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alien.py
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import pygame
from pygame.sprite import Sprite
class Alien(Sprite):
"""单个外星人"""
def __init__(self,ai_settings,screen):
super(Alien,self).__init__()
self.screen=screen
self.ai_settings=ai_settings
self.image = pygame.image.load("images/alien.png")
self.rect=self.image.get_rect()
self.rect.x=self.rect.width
self.rect.y=self.rect.height
self.x=float(self.rect.x)
def blitme(self):
self.screen.blit(self.image,self.rect)
def check_edges(self):
#是否在边缘
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):
self.x += (self.ai_settings.alien_speed_facoor * self.ai_settings.fleet_direction)
self.rect.x=self.x