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alien.py
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alien.py
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import pygame
from pygame.sprite import Sprite
class Alien(Sprite) :
"""表示单个外星人的类"""
def __init__(self,ai_game):
"""初始化外星人并设置其初始位置"""
super().__init__()
self.screen = ai_game.screen
#加载外星人图像并设置其rect属性
self.image = pygame.image.load('images/alien.bmp')
self.rect = self.image.get_rect()
#每个外星人最初都在屏幕左上角附近
self.rect.x = self.rect.width
self.rect.y = self.rect.height
#存储外星人的精确水平位置
self.x = float(self.rect.x)
#外星人设置
self.settings = ai_game.settings
def check_edges(self):
"""如果外星人位于屏幕边缘,就返回True"""
screen_rect = self.screen.get_rect()
if self.rect.right >= screen_rect.right or self.rect.left <= 0:
return True
def update(self):
"""向左或者向右移动外星人"""
self.x += (self.settings.alien_speed * self.settings.fleet_direction)
self.rect.x = self.x