Pygame似乎「避免」循環

Question

我剛剛開始使用Pygame，我正在嘗試一些基本的移動功能。

當我嘗試將我的移動條件編碼到我的對象類而不是遊戲循環中時遇到了問題。

我這工作的第一次嘗試如下：

classes.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 

main.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) 

我沒有工作第二次嘗試與DP ：

classes.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 

main.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) 

如此看來，代碼鬥爭去檢查從實例事件循環。我想將運動編碼爲一種方法而不是直接編碼的原因是爲了節省空間，並且稍後添加字符變得更加容易。

Answer 1

你的代碼有一個競爭條件（使用這個術語非常鬆散）。

您的角色沒有移動的原因是第一個pygame.event.get調用（當您檢查QUIT事件時）會佔用隊列上的所有KEYDOWN事件。然後（除非您在第一個循環運行時按下某個鍵），則當第一個GameObject檢查事件時，隊列中不會有KEYDOWN事件。 Diddo其他所有GameObjects。

你需要在一個循環中處理所有的pygame事件。示例代碼：

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.