//+------------------------------------------------------------------+
//|                                                      comment.mq4 |
//|                        Copyright 2017, MetaQuotes Software Corp. |
//|                                             https://www.mql5.com |
//+------------------------------------------------------------------+
#property copyright "Copyright 2017, MetaQuotes Software Corp."
#property link      "https://www.mql5.com"
#property version   "1.00"
#property strict
#property indicator_chart_window
#property indicator_buffers 2;

double BufUP_Arrow[];
double BufDOWN_Arrow[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int OnInit()
{
   
SetIndexBuffer(0,BufUP_Arrow);
SetIndexStyle(0,DRAW_ARROW,EMPTY,1,Blue);
SetIndexArrow(0,233);

SetIndexBuffer(1,BufDOWN_Arrow);
SetIndexStyle(1,DRAW_ARROW,EMPTY,1,Blue);
SetIndexArrow(1,234);

   
   return(INIT_SUCCEEDED);
}

int start()
{

int limit = Bars - IndicatorCounted();

for(int i=0; i<limit; i++)
{

BufUP_Arrow[i] = EMPTY_VALUE;
BufDOWN_Arrow[i] = EMPTY_VALUE;

if(Close[i] > Open[i])
{
BufUP_Arrow[i] = Low[i];
}
if(Close[i] < Open[i])
{
BufDOWN_Arrow[i] = High[i];
}

}

return(0);
}