Pygame显示黑屏

Question

我做了一些研究，看看我是否可以自己解决我的问题，但到目前为止还没有结果。 我已经检查过我是否过多地运行了 .display 命令，但我没有，程序将正常运行但屏幕显示为黑色，除非我关闭 window 时，您可以瞥见它应该是什么显示。 对出了什么问题有任何见解吗？ 非常感谢您的帮助！

import math
import random

import pygame
from pygame import mixer

# Initialize the pygame
pygame.init()

# create the screen
screen = pygame.display.set_mode((800, 600))

# Background
background = pygame.image.load('space background.png')

# Background Sound
# come back to this from bg music   'mixer.music.load('insert file name')'
# mixer.music.play(-1)

# Title and Icon
pygame.display.set_caption("Space Invaders")
icon = pygame.image.load('ufo.png')
pygame.display.set_icon(icon)

# Player
playerImg = pygame.image.load('ship.png')
playerX = 370
playerY = 480
playerX_change = 0

# Enemy
enemyImg = []
enemyX = []
enemyY = []
enemyX_change = []
enemyY_change = []
num_of_enemies = 6

for i in range(num_of_enemies):
    enemyImg.append(pygame.image.load('enemy.png'))
    enemyX.append(random.randint(0, 735))
    enemyY.append(random.randint(50, 150))
    enemyX_change.append(0.3)
    enemyY_change.append(40)

# Bullet

# Ready -  you cat see the bullet on the screen
# Fire - The bullet is currently moving

bulletImg = pygame.image.load('bullet.png')
bulletX = 0
bulletY = 480
bulletX_change = 0
bulletY_change = 1  # Bullet speed
bullet_state = "ready"

# Score

score_value = 0
font = pygame.font.Font('Minecraft.ttf', 24)
textX = 10
testY = 10  # might have to change back to 'text'

# Game Over text
over_font = pygame.font.Font('Minecraft.ttf', 64)


def show_score(x, y):
    score = font.render("Score : " + str(score_value), True, (225, 225, 255))
    screen.blit(score, (x, y))


def game_over_text(x, y):
    over_text = over_font.render("GAME OVER", True, (225, 225, 255))
    screen.blit(over_text, (200, 250))


def player(x, y):
    screen.blit(playerImg, (x, y))


def enemy(x, y, i):
    screen.blit(enemyImg[i], (x, y))


def fire_bullet(x, y):
    global bullet_state
    bullet_state = "fire"
    screen.blit(bulletImg, (x + 16, y + 10))


def iscollision(enemyX, enemyY, bulletX, bulletY):
    distance = math.sqrt(math.pow(enemyX - bulletX, 2)) + (math.pow(enemyY - bulletY, 2))
    if distance < 27:
        return True
    else:
        return False


# Game Loop
running = True
while running:

    # RGB
    screen.fill((0, 0, 0))
    # background image
    screen.blit(background, (0, 0))
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

        # if keystroke is pressed check whether its right or left
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                playerX_change = -0.7  # player speed
            if event.key == pygame.K_RIGHT:
                playerX_change = 0.7
            if event.key == pygame.K_SPACE:
                if bullet_state == "ready":
                    bullet_Sound = mixer.Sound('laser.wav')
                    bullet_Sound.play()
                    # Get the current X corrdinate of te spaceship
                    bulletX = playerX
                    fire_bullet(playerX, bulletY)

        if event.type == pygame.KEYUP:
            if event.key == pygame.K_LEFT or event.key == pygame.K_RIGHT:
                playerX_change = 0

    # 5 = 5 + -0.1 -> 5 = 5 - 0.1
    # 5 = 5 + 0.1

    # Checking for boundries of spaceship
    playerX += playerX_change
    if playerX <= 0:
        playerX = 0
    elif playerX >= 736:
        playerX = 736

    # Enemy Movement
    for i in range(num_of_enemies):

        # Game over
        if enemyY[i] > 440:
            for j in range(num_of_enemies):
                enemyY[j] = 2000
                game_over_text()
                break

        enemyX[i] += enemyX_change[i]
        if enemyX[i] <= 0:
            enemyX_change[i] = 0.3  # enemy speed
            enemyY[i] += enemyY_change[i]
        elif enemyX[i] >= 736:
            enemyX_change[i] = -0.3
            enemyY[i] += enemyY_change[i]

        # Collision
        collision = iscollision(enemyX[i], enemyY[i], bulletX, bulletY)
        if collision:
            explosion_Sound = mixer.Sound('explosion.wav')
            explosion_Sound.play()
            bulletY = 480
            bullet_state = "ready"
            score_value += 100
            enemyX[i] = random.randint(0, 736)
            enemyY[i] = random.randint(50, 150)

        enemy(enemyX[i], enemyY[i], i)

# Bullet Movement
if bulletY <= 0:
    bulletY = 480
    bullet_state = "ready"

if bullet_state == "fire":
    fire_bullet(bulletX, bulletY)
    bulletY -= bulletY_change

player(playerX, playerY)
show_score(textX, testY)
pygame.display.update()

Answer 1

您所要做的就是将最后一段代码（注释Bullet Movement下的 11 行）缩进一级。现在，它不在while循环下，这解释了为什么屏幕是黑色的以及为什么它只出现在你之后单击关闭按钮（退出循环并执行绘图代码）。 希望这可以帮助！