//+------------------------------------------------------------------+
//|                                                   MACD2Lines.mq4 |
//|                      Copyright © 2008, MetaQuotes Software Corp. |
//|                                        http://www.metaquotes.net |
//+------------------------------------------------------------------+
#property copyright "Copyright © 2008, MetaQuotes Software Corp."
#property link      "http://www.metaquotes.net"

#property indicator_separate_window
#property indicator_buffers 2
#property indicator_color1 Blue
#property indicator_color2 Red
//---- input parameters
extern int       FastEMA=12;
extern int       SlowEMA=26;
extern int       SignalSMA=9;
//---- buffers
double ExtMapBuffer1[];
double ExtMapBuffer2[];
//---- indicator buffers
double ExtSilverBuffer[];
double ExtRedBuffer[];

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- additional buffers are used for counting
   IndicatorBuffers(4);
//---- drawing settings
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,ExtMapBuffer1);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexBuffer(1,ExtMapBuffer2);
//----
   SetIndexDrawBegin(1,SignalSMA);
   IndicatorDigits(5);
//---- indicator buffers mapping
   SetIndexBuffer(0, ExtSilverBuffer);
   SetIndexBuffer(1, ExtRedBuffer);
//---- name for DataWindow and indicator subwindow label
   IndicatorShortName("MACD("+FastEMA+","+SlowEMA+","+SignalSMA+")");
//---- initialization done
   return(0);
  }
//+------------------------------------------------------------------+
//| Moving Averages Convergence/Divergence                           |
//+------------------------------------------------------------------+
int start()
  {
   int limit;
   int counted_bars=IndicatorCounted();
//---- check for possible errors
   if(counted_bars<0) return(-1);
//---- 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++)
      ExtSilverBuffer[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++)
      ExtRedBuffer[i]=iMAOnArray(ExtSilverBuffer,Bars,SignalSMA,0,MODE_SMA,i);
//---- done
   return(0);
  }
//+------------------------------------------------------------------+