Triple Exponential Average

[eSignal_JasonK]

File Name: TripleExponentialAverage.efs

Description:
Triple Exponential Average

Formula Parameters:
Color line null: Green
Length: 9
Gradient Color: 200
Display Title Value: False


Notes:
The Triple Exponential Average (TRIX) indicator is an oscillator used
to identify oversold and overbought markets and it can also be used
as a momentum indicator. As is common with many oscillators, TRIX
oscillates around a zero line. When used as an oscillator, a positive
value indicates an overbought market while a negative value indicates
an oversold market. As a momentum indicator, a positive value suggests
momentum is increasing while a negative value suggests momentum is
decreasing.



Download File:
TripleExponentialAverage.efs



EFS Code:

/*********************************
Provided By:  
    eSignal (Copyright c eSignal), a division of Interactive Data 
    Corporation. 2008. All rights reserved. This sample eSignal 
    Formula Script (EFS) is for educational purposes only and may be 
    modified and saved under a new file name.  eSignal is not responsible
    for the functionality once modified.  eSignal reserves the right 
    to modify and overwrite this EFS file with each new release.
  

Description:        
    Triple Exponential Average 


Version:            1.0  08/08/2008

Notes:
    The Triple Exponential Average (TRIX) indicator is an oscillator used
    to identify oversold and overbought markets and it can also be used
    as a momentum indicator. As is common with many oscillators, TRIX
    oscillates around a zero line. When used as an oscillator, a positive
    value indicates an overbought market while a negative value indicates
    an oversold market. As a momentum indicator, a positive value suggests
    momentum is increasing while a negative value suggests momentum is
    decreasing.



Formula Parameters:                     Default:
    * Color line null                    Green
    * Length                               9
    * Gradient Color                      200
    * Display Title Value                False
**********************************/


var fpArray = new Array();
var bInit = false;
var myTRIX = null;
var Max = 1;
var Min = -1;


function preMain() {

    setPriceStudy(false);
    setShowCursorLabel(false);
    setShowTitleParameters( false );
    
    setStudyTitle("Triple Exponential Average");
    setCursorLabelName("TRIX", 0);
    setCursorLabelName("NULL", 1);

    setDefaultBarFgColor(Color.blue, 0);
    setDefaultBarFgColor(Color.green, 1);
    setPlotType(PLOTTYPE_LINE, 0); 
    setPlotType(PLOTTYPE_LINE, 1); 
    
    setDefaultBarThickness(1, 0);
    setDefaultBarThickness(1, 1);

   
    askForInput();
    var x=0;
    fpArray[x] = new FunctionParameter("LineColor", FunctionParameter.COLOR);
    with(fpArray[x++]){
        setName("Color line null");
        setDefault(Color.green);
    }    

    fpArray[x] = new FunctionParameter("Length", FunctionParameter.NUMBER);
    with(fpArray[x++]){
        setLowerLimit(1);        
        setDefault(9);
    }

    fpArray[x] = new FunctionParameter("ViewValue", FunctionParameter.BOOLEAN);
    with(fpArray[x++]){
       setName("Display Title Value");
       setDefault(false);
    }    

    fpArray[x] = new FunctionParameter("GradientColor", FunctionParameter.NUMBER);
    with(fpArray[x++]){
       setName("Color Gradient");
        addOption(0); 
        addOption(50);
        addOption(100);
        addOption(150);
        addOption(200);
        addOption(250);
        setDefault(200);
    }    
}


function main(LineColor, ViewValue, Length, GradientColor) {
var nmyTRIX;
var nmyTRIX2;
var Rez;
var inc;

   if(getCurrentBarCount() < Length) return;

   if ( bInit == false ) { 
      myTRIX = efsInternal("TRIXLog", close(), Length);
      myTRIX = ema(Length, myTRIX);
      myTRIX = ema(Length, myTRIX);
      myTRIX = ema(Length, myTRIX);
      setDefaultBarFgColor(LineColor, 1);
      bInit = true; 
   } 

   
   nmyTRIX = myTRIX.getValue(0);
   nmyTRIX2 = myTRIX.getValue(-1);

   if (nmyTRIX2 == null) nmyTRIX2 = 0; 

   Rez = (nmyTRIX - nmyTRIX2) * 10000 ;
   inc = Math.round(Rez);
   if (inc > Max) Max = inc;
   if (inc < Min) Min = inc;
   
   inc = RGB_G(inc, Max, Min);
   if (inc == null) inc = 0;
  
   setDefaultBarFgColor(Color.RGB(GradientColor,inc,0),0);

   return new Array (Rez, 0);

}



function TRIXLog(DataArray, Length) {
var tmp;
  tmp = DataArray.getValue(0);
  return (Math.log(tmp));
}

function RGB_G(Val, Max, Min) {
var tmpG = 0;
var Perc1 = 0;
 if (Val > 0) {
    Perc1 = (Val * 100) / Max;
    tmpG = 255 - (Perc1*255)/100;
    return Math.round(tmpG);
 } else {
    Perc1 = ((Val*-1) * 100) / (Min*-1);
    tmpG = 255 - (Perc1*255)/100;
    return Math.round(tmpG);
 }
 return  tmpG;
}