//+------------------------------------------------------------------+
//|                                          ZeroLag Stochs_true.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
#property indicator_level1  20
#property indicator_level2  80
#property indicator_buffers 2
#property indicator_color1 Blue
#property indicator_color2 Red
//---- input parameters
extern int KPeriod = 5;
extern int Slowing = 3;
extern int DPeriod = 3;
//---- buffers
double MainBuffer[];
double SignalBuffer[];
double HighesBuffer[];
double LowesBuffer[];
double WorkBuffer1[];
double WorkBuffer2[];
double WorkBuffer3[];
//----
int draw_begin1 = 0;
int draw_begin2 = 0;
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
   string short_name;
//---- 2 additional buffers are used for counting.
   IndicatorBuffers(7);
   SetIndexBuffer(2, HighesBuffer);
   SetIndexBuffer(3, LowesBuffer);
   SetIndexBuffer(4, WorkBuffer1);
   SetIndexBuffer(5, WorkBuffer2);
   SetIndexBuffer(6, WorkBuffer3);        
//---- indicator lines
   SetIndexStyle(0, DRAW_LINE);
   SetIndexBuffer(0, MainBuffer);
   SetIndexStyle(1, DRAW_LINE);
   SetIndexBuffer(1, SignalBuffer);
//---- name for DataWindow and indicator subwindow label
   short_name="ZeroLag Stoch(" + KPeriod + "," + DPeriod + "," + Slowing + ")";
   IndicatorShortName(short_name);
   SetIndexLabel(0, short_name);
   SetIndexLabel(1, "Signal");
//----
   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, EMA;
//----
   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)
     {
       if(!CompareDouble((HighesBuffer[i] - LowesBuffer[i]), 0.0))
           WorkBuffer1[i] = 100*((Close[i] - LowesBuffer[i]) / (HighesBuffer[i] - LowesBuffer[i]));
       i--;
     }
//---- last counted bar will be recounted
   if(counted_bars > 0) 
       counted_bars--;
   int limit = Bars - counted_bars;
//---- main line (%K) is simple movimg average
   for(i = 0; i < limit; i++)
       WorkBuffer2[i] = iMAOnArray(WorkBuffer1, Bars, Slowing, 0, MODE_SMA, i);
   for(i = 0; i < limit; i++)
     {
       EMA = iMAOnArray(WorkBuffer2, Bars, Slowing, 0, MODE_SMA, i);
       MainBuffer[i] = WorkBuffer2[i] + WorkBuffer2[i] - EMA;
     }
//---- signal line (%D) is simple movimg average
   for(i = 0; i < limit; i++)
       WorkBuffer3[i] = iMAOnArray(MainBuffer, Bars, DPeriod, 0, MODE_SMA, i);
   for(i = 0; i < limit; i++)
     {
       EMA = iMAOnArray(WorkBuffer3, Bars, DPeriod, 0, MODE_SMA, i);
       SignalBuffer[i] = WorkBuffer3[i] + WorkBuffer3[i] - EMA;
     }
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Функция сранения двух вещественных чисел.                        |
//+------------------------------------------------------------------+
bool CompareDouble (double Number1, double Number2)
  {
    bool Compare = NormalizeDouble(Number1 - Number2, 8) == 0;
    return(Compare);
  }
//+------------------------------------------------------------------+