package indicator import ( "time" "github.com/c9s/bbgo/pkg/types" ) /* macd implements moving average convergence divergence indicator Moving Average Convergence Divergence (MACD) - https://www.investopedia.com/terms/m/macd.asp */ //go:generate callbackgen -type MACD type MACD struct { types.IntervalWindow // 9 ShortPeriod int // 12 LongPeriod int // 26 Values types.Float64Slice FastEWMA EWMA SlowEWMA EWMA SignalLine EWMA Histogram types.Float64Slice EndTime time.Time UpdateCallbacks []func(value float64) } func (inc *MACD) Update(x float64) { if len(inc.Values) == 0 { inc.FastEWMA = EWMA{IntervalWindow: types.IntervalWindow{Window: inc.ShortPeriod}} inc.SlowEWMA = EWMA{IntervalWindow: types.IntervalWindow{Window: inc.LongPeriod}} inc.SignalLine = EWMA{IntervalWindow: types.IntervalWindow{Window: inc.Window}} } // update fast and slow ema inc.FastEWMA.Update(x) inc.SlowEWMA.Update(x) // update macd macd := inc.FastEWMA.Last() - inc.SlowEWMA.Last() inc.Values.Push(macd) // update signal line inc.SignalLine.Update(macd) // update histogram inc.Histogram.Push(macd - inc.SignalLine.Last()) } func (inc *MACD) calculateMACD(kLines []types.KLine, priceF KLinePriceMapper) float64 { for _, kline := range kLines { inc.Update(kline.Close.Float64()) } return inc.Values[len(inc.Values)-1] } func (inc *MACD) calculateAndUpdate(kLines []types.KLine) { if len(kLines) == 0 { return } for _, k := range kLines { if inc.EndTime != zeroTime && !k.EndTime.After(inc.EndTime) { continue } inc.Update(k.Close.Float64()) } inc.EmitUpdate(inc.Values[len(inc.Values)-1]) inc.EndTime = kLines[len(kLines)-1].EndTime.Time() } func (inc *MACD) handleKLineWindowUpdate(interval types.Interval, window types.KLineWindow) { if inc.Interval != interval { return } inc.calculateAndUpdate(window) } func (inc *MACD) Bind(updater KLineWindowUpdater) { updater.OnKLineWindowUpdate(inc.handleKLineWindowUpdate) } type MACDValues struct { types.SeriesBase *MACD } func (inc *MACDValues) Last() float64 { if len(inc.Values) == 0 { return 0.0 } return inc.Values[len(inc.Values)-1] } func (inc *MACDValues) Index(i int) float64 { length := len(inc.Values) if length == 0 || length-1-i < 0 { return 0.0 } return inc.Values[length-1+i] } func (inc *MACDValues) Length() int { return len(inc.Values) } func (inc *MACD) MACD() types.SeriesExtend { out := &MACDValues{MACD: inc} out.SeriesBase.Series = out return out } func (inc *MACD) Singals() types.SeriesExtend { return &inc.SignalLine }