import pygame

def update():
    pass

def draw():
    screen.fill((0, 0, 0))

    mouse_x, mouse_y = pygame.mouse.get_pos()

    eye_x = 200
    eye_y = 200

    distance_x = mouse_x - eye_x
    distance_y = mouse_y - eye_y

    screen.draw.filled_circle((eye_x, eye_y), 50, color=(255, 255, 255))
    screen.draw.filled_circle((200, 200), 15, color=(0, 0, 100))

    screen.draw.text(
        'distance x: ' + str(distance_x)
         + '\n' + 'distance y: ' + str(distance_y),
        (0, 0)
    )