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108 lines
2.2 KiB
Go
108 lines
2.2 KiB
Go
package indicator
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import (
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"math"
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"github.com/c9s/bbgo/pkg/datatype/floats"
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"github.com/c9s/bbgo/pkg/types"
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)
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// Refer: True Strength Index
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// Refer URL: https://www.investopedia.com/terms/t/tsi.asp
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//go:generate callbackgen -type TSI
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type TSI struct {
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types.SeriesBase
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types.IntervalWindow
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PrevValue float64
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Values floats.Slice
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Pcs *EWMA
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Pcds *EWMA
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Apcs *EWMA
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Apcds *EWMA
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updateCallbacks []func(value float64)
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}
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func (inc *TSI) Update(value float64) {
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if inc.Pcs == nil {
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inc.Pcs = &EWMA{
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IntervalWindow: types.IntervalWindow{
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Window: 25,
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Interval: inc.Interval,
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},
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}
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inc.Pcds = &EWMA{
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IntervalWindow: types.IntervalWindow{
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Window: 13,
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Interval: inc.Interval,
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},
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}
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inc.Apcs = &EWMA{
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IntervalWindow: types.IntervalWindow{
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Window: 25,
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Interval: inc.Interval,
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},
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}
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inc.Apcds = &EWMA{
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IntervalWindow: types.IntervalWindow{
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Window: 13,
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Interval: inc.Interval,
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},
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}
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inc.SeriesBase.Series = inc
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}
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if inc.PrevValue == 0 {
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inc.PrevValue = value
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return
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}
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pc := value - inc.PrevValue
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inc.Pcs.Update(pc)
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inc.Pcds.Update(inc.Pcs.Last())
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apc := math.Abs(pc)
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inc.Apcs.Update(apc)
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inc.Apcds.Update(inc.Apcs.Last())
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tsi := (inc.Pcds.Last() / inc.Apcds.Last()) * 100.
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inc.Values.Push(tsi)
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if inc.Values.Length() > MaxNumOfEWMA {
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inc.Values = inc.Values[MaxNumOfEWMATruncateSize-1:]
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}
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inc.PrevValue = value
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}
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func (inc *TSI) Last() float64 {
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return inc.Values.Last()
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}
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func (inc *TSI) Index(i int) float64 {
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return inc.Values.Index(i)
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}
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func (inc *TSI) PushK(k types.KLine) {
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inc.Update(k.Close.Float64())
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}
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var _ types.SeriesExtend = &TSI{}
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func (inc *TSI) CalculateAndUpdate(allKLines []types.KLine) {
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if inc.PrevValue == 0 {
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for _, k := range allKLines {
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inc.PushK(k)
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inc.EmitUpdate(inc.Last())
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}
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} else {
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k := allKLines[len(allKLines)-1]
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inc.PushK(k)
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inc.EmitUpdate(inc.Last())
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}
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}
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func (inc *TSI) 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 *TSI) Bind(updater KLineWindowUpdater) {
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updater.OnKLineWindowUpdate(inc.handleKLineWindowUpdate)
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}
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