外星人移动只有一个框架 图片不动？

Question

这个是外星人 我对比着书重写了一遍还是这样 我也不知道哪里有错 就把alien全部发出来了
import pygame
from pygame.sprite import Sprite
class Alien(Sprite):

def __init__(self,screen,alien_settings):
    super(Alien, self).__init__()
    self.screen=screen
    self.alien_settings=alien_settings
    self.image=pygame.image.load('images/alien.bmp')
    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):
    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.rect.x+=

self.alien_settings.alien_speed_factor
*self.alien_settings.fleet_direction

这个是game——faction
def updte_screen(screen,alien_settings,ship,bullets,alien,aliens):

screen.fill(alien_settings.screen_color)
for bullet in bullets.sprites():
    bullet.draw_bullet()
ship.blitme()
alien.blitme()
aliens.draw(screen)
pygame.display.flip()

def update_bullet(bullets,aliens):

bullets.update()
for bullet in bullets.copy():
    if bullet.rect.bottom <= 0:
        bullets.remove(bullet)
print(len(bullets))
collisions = pygame.sprite.groupcollide(bullets, aliens, True, True)

def get_number_alien_x(alien_settings,alien_width):

available_space_x=alien_settings.screen_width-2*alien_width
number_aliens_x=int(available_space_x/(2*alien_width))
return number_aliens_x

def get_number_rows(alien_settings, ship_height, alien_height):

available_space_y = (alien_settings.screen_high -
                     (3 * alien_height) - ship_height)
number_rows = int(available_space_y / (2 * alien_height))
return number_rows

def create_alien(alien_settings,screen,aliens,alien_number,row_number):

alien=Alien(screen,alien_settings)
alien_width=alien.rect.width
alien.x=alien_width+2*alien_width*alien_number
alien.rect.x=alien.x
alien.rect.y = alien.rect.height + 2 * alien.rect.height * row_number
aliens.add(alien)

def create_fleet(alien_settings,screen,ship,aliens):

alien=Alien(screen,alien_settings)
number_aliens_x = get_number_alien_x(alien_settings,alien.rect.width)
number_rows = get_number_rows(alien_settings, ship.rect.height,
                              alien.rect.height)
for row_number in range(number_rows):
    for alien_number in range(number_aliens_x):
        create_alien(alien_settings,screen,aliens,alien_number,row_number)

def check_fleet_edges(alien_settings,aliens):

for alien in aliens.sprites():
    if alien.check_edges():
        change_fleet_direction(alien_settings,aliens)
        break

def change_fleet_direction(alien_settings,aliens):

for alien in aliens.sprites():
    alien.rect.y += alien_settings.fleet_drop_speed
alien_settings.fleet_direction *= -1

Answer 1

外星人 update 方法错了

class Alien(Sprite):
    def __init__(self,screen,alien_settings):
        super().__init__()
        ...
    
    def update(self):
        self.x += (self.ai_settings.alien_speed_factor * self.ai_settings.fleet_direction)
        self.rect.x = self.x