class Game(object):
def __init__(self):
self.screen = pygame.display.set_mode((800,600))
self.screen_rect = self.screen.get_rect()
self.font = pygame.font.SysFont(None, 16)
self.clock = GameClock(
30, 120,
update_callback=self.update,
frame_callback=self.draw,
paused_callback=self.pause,
)
self.draw_line = pygame.draw.line
self.ucolor = Color('grey')
self.dcolor = Color('white')
self.pcolor = Color('blue')
self.running = True
self.paused = False
self.ball = pygame.Surface((30,30))
self.ball.fill(Color(255,0,0))
self.ball_start = 300
self.ball_rect = self.ball.get_rect(x=self.ball_start)
self.ball_from = self.ball_start
self.ball_to = self.ball_start
self.elapsed = 0.
self.nupdates = 0
self.n10updates = 0
self.utime = pygame_time()
self.dtime = pygame_time()
self.ptime = pygame_time()
self.uerror = 0
self.derror = 0
self.umax = 0
self.dmax = 0
self.ptxt = None
self.msgs = []
# Recur every second
self.clock.schedule_interval(self.per_second, 1.)
# Recur every 10 seconds
self.clock.schedule_interval(self.per_10_second, 10.)
# Recur every second, for two iterations
self.clock.schedule_interval(self.recur, 1., 2)
def run(self):
clock = self.clock
while self.running:
clock.tick()
def update(self, dt):
# Track accuracy. For example, at 30 ups, each update+frames set
# should not exceed 33 ms.
t = pygame_time()
utime = self.utime
mydt = (t - utime)/1000.
self.uerror += dt - mydt
self.utime = t
for e in pygame.event.get():
if e.type == KEYDOWN:
self.on_key_down(e)
self.ball_from = self.ball_to
self.ball_to += dt * 200
## waste many ms / update
if SIM_LOAD:
pygame.time.wait(self.umax)
def draw(self, interp):
t = pygame_time()
#
self.screen.fill((0,0,0))
x = self.screen_rect.centerx
y = 10
error = min(max(self.uerror/1000,-100),100)
self.draw_line(self.screen, self.ucolor, (x,y), (x+error,y), 5)
y += 10
txt = self.font.render('DT Update ms error: {0:+0.3f}'.format(self.uerror), True, self.ucolor)
r = txt.get_rect(centerx=x,top=y)
self.screen.blit(txt, r)
y += 20
self.ball_rect.y = y
dx = (self.ball_to - self.ball_from) * self.clock.interpolate
self.ball_rect.centerx = self.ball_from + dx
self.screen.blit(self.ball, self.ball_rect)
for i,msg in enumerate(self.msgs):
r = msg.get_rect(x=3)
r.y = 3 + (3+r.h) * i
self.screen.blit(msg, r)
pygame.display.flip()
## waste many ms / frame
if SIM_LOAD:
pygame.time.wait(self.dmax)
def pause(self):
for e in pygame.event.get():
if e.type == KEYDOWN:
self.on_key_down(e)
msg = 'Time is PAUSED' if self.paused else 'Time is Running'
self.msgs[0] = self.font.render(msg, True, Color('grey'))
self.draw(self.clock.interpolate)
def per_second(self, *args):
# flip the ball and performance meter every second
self.nupdates += 1
del self.msgs[:]
for msg in (
'Time is PAUSED' if self.paused else 'Time is Running',
'{0:d} second elapsed'.format(self.nupdates),
'{0:d} 10-second elapsed'.format(self.n10updates),
'{0:.1f} / {1:.1f} ups/max'.format(self.clock.ups, self.clock.max_ups),
'{0:.1f} / {1:.1f} fps/max'.format(self.clock.fps, self.clock.max_fps),
'{0:d} update waste ms'.format(self.umax),
'{0:d} draw waste ms'.format(self.dmax),
'{0:d} use wait'.format(self.clock.use_wait),
'{0:f} DT update'.format(self.clock.dt_update),
'{0:f} cost of update'.format(self.clock.cost_of_update),
'{0:f} DT frame'.format(self.clock.dt_frame),
'{0:f} cost of frame'.format(self.clock.cost_of_frame),
):
self.msgs.append(self.font.render(msg, True, Color('grey')))
self.ball_from = self.ball_start
self.ball_to = self.ball_from + self.clock.dt_update * 200
def per_10_second(self, *args):
self.n10updates += 10
msg = '{0:d} 10-second elapsed'.format(self.n10updates)
self.msgs[2] = self.font.render(msg, True, Color('grey'))
def recur(self, *args):
print 'RECUR'
def on_key_down(self, e):
if e.key == K_SPACE:
# toggle max FPS: 0 vs. 60
self.clock.max_fps = 0 if self.clock.max_fps else 120
if DEBUG: print '\n--- max_fps:{0:d} ---'.format(self.clock.max_fps)
elif e.key == K_UP:
if e.mod & KMOD_SHIFT:
# increment simulated update load
self.umax += 5
if DEBUG: print '\n--- umax +5:{0:d} ---'.format(self.umax)
else:
# increment simulated draw load
self.dmax += 5
if DEBUG: print '\n--- dmax +5:{0:d} ---'.format(self.dmax)
elif e.key == K_DOWN:
if e.mod & KMOD_SHIFT and self.umax:
# decrement simulated update load
self.umax -= 5
if DEBUG: print '\n--- umax -5:{0:d} ---'.format(self.umax)
elif self.dmax:
# decrement simulated draw load
self.dmax -= 5
if DEBUG: print '\n--- dmax -5:{0:d} ---'.format(self.dmax)
elif e.key == K_d:
# toggle debug messages
gameclock.DEBUG = not gameclock.DEBUG
if gameclock.DEBUG:
print '\n--- debug on ---'
else:
print '\n--- debug off ---'
elif e.key == K_p:
if self.paused:
# pause clock
self.paused = False
self.clock.resume()
else:
# unpause clock
self.paused = True
self.clock.pause()
elif e.key == K_w:
# toggle use_wait
self.clock.use_wait = not self.clock.use_wait
if self.clock.use_wait:
if DEBUG: print '\n--- wait on---'
else:
if DEBUG: print '\n--- wait off ---'
elif e.key == K_ESCAPE:
quit()
