//+------------------------------------------------------------------+ //| EngulfingStochastic.mq5 | //| Jay Davis | //| https://www.tidyneat.com | //+------------------------------------------------------------------+ #property copyright "Jay Davis" #property link "https://www.mql5.com/en/blogs/post/724674" #property version "1.00" #property description "Detect bullish and bearish engulfing candles when entering overbought or oversold territory" #property indicator_separate_window #property indicator_buffers 6 #property indicator_plots 6 //--- the Stochastic plot #property indicator_label1 "Stochastic" #property indicator_type1 DRAW_LINE #property indicator_color1 clrLightSeaGreen #property indicator_style1 STYLE_SOLID #property indicator_width1 1 //--- the Signal plot #property indicator_label2 "Signal" #property indicator_type2 DRAW_LINE #property indicator_color2 clrRed #property indicator_style2 STYLE_DOT #property indicator_width2 1 //--- the Bullish Engulfing OverSold symbol #property indicator_label3 "Bullish_OverSold" #property indicator_type3 DRAW_ARROW #property indicator_color3 clrOrange #property indicator_width3 3 //--- the Bearish Engulfing OverSold symbol #property indicator_label4 "Bearish OverSold" #property indicator_type4 DRAW_ARROW #property indicator_color4 clrOrange #property indicator_width4 3 //--- the Bullish Engulfing OverBought symbol #property indicator_label5 "Bullish_OverBought" #property indicator_type5 DRAW_ARROW #property indicator_color5 clrCornflowerBlue #property indicator_width5 3 //--- the Bearish Engulfing OverBought symbol #property indicator_label6 "Bearish_OverBought" #property indicator_type6 DRAW_ARROW #property indicator_color6 clrCornflowerBlue #property indicator_width6 3 //--- set limit of the indicator values #property indicator_minimum 0 #property indicator_maximum 100 //--- horizontal levels in the indicator window #property indicator_level1 80.0 #property indicator_level2 20.0 //+------------------------------------------------------------------+ //| Enumeration of the methods of handle creation | //+------------------------------------------------------------------+ enum Creation { Call_iStochastic, // use iStochastic Call_IndicatorCreate // use IndicatorCreate }; //--- input parameters input int overSold=20; // Over Sold input int overBought=80;// Over Bought input Creation type=Call_IndicatorCreate; // type of the function input int Kperiod=5; // the K period (the number of bars for calculation) input int Dperiod=3; // the D period (the period of primary smoothing) input int slowing=3; // period of final smoothing input ENUM_MA_METHOD ma_method=MODE_SMA; // type of smoothing input ENUM_STO_PRICE price_field=STO_LOWHIGH; // method of calculation of the Stochastic input string symbol=" "; // symbol input ENUM_TIMEFRAMES period=PERIOD_CURRENT; // timeframe //--- indicator buffers double StochasticBuffer[]; double SignalBuffer[]; double BullishOverSold[]; double BearishOverSold[]; double BullishOverBought[]; double BearishOverBought[]; //--- variable for storing the handle of the iStochastic indicator int handle; //--- variable for storing string name=symbol; //--- name of the indicator on a chart string short_name; //--- we will keep the number of values in the Stochastic Oscillator indicator int bars_calculated=0; //+------------------------------------------------------------------+ //| Custom indicator initialization function | //+------------------------------------------------------------------+ int OnInit() { //--- set descriptions of horizontal levels string display = "OverBought "+ (string) overBought; IndicatorSetString(INDICATOR_LEVELTEXT,0,display); display = "OverSold "+ (string) overSold; IndicatorSetString(INDICATOR_LEVELTEXT,1,display); //--- set horizontal levels accoring to input overbought and oversold IndicatorSetDouble(INDICATOR_LEVELVALUE,0,overBought); IndicatorSetDouble(INDICATOR_LEVELVALUE,1,overSold); //--- assignment of arrays to indicator buffers SetIndexBuffer(0,StochasticBuffer,INDICATOR_DATA); SetIndexBuffer(1,SignalBuffer,INDICATOR_DATA); SetIndexBuffer(2,BullishOverSold,INDICATOR_DATA); SetIndexBuffer(3,BearishOverSold,INDICATOR_DATA); SetIndexBuffer(4,BullishOverBought,INDICATOR_DATA); SetIndexBuffer(5,BearishOverBought,INDICATOR_DATA); //PlotIndexSetInteger(2,PLOT_DRAW_TYPE,DRAW_ARROW,50); PlotIndexSetInteger(2,PLOT_ARROW,236); PlotIndexSetInteger(3,PLOT_ARROW,238); PlotIndexSetInteger(4,PLOT_ARROW,236); PlotIndexSetInteger(5,PLOT_ARROW,238); //--- Set an empty value PlotIndexSetDouble(2,PLOT_EMPTY_VALUE,0); PlotIndexSetDouble(3,PLOT_EMPTY_VALUE,0); PlotIndexSetDouble(4,PLOT_EMPTY_VALUE,0); PlotIndexSetDouble(5,PLOT_EMPTY_VALUE,0); //--- determine the symbol the indicator is drawn for name=symbol; //--- delete spaces to the right and to the left StringTrimRight(name); StringTrimLeft(name); //--- if it results in zero length of the 'name' string if(StringLen(name)==0) { //--- take the symbol of the chart the indicator is attached to name=_Symbol; } //--- create handle of the indicator if(type==Call_iStochastic) handle=iStochastic(name,period,Kperiod,Dperiod,slowing,ma_method,price_field); else { //--- fill the structure with parameters of the indicator MqlParam pars[5]; //--- the K period for calculations pars[0].type=TYPE_INT; pars[0].integer_value=Kperiod; //--- the D period for primary smoothing pars[1].type=TYPE_INT; pars[1].integer_value=Dperiod; //--- the K period for final smoothing pars[2].type=TYPE_INT; pars[2].integer_value=slowing; //--- type of smoothing pars[3].type=TYPE_INT; pars[3].integer_value=ma_method; //--- method of calculation of the Stochastic pars[4].type=TYPE_INT; pars[4].integer_value=price_field; handle=IndicatorCreate(name,period,IND_STOCHASTIC,5,pars); } //--- if the handle is not created if(handle==INVALID_HANDLE) { //--- tell about the failure and output the error code PrintFormat("Failed to create handle of the iStochastic indicator for the symbol %s/%s, error code %d", name, EnumToString(period), GetLastError()); //--- the indicator is stopped early return(INIT_FAILED); } //--- show the symbol/timeframe the Stochastic Oscillator indicator is calculated for short_name=StringFormat("Stoch(%s, %d, %d, %d)",name,Kperiod,Dperiod,slowing); IndicatorSetString(INDICATOR_SHORTNAME,short_name); //--- normal initialization of the indicator return(INIT_SUCCEEDED); } //+------------------------------------------------------------------+ //| Custom indicator iteration function | //+------------------------------------------------------------------+ int OnCalculate(const int rates_total, const int prev_calculated, const datetime &time[], const double &open[], const double &high[], const double &low[], const double &close[], const long &tick_volume[], const long &volume[], const int &spread[]) { //--- set horizontal levels accoring to input overbought and oversold IndicatorSetDouble(INDICATOR_LEVELVALUE,0,overBought); IndicatorSetDouble(INDICATOR_LEVELVALUE,1,overSold); //--- number of values copied from the iStochastic indicator int values_to_copy; //--- determine the number of values calculated in the indicator int calculated=BarsCalculated(handle); if(calculated<=0) { PrintFormat("BarsCalculated() returned %d, error code %d",calculated,GetLastError()); return(0); } //--- if it is the first start of calculation of the indicator or if the number of values in the iStochastic indicator changed //---or if it is necessary to calculated the indicator for two or more bars (it means something has changed in the price history) if(prev_calculated==0 || calculated!=bars_calculated || rates_total>prev_calculated+1) { //--- if the StochasticBuffer array is greater than the number of values in the iStochastic indicator for symbol/period, then we don't copy everything //--- otherwise, we copy less than the size of indicator buffers if(calculated>rates_total) values_to_copy=rates_total; else values_to_copy=calculated; } else { //--- it means that it's not the first time of the indicator calculation, and since the last call of OnCalculate() //--- for calculation not more than one bar is added values_to_copy=(rates_total-prev_calculated)+1; } //--- fill the arrays with values of the iStochastic indicator //--- if FillArraysFromBuffer returns false, it means the information is nor ready yet, quit operation if(!FillArraysFromBuffers(StochasticBuffer,SignalBuffer,handle,values_to_copy)) return(0); //--- form the message string comm=StringFormat("%s ==> Updated value in the indicator %s: %d", TimeToString(TimeCurrent(),TIME_DATE|TIME_SECONDS), short_name, values_to_copy); //--- display the service message on the chart Comment(comm); //--- memorize the number of values in the Stochastic Oscillator indicator bars_calculated=calculated; //--- calculate OverBought and OverSold arrows OverBoughtAndSoldCalculations(rates_total,prev_calculated,open,close); //--- return the prev_calculated value for the next call return(rates_total); } //+------------------------------------------------------------------+ //| Displays OB and OS arrows when Engulfing is present | //+------------------------------------------------------------------+ void OverBoughtAndSoldCalculations(int total,int done, const double &open[], const double &close[]) { // input over sold and over bought calculations here for(int i=done; ioverBought && SignalBuffer[i-1]overSold) { // Is i bar Engulfing if(CheckForEngulfing(open[i-1],close[i-1],open[i],close[i])==true) { if(open[i]=close2 && close1<=open2 && open1=open2 && open1>open2)//Bullish Engulfing { return true; } return false; } //+------------------------------------------------------------------+ //| Filling indicator buffers from the iStochastic indicator | //+------------------------------------------------------------------+ bool FillArraysFromBuffers(double &main_buffer[], // indicator buffer of Stochastic Oscillator values double &signal_buffer[], // indicator buffer of the signal line int ind_handle, // handle of the iStochastic indicator int amount // number of copied values ) { //--- reset error code ResetLastError(); //--- fill a part of the StochasticBuffer array with values from the indicator buffer that has 0 index if(CopyBuffer(ind_handle,MAIN_LINE,0,amount,main_buffer)<0) { //--- if the copying fails, tell the error code PrintFormat("Failed to copy data from the iStochastic indicator, error code %d",GetLastError()); //--- quit with zero result - it means that the indicator is considered as not calculated return(false); } //--- fill a part of the SignalBuffer array with values from the indicator buffer that has index 1 if(CopyBuffer(ind_handle,SIGNAL_LINE,0,amount,signal_buffer)<0) { //--- if the copying fails, tell the error code PrintFormat("Failed to copy data from the iStochastic indicator, error code %d",GetLastError()); //--- quit with zero result - it means that the indicator is considered as not calculated return(false); } //--- everything is fine return(true); } //+------------------------------------------------------------------+ //| Indicator deinitialization function | //+------------------------------------------------------------------+ void OnDeinit(const int reason) { //--- clear the chart after deleting the indicator Comment(""); } //+------------------------------------------------------------------+