Stop and Reverse ATR Trailing Stop

[James 88]

I've a stop and reverse study and would like to write it into efs.

It's similar to Parabolic SAR stop and reverse in nature but ulitizing a simple ATR trailing stop; 2.5 multiples of 5 ATR below the high, then when tripped by price it reverses and becomes the short stop above the lows.

Can anyone help? Point me in the right direction?

Rgds, James

function init()
{
  setTitle("Trailing Stop 1");

  setSeriesColour(0, Colour.Yellow);
  setSeriesLineStyle(0, Pen.Solid);
  setRange(Range.Parent);
}

function getGraph(share, data)
{
  var trail = new Array();
  var at = 5; //ATR periods
  var mult = 2.5; //ATR multiplier (smaller number = tighter stop)
  var a_ma = new MA(at, MA.Simple);
  var tr = new Array();
  var tra = new Array();
  var upper, lower, hi, lo;
  var test = new Array();

  trail[0] = data[0].close;
  for (var i=1; i<data.length; i++)
  {
    hi = Math.max(data[i].high,data[i-1].close);
    lo = Math.min(data[i].low,data[i-1].close);
    tr[i] = hi - lo;
    tra[i] = a_ma.getNext(tr[i]);
    upper = data[i].low + mult*tra[i];
    lower = data[i].high - mult*tra[i];
    test[i] = lower;
    if (data[i].high > trail[i-1] && data[i-1].high < trail[i-2]) trail[i] = lower;
    else if (trail[i-1] > data[i].low && trail[i-2] < data[i-1].low) trail[i] = upper;
    else if (data[i].low < trail[i-1]) trail[i] = Math.min(trail[i-1],upper);
    else if (data[i].high > trail[i-1]) trail[i] = Math.max(trail[i-1],lower);
    else trail[i] = trail[i-1];    
  }
  return trail;//trail;
} 

[James 88]

I've written the formula below. It's based off the code in my previous post. I've been studing the tutorials but (not surprizingly) there seem an error or two. I'm not sure if I can just call the "high" "low" or need to getValue first. Could anyone run an eye over it?? I'm trying to achieve a Stop and Reverse Trailing stop based off 2x5periodATR above/below the low/high.

function preMain() {
    setPriceStudy(true);
    setStudyTitle("SAR");
    setCursorLabelName("VStop", 0);
    setDefaultBarThickness(1, 0);
    setDefaultBarFgColor(Color.yellow, 0);
    
    setShowTitleParameters(false);
    
    // Formula Parameters
    var fp1 = new FunctionParameter("nATRlen", FunctionParameter.NUMBER);
        fp1.setName("ATR Periods");
        fp1.setLowerLimit(1);
        fp1.setDefault(5);
}

var bEdit = true;
var vATR = null;

function main(nATRlen) {
    if (bEdit == true) {
        vATR = new ATRStudy(nATRlen);
        bEdit = false;
    }
    
    var nState = getBarState();
    if (nState == BARSTATE_NEWBAR) {
    }
    
    var ATR = vATR.getValue(ATRStudy.ATR);
    if (ATR == null) return;
    
    var low = low();
    var high = high();
    
    var trail[0] = close[0];
    for (var i = 1; i < length; i++) {
    upper = low + 2*vATR[i];
    lower = high - 2*vATR[i];
    test[i] = lower;
    if (high[i] > trail[i-1] && high[i-1] < trail[i-2]) trail[i] = lower;
    else if (trail[i-1] > low[i] && trail[i-2] < low[i-1]) trail[i] = upper;
    else if (low[i] < trail[i-1]) trail[i] = Math.min(trail[i-1],upper);
    else if (high[i] > trail[i-1]) trail[i] = Math.max(trail[i-1],lower);
    else trail[i] = trail[i-1];
}
    
    return trail;
}