/*********************************************************
Alexis C. Montenegro © March 2006                         
Use and/or modify this code freely. If you redistribute it
please include this and/or any other comment blocks and a 
description of any changes you make.                      
**********************************************************/

// NOTE:                                                                          
// This efs requires Parabolic.efsLib in the FunctionLibrary folder.              
// If you do not have this file you can download it at the link below.            
// http://share.esignal.com/groupcontents.jsp?folder=Formulas-Libraries&groupid=10

var fpArray = new Array();

function preMain(){
    setPriceStudy(true);
    setStudyTitle("Parabolic")
    setCursorLabelName("Parabolic");
    setPlotType(PLOTTYPE_DOT);
    setDefaultBarThickness(2);
    var x=0;
    fpArray[x] = new FunctionParameter("AF", FunctionParameter.NUMBER);
	with(fpArray[x++]){
        setLowerLimit(0);		
        setDefault(0.02);
    }
    fpArray[x] = new FunctionParameter("AFMax", FunctionParameter.NUMBER);
	with(fpArray[x++]){
        setLowerLimit(0);		
        setDefault(0.2);
    }
	fpArray[x] = new FunctionParameter("Interval", FunctionParameter.STRING);
	with(fpArray[x++]){
        setDefault();
    }
    fpArray[x] = new FunctionParameter("Params", FunctionParameter.BOOLEAN);
	with(fpArray[x++]){
        setName("Show Parameters");
        setDefault(false);
    }
}

var amLib = addLibrary("Parabolic.efsLib");
var bInit = false;
var xParabolic = null;

function main(AF,AFMax,Interval,Params){
    if(bInit==false){
        with ( amLib ){
            if(Interval == null) Interval = getInterval();
            var vInterval = Interval;
            xParabolic = getSeries(amParabolic(AF,AFMax,inv(vInterval)));
            setShowTitleParameters(eval(Params));
            bInit=true;
        }
    }
    var nParabolic = xParabolic.getValue(-1);//see Note1 and Note2 below
    return nParabolic;
}

//Note1:
//Replace xParabolic.getValue(-1) with xParabolic.getValue(0) 
//to plot the current value of the Parabolic study
//Note2
//Replace xParabolic.getValue(-1) with xParabolic 
//to plot current value of the Parabolic study and wish to 
//maintain full synchronization when using multiple intervals