Wilders_Trailing_Stop

ÿþ//+------------------------------------------------------------------+

//|                                        Wilders_Trailing_Stop.mq5 |

//|                        Copyright 2018, MetaQuotes Software Corp. |

//|                                                 https://mql5.com |

//+------------------------------------------------------------------+

#property copyright "Copyright 2018, MetaQuotes Software Corp."

#property link      "https://mql5.com"

#property version   "1.00"

#property description "Wilders Trailing Stop indicator"

#property indicator_chart_window

#property indicator_buffers 4

#property indicator_plots   2

//--- plot UP

#property indicator_label1  "Bearish WTS"

#property indicator_type1   DRAW_LINE

#property indicator_color1  clrRed

#property indicator_style1  STYLE_SOLID

#property indicator_width1  1

//--- plot DN

#property indicator_label2  "Bullish WTS"

#property indicator_type2   DRAW_LINE

#property indicator_color2  clrGreen

#property indicator_style2  STYLE_SOLID

#property indicator_width2  1

//--- input parameters

input uint     InpPeriod   =  5;    // Period

input double   InpCoeff    =  3.5;  // ATR coefficient

//--- indicator buffers

double         BufferUP[];

double         BufferDN[];

double         BufferATR[];

double         BufferWTS[];

//--- global variables

double         coeff;

int            period;

int            handle_atr;

//+------------------------------------------------------------------+

//| Custom indicator initialization function                         |

//+------------------------------------------------------------------+

int OnInit()

  {

//--- setting global variables

   period=int(InpPeriod<1 ? 1 : InpPeriod);

   coeff=InpCoeff;

//--- indicator buffers mapping

   SetIndexBuffer(0,BufferUP,INDICATOR_DATA);

   SetIndexBuffer(1,BufferDN,INDICATOR_DATA);

   SetIndexBuffer(2,BufferATR,INDICATOR_CALCULATIONS);

   SetIndexBuffer(3,BufferWTS,INDICATOR_CALCULATIONS);

//--- settings indicators parameters

   IndicatorSetInteger(INDICATOR_DIGITS,Digits());

   IndicatorSetString(INDICATOR_SHORTNAME,"Wilders Trailing Stop("+(string)period+","+DoubleToString(coeff,1)+")");

//--- setting buffer arrays as timeseries

   ArraySetAsSeries(BufferUP,true);

   ArraySetAsSeries(BufferDN,true);

   ArraySetAsSeries(BufferATR,true);

   ArraySetAsSeries(BufferWTS,true);

//--- create handle ATR

   ResetLastError();

   handle_atr=iATR(NULL,PERIOD_CURRENT,period);

   if(handle_atr==INVALID_HANDLE)

     {

      Print("The iATR(",(string)period,") object was not created: Error ",GetLastError());

      return INIT_FAILED;

     }

//---

   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[])

  {

//--- #AB0=>2:0 <0AA82>2 1CD5@>2 :0: B09<A5@89

   ArraySetAsSeries(close,true);

//--- @>25@:0 :>;8G5AB20 4>ABC?=KE 10@>2

   if(rates_total<4) return 0;

//--- @>25@:0 8 @0AGQB :>;8G5AB20 ?@>AG8BK205<KE 10@>2

   int limit=rates_total-prev_calculated;

   if(limit>1)

     {

      limit=rates_total-2;

      ArrayInitialize(BufferUP,EMPTY_VALUE);

      ArrayInitialize(BufferDN,EMPTY_VALUE);

      ArrayInitialize(BufferATR,0);

      ArrayInitialize(BufferWTS,0);

     }

//--- >43>B>2:0 40==KE

   int copied=0,count=(limit==0 ? 1 : rates_total);

   copied=CopyBuffer(handle_atr,0,0,count,BufferATR);

   if(copied!=count) return 0;



//---  0AGQB 8=48:0B>@0

   for(int i=limit; i>=0; i--)

     {

      double loss=BufferATR[i]*coeff;

      if(close[i]>BufferWTS[i+1] && close[i+1]>BufferWTS[i+1])

        {

         BufferDN[i]=BufferWTS[i]=fmax(BufferWTS[i+1],close[i]-loss);

         BufferUP[i]=EMPTY_VALUE;

        }

      else

        {

         if(close[i]<BufferWTS[i+1] && close[i+1]<BufferWTS[i+1])

           {

            BufferUP[i]=BufferWTS[i]=fmin(BufferWTS[i+1],close[i]+loss);

            BufferDN[i]=EMPTY_VALUE;

           }

         else

           {

            if(close[i]>BufferWTS[i+1])

              {

               BufferDN[i]=BufferWTS[i]=close[i]-loss;

               BufferUP[i]=EMPTY_VALUE;

              }

            else

              {

               BufferUP[i]=BufferWTS[i]=close[i]+loss;

               BufferDN[i]=EMPTY_VALUE;

              }

           }

        }

     }

   

//--- return value of prev_calculated for next call

   return(rates_total);

  }

//+------------------------------------------------------------------+