Solar System

#include<windows.h>

#include<gl.h>

#include<glu.h>

#include<glut.h>

#include <stdlib.h>

static int year = 0, day = 0;

void init(void)

{

   glClearColor (0.0, 0.0, 0.0, 0.0);

   glShadeModel (GL_FLAT);

}

void display(void)

{

   glClear (GL_COLOR_BUFFER_BIT);

   glColor3f (1.0, 1.0, 1.0);

   glPushMatrix();

   glutWireSphere(1.0, 20, 16);   /* draw sun */

   glRotatef ((GLfloat) year, 0.0, 1.0, 0.0);

   glTranslatef (2.0, 0.0, 0.0);

   glRotatef ((GLfloat) day, 0.0, 1.0, 0.0);

   glutWireSphere(0.2, 10, 8);    /* draw smaller planet */

   glPopMatrix();

   glutSwapBuffers();

}

void reshape (int w, int h)

{

   glViewport (0, 0, (GLsizei) w, (GLsizei) h);

   glMatrixMode (GL_PROJECTION);

   glLoadIdentity ();

   gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 20.0);

   glMatrixMode(GL_MODELVIEW);

   glLoadIdentity();

   gluLookAt (0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0);

}

void keyboard (unsigned char key, int x, int y)

{

   switch (key) {

      case 'd':

         day = (day + 10) % 360;

         glutPostRedisplay();

         break;

      case 'D':

         day = (day - 10) % 360;

         glutPostRedisplay();

         break;

      case 'y':

         year = (year + 5) % 360;

         glutPostRedisplay();

         break;

      case 'Y':

         year = (year - 5) % 360;

         glutPostRedisplay();

         break;

      case 27:

         exit(0);

         break;

      default:

         break;

   }

}

int main(int argc, char** argv)

{

   glutInit(&argc, argv);

   glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);

   glutInitWindowSize (500, 500);

   glutInitWindowPosition (100, 100);

   glutCreateWindow (argv[0]);

   init ();

   glutDisplayFunc(display);

   glutReshapeFunc(reshape);

   glutKeyboardFunc(keyboard);

   glutMainLoop();

   return 0;

}