pygame 不更新 x 和 y

Question

我尝试添加一个绿色方块（僵尸）跟随红色方块（玩家），但玩家位置更新而僵尸位置不会，我刚开始使用 python 但我没有不明白为什么会这样，先谢谢了。

import pygame

pygame.init()
window = pygame.display.set_mode((300, 300))
clock = pygame.time.Clock()

player = pygame.Rect(0, 0, 20, 20)
player.center = window.get_rect().center
playerVel = 3

zombie = pygame.Rect(0, 0, 20, 20)
zombieVel = 2

run = True
while run:
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
        if event.type == pygame.KEYDOWN:
            print(pygame.key.name(event.key))

    keys = pygame.key.get_pressed()
    
    player.x += (keys[pygame.K_RIGHT] - keys[pygame.K_LEFT]) * playerVel
    player.y += (keys[pygame.K_DOWN] - keys[pygame.K_UP]) * playerVel
        
    player.centerx = player.centerx % window.get_width()
    player.centery = player.centery % window.get_height()

    if zombie.x > player.x:
      zombie.x =- zombieVel

    if zombie.x < player.x:
      zombie.x =+ zombieVel

    if zombie.y > player.y:
      zombie.y =- zombieVel

    if zombie.y < player.y:
      zombie.y =+ zombieVel

    window.fill(0)
    pygame.draw.rect(window, (255, 0, 0), player)
    pygame.draw.rect(window, (0, 255, 0), zombie)
    pygame.display.flip()


#

pygame.quit()
exit()

Answer 1

if zombie.x > player.x:
      zombie.x =- zombieVel

    if zombie.x < player.x:
      zombie.x =+ zombieVel

    if zombie.y > player.y:
      zombie.y =- zombieVel

    if zombie.y < player.y:
      zombie.y =+ zombieVel

运算符应该是 += 和 -= 而不是 =+ =- 我认为

Answer 2

我发现了问题：

您刚刚添加僵尸速度时出错

这是可以正常工作的更新代码

import pygame

pygame.init()
window = pygame.display.set_mode((300, 300))
clock = pygame.time.Clock()

player = pygame.Rect(0, 0, 20, 20)
player.center = window.get_rect().center
playerVel = 3

zombie = pygame.Rect(0, 0, 20, 20)
zombieVel = 2

run = True
while run:
    clock.tick(60)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False
        if event.type == pygame.KEYDOWN:
            print(pygame.key.name(event.key))

    keys = pygame.key.get_pressed()

    player.x += (keys[pygame.K_RIGHT] - keys[pygame.K_LEFT]) * playerVel
    player.y += (keys[pygame.K_DOWN] - keys[pygame.K_UP]) * playerVel

    player.centerx = player.centerx % window.get_width()
    player.centery = player.centery % window.get_height()
    # changed those lines
    #################################################
    if zombie.x > player.x: zombie.x -= zombieVel 

    else: zombie.x += zombieVel

    if zombie.y > player.y: zombie.y -= zombieVel

    else: zombie.y += zombieVel
    #################################################    

    print(zombie.x, zombie.y)
    window.fill(0)
    pygame.draw.rect(window, (255, 0, 0), player)
    pygame.draw.rect(window, (0, 255, 0), zombie)
    pygame.display.flip()


# 

pygame.quit()
exit()

提示如果你想给一个变量添加一个值你可以这样做 var += 1 是 var = var +1.

的缩写形式

您的代码存在问题，您将加号或减号放在等号后面，而不是前面。就是这样一个简单的错误。这个错误导致你的 zombie.x 是这样计算的 zombie.x = 0 + zombieVel 同样适用于 y 值

pygame 不更新 x 和 y

pygame not updating x and y

python

pygame