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alien.py
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alien.py
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from re import S
import pygame
from pygame.sprite import Sprite
class Alien(Sprite): # class to represent an alien
def __init__(self, ai_game):
# initialize alien and set its starting position
super().__init__()
self.screen = ai_game.screen
self.settings = ai_game.settings
# load alien image and set its rect position
self.image = pygame.image.load('images/alien.bmp')
self.rect = self.image.get_rect()
# alien starts at top left of screen
self.rect.x = self.rect.width
self.rect.y = self.rect.height
# store aliens horizontal position
self.x = float(self.rect.x)
def check_edges(self): # return true if aliens hit edges
screen_rect = self.screen.get_rect()
if self.rect.right >= screen_rect.right or self.rect.left <= 0:
return True
def update(self): # move the alien right or left
self.x += (self.settings.alien_speed * self.settings.fleet_direction)
self.rect.x = self.x