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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, game):
super().__init__()
self.screen = game.screen
self.settings = game.settings
# Load the alien image and set its rect attribute.
self.image = pygame.image.load('assets/alien.bmp')
self.rect = self.image.get_rect()
# Start each new alien near the top left of the screen.
self.rect.x = self.rect.width
self.rect.y = self.rect.height
# Store the alien's exact horizontal position.
self.x = float(self.rect.x)
def check_edges(self):
"""Return True if alien is at edge of screen."""
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