signToDir

stdTable = {4, 2, 1, 3}

function getSign(number)
    return (number > 0 and 1) or (number == 0 and 0) or -1
end

function toDirX(sign)
    if sign > 0 then
        return stdTable[1]
    else
        return stdTable[2]
    end
end

function toDirY(sign)
    if sign > 0 then
        return stdTable[3]
    else
        return stdTable[4]
    end
end