Control类

Control 是状态机类，main函数是游戏的主循环，setup_states函数设置游戏启动时运行的状态。

class Control():

def __init__(self):

self.screen = pg.display.get_surface()

self.done = False

self.clock = pg.time.Clock()

self.fps = 60

self.current_time = 0.0

self.keys = pg.key.get_pressed()

self.state_dict = {}

self.state_name = None

self.state = None

def setup_states(self, state_dict, start_state):

self.state_dict = state_dict

self.state_name = start_state

self.state = self.state_dict[self.state_name]

def main(self):

while not self.done:

self.event_loop()

self.update()

pg.display.update()

self.clock.tick(self.fps)

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event_loop函数负责监听输入（键盘输入和退出按钮），slef.keys 保存键盘输入。

update函数会检测状态的done值，调用状态的更新函数。如果检测到当前状态结束，就调用flip_state函数进行旧状态的清理操作，并转换到下一个状态。

def update(self):

self.current_time = pg.time.get_ticks(http://www.amjmh.com/v/)

if self.state.done:

self.flip_state()

self.state.update(self.screen, self.keys, self.current_time)

def flip_state(self):

previous, self.state_name = self.state_name, self.state.next

persist = self.state.cleanup()

self.state.startup(self.current_time, persist)

def event_loop(self):

for event in pg.event.get():

if event.type == pg.QUIT:

self.done = True

elif event.type == pg.KEYDOWN:

elif event.type == pg.KEYUP: