This chart-line indicator should be simple

//+------------------------------------------------------------------+
//|                                               High Low Shift.mq4 |
//|                                 Copyright 2013, Nondisclosure007 |
//|                                               http://no.link.yet |
//+------------------------------------------------------------------+
#property copyright "Copyright 2013, Nondisclosure007"
#property link      "http://no.link.yet"

#property indicator_chart_window
#property indicator_buffers 2
#property indicator_color1 Blue
#property indicator_color2 Red

extern int intDistance=8;

double UpBuffer[], DownBuffer[];
//+------------------------------------------------------------------+
//| Custom indicator initialization function                         |
//+------------------------------------------------------------------+
int init()
  {
//---- indicators
   SetIndexStyle(0,DRAW_LINE);
   SetIndexBuffer(0,UpBuffer);
   SetIndexStyle(1,DRAW_LINE);
   SetIndexBuffer(1,DownBuffer);

//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator deinitialization function                       |
//+------------------------------------------------------------------+
int deinit()
  {
//----
   
//----
   return(0);
  }
//+------------------------------------------------------------------+
//| Custom indicator iteration function                              |
//+------------------------------------------------------------------+
int start()
  {
   int    counted_bars=IndicatorCounted(); int limit; 
   if(counted_bars<0) return(-1); 
   if(counted_bars>0) counted_bars--;   
   limit=Bars-counted_bars;
   for(int shift=0; shift<limit; shift++)
   {
      UpBuffer[shift]=High[iHighest(NULL,0,MODE_HIGH,intDistance,shift+1)];
      DownBuffer[shift]=Low[iLowest(NULL,0,MODE_LOW,intDistance,shift+1)];
   }
   return(0);
  }
//+------------------------------------------------------------------+

Quoting FerruFx

Disliked

Why reinventing the wheel You should find dozens of indicators doing the exact same thing here on FF ...

Ignored

Quoting nondisclosure00

Disliked

I'm looking to draw lines on a chart that refernce the high and low for the period outside of the london session (8-5 gmt0). So, during the hours, the lines shouldn't change. I'm including an indicator that I did that will calculate every new candle based on how many candles you want to go back. But I can't seem to figure out how to carry a value over w/out re-calculating. //+------------------------------------------------------------------+ //| High Low Shift.mq4 | //| Copyright 2013, Nondisclosure007 | //| http://no.link.yet | //+------------------------------------------------------------------+...

Ignored