//+------------------------------------------------------------------+
//|                                                  EF_distance.mq5 | 
//|                                     Copyright © 2006, Doji Starr | 
//|                                                                  | 
//+------------------------------------------------------------------+ 
#property copyright "Copyright © 2006, Doji Starr"
#property link ""
//---- indicator version number
#property version   "1.00"
//---- drawing the indicator in the main window
#property indicator_chart_window 
//---- number of indicator buffers
#property indicator_buffers 1 
//---- only one plot is used
#property indicator_plots   1
//+-----------------------------------+
//|  Indicator drawing parameters     |
//+-----------------------------------+
//---- drawing the indicator as a line
#property indicator_type1   DRAW_LINE
//---- gold color is used for the indicator line
#property indicator_color1 clrGold
//---- the indicator line is a continuous curve
#property indicator_style1  STYLE_SOLID
//---- Indicator line width is equal to 2
#property indicator_width1  2
//---- displaying the indicator label
#property indicator_label1  "EF_distance"
//+-----------------------------------+
//|  Declaration of enumerations      |
//+-----------------------------------+
enum Applied_price_ //Type od constant
  {
   PRICE_CLOSE_ = 1,     //Close
   PRICE_OPEN_,          //Open
   PRICE_HIGH_,          //High
   PRICE_LOW_,           //Low
   PRICE_MEDIAN_,        //Median Price (HL/2)
   PRICE_TYPICAL_,       //Typical Price (HLC/3)
   PRICE_WEIGHTED_,      //Weighted Close (HLCC/4)
   PRICE_SIMPL_,         //Simpl Price (OC/2)
   PRICE_QUARTER_,       //Quarted Price (HLOC/4) 
   PRICE_TRENDFOLLOW0_,  //TrendFollow_1 Price 
   PRICE_TRENDFOLLOW1_,  //TrendFollow_2 Price
   PRICE_DEMARK_         //Demark Price
  };
//+-----------------------------------+
//|  INDICATOR INPUT PARAMETERS       |
//+-----------------------------------+
input int Length=10; //smoothing depth                    
input uint Power=2.0; //averaging power
input Applied_price_ IPC=PRICE_CLOSE;//price constant
/* , used for calculation of the indicator ( 1-CLOSE, 2-OPEN, 3-HIGH, 4-LOW, 
  5-MEDIAN, 6-TYPICAL, 7-WEIGHTED, 8-SIMPL, 9-QUARTER, 10-TRENDFOLLOW, 11-0.5 * TRENDFOLLOW.) */
input int Shift=0; // horizontal shift of the indicator in bars
input int PriceShift=0; // vertical shift of the indicator in pointsõ
//+-----------------------------------+

//---- declaration of a dynamic array that further 
// will be used as an indicator buffer
double IndBuffer[];

//---- declaration of global variables to create ring buffers
int Count[];
double Res[];
//---- Declaration of the average vertical shift value variable
double dPriceShift;
//---- Declaration of integer variables of data starting point
int min_rates_total;
//+------------------------------------------------------------------+   
//| EF_distance indicator initialization function                    | 
//+------------------------------------------------------------------+ 
void OnInit()
  {
//---- Initialization of variables of the start of data calculation
   min_rates_total=int(2*Length);

//---- Initialization of the vertical shift
   dPriceShift=_Point*PriceShift;

//---- memory allocation for the ring buffers
   ArrayResize(Count,Length);
   ArrayResize(Res,Length);

   ArrayInitialize(Count,0);
   ArrayInitialize(Res,0.0);

//---- set dynamic array as an indicator buffer
   SetIndexBuffer(0,IndBuffer,INDICATOR_DATA);
//---- moving the indicator 1 horizontally
   PlotIndexSetInteger(0,PLOT_SHIFT,Shift);
//---- performing the shift of beginning of indicator drawing
   PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,min_rates_total);
//---- setting the indicator values that won't be visible on a chart
   PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,0);

//---- initializations of variable for indicator short name
   string shortname;
   StringConcatenate(shortname,"EF_distance(",Length,", ",Power,")");
//--- creation of the name to be displayed in a separate sub-window and in a pop up help
   IndicatorSetString(INDICATOR_SHORTNAME,shortname);

//--- determining the accuracy of displaying the indicator values
   IndicatorSetInteger(INDICATOR_DIGITS,_Digits+1);
//---- end of initialization
  }
//+------------------------------------------------------------------+ 
//| EF_distance iteration function                                   | 
//+------------------------------------------------------------------+ 
int OnCalculate(
                const int rates_total,    // amount of history in bars at the current tick
                const int prev_calculated,// amount of history in bars at the previous tick
                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[]
                )
  {
//---- checking the number of bars to be enough for calculation
   if(rates_total<min_rates_total) return(0);

//---- declaration of variables with a floating point  
   double price_,val,norm;
//---- Declaration of integer variables and getting the bars already calculated
   int first,bar,iii;

//---- calculation of the starting number first for the bar recalculation loop
   if(prev_calculated>rates_total || prev_calculated<=0) // checking for the first start of calculation of an indicator
      first=int(Length); // starting number for calculation of all bars
   else first=prev_calculated-1; // starting number for calculation of new bars

//---- Main calculation loop of the indicator
   for(bar=first; bar<rates_total && !IsStopped(); bar++)
     {
      //---- Calling the PriceSeries function to get the input price price_
      price_=PriceSeries(IPC,bar,open,low,high,close);
      Res[Count[0]]=0.0;
      for(iii=0; iii<int(Length); iii++) Res[Count[0]]+=MathAbs(MathPow(price_-PriceSeries(IPC,bar-iii,open,low,high,close),Power));

      norm=0.0;
      val=0.0;
      for(iii=0; iii<int(Length); iii++)
        {
         norm+=Res[Count[iii]];
         val+=Res[Count[iii]]*PriceSeries(IPC,bar-iii,open,low,high,close);
        }

      if(norm) val/=norm;
      else val=0.0;
      //----       
      if(bar>=int(Length)) IndBuffer[bar]=val+dPriceShift;
      else IndBuffer[bar]=0.0;
      if(bar<rates_total-1) Recount_ArrayZeroPos(Count,Length);
     }
//----     
   return(rates_total);
  }
//+------------------------------------------------------------------+
//| PriceSeries() function                                           |
//+------------------------------------------------------------------+
double PriceSeries
(
 uint applied_price,// Price constant
 uint   bar,// Shift index relative to the current bar by a specified number of periods backward or forward).
 const double &Open[],
 const double &Low[],
 const double &High[],
 const double &Close[]
 )
//PriceSeries(applied_price, bar, open, low, high, close)
//+ - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -+
  {
//----+
   switch(applied_price)
     {
      //----+ Price constants from the enumeration ENUM_APPLIED_PRICE
      case  PRICE_CLOSE: return(Close[bar]);
      case  PRICE_OPEN: return(Open [bar]);
      case  PRICE_HIGH: return(High [bar]);
      case  PRICE_LOW: return(Low[bar]);
      case  PRICE_MEDIAN: return((High[bar]+Low[bar])/2.0);
      case  PRICE_TYPICAL: return((Close[bar]+High[bar]+Low[bar])/3.0);
      case  PRICE_WEIGHTED: return((2*Close[bar]+High[bar]+Low[bar])/4.0);

      //----+                            
      case  8: return((Open[bar] + Close[bar])/2.0);
      case  9: return((Open[bar] + Close[bar] + High[bar] + Low[bar])/4.0);
      //----                                
      case 10:
        {
         if(Close[bar]>Open[bar])return(High[bar]);
         else
           {
            if(Close[bar]<Open[bar])
               return(Low[bar]);
            else return(Close[bar]);
           }
        }
      //----         
      case 11:
        {
         if(Close[bar]>Open[bar])return((High[bar]+Close[bar])/2.0);
         else
           {
            if(Close[bar]<Open[bar])
               return((Low[bar]+Close[bar])/2.0);
            else return(Close[bar]);
           }
        }
      //----         
      case 12:
        {
         double res=High[bar]+Low[bar]+Close[bar];

         if(Close[bar]<Open[bar]) res=(res+Low[bar])/2;
         if(Close[bar]>Open[bar]) res=(res+High[bar])/2;
         if(Close[bar]==Open[bar]) res=(res+Close[bar])/2;
         return(((res-Low[bar])+(res-High[bar]))/2);
        }
      //----
      default: return(Close[bar]);
     }
//----+
//return(0);
  }
//+------------------------------------------------------------------+
//|  Recalculation of position of the newest element in the array    |
//+------------------------------------------------------------------+   
void Recount_ArrayZeroPos(
                          int &CoArr[],// Return the current value of the price series by the link
                          int Size  // Indicator buffer size
                          )
  {
//----
   int numb,Max1,Max2;
   static int count=1;

   Max2=Size;
   Max1=Max2-1;

   count--;
   if(count<0) count=Max1;

   for(int iii=0; iii<Max2; iii++)
     {
      numb=iii+count;
      if(numb>Max1) numb-=Max2;
      CoArr[iii]=numb;
     }
//----
  }
//+------------------------------------------------------------------+