HMA Channels – EFS

HMA_Channels.efs EFSLibrary - Discussion Board
File Name: HMA_Channels.efs
Description:
HMA Channels
Formula Parameters:
Length : 20
Percentage : 0.5
Notes:
Download File:
HMA_Channels.efs

EFS Code:
/*********************************
Provided By:  
    eSignal (Copyright c eSignal), a division of Interactive Data 
    Corporation. 2009. 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:        
    HMA Channels
    
Version:            1.0  10/29/2009
 
Formula Parameters:                     Default:
    Length                              20
    Percentage                          0.5
    
Notes:
    
**********************************/
var fpArray = new Array();
var bInit = false;

function preMain(){
    setPriceStudy(true);
    setShowCursorLabel(true);
    setShowTitleParameters(false);
    setStudyTitle("HMA Channels");
    setCursorLabelName("Up Band", 0);
    setPlotType(PLOTTYPE_LINE, 0);
    setDefaultBarFgColor(Color.red, 0);
    setCursorLabelName("Dn Band", 1);    
    setPlotType(PLOTTYPE_LINE, 1);
    setDefaultBarFgColor(Color.red, 1);
    var x = 0;
    fpArray[x] = new FunctionParameter("Length", FunctionParameter.NUMBER);
    with(fpArray[x++]) {
        setLowerLimit(1);
        setDefault(20);
    }    
    fpArray[x] = new FunctionParameter("Percentage", FunctionParameter.NUMBER);
    with(fpArray[x++]) {
        setLowerLimit(0);
        setDefault(0.5);
    }        
}

var xMAD2 = null;
var xMA = null;

function main(Length, Percentage) {
var nBarState = getBarState();
var nUpBand = 0;
var nDnBand = 0;
var nMAD2 = 0;
var nMA = 0;
    if (nBarState == BARSTATE_ALLBARS) {
        if(Length == null) Length = 20;
        if(Percentage == null) Percentage = 0.5;
	}
	if (bInit == false) {
        xMAD2 = wma(Math.round(Length / 2), high());
        xMA = wma(Length, high());
        bInit = true;
	}
	nMAD2 = xMAD2.getValue(0);
	nMA = xMA.getValue(0);
	if (nMAD2 == null || nMA == null) return;
    nUpBand = (1 + Percentage / 100) * nMAD2 * 2 - nMA;
    nDnBand = (1 - Percentage / 100) * nMAD2 * 2 - nMA;
    return new Array(nUpBand, nDnBand);
}