scanner.lua

Filter = "allthemodium"
Scanner = peripheral.wrap("back")
Cswitch = 12
local function len(x , y)
    return math.sqrt(math.pow(x, 2) + math.pow(y, 2))
end

local function pow(b)
    return math.pow(b["x"], 2) + math.pow(b["y"], 2) + math.pow(b["z"],2)
end

local function lenb(b)
    local v = vector.new(b["x"], b["y"], b["z"])
    return v:length()
end

local function rot(x,y, a)
    local xr =  math.cos(a) * x + math.sin(a) * y
    local yr =  -math.sin(a) * x + math.cos(a) * y
    return xr , yr
end

local function norm(x,y)
    local len = len(x,y)
    return x / len, y / len
end

local function div(x,y , amount)
    return x / amount, y / amount
end

local function mul(x, y, amount)
    return x * amount, y * amount
end

local function middle()
    local width, height = term.getSize()
    return width / 2, height / 2
end

local function compass(x, y)
    local ox, oy = middle()
    local dis = len(x,y)
    if dis < Cswitch then
        print("normal")
        paintutils.drawPixel(ox , oy, colors.white)
        paintutils.drawPixel(ox + x, oy + y, colors.green)
    else
        print("zoomed out")
        paintutils.drawPixel(ox , oy, colors.white)
        local sx, sy = div(x,y,dis)
        local sx, sy = mul(sx,sy,5)
        paintutils.drawPixel(ox + sx, oy + sy, colors.red)
    end
    term.setBackgroundColor(colors.black)
end


local function findClose()
    local minb = nil
    local minlen = math.huge
    for id, block in pairs(Blocks) do
        if string.match(block["name"], Filter) then
           local len =  pow(block)
           if len < minlen then
                minlen = len
                minb = block
           end
        end
    end
    return minb
end

while true do
    term.clear()
    term.setCursorPos(1, 1)
    term.setBackgroundColor(colors.black)
    Blocks, Err = Scanner.scan(16)
    Found = false
    local block = findClose()
    if block ~= nil then
        term.setTextColor(colors.green)
        term.write(block["name"])
        term.setTextColor(colors.white)
        term.write(" at ")
        term.setTextColor(colors.blue)
        print(string.format("x:%d z:%d y:%d", block["x"], block["z"], block["y"]))
        compass(block["x"], block["z"])
    else
        print(os.clock())
        print("Nothing found")
    end
    sleep(5)
end