#include <stdio.h>
#include <stdlib.h>

#include <GL/glut.h>


static GLfloat spin = 0.0;

void init( void ) {

  glClearColor( 0.0, 1.0, 0.0, 0.0 );
  glShadeModel( GL_FLAT );
}


void display( void ) {

  glClear( GL_COLOR_BUFFER_BIT );
  glPushMatrix();
  glRotatef( spin, 0.0, 0.0, 1.0 );
  glColor3f( 1.0, 1.0, 1.0 );
  glRectf( -25.0, -25.0, 25.0, 25.0 );
  glColor3f(1.0, 0.0, 0.0);
  glRectf(-5.0, -5.0, 5.0, 5.0);

  glPointSize(4.0);
  glColor3f(0.0, 0.0, 1.0);
  glBegin(GL_POINTS);
  glVertex2f(6.0, 2.0);
  glVertex2f(15.0, 14.0);
  glVertex2f(12.0, 20.0);
  glVertex2f(-3.0, 17.0);
  glEnd();
  

  glPopMatrix();
  glutSwapBuffers();
}  


void spinDisplay( void ) {

  spin = spin + 2.0;
  if( spin > 360.0 )
    spin = spin - 360.0;
  glutPostRedisplay();
}


void reshape(int w, int h) {

  glViewport( 0, 0, (GLsizei) w, (GLsizei) h);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glOrtho(-50.0, 50.0, -50.0, 50.0, -1.0, 1.0 );
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
}


void mouse( int button, int state, int x, int y ) {

  switch( button ) {
  case GLUT_LEFT_BUTTON:
    if (state == GLUT_DOWN)
      glutIdleFunc(spinDisplay);
    break;
  case GLUT_RIGHT_BUTTON:
    if (state == GLUT_DOWN)
      glutIdleFunc(NULL);
    break;
  default:
    break;
  }
}



int main( int argc, char** argv ) {

  glutInit(&argc, argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
  glutInitWindowSize(250, 250);
  glutInitWindowPosition(100, 100);
  glutCreateWindow("rock-it");
  init();
  glutDisplayFunc(display);
  glutReshapeFunc(reshape);
  glutMouseFunc(mouse);
  glutMainLoop();

  return 0;
}