class Settings():
	"""存储alien_invasion的所有设置的类"""

	def __init__(self):
		"""初始化游戏的静态设置"""
		#屏幕设置
		self.screen_width = 1000
		self.screen_height = 500
		self.bg_color = (230, 230, 230)

		#飞船的设置
		self.ship_limit = 4

		#子弹的设置
		self.bullet_width = 3
		self.bullet_height = 15
		self.bullet_color = (60, 60, 60)
		self.bullets_allowed = 3

		#外星人的设置

		#以什么样的速度加快游戏节奏
		self.speedup_scale = 1.2
		#外星人点数提高速度
		self.score_scale = 1.5

		self.initialize_dynamic_settings()

	def initialize_dynamic_settings(self):
		"""初始化随游戏进行而变化的设置"""
		self.ship_speed_factor = 3
		self.bullet_speed_factor = 6
		self.alien_speed_factor = 1
		self.fleet_drop_speed = 3

		# fleet_direction为1表示向右移，为-1表示向左移
		self.fleet_direction = 1

		#记分
		self.alien_points = 50

	def increase_speed(self):
		"""提高速度设置和外星人点数"""
		self.ship_speed_factor *= self.speedup_scale
		self.bullet_speed_factor *= self.speedup_scale
		self.alien_speed_factor *= self.speedup_scale
		self.fleet_drop_speed *= self.speedup_scale

		self.alien_points = int(self.alien_points * self.score_scale)
