游戏的背景在运动时会留下痕迹或痕迹

Question

所以我最近一直在尝试在游戏中实现滚动背景，但是当我向前移动时，游戏背景移到左侧会留下很大的痕迹，例如：

代码在下面：

#Game background
background = pg.transform.scale(pg.image.load('splash.jpg'), (WIDTH,HEIGHT))#background size being adjusted to fit a particular screen size
background_xpos = 0 #the x position of the background is at 0 of (0,0)
background_xpos2 = background.get_width() #obtains the width of the background at a certain coordinate 

def UpdateGame():    
    window.blit(background,(background_xpos,0))
    window.blit(background,(background_xpos,0))
    pg.display.update()

run = True  #while the game is running
while run:
    clock.tick(FPS) #determines the amount of frames per second
    background_xpos = background_xpos - 2
    background_xpos2 = background_xpos - 2

    if background_xpos < background.get_width() * -1:
        background_xpos = background.get_width()

    if background_xpos2 < background.get_width() * -1:
       background_xpos2 = background.get_width()

Answer 1

您必须先清除屏幕。

#Game background
background = pg.transform.scale(pg.image.load('splash.jpg'), (WIDTH,HEIGHT))#background size being adjusted to fit a particular screen size
background_xpos = 0 #the x position of the background is at 0 of (0,0)
background_xpos2 = background.get_width() #obtains the width of the background at a certain coordinate 

def UpdateGame():    
    window.blit(background,(background_xpos,0))
    window.blit(background,(background_xpos,0))
    pg.display.update()

run = True  #while the game is running
while run:
    screen.fill((0,0,0))
    clock.tick(FPS) #determines the amount of frames per second
    background_xpos = background_xpos - 2
    background_xpos2 = background_xpos - 2

    if background_xpos < background.get_width() * -1:
        background_xpos = background.get_width()

    if background_xpos2 < background.get_width() * -1:
       background_xpos2 = background.get_width()