var fpArray = [];
var vMA1 = null;
var xMA2 = null;
var xMA3 = null;

function preMain(){
    setPriceStudy(true);
    setStudyTitle("EMA");
    setCursorLabelName("EMA_1", 0);
    setDefaultBarFgColor(Color.blue, 0);
    setDefaultBarThickness(1, 0);
    setCursorLabelName("EMA_2", 1);
    setDefaultBarFgColor(Color.white, 1);
    setDefaultBarThickness(1, 1);
    setCursorLabelName("EMA_3", 2);
    setDefaultBarFgColor(Color.magenta, 2);
    setDefaultBarThickness(1, 2);
    
    var x=0;
    fpArray[x] = new FunctionParameter("Length", FunctionParameter.NUMBER);
        fpArray[x].setLowerLimit(1); 
        fpArray[x++].setDefault(8);
    
    fpArray[x] = new FunctionParameter("Offset", FunctionParameter.NUMBER);
        fpArray[x++].setDefault(0);

    fpArray[x] = new FunctionParameter("IntervalTwo", FunctionParameter.NUMBER);
        fpArray[x].setLowerLimit(1); 
        fpArray[x++].setDefault(2);

    fpArray[x] = new FunctionParameter("IntervalThree", FunctionParameter.NUMBER);
        fpArray[x].setLowerLimit(1); 
        fpArray[x++].setDefault(3);
    
    fpArray[x] = new FunctionParameter("Source", FunctionParameter.STRING);
    with(fpArray[x++]){
        setName("Source");
        addOption("Close");
        addOption("High");
        addOption("Low");
        addOption("Open");
        addOption("HL/2");
        addOption("HLC/3");
        addOption("OHLC/4");
        setDefault("Close");
    }
    fpArray[x] = new FunctionParameter("Type", FunctionParameter.STRING);
    with(fpArray[x++]){
        setName("Type");
        addOption("MAStudy.SIMPLE");
        addOption("MAStudy.EXPONENTIAL");
        addOption("MAStudy.WEIGHTED");
        addOption("MAStudy.VOLUMEWEIGHTED");
        setDefault("MAStudy.EXPONENTIAL");
    }
}

function main(Length, Offset, IntervalTwo, IntervalThree, Source, Type){
    if(getBarState() == BARSTATE_ALLBARS){
        vMA1 = new MAStudy(Length, Offset, Source, eval(Type));
        xMA2 = ema(Length, close(inv(IntervalTwo)));
        xMA3 = ema(Length, close(inv(IntervalThree)));
    }
    if(vMA1.getValue(MAStudy.MA,0) > vMA1.getValue(MAStudy.MA,-1)) setBarFgColor(Color.green);
    else setBarFgColor(Color.red);
    
    return [vMA1.getValue(MAStudy.MA), xMA2.getValue(0), xMA3.getValue(0)];
}