如何在pygame中移动ASCII字符？

Question

我正在制作一款ASCII风格的流浪者游戏。我想用箭头打印@以表示玩家，并移动它。我尝试过的一切都无法实现。

import sys, pygame
pygame.init()
pygame.font.init()

white = (255, 255, 255) 
green = (0, 255, 0) 
blue = (0, 0, 128) 
black = (0, 0, 0)

playerposx = 356
playerposy = 254
playerpos = (playerposx, playerposy)
playervel = 16

win = pygame.display.set_mode((720,516))

pygame.display.flip()
pygame.display.set_caption('Tiles')
font = pygame.font.SysFont("timesnewroman", 16)
text = font.render('@', True, white, blue)
pygame.display.flip()


run = True
while run:
    pygame.time.delay(100)

    win.fill((0,0,0))
    win.blit(text, playerpos)
    pygame.display.update()

    keys = pygame.key.get_pressed()

    if keys[pygame.K_LEFT]:
        playerposx -= playervel
        print("LEFT")

    if keys[pygame.K_RIGHT]:
        playerposx += playervel
        print("RIGHT")

    if keys[pygame.K_UP]:
        playerposy -= playervel
        print("UP")

    if keys[pygame.K_DOWN]:
        playerposy += playervel
        print("DOWN")

    pygame.display.update()

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False


pygame.quit()

- Adam Barborík

Answer 1

你已经接近答案，但是你忘记更新 playerpos：

playerpos = (playerposx, playerposy)
win.blit(text, playerpos)

注意，当按下按钮时，playerposx和playerposy会发生改变，但playerpos从未被更新。

进一步注意，只需1次pygame.display.update()即可。移动被延迟，因为在调用pygame.key.get_pressed()之前调用了pygame.event.get()。由pygame.key.get_pressed()返回的状态是在事件被pygame.event.get()处理时进行评估的，因此您会得到上一帧的状态。

以某种方式更改主循环，如下所示：

run = True
while run:

    pygame.time.delay(100)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    keys = pygame.key.get_pressed()

    if keys[pygame.K_LEFT]:
        playerposx -= playervel
        print("LEFT")
    if keys[pygame.K_RIGHT]:
        playerposx += playervel
        print("RIGHT")
    if keys[pygame.K_UP]:
        playerposy -= playervel
        print("UP")
    if keys[pygame.K_DOWN]:
        playerposy += playervel
        print("DOWN")

    playerpos = (playerposx, playerposy)

    win.fill((0,0,0))
    win.blit(text, playerpos)
    pygame.display.update()

- Rabbid76