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


def draw():
	glClear(GL_COLOR_BUFFER_BIT)
	glFlush()   # This cheat is necessary to make the single-buffer problem clear on my iBook
	glBegin(GL_TRIANGLES)
	glVertex2f(0.0, 0.0)
	glVertex2f(0.4, 0.0)
	glVertex2f(0.8, 0.8)
	glEnd()
	glFlush()
	glutPostRedisplay()

def keyboard(key, x, y):
	if key == chr(27):
		sys.exit(0)

glutInit([])
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB)
glutInitWindowSize(300, 300)
glutInitWindowPosition(0,0)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutMainLoop()