如何解决PythonCrashCourse外来入侵船动
我的代码问题是船的运动很奇怪。有时,当我按向左或向右箭头键时,它的移动方向不正确。或者,船根本不动。在这个项目中,我具有模块Alien.py,alien_invasion.py,bullet.py,button.py,gamefunctions.py,game_stats.py,scoreboard.py,settings.py和ship.py。但是,我只会提供最相关的内容。
ship.py:
import pygame
class Ship():
def __init__(self,screen,ai_settings):
self.screen = screen
self.ai_settings = ai_settings
self.image = pygame.image.load('images/spaceship.png')
self.rect = self.image.get_rect()
self.screen_rect = screen.get_rect()
self.rect.centerx = self.screen_rect.centerx
self.rect.bottom = self.screen_rect.bottom
self.center = float(self.rect.centerx)
self.moving_right = False
self.moving_left = False
def update(self):
if self.moving_right and self.rect.right < self.screen_rect.right:
self.center += self.ai_settings.ship_speed_factor
if self.moving_left and self.rect.left > 0:
self.center -= self.ai_settings.ship_speed_factor
self.rect.centerx = self.center
def blitme(self):
self.screen.blit(self.image,self.rect)
def center_ship(self):
self.center = self.screen_rect.centerx
game_functions.py:
import sys
import pygame
from bullet import Bullet
from alien import Alien
from time import sleep
def check_keydown_events(event,ai_settings,ship,bullets):
if event.key == pygame.K_RIGHT:
ship.moving_right = True
elif event.key == pygame.K_LEFT:
ship.moving_left = True
elif event.key == pygame.K_SPACE:
fire_bullet(ai_settings,bullets)
def check_keyup_events(event,ship):
if event.key == pygame.K_RIGHT:
ship.moving_right = False
elif event.key == pygame.K_LEFT:
ship.moving_left = False
def check_events(ai_settings,stats,play_button,aliens,bullets):
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
elif event.type == pygame.KEYDOWN:
check_keydown_events(event,bullets)
elif event.type == pygame.KEYUP:
check_keyup_events(event,ship)
alien_invasion.py:
import sys
import pygame
import game_functions as gf
from settings import Settings
from ship import Ship
from pygame.sprite import Group
def run_game():
pygame.init()
ai_settings = Settings()
screen = pygame.display.set_mode((ai_settings.screen_width,ai_settings.screen_height))
screen = pygame.display.set_mode((1200,650))
pygame.display.set_caption("Alien Invasion")
while True:
gf.check_events(ai_settings,bullets)
if stats.game_active:
ship.update()
gf.update_bullets(ai_settings,sb,bullets)
gf.update_aliens(ai_settings,bullets)
gf.update_screen(ai_settings,bullets,play_button)
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
screen.fill(ai_settings.bg_color)
ship.blitme()
screen.fill(bg_color)
run_game()
解决方法
问题是由多次调用 pygame.event.get()
引起的。
pygame.event.get()
获取所有消息并将其从队列中删除pygame.event.get()
获取所有消息并将其从队列中删除。请参阅文档:
这将获取所有消息并将它们从队列中删除。 [...]
如果在多个事件循环中调用 pygame.event.get()
,则只有一个循环接收事件,但不会所有循环都接收所有事件。因此,似乎错过了一些事件。
获取事件一次并在多个循环中使用它们或将列表或事件传递给处理它们的函数和方法:
def check_events(event_list,ai_settings,screen,stats,play_button,ship,aliens,bullets):
for event in event_list:
if event.type == pygame.QUIT:
sys.exit()
elif event.type == pygame.KEYDOWN:
check_keydown_events(event,bullets)
elif event.type == pygame.KEYUP:
check_keyup_events(event,ship)
def run_game():
# [...]
while True:
event_list = pygame.event.get()
gf.check_events(event_list,bullets)
# [...]
for event in event_list :
if event.type == pygame.QUIT:
sys.exit()
# [...]
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