Pygame 滚动背景相对于角色位置非常错误

如何解决Pygame 滚动背景相对于角色位置非常错误

我对编程和 pygame 都很陌生，这是我第一次尝试制作平台游戏。我遵循了关于如何制作滚动背景的 youtube 教程，并尝试将其实现到我自己的代码中。但它几乎没有运行，大多数时候字符会随机卡住，我不知道如何以及为什么。

这是错误的视频：https://youtu.be/sQK-Yeil4GE

这是全部代码

import pygame,os
#from pygame import Vector2

#Images
BG = pygame.image.load(os.path.join("assets\Background.png"))
BG2 = pygame.image.load(os.path.join("assets\F38196.jpg"))
idle_mario = pygame.image.load(os.path.join('assets\player_animations\Bigidle\Bigidle_0.png'))
mario_run_0 = pygame.image.load(os.path.join('assets\player_animations\Bigrun\Bigrun_0.png'))
mario_run_1 = pygame.image.load(os.path.join('assets\player_animations\Bigrun\Bigrun_1.png'))
mario_run_2 = pygame.image.load(os.path.join('assets\player_animations\Bigrun\Bigrun_2.png'))
mario_jump = pygame.image.load(os.path.join('assets\player_animations\Bigjump\Bigjump_0.png'))
bgWidth,bgHeight = BG2.get_rect().size

#Classes
class Character:
    def __init__(self):
        self.x = 200
        self.x2 = 960
        self.y = 810
        self.ground = 810
        self.vel = 0
        #Idle image
        self.mario_idle = pygame.transform.scale(idle_mario,(70,140))
        #Running animation:
        self.mario_run_0 = pygame.transform.scale(mario_run_0,140))
        self.mario_run_1 = pygame.transform.scale(mario_run_1,140))
        self.mario_run_2 = pygame.transform.scale(mario_run_2,140))
        self.mario_run_set = [self.mario_run_0,self.mario_run_0,self.mario_run_1,self.mario_run_2,self.mario_run_2]
        self.i = 0
        #Jumping image:
        self.mario_jump = pygame.transform.scale(mario_jump,140))

    def draw_character(self,idle,moving_right,moving_left,jumping):
        if jumping and moving_left is False:
            screen.blit(self.mario_jump,(self.x2,self.y))
        elif jumping and moving_left:
            screen.blit(pygame.transform.flip(self.mario_jump,True,False),self.y))
        elif idle:
            screen.blit(self.mario_idle,self.y))
        elif moving_right:
            screen.blit(self.mario_run_set[self.i],self.y))
            self.i += 1
            if self.i == 6:
                self.i = 0
        elif moving_left:
            screen.blit(pygame.transform.flip(self.mario_run_set[self.i],self.y))
            self.i += 1
            if self.i == 6:
                self.i = 0

class Stage:
    def __init__(self):
        self.width = bgWidth
        self.x = 0
        self.start_scroll = W / 2
        self.stop_scroll = self.width - self.start_scroll

class Main:
    def __init__(self):
        self.player = Character()
        self.stage = Stage()
        self.background = BG
        self.background2 = BG2
        self.bg_width = self.background2.get_rect().width
        self.ground = pygame.Rect(0,990,1920,20)
        self.move_right = False
        self.move_left = False
        self.idle = True
        self.is_jumping = False
        self.i = 1

    def draw(self):
        #pygame.draw.rect(screen,broWN,self.ground)
        self.player.draw_character(self.idle,self.move_right,self.move_left,self.is_jumping)

#Config
W = 1920
H = 1020
pygame.init()
screen = pygame.display.set_mode((W,H))
pygame.display.set_caption("Lidl Adventures")
clock = pygame.time.Clock()

#Constants
BLACK = (0,0)
WHITE = (255,255,255)
broWN = (137,94,39)
FPS = 60

#Functions

def main():
    true = True
    main = Main()
    while true:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                true = False
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_d:
                    main.move_right = True
                    main.move_left = False
                    main.idle = False
                    main.player.vel = 12
                if event.key == pygame.K_a:
                    main.move_left = True
                    main.move_right = False
                    main.idle = False
                    main.player.vel = -12
                if event.key == pygame.K_w or event.key == pygame.K_SPACE: #https://stackoverflow.com/questions/20940852/calculate-gravity-jump-in-pygame
                    main.is_jumping = True
            elif event.type == pygame.KEYUP:
                if event.key == pygame.K_d:
                    main.move_right = False
                    main.player.vel = 0
                if event.key == pygame.K_a:
                    main.move_left = False
                    main.player.vel = 0
                if main.move_left is False and main.move_right is False:
                    main.idle = True

        if main.is_jumping:
            v = 40-4*main.i
            main.player.y -= v
            main.i += 1
            if main.player.y == main.player.ground: #or main.player.y = main.player.object:
                main.is_jumping = False
                main.i = 1

        main.player.x += main.player.vel
        print(main.player.x)
        if main.player.x > main.stage.width - 70: main.player.x = main.stage.width - 70
        if main.player.x < 10: main.player.x = 10
        if main.player.x < main.stage.start_scroll: main.player.x2 = main.player.x
        elif main.player.x > main.stage.stop_scroll: main.stage.x2 = main.player.x - main.stage.width + W
        else:
            main.player.x2 = main.stage.start_scroll
            main.stage.x += -main.player.vel

        rel_x = main.stage.x % main.bg_width
        screen.blit(main.background2,(rel_x - main.bg_width,0))
        if rel_x < W:
            screen.blit(main.background2,(rel_x,0))

        main.draw()
        pygame.display.update()
        clock.tick(FPS)

if __name__ == "__main__":
    main()

这是滚动背景的部分

        if main.player.x > main.stage.width - 70: main.player.x = main.stage.width - 70
        if main.player.x < 10: main.player.x = 10
        if main.player.x < main.stage.start_scroll: main.player.x2 = main.player.x
        elif main.player.x > main.stage.stop_scroll: main.stage.x2 = main.player.x - main.stage.width + W
        else:
            main.player.x2 = main.stage.start_scroll
            main.stage.x += -main.player.vel

        rel_x = main.stage.x % main.bg_width
        screen.blit(main.background2,0))

我的问题： 什么可能导致角色随机卡住？ 还要澄清一下：当角色卡住时，通常是暂时的。

提前致谢！

解决方法

我自己弄明白了：我在 elif 语句中放置了 main.stage.x2 而不是 main.player.x2，以及在移动处理部分中缺少一些 if 语句。

这与前面的代码一起作为主函数：

def main():
    true = True
    main = Main()
    while true:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                true = False
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_d:
                    main.move_right = True
                    main.move_left = False
                    main.idle = False
                    main.player.vel = 12
                if event.key == pygame.K_a:
                    main.move_left = True
                    main.move_right = False
                    main.idle = False
                    main.player.vel = -12
                if event.key == pygame.K_w or event.key == pygame.K_SPACE:  # https://stackoverflow.com/questions/20940852/calculate-gravity-jump-in-pygame
                    main.is_jumping = True
            elif event.type == pygame.KEYUP:
                if event.key == pygame.K_d:
                    main.move_right = False
                    if main.move_left:
                        pass
                    else:
                        main.player.vel = 0
                if event.key == pygame.K_a:
                    main.move_left = False
                    if main.move_right:
                        pass
                    else:
                        main.player.vel = 0
        if main.move_left is False and main.move_right is False:
            main.idle = True
            main.player.vel = 0

        if main.is_jumping:
            v = 40 - 4 * main.i
            main.player.y -= v
            main.i += 1
            print(v)
            if main.player.y == main.player.ground:  # or main.player.y = main.player.object:
                main.is_jumping = False
                main.i = 1

        if main.move_right or main.move_left:
            main.player.x += main.player.vel
            print(main.player.x)

        if main.player.x > main.stage.width - 70: main.player.x = main.stage.width - 70
        if main.player.x < 10: main.player.x = 10
        if main.player.x < main.stage.start_scroll: main.player.x2 = main.player.x
        elif main.player.x > main.stage.stop_scroll: main.player.x2 = main.player.x - main.stage.width + W
        else:
            main.player.x2 = main.stage.start_scroll
            main.stage.x += -main.player.vel

        rel_x = main.stage.x % main.bg_width
        screen.blit(main.background,(rel_x - main.bg_width,0))
        if rel_x < W:
            screen.blit(main.background,(rel_x,0))

        main.draw()
        pygame.display.update()
        clock.tick(FPS)


if __name__ == "__main__":
    main()