pygame物體不會移動

Question

我有一個非常簡單的程序。我想要的是物品類中的物品可以自行移動。

import pygame 
import time 
import random 
import threading 
#initilasies it 
pygame.init() 
#variables for height and width 
global display_width 
display_width= 800 
global display_height 
display_height= 600 

#declares colours uses RGB as reference 
white= (255,255,255) 
black = (0,0,0) 

#sets the dispaly (must be inside a tuple()) 
gameDisplay = pygame.display.set_mode((display_width,display_height)) 
#changes the name of the window 
pygame.display.set_caption("Robot Quest") 
#times stuff (is gonna be used for FPS) 
clock = pygame.time.Clock() 

#loads up an image (not shown) must be in same directory 
tankImg = pygame.image.load("tank.png") 
blockImg = pygame.image.load("block.png") 

class things: 
    def __init__(self,width,height,speed): 
     self.width = width 
     self.height = height 
     #if display.width doesn't work just pass the screen dimensions 
     self.X = display_width - self.width 
     self.Y= display_height - self.height 
     self.speed = speed 


    def move(self): 
     self.X -= self.speed 
     pos = self.X 
     return pos 

    def drawImage(self,imageName,x,y): 
     gameDisplay.blit(imageName,(x,y)) 

def game_loop(): 

    #game exit value is set 
    game_exit = False 

    #when true you exit the loop, logic goes here 
    while not game_exit: 

     for event in pygame.event.get(): 
      #method below on what to do if they press x in the corner 
      if event.type == pygame.QUIT: 
      #exit the loop 
       pygame.quit() 
       quit() 

     #fills the background 
     gameDisplay.fill(white) 

     block = things(100,100,4) 
     block.drawImage(blockImg,block.X,block.Y) 
     block.move() 

     pygame.display.update() 

     clock.tick(30) 

game_loop() 
pygame.quit() 
quit()  

在程序中，block.move（）只執行一次，但這就是全部，所以對象停留在同一個地方，只移動了一次。我試圖將block.move（）函數放在for和while循環中，但是如果我這樣做，程序將不會運行。任何人都可以告訴我如何修復我的代碼，使對象不斷移動，因此它從一端移動到另一端？

Answer 1

您似乎在每個循環中初始化您的塊。嘗試將block = things(100,100,4)移至while循環之前。

Answer 2

問題是，您正在重新初始化您的while循環內的塊，因此在每次迭代中，您都將其重置爲原始位置，然後移動它。嘗試移動while循環的外部初始化：

def game_loop(): 

    #game exit value is set 
    game_exit = False 

    block = things(100,100,4) 

    #when true you exit the loop, logic goes here 
    while not game_exit: 

     for event in pygame.event.get(): 
      #method below on what to do if they press x in the corner 
      if event.type == pygame.QUIT: 
      #exit the loop 
       pygame.quit() 
       quit() 

     #fills the background 
     gameDisplay.fill(white) 

     block.drawImage(blockImg,block.X,block.Y) 
     block.move() 

     pygame.display.update() 

     clock.tick(30)