//+------------------------------------------------------------------+
//|                                                   Stochastic.mq4 |
//|                      Copyright © 2004, MetaQuotes Software Corp. |
//|                                       http://www.metaquotes.net/ |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2004, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net/"

#property indicator_separate_window
#define level75 "Buyers Balance"
#define level50 "Balance"
#define level25 "Sellers Balance"
#property indicator_minimum 0
#property indicator_maximum 100
#property indicator_levelcolor DimGray
#property indicator_levelstyle 2 
#property indicator_levelwidth 1
#property indicator_level1 75// + level75
#property indicator_level2 50// + level50
#property indicator_level3 25// + level25

#property indicator_buffers 2
#property indicator_color1 Yellow
#property indicator_color2 EMPTY
//---- input parameters
extern int KPeriod=24;
extern int DPeriod=1;
extern int Slowing=1;
//---- buffers
double MainBuffer[];
double SignalBuffer[];
double HighesBuffer[];
double LowesBuffer[];
//----
int draw_begin1=0;
int draw_begin2=0;

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//-----
   getPeriod();
//-----
   string short_name;
//---- 2 additional buffers are used for counting.
   IndicatorBuffers(4);
   SetIndexBuffer(2, HighesBuffer);
   SetIndexBuffer(3, LowesBuffer);
//---- indicator lines
   SetIndexStyle(0,DRAW_HISTOGRAM);
   SetIndexBuffer(0, MainBuffer);
   SetIndexStyle(1,DRAW_HISTOGRAM);
   SetIndexBuffer(1, SignalBuffer);
//---- name for DataWindow and indicator subwindow label
   if(Period()>PERIOD_H4) { short_name="Error: Stoch_H8 works only below PERIOD_D1 ";}
   else
   short_name="Stoch_H8("+KPeriod+","+DPeriod+","+Slowing+") " ;
   IndicatorShortName(short_name);
   SetIndexLabel(0,short_name);
   SetIndexLabel(1,"Signal_H8");
//----
   draw_begin1=KPeriod+Slowing;
   draw_begin2=draw_begin1+DPeriod;
   SetIndexDrawBegin(0,draw_begin1);
   SetIndexDrawBegin(1,draw_begin2);
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Stochastic oscillator                                            |
//+------------------------------------------------------------------+
int start()
  {
   int    i,k;
   int    counted_bars=IndicatorCounted();
   double price;
//----
   if(Bars<=draw_begin2) return(0);
//---- initial zero
   if(counted_bars<1)
     {
      for(i=1;i<=draw_begin1;i++) MainBuffer[Bars-i]=0;
      for(i=1;i<=draw_begin2;i++) SignalBuffer[Bars-i]=0;
     }
//---- minimums counting
   i=Bars-KPeriod;
   if(counted_bars>KPeriod) i=Bars-counted_bars-1;
   while(i>=0)
     {
      double min=1000000;
      k=i+KPeriod-1;
      while(k>=i)
        {
         price=Low[k];
         if(min>price) min=price;
         k--;
        }
      LowesBuffer[i]=min;
      i--;
     }
//---- maximums counting
   i=Bars-KPeriod;
   if(counted_bars>KPeriod) i=Bars-counted_bars-1;
   while(i>=0)
     {
      double max=-1000000;
      k=i+KPeriod-1;
      while(k>=i)
        {
         price=High[k];
         if(max<price) max=price;
         k--;
        }
      HighesBuffer[i]=max;
      i--;
     }
//---- %K line
   i=Bars-draw_begin1;
   if(counted_bars>draw_begin1) i=Bars-counted_bars-1;
   while(i>=0)
     {
      double sumlow=0.0;
      double sumhigh=0.0;
      for(k=(i+Slowing-1);k>=i;k--)
        {
         sumlow+=Close[k]-LowesBuffer[k];
         sumhigh+=HighesBuffer[k]-LowesBuffer[k];
        }
      if(sumhigh==0.0) MainBuffer[i]=100.0;
      else MainBuffer[i]=sumlow/sumhigh*100;
      i--;
     }
//---- last counted bar will be recounted
   if(counted_bars>0) counted_bars--;
   int limit=Bars-counted_bars;
//---- signal line is simple movimg average
   for(i=0; i<limit; i++)
      SignalBuffer[i]=iMAOnArray(MainBuffer,Bars,DPeriod,0,MODE_SMA,i);
//----

   return(0);
  }
//+------------------------------------------------------------------+
void getPeriod(){
  switch (Period()){
    case (PERIOD_M1): KPeriod=480; return;
    case (PERIOD_M5): KPeriod=96;return;
    case (PERIOD_M15): KPeriod=32;return; 
    case (PERIOD_M30): KPeriod=16;return; 
    case (PERIOD_H1): KPeriod=8;return; 
    case (PERIOD_H4): KPeriod=2;return; 
    case (PERIOD_D1) : KPeriod=0;return; 
    case (PERIOD_W1) : KPeriod=0;return; 
    case (PERIOD_MN1) : KPeriod=0;return; 
  }
}