提问：python飞船移动问题
飞船根据4个方向键上下左右移动，且移动到边框时从对面出来，比如移动到最右边然后从最左边出来
但是现在问题是左右移动没问题但是上下移动就实现不了，就比如移动到最上面时飞船不会从下面出来，而是一直往上就消失了，想了半天实在没找到问题所在，求大神解答
图片
代码
"""
项目： 飞船外星人游戏
作者： 硕
日期: 2019/7/13
版本： v_1.0
"""
import pygame
from pygame.sprite import Sprite
import sys
class setting:
"""
系统设置类：
背景长宽 背景颜色 飞船速度
"""
def __init__(self):
self.screen_width = 1200
self.screen_length = 800
self.ship_speed_factor = 3
self.bg_color = (230, 230, 230)
self.bullet_speed_factor = 1
self.bullet_width = 3
self.bullet_height = 15
self.bullet_color = 60, 60, 60
class Ship:
def __init__(self, screen, setting):
self.screen = screen
self.image = pygame.image.load("images/ship.bmp")
self.rect = self.image.get_rect()
self.screen_rect = screen.get_rect()
self.setting = setting
self.rect.centerx = self.screen_rect.centerx
self.rect.centery = self.screen_rect.bottom - 100
self.x = float(self.rect.centerx)
self.y = float(self.rect.centery)
self.moving_right = False
self.moving_left = False
self.moving_up = False
self.moving_down = False
def blitme(self):
self.screen.blit(self.image, self.rect)
def update(self, setting):
ai_setting = setting
if self.moving_right:
if self.rect.right == self.screen_rect.right:
self.x = 0
self.x += self.setting.ship_speed_factor
else:
self.x += self.setting.ship_speed_factor
elif self.moving_left:
if self.rect.left == self.screen_rect.left:
self.x = ai_setting.screen_width
self.x -= self.setting.ship_speed_factor
else:
self.x -= self.setting.ship_speed_factor
elif self.moving_up:
if self.rect.top == self.screen_rect.top:
self.y = ai_setting.screen_length
self.y -= self.setting.ship_speed_factor
else:
self.y -= self.setting.ship_speed_factor
elif self.moving_down:
if self.rect.bottom == self.screen_rect.bottom:
self.y = 0
self.y += self.setting.ship_speed_factor
else:
self.y += self.setting.ship_speed_factor
self.rect.centerx = self.x
self.rect.centery = self.y
def check_keydown_events(event, ship):
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_UP:
ship.moving_up = True
elif event.key == pygame.K_DOWN:
ship.moving_down = True
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
elif event.key == pygame.K_UP:
ship.moving_up = False
elif event.key == pygame.K_DOWN:
ship.moving_down = False
def check_events(ship):
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
elif event.type == pygame.KEYDOWN:
check_keydown_events(event, ship)
elif event.type == pygame.KEYUP:
check_keyup_events(event, ship)
def update_events(screen, ship, setting):
screen.fill(setting.bg_color)
ship.blitme()
pygame.display.flip()
def run_game():
pygame.init()
screen = pygame.display.set_mode((1200, 800))
pygame.display.set_caption("Alien Invasion")
ai_setting = setting()
ship = Ship(screen,ai_setting)
while True:
check_events(ship)
update_events(screen, ship, ai_setting)
ship.update(ai_setting)
def main():
run_game()
if __name__ == '__main__':
main()
