/* Auteur: Nicolas JANEY */
/* nicolas.janey@univ-fcomte.fr */
/* Septembre 2005 */
/* Un programme de deplacement d'une sphere */
/* par drag and drop et de controle clavier */
/* de la taille et de la position */
/* de cette sphere */
#include <stdio.h>
#include <stdlib.h>
#include <GL/glut.h>
#include <GL/gl.h>
#include <GL/glu.h>
static int lumiere = 0;
static int px = 100;
static int py = 100;
static int dx;
static int dy;
static int r = 10;
static GLfloat couleurBlanc[] = { 1.0F,1.0F,1.0F,1.0F };
static GLfloat couleurRouge[] = { 1.0F,0.0F,0.0F,1.0F };
static GLfloat couleurVert[] = { 0.0F,1.0F,0.0F,1.0F };
static GLfloat couleurBleu[] = { 0.0F,0.0F,1.0F,1.0F };
static GLfloat couleurNoir[] = { 0.0F,0.0F,0.0F,1.0F };
static int dragdrop = 0;
void init(void) {
GLfloat mat_shininess[] = { 50.0F };
GLfloat light0_position[] = { 1.0F,1.0F,1.0F,0.0F };
GLfloat light1_position[] = { -1.0F,1.0F,1.0F,0.0F };
GLfloat light2_position[] = { 1.0F,-1.0F,1.0F,0.0F };
glMaterialfv(GL_FRONT,GL_SPECULAR,couleurBlanc);
glMaterialfv(GL_FRONT,GL_SHININESS,mat_shininess);
glLightfv(GL_LIGHT0,GL_DIFFUSE,couleurRouge);
glLightfv(GL_LIGHT1,GL_DIFFUSE,couleurVert);
glLightfv(GL_LIGHT2,GL_DIFFUSE,couleurBleu);
glLightfv(GL_LIGHT0,GL_POSITION,light0_position);
glLightfv(GL_LIGHT1,GL_POSITION,light1_position);
glLightfv(GL_LIGHT2,GL_POSITION,light2_position);
glEnable(GL_LIGHT0);
glEnable(GL_LIGHT1);
glEnable(GL_LIGHT2);
glDepthFunc(GL_LESS);
glEnable(GL_DEPTH_TEST);
glEnable(GL_NORMALIZE);
glEnable(GL_AUTO_NORMAL);
glClearColor(0.0F,0.0F,0.0F,1.0F);
}
void scene(void) {
glPushMatrix();
glTranslatef(px,py,0.0F);
glutSolidSphere(r,60,60);
glPopMatrix();
}
void display(void) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
if ( lumiere )
glEnable(GL_LIGHTING);
else
glDisable(GL_LIGHTING);
glPushMatrix();
scene();
glPopMatrix();
glFlush();
int error = glGetError();
if ( error != GL_NO_ERROR )
printf("\nAttention erreur %d\n",error);
glutSwapBuffers();
}
void souris(int bouton,int etat,int x,int y) {
if ( etat == GLUT_DOWN )
if ( (px-x)*(px-x)+(py-y)*(py-y) < r*r ) {
dx = px-x;
dy = py-y;
dragdrop = 1; }
else {
px = x;
py = y;
glutPostRedisplay(); }
if ( etat == GLUT_UP )
dragdrop = 0;
}
void motion(int x,int y) {
if ( dragdrop ) {
px = x+dx;
py = y+dy;
glutPostRedisplay(); }
}
void keyboard(unsigned char key,int x,int y) {
switch ( key ) {
case 43 : r++;
glutPostRedisplay();
break;
case 45 : r--;
if ( r < 1.0F )
r = 1.0F;
glutPostRedisplay();
break;
case ' ' : lumiere = !lumiere;
glutPostRedisplay();
break;
case 0x1B : exit(0);
break; }
}
void special(int key,int x,int y) {
switch ( key ) {
case GLUT_KEY_RIGHT : px++;
glutPostRedisplay();
break;
case GLUT_KEY_LEFT : px--;
glutPostRedisplay();
break;
case GLUT_KEY_UP : py--;
glutPostRedisplay();
break;
case GLUT_KEY_DOWN : py++;
glutPostRedisplay();
break; }
}
void reshape(int w,int l) {
glViewport(0,0,w,l);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0,w,l,0,-100.0F,100.0F);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
int main(int argc,char **argv) {
glutInit(&argc,argv);
glutInitDisplayMode(GLUT_RGBA|GLUT_DEPTH|GLUT_DOUBLE);
glutInitWindowSize(300,300);
glutInitWindowPosition(50,50);
glutCreateWindow("Controles souris et clavier");
init();
glutReshapeFunc(reshape);
glutKeyboardFunc(keyboard);
glutSpecialFunc(special);
glutMouseFunc(souris);
glutMotionFunc(motion);
glutDisplayFunc(display);
glutMainLoop();
return(0);
}