Projections orthographique et en perspective
Projection en perspective avec rapprochement de la scène
Projection en perspective : très grosses déformations
/* Auteur: Nicolas JANEY */
/* nicolas.janey@univ-fcomte.fr */
/* Avril 2001 */
/* Les modes de projection d'OpenGL */
#include <stdio.h>
#include <stdlib.h>
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>
#include "ModuleCouleurs.h"
#include "ModuleManipulateur.h"
#include "ModuleMenus.h"
static int proj = 0 ;
static int ww ;
static int hh ;
static float zoomPersp = 1.0F ;
static float zoomParal = 1.0F ;
static float ouverture = 1.0F ;
void projection(void) {
if ( proj ) {
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60.0*ouverture,(double) ww/hh,0.5,200.0);
glMatrixMode(GL_MODELVIEW);
glTranslatef(0.0F,0.0F,-5.0F*zoomPersp);
setManipulateurDistance(5.0F*zoomPersp); }
else {
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-2.5*zoomParal,2.5*zoomParal,-2.5*zoomParal*(double) hh/ww,2.5*zoomParal*(double) hh/ww,-25,25);
glMatrixMode(GL_MODELVIEW);
setManipulateurDistance(1.0F); }
}
void display(void) {
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glPushMatrix();
glColor4fv(couleurBlanc());
projection();
glPushMatrix();
manipulateurSouris();
manipulateurClavier();
glTranslatef(-1.0F,0.0F,0.0F) ;
glMaterialfv(GL_FRONT,GL_DIFFUSE,couleurJaune());
glutSolidCube(2.0);
glTranslatef(2.0F,0.0F,0.0F) ;
glMaterialfv(GL_FRONT,GL_DIFFUSE,couleurBleu());
glutSolidSphere(1.3,36,36);
glPopMatrix();
glPopMatrix();
glFlush();
glutSwapBuffers();
}
void myinit(void) {
glShadeModel(GL_SMOOTH);
glDepthFunc(GL_LESS) ;
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_AUTO_NORMAL);
glEnable(GL_NORMALIZE);
}
void reshape(int w, int h) {
glViewport(0,0,w,h);
ww = w ;
hh = h ;
}
void key(unsigned char key,int x,int y) {
if ( keyManipulateur(key,x,y) )
glutPostRedisplay();
else
switch ( key ) {
case 'o' : ouverture *= 1.02F ;
glutPostRedisplay();
break;
case 'O' : ouverture /= 1.02F ;
glutPostRedisplay();
break;
case 45 : zoomPersp *= 1.01F ;
zoomParal *= 1.01F ;
glutPostRedisplay();
break;
case 43 : zoomPersp /= 1.01F ;
zoomParal /= 1.01F ;
glutPostRedisplay();
break;
case 'P' :
case 'p' : proj =(proj+1)%2 ;
glutPostRedisplay();
break; }
}
int main(int argc,char **argv) {
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
glutInitWindowSize(200,200);
glutInitWindowPosition(50,50);
glutCreateWindow("Visualisations");
myinit();
creationMenuBasique();
glutKeyboardFunc(key);
glutSpecialFunc(specialBasique);
glutMotionFunc(motionBasique);
glutMouseFunc(sourisBasique);
glutReshapeFunc(reshape);
glutDisplayFunc(display);
glutMainLoop();
return(0);
}