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glteste.c
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glteste.c
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#include <GL/glut.h>
#include<math.h>
#include<stdio.h>
double user_theta = 0.;
double user_height = 7.;
double zdist = 0.;
void drawSphere(double r, int lats, int longs) {
int i, j;
for(i = 0; i <= lats; i++) {
double lat0 = M_PI * (-0.5 + (double) (i - 1) / lats);
double z0 = sin(lat0);
double zr0 = cos(lat0);
double lat1 = M_PI * (-0.5 + (double) i / lats);
double z1 = sin(lat1);
double zr1 = cos(lat1);
glBegin(GL_QUAD_STRIP);
for(j = 0; j <= longs; j++) {
double lng = 2 * M_PI * (double) (j - 1) / longs;
double x = cos(lng);
double y = sin(lng);
glNormal3f(x * zr0, y * zr0, z0);
glVertex3f(x * zr0, y * zr0, z0);
glNormal3f(x * zr1, y * zr1, z1);
glVertex3f(x * zr1, y * zr1, z1);
}
glEnd();
}
}
void computeLocation() {
double x = 2 * cos(0); // my x-, y-, and z-coordinates
double y = 2 * sin(0);
double z = 0;
double d = sqrt(x * x + y * y + z * z); // distance to origin
glMatrixMode(GL_PROJECTION); // Set projection parameters.
glLoadIdentity();
//glFrustum(-d * 0.5, d * 0.5, -d * 0.5, d * 0.5, d - 1.1, d + 1.1);
//gluLookAt(x, y, z, 0, 0, 0, 0, 0, 1);
// gluLookAt(
// 0.0, 8.0, -20.0, /* olho (0,8,60) */
// 0.0, 8.0, 0.0, /* centro (0,8,0) */
// 0.0, 1.0, 0.0); /* orientação (topo na direção Y) */
// gluPerspective( 40.0, /* ângulo de visão */
// 1.0, /* aspecto */
// 20.0, /* plano próximo */
// 1000.0); /* plano distante */
/* Modo de projeção */
gluPerspective( 40.0, /* ângulo de visão */
1.0, /* aspecto */
20.0, /* plano próximo */
1000.0); /* plano distante */
/* coordenadas do modelo */
glMatrixMode(GL_MODELVIEW);
/* posição da câmera */
gluLookAt(0.0, 8.0, 60.0, /* olho (0,8,60) */
0.0, 8.0, 0.0, /* centro(0,8,0) */
0.0, 1.0, 0.); /* orientação (topo na direção Y) */
}
// Initializes information for drawing within OpenGL.
void init() {
GLfloat sun_direction[] = { 0.0, 2.0, -1.0, 1.0 };
GLfloat sun_intensity[] = { 0.7, 0.7, 0.7, 1.0 };
GLfloat ambient_intensity[] = { 0.3, 0.3, 0.3, 1.0 };
glClearColor(1.0, 1.0, 1.0, 0.0); // Set window color to white.
computeLocation();
glEnable(GL_DEPTH_TEST); // Draw only closest surfaces
glEnable(GL_LIGHTING); // Set up ambient light.
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, ambient_intensity);
glEnable(GL_LIGHT0); // Set up sunlight.
glLightfv(GL_LIGHT0, GL_POSITION, sun_direction);
glLightfv(GL_LIGHT0, GL_DIFFUSE, sun_intensity);
glEnable(GL_COLOR_MATERIAL); // Configure glColor().
glColorMaterial(GL_FRONT, GL_AMBIENT_AND_DIFFUSE);
glDepthFunc(GL_LEQUAL);
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);
}
// Draws the current image.
void draw() {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); // Clear window.
glLoadIdentity();
gluLookAt(
0.0, 8.0, -20.0, /* olho (0,8,60) */
0.0, 8.0, 0.0, /* centro (0,8,0) */
0.0, 1.0, 0.0); /* orientação (topo na direção Y) */
glColor4f(1.0, 1.0, 1.0,1.0);
glEnable(GL_NORMALIZE);
glPushMatrix();
glTranslatef(user_theta, user_height, 0);
glShadeModel(GL_SMOOTH);
//drawSphere(1.0, user_height, user_theta);
glutSolidSphere(1., 30, 30);
glPopMatrix();
glColor4f(0.0, 1., 0.0,.7);
glEnable(GL_NORMALIZE);
glDisable(GL_TEXTURE_2D);
glTexCoord2f(0.,0.);
glBegin(GL_QUADS);
{
glNormal3f( 0., -1., -1);
glVertex3f( 7., 13., 2.01);
glNormal3f( 0., 1., 0);
glVertex3f( 3., 13., 2.01);
glNormal3f( 0., 1., 1.);
glVertex3f( 3., 15., 2.01);
glNormal3f( 0., -1., 0);
glVertex3f( 7., 15., 2.01);
}
glEnd();
glColor4f(1.0, 1.0, 1.0,1.0);
glEnable(GL_TEXTURE_2D);
glPushMatrix();
glTranslatef(-4, 13, zdist);
glColor4f(1.0, 0, 0, 1.0);
glutSolidSphere(2., 40, 40);
glPopMatrix();
glutSwapBuffers();
//glutPostRedisplay();
glFlush();
}
void timeStep(int n) {
glutTimerFunc(100, timeStep, 1);
glutPostRedisplay();
}
// Called when a "special" key is pressed
void special(int k, int x, int y) {
switch(k) {
case GLUT_KEY_UP: user_height += 0.1; break;
case GLUT_KEY_DOWN: user_height -= 0.1; break;
case GLUT_KEY_LEFT: user_theta += 0.1; break;
case GLUT_KEY_RIGHT: user_theta -= 0.1; break;
}
computeLocation();
glutPostRedisplay();
}
void keyb(unsigned char k, int x, int y) {
switch(k) {
case 'w': case 'W':
zdist += 0.1;
break;
case 's': case 'S':
zdist -= 0.1;
break;
case 'q': case 'Q':
exit(EXIT_SUCCESS);
}
computeLocation();
glutPostRedisplay();
}
int main(int argc, char **argv) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGB);
//glutInitWindowPosition(50, 100); // Set up display window.
glutInitWindowSize(900, 900);
glutCreateWindow("Sphere");
init();
glutDisplayFunc(draw);
glutTimerFunc(100, timeStep, 1);
glutSpecialFunc(special);
glutKeyboardFunc(keyb);
glutMainLoop();
return 0;
}