MA HISTOGRAM SEPARATE WINDOW

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

//|                                                      ProjectName |

//|                                      Copyright 2020, CompanyName |

//|                                       http://www.companyname.net |

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

#property copyright "Copyright 2020, Szymon PalczyD
ski and Masood Abak"

#property link      "https://www.mql5.com/en/users/stiopa"

#property version   "1.00"

#property strict

#property indicator_separate_window

#property indicator_buffers 2



//--- External Variable

extern  int                PeriodMA    = 7;            // MA Period

extern  ENUM_MA_METHOD     MethodMA    = MODE_SMMA;    // MA Method

extern  ENUM_APPLIED_PRICE AppliedToMA = PRICE_MEDIAN; // MA Applied to



double Buffer_1[];

double Buffer_2[];

double Buffer_3[];



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

//| Custom indicator initialization function                         |

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

int OnInit()

{

//--- add a buffer used for calculations

   IndicatorBuffers(3);



//--- indicator buffers mapping   

   int DrawBeginIndex = PeriodMA*2;

   

   SetIndexBuffer(0,Buffer_1);

   SetIndexStyle(0,DRAW_HISTOGRAM,EMPTY,3,clrRed);

   SetIndexDrawBegin(0,DrawBeginIndex);

   SetIndexLabel(0,"Histogram Buffer (Red)");

        

   SetIndexBuffer(1,Buffer_2);

   SetIndexStyle(1,DRAW_HISTOGRAM,EMPTY,3,clrBlue);

   SetIndexDrawBegin(1,DrawBeginIndex);

   SetIndexLabel(1,"Histogram Buffer (Blue)");



   SetIndexBuffer(2,Buffer_3);

   SetIndexStyle(2,DRAW_NONE);

   SetIndexDrawBegin(2,DrawBeginIndex);

   SetIndexLabel(2,"Temprary Buffer");

//--- indicator name

   IndicatorShortName("MA HISTOGRAM SEPARATE WINDOW ("+IntegerToString(PeriodMA)+")");

//--- set indicator digits   

   IndicatorDigits(_Digits);

          

//---

   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[])

{

  

  //--- check to have enough bars

   int limit = rates_total - PeriodMA;

   if(rates_total <= limit)

      return(0);

     

  //--- before the first run of OnCalculate

   limit = limit - prev_calculated;

     

   if(rates_total - prev_calculated == 0) limit = 1;  // after the first run of the OnCalculate      

   else limit++;                                      // on the first tick of a new bar

   

  //--- loop over bars to draw histogram 

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

   {

     //--- calculate sum  

      double sum = 0.0;

      

      for(int j=0; j<PeriodMA; j++)

         sum += iMA(_Symbol,PERIOD_CURRENT,PeriodMA,0,MethodMA,AppliedToMA,i+j);            

     //--- fill buffer to draw histogram 

      Buffer_3[i] = sum / PeriodMA;

      Buffer_1[i] = Buffer_3[i+1];

      Buffer_1[i] = Buffer_3[i] - Buffer_1[i];

      if(Buffer_3[i]>Buffer_3[i+1])

      Buffer_2[i]=Buffer_1[i];

      else

      Buffer_1[i]=Buffer_1[i];

   }

      

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

   return(rates_total);

}

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