GL_FRONT,GL_DIFFUSE,c);
  glLightfv(GL_LIGHT0,GL_POSITION,l_pos);
  glEnable(GL_LIGHT0);
  glColor4fv(c) ;
  glEnable(GL_DEPTH_TEST);
  glEnable(GL_NORMALIZE);
}

void idle(void) {
  rx++;
  glutPostRedisplay();
}

int main(int argc,char **argv) {
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGBA|GLUT_DOUBLE);
  glutInitWindowSize(250,250); 
  glutInitWindowPosition(50,50); 
  glutCreateWindow("Animation par rotation");
  init(); 
  glutReshapeFunc(reshape);
  glutKeyboardFunc(key);
  glutIdleFunc(idle);
  glutDisplayFunc(display);
  glutMainLoop();
  return(0);
}