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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):
def __init__(self, all_settings, screen):
"""初始化外星人的起始位置"""
super(Alien, self).__init__()
self.screen = screen
self.all_setting = all_settings
# 加载外星人图像,获取其rect
self.image = pygame.image.load('images/alien_alpha.png')
self.rect = self.image.get_rect()
self.mask=pygame.mask.from_surface(self.image)
# 每个外星人的初始位置都在左上角附近
self.rect.x = self.rect.width
self.rect.y = self.rect.height
# 存储外星人精准位置
self.x = float(self.rect.x)
self.y = float(self.rect.y)
def blitme(self):
self.screen.blit(self.image, self.rect)
def check_edges(self):
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):
"""右移外星人"""
self.x += self.all_setting.alien_apeed_factor * self.all_setting.fleet_direction
self.rect.x = self.x