Рекурсивная заливка

local cmp = require("component")
local gpu = cmp.gpu
local event = require("event")
local serialization = require("serialization")
local unicode=require("unicode")
local filesystem = require("filesystem")
local shell = require("shell")
local term = require("term")
local uc=require('unicode')
local computer = require("computer")
local keyboard = require("keyboard")
a,b=gpu.getResolution()
local oldB=gpu.getBackground()
local oldF=gpu.getForeground()
local args={...}
local len = uc.len
local sub = uc.sub

function drawMem()
gpu.fill(1,1,10,1,' ')
gpu.set(1,1,tostring(computer.freeMemory()))
end
log = {}

function old()
 gpu.setBackground(oldB)
 gpu.setForeground(oldF)
end

function sq(x,y,w,h,col)
  gpu.setBackground(col)
  gpu.fill(x,y,w,h," ")
end

function req(x,y,back)
  find = false
  p = {gpu.get(x,y)}
  if p[3] == back then
    gpu.set(x,y,' ')
    find = true
  end
  drawMem()
  return find
end

function addLog(l)
  log[#log+1]=l
end

function check(back)
  ret = true
  if loc.x ~= a and req(loc.x+1,loc.y,back) == true then
    addLog('x+1')
    loc.x=loc.x+1
  elseif loc.x ~= 1 and req(loc.x-1,loc.y,back) == true then
    addLog('x-1')
    loc.x=loc.x-1
  elseif loc.y ~= b and req(loc.x,loc.y+1,back) == true then
    addLog('y+1')
    loc.y=loc.y+1
  elseif loc.y ~= 1 and req(loc.x,loc.y-1,back) == true then
    addLog('y-1')
    loc.y=loc.y-1
  else
    h = log[#log]
    if #log < 1 then
      ret = false
    elseif h == 'x-1' then
      loc.x=loc.x+1
      table.remove(log)
    elseif h == 'x+1' then
      loc.x=loc.x-1
      table.remove(log)
    elseif h == 'y-1' then
      loc.y=loc.y+1
      table.remove(log)
    elseif h == 'y+1' then
      loc.y=loc.y-1
      table.remove(log)
    end
  end
  return ret
end


function kost()
  u =  gpu.getBackground()
  u1 =  gpu.getForeground()
  o ={ gpu.get(1,1)}
  gpu.set(1,1,' ')
  k = {gpu.get(1,1)}
  true_color = k[3]
  gpu.setBackground(o[3])
  gpu.setForeground(o[2])
  gpu.set(1,1,o[1])
  gpu.setBackground(u)
  gpu.setForeground(u1)
end

shell.execute('draw pic.pic')

gpu.setBackground(0x00FF00)
kost()

while true do
 -- gpu.setBackground(math.random(0x222222,0xFFFFFF))
  --e = {event.pull("touch")}
  e= {0,0,math.random(1,a),math.random(1,b)}
  t = {gpu.get(e[3],e[4])}
  loc={x=e[3],y=e[4]}
  log = {}
  g = gpu.getBackground()
  if t[3] ~= true_color then
    while true do
      if check(t[3]) and g ~= t[3] then

      else
        break
      end
    end
  end
end