IMG_W, IMG_H = 320, 90
MSG = "\x4a\x6f\x79\x65\x75\x78\x20\x4e\x6f\x65\x6c\x20\x32\x30\x32\x32\x20\x54\x49\x2d\x50\x6c\x61\x6e\x65\x74\x20\x3d\x5e\x2e\x5e\x3d"

from ti_graphics import drawImage, setColor, fillRect, drawString, setPixel, getPixel
from ti_system import escape

SCR_W, SCR_H, SCR_Y0 = 320, 210, 30
FONT_W, FONT_H = 10, 15

def fill_rect(x, y, w, h, c):
  setColor(c)
  fillRect(x, y + SCR_Y0, w, h)

def draw_string(s, x, y, cf):
  setColor(cf)
  drawString(s, x, y + SCR_Y0)

def set_pixel(x, y, c):
  setPixel(x, y + SCR_Y0, c)

def get_pixel(x, y):
  return getPixel(x, y + SCR_Y0)


from random import randint
from math import cos

COLOR_BACK = (0, 12, 24)

fill_rect(0, 0, SCR_W, SCR_H, COLOR_BACK)
COLOR_BACK_GET = get_pixel(0, 0)
IMG_Y = SCR_H - IMG_H
drawImage("Noel2022", 0, SCR_Y0 + IMG_Y)
draw_string(MSG, (FONT_W and SCR_W - len(MSG)*FONT_W) // 2, (IMG_Y - FONT_H) // 2, (0, 11, 24))

liste_flocons = []

while(not escape()):
  for flocon in liste_flocons:
    x, y, seed, x_i = flocon[:4]
    oldx, oldy, oldx_i = x, y, x_i
    if y < SCR_H - 1:
      newy = y + 1
      x += cos(seed / 20) / 2
      tries = [(x, round(x)), (oldx, oldx_i)]
      for v in (x + 1, x - 1, oldx + 1, oldx - 1):
        v_i = round(v)
        if v_i >= 0 and v_i < SCR_W: tries.append((v, v_i))
      for lx in tries:
        x, x_i = lx
        if x_i < 0 or x_i >= SCR_W or get_pixel(x_i, newy) == COLOR_BACK_GET:
          y = newy
          break
    if y == oldy:
      liste_flocons.remove(flocon)
    else:
      if oldx_i >=0 and oldx_i < SCR_W: set_pixel(oldx_i, oldy, COLOR_BACK)
      if x_i >=0 and x_i < SCR_W: set_pixel(x_i, y, (255, 255, 255)) 
      flocon[:4] = x, y, seed + 1, x_i
  if not randint(0,3):
    x = randint(0, SCR_W - 1)
    liste_flocons.append([x, 0, randint(0, SCR_W), x])