如何使精灵显示在pygame窗口上

Question

我正在尝试在pygame中创建一个简单的射击游戏，我是python和程序设计以及一般领域的新手，所以我可能已经跳过了一些重要的事情，我尝试了多次以找出不允许我进行渲染的内容精灵到窗口上。我需要弄清楚如何在屏幕上渲染精灵，并在按箭头键时重新渲染它们。

我已经查看过self.fill（），问题可能出在其他地方。我尝试更改RGB颜色。但是那没有用，所以我的代码很可能缺少重要的东西。但是，我无法缩小问题所在的位置，因此我包含了整个代码。

import pygame
import time
from sys import exit
import random

BLACK = (0, 0, 0)
YELLOW = (0, 200, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)
BLUE = (0, 0, 100)
PURPLE = (255, 0, 200)

# set up pygame display    
pygame.init()
screen_width = 500
screen = pygame.display.set_mode((500, screen_width))
pygame.display.set_caption('Trench Raid')
# classes

class Player(pygame.sprite.Sprite):
    ''' this class controls the player '''
    def __init__(self):
        super().__init__()
        self.image = pygame.Surface([10, 10])
        self.image.fill(YELLOW)
        self.rect = self.image.get_rect()

class Enemy(pygame.sprite.Sprite):
    ''' this class conrols enemies '''
    def __init__(self, color):
        super().__init__()

        self.image = pygame.Surface([10, 10])
        self.image.fill(color)
        self.rect = self.image.get_rect()
class Supporter(pygame.sprite.Sprite):
    ''' this class controls supporters'''
    def __init__(self, color):
        super().__init__()
        self.image = pygame.Surface([10, 1])
        self.image.fill(color)
        self.rect = self.image.get_rect()
class Projectile(pygame.sprite.Sprite):
    ''' this class conrols bullets '''
    def __init__(self):
        super().__init__()

        self.image = pygame.Surface([2, 5])
        self.image.fill(RED)
        self.rect = self.image.get_rect()


    playerSupporterFire = True


    def update(self):
          self.rect.y += 3

class FireLine(pygame.sprite.Sprite):
   ''' this class controls the fireLine'''
   def __init__(self):
        super().__init__()
        self.image = pygame.Surface([500, 1])
        self.image.fill(BLUE)
        self.rect = self.image.get_rect()

all_sprites_list = pygame.sprite.Group()
enemy_list = pygame.sprite.Group()
supporter_list = pygame.sprite.Group()
projectile_list = pygame.sprite.Group()
fireline_list = pygame.sprite.Group()

player_list = pygame.sprite.Group()

for i in range(20):
    enemy = Enemy(BLUE)
    enemy.rect.x = random.randrange(500)
    enemy.rect.y = random.randrange(300, 350)
    enemy_list.add(enemy)
    all_sprites_list.add(enemy)
for i in range(10):
    supporter = Supporter(PURPLE)
    supporter.rect.x = random.randrange(screen_width)
    supporter.rect.y = random.randrange(100, 200)
    supporter_list.add(supporter)
    all_sprites_list.add(supporter)
fireline = FireLine()
fireline_list.add(fireline)`enter code here`
all_sprites_list.add(fireline)
player = Player()
all_sprites_list.add(player)
x, y = 150, 353
MOVE_RIGHT = 1
MOVE_LEFT = 2
MOVE_UP = 1
MOVE_DOWN = 2
direction = 0

clock = pygame.time.Clock()
while True:

    for event in pygame.event.get():

        if event.type == pygame.QUIT:
            exit()

        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                direction = MOVE_LEFT
            elif event.key == pygame.K_RIGHT:
                direction = MOVE_RIGHT
            elif event.key == pygame.K_UP:
                direction = MOVE_UP
            elif event.type == pygame.K_DOWN:
                direction = MOVE_DOWN


            if event.key == pygame.K_SPACE:
                projectile = Projectile()
                projectile.rect.x = player.rect.x
                projectile.rect.y = player.rect.y
                all_sprites_list.add(projectile)
                projectile_list.add(projectile)

                #making enemies shooty shoot


        if event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT:
                direction = 0
            elif event.key == pygame.K_RIGHT:
                direction = 0
            elif event.type == pygame.K_UP:
                direction = 0
            elif event.type == pygame.K_DOWN:
                direction = 0
            if event.key ==  pygame.K_SPACE:
                pass


    if (direction == MOVE_LEFT):
        x-=0.05
    elif(direction == MOVE_RIGHT):
        x+=0.05
    elif(direction == MOVE_UP):
        y+=0.05
    elif(direction == MOVE_DOWN):
        y-=0.05
    all_sprites_list.update()
for projectile in projectile_list:
    enemy_hit_list = pygame.sprite.spritecollide(projectile, enemy_list, True)
    player_hit_list = pygame.sprite.spritecollide(projectile, enemy_list, True)
    for enemy in enemy_hit_list:
        projectile_list.remove(projectile)
        all_sprites_list.remove(projectile)
    for player in player_hit_list:
        projectile_list.remove(projectile)
        all_sprites_list.remove(projectile)
    if bullet.rect.y < -10:
        projectile_list.remove(projectile)
        all_sprites_list.remove(projectile)


    screen.fill((0, 0, 0))
    all_sprites_list.draw(screen)
    screen.blit(background, (0, 0))
    screen.blit(player, (x, y))
    pygame.display.update()
    pygame.display.flip()
    clock.tick(60)
    pygame.quit()