名称错误：未定义名称“speed”

Question

你好，我对pygame有点陌生，我写了以下代码：

import sys, pygame

pygame.init()
screen = pygame.display.set_mode((800, 368))
background = pygame.image.load("background.png")
background.convert()
screen.blit(background, (0, 0))

ball = pygame.image.load("ball.bmp")
ballrect = ball.get_rect()
player1 = pygame.image.load("player1.png")
player1rect = player1.get_rect()

while 1:
    for event in pygame.event.get():
        if event.type == pygame.QUIT: 
            sys.exit()              

    ballrect = ballrect.move(speed)
    if ballrect.left < 0 or ballrect.right > width:
        speed[0] = -speed[0]
    if ballrect.top < 0 or ballrect.bottom > height:
        speed[1] = -speed[1]

    screen.blit(ball, ballrect)
    screen.blit(player1, player1rect)
    pygame.display.update()

但当我打开它的时候，上面写着

^{pr2}$

请帮帮我，我需要它。我自己解决不了这个问题。在

Answer 1

您没有定义某些变量：speed，width，height。在

将以下代码放在while循环之前的某个位置：

speed = [1, 1]
width = 800
height = 368