//+------------------------------------------------------------------+
//|                                               AC(AM)             | 
//+------------------------------------------------------------------+
#property  copyright "Andrey Matvievskiy"
#property  link      ""
//---- indicator settings
#property  indicator_separate_window
#property  indicator_buffers 3
#property  indicator_color1  Black
#property  indicator_color2  Green
#property  indicator_color3  Red

extern int PeriodMA1 = 34;
extern int PeriodMA2 = 5;
extern int PeriodMA3 = 5;
extern int TypeMA1 = 0;
extern int TypeMA2 = 0;
extern int TypeMA3 = 0;
extern int PriceMA1 = 4;
extern int PriceMA2 = 4;
extern int TF1 = 0;
extern int TF2 = 0;
extern int Shift1 = 0;
extern int Shift2 = 0;
extern int Shift3 = 0;
//---- indicator buffers
double     ExtBuffer0[];
double     ExtBuffer1[];
double     ExtBuffer2[];
double     ExtBuffer3[];
double     ExtBuffer4[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- 2 additional buffers are used for counting.
   IndicatorBuffers(5);
//---- drawing settings
   SetIndexStyle(0,DRAW_NONE);
   SetIndexStyle(1,DRAW_HISTOGRAM);
   SetIndexStyle(2,DRAW_HISTOGRAM);
   IndicatorDigits(Digits+2);
   SetIndexDrawBegin(0,38);
   SetIndexDrawBegin(1,38);
   SetIndexDrawBegin(2,38);
//---- 4 indicator buffers mapping
   SetIndexBuffer(0,ExtBuffer0);
   SetIndexBuffer(1,ExtBuffer1);
   SetIndexBuffer(2,ExtBuffer2);
   SetIndexBuffer(3,ExtBuffer3);
   SetIndexBuffer(4,ExtBuffer4);
//---- name for DataWindow and indicator subwindow label
   IndicatorShortName("AC (AM)");
   SetIndexLabel(1,NULL);
   SetIndexLabel(2,NULL);
//---- initialization done
   return(0);
  }
//+------------------------------------------------------------------+
//| Accelerator/Decelerator Oscillator                               |
//+------------------------------------------------------------------+
int start()
  {
   int    limit;
   int    counted_bars=IndicatorCounted();
   double prev,current;
   //---- last counted bar will be recounted
   if(counted_bars>0) counted_bars--;
   limit=Bars-counted_bars;
   if(counted_bars==0) limit-=2;
   //---- macd counted in the 1-st additional buffer
   for(int i=0; i<limit; i++)
      ExtBuffer3[i]=iMA(NULL,TF2,PeriodMA2,Shift2,TypeMA2,PriceMA2,i)-iMA(NULL,TF1,PeriodMA1,Shift1,TypeMA1,PriceMA1,i);
   //---- signal line counted in the 2-nd additional buffer
   for(i=0; i<limit; i++)
      ExtBuffer4[i]=iMAOnArray(ExtBuffer3,Bars,PeriodMA3,Shift3,TypeMA3,i);
   //---- dispatch values between 2 buffers
   bool up=true;
   for(i=limit-1; i>=0; i--)
     {
      current=ExtBuffer3[i]-ExtBuffer4[i];
      prev=ExtBuffer3[i+1]-ExtBuffer4[i+1];
      if(current>prev) up=true;
      if(current<prev) up=false;
      if(!up)
        {
         ExtBuffer2[i]=current;
         ExtBuffer1[i]=0.0;
        }
      else
        {
         ExtBuffer1[i]=current;
         ExtBuffer2[i]=0.0;
        }
       ExtBuffer0[i]=current;
     }
   //---- done
   return(0);
  }
//+------------------------------------------------------------------+