#property indicator_chart_window
#property indicator_buffers 3
#property indicator_plots 2
#property indicator_color1 clrBlue
#property indicator_color2 clrRed
#property indicator_width1 1
#property indicator_width2 1

double dUpBuffer[];
double dDownBuffer[];
double dTrendBuffer[];

extern int MA_Period = 20;
extern ENUM_MA_METHOD MA_Method_1 = MODE_SMA;
extern ENUM_MA_METHOD MA_Method_2 = MODE_SMA;
extern ENUM_APPLIED_PRICE MA_Price_1 = PRICE_HIGH;
extern ENUM_APPLIED_PRICE MA_Price_2 = PRICE_LOW;
 
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
{
   IndicatorBuffers(3);

   //---- indicator buffers mapping  
   SetIndexBuffer(0, dUpBuffer);
   SetIndexBuffer(1, dDownBuffer);
   SetIndexBuffer(2, dTrendBuffer);

   //---- drawing settings
   SetIndexStyle(0, DRAW_ARROW);
   SetIndexArrow(0, 233); //241 option for different arrow head
   SetIndexStyle(1, DRAW_ARROW);
   SetIndexArrow(1, 234); //242 option for different arrow head
   
   //----
   SetIndexEmptyValue(0, EMPTY_VALUE);
   SetIndexEmptyValue(1, EMPTY_VALUE);
   SetIndexEmptyValue(2, EMPTY_VALUE);

   //---- name for DataWindow
   SetIndexLabel(0, "Up");
   SetIndexLabel(1, "Down");
   
   SetIndexDrawBegin(0, MA_Period - 1);
   SetIndexDrawBegin(1, MA_Period - 1);
   
   IndicatorShortName("MA Arrows (" + MA_Period + ")");
   
   return(0);
}

//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
{
   int counted_bars = IndicatorCounted();
   int limit = Bars - counted_bars - 1;
   if (limit > Bars - MA_Period) limit = Bars - MA_Period;
   
   double spread = MarketInfo(Symbol(), MODE_SPREAD) * MarketInfo(Symbol(), MODE_POINT);

   for (int i = limit; i >= 1; i--)
   {
      double myMA1 = iMA(NULL, 0, MA_Period, 0, MA_Method_1, MA_Price_1, i);
      double myMA2 = iMA(NULL, 0, MA_Period, 0, MA_Method_2, MA_Price_2, i);
      
      if (Close[i] > myMA1) dTrendBuffer[i] = 1;
      else if (Close[i] < myMA2) dTrendBuffer[i] = 2;

      if ((dTrendBuffer[i + 1] != 1) && (dTrendBuffer[i] == 1)) dUpBuffer[i] = High[i] + 2 * spread;
      if ((dTrendBuffer[i + 1] != 2) && (dTrendBuffer[i] == 2)) dDownBuffer[i] = Low[i] - 2 * spread;
   }

   return(0);
}