# Hello PyOpenGL

from OpenGL.GL import *  
from OpenGL.GLUT import *  
from OpenGL.GLU import *  

def square():
    glBegin(GL_QUADS)  
    glVertex2f(100, 100)  
    glVertex2f(200, 100)  
    glVertex2f(200, 200)  
    glVertex2f(100, 200)  
    glEnd()
      
def init():  
    glViewport(0, 0, 500, 500)  
    glMatrixMode(GL_PROJECTION)  
    glLoadIdentity()  
    glOrtho(0.0, 500, 0.0, 500, 0.0, 1.0)  
    glMatrixMode (GL_MODELVIEW)  
    glLoadIdentity()  
  
def display():  
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)  
    glColor3f(1.0, 0.0, 0.0)    
    square()  
    glutSwapBuffers()  
  
def main(): 
    glutInit()  
    glutInitDisplayMode(GLUT_RGBA)  
    glutInitWindowSize(500, 500)  
    glutInitWindowPosition(0, 0)  
    glutCreateWindow("Hello PyOpenGL") 
    init() 
    glutDisplayFunc(display)  
    #glutIdleFunc(display)  
    glutMainLoop()


main()