def _base(self, framerate=None, use_accurate_delay=False):
if framerate:
endtime = int((1.0 / framerate) * 1000.)
self._rawpassed = sdl.SDL_GetTicks() - self._last_tick
delay = endtime - self._rawpassed
_try_init()
if use_accurate_delay:
delay = _accurate_delay(delay)
else:
delay = max(delay, 0)
sdl.SDL_Delay(delay)
nowtime = sdl.SDL_GetTicks()
self._timepassed = nowtime - self._last_tick
self._fps_count += 1
self._last_tick = nowtime
if not framerate:
self._rawpassed = self._timepassed
if not self._fps_tick:
self._fps_count = 0
self._fps_tick = nowtime
elif self._fps_count >= 10:
try:
self._fps = (self._fps_count /
((nowtime - self._fps_tick) / 1000.0))
except ZeroDivisionError:
self._fps = float('inf')
self._fps_count = 0
self._fps_tick = nowtime
return self._timepassed
def _accurate_delay(ticks):
if ticks <= 0:
return 0
start = sdl.SDL_GetTicks()
if ticks >= WORST_CLOCK_ACCURACY:
delay = (ticks - 2) - (ticks % WORST_CLOCK_ACCURACY)
if delay >= WORST_CLOCK_ACCURACY:
sdl.SDL_Delay(delay)
# hog CPU for a bit to get the delay just right
delay = ticks - (sdl.SDL_GetTicks() - start)
while delay > 0:
delay = ticks - (sdl.SDL_GetTicks() - start)
return sdl.SDL_GetTicks() - start
def wait(milliseconds):
""" wait(milliseconds) -> time
pause the program for an amount of time
"""
try:
milliseconds = int(milliseconds)
except (ValueError, TypeError):
raise TypeError("wait requires one integer argument")
_try_init()
milliseconds = max(milliseconds, 0)
start = sdl.SDL_GetTicks()
sdl.SDL_Delay(milliseconds)
return sdl.SDL_GetTicks() - start
