当我移动它时，我的 pygame 角色会留下痕迹 [英] My pygame character leaves trails when I move it

问题描述

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.我知道它并没有显示那么多，但如果你靠近你可以看到小径，这真的让我很困扰.

I've been trying to make a game in Python but when I move my character it leaves a trail behind. I know it doesn't show that much but if you get close you can see the trail and it really bothers me.

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()

我该如何解决这个问题?(我知道轨迹几乎是不可见的，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?

How can I fix this? (I know the trail is almost invisible but I want my game to be good) I have a background that is moving down in a loop why doesn't the trail move with it?

推荐答案

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.

Before you flip the display you need to blit the background. This will 'erase' the trail. Then draw the current image and flip the display.

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

这篇关于当我移动它时，我的 pygame 角色会留下痕迹的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！