我正试图在PyGame中进行外星人入侵，当我blit飞船和子弹时，一切都很顺利，但当我试图从精灵组中绘制外星人时，游戏突然落后了。我试过使用convert()函数，但即使使用了它，它仍然滞后。main：
import sys
import pygame
from settings import Settings
from ship import Ship
from bullet import Bullet
from alien import Alien
class AlienInvasion:
"""Overall class to manage game assests and behavior"""
def __init__(self):
"""Initialize the game and create resources"""
pygame.init()
self.settings = Settings()
self.screen = pygame.display.set_mode((self.settings.screen_width, self.settings.screen_height))
pygame.display.set_caption("Alien Invasion")
self.ship = Ship(self)
self.bullets = pygame.sprite.Group()
self.aliens = pygame.sprite.Group()
def run_game(self):
"""Start the main loop for the game"""
while True:
clock.tick(60)
self._check_events()
self.ship.update()
self._update_bullets()
self._create_fleet()
self._update_aliens()
self._update_screen()
def _check_events(self):
#watch for keyboard and mouse events
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
elif event.type == pygame.KEYDOWN:
self._check_keydown_events(event)
elif event.type == pygame.KEYUP:
self._check_keyup_events(event)
def _check_keydown_events(self, event):
"""Respond to keypress"""
if event.key == pygame.K_RIGHT:
self.ship.moving_right = True
elif event.key == pygame.K_LEFT:
self.ship.moving_left = True
elif event.key == pygame.K_UP:
self.ship.moving_up = True
elif event.key == pygame.K_DOWN:
self.ship.moving_down = True
elif event.key == pygame.K_q:
sys.exit()
elif event.key == pygame.K_SPACE:
self._fire_bullet()
self.ship.firing = True
def _check_keyup_events(self, event):
if event.key == pygame.K_RIGHT:
self.ship.moving_right = False
elif event.key == pygame.K_LEFT:
self.ship.moving_left = False
def _fire_bullet(self):
if len(self.bullets) < self.settings.bullets_allowed:
new_bullet = Bullet(self)
self.bullets.add(new_bullet)
def _update_bullets(self):
self.bullets.update()
#delete bullets
for bullet in self.bullets.copy():
if bullet.rect.bottom <= 0:
self.bullets.remove(bullet)
def _update_aliens(self):
"""Update position of aliens"""
self.aliens.update()
def _create_fleet(self):
alien = Alien(self)
alien_width,alien_height = alien.rect.size
available_space_x = self.settings.screen_width - (2 * alien_width)
number_aliens_x = available_space_x // (2 * alien_width)
#determine number of rows that fit on the screen
ship_height = self.ship.rect.height
available_space_y = self.settings.screen_height - (3*alien_height) - ship_height
number_aliens_y = available_space_y // (2* alien_height)
for row_number in range(number_aliens_y):
for alien_number in range(number_aliens_x):
self._create_alien(alien_number, row_number)
def _create_alien(self,alien_number,row_number):
"""Create alien and place it in a row"""
alien = Alien(self)
alien_width, alien_height = alien.rect.size
alien.x = alien_width + 2 * alien_width * alien_number
alien.rect.y = alien_height + 2 * alien_width * row_number
alien.rect.x = alien.x
self.aliens.add(alien)
def _update_screen(self):
self.screen.fill(self.settings.bg_color)
self.ship.blitme()
for bullet in self.bullets.sprites():
bullet.draw_bullet()
self._create_fleet()
self.aliens.draw(self.screen)
pygame.display.flip()
if __name__ == '__main__':
ai = AlienInvasion()
ai.run_game(
ALien文件这是存储外星人的外星人类。我已经将我的图像转换为.bmp文件，我也尝试过使用convert()函数，但它仍然滞后。
import pygame
from pygame.sprite import Sprite
class Alien(Sprite):
"""class that represents a single alien in a fleet"""
def __init__(self, ai_game):
#intialize alien and set position
super().__init__()
self.screen = ai_game.screen
self.settings = ai_game.settings
#load alien image
self.image = pygame.image.load('images/alien.bmp').convert()
self.rect = self.image.get_rect()
#start the alien at the top left of the screen
self.rect.x = self.rect.width
self.rect.y = self.rect.height
#store alien exact horizontal position
self.x = float(self.rect.x)
def update(self):
#move alien to the right
self.x += self.settings.alien_speed
self.rect.x = self.x
问题是您在每一帧中创建舰队。因此，在每一帧中，新的外星人都会被附加到组中，你必须画出比必要的多得多的外星人。更糟糕的是，'images/alien.bmp'加载在类Alien的构造函数中，因此每帧中必须加载多个图像：
class AlienInvasion: # [...] def _update_screen(self): # [...] self._create_fleet() # <---- self.aliens.draw(self.screen)
当构建第一个外星人时，我建议将图像加载一次，加载到类变量一次：
(请参见类和实例变量(
class Alien(Sprite):
alienimage = None
"""class that represents a single alien in a fleet"""
def __init__(self, ai_game):
# [...]
#load alien image
if self.alienimage == None:
self.alienimage = pygame.image.load('images/alien.bmp').convert()
self.image = self.alienimage
# [...]
在主应用程序循环之前创建车队：
class AlienInvasion:
# [...]
def run_game(self):
self._create_fleet() # <---- ADD
"""Start the main loop for the game"""
while True:
clock.tick(60)
self._check_events()
self.ship.update()
self._update_bullets()
# self._create_fleet() <---- DELETE
self._update_aliens()
self._update_screen()
# [...]
def _update_screen(self):
# [...]
# self._create_fleet() <---- DELETE
self.aliens.draw(self.screen)