sprite_system.py 文件源码

def __exit__(self, *args):
        """
        Sleeps for a variable amount of time (dependent on when it was last
        called), to give a consistent frame rate. If it cannot meet the desired
        frame rate (i.e. too much time has occurred since the last call), then
        it simply exits without blocking.
        """
        self.called += 1
        self.total_transit_time += monotonic() - self.enter_time
        if self.max_sleep_time >= 0:
            elapsed = monotonic() - self.last_time
            sleep_for = self.max_sleep_time - elapsed

            if sleep_for > 0:
                time.sleep(sleep_for)

        self.last_time = monotonic()