//+------------------------------------------------------------------+
//|                                            ForecastOscilator.mq5 |
//|                Copyright © 2005, Nick Bilak, beluck[AT]gmail.com |
//|                                    http://metatrader.50webs.com/ |
//+------------------------------------------------------------------+
//---- author of the indicator
#property copyright "Copyright © 2005, Nick Bilak"
//---- link to the website of the author
#property link      "http://metatrader.50webs.com/"
//---- indicator version
#property version   "1.00"
//---- drawing the indicator in a separate window
#property indicator_separate_window 
//---- 4 buffers are used for calculation and drawing the indicator
#property indicator_buffers 4
//---- 4 plots are used
#property indicator_plots   4
//+----------------------------------------------+
//|  Indicator 1 drawing parameters              |
//+----------------------------------------------+
//---- drawing the indicator 1 as a line
#property indicator_type1   DRAW_LINE
//---- cornflowerblue color is used for the indicator line
#property indicator_color1  CornflowerBlue
//---- indicator 1 line width is equal to 1
#property indicator_width1  1
//---- displaying the indicator label
#property indicator_label1  "Forecast Oscilator"
//+----------------------------------------------+
//|  Indicator 2 drawing parameters              |
//+----------------------------------------------+
//---- drawing the indicator 2 as a line
#property indicator_type2   DRAW_LINE
//---- use orange color for the indicator
#property indicator_color2  Orange
//---- indicator 2 line width is equal to 1
#property indicator_width2  1
//---- displaying the indicator label
#property indicator_label2 "Signal line"
//+----------------------------------------------+
//|  Bearish indicator drawing parameters        |
//+----------------------------------------------+
//---- drawing the indicator 3 as a symbol
#property indicator_type3   DRAW_ARROW
//---- Magenta color is used for the indicator
#property indicator_color3  Magenta
//---- the indicator 3 line width is equal to 4
#property indicator_width3  4
//---- displaying the indicator label
#property indicator_label3  "Sell"
//+----------------------------------------------+
//|  Bullish indicator drawing parameters        |
//+----------------------------------------------+
//---- drawing the indicator 4 as a symbol
#property indicator_type4   DRAW_ARROW
//---- lime color is used for the indicator
#property indicator_color4  Lime
//---- the indicator 4 line width is equal to 4
#property indicator_width4  4
//---- displaying the indicator label
#property indicator_label4 "Buy"
//+----------------------------------------------+
//|  Declaration of enumeration                  |
//+----------------------------------------------+
enum Applied_price_      // Type of 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_SIMPLE,         // Simple Price (OC/2)
   PRICE_QUARTER_,       // Quarted Price (HLOC/4) 
   PRICE_TRENDFOLLOW0_,  // TrendFollow_1 Price 
   PRICE_TRENDFOLLOW1_   // TrendFollow_2 Price 
  };
//+----------------------------------------------+
//|  Indicator input parameters                  |
//+----------------------------------------------+
input uint   length=15;
input uint   t3=3;
input double b=0.7;
input Applied_price_ IPC=PRICE_CLOSE_;// Price constant
//+----------------------------------------------+
//---- declaration of dynamic arrays that
//---- will be used as indicator buffers
double BuyBuffer[];
double SellBuffer[];
double IndBuffer[],SigBuffer[];
//----
int min_rates_total;
double b2,b3,c1,c2,c3,c4,w1,w2,n,Kx,Br;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
void OnInit()
  {
//---- initialization of global variables
   b2=b*b;
   b3=b2*b;
   c1=-b3;
   c2=(3*(b2+b3));
   c3=-3*(2*b2+b+b3);
   c4=(1+3*b+b3+3*b2);
//----
   n=MathMax(n,t3);
   n=1+0.5*(n-1);
   w1=2/(n+1);
   w2=1-w1;
   Kx=6.0/(length*(length+1.0));
   Br=(length+1.0)/3.0;
   min_rates_total=int(length+1);

//---- set IndBuffer[] dynamic array as an indicator buffer
   SetIndexBuffer(0,IndBuffer,INDICATOR_DATA);
//---- shifting the start of drawing the indicator 1
   PlotIndexSetInteger(0,PLOT_DRAW_BEGIN,min_rates_total+1);
//---- restriction to draw empty values for the indicator
   PlotIndexSetDouble(0,PLOT_EMPTY_VALUE,EMPTY_VALUE);

//---- set SigBuffer[] dynamic array as an indicator buffer
   SetIndexBuffer(1,SigBuffer,INDICATOR_DATA);
//---- shifting the start of drawing the indicator 2
   PlotIndexSetInteger(1,PLOT_DRAW_BEGIN,min_rates_total+1);
//---- restriction to draw empty values for the indicator
   PlotIndexSetDouble(1,PLOT_EMPTY_VALUE,EMPTY_VALUE);

//---- set SellBuffer[] dynamic array as an indicator buffer
   SetIndexBuffer(2,SellBuffer,INDICATOR_DATA);
//---- shifting the start of drawing the indicator 3
   PlotIndexSetInteger(2,PLOT_DRAW_BEGIN,min_rates_total+1);
//---- indicator symbol
   PlotIndexSetInteger(2,PLOT_ARROW,158);
//---- restriction to draw empty values for the indicator
   PlotIndexSetDouble(2,PLOT_EMPTY_VALUE,EMPTY_VALUE);

//---- set BuyBuffer[] dynamic array as an indicator buffer
   SetIndexBuffer(3,BuyBuffer,INDICATOR_DATA);
//---- shifting the start of drawing the indicator 4
   PlotIndexSetInteger(3,PLOT_DRAW_BEGIN,min_rates_total+1);
//---- indicator symbol
   PlotIndexSetInteger(3,PLOT_ARROW,158);
//---- restriction to draw empty values for the indicator
   PlotIndexSetDouble(3,PLOT_EMPTY_VALUE,EMPTY_VALUE);

//---- setting the format of accuracy of displaying the indicator
   IndicatorSetInteger(INDICATOR_DIGITS,_Digits);
//---- name for the data window and the label for sub-windows 
   string short_name="Forecast Oscilator";
   IndicatorSetString(INDICATOR_SHORTNAME,short_name);
//----   
  }
//+------------------------------------------------------------------+
//| 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[])
  {
//---- checking the number of bars to be enough for the calculation
   if(rates_total<min_rates_total) return(0);

//---- declarations of local variables 
   int first,bar;
   double WT,forecastosc,t3_fosc,sum,e1,e2,e3,e4,e5,e6,tmp,tmp2;
   static double e1_,e2_,e3_,e4_,e5_,e6_;

//--- calculations of the necessary amount of data to be copied and
//---- and the 'limit' starting index for the bars recalculation loop
   if(prev_calculated>rates_total || prev_calculated<=0)// checking for the first start of the indicator calculation
     {
      first=min_rates_total+1; // starting index for calculation of all bars
      e1_=0.0;
      e2_=0.0;
      e3_=0.0;
      e4_=0.0;
      e5_=0.0;
      e6_=0.0;
     }
   else
     {
      first=prev_calculated-1; // starting index for calculation of new bars
     }

//---- restore values of the variables
   e1=e1_;
   e2=e2_;
   e3=e3_;
   e4=e4_;
   e5=e5_;
   e6=e6_;

//---- main indicator calculation loop
   for(bar=first; bar<rates_total && !IsStopped(); bar++)
     {
      //---- store values of the variables before running at the current bar
      if(rates_total!=prev_calculated && bar==rates_total-1)
        {
         e1_=e1;
         e2_=e2;
         e3_=e3;
         e4_=e4;
         e5_=e5;
         e6_=e6;
        }

      sum=0.0;
      for(int i=int(length); i>0; i--)
        {
         tmp=Br;
         tmp2=i;
         tmp=tmp2-tmp;
         sum+=tmp*PriceSeries(IPC,bar-length+i,open,low,high,close);
        }

      WT=sum*Kx;
      //----
      forecastosc=(PriceSeries(IPC,bar,open,low,high,close)-WT)/WT*100;
      e1=w1*forecastosc + w2*e1;
      e2=w1*e1 + w2*e2;
      e3=w1*e2 + w2*e3;
      e4=w1*e3 + w2*e4;
      e5=w1*e4 + w2*e5;
      e6=w1*e5 + w2*e6;
      //----
      t3_fosc=c1*e6+c2*e5+c3*e4+c4*e3;
      IndBuffer[bar]=forecastosc;
      SigBuffer[bar]=t3_fosc;
      BuyBuffer [bar]=EMPTY_VALUE;
      SellBuffer[bar]=EMPTY_VALUE;
      //----
      if(IndBuffer[bar-1] > SigBuffer[bar-2] && IndBuffer[bar-2]<=SigBuffer[bar-3] && SigBuffer[bar-1]<0) BuyBuffer [bar-1]=t3_fosc-0.05;
      if(IndBuffer[bar-1] < SigBuffer[bar-2] && IndBuffer[bar-2]>=SigBuffer[bar-3] && SigBuffer[bar-1]>0) SellBuffer[bar-1]=t3_fosc+0.05;
     }
//----     
   return(rates_total);
  }
//+------------------------------------------------------------------+   
//| Getting values of a price timeseries                             |
//+------------------------------------------------------------------+ 
double PriceSeries(uint applied_price, // applied price
                   uint   bar,         // index of shift relative to the current bar for a specified number of periods back or forward
                   const double &Open[],
                   const double &Low[],
                   const double &High[],
                   const double &Close[])
  {
//----
   switch(applied_price)
     {
      //---- price constants from the ENUM_APPLIED_PRICE enumeration
      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]);
           }
         break;
        }
      //----
      default: return(Close[bar]);
     }
//----
  }
//+------------------------------------------------------------------+