如何在Pygame Zero中制作全向子弹

import pgzrun
from math import atan2, degrees, pi

player = Actor("player")
player.pos = 400, 300
player.angle = 0
player.speed = 5

def update_player():
    if keyboard.left:
        player.angle -= 5
    if keyboard.right:
        player.angle += 5
    if keyboard.up:
        player.x += player.speed * cos(radians(player.angle))
        player.y -= player.speed * sin(radians(player.angle))
    if keyboard.space:
        create_bullet(player.x, player.y, player.angle)

bullets = []

def create_bullet(x, y, angle):
    bullet = Actor("bullet")
    bullet.pos = x, y
    bullet.angle = angle
    bullet.speed = 10
    bullets.append(bullet)

def update_bullets():
    for bullet in bullets:
        bullet.x += bullet.speed * cos(radians(bullet.angle))
        bullet.y -= bullet.speed * sin(radians(bullet.angle))
        if bullet.x < 0 or bullet.x > 800 or bullet.y < 0 or bullet.y > 600:
            bullets.remove(bullet)

def draw_bullets():
    for bullet in bullets:
        bullet.draw()

def update():
    update_player()
    update_bullets()

def draw():
    screen.clear()
    player.draw()
    draw_bullets()

pgzrun.go()