#include <GL/glut.h>

void init(void)
{
  glClearColor(1.0, 1.0, 1.0, 0.0);

  glMatrixMode(GL_PROJECTION);
  gluOrtho2D(-400, 400.0, -400.0, 400.0);
}

void transform(void)
{
  glClear(GL_COLOR_BUFFER_BIT);

  glMatrixMode(GL_MODELVIEW);

  glLoadIdentity();
  glColor3f(0.9, 0.9, 0.9);
  glRecti(200,-50,300,50);

  glColor3f(0.6, 0.6, 0.6);
  glRotatef(90, 0,0,1);
  glRecti(200,-50,300,50);

  glLoadIdentity();
  glColor3f(0.4,0.4,0.4);
  glTranslatef(150,0,0);
  glRotatef(90, 0,0,1);
  glTranslatef(-150,0,0);
  glRecti(200,-50,300,50);
  
  glFlush();
}

int main(int argc, char** argv)
{
  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
  glutInitWindowPosition(0, 0);
  glutInitWindowSize(800, 800);
  glutCreateWindow("An Transform Program");

  init();
  glutDisplayFunc(transform);

  glutMainLoop();

  return 1;
}