//+------------------------------------------------------------------+
//|                                                  Custom MACD.mq4 |
//|                   Copyright 2005-2014, MetaQuotes Software Corp. |
//|                                              http://www.mql4.com |
//+------------------------------------------------------------------+
#property copyright   "2005-2014, MetaQuotes Software Corp."
#property link        "http://www.mql4.com"
#property description "Moving Averages Convergence/Divergence"
#property strict

//--- indicator settings
#property  indicator_separate_window
#property  indicator_buffers 4
#property  indicator_color1  Silver
#property  indicator_width1  2
#property  indicator_color2  Orange
#property  indicator_width2  2
#property  indicator_color3  Red
#property  indicator_width3  2
#property  indicator_color4  DodgerBlue
#property  indicator_width4  2
//--- indicator parameters
input int InpFastEMA=12;   // Fast EMA Period
input int InpSlowEMA=26;   // Slow EMA Period
input int InpSignalSMA=9;  // Signal SMA Period
input int InpEMA01=8;      // EMA01
input int InpEMA02=38;     // EMA02
//--- indicator buffers
double    ExtMacdBuffer[];
double    ExtSignalBuffer[];
double    ExtEMA01Buffer[];
double    ExtEMA02Buffer[];
//--- right input parameters flag
bool      ExtParameters=false;

//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit(void)
  {
   IndicatorDigits(Digits+1);
//--- drawing settings
   SetIndexStyle(0,DRAW_HISTOGRAM);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexDrawBegin(1,InpSignalSMA);
   SetIndexStyle(2,DRAW_LINE);
   SetIndexDrawBegin(2,InpEMA01);
   SetIndexStyle(3,DRAW_LINE);
   SetIndexDrawBegin(3,InpEMA02);
//--- indicator buffers mapping
   SetIndexBuffer(0,ExtMacdBuffer);
   SetIndexBuffer(1,ExtSignalBuffer);
   SetIndexBuffer(2,ExtEMA01Buffer);
   SetIndexBuffer(3,ExtEMA02Buffer);
//--- name for DataWindow and indicator subwindow label
   IndicatorShortName("MACD with 2 EMAs("+IntegerToString(InpFastEMA)+","+IntegerToString(InpSlowEMA)+","+IntegerToString(InpSignalSMA)+"|EMA01 "+IntegerToString(InpEMA01)+"|EMA02 "+IntegerToString(InpEMA02)+")");
   SetIndexLabel(0,"MACD");
   SetIndexLabel(1,"Signal");
   SetIndexLabel(2,"EMA01");
   SetIndexLabel(3,"EMA02");
//--- check for input parameters
   if(InpFastEMA<=1 || InpSlowEMA<=1 || InpSignalSMA<=1 || InpFastEMA>=InpSlowEMA)
     {
      Print("Wrong input parameters");
      ExtParameters=false;
      return(INIT_FAILED);
     }
   else
      ExtParameters=true;
//--- initialization done
   return(INIT_SUCCEEDED);
  }
//+------------------------------------------------------------------+
//| Moving Averages Convergence/Divergence                           |
//+------------------------------------------------------------------+
int OnCalculate (const int rates_total,
                 const int prev_calculated,
                 const datetime& time[],
                 const double& open[],
                 const double& high[],
                 const double& low[],
                 const double& close[],
                 const long& tick_volume[],
                 const long& volume[],
                 const int& spread[])
{
   int i,limit=fmin(rates_total-prev_calculated+1,rates_total-1); 
//--- macd counted in the 1-st buffer
   for(i=limit;i>=0 && !_StopFlag; i--)
   {
      ExtMacdBuffer[i]=iMA(NULL,0,InpFastEMA,0,MODE_EMA,PRICE_CLOSE,i)-
                       iMA(NULL,0,InpSlowEMA,0,MODE_EMA,PRICE_CLOSE,i);
   }
//--- signal line counted in the 2-nd buffer
   for(i=limit;i>=0 && !_StopFlag; i--) ExtSignalBuffer[i] = iMAOnArray(ExtMacdBuffer,0,InpSignalSMA,0,MODE_SMA,i);
//--- EMA01 line counted in the 3-rd buffer   
   for(i=limit;i>=0 && !_StopFlag; i--) ExtEMA01Buffer[i]  = iMAOnArray(ExtMacdBuffer,0,InpEMA01,0,MODE_LWMA,i);
//--- EMA02 line counted in the 4-th buffer   
   for(i=limit;i>=0 && !_StopFlag; i--) ExtEMA02Buffer[i]  = iMAOnArray(ExtMacdBuffer,0,InpEMA02,0,MODE_LWMA,i);
//--- done
   return(rates_total);
  }
//+------------------------------------------------------------------+