//+------------------------------------------------------------------+
//|                                          NeutralHedge osc_v1.mq4 |
//|                                            © 2008.07.02 SwingMan |
//|                                                                  |
//+------------------------------------------------------------------+
#property copyright "© 2008.07.02 SwingMan"
#property link      ""
// source code:
//+------------------------------------------------------------------+
//|                                       OverLay Chart.mq4 Ver.1.10 |
//|                                      Copyright© 2006-2007 S.B.T. |
//|                                     http://sufx.core.t3-ism.net/ |
//+------------------- DO NOT REMOVE THIS HEADER --------------------+
//|  This script is free to use/distribute/modify and re-distribute. |
//|                                  (Limited to noncommercial use.) |
//+------------------------------------------------------------------+
// changes:
//+------------------------------------------------------------------+
// - fewhills  / 2008.07.02
// I have modified the indicator with 2 extra parameters: starting time and TF period.
// The time parameter is the usual MT4 method: yyyy.mm.dd hh:mm
// The TF period is default at 1 Hr TF = 60 
//+------------------------------------------------------------------+
// - SwingMan / 2008.07.02
// draw histogram of ratios
//+------------------------------------------------------------------+

#property indicator_separate_window
#property indicator_buffers 2

#property indicator_color1 MediumSeaGreen
#property indicator_color2 Tomato

#property indicator_level1 0
#property indicator_levelcolor Gray
#property indicator_levelstyle STYLE_SOLID

//---- inputs --------------------------------------------------------
extern string SubSymbol = "EURUSD";
extern string StartingTimeCorr = "2008.07.01 00:00";
extern int    TFperiod         = 60;
extern double threshold = 70;
extern color threshold_color = Magenta;
extern bool Mirroring = true;
//--------------------------------------------------------------------

string sWinName = "NeutralHedge osc_v1";

//Indicator Buffers
double ExtMapBuffer1[];
double ExtMapBuffer2[];

//-- variables
double dPoint;
int iWindow = 1;

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
{
   dPoint = MarketInfo(Symbol(), MODE_POINT);   
      
   sWinName = sWinName + " (" + Symbol() + "-" + SubSymbol + ") ";
   IndicatorShortName(sWinName);   
   
   SetIndexBuffer( 0, ExtMapBuffer1 );
   SetIndexBuffer( 1, ExtMapBuffer2 );

   SetIndexStyle( 0, DRAW_HISTOGRAM, STYLE_SOLID, 2);
   SetIndexStyle( 1, DRAW_HISTOGRAM, STYLE_SOLID, 2);
   
   SetIndexEmptyValue( 0, 0.0 );
   SetIndexEmptyValue( 1, 0.0 );

   SetIndexLabel( 0, "BUY -" +Symbol() );
   SetIndexLabel( 1, "SELL-" +Symbol() );
      
   IndicatorDigits(Digits);
   
   Draw_ThresholdLines();
   
   return(0);
}


//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
{  
   return(0);
}

//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
{
   int _BarsCount;
   double _CurRangeHigh, _CurRangeLow, _CurRangeCenter, _CurClose;
   double _SubRangeHigh, _SubRangeLow, _SubRangeCenter;
   double _SubPoint, _SubDigit;
   double _SubOpen, _SubHigh, _SubLow, _SubClose;
   double _PipsRatio;
   double _GridPips, _GridPrice;
   int _i;

   int firstBar = iBarShift(NULL,TFperiod,StrToTime(StartingTimeCorr),true);
   if (firstBar <0 )
   {
      Alert("StartingTimeCorr seems to be wrong."); return (0);
   }
       
   //-- Initialize Buffers
	RefreshRates();
   ArrayInitialize( ExtMapBuffer1, 0.0 );
   ArrayInitialize( ExtMapBuffer2, 0.0 );

   //-- Calculate Visible Bars
   _BarsCount = WindowBarsPerChart() + 1;
   int _FirstBar = firstBar; // WindowFirstVisibleBar();
   int _LastBar = _FirstBar - _BarsCount + 1;
   if ( _LastBar < 0 ) {
      _LastBar = 0;
      _BarsCount = _FirstBar + 1;
   }


   //-- Calculate Chart Ratio
   _CurRangeHigh = High[Highest(Symbol(), 0, MODE_HIGH, _BarsCount, _LastBar)];
   _CurRangeLow  = Low[Lowest(Symbol(), 0, MODE_LOW, _BarsCount, _LastBar)];
   _CurRangeCenter = ( _CurRangeHigh + _CurRangeLow ) * 0.5;
      
   if ( Mirroring ) {
      _SubRangeHigh = iLow( SubSymbol, 0, Lowest( SubSymbol, 0, MODE_LOW, _BarsCount, _LastBar ) );
      _SubRangeLow  = iHigh( SubSymbol, 0, Highest( SubSymbol, 0, MODE_HIGH, _BarsCount, _LastBar ) );
   } else {
      _SubRangeHigh = iHigh( SubSymbol, 0, Highest( SubSymbol, 0, MODE_HIGH, _BarsCount, _LastBar ) );
      _SubRangeLow  = iLow( SubSymbol, 0, Lowest( SubSymbol, 0, MODE_LOW, _BarsCount, _LastBar ) );
   }

   _SubRangeCenter = ( _SubRangeHigh + _SubRangeLow ) * 0.5;
   _SubPoint = MarketInfo( SubSymbol, MODE_POINT );
   _SubDigit = MarketInfo( SubSymbol, MODE_DIGITS );

   _PipsRatio = ( _CurRangeHigh - _CurRangeLow )  / ( _SubRangeHigh - _SubRangeLow );

   //-- Draw ratio
	for ( _i = _LastBar; _i < _LastBar + _BarsCount; _i ++ ) {
      _SubClose = iClose( SubSymbol, 0, _i ) - _SubRangeCenter;      

      double Close_Sub = _CurRangeCenter + _SubClose * _PipsRatio;     
      double Close_Main = iClose(Symbol(), 0, _i);
      double range = (Close_Main - Close_Sub) / dPoint;      
      range = NormalizeDouble(range,0);
      
      if (range > 0) 
        ExtMapBuffer2[_i] = range; 
      else 
        ExtMapBuffer1[_i] = range;
   } 
//----
   return(0);
}
//+------------------------------------------------------------------+

void Draw_ThresholdLines()
{
   iWindow = WindowFind(sWinName);
   Draw_Line("threshLineUp",  threshold, threshold_color);
   Draw_Line("threshLineDn", -threshold, threshold_color);
   return;
}

void Draw_Line(string sName, double value, color iColor)
{   
   ObjectCreate(sName, OBJ_HLINE, iWindow, 0, value);
   ObjectSet(sName, OBJPROP_COLOR, iColor);
   ObjectSet(sName, OBJPROP_STYLE, STYLE_SOLID);
   ObjectSet(sName, OBJPROP_TIME1, 0);
   ObjectSet(sName, OBJPROP_PRICE1, value);
   return;
}