我的“蛇”在试图以重复的方式移动它的时候卡在pygame中了？

Question

我已经写了一年的代码，现在只用python，我想通过制作我的第一个游戏来测试我的知识，所以我做了蛇。好的，现在我想让蛇向前移动，让玩家能够在不阻止它的情况下向某个方向移动它。但是我不知道我的代码出了什么问题。

import pygame
pygame.init()
running = True


x = 0
y = 0
momentum = "null"


def draw_rect(x, y, size, size1):
    pygame.draw.rect(screen, (204, 65, 242), (x, y, size, size1))

def momentum_forward(x, y):
    while momentum == "a":
        x += -25
    while momentum == "d":
        x += 25
    while momentum == "w":
        x += -25
    while momentum == "s":
        x += 25


while running:

    FPS = 30
    fpsClock = pygame.time.Clock()

    screen = pygame.display.set_mode((600, 480), 0, 32)
    draw_rect(x, y, 25, 25)


    momentum_forward(x, y)


    for event in pygame.event.get():
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_a:
                x += -25
                momentum = "a"
            if event.key == pygame.K_d:
                x += 25
                momentum = "d"
            if event.key == pygame.K_w:
                y += -25
                momentum = "w"
            if event.key == pygame.K_s:
                y += 25
                momentum = "s"


        if event.type == pygame.QUIT:
            running = False

    pygame.display.update()
    fpsClock.tick(FPS)

任何帮助都将不胜感激！！

Answer 1

你已经有了一个游戏循环。您不需要在momentum_forward中使用while循环

def momentum_forward(x, y):
    if momentum == "a":
        x += -25
    if momentum == "d":
        x += 25
    if momentum == "w":
        x += -25
    if momentum == "s":
        x += 25