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86 lines
1.6 KiB
Go
86 lines
1.6 KiB
Go
package indicator
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import (
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"time"
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"github.com/c9s/bbgo/pkg/types"
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)
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//go:generate callbackgen -type StdDev
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type StdDev struct {
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types.SeriesBase
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types.IntervalWindow
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Values types.Float64Slice
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rawValues *types.Queue
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EndTime time.Time
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updateCallbacks []func(value float64)
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}
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func (inc *StdDev) Last() float64 {
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if inc.Values.Length() == 0 {
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return 0.0
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}
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return inc.Values.Last()
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}
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func (inc *StdDev) Index(i int) float64 {
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if i >= inc.Values.Length() {
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return 0.0
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}
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return inc.Values.Index(i)
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}
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func (inc *StdDev) Length() int {
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return inc.Values.Length()
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}
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var _ types.SeriesExtend = &StdDev{}
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func (inc *StdDev) Update(value float64) {
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if inc.rawValues == nil {
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inc.rawValues = types.NewQueue(inc.Window)
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inc.SeriesBase.Series = inc
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}
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inc.rawValues.Update(value)
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var std = inc.rawValues.Stdev()
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inc.Values.Push(std)
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}
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func (inc *StdDev) PushK(k types.KLine) {
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inc.Update(k.Close.Float64())
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inc.EndTime = k.EndTime.Time()
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}
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func (inc *StdDev) CalculateAndUpdate(allKLines []types.KLine) {
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var last = allKLines[len(allKLines)-1]
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if inc.rawValues == nil {
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for _, k := range allKLines {
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if inc.EndTime != zeroTime && k.EndTime.Before(inc.EndTime) {
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continue
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}
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inc.PushK(k)
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}
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} else {
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inc.PushK(last)
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}
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inc.EmitUpdate(inc.Values.Last())
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}
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func (inc *StdDev) handleKLineWindowUpdate(interval types.Interval, window types.KLineWindow) {
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if inc.Interval != interval {
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return
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}
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inc.CalculateAndUpdate(window)
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}
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func (inc *StdDev) Bind(updater KLineWindowUpdater) {
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updater.OnKLineWindowUpdate(inc.handleKLineWindowUpdate)
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}
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