当我移动它时，我的 pygame 角色会留下痕迹

Question

我一直在尝试用 Python 制作游戏，但是当我移动角色时，它会留下痕迹。我知道它没有显示那么多，但如果你靠近，你可以看到小径，这真的让我很困扰。

这是我的代码：

import pygame
import os
from pygame import mixer

pygame.init()
mixer.init()

width = 800
height = 600

black = (0,0,0)
white = (255,255,255)

ship_width = 56
ship_height = 64

disp = pygame.display.set_mode((width,height))

pygame.display.set_caption("space_game")

clock = pygame.time.Clock()

background = pygame.image.load(os.path.join("Backgrounds", "Space.png"))

Ship00 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship00.png"))
Ship01 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship01.png"))
Ship02 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship02.png"))
Ship03 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship03.png"))
Ship04 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship04.png"))
Ship05 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship05.png"))
Ship06 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship06.png"))
Ship07 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship07.png"))
Ship08 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship08.png"))
Ship09 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship09.png"))
Ship10 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship10.png"))
Ship11 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship11.png"))
Ship12 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship12.png"))
Ship13 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship13.png"))
Ship14 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship14.png"))
Ship15 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship15.png"))
Ship16 = pygame.image.load(os.path.join("Images", "Animations", "Ship 
Animation", "Ship16.png"))

images = [Ship00, Ship01, Ship02, Ship03, Ship04, Ship05, Ship06, Ship07, 
Ship08, Ship09, Ship10, Ship11, Ship12, Ship13, Ship14, Ship15, Ship16]

mixer.music.load(os.path.join("Music", "space_song.wav"))
mixer.music.play()

def gameLoop():
    x = (width * 0.45)
    y = (height * 0.8)

    x_ch = 0
    y_ch = 0

    x_bg = 0

    index = 0

    gameExit = False

    while not gameExit:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                gameExit = True

            if event.type == pygame.KEYDOWN:
                if event.key == ord("a"):
                    x_ch = -5

                elif event.key == ord("d"):
                    x_ch = 5

                elif event.key == ord("w"):
                    y_ch = -5

                elif event.key == ord("s"):
                    y_ch = 5

            if event.type == pygame.KEYUP:
                if event.key == ord("a") or event.key == ord("d"):
                    x_ch = 0

                if event.key == ord("w") or event.key == ord("s"):
                    y_ch = 0

        x += x_ch
        y += y_ch

        if x > width - ship_width or x < 0:
            x_ch = 0

        if y > height - ship_height or y < 0:
            y_ch = 0

        x_loop = x_bg % background.get_rect().height
        disp.blit(background, (0, x_loop - background.get_rect().height))

        if x_loop < height:
            disp.blit(background, (0, x_loop))

        x_bg += 5

        index += 1
        index %= len(images)
        current_image = images[index]
        disp.blit(current_image, (x,y))

        pygame.display.update()

        clock.tick(60)

gameLoop()
pygame.quit()
quit()

我怎样才能解决这个问题？（我知道轨迹几乎不可见，但我希望我的游戏很好）我有一个循环向下移动的背景，为什么轨迹不随之移动？

Answer 1

在翻转显示器之前，您需要对背景进行 blit。这将“擦除”轨迹。然后绘制当前图像并翻转显示。

    disp.blit(background, (0,0)) # or whatever location you need
    disp.blit(current_image, (x,y))
    pygame.display.flip()