tsuz/go-pine

package pine

// KC generates ValueSeries of ketler channel's middle, upper and lower in that order.
func KC(src ValueSeries, o OHLCVSeries, l int64, mult float64, usetr bool) (middle, upper, lower ValueSeries) {

    lower = NewValueSeries()
    upper = NewValueSeries()
    middle = NewValueSeries()
    start := src.GetCurrent()

    if start == nil {
        return middle, upper, lower
    }

    var span ValueSeries
    basis := EMA(src, l)

    if usetr {
        span = OHLCVAttr(o, OHLCPropTR)
    } else {
        h := OHLCVAttr(o, OHLCPropHigh)
        l := OHLCVAttr(o, OHLCPropLow)
        span = Sub(h, l)
    }

    rangeEma := EMA(span, l)

    middle = basis
    rangeEmaMul := MulConst(rangeEma, mult)
    upper = Add(basis, rangeEmaMul)
    lower = Sub(basis, rangeEmaMul)

    middle.SetCurrent(start.t)
    upper.SetCurrent(start.t)
    lower.SetCurrent(start.t)

    return middle, upper, lower
}