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Settings = {
Name = "*Volume Moving Average",
round = "off",
Period = 10, 
Metod = "EMA", --SMA, EMA, WMA, SMMA
line = {{
      Name = "Volume MA",
      Type = TYPE_LINE, 
      Color = RGB(255, 0, 0)
      }
      }
}

function Init() 
   func = vMA()
   return #Settings.line
end

function OnCalculate(Index) 
   return func(Index, Settings)
end

function vMA()
local t_SMA = F_SMA()
local t_EMA = F_EMA()
local t_WMA = F_WMA()
local t_SMMA = F_SMMA()
return function(I, Fsettings, ds)
   local Out = nil
   local Fsettings=(Fsettings or {})
   local P = (tonumber(Fsettings.Period) or 4)
   local M = (Fsettings.Metod or "SMA")
   local VT = "Volume"
   local R = (Fsettings.round or "off")
   if M == "SMA" then
      Out = t_SMA(I, P, VT, ds, R)
   elseif M == "EMA" then
      Out = t_EMA(I, P, VT, ds, R)
   elseif M == "WMA" then
      Out = t_WMA(I, P, VT, ds, R)
   elseif M == "SMMA" then
      Out = t_SMMA(I, P, VT, ds, R)
   else
      Out = nil
   end
   return rounding(Out, R)
end
end
------------------------------------------------------------------
--Moving Average SMA, EMA, WMA, SMMA
------------------------------------------------------------------
--[[Simple Moving Average (SMA)
SMA = sum(Pi) / n
]]
function F_SMA()
local SMA_TMP={}
return function (I, Period, VType, ds, round) 
local Out = nil
   if I == 1 then
      SMA_TMP={}
   end
   if I >= Period then
      local sum = 0
      for i = I-Period+1, I do
         sum = sum +Value(i, VType, ds)
      end
      SMA_TMP[I] = sum/Period
      if I > Period then Out = SMA_TMP[I-1] end
   end   
   return rounding(Out,round)
end
end

--[[Exponential Moving Average (EMA)
EMAi = (EMAi-1*(n-1)+2*Pi) / (n+1)
]]
function F_EMA() 
local EMA_TMP={}
return function(I, Period, VType, ds, round)
local Out = nil
   if I == 1 then
      EMA_TMP={}
      EMA_TMP[I]=rounding(Value(I, VType, ds),round)
   else
      EMA_TMP[I]=rounding((EMA_TMP[I-1]*(Period-1)+2*Value(I, VType, ds)) / (Period+1),round)
   end
   if I > Period then
      Out = EMA_TMP[I-1]
   end
   return rounding(Out,round)
end
end

--[[
William Moving Average (WMA)
( Previous WILLMA * ( Period - 1 ) + Data ) / Period
]]
function F_WMA()
local WMA_TMP={}
return function(I, Period, VType, ds, round)
local Out = nil
   if I == 1 then
      WMA_TMP={}
      WMA_TMP[I]=rounding(Value(I, VType, ds),round)
   else
      WMA_TMP[I]=rounding((WMA_TMP[I-1]*(Period-1)+Value(I, VType, ds)) / Period,round)
   end
   if I > Period then
      Out = WMA_TMP[I-1]
   end
   return rounding(Out,round)
end
end

--[[Smoothed Moving Average (SMMA)
SMMAi = (sum(Pi) - SMMAi-1 + Pi) / n
]]
function F_SMMA()
local SMMA_TMP={}
return function(I, Period, VType, ds, round)
local Out = nil
   if I == 1 then
      SMMA_TMP={}
   end
   if I >= Period then
      local sum = 0
      for i = I-Period+1, I do
         sum = sum +Value(i, VType, ds)
      end
      if I == Period then         
         SMMA_TMP[I]=rounding((sum-Value(I, VType, ds)+Value(I, VType, ds)) / Period, round)
      else
         SMMA_TMP[I]=rounding((sum-SMMA_TMP[I-1]+Value(I, VType, ds)) / Period, round)
      end
      if I > Period then Out = SMMA_TMP[I-1] end
   end
   return rounding(Out,round)
end
end

function rounding(num, round) 
if round and string.upper(round)== "ON" then round=0 end
if num and tonumber(round) then
   local mult = 10^round
   if num >= 0 then return math.floor(num * mult + 0.5) / mult
   else return math.ceil(num * mult - 0.5) / mult end
else return num end
end

function Value(I,VType,ds) 
local Out = nil
VType=(VType and string.upper(string.sub(VType,1,1))) or "A"
   if VType == "O" then      --Open
      Out = (O and O(I)) or (ds and ds:O(I))
   elseif VType == "H" then    --High
      Out = (H and H(I)) or (ds and ds:H(I))
   elseif VType == "L" then   --Low
      Out = (L and L(I)) or (ds and ds:L(I))
   elseif VType == "C" then   --Close
      Out = (C and C(I)) or (ds and ds:C(I))
   elseif VType == "V" then   --Volume
      Out = (V and V(I)) or (ds and ds:V(I)) 
   elseif VType == "M" then   --Median
      Out = ((Value(I,"H",ds) + Value(I,"L",ds)) / 2)
   elseif VType == "T" then   --Typical
      Out = ((Value(I,"M",ds) * 2 + Value(I,"C",ds))/3)
   elseif VType == "W" then   --Weighted
      Out = ((Value(I,"T",ds) * 3 + Value(I,"O",ds))/4) 
   elseif VType == "D" then   --Difference
      Out = (Value(I,"H",ds) - Value(I,"L",ds))
   elseif VType == "A" then   --Any
      if ds then Out = ds[I] else Out = nil end
   end
return Out
end