/* 
Only for illustration purposes.
Please test the logic and signals before using it in any meaningful way.
eSignal doesnt take any responsibility for any bugs OR wrong signal values 
- AM / eSignal
*/

var vCntr = 0;
var vCMA1 , vCMA2 = null;
var xSpeedCMA , xSMASpeedCMA = null;

var Offset1 , Offset2;
var nCMA1, nCMA2;
var nCMAOsc, nCMAOsc_1;
var nSpeed;
var nCMA,nSMACMA;

addBand(0, PS_SOLID, 1, Color.blue, "0-axis")

function preMain() {

    setPriceStudy(false);
    setStudyTitle("CenteredMA_Oscillator");

    setCursorLabelName("V", 0);
    setDefaultBarStyle(PS_SOLID, 0);
    setDefaultBarFgColor(Color.magenta, 0);
    setDefaultBarThickness(1, 0);
    setPlotType(PLOTTYPE_LINE, 0);

    setCursorLabelName("V-SMA", 1);
    setDefaultBarStyle(PS_SOLID, 1);
    setDefaultBarFgColor(Color.black, 1);
    setDefaultBarThickness(1, 1);
    setPlotType(PLOTTYPE_LINE, 1);

    var fp1 = new FunctionParameter("MALength1", FunctionParameter.NUMBER);
    fp1.setLowerLimit(1);
    fp1.setDefault(32);

    var fp2 = new FunctionParameter("MALength2", FunctionParameter.NUMBER);
    fp2.setLowerLimit(1);
    fp2.setDefault(64);

    var fp3 = new FunctionParameter("MASource", FunctionParameter.STRING);
    fp3.setName("MASource");
    fp3.addOption("Close");
    fp3.addOption("High");
    fp3.addOption("Low");
    fp3.addOption("Open");
    fp3.addOption("HL/2");
    fp3.addOption("HLC/3");
    fp3.addOption("OHLC/4");
    fp3.setDefault("Close");

    var fp4 = new FunctionParameter("MAType", FunctionParameter.STRING);
    fp4.setName("MAType");
    fp4.addOption("MAStudy.SIMPLE");
    fp4.addOption("MAStudy.EXPONENTIAL");
    fp4.addOption("MAStudy.WEIGHTED");
    fp4.addOption("MAStudy.VOLUMEWEIGHTED");
    fp4.setDefault("MAStudy.SIMPLE");
}



function main(MALength1, MALength2, MASource, MAType) {

    if (xSpeedCMA == null) xSpeedCMA = efsInternal("retSpeedCMA", MALength1, MALength2, MASource, MAType);
    if (xSMASpeedCMA == null) xSMASpeedCMA = sma(10, xSpeedCMA);
 
 
    if(xSpeedCMA.getValue(0) !=0) nCMA_last= xSpeedCMA.getValue(0);
    if(xSMASpeedCMA.getValue(0) !=0) nSMACMA_last= xSMASpeedCMA.getValue(0);
    
 if (xSpeedCMA.getValue(0)==0)  nCMA=nCMA_last; 
 else  nCMA=xSpeedCMA.getValue(0);
 
 if (xSMASpeedCMA.getValue(0)==0) nSMACMA = nSMACMA_last;
 else  nSMACMA=xSMASpeedCMA.getValue(0);
 
 
    return new Array(nCMA, nSMACMA);
}



function retSpeedCMA (MALength1, MALength2, MASource, MAType) {

    if (getBarState() == BARSTATE_NEWBAR) vCntr += 1;
    if (vCntr < MALength1 * 2) return;

    Offset1 = Math.ceil(MALength1 / 2) * ( - 1);
    Offset2 = Math.ceil(MALength2 / 2) * ( - 1);

    if (vCMA1 == null) vCMA1 = new MAStudy(MALength1, Offset1, MASource, eval(MAType));
    if (vCMA2 == null) vCMA2 = new MAStudy(MALength2, Offset2, MASource, eval(MAType));

    nCMA1 = vCMA1.getValue(0);
    nCMA2 = vCMA2.getValue(0);

    if (nCMA1 != null && nCMA2 != null) nCMAOsc = (nCMA1 - nCMA2);

    if (nCMAOsc_1 != null) nSpeed = nCMAOsc - nCMAOsc_1;

    nCMAOsc_1 = nCMAOsc;
    return nSpeed;
}