# Example for in-class assignment - clear a window to different colors as keys are pressed
import sys, random
from OpenGL.GLUT import *
from OpenGL.GL import *
from OpenGL.GLU import *

r,g,b = 0,0,0

def draw():
    glClearColor(r,g,b,0)
    glClear(GL_COLOR_BUFFER_BIT)
    glFlush()

def keyboard(key, x, y):
    if key == chr(27):
        sys.exit(0)
    else:
        global r,g,b
        r,g,b = random.uniform(0,1), random.uniform(0,1), random.uniform(0,1)
        glutPostRedisplay()

glutInit([])
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB)
glutInitWindowSize(500, 500)
glutInitWindowPosition(0,0)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutMainLoop()