BOP

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

//|                                                          BOP.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 "Balance of Power oscillator"

#property indicator_separate_window

#property indicator_buffers 2

#property indicator_plots   1

//--- plot BOP

#property indicator_label1  "BOP"

#property indicator_type1   DRAW_COLOR_HISTOGRAM

#property indicator_color1  clrGreen,clrRed

#property indicator_style1  STYLE_SOLID

#property indicator_width1  2

//--- enums

enum ENUM_INPUT_YES_NO

  {

   INPUT_YES   =  1, // Yes

   INPUT_NO    =  0  // No

  };

//--- input parameters

input uint              InpPeriodAct      =  14;         // Period

input uint              InpPeriodRng      =  28;         // Range

input ENUM_INPUT_YES_NO InpUseLastPeriod  =  INPUT_YES;  // Use last period

//--- indicator buffers

double         BufferBOP[];

double         BufferColors[];

//--- global variables

int            period_act;

int            period_rng;

int            period_max;

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

//| Custom indicator initialization function                         |

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

int OnInit()

  {

//--- set global variables

   period_act=int(InpPeriodAct<1 ? 1 : InpPeriodAct);

   period_rng=int(InpPeriodRng<1 ? 1 : InpPeriodRng);

   period_max=fmax(period_act,period_rng);

//--- indicator buffers mapping

   SetIndexBuffer(0,BufferBOP,INDICATOR_DATA);

   SetIndexBuffer(1,BufferColors,INDICATOR_COLOR_INDEX);

//--- setting indicator parameters

   IndicatorSetString(INDICATOR_SHORTNAME,"Balance of Power ("+(string)period_act+","+(string)period_rng+")");

   IndicatorSetInteger(INDICATOR_DIGITS,Digits());

//--- setting buffer arrays as timeseries

   ArraySetAsSeries(BufferBOP,true);

   ArraySetAsSeries(BufferColors,true);

//---

   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(open,true);

   ArraySetAsSeries(high,true);

   ArraySetAsSeries(low,true);

   ArraySetAsSeries(close,true);

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

   if(rates_total<4 || Point()==0) return 0;

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

   int limit=rates_total-prev_calculated;

   if(limit>1)

     {

      limit=rates_total-period_max-1;

      ArrayInitialize(BufferBOP,EMPTY_VALUE);

     }

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

   for(int i=limit; i>=0 && !IsStopped(); i--)

     {

      int shift=(InpUseLastPeriod ? 0 : 1);

      int bh=Highest(period_rng,i+shift);

      int bl=Lowest(period_rng,i+shift);

      if(bh==WRONG_VALUE || bl==WRONG_VALUE)

         continue;

      double max=high[bh];

      double min=low[bl];

      BufferBOP[i]=(max!=min ? (close[i]-open[i+period_act-1])/(max-min) : 0);

      BufferColors[i]=(close[i]>min+(max-min)/2.0 ? 0 : 1);

     }



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

   return(rates_total);

  }

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

//| >72@0I05B 8=45:A <0:A8<0;L=>3> 7=0G5=8O B09<A5@88 High          |

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

int Highest(const int count,const int start)

  {

   double array[];

   ArraySetAsSeries(array,true);

   return(CopyHigh(Symbol(),PERIOD_CURRENT,start,count,array)==count ? ArrayMaximum(array)+start : WRONG_VALUE);

  }

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

//| >72@0I05B 8=45:A <8=8<0;L=>3> 7=0G5=8O B09<A5@88 Low            |

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

int Lowest(const int count,const int start)

  {

   double array[];

   ArraySetAsSeries(array,true);

   return(CopyLow(Symbol(),PERIOD_CURRENT,start,count,array)==count ? ArrayMinimum(array)+start : WRONG_VALUE);

   return WRONG_VALUE;

  }

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