/* Auteur: Nicolas JANEY         */
/* nicolas.janey@univ-fcomte.fr  */
/* Mars 2002                     */
/* 4-Connexite et 8-Connexite    */

#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"
#include "ModuleReshape.h"
#include "ModuleFleche.h"

struct coord2D {
  double x;
  double y; } ;

struct segment {
  coord2D pi;
  coord2D pf; } ;

int aff = 0;
static segment seg = { { 5,3 },{ 35,16 } };

void pixel(int x,int y,float *c) {
  glColor4fv(c);
  glBegin(GL_QUADS) ;
  glVertex2i(x,y) ;
  glVertex2i(x+1,y) ;
  glVertex2i(x+1,y+1) ;
  glVertex2i(x,y+1) ;
  glEnd() ;
  glColor4fv(couleurNoir());
  glBegin(GL_LINE_LOOP) ;
  glVertex2i(x,y) ;
  glVertex2i(x+1,y) ;
  glVertex2i(x+1,y+1) ;
  glVertex2i(x,y+1) ;
  glEnd() ;
}

void dessine8Connexite() {
  int i,j;
  glColor4fv(couleurBleu()) ;
  glBegin(GL_LINES);
  for ( i = 1 ; i < 7 ; i++ ) {
    glVertex2d(1.0,i);
    glVertex2d(9.0,i); }
  for ( i = 1 ; i < 10 ; i++ ) {
    glVertex2d(i,1.0);
    glVertex2d(i,6.0); }
  glEnd() ;
  for ( i = 3 ; i < 6 ; i++ )
    for ( j = 2 ; j < 5 ; j++ )
      pixel(i,j,couleurVertFonce());
  pixel(4,3,couleurRouge());
  glColor4fv(couleurJaune());
  glPushMatrix();
  glTranslatef(4.5F,3.75F,0.0F);
  flecheEnVolume(0.0F,1.0F,0.0F,0.35F,0.6F,0.12F);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(4.5F,3.25F,0.0F);
  flecheEnVolume(0.0F,-1.0F,0.0F,0.35F,0.6F,0.12F);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(4.25F,3.5F,0.0F);
  flecheEnVolume(-1.0F,0.0F,0.0F,0.35F,0.6F,0.12F);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(4.75F,3.5F,0.0F);
  flecheEnVolume(1.0F,0.0F,0.0F,0.35F,0.6F,0.12F);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(4.75F,3.75F,0.0F);
  flecheEnVolume(0.8F,0.8F,0.0F,0.35F,0.6F,0.12F);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(4.25F,3.75F,0.0F);
  flecheEnVolume(-0.8F,0.8F,0.0F,0.35F,0.6F,0.12F);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(4.25F,3.25F,0.0F);
  flecheEnVolume(-0.8F,-0.8F,0.0F,0.35F,0.6F,0.12F);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(4.75F,3.25F,0.0F);
  flecheEnVolume(0.8F,-0.8F,0.0F,0.35F,0.6F,0.12F);
  glPopMatrix();
}

void dessine4Connexite() {
  int i;
  glColor4fv(couleurBleu()) ;
  glBegin(GL_LINES);
  for ( i = 1 ; i < 7 ; i++ ) {
    glVertex2d(1.0,i);
    glVertex2d(9.0,i); }
  for ( i = 1 ; i < 10 ; i++ ) {
    glVertex2d(i,1.0);
    glVertex2d(i,6.0); }
  glEnd() ;
  pixel(4,3,couleurRouge());
  pixel(5,3,couleurVertFonce());
  pixel(3,3,couleurVertFonce());
  pixel(4,2,couleurVertFonce());
  pixel(4,4,couleurVertFonce());
  glColor4fv(couleurJaune());
  glPushMatrix();
  glTranslatef(4.5F,3.75F,0.0F);
  flecheEnVolume(0.0F,1.0F,0.0F,0.35F,0.6F,0.12F);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(4.5F,3.25F,0.0F);
  flecheEnVolume(0.0F,-1.0F,0.0F,0.35F,0.6F,0.12F);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(4.25F,3.5F,0.0F);
  flecheEnVolume(-1.0F,0.0F,0.0F,0.35F,0.6F,0.12F);
  glPopMatrix();
  glPushMatrix();
  glTranslatef(4.75F,3.5F,0.0F);
  flecheEnVolume(1.0F,0.0F,0.0F,0.35F,0.6F,0.12F);
  glPopMatrix();
}

void display() {
  glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
  glPushMatrix();
  switch (aff) {
    case 0 : dessine4Connexite() ;
             break ;
    case 1 : dessine8Connexite() ;
             break ; }
  glPopMatrix();
  glFlush();
  glutSwapBuffers() ;
}

void key(unsigned char key,int x,int y) {
  switch ( key ) {
    case 0x1B : exit(0);
                break;
    case 0x0D : aff = (aff+1)%2;
                glutPostRedisplay();
                break; }
}

void myinit() {
  glClearColor(0.8F,0.8F,0.8F,1.0F);
}

int main(int argc,char **argv) {
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
  glutInitWindowSize(210,130); 
  glutInitWindowPosition(50,50); 
  glutCreateWindow("4/8 Connexité"); 
  myinit(); 
  creationMenuBasique();
  setParametresOrthoBasique(0.35,5.85,0.75,6.25,-50.0,50.0);
  glutReshapeFunc(reshapeOrthoBasique);
  glutKeyboardFunc(key);
  glutDisplayFunc(display);
  glutMainLoop();
  return(0);
}