Le source : CameraOpenGL02.cpp
/* Auteur: Nicolas JANEY */
/* nicolas.janey@univ-fcomte.fr */
/* Septembre 2007 */
/* Un programme OpenGL de dessin d'un cube */
/* en fil de fer visualise par differentes */
/* cameras */
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include "ModuleAxes.h"
/* Variables globales */
static int l = 1;
static int tc = 0;
static float zoom = 1.0F;
static float px = 0.0F;
static float py = 0.0F;
static float pz = 0.0F;
static float rx = 20.0F;
static float ry = -35.0F;
static int clic = 0;
static int mx;
static int my;
/* Fonction d'initialisation des parametres */
/* OpenGL ne changeant pas au cours de la vie */
/* du programme */
void init(void) {
const GLfloat l_pos[] = { 1.0F,1.0F,1.0F,0.0F };
const 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);
}
/* Scene dessinee */
void scene(void) {
glPushMatrix();
glutWireCube(1.3F);
glPopMatrix();
}
/* Fonction executee lors d'un rafraichissement */
/* de la fenetre de dessin */
void display(void) {
glClearColor(0.6F,0.6F,0.6F,1.0F) ;
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT) ;
if ( l )
glEnable(GL_LIGHTING);
else
glDisable(GL_LIGHTING);
/* Determination de la resolution */
/* de la fenetre d'affichage */
int tx = glutGet(GLUT_WINDOW_WIDTH);
int ty = glutGet(GLUT_WINDOW_HEIGHT);
/* Configuration du viewport d'affichage */
glViewport(0,0,tx,ty);
/* Choix et configuration de la camera */
/* de visualisation */
/* Placement de la scene devant la camera */
switch (tc) {
case 0 : glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho((double) -1.2*tx/ty,(double) 1.2*tx/ty,
-1.2,1.2,
-5.0,5.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
break;
case 1 : glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum((double) -0.65*tx/ty,(double) 0.65*tx/ty,
-0.65,0.65,
5.0,15.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0F,0.0F,-10.0F);
break;
case 2 : glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(14.7,(double) tx/ty,
5.0,15.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0F,0.0F,-10.0F);
break;
case 3 : glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum((double) -0.555*tx/ty,(double) 0.555*tx/ty,
-0.555,0.555,
2.0,10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0F,0.0F,-5.0F);
break;
case 4 : glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(31.0,(double) tx/ty,
2.0,10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0F,0.0F,-5.0F);
break;
case 5 : glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum((double) -0.325*tx/ty,(double) 0.325*tx/ty,
-0.325,0.325,
0.5,10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0F,0.0F,-2.5F);
break;
case 6 : glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(66.0,(double) tx/ty,
0.5,10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0F,0.0F,-2.5F);
break; }
/* Gestion de l'interactivite */
glPushMatrix();
{ glTranslatef(px,py,pz);
glRotatef(rx,1.0F,0.0F,0.0F);
glRotatef(ry,0.0F,1.0F,0.0F);
glScalef(zoom,zoom,zoom); }
/* Affichage de la scene */
axes();
scene();
glPopMatrix();
glFlush();
glutSwapBuffers();
int error = glGetError();
if ( error != GL_NO_ERROR )
printf("Attention, erreur OpenGL %d\n",error);
}
/* Fonction executee lors de la frappe */
/* d'une touche alphanumerique du clavier */
void keyboard(unsigned char key,int x,int y) {
switch ( key ) {
case 'x' : px -= zoom/50.0F;
glutPostRedisplay();
break;
case 'X' : px += zoom/50.0F;
glutPostRedisplay();
break;
case 'y' : py -= zoom/50.0F;
glutPostRedisplay();
break;
case 'Y' : py += zoom/50.0F;
glutPostRedisplay();
break;
case 'z' : pz -= 0.1F;
glutPostRedisplay();
break;
case 'Z' : pz += 0.1F;
glutPostRedisplay();
break;
case 'r' :
case 'R' : { static int tf = 0;
tf = (tf+1)%3;
switch (tf) {
case 0 : glutReshapeWindow(200,200);
break;
case 1 : glutReshapeWindow(400,150);
break;
case 2 : glutReshapeWindow(100,300);
break; } }
break;
case 0x0D : l = !l ;
glutPostRedisplay();
break;
case 0x20 : tc = (tc+1)%7 ;
glutPostRedisplay();
break;
case 0x1B : exit(0); }
}
/* Fonction executee lors de la frappe */
/* d'une touche non alphanumerique du clavier */
void special(int key,int x,int y) {
switch ( key ) {
case GLUT_KEY_PAGE_UP : zoom *= 1.01F;
glutPostRedisplay();
break;
case GLUT_KEY_PAGE_DOWN : zoom /= 1.01F;
glutPostRedisplay();
break;
case GLUT_KEY_UP : rx -= 1.0F;
glutPostRedisplay();
break;
case GLUT_KEY_DOWN : rx += 1.0F;
glutPostRedisplay();
break;
case GLUT_KEY_RIGHT : ry += 1.0F;
glutPostRedisplay();
break;
case GLUT_KEY_LEFT : ry -= 1.0F;
glutPostRedisplay();
break; }
}
/* Fonction executee lors d'un clic de souris */
/* dans la fenetre */
void mouse(int bouton,int etat,int x,int y) {
if ( bouton == GLUT_LEFT_BUTTON ) {
if ( etat == GLUT_DOWN ) {
clic = 1;
mx = x;
my = y; }
if ( etat == GLUT_UP ) {
clic = 0; } }
}
/* Fonction executee lors d'un deplacement */
/* de la souris sur la fenetre */
/* avec un bouton appuye */
void motion(int x,int y) {
if ( clic ) {
ry += (x-mx);
rx += (y-my);
mx = x;
my = y;
glutPostRedisplay(); }
}
/* Fonction principale */
int main(int argc,char **argv) {
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGBA|GLUT_DOUBLE|GLUT_DEPTH);
glutInitWindowSize(200,200);
glutInitWindowPosition(50,50);
glutCreateWindow("Cameras OpenGL");
init();
glutKeyboardFunc(keyboard);
glutSpecialFunc(special);
glutMouseFunc(mouse);
glutMotionFunc(motion);
glutDisplayFunc(display);
glutMainLoop();
return(0);
}
RETOUR