OS Startup Gui

local mon = peripheral.wrap("top")
local monX, monY = mon.getSize()

local function drawASCI(pixels)
    local curX, curY = mon.getCursorPos()
    for i = 1, #pixels do
        local c = pixels:sub(i,i)
        if c == "x" then
            mon.setCursorPos((math.ceil((monX / 2) - (pixel:len / 2)) + (i-1)), curY+1)
            mon.setBackgroundColor(colors.white)
            mon.write(" ")
        end
    end
end

local function clear()
    mon.setBackgroundColor(colors.black)
    mon.clear()
    mon.setCursorPos(1,1)
end

clear()
drawASCI("    xxxxx    ")
drawASCI("  xx     xx  ")
drawASCI(" x         x ")
drawASCI("x           x")
drawASCI("x           x")
drawASCI("x  xxxxxxx  x")
drawASCI("x xxxxxxxxx x")
drawASCI("x           x")
drawASCI("x  xx   xx  x")
drawASCI("x x   x   x x")
drawASCI("x xxxx xxxx x")
drawASCI("x  xx   xx  x")
drawASCI(" x   xxx   x ")
drawASCI("  x       x  ")
drawASCI("   xx   xx   ")
drawASCI("     xxx     ")
drawASCI("                      ")
drawASCI("              xxxx xxx")
drawASCI("xxx xxx xxxxx x  x x  ")
drawASCI("x   x x x x x x  x xxx")
drawASCI("x   x   x x x x  x   x")
drawASCI("xxx xxx x x x xxxx xxx")