import pygame
import sys

pygame.init()

clock = pygame.time.Clock()
screen = pygame.display.set_mode((800,800))
pygame.display.set_caption("Moving rectangle")

 
pos_x, pos_y = 400 , 660

jumping = False

y_gravity = 1
jump_height = 20 
y_velocity = jump_height


standing_surface = pygame.transform.scale(pygame.image.load("mario_stand_8bit.png"), (48, 64))
jumping_surface = pygame.transform.scale(pygame.image.load("mario_jump_8bit.png"), (48, 64))
background = pygame.image.load("menu_background_space.jpg")

player_rect = standing_surface.get_rect(center = (pos_x, pos_y))


while True: 
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
    
        keys_pressed = pygame.key.get_pressed()
            
    if keys_pressed[pygame.K_SPACE]:
        jumping = True

    screen.blit(background, (0, 0))

    if jumping:
        pos_y -= y_velocity
        y_velocity -= y_gravity
        if y_velocity < -jump_height:
            jumping = False
            y_velocity = jump_height
        player_rect = jumping_surface.get_rect(center=(pos_x, pos_y))
        screen.blit(jumping_surface, player_rect)
    else:
        player_rect = standing_surface.get_rect(center=(pos_x, pos_y))
        screen.blit(standing_surface, player_rect)

        pygame.display.update()
        pygame.display.flip()
        clock.tick(120)