python - Pygame好像是 "avoid"循环

Question

我刚刚开始使用 Pygame，目前正在尝试一些基本的移动功能。

我在尝试将我的移动条件编码到我的对象类而不是游戏循环中时遇到了问题。

我第一次成功的尝试如下:

类.py:

import pygame, sys
from pygame.locals import *
class GameObject:
    def __init__(self, image, height, speed):
        self.speed = speed
        self.image = image
        self.pos = image.get_rect().move(0, height) #initial placement

    def move_south(self):
        self.pos = self.pos.move(0, self.speed)
        if self.pos.right > 600:
            self.pos.left = 0

    def move_east(self):
        self.pos = self.pos.move(self.speed , 0)
        if self.pos.right > 600:
            self.pos.left = 0

主要.py:

import pygame, sys
from pygame.locals import *
from classes import *

screen = pygame.display.set_mode((640, 480))
#Importing Chars
player = pygame.image.load('green_hunter_small.png').convert()
#player.set_alpha(100) #makes whole player transparent
player.set_colorkey((0,0,0)) #sets background colour to transparent

ennemi =  pygame.image.load('red_hunter_small.png').convert()
ennemi.set_colorkey((0,0,0))

background = pygame.image.load('grass_map_640x640.png').convert()
screen.blit(background, (0, 0))
objects = []
objects.append(GameObject(player, 80, 0))
for x in range(2):      #create 2 objects
    o = GameObject(ennemi, x*40, 0)
    objects.append(o)
while True:
    for event in pygame.event.get(): #setting up quit
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
        if event.type == KEYDOWN:
            if event.key == K_DOWN:
                for o in objects:
                    screen.blit(background, o.pos, o.pos) #erases players by bliting bg 
                for o in objects:
                    o.speed = 4
                    o.move_south() #moves player
                    o.speed = 0
                    screen.blit(o.image, o.pos) #draws player
            if event.key == K_RIGHT:
                for o in objects:
                    screen.blit(background, o.pos, o.pos) #erases players by bliting bg 
                for o in objects:
                    o.speed = 4
                    o.move_east() #moves player
                    o.speed = 0
                    screen.blit(o.image, o.pos) #draws player                    
    pygame.display.update()
    pygame.time.delay(50)

我的第二次尝试 dp 失败了:

类.py:

import pygame, sys
from pygame.locals import *

class GameObject:
    def __init__(self, image, height, speed):
        self.speed = speed
        self.image = image
        self.pos = image.get_rect().move(0, height) #initial placement

    def move_south(self):
        self.pos = self.pos.move(0, self.speed)
        if self.pos.right > 600:
            self.pos.left = 0

    def move_east(self):
        self.pos = self.pos.move(self.speed , 0)
        if self.pos.right > 600:
            self.pos.left = 0

    def move(self):
        for event in pygame.event.get():
            if event.type == KEYDOWN:
                if event.key == K_DOWN:
                    screen.blit(background, self.pos, self.pos) #erases players by bliting bg 
                    self.speed = 4
                    self.move_south() #moves player
                    self.speed = 0
                if event.key == K_RIGHT:
                    screen.blit(background, self.pos, self.pos) #erases players by bliting bg 
                    self.speed = 4
                    self.move_east() #moves player
                    self.speed = 0
                screen.blit(self.image, self.pos) #draws player

主要.py:

import pygame, sys
from pygame.locals import *
from classes import *

screen = pygame.display.set_mode((640, 480))
#Importing Chars
player = pygame.image.load('green_hunter_small.png').convert()
#player.set_alpha(100) #makes whole player transparent
player.set_colorkey((0,0,0)) #sets background colour to transparent

ennemi =  pygame.image.load('red_hunter_small.png').convert()
ennemi.set_colorkey((0,0,0))

background = pygame.image.load('grass_map_640x640.png').convert()
screen.blit(background, (0, 0))
objects = []
objects.append(GameObject(player, 80, 0))
for x in range(2):      #create 2 objects
    o = GameObject(ennemi, x*40, 0)
    objects.append(o)
while True:
    for event in pygame.event.get(): #setting up quit
        if event.type == QUIT:
            pygame.quit()
            sys.exit()
    for o in objects:
        o.move()        
    pygame.display.update()
    pygame.time.delay(50)

所以看起来代码很难去检查实例的事件循环。我想将 Action 编码为一种方法而不是直接在 main 中进行编码的原因是为了节省空间并便于以后添加角色。

Answer 1

您的代码存在竞争条件(宽泛地使用该术语)。

你的角色没有移动的原因是第一个 pygame.event.get 调用(当你正在检查一个 QUIT 事件时)消耗了所有的 KEYDOWN 队列中的事件。然后(除非您在第一个循环运行时设法按下某个键)，当第一个 GameObject 检查事件时，队列中没有 KEYDOWN 事件。 Diddo 用于所有其他 GameObjects。

您需要在一个循环中处理所有 pygame 事件。示例代码:

class GameObject():
    #rest of class
    def move(self,event):
        if event.key == K_DOWN:
             screen.blit(background, self.pos, self.pos) #erases players by bliting bg 
             self.speed = 4
             self.move_south() #moves player
             self.speed = 0
        #repeat for all other directions
        screen.blit(self.image, self.pos) #draws player
#initialize objects
while True:
    for event in pygame.event.get():
         if event.type == QUIT: #handle quit event
         elif event.type == KEYDOWN:
            for o in objects:
                o.move(event)
    #do non-eventhandling tasks.