# Simple program written in class, demonstrating timer function

import sys, math, time
from OpenGL.GLUT import *
from OpenGL.GL import *
from OpenGL.GLU import *

size = 0.5
animating = False

def draw():
	global size
	glClear(GL_COLOR_BUFFER_BIT)
	glutWireTeapot(size)
	glFlush()

def keyboard(key, x, y):
	global animating
	print 'keyboard called, key = ', key, ord(key)
	if key == chr(27):
		sys.exit(0)
	elif key == 'a':
		animating = not animating

startTime = time.time()

def timer(val):
	global size, animating
	print 'timer called', val
	if animating:
		size = math.sin(time.time())
	glutTimerFunc(200, timer, val+1)
	glutPostRedisplay()

glutInit([])
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB)
glutInitWindowSize(200, 200)
glutInitWindowPosition(0,0)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutTimerFunc(200, timer, 0)
glutMainLoop()