screen saver kinda

--[[
        Cool looking login system.
        http://i46.tinypic.com/2yyoa3b.png
]]--
local logoB = {
    "ffffff000000000ffffff",
    "fff000bbbbbbbbb000fff",
    "ff0bbbbbbb0000bbbb0ff",
    "ff0bbb11110f00bbbb0ff",
    "f0bbbb1bbb0000bbbbb0f",
    "f0bbbbbb000000bbbbb0f",
    "0bbbbbbbc1c11cbbbbbb0",
    "0bbbbb000000000bbbbb0",
    "0bbbbb0000c0000bbbbb0",
    "0bbbbb000cec000bbbbb0",
    "0bbbbb00ceeec00bbbbb0",
    "f0bbbb000cec000bbbb0f",
    "f0bbbb0000c0000bbbb0f",
    "ff0bbbb0000000bbbb0ff",
    "ff0bbbbbbb0bbbbbbb0ff",
    "fff000bbbbbbbbb000fff",
    "ffffff000000000ffffff",
}
local logo = {
    "      000000000      ",
    "   000bbbbbbbbb000   ",
    "  0bbbbbbb0000bbbb0  ",
    "  0bbb11110f00bbbb0  ",
    " 0bbbb1bbb0000bbbbb0 ",
    " 0bbbbbb000000bbbbb0 ",
    "0bbbbbbbc1c11cbbbbbb0",
    "0bbbbb000000000bbbbb0",
    "0bbbbb0000c0000bbbbb0",
    "0bbbbb000cec000bbbbb0",
    "0bbbbb00ceeec00bbbbb0",
    " 0bbbb000cec000bbbb0 ",
    " 0bbbb0000c0000bbbb0 ",
    "  0bbbb0000000bbbb0  ",
    "  0bbbbbbb0bbbbbbb0  ",
    "   000000000000000   ", -- "   000bbbbbbbbb000   ",
    "      000000000      ",
}
local off = 5 -- + off
local words = {
    [8] = {[9] = "C",[11] = "I",[13] = "A"},
    [14] = {[8] = "C",[9] = "e",[10] = "n",[11] = "t",[12] = "r",[13] = "a",[14] = "l"},
    [16] = {[1 + off] = "I",[2+ off] = "n",[3+ off] = "t",[4+ off] = "e",[5+ off] = "l",[6+ off] = "l",[7+ off] = "i",[8+ off] = "g",[9+ off] = "e",[10+ off] = "n",[11+ off] = "c",[12+ off] = "e"}
}

local test = {"0123456789abcdef"}

local col = {
    ["0"] = 1,
    ["1"] = 2,
    ["2"] = 4,
    ["3"] = 8,
    ["4"] = 16,
    ["5"] = 32,
    ["6"] = 64,
    ["7"] = 128,
    ["8"] = 256,
    ["9"] = 512,
    ["a"] = 1024,
    ["b"] = 2048,
    ["c"] = 4096,
    ["d"] = 8192,
    ["e"] = 16384,
    ["f"] = 32768,
}

--[[
term.setBackgroundColor(colors.black)
term.clear()
]]--

local backGround = colors.lightBlue

local function draw(image,centerX,centerY,scale,invt)

    local img = image
    local offX = centerX - math.floor(#img[1]/2)*scale
    local offY = centerY - math.floor(#img/2) - 1
    local wdth = math.ceil(#img[1]*scale)

    for i = 1, #img do
        local line = img[i]
        if invt then
            line = string.reverse(line)
        end
        term.setCursorPos(offX,offY + i)
        for a = 1,wdth do
            local char = math.modf((a/scale)+0.5)
            local color = col[string.sub(line,char,char)]
            --if color then
                term.setBackgroundColor(color or backGround)
                term.write(words[i] and words[i][char] or " ")
            --end
        end
    end

end

-- test

local function clear()
    term.setBackgroundColor(backGround)
    term.setTextColor(colors.black)
    term.clear()
end

local invt = false
local rate = 0.1

while true do
    for i = 0,1,0.1 do
        clear()
        draw(logo,25,10,i,not invt)
        sleep(rate)
    end
    if invt then
        sleep(10)
    end
    for i = 1,0,-0.1 do
        clear()
        draw(logo,25,10,i,not invt)
        sleep(rate)
    end
    invt = not invt
    sleep(rate)
end

--[[
-- test example


local scale = 1
local inc = 0.1

while true do

    term.setBackgroundColor(colors.black)
    term.clear()
    draw(logo,25,10,scale,true)
    term.setBackgroundColor(colors.black)
    term.setCursorPos(1,1)
    term.write(tostring(scale).." "..tostring(inc))
    local event = {os.pullEvent()}

    if event[1] == "key" then
        if event[2] == 203 then -- left
            scale = scale - inc
        elseif event[2] == 205 then -- right
            scale = scale + inc
        elseif event[2] == 14 then
            return
        end
    end

end
]]--