from pyglet import window
from pyglet import text
from pyglet import clock
from pyglet import font

w = window.Window(fullscreen=True)

class Timer(text.Label):
    def stop(self):
        self.__time = 0
    def reset(self):
        self.__time = 0
        self.__running = False
        self.text = '00:00'
    def animate(self, dt):
        if self.__running:
            self.__time += dt
            m, s = divmod(self.__time, 60)
            self.text = '%02d:%02d'%(m, s)

    def on_text(self, text):
        if text == ' ':
            self.__running = not self.__running
            return True
        return False

ft = font.load('', 360)
timer = Timer('00:00', ft, x=w.width//2, y=w.height//2,
    valign='center', halign='center')
timer.reset()
clock.schedule(timer.animate)
w.push_handlers(timer)

while not w.has_exit:
    w.dispatch_events()
    clock.tick()
    w.clear()
    timer.draw()
    w.flip()


'''A full-screen minute:second timer.  Leave it in charge of your conference
lighting talks.

After 5 minutes, the timer goes red.  This limit is easily adjustable by
hacking the source code.

Press spacebar to start, stop and reset the timer.
'''

import pyglet

window = pyglet.window.Window(fullscreen=True)

class Timer(object):
    def __init__(self):
        self.label = pyglet.text.Label('00:00', font_size=360, 
                                       x=window.width//2, y=window.height//2,
                                       valign='center', halign='center')
        self.reset()

    def reset(self):
        self.time = 0
        self.running = False
        self.label.text = '00:00'
        self.label.color = (255, 255, 255, 255)

    def update(self, dt):
        if self.running:
            self.time += dt
            m, s = divmod(self.time, 60)
            self.label.text = '%02d:%02d' % (m, s)
            if m >= 5:
                self.label.color = (180, 0, 0, 255)
@window.event
def on_key_press(symbol, modifiers):
    if symbol == pyglet.window.key.SPACE:
        if timer.running:
            timer.running = False
        else:
            if timer.time > 0:
                timer.reset()
            else:
                timer.running = True
    elif symbol == pyglet.window.key.ESCAPE:
        window.close()

@window.event
def on_draw():
    window.clear()
    timer.label.draw()

timer = Timer()
pyglet.clock.schedule_interval(timer.update, 1)
pyglet.app.run()


Update timer for new label. Clean up a bit and use more pyglet 1.1 features.