python - pygame 对象不会移动

Question

我有一个非常简单的程序。我想要的是事物类中的项目能够自行移动。

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() 执行一次，但仅此而已，因此对象保留在同一个位置，仅移动了一次位置。我尝试将 block.move() 函数放入 for 和 while 循环中，但如果这样做，程序将不会运行。谁能告诉我如何修复我的代码，以便对象连续移动，以便它从屏幕的一端移动到屏幕的另一端？

Answer 1

您似乎在每个循环中初始化了您的 block 。尝试将 block = things(100,100,4) 移动到 while 循环之前。