---------------------------------------------- < / h1>
`#Start Main Game Loop game_running = True #Game Loop while game_running: for event in pygame.event.get(): #Exit loop on quit if event.type == QUIT: game_running = False if randint(1, SPAWN_RATE) == 1: VampireSprite() for vampire in all_vampires: vampire.update(GAME_WINDOW) display.update() pygame.quit()`

Question

无法弄清楚为什么我的代码在运行时不显示精灵。该代码来自我在图书馆找到的一本操作指南书，我已经多次重读了该代码，没有发现与该书说的有所不同的内容。这是我第一次在python上进行编码，但是我还没有任何东西可以帮助我解决问题。到目前为止，这就是我为游戏编写的所有代码。

import pygame
from pygame import *
from random import randint

pygame.init()
WINDOW_WIDTH = 1100
WINDOW_HEIGHT = 600
WINDOW_RES = (WINDOW_WIDTH, WINDOW_HEIGHT)

WIDTH = 100
HEIGHT = 100

WHITE = (255, 255, 255)

SPAWN_RATE = 360

GAME_WINDOW = display.set_mode(WINDOW_RES)
display.set_caption('Attack of the vampire Pizzas!')

pizza_img = image.load('vampire.png')
pizza_surf = Surface.convert_alpha(pizza_img)
VAMPIRE_PIZZA = transform.scale(pizza_surf, (WIDTH, HEIGHT))

background_img = image.load('restaurant.jpg')
background_surf = Surface.convert_alpha(background_img)
BACKGROUND = transform.scale(background_surf, WINDOW_RES)


class VampireSprite(sprite.Sprite):

    def __init__(self):
        super().__init__()
        self.speed = 2
        self.lane = randint(0, 4)
        all_vampires.add(self)
        self.image = VAMPIRE_PIZZA.copy()
        y = 50 + self.lane * 100
        self.rect = self.image.get_rect(center = (1100, y))


    def update(self, game_window):
        game_window.blit(self.image, (self.rect.x, self.rect.y))


        all_vampires = sprite.Group()
        tile_color = WHITE
        for row in range(6):
           for column in range(11):
               draw.rect(BACKGROUND, tile_color, (WIDTH * column, HEIGHT * row, WIDTH, HEIGHT), 1)

        GAME_WINDOW.blit(BACKGROUND, (0,0))

---------------------------------------------- < / h1>

#Start Main Game Loop
game_running = True
#Game Loop
while game_running:

    for event in pygame.event.get():

        #Exit loop on quit
        if event.type == QUIT:
            game_running = False

   if randint(1, SPAWN_RATE) == 1:
       VampireSprite()

   for vampire in all_vampires:
       vampire.update(GAME_WINDOW)

   display.update()

pygame.quit()

Answer 1

该代码似乎具有所有正确的组成部分，只是有点混乱。

通常，制作精灵时，它具有__init__()函数（显然用于初始化），另外还具有update()函数。 update()函数通常不将对象绘制到显示/表面，而是调整位置（即sprite.rect）或更改用于sprite的“外观”（图像），以绘制稍后。

子画面通常分为适当命名的Sprite Group。一旦将精灵放置在一个组中，对 group .update（）的一次调用将在包含的每个精灵上调用update()函数。真的很方便，而且效果很好。

因此调整您的吸血鬼披萨精灵：

class VampireSprite(sprite.Sprite):

    def __init__(self):
        super().__init__()
        self.speed = 2
        self.lane = randint(0, 4)
        self.image = VAMPIRE_PIZZA.copy()
        y = 50 + self.lane * 100
        self.rect = self.image.get_rect(center = (1100, y))

    def update(self):
        # TODO - do Vampire Pizzas Move?
        #     if so, update the self.rect
        pass

仅此而已。我删除了绘画代码，这将由Sprite组处理。

所以稍后：

# Make a group of vampire sprites
all_vampires = sprite.Group()
all_vampires.add( VampireSprite() )   # Start with a single vampire

# Game Loop
game_running = True
while game_running:

    # handle events
    for event in pygame.event.get():
        #Exit loop on quit
        if event.type == QUIT:
            game_running = False

    # spawn some vampires, maybe
    if randint(1, SPAWN_RATE) == 1:
       all_vampires.add( VampireSprite() ) # add to the group

    # Update/move all vampire sprites
    all_vampires.update()                  # updates every sprite in group

    # repaint the screen
    GAME_WINDOW.blit(BACKGROUND, (0,0))
    # draw some columns(?)
    tile_color = WHITE
    for row in range(6):
       for column in range(11):
           draw.rect(GAME_WINDOW, tile_color, (WIDTH * column, HEIGHT * row, WIDTH, HEIGHT), 1)

    all_vampires.draw()                    # paints every sprite in group

    display.update()

pygame.quit()

all_vampires子画面组有两个电话-all_vampires.update()和all_vampires.draw()？仅通过这两个调用，组中的所有子画面都将被移动（调整/无论如何）并绘制到屏幕上。

精灵不会显示

1 个答案: