from random import *

from polymatr import *
screen_w, screen_h, font_w, font_h, get_pixel, set_pixel, fill_rect, draw_string, show_screen, get_key = get_infos(("w","h","fwn","fh","gp","sp","fr","ds","sh","gk"))

def mat(n=42):
  seed(n)
  fill_rect(0, 0, screen_w, screen_h, (0,0,0))
  for l in range(screen_h//font_h): 
    draw_string(''.join(chr(48+randint(0,9)) for i in range(screen_w//font_w)), 0, font_h*l, (0,255,0), (0,0,0))
  show_screen()
  while not get_key():
    c = randint(0, screen_w-1)
    d = int(screen_h // 5.5)
    for l in range(screen_h):
      set_pixel(c, screen_h-1-l, l > screen_h-1-d and (0,0,0) or get_pixel(c, screen_h-1-d-l))
    show_screen()
    
mat()