settings.py

class Settings:
    """放置外星人入侵游戏的所有设置的类"""
    def __init__(self):
        """初始化游戏的设置"""
        #屏幕设置
        self.screen_width = 1200
        self.screen_height = 800
        self.bg_color = (230,230,230)
        self.ship_speed = 1.5
        #接下来设置子弹
        self.bullet_speed = 2.5
        self.bullet_width = 3
        self.bullet_height = 15
        self.bullet_color = (60,60,60)
        self.bullet_allowed = 3
        #外星人设置
        self.alien_speed = 5.0
        self.fleet_drop_speed = 10
        #fleet_direction 为1表示向右移动 -1表示向左移动
        self.fleet_direction = 1
        self.ship_limit = 3

        #以什么速度加快游戏的节奏
        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设置"""
        self.ship_speed = 1.5
        self.bullet_speed = 2.5
        self.alien_speed = 1.0
        #记分设置
        self.alien_points = 50
        #fleet_direction 为1向右，为-1表示向左
        self.fleet_direction = 1

    def increase_speed(self):
        """提高速度设置的值"""
        self.ship_speed *= self.speedup_scale
        self.bullet_speed *= self.speedup_scale
        self.alien_speed *= self.speedup_scale