settings.py

#!/usr/bin/env python
# -*- coding:utf-8 -*-
class Settings():
    """存储《外星人入侵》所有设置的类"""

    def __init__(self):
        """初始化游戏的设置"""
        # 屏幕的设置
        self.screen_width = 1200
        self.screen_height = 800
        self.bg_color = (192, 192, 192)

        # 飞船的位置
        #self.ship_speed_factor = 3
        self.ship_limit = 3

        # 子弹的设置
        #self.bullet_speed_factor = 6
        self.bullet_width = 300
        self.bullet_height = 15
        self.bullet_color = 255, 100, 0
        self.bullets_allowed = 3

        #外星人的设置
        #self.alien_speed_factor = 1
        self.fleet_drop_speed = 10
        # fleet_direction为1表示向右移，为-1表示向左移
        #self.fleet_direction = 1

        # 以什么样的速度加快游戏节奏
        self.speedup_scale = 1.1
        # 外星人点数的提高速度
        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 = 1.5
        self.bullet_speed_factor = 3
        self.alien_speed_factor = 1

        # fleet_direction为1表示向右，-1表示向左
        self.fleet_direction = 1
        # 计分
        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.alien_points = int(self.alien_points * self.score_scale)