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alien.py
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alien.py
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import pygame, os
from pygame.sprite import Sprite
class Alien(Sprite):
"""A class to represent a single alient in the fleet."""
def __init__(self, ai_settings, screen):
"""Initialize the alient and set its starting position."""
super().__init__()
self.screen = screen
self.ai_settings = ai_settings
# Load the alien and set its rect attribute
self.image = pygame.image.load(
os.path.dirname(__file__) + "/images/alien.bmp")
self.rect = self.image.get_rect()
# Start each new alien near the top left of the scren.
self.rect.x = self.rect.width
self.rect.y = self.rect.height
# Store the alient's exact position
self.x = float(self.rect.x)
def blitme(self):
"""Draw the alien as its current location."""
self.screen.blit(self.image, self.rect)
def check_edges(self):
"""Return True if alient is at edge of screen."""
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, *args):
"""Move the alien right or left."""
self.x += (self.ai_settings.alien_speed_factor *
self.ai_settings.fleet_direction)
self.rect.x = self.x