3_Candles

//+------------------------------------------------------------------+
//|                                                    3 Candles.mq4 |
//|                                              Copyright 2016, Tor |
//|                                             http://einvestor.ru/ |
//+------------------------------------------------------------------+
#property copyright "Copyright 2016, Tor"
#property link      "http://einvestor.ru/"
#property version   "1.00"
#property strict
#property indicator_chart_window
#property indicator_buffers 2
#property indicator_plots   2

input int maxBar1=300;// Max Bar #1 size for disable Volume filter, pips
input bool CheckVolume=true;// Volume filter disable/enable
input bool alerts=true;// Alerts disable/enable

double up[],down[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
  {
//--- indicator buffers mapping
   SetIndexBuffer(0,up);
   SetIndexBuffer(1,down);
   IndicatorShortName("3 Candles");
   SetIndexStyle(0,DRAW_ARROW,STYLE_SOLID,1,clrBlue);//Buy
   SetIndexStyle(1,DRAW_ARROW,STYLE_SOLID,1,clrRed);//Sell
   SetIndexArrow(0,233);
   SetIndexArrow(1,234);
   SetIndexLabel(0,"Buy");
   SetIndexLabel(1,"Sell");
//---
   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[])
  {
//---
   int limit;
   static bool alrt=false;
   static datetime altime=0;

//---
   if(rates_total<=1){ return(0); }
//--- last counted bar will be recounted
   limit=rates_total-prev_calculated;
   if(prev_calculated>0)
      limit=limit+4;

   for(int x=limit-3; x>=0; x--)
     {
      bool chkVol=true;
      up[x]=EMPTY_VALUE;
      down[x]=EMPTY_VALUE;
      if((iHigh(_Symbol,_Period,x+3)-iLow(_Symbol,_Period,x+3))/_Point>maxBar1){ chkVol=false; }

      if(iOpen(_Symbol,_Period,x+3)<iClose(_Symbol,_Period,x+3) && iOpen(_Symbol,_Period,x+2)<iClose(_Symbol,_Period,x+2) && 
         iClose(_Symbol,_Period,x+2)<iHigh(_Symbol,_Period,x+3) && iOpen(_Symbol,_Period,x+1)>iClose(_Symbol,_Period,x+1) && 
         iClose(_Symbol,_Period,x+1)<iOpen(_Symbol,_Period,x+2))
        {

         if(CheckVolume && chkVol)
           {
            if((iVolume(_Symbol,_Period,x+3)<iVolume(_Symbol,_Period,x+2)) || 
               ((iVolume(_Symbol,_Period,x+1)>iVolume(_Symbol,_Period,x+2)) || (iVolume(_Symbol,_Period,x+1)>iVolume(_Symbol,_Period,x+3))))
              {

               down[x]=iOpen(_Symbol,_Period,x);
              }
              }else{
            down[x]=iOpen(_Symbol,_Period,x);
           }
        }

      if(iOpen(_Symbol,_Period,x+3)>iClose(_Symbol,_Period,x+3) && iOpen(_Symbol,_Period,x+2)>iClose(_Symbol,_Period,x+2) && 
         iClose(_Symbol,_Period,x+2)>iLow(_Symbol,_Period,x+3) && iOpen(_Symbol,_Period,x+1)<iClose(_Symbol,_Period,x+1) && 
         iClose(_Symbol,_Period,x+1)>iOpen(_Symbol,_Period,x+2))
        {

         if(CheckVolume && chkVol)
           {
            if((iVolume(_Symbol,_Period,x+3)<iVolume(_Symbol,_Period,x+2)) || 
               ((iVolume(_Symbol,_Period,x+1)>iVolume(_Symbol,_Period,x+2)) || (iVolume(_Symbol,_Period,x+1)>iVolume(_Symbol,_Period,x+3))))
              {

               up[x]=iOpen(_Symbol,_Period,x);
              }
              }else{
            up[x]=iOpen(_Symbol,_Period,x);
           }
        }

     }

   if(down[0]!=EMPTY_VALUE && down[0]>0)
     {
      if(alerts && Time[0]!=altime)
        {
         Alert("Signal Sell "+_Symbol+" TF "+(string)_Period);
         altime=Time[0];
        }
     }
   if(up[0]!=EMPTY_VALUE && up[0]>0)
     {
      if(alerts && Time[0]!=altime)
        {
         Alert("Signal Buy "+_Symbol+" TF "+(string)_Period);
         altime=Time[0];
        }
     }
//--- return value of prev_calculated for next call
   return(rates_total);
  }
//+------------------------------------------------------------------+