【发布时间】：2020-06-01 18:09:33
【问题描述】：
我一直在尝试用 Python 和 Pygame 做一些很酷的东西来取乐。我对 Python 大致了解一两件事，但我是 Pygame 的初学者。 所以问题是：我创建了一个可移动的玩家和一个移动的敌人。当我按下空格键时，我想让玩家射击。我加载了一个 .png 图像，定义了一个射击函数，并让子弹在射击后保持移动。出于某种原因，当我调用该函数时，它什么也不做。它甚至没有给出错误。我知道我只能用当前代码和诸如此类的东西射出一颗子弹，但我只想让当前代码开始工作。
"""
player and enemy functions are defined above and work well, I didn't include
them in this post for the sake of saving everyone's time
"""
# bullet
bullet_pic = pygame.image.load("bullet.png")
bullet_pic_reverse = pygame.image.load("bullet reverse.png")
bullet_state = "nope"
def shoot(pic, x, y):
global bullet_state
bullet_state = "jes"
screen.blit(pic, (x, y + 30))
player_dir = player_pic # direction of the player (left or right)
enemy_dir = enemy_pic # direction of the enemy
enemyX_change = 2.5
running = True
while running:
screen.blit(back, (0, 0)) # background picture
player(player_dir, playerX, playerY)
enemy(enemy_dir, enemyX, enemyY)
pygame.display.update()
for event in pygame.event.get():
if event.type == pygame.QUIT or event.type == pygame.KEYDOWN and event.key == K_ESCAPE:
running = False
elif event.type == pygame.KEYDOWN:
# shooting
if event.key == K_SPACE:
if player_dir == player_pic:
bulletX = playerX + 100
bulletX_change = 20
bullet_dir = bullet_pic
else:
bulletX = playerX
bulletX_change = -20
bullet_dir = bullet_pic_reverse
shoot(bullet_dir, bulletX, playerY)
# player movement
hold = pygame.key.get_pressed()
if hold[K_LEFT] and playerX > 0:
playerX -= 7
player_dir = player_pic_reverse
if hold[K_RIGHT] and playerX < 1100:
playerX += 7
player_dir = player_pic
# enemy movement
enemyX += enemyX_change
if enemyX >= 1125:
enemyX_change = -2.5
enemy_dir = enemy_pic_reverse
elif enemyX <= 900:
enemyX_change = 2.5
enemy_dir = enemy_pic
# bullet constant movement
if bullet_state == "jes":
shoot(bullet_dir, bulletX, playerY)
bulletX += bulletX_change
【问题讨论】：
-
我在 else 语句之外调用它。每次按空格时，我都会调用它，而不管 player_dir 等于什么。当然，如果我错了，请纠正我。