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# 开发日期: 2024/4/26
import pygame
from pygame . sprite import Sprite
class Alien ( Sprite ) :
""" 表示单个外星人的属性 """
def __init__ ( self , ai_settings , screen ) :
""" 初始化外星人并设置其初始位置 """
super ( Alien , self ) . __init__ ( )
self . screen = screen
self . ai_settings = ai_settings
# 加载外星人图像，
self . image = pygame . image . load ( ' images/al.png ' )
self . rect = self . image . get_rect ( )
# 每个外星人最初都是在屏幕左上角
self . rect . x = self . rect . width
self . rect . y = self . rect . height
# 存储外星人的准确位置
self . x = float ( self . rect . x )
def draw ( self ) :
""" 在指定位置绘制外星人 """
self . screen . blit ( self . image , self . rect )
def check_edges ( self ) :
""" 如果外星人位于屏幕边缘， """
screen_rect = self . screen . get_rect ( )
if self . rect . right > = screen_rect . right :
return True
elif self . rect . left < = 0 :
return True
def update ( self ) :
""" 向右移动外星人 """
self . x + = ( self . ai_settings . alien_speed_factor * self . ai_settings . fleet_direction )
self . rect . x = self . x
