/* Auteur: Nicolas JANEY          */
/* nicolas.janey@univ-fcomte.fr   */
/* Avril 2001                     */
/* Programmation du calcul        */
/* d'une courbe de Bezier OpenGL  */

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

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

#include "ModuleCouleurs.h"
#include "ModuleFont.h"
#include "ModuleManipulateur.h"
#include "ModuleMenus.h"
#include "ModuleReshape.h"

static GLfloat pts[7][3] = { 
  {3,2,-1},{-4,5,-4}, 
  {-5,4,3},{-1,-3,-2}, 
  {4,-1,0}}; 

void traceBezierGL(void) {
  glMap1f(GL_MAP1_VERTEX_3,
          0.0,1.0,3,5,&pts[0][0]); 
  glEnable(GL_MAP1_VERTEX_3); 
  glColor4fv(couleurCyan()); 
  glBegin(GL_POINTS); 
  for ( int i = 0 ; i <= 100 ; i++ ) 
    glEvalCoord1f((GLfloat) i/100.0F); 
  glEnd(); 
}
  
void display(void) { 
  int i; 
  glClear(GL_COLOR_BUFFER_BIT|
          GL_DEPTH_BUFFER_BIT); 
  glPushMatrix();
  glEnable(GL_DEPTH_TEST);
  manipulateurSouris();
  manipulateurClavier();
  traceBezierGL() ;
  glPointSize(5.0); 
  glColor4fv(couleurJaune()); 
  glBegin(GL_POINTS); 
  for ( i = 0 ; i < 5 ; i++ ) 
    glVertex3fv(&pts[i][0]); 
  glEnd(); 
  glPointSize(1.0); 
  glColor4fv(couleurMagenta()); 
  glBegin(GL_LINE_STRIP); 
  for ( i = 0 ; i < 5 ; i++ ) 
    glVertex3fv(&pts[i][0]); 
  glEnd(); 
  glDisable(GL_DEPTH_TEST);
  glColor4fv(couleurJaune()); 
  for ( i = 0 ; i < 5 ; i++ )  {
    placeFontCursor(pts[i][0]+0.3F,
                    pts[i][1]+0.3F,
                    pts[i][2]+0.3F);
    simpleBitmapOutput("%d",i); }
  glPopMatrix();
  glFlush();
  glutSwapBuffers();
} 

void myinit(void) { 
  glClearColor(0.0,0.0,0.0,1.0); 
  glShadeModel(GL_FLAT); 
  glDepthFunc(GL_LESS);
} 
  
int main(int argc,char **argv) {
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
  glutInitWindowSize(300,300); 
  glutInitWindowPosition(50,50); 
  glutCreateWindow("Courbe de Bezier"); 
  myinit(); 
  creationMenuBasique();
  setParametresOrthoBasique(-7.0,7.0,-7.0,7.0,-500.0,500.0);
  setManipulateurDistance(1.0F);
  glutReshapeFunc(reshapeOrthoBasique);
  glutKeyboardFunc(keyBasique);
  glutSpecialFunc(specialBasique);
  glutMotionFunc(motionBasique);
  glutMouseFunc(sourisBasique);
  glutDisplayFunc(display);
  glutMainLoop();
  return(0);
}