为什么我的游戏的角色移动无法正常工作

Question

My character movement is bugging and i don't know why at all When i run it it moves forward and like bugs backwards Ive changed velocity and framerate to no avail and an scared to touch the code coz i just got it to work when the backgound is visible

import pygame
import os

WIDTH, HEIGHT = 1920, 1080
WIN = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("Gaem")
WHITE = (255, 255, 255)
FPS = 60
Vel = 5
CHARACTER = pygame.image.load('MAN.png')
def draw_window(CHARACTERM):
    WIN.fill((WHITE))
    WIN.blit(CHARACTER, (CHARACTERM.x, CHARACTERM.y))
    
    pygame.display.update()

def main():
    CHARACTERM = pygame.Rect(100, 300, 850, 450)

    clock = pygame.time.Clock()
    
    run = True
    while run:
        clock.tick(FPS)
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False


##########CHARACTER MOVMENT####################
        draw_window(CHARACTERM)
        keys_pressed = pygame.key.get_pressed()
        if keys_pressed[pygame.K_a]: #Left
            CHARACTERM.x -= Vel


        draw_window(CHARACTERM)
        keys_pressed = pygame.key.get_pressed()
        if keys_pressed[pygame.K_d]: #Right
            CHARACTERM.x += Vel


        draw_window(CHARACTERM)
        keys_pressed = pygame.key.get_pressed()
        if keys_pressed[pygame.K_w]: #Up
            CHARACTERM.y -= Vel


        draw_window(CHARACTERM)
        keys_pressed = pygame.key.get_pressed()
        if keys_pressed[pygame.K_s]: #Down
            CHARACTERM.y += Vel

################################################
        draw_window(CHARACTERM)
    pygame.quit()

if __name__ == "__main__":
    main()

Thank you Zatando1

Answer 1

It is sufficient to call pygame.key.get_pressed() and draw_window() once:

def main():
    CHARACTERM = pygame.Rect(100, 300, 850, 450)
    clock = pygame.time.Clock()
    
    run = True
    while run:
        clock.tick(FPS)
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False
        keys_pressed = pygame.key.get_pressed()
        if keys_pressed[pygame.K_a]: #Left
            CHARACTERM.x -= Vel
        if keys_pressed[pygame.K_d]: #Right
            CHARACTERM.x += Vel
        if keys_pressed[pygame.K_w]: #Up
            CHARACTERM.y -= Vel
        if keys_pressed[pygame.K_s]: #Down
            CHARACTERM.y += Vel

        draw_window(CHARACTERM)
    pygame.quit()

If you call draw_window() multiple times, pygame.display.update() will be executed multiple times in each frame. An update of the display at the end of the application loop is sufficient. Multiple calls to pygame.display.update() or pygame.display.flip() cause flickering.