# Demo of keyboard-up function, and special-key functions

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

frame = 0
size = 0.5
animating = False

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

def keyboard(key, x, y):
    global animating
    if key == chr(27):
        sys.exit(0)
    elif key == 'a':
        animating = True

def keyboardUp(key, x, y):
    global animating
    if key == 'a':
        animating = False

def specialKey(key, x, y):
    if key == GLUT_KEY_FORWARD:
        print 'move forward'

def specialKeyUp(key, x, y):
    if key == GLUT_KEY_FORWARD:
        print 'stop moving forward'

startTime = time.time()

def idle():
    global frame, size, startTime
    frame = frame + 1
    if animating:
        size = math.sin(time.time())
    glutPostRedisplay()

glutInit([])
glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB)
glutInitWindowSize(200, 200)
glutInitWindowPosition(0,0)
glutCreateWindow(sys.argv[0])
glutDisplayFunc(draw)
glutKeyboardFunc(keyboard)
glutKeyboardUpFunc(keyboardUp)
glutSpecialFunc(specialKey)
glutSpecialUpFunc(specialKeyUp)
glutIgnoreKeyRepeat(1)
glutIdleFunc(idle)
glutMainLoop()