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| | #include <GL/glut.h>
int x_spin;
int y_spin;
int z_spin;
int dl_menger;
void menger(float left, float top, float far, float len, int level)
{
if (level <= 1)
{
glPushMatrix();
glTranslatef(left, top, far);
glutSolidCube(len);
glPopMatrix();
}
else
{
float i, j, k;
left -= len / 3.0; top += len / 3.0; far -= len / 3.0;
for (i = 0; i <= 2; i++)
for (j = 0; j <= 2; j++)
for (k = 0; k <= 2; k++)
if ((i == 1 && (j == 1 || k == 1)) || (j == 1 && k == 1))
continue;
else
menger(left + len * (i / 3.0), top - len * (j / 3.0),
far + len * (k / 3.0), len / 3.0, level - 1);
}
}
void init(int level)
{
if (level < 1) level = 4;
glShadeModel(GL_SMOOTH);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_COLOR_MATERIAL);
GLfloat position[] = { 150.0f, 150.0f, 150.0f, 1.0f };
glLightfv(GL_LIGHT0, GL_POSITION, position);
glColorMaterial(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE);
glClearColor(0, 0, 0, 0);
glColor3f( 1.0, 1.0, 1.0 );
dl_menger = glGenLists(1);
glNewList(dl_menger, GL_COMPILE);
menger(.0, .0, .0, 150.0, level);
glEndList();
}
void reshape(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(-150, 150, -150, 150, 150, -150);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
void display()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glRotatef(x_spin, 1.0, .0, .0);
glRotatef(y_spin, .0, 1.0, .0);
glRotatef(z_spin, .0, .0, 1.0);
glCallList(dl_menger);
glutSwapBuffers();
}
void keyboard( unsigned char key, int x, int y )
{
switch (key)
{
case 'w': x_spin -= 5; x_spin %= 360; break;
case 's': x_spin += 5; x_spin %= 360; break;
case 'a': y_spin -= 5; y_spin %= 360; break;
case 'd': y_spin += 5; y_spin %= 360; break;
case 'e': z_spin -= 5; z_spin %= 360; break;
case 'q': z_spin += 5; z_spin %= 360; break;
}
glutPostRedisplay();
}
int main(int argc, char* *argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
glutInitWindowPosition(100, 100);
glutInitWindowSize(500, 500);
glutCreateWindow(argv[0]);
glutReshapeFunc(reshape);
glutDisplayFunc(display);
glutKeyboardFunc(keyboard);
if (argc > 1) init(atoi(argv[1]));
else init(0);
glutMainLoop();
} |
