class Settings():
	'''存储《外星人入侵》的所有设置类'''

	def __init__(self):
		# type: () -> object
		"""初始游戏静态设置"""
		# 屏幕设置
		self.screen_width = 1200
		self.screen_height = 800
		self.bg_color = (230,230,230)

		# 飞船设置
		self.ship_limit = 3

		# 子弹设置
		self.bullet_width = 3
		self.bullet_height = 15
		self.bullet_color = 60, 60, 60
		self.bullet_allowed = 5

		# 外星人设置
		self.fleet_drop_speed = 10

		# 以什么样的速度加快游戏节奏
		self.speedup_scale = 1.1

		self.initialize_dynamic_settings()

	def initialize_dynamic_settings(self):
		"""初始化随游戏进行而变化的量"""
		self.ship_speed_factor = 10.5
		self.alien_speed_factor = 10
		self.bullet_speed_factor = 5

		# fleet_direction为1是向右，fleet_direction为-1是向左
		self.fleet_direction = 1

	def increase_speed(self):
		"""提高速度设置"""
		self.ship_speed_factor *= self.speedup_scale
		self.bullet_speed_factor *= self.speedup_scale
		self.alien_speed_factor += self.speedup_scale