如何使用 pygame 库在 python 中使角色向上、向下、向左、向右射击？

import pygame

pygame.init()
win = pygame.display.set_mode((500, 500))
pygame.display.set_caption("game lupa, tank")
bg = pygame.image.load('images\\bg.jpg')
player = pygame.image.load('images\\tank_player_left.png')
player_left = pygame.image.load('images\\tank_player_left.png')
player_rigth = pygame.image.load('images\\tank_player_rigth.png')
player_down = pygame.image.load('images\\tank_player_down.png')
player_up = pygame.image.load('images\\tank_player_up.png')
patron1 = pygame.image.load('images\\patron1.png')
width = 60
height = 55
x = 250
y = 400
speed = 3
lastMove = 'right'
UDMove = 'up'
clock = pygame.time.Clock()
bullets = []
bullets1 = []
class snaryad():
    def __init__(self, x, y, radius, color, facing, upf):
        self.upf = upf
        self.x = x + 10 if upf in ['left','right'] else x
        self.y = y if upf in ['left','right'] else y + 10
        self.radius = radius - 1
        self.facing = facing
        self.color = color
        self.vel = 10 * facing
    def draw(self, win):
        pygame.draw.circle(win, self.color, (self.x, self.y), self.radius)
def drawWindow():
    for bullet in bullets:
        bullet.draw(win)
runGame = True
while runGame:
    clock.tick(30)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
    for bullet in bullets:
        if bullet.upf in ['left','right'] and bullet.x < 500 and bullet.x > 0:
            bullet.x += bullet.vel
        elif bullet.upf in ['up','down'] and bullet.y < 500 and bullet.y > 0:
            bullet.y += bullet.vel
        else:
            bullets.pop(bullets.index(bullet))
    keys = pygame.key.get_pressed()
    if keys[pygame.K_SPACE]:
        if lastMove == 'right':
            facing = 1
        elif lastMove == 'left':
            facing = -1
        elif lastMove == 'up':
            facing = -1
        elif lastMove == 'down':
            facing = 1
        if len(bullets) < 10:
            bullets.append(snaryad(round(x + width // 2), round(y + height // 2), 8, (0, 0, 255), facing, lastMove))
    if keys[pygame.K_LEFT] and x > 1:
        x -= speed
        player = player_rigth
        lastMove = 'left'
    elif keys[pygame.K_RIGHT] and x < 450:
        x += speed
        player = player_left
        lastMove = 'right'
    elif keys[pygame.K_UP] and y > 1:
        y -= speed
        player = player_up
        lastMove = 'up'
    elif keys[pygame.K_DOWN] and y < 450:
        y += speed
        player = player_down
        lastMove = 'down'
    win.blit(bg, (0, 0))
    drawWindow()
    win.blit(player, (x, y))
    pygame.display.update()
pygame.quit()

代码可以缩短一点，但我认为你可以自己处理