-- More information about this indicator can be found at: -- http://fxcodebase.com/code/viewtopic.php?f=17&t=20 --+------------------------------------------------------------------+ --| Copyright © 2018, Gehtsoft USA LLC | --| http://fxcodebase.com | --+------------------------------------------------------------------+ --| Developed by : Mario Jemic | --| mario.jemic@gmail.com | --+------------------------------------------------------------------+ --| Support our efforts by donating | --| Paypal: https://goo.gl/9Rj74e | --+------------------------------------------------------------------+ --| Patreon : https://goo.gl/GdXWeN | --| BitCoin : 15VCJTLaz12Amr7adHSBtL9v8XomURo9RF | --| BitCoin Cash: 1BEtS465S3Su438Kc58h2sqvVvHK9Mijtg | --| Ethereum : 0x8C110cD61538fb6d7A2B47858F0c0AaBd663068D | --| LiteCoin : LLU8PSY2vsq7B9kRELLZQcKf5nJQrdeqwD | --+------------------------------------------------------------------+ -- http://vtsystems.com/resources/helps/0000/HTML_VTtrader_Help_Manual/index.html?ti_donchianchannel.html -- -- initializes the indicator function Init() -- indicator:fail() indicator:name("Donchian Channel") indicator:description("The simple trend-following indicator. Shows highest high and lowest low for the specified number of periods."); indicator:requiredSource(core.Bar); indicator:type(core.Indicator); indicator.parameters:addGroup("Calculation"); indicator.parameters:addInteger("N", "Number of periods", "", 20, 2, 10000); indicator.parameters:addString("MD", "Show Close or High/Low", "", "Close"); indicator.parameters:addStringAlternative("MD", "Close", "", "Close"); indicator.parameters:addStringAlternative("MD", "High/Low", "", "HighLow"); indicator.parameters:addGroup("Selector"); indicator.parameters:addString("SHL", "Show High/Low lines", "Show High/Low lines", "Both"); indicator.parameters:addStringAlternative("SHL", "Both lines", "", "Both"); indicator.parameters:addStringAlternative("SHL", "High only", "", "High"); indicator.parameters:addStringAlternative("SHL", "Low only", "", "Low"); indicator.parameters:addBoolean("SM", "Show middle line", "", true); indicator.parameters:addBoolean("SUB", "Show Sub Levels", "", false); indicator.parameters:addBoolean("AC", "Analyze the current period", "", true); indicator.parameters:addGroup("Style"); indicator.parameters:addColor("clrDU", "Color of the Up line", "", core.rgb(255, 255, 0)); indicator.parameters:addInteger("widthDU", "Up Line Width", "", 1, 1, 5); indicator.parameters:addInteger("styleDU", "Up Line Style", "", core.LINE_SOLID); indicator.parameters:setFlag("styleDU", core.FLAG_LINE_STYLE); indicator.parameters:addColor("clrDN", "Color of the Down line", "", core.rgb(255, 255, 0)); indicator.parameters:addInteger("widthDN", "Down Line Width", "", 1, 1, 5); indicator.parameters:addInteger("styleDN", "Down Line Style", "", core.LINE_SOLID); indicator.parameters:setFlag("styleDN", core.FLAG_LINE_STYLE); indicator.parameters:addColor("clrDM", "Color of the middle line", "", core.rgb(255, 255, 0)); indicator.parameters:addInteger("widthDM", "Middle Line Width", "", 1, 1, 5); indicator.parameters:addInteger("styleDM", "Middle Line Style", "", core.LINE_SOLID); indicator.parameters:setFlag("styleDM", core.FLAG_LINE_STYLE); indicator.parameters:addColor("clrSUB", "Color of the Sub Level lines", "", core.rgb(255, 255, 0)); indicator.parameters:addInteger("widthSUB", "Sub Level Line Width", "", 1, 1, 5); indicator.parameters:addInteger("styleSUB", "Sub Level Line Style", "", core.LINE_SOLID); indicator.parameters:setFlag("styleSUB", core.FLAG_LINE_STYLE); end local first = 0; local n = 0; local ac; local sm; local source = nil; local dn = nil; local du = nil; local dm = nil; local MODE=nil; local SUB; local SHL; local low, high; -- initializes the instance of the indicator function Prepare(nameOnly) SUB = instance.parameters.SUB; SHL = instance.parameters.SHL; source = instance.source; n = instance.parameters.N; MODE=instance.parameters.MD; ac =instance.parameters.AC; sm = instance.parameters.SM; first = n + source:first() - 1; if (not ac) then first = first + 1; end local name = profile:id() .. "(" .. source:name() .. "," .. n .. ")"; instance:name(name); if (nameOnly) then return; end if (SHL == "High" or SHL == "Both") then du = instance:addStream("DU", core.Line, name .. ".DU", "U", instance.parameters.clrDU, first) du:setWidth(instance.parameters.widthDU); du:setStyle(instance.parameters.styleDU); else du = instance:addInternalStream(0, 0) end if SHL == "Low" or SHL == "Both" then dn = instance:addStream("DN", core.Line, name .. ".DN", "D", instance.parameters.clrDN, first) dn:setWidth(instance.parameters.widthDN); dn:setStyle(instance.parameters.styleDN); else dn = instance:addInternalStream(0, 0) end if (sm) then dm = instance:addStream("DM", core.Line, name .. ".DM", "M", instance.parameters.clrDM, first) dm:setWidth(instance.parameters.widthDM); dm:setStyle(instance.parameters.styleDM); else dm = instance:addInternalStream(0); end if SUB then high = instance:addStream("high", core.Line, name .. ".DMU", "S", instance.parameters.clrSUB, first) high:setWidth(instance.parameters.widthSUB); high:setStyle(instance.parameters.styleSUB); low = instance:addStream("low", core.Line, name .. ".DMD", "S", instance.parameters.clrSUB, first) low:setWidth(instance.parameters.widthSUB); low:setStyle(instance.parameters.styleSUB); end end -- calculate the value function Update(period) if (period >= first) then local range; if (ac) then range = core.rangeTo(period, n); else range = core.rangeTo(period - 1, n); end if MODE=="Close" then du[period] = core.max(source.close, range); dn[period] = core.min(source.close, range); else du[period] = core.max(source.high, range); dn[period] = core.min(source.low, range); end dm[period] = (du[period] + dn[period]) / 2; if SUB then high[period]= (du[period] + dm[period]) / 2; low[period]= (dn[period] + dm[period]) / 2; end end end