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EMA50 signals
Source: https://fxcodebase.com/code/viewtopic.php?f=29&t=851
Forum: 29 · Topic 851 · 1 post(s)
EMA50 signals
Alexander.Gettinger · Mon Apr 26, 2010 9:57 pm
Signal based on indicator EMA50: viewtopic.php?f=17&t=626
Code: Select all `function Init() strategy:name(“EMA50 signal”); strategy:description(“”);
strategy.parameters:addGroup(“Parameters”);
strategy.parameters:addInteger(“EMA50_Period”, “Period of EMA50”, “”, 50);
strategy.parameters:addString(“Period”, “Timeframe”, “”, “m5”); strategy.parameters:setFlag(“Period”, core.FLAG_PERIODS);
strategy.parameters:addGroup(“Signals”); strategy.parameters:addBoolean(“ShowAlert”, “Show Alert”, “”, true); strategy.parameters:addBoolean(“PlaySound”, “Play Sound”, “”, false); strategy.parameters:addFile(“SoundFile”, “Sound File”, “”, “”); end
local SoundFile; local gSourceBid = nil; local gSourceAsk = nil; local first;
local BidFinished = false; local AskFinished = false; local LastBidCandle = nil;
local EMA50=nil;
function Prepare() local FastN, SlowN;
ShowAlert = instance.parameters.ShowAlert; if instance.parameters.PlaySound then SoundFile = instance.parameters.SoundFile; else SoundFile = nil; end assert(not(PlaySound) or (PlaySound and SoundFile ~= “”), “Sound file must be specified”); assert(instance.parameters.Period ~= “t1”, “Signal cannot be applied on ticks”);
ExtSetupSignal(“EMA50 signal:”, ShowAlert);
gSourceBid = core.host:execute(“getHistory”, 1, instance.bid:instrument(), instance.parameters.Period, 0, 0, true); gSourceAsk = core.host:execute(“getHistory”, 2, instance.bid:instrument(), instance.parameters.Period, 0, 0, false);
EMA50 = core.indicators:create(“EMA50”, gSourceBid.close, instance.parameters.EMA50_Period);
first = EMA50.DATA:first() + 2;
local name = profile:id() .. “(“ .. instance.bid:instrument() .. “(“ .. instance.parameters.Period .. “)” .. instance.parameters.EMA50_Period .. “)”; instance:name(name); end
local LastDirection=nil;
– when tick source is updated function Update() if not(BidFinished) or not(AskFinished) then return ; end
local period;
– update moving average EMA50:update(core.UpdateLast);
– calculate enter logic if LastBidCandle == nil or LastBidCandle ~= gSourceBid:serial(gSourceBid:size() - 1) then LastBidCandle = gSourceBid:serial(gSourceBid:size() - 1);
period = gSourceBid:size() - 1; if period > first then if EMA50.UP[period-2]==EMA50.DN[period-2] and EMA50.UP[period-1]<EMA50.DN[period-1] and LastDirection~=1 then ExtSignal(gSourceAsk, period, “Buy”, SoundFile); LastDirection=1; elseif EMA50.UP[period-2]==EMA50.DN[period-2] and EMA50.UP[period-1]>EMA50.DN[period-1] and LastDirection~=-1 then ExtSignal(gSourceBid, period, “Sell”, SoundFile); LastDirection=-1; end
end end end
function AsyncOperationFinished(cookie) if cookie == 1 then BidFinished = true; elseif cookie == 2 then AskFinished = true; end end
local gSignalBase = “”; – the base part of the signal message local gShowAlert = false; – the flag indicating whether the text alert must be shown
– Sets the base message for the signal – @param base The base message of the signals – ——————————————————— function ExtSetupSignal(base, showAlert) gSignalBase = base; gShowAlert = showAlert; return ; end
– Signals the message – @param message The rest of the message to be added to the signal – @param period The number of the period – @param sound The sound or nil to silent signal – ——————————————————— function ExtSignal(source, period, message, soundFile) if source:isBar() then source = source.close; end if gShowAlert then terminal:alertMessage(source:instrument(), source[period], gSignalBase .. message, source:date(period)); end if soundFile ~= nil then terminal:alertSound(soundFile, false); end end`