//+------------------------------------------------------------------+
//|                                        ZeroLag MACD-OsMA(AM).mq4 |
//|                                               Andrey Matvievskiy |
//|                                                                  |
//+------------------------------------------------------------------+
#property copyright "Andrey Matvievskiy"
#property link      ""

//---- indicator settings
#property  indicator_separate_window
#property  indicator_buffers 7
#property  indicator_color1  Black
#property  indicator_color2  Black
#property  indicator_color3  Teal
#property  indicator_color4  Red
#property  indicator_color5  Teal
#property  indicator_color6  Red
#property  indicator_color7  Black

extern int FastEMA = 12;
extern int SlowEMA = 24;
extern int SignalEMA = 9;

//---- indicator buffers
double     ExtBuffer0[];
double     ExtBuffer1[];
double     ExtBuffer2[];
double     ExtBuffer3[];
double     ExtBuffer4[];
double     ExtBuffer5[];
double     ExtBuffer6[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- 2 additional buffers are used for counting.
   IndicatorBuffers(7);
//---- drawing settings
   
   SetIndexStyle(0,DRAW_NONE);
   SetIndexStyle(1,DRAW_NONE);
   SetIndexStyle(2,DRAW_HISTOGRAM,0,2);
   SetIndexStyle(3,DRAW_HISTOGRAM,0,2);
   SetIndexStyle(4,DRAW_HISTOGRAM,0,1);
   SetIndexStyle(5,DRAW_HISTOGRAM,0,1);
   SetIndexStyle(6,DRAW_NONE);
   IndicatorDigits(Digits+2);
     
//---- 4 indicator buffers mapping
   SetIndexBuffer(0,ExtBuffer0);
   SetIndexBuffer(1,ExtBuffer1);
   SetIndexBuffer(2,ExtBuffer2);
   SetIndexBuffer(3,ExtBuffer3);
   SetIndexBuffer(4,ExtBuffer4);
   SetIndexBuffer(5,ExtBuffer5);
   SetIndexBuffer(6,ExtBuffer6);
   
//---- name for DataWindow and indicator subwindow label
   IndicatorShortName("ZeroLag MACD-OsMA(AM)("+FastEMA+","+SlowEMA+","+SignalEMA+")");
   
   SetIndexLabel(0,NULL);
   SetIndexLabel(1,NULL);
   SetIndexLabel(2,NULL);
   SetIndexLabel(3,NULL);
 
//---- initialization done
   return(0);
  }
//+------------------------------------------------------------------+
//| Accelerator/Decelerator Oscillator                               |
//+------------------------------------------------------------------+
int start()
  {
   int    limit;
   int    counted_bars=IndicatorCounted();
   double prev1,current1,prev2,current2;
   limit=Bars-counted_bars;
   if(counted_bars==0) limit--;
      for(int i=0; i<limit; i++)
      ExtBuffer0[i]=iCustom(NULL,0,"ZeroLag MACD",FastEMA,SlowEMA,SignalEMA,0,i);
      for(i=0; i<limit; i++)
      ExtBuffer1[i]=iCustom(NULL,0,"ZeroLag MACD",FastEMA,SlowEMA,SignalEMA,1,i);   
      bool up1=true;
      bool up2=true;
      for(i=limit-1; i>=0; i--)
     {
     
      current1=ExtBuffer0[i];
      prev1=ExtBuffer0[i+1];
      if(current1>prev1) up1=true;
      if(current1<prev1) up1=false;
      if(!up1)
        {
         ExtBuffer5[i]=current1;
         ExtBuffer4[i]=0.0;
        }
      else
        {
         ExtBuffer4[i]=current1;
         ExtBuffer5[i]=0.0;
        }
     
      current2=ExtBuffer0[i]-ExtBuffer1[i];
      prev2=ExtBuffer0[i+1]-ExtBuffer1[i+1];
      if(current2>prev2) up2=true;
      if(current2<prev2) up2=false;
      if(!up2)
        {
         ExtBuffer3[i]=current2;
         ExtBuffer2[i]=0.0;
        }
      else
        {
         ExtBuffer2[i]=current2;
         ExtBuffer3[i]=0.0;
        }
         ExtBuffer6[i]=current2;
     }    

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