import?pygame
from?pygame.sprite?import?Sprite

class?Alien（Sprite）:
????“““表示單個外星人的類“““

????def?__init__（self?ai_settings?screen）:
????????“““初始化外星人，并初始化其起始位置“““
????????super（Alien?self）.__init__（）
????????self.screen?=?screen
????????self.ai_settings?=?ai_settings

????????#?加載外星人并設置其?rect?屬性.
????????self.image?=?pygame.image.load（‘images/alien.bmp‘）
????????self.rect?=?self.image.get_rect（）

????????#?每一個外星人初始位置都在屏幕左上角附近.
????????self.rect.x?=?self.rect.width?#?將左邊距設置為外星人寬度
????????self.rect.y?=?self.rect.height??#將上邊距設置外星人高度

????????#?存儲外星人準確位置.
????????self.x?=?float（self.rect.x）
????????
????def?check_edges（self）:
????????“““如果外星人在屏幕邊緣?返回?true.“““
????????screen_rect?=?self.screen.get_rect（）
????????if?self.rect.right?>=?screen_rect.right:
????????????return?True
????????elif?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2019-03-26?17:51??Myalien_Invasion\
?????目錄???????????0??2019-03-26?17:51??Myalien_Invasion\.idea\
?????文件?????????408??2019-03-26?13:29??Myalien_Invasion\.idea\chapter_14.iml
?????文件?????????138??2019-03-26?13:28??Myalien_Invasion\.idea\encodings.xml
?????文件?????????294??2019-03-26?13:28??Myalien_Invasion\.idea\misc.xml
?????文件?????????279??2019-03-26?13:28??Myalien_Invasion\.idea\modules.xml
?????文件???????14240??2019-03-26?17:51??Myalien_Invasion\.idea\workspace.xml
?????文件????????1379??2019-03-26?16:06??Myalien_Invasion\alien.py
?????文件????????1705??2019-03-26?16:49??Myalien_Invasion\alien_invasion.py
?????文件????????1273??2019-03-26?15:21??Myalien_Invasion\bullet.py
?????文件????????1260??2019-03-26?16:48??Myalien_Invasion\button.py
?????文件????????8705??2019-03-26?17:22??Myalien_Invasion\game_functions.py
?????文件?????????544??2019-03-26?17:16??Myalien_Invasion\game_stats.py
?????目錄???????????0??2019-03-26?13:28??Myalien_Invasion\images\
?????文件???????10494??2016-06-15?02:16??Myalien_Invasion\images\alien.bmp
?????文件????????8694??2016-06-15?02:16??Myalien_Invasion\images\ship.bmp
?????文件????????2861??2019-03-26?17:25??Myalien_Invasion\scoreboard.py
?????文件????????1765??2019-03-26?17:13??Myalien_Invasion\settings.py
?????文件????????1711??2019-03-26?16:36??Myalien_Invasion\ship.py
?????目錄???????????0??2019-03-26?16:27??Myalien_Invasion\__pycache__\
?????文件????????1484??2019-03-26?16:27??Myalien_Invasion\__pycache__\alien.cpython-37.pyc
?????文件????????1240??2019-03-26?15:39??Myalien_Invasion\__pycache__\bullet.cpython-37.pyc
?????文件????????1250??2019-03-26?15:39??Myalien_Invasion\__pycache__\button.cpython-37.pyc
?????文件????????6276??2019-03-26?16:27??Myalien_Invasion\__pycache__\game_functions.cpython-37.pyc
?????文件?????????808??2019-03-26?13:29??Myalien_Invasion\__pycache__\game_stats.cpython-37.pyc
?????文件????????2631??2019-03-26?13:29??Myalien_Invasion\__pycache__\scoreboard.cpython-37.pyc
?????文件????????1440??2019-03-26?16:27??Myalien_Invasion\__pycache__\settings.cpython-37.pyc
?????文件????????1480??2019-03-26?15:39??Myalien_Invasion\__pycache__\ship.cpython-37.pyc