/*********************************************************
Alexis C. Montenegro © December 2004                      
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.                      
**********************************************************/

var fpArray = new Array();

function preMain() {
    setPriceStudy(true);
	setStudyTitle("High-Low");
	// High
	setDefaultBarStyle(PS_SOLID, 0);
	setPlotType(PLOTTYPE_FLATLINES,0)
	setDefaultBarFgColor(Color.blue, 0);
	setDefaultBarThickness(2, 0);
    // Low
	setDefaultBarStyle(PS_SOLID, 1);
	setPlotType(PLOTTYPE_FLATLINES,1)
	setDefaultBarFgColor(Color.red, 1);
	setDefaultBarThickness(2, 1);
    var x=0;
	fpArray[x] = new FunctionParameter("Interval", FunctionParameter.STRING);
	with(fpArray[x++]){
        setDefault();
    }
    fpArray[x] = new FunctionParameter("Lookback", FunctionParameter.NUMBER);
	with(fpArray[x++]){
        setLowerLimit(0);
        setDefault(0);
    }
    fpArray[x] = new FunctionParameter("ColorHi", FunctionParameter.COLOR);
	with(fpArray[x++]){
        setName("Color High");
        setDefault(Color.blue);
    }
	fpArray[x] = new FunctionParameter("ColorLo", FunctionParameter.COLOR);
	with(fpArray[x++]){
        setName("Color Low");
        setDefault(Color.red);
    }
    fpArray[x] = new FunctionParameter("Params", FunctionParameter.BOOLEAN);
	with(fpArray[x++]){
        setName("Show Parameters");
        setDefault(false);
    }
}

var bInit = false;
var vInterval = null;
var xHigh  = null;
var xLow   = null;

function main(Interval,Lookback,ColorHi,ColorLo,Params) {
    if(bInit == false){
        if(isIntraday() && Interval == null) Interval = "D";
        else if(isDaily() && Interval == null) Interval = "W";
        else if(isWeekly() && Interval == null) Interval = "M";
        else if(Interval == null) Interval = getInterval();
        vInterval = Interval;
        xHigh  = getSeries(high(inv(vInterval)));
        xLow   = getSeries(low(inv(vInterval)));
        setCursorLabelName("High ("+Lookback+"), "+vInterval,0);
        setCursorLabelName("Low ("+Lookback+"), "+vInterval,1);
        setDefaultBarFgColor(ColorHi,0);
        setDefaultBarFgColor(ColorLo,1);
        setShowTitleParameters(eval(Params));
        bInit = true;
    }
    if(Lookback == 0){
        var vHigh  = xHigh;
        var vLow   = xLow;
    } else {
        var vHigh  = xHigh.getValue(-Lookback);
        var vLow   = xLow.getValue(-Lookback);
    }
    return new Array(vHigh,vLow);
}