bbgo_origin/pkg/indicator/ad.go

80 lines
1.6 KiB
Go

package indicator
import (
"time"
"github.com/c9s/bbgo/pkg/types"
)
/*
ad implements accumulation/distribution indicator
Accumulation/Distribution Indicator (A/D)
- https://www.investopedia.com/terms/a/accumulationdistribution.asp
*/
//go:generate callbackgen -type AD
type AD struct {
types.IntervalWindow
Values types.Float64Slice
PrePrice float64
EndTime time.Time
UpdateCallbacks []func(value float64)
}
func (inc *AD) Update(high, low, cloze, volume float64) {
var moneyFlowVolume float64
if high == low {
moneyFlowVolume = 0
} else {
moneyFlowVolume = ((2*cloze - high - low) / (high - low)) * volume
}
ad := inc.Last() + moneyFlowVolume
inc.Values.Push(ad)
}
func (inc *AD) Last() float64 {
if len(inc.Values) == 0 {
return 0.0
}
return inc.Values[len(inc.Values)-1]
}
func (inc *AD) Index(i int) float64 {
length := len(inc.Values)
if length == 0 || length-i-1 < 0 {
return 0
}
return inc.Values[length-i-1]
}
func (inc *AD) Length() int {
return len(inc.Values)
}
var _ types.Series = &AD{}
func (inc *AD) calculateAndUpdate(kLines []types.KLine) {
for _, k := range kLines {
if inc.EndTime != zeroTime && !k.EndTime.After(inc.EndTime) {
continue
}
inc.Update(k.High.Float64(), k.Low.Float64(), k.Close.Float64(), k.Volume.Float64())
}
inc.EmitUpdate(inc.Last())
inc.EndTime = kLines[len(kLines)-1].EndTime.Time()
}
func (inc *AD) handleKLineWindowUpdate(interval types.Interval, window types.KLineWindow) {
if inc.Interval != interval {
return
}
inc.calculateAndUpdate(window)
}
func (inc *AD) Bind(updater KLineWindowUpdater) {
updater.OnKLineWindowUpdate(inc.handleKLineWindowUpdate)
}