не появляется объект камень в моей игре очень прошу помочь
	
	
	
		
			
			
		Python:
	
	import pygame
import time
pygame.init()
display_width = 800
display_height = 600
display = pygame.display.set_mode((display_width, display_height))
pygame.display.set_caption("RUN!")
icon = pygame.image.load('icon.png')
pygame.display.set_icon(icon)
usr_width = 60
usr_height = 100
usr_x = display_width // 3
usr_y = display_height - usr_height - 100
rock_w = 20
rock_h = 70
rock_x = display_width - 50
rock_y = display_height - rock_h - 100
clock = pygame.time.Clock()
make_jump = False
jump_counter = 30
def gamerun():
    game = True
    global make_jump
    while game:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()
        keys = pygame.key.get_pressed()
        if keys[pygame.K_SPACE]:
            make_jump = True
        if make_jump:
            jump()
        time.sleep(0.01)
        display.fill((255, 255, 255))
        pygame.draw.rect(display, (41, 34, 61), (usr_x, usr_y, usr_width, usr_height))
        pygame.display.update()
    display.fill((255, 255, 255))
    rock_draw()
    pygame.draw.rect(display, (41, 34, 61), (usr_x, usr_y, usr_width, usr_height))
    pygame.display.update()
    clock.tick(60)
def jump():
    global usr_y, jump_counter, make_jump
    if jump_counter >= -30:
        usr_y -= jump_counter / 2
        jump_counter -= 1
    else:
        jump_counter = 30
        make_jump = False
def rock_draw():
    global rock_x, rock_y, rock_w, rock_h
    if rock_x >= -rock_w:
        pygame.draw.rect(display, (99, 108, 115), (rock_x, rock_y, rock_w, rock_h))
        rock_x -= 4
    else:
        rock_x = display_width - 50
gamerun()