Pygame 的 key.set_repeat() 无法工作

Question

我正在尝试写一个简单的地图编辑器，但在使用pygame.set_repeat()时遇到了问题。我把它放在了循环之前设置，也试过在循环里面设置，但似乎都没有效果。

我查了其他的讨论，但没有找到能帮上忙的内容。有没有人能给点建议？

import pygame
import math
import sys
import os
import os.path

from pygame.locals import *
from classes.tile_sprites import sprites
from classes.tile_sprites import buttons

class MainCode:

    def main(self):
        size = width, height = 800, 600
        display = pygame.display.set_mode(size)
        fps_clock = pygame.time.Clock()

        button_location = "../resources/images/buttons"
        icon_location = "../resources/images/icons"

        surface_type = {"track":os.path.join(icon_location, "track.png"),
                         "dirt":os.path.join(icon_location, "dirt.png"),
                         "grass":os.path.join(icon_location, "grass")}

        incline_type = {"steep_incline":os.path.join(icon_location, "steep_incline.png"),
                        "moderate_incline":os.path.join(icon_location,"moderate_incline.png"),
                        "flat":os.path.join(icon_location, "flat.png"),
                        "moderate_decline":os.path.join(icon_location, "moderate_decline.png"),
                        "steep_decline":os.path.join(icon_location, "steep_decline.png")}

        surface_selections = ["track", "dirt", "grass"]
        incline_selections = ["steep_incline", "moderate_incline", "flat", "moderate_decline", "steed_decline"]

        tile_group = pygame.sprite.Group()
        button_group = pygame.sprite.Group()
        selected_group = pygame.sprite.GroupSingle()

        sbl = buttons((25, 25), (0, 255, 0), "left")
        sbl.rect.x, sbl.rect.y = 0, 0
        sbr = buttons((25, 25), (0, 255, 0), "right")
        sbr.rect.x, sbl.rect.y = 100, 0
        ibl = buttons((25, 25), (0, 255, 0), "left")
        ibl.rect.x, ibl.rect.y = 0, 100
        ibr = buttons((25, 25), (0, 255, 0), "right")
        ibr.rect.x, ibr.rect.y = 100, 100
        to_add = [sbl, sbr, ibl, ibr]
        button_group = self.pygame_group_add_many(to_add, button_group)

        pygame.key.set_repeat(1, 1000000000)

        while 1:
            for event in pygame.event.get():
                if event.type == QUIT:
                    pygame.quit()
                    sys.exit()
            mouse = pygame.mouse.get_pos()
            key = pygame.key.get_pressed()
            if key[K_DOWN]:
                print "down"

            display.fill((0, 0, 0))
            tile_group.draw(display)
            button_group.draw(display)
            pygame.display.flip()
            fps_clock.tick(30)

    def pygame_group_add_many(self, items_to_add, group):
        for each in items_to_add:
            group.add(each)
        return group

if __name__ == "__main__":
    MainCode().main()

Answer 1

get_pressed() 和 if key[K_DOWN]: 的意思是你一直按着 K_DOWN 键，没有松开它。get_pressed() 和 set_repeat() 没有关系。

set_repeat() 是用来处理事件的。

这段代码在你按住 K_DOWN 键的时候，只会打印一次 "event down"。

if event.type == KEYDOWN:
    if event.key == K_DOWN:
        print "event down"

如果你加上 set_repeat(1,1000)，那么在你按住 K_DOWN 键的时候，每隔 1000 毫秒就会打印一次 "event down"。

完整示例：

import pygame
from pygame.locals import *

pygame.init()

display = pygame.display.set_mode( (800,600) )

pygame.key.set_repeat(1,1000) # add/remove this line

running = True        
while running:

    for event in pygame.event.get():
        if event.type == KEYDOWN:
            if event.key == K_ESCAPE:
                running = False
            elif event.key == K_DOWN:
                print "EVENT DOWN"

pygame.quit()