lib

function round(num, numDecimalPlaces)
    local mult = 10^(numDecimalPlaces or 0)
    num = num or 0
    return math.floor(num * mult + 0.5) / mult
end

function comma(number)

    local i, j, minus, int, fraction = tostring(number):find('([-]?)(%d+)([.]?%d*)')

    if number == nil or number == '' or int == nil then
        return 0.0
    end

    -- reverse the int-string and append a comma to all blocks of 3 digits
    int = int:reverse():gsub("(%d%d%d)", "%1,")

    -- reverse the int-string back remove an optional comma and put the
    -- optional minus and fractional part back
    return minus .. int:reverse():gsub("^,", "") .. fraction
end

function percentage(max,cur)
    return (cur/max)*100
end

function smooth(data, var, amount)
    local amount = amount or 1
    table.insert(data, var)

    if amount < 1 then amount = 1 end

    local dataLen = table.getn(data)
    while dataLen > amount do
        table.remove(data,1)
        dataLen = table.getn(data)
    end

    local sum = 0
    local i = 0
    for i=1, dataLen, 1 do
        sum = sum + data[i]
    end

    sum = (sum/dataLen)

    return sum
end

function math.clamp(x, min, max)
    if x < min then return min end
    if x > max then return max end
    return x
end