-- More information about this indicator can be found at:
-- http://fxcodebase.com/code/viewtopic.php?f=17&t=10688

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function Init()
    indicator:name("XdinMA indicator");
    indicator:description("XdinMA indicator");
    indicator:requiredSource(core.Tick);
    indicator:type(core.Indicator);

    indicator.parameters:addGroup("Calculation");
    indicator.parameters:addInteger("MainPeriod", "MainPeriod", "", 10);
    indicator.parameters:addInteger("PlusPeriod", "PlusPeriod", "", 20);
    indicator.parameters:addString("Method", "Method", "", "MVA");
    indicator.parameters:addStringAlternative("Method", "MVA", "", "MVA");
    indicator.parameters:addStringAlternative("Method", "EMA", "", "EMA");
    indicator.parameters:addStringAlternative("Method", "KAMA", "", "KAMA");
    indicator.parameters:addStringAlternative("Method", "Wilder", "", "Wilder");
    indicator.parameters:addStringAlternative("Method", "LWMA", "", "LWMA");
    indicator.parameters:addStringAlternative("Method", "SineWMA", "", "SineWMA");
    indicator.parameters:addStringAlternative("Method", "TriMA", "", "TriMA");
    indicator.parameters:addStringAlternative("Method", "LSMA", "", "LSMA");
    indicator.parameters:addStringAlternative("Method", "SMMA", "", "SMMA");
    indicator.parameters:addStringAlternative("Method", "HMA", "", "HMA");
    indicator.parameters:addStringAlternative("Method", "ZeroLagEMA", "", "ZeroLagEMA");
    indicator.parameters:addStringAlternative("Method", "DEMA", "", "DEMA");
    indicator.parameters:addStringAlternative("Method", "T3", "", "T3");
    indicator.parameters:addStringAlternative("Method", "ITrend", "", "ITrend");
    indicator.parameters:addStringAlternative("Method", "Median", "", "Median");
    indicator.parameters:addStringAlternative("Method", "GeoMean", "", "GeoMean");
    indicator.parameters:addStringAlternative("Method", "REMA", "", "REMA");
    indicator.parameters:addStringAlternative("Method", "ILRS", "", "ILRS");
    indicator.parameters:addStringAlternative("Method", "IE/2", "", "IE/2");
    indicator.parameters:addStringAlternative("Method", "TriMAgen", "", "TriMAgen");
    indicator.parameters:addStringAlternative("Method", "JSmooth", "", "JSmooth");
    indicator.parameters:addDouble("K", "K", "", 2);

    indicator.parameters:addGroup("Style");
    indicator.parameters:addColor("clr", "Color", "Color", core.rgb(255, 255, 0));
    indicator.parameters:addInteger("widthLinReg", "Line width", "Line width", 1, 1, 5);
    indicator.parameters:addInteger("styleLinReg", "Line style", "Line style", core.LINE_SOLID);
    indicator.parameters:setFlag("styleLinReg", core.FLAG_LINE_STYLE);
end

local first;
local source = nil;
local MainPeriod;
local PlusPeriod;
local Method;
local K;
local MA_Main;
local MA_Plus;
local XdinMA=nil;

function Prepare(nameOnly)
    source = instance.source;
    MainPeriod=instance.parameters.MainPeriod;
    PlusPeriod=instance.parameters.PlusPeriod;
    Method=instance.parameters.Method;
    K=instance.parameters.K;
 
	assert(core.indicators:findIndicator("AVERAGES") ~= nil, "Please, download and install AVERAGES.LUA indicator");    
    local name = profile:id() .. "(" .. source:name() .. ", " .. instance.parameters.MainPeriod .. ", " .. instance.parameters.PlusPeriod .. ", " .. instance.parameters.Method .. ")";
    instance:name(name);
    if nameOnly then
        return;
    end
    MA_Main = core.indicators:create("AVERAGES", source, Method, MainPeriod, false);
    MA_Plus = core.indicators:create("AVERAGES", source, Method, PlusPeriod, false);

    first = math.max(MA_Main.DATA:first(),MA_Plus.DATA:first());
    XdinMA = instance:addStream("XdinMA", core.Line, name .. ".XdinMA", "XdinMA", instance.parameters.clr, first);
    XdinMA:setWidth(instance.parameters.widthLinReg);
    XdinMA:setStyle(instance.parameters.styleLinReg);
end

function Update(period, mode)
   if (period>first) then
    MA_Main:update(mode);
    MA_Plus:update(mode);
    XdinMA[period]=K*MA_Main.DATA[period]-(K-1)*MA_Plus.DATA[period];
   end 
end