//+------------------------------------------------------------------+
//|                                              Doda-Stochastic.mq4 |
//|                             Copyright © 2010, Gopal Krishan Doda |
//|                                        http://www.DodaCharts.com |
//|                                     http://www.InvestmentKit.com |
//|This is version 1.0 of Doda-Stochastic indicator                  |
//|Last Modified on 08-Mar-2011                                      |
//| I'm not the original coder. Just modified for screen alert.      |
//+------------------------------------------------------------------+
#include <stdlib.mqh>

// This was converted using YouSky's MT3 to MT4 translator.  I cannot take credit for the code.//

#property indicator_separate_window
#property indicator_minimum 0.00
#property indicator_maximum 100.00
#property indicator_color1 Lime
#property indicator_buffers 2
#property indicator_color2 Red
#property indicator_level1 20
#property indicator_level2 80

//+------------------------------------------------------------------+
//| Common External variables                                        |
//+------------------------------------------------------------------+

//+------------------------------------------------------------------+
//| External variables                                               |
//+------------------------------------------------------------------+
extern double Slw = 8;
extern double Pds = 13;
extern double Slwsignal= 9;
extern int    Barcount = 2000;

//+------------------------------------------------------------------+
//| Special Convertion Functions                                     |
//+------------------------------------------------------------------+

int LastTradeTime;
double ExtHistoBuffer[];
double ExtHistoBuffer2[];
bool BuyAlert=false,SellAlert=false;
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void SetLoopCount(int loops)
  {
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void SetIndexValue(int shift,double value)
  {
   ExtHistoBuffer[shift]=value;
//  Print ("ExtHistoBuffer :" ,value);    // green
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
void SetIndexValue2(int shift,double value)
  {
   ExtHistoBuffer2[shift]=value;
//  Print ("ExtHistoBuffer2 :" ,value);    // green
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
double GetIndexValue(int shift)
  {
   return(ExtHistoBuffer[shift]);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
double GetIndexValue2(int shift)
  {
   return(ExtHistoBuffer2[shift]);
  }
//+------------------------------------------------------------------+
//| End                                                              |
//+------------------------------------------------------------------+

//+------------------------------------------------------------------+
//| Initialization                                                   |
//+------------------------------------------------------------------+
int init()
  {
   SetIndexStyle(0,DRAW_LINE,STYLE_SOLID);
   SetIndexBuffer(0,ExtHistoBuffer);
   SetIndexStyle(1,DRAW_LINE,STYLE_SOLID);
   SetIndexBuffer(1,ExtHistoBuffer2);
   return(0);
  }
//+------------------------------------------------------------------+
//|                                                                  |
//+------------------------------------------------------------------+
int start()
  {
//+------------------------------------------------------------------+
//| Local variables                                                  |
//+------------------------------------------------------------------+
   double AA = 0;
   double bb = 0;
   double aa1= 0;
   double cnt1=0;
   int shift=0;
   double cnt=0;
   double loopbegin=0;
   double loopbegin2 = 0;
   double loopbegin3 = 0;
   bool first=True;
   double prevbars=0;
   double sum=0;
   double smconst=0;
   double smconst1=0;
   double prev=0;
   double prev1 = 0;
   double prev2 = 0;
   double prev3 = 0;
   double weight = 0;
   double linear = 0;
   double MAValue= 0;
   double MAValue2 = 0;
   double mavalue3 = 0;
   string MAstring = "";
   double MyHigh= 0;
   double MyLow = 0;
   int counter=0;
   double Price=0;
   double Price1=0;
   double tmpDevAA=0;

   SetLoopCount(0);
   smconst=2/(1+Slw);
   smconst1=2/(1+Slwsignal);
   
   if (Bars<Barcount) return(-1);

   loopbegin = loopbegin+1;
   for(shift =Barcount-1;shift >=0;shift --)
     {
      prev=GetIndexValue2(shift+1);
      // Yousky 15/05/2006 - Change to avoid Zero divide exception.
      AA=0;
      tmpDevAA=(High[Highest(NULL,0,MODE_HIGH,shift+Pds,Pds)]-Low[Lowest(NULL,0,MODE_LOW,shift+Pds,Pds)]);

      if(tmpDevAA!=0)
         AA=100*((Close[shift]-Low[Lowest(NULL,0,MODE_LOW,shift+Pds,Pds)])/tmpDevAA);
      // ---
      MAValue2=smconst *(AA-prev)+prev;
      SetIndexValue2(shift,MAValue2);
      loopbegin=loopbegin-1;
     }

   loopbegin2=loopbegin2+1;
   for(shift=Barcount-Pds;shift>=0;shift --)
     {
      MyHigh= -999999;
      MyLow = 99999999;
      for(counter=shift;counter<=Pds+shift;counter++)
        {
         Price=GetIndexValue2(counter);
         if(Price>MyHigh)
            MyHigh=Price;
         if(Pds<=0)
            MyHigh=Price;
         if(Price<MyLow)
            MyLow=Price;
         if(Pds<=0)
            MyLow=Price;
        }

      prev1=GetIndexValue(shift+1);
      aa1=GetIndexValue2(shift);

      // Yousky 15/05/2006 - Change to avoid Zero divide exception.
      bb=0;
      if((MyHigh-MyLow)!=0)
         bb=100*(aa1-MyLow)/(MyHigh-MyLow);
      // ---
      MAValue=smconst *(bb-prev1)+prev1;
      SetIndexValue(shift,MAValue);
      loopbegin2=loopbegin2-1;
     }

//Print (MAValue);  // green

   loopbegin3=loopbegin3+1;
   for(shift=Barcount;shift>=0;shift --)
     {
      prev2=GetIndexValue2(shift+1);
      prev3=GetIndexValue(shift);
      mavalue3=smconst1 *(prev3-prev2)+prev2;

      SetIndexValue2(shift,mavalue3);
      loopbegin3=loopbegin3-1;
     }

   if(ExtHistoBuffer[0]>ExtHistoBuffer2[0] && ExtHistoBuffer[0]<20.1 && ExtHistoBuffer2[0]<20.1 && BuyAlert==False)
     {
      Alert("Doda-Stochastic says Buy  ",Symbol()," at ",Close[0]);
      BuyAlert=True;
      SellAlert=False;
     }

   if(ExtHistoBuffer2[0]>ExtHistoBuffer[0] && ExtHistoBuffer[0]>80.1 && ExtHistoBuffer2[0]>80.1 && SellAlert==False)
     {
      // sell signal
      Alert("Doda-Stochastic says Sell  ",Symbol()," at ",Close[0]);
      BuyAlert=false;
      SellAlert=True;
     }
   return(0);
  }
//+------------------------------------------------------------------+