//+------------------------------------------------------------------+
//|                                                   MACD right.mq4 |
//|                      |
//|                                      
//+------------------------------------------------------------------+
#property  copyright ""
#property  link      ""
//---- indicator settings
#property  indicator_separate_window
#property  indicator_buffers 3
#property  indicator_color1  Silver
#property  indicator_color2  SkyBlue
#property  indicator_color3  Red
#property  indicator_width1  2
//---- indicator parameters
extern int FastEMA=12;
extern int SlowEMA=26;
extern int SignalEMA=9;
//---- indicator buffers
double     MacdBuffer[];
double     SignalBuffer[];
double     HistogramBuffer[];

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- drawing settings
   SetIndexStyle(0,DRAW_HISTOGRAM);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexStyle(2,DRAW_LINE);
   SetIndexDrawBegin(1,SignalEMA);
   IndicatorDigits(Digits+1);
//---- indicator buffers mapping
   SetIndexBuffer(2,MacdBuffer);
   SetIndexBuffer(1,SignalBuffer);
   SetIndexBuffer(0,HistogramBuffer);
//---- name for DataWindow and indicator subwindow label
   IndicatorShortName("MACD("+FastEMA+","+SlowEMA+","+SignalEMA+")");
   SetIndexLabel(2,"MACD");
   SetIndexLabel(1,"Signal");
//---- initialization done
   return(0);
  }
//+------------------------------------------------------------------+
//| Moving Averages Convergence/Divergence                           |
//+------------------------------------------------------------------+
int start()
  {
   int limit;
   int counted_bars=IndicatorCounted();
//---- last counted bar will be recounted
   if(counted_bars>0) counted_bars--;
   limit=Bars-counted_bars;

//---- macd counted in the 1-st buffer
   for(int i=0; i<limit; i++)
      MacdBuffer[i]=iMA(NULL,0,FastEMA,0,MODE_EMA,PRICE_CLOSE,i)-iMA(NULL,0,SlowEMA,0,MODE_EMA,PRICE_CLOSE,i);

//---- signal line counted in the 2-nd buffer
   for(i=0; i<limit; i++)
      SignalBuffer[i]=iMAOnArray(MacdBuffer,Bars,SignalEMA,0,MODE_EMA,i);  

//---- histogram counted in the 3rd buffer
   for (i=0; i<limit; i++)   
      HistogramBuffer[i]= MacdBuffer[i] - SignalBuffer[i];     

//---- done
   return(0);
  }
//+------------------------------------------------------------------+