无法在pygame上移动玩家

Question

我正在学习 pygame。我在移动时遇到了一点问题，我不知道 如何让玩家移动。我不明白我的错误在哪里。你能帮我解决这个问题吗。如果你给我一些关于 pygame 的建议，我会很感激。我是个新手

import pygame

widthSurface = 640
heightSurface = 480
keys = [False, False, False, False]
playerpos = [100, 100]
vel = 5

# images
player = pygame.image.load('resources/images/dude.png')
grass = pygame.image.load('resources/images/grass.png')
castle = pygame.image.load('resources/images/castle.png')


def blitGrassAndCastle():
    for x in range(widthSurface // grass.get_width() + 1):
        for y in range(heightSurface // grass.get_height() + 1):
            surface.blit(grass, (x * grass.get_width(), y * grass.get_height()))
    surface.blit(castle, (0, 30))
    surface.blit(castle, (0, 135))
    surface.blit(castle, (0, 240))
    surface.blit(castle, (0, 345))


if __name__ == '__main__':

    pygame.init()
    pressed = pygame.key.get_pressed()
    surface = pygame.display.set_mode((widthSurface, heightSurface))
    while True:
        pygame.time.delay(10)

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                exit(0)
                
        if pressed[pygame.K_LEFT]:
            playerpos[0] -= vel

        if pressed[pygame.K_RIGHT]:
            playerpos[0] += vel

        if pressed[pygame.K_UP]:
            playerpos[1] -= vel

        if pressed[pygame.K_DOWN]:
            playerpos[1] += vel

        blitGrassAndCastle()
        surface.blit(player, playerpos)

        pygame.display.update()

谢谢你！

Answer 1

pygame.key.get_pressed() 返回一个包含所有键盘按钮当前状态的列表。您需要在 ** 应用程序循环每一帧中获取键 ** 的状态，而不是在循环之前一次。你在循环之前得到的状态永远不会改变。

if __name__ == '__main__':

    pygame.init()

    # pressed = pygame.key.get_pressed() # <-- DELETE

    surface = pygame.display.set_mode((widthSurface, heightSurface))
    while True:
        pygame.time.delay(10)

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                exit(0)

        pressed = pygame.key.get_pressed() # <--- INSERT
                
        if pressed[pygame.K_LEFT]:
            playerpos[0] -= vel

        if pressed[pygame.K_RIGHT]:
            playerpos[0] += vel

        if pressed[pygame.K_UP]:
            playerpos[1] -= vel

        if pressed[pygame.K_DOWN]:
            playerpos[1] += vel

        blitGrassAndCastle()
        surface.blit(player, playerpos)

        pygame.display.update()