Added indicators

pkg/datatype/bools/slice.go

@@ -0,0 +1,54 @@
+package bools
+
+type BoolSlice []bool
+
+func New(a ...bool) BoolSlice {
+	return BoolSlice(a)
+}
+
+func (s *BoolSlice) Push(v bool) {
+	*s = append(*s, v)
+}
+
+func (s *BoolSlice) Update(v bool) {
+	*s = append(*s, v)
+}
+
+func (s *BoolSlice) Pop(i int64) (v bool) {
+	v = (*s)[i]
+	*s = append((*s)[:i], (*s)[i+1:]...)
+	return v
+}
+
+func (s BoolSlice) Tail(size int) BoolSlice {
+	length := len(s)
+	if length <= size {
+		win := make(BoolSlice, length)
+		copy(win, s)
+		return win
+	}
+
+	win := make(BoolSlice, size)
+	copy(win, s[length-size:])
+	return win
+}
+
+func (s *BoolSlice) Length() int {
+	return len(*s)
+}
+
+func (s *BoolSlice) Index(i int) bool {
+	length := len(*s)
+	if length-i < 0 || i < 0 {
+		return false
+	}
+	return (*s)[length-i-1]
+}
+
+func (s *BoolSlice) Last() bool {
+	length := len(*s)
+	if length > 0 {
+		return (*s)[length-1]
+	}
+	return false
+}

pkg/indicator/supertrendPivot.go

@@ -0,0 +1,217 @@
+package indicator
+
+import (
+	"math"
+	"time"
+
+	"github.com/sirupsen/logrus"
+
+	"github.com/c9s/bbgo/pkg/datatype/floats"
+	"github.com/c9s/bbgo/pkg/types"
+)
+
+// based on "Pivot Point Supertrend by LonesomeTheBlue" from tradingview
+
+var logpst = logrus.WithField("indicator", "pivotSupertrend")
+
+//go:generate callbackgen -type PivotSupertrend
+type PivotSupertrend struct {
+	types.SeriesBase
+	types.IntervalWindow
+	ATRMultiplier float64 `json:"atrMultiplier"`
+	PivotWindow   int     `json:"pivotWindow"`
+
+	AverageTrueRange *ATR // Value must be set when initialized in strategy
+
+	PivotLow  *PivotLow  // Value must be set when initialized in strategy
+	PivotHigh *PivotHigh // Value must be set when initialized in strategy
+
+	trendPrices    floats.Slice // Tsl: value of the trend line (buy or sell)
+	supportLine    floats.Slice // The support line in an uptrend (green)
+	resistanceLine floats.Slice // The resistance line in a downtrend (red)
+
+	closePrice             float64
+	previousClosePrice     float64
+	uptrendPrice           float64
+	previousUptrendPrice   float64
+	downtrendPrice         float64
+	previousDowntrendPrice float64
+
+	lastPp            float64
+	src               float64 // center
+	previousPivotHigh float64 // temp variable to save the last value
+	previousPivotLow  float64 // temp variable to save the last value
+
+	trend         types.Direction
+	previousTrend types.Direction
+	tradeSignal   types.Direction
+
+	EndTime         time.Time
+	UpdateCallbacks []func(value float64)
+}
+
+func (inc *PivotSupertrend) Last() float64 {
+	return inc.trendPrices.Last()
+}
+
+func (inc *PivotSupertrend) Index(i int) float64 {
+	length := inc.Length()
+	if length == 0 || length-i-1 < 0 {
+		return 0
+	}
+	return inc.trendPrices[length-i-1]
+}
+
+func (inc *PivotSupertrend) Length() int {
+	return len(inc.trendPrices)
+}
+
+func (inc *PivotSupertrend) Update(highPrice, lowPrice, closePrice float64) {
+	if inc.Window <= 0 {
+		panic("window must be greater than 0")
+	}
+
+	if inc.AverageTrueRange == nil {
+		inc.SeriesBase.Series = inc
+	}
+
+	// Start with DirectionUp
+	if inc.trend != types.DirectionUp && inc.trend != types.DirectionDown {
+		inc.trend = types.DirectionUp
+	}
+
+	inc.previousPivotLow = inc.PivotLow.Last()
+	inc.previousPivotHigh = inc.PivotHigh.Last()
+
+	// Update High / Low pivots
+	inc.PivotLow.Update(lowPrice)
+	inc.PivotHigh.Update(highPrice)
+
+	// Update ATR
+	inc.AverageTrueRange.Update(highPrice, lowPrice, closePrice)
+
+	// Update last prices
+	inc.previousUptrendPrice = inc.uptrendPrice
+	inc.previousDowntrendPrice = inc.downtrendPrice
+	inc.previousClosePrice = inc.closePrice
+	inc.previousTrend = inc.trend
+
+	inc.closePrice = closePrice
+
+	// Initialize lastPp as soon as pivots are made
+	if inc.lastPp == 0 || math.IsNaN(inc.lastPp) {
+		if inc.PivotHigh.Length() > 0 {
+			inc.lastPp = inc.PivotHigh.Last()
+		} else if inc.PivotLow.Length() > 0 {
+			inc.lastPp = inc.PivotLow.Last()
+		} else {
+			inc.lastPp = math.NaN()
+			return
+		}
+	}
+
+	// Set lastPp to the latest pivotPoint (only changed when new pivot is found)
+	if inc.PivotHigh.Last() != inc.previousPivotHigh {
+		inc.lastPp = inc.PivotHigh.Last()
+	} else if inc.PivotLow.Last() != inc.previousPivotLow {
+		inc.lastPp = inc.PivotLow.Last()
+	}
+
+	// calculate the Center line using pivot points
+	if inc.src == 0 || math.IsNaN(inc.src) {
+		inc.src = inc.lastPp
+	} else {
+		//weighted calculation
+		inc.src = (inc.src*2 + inc.lastPp) / 3
+	}
+
+	// Update uptrend
+	inc.uptrendPrice = inc.src - inc.AverageTrueRange.Last()*inc.ATRMultiplier
+	if inc.previousClosePrice > inc.previousUptrendPrice {
+		inc.uptrendPrice = math.Max(inc.uptrendPrice, inc.previousUptrendPrice)
+	}
+
+	// Update downtrend
+	inc.downtrendPrice = inc.src + inc.AverageTrueRange.Last()*inc.ATRMultiplier
+	if inc.previousClosePrice < inc.previousDowntrendPrice {
+		inc.downtrendPrice = math.Min(inc.downtrendPrice, inc.previousDowntrendPrice)
+	}
+
+	// Update trend
+	if inc.previousTrend == types.DirectionUp && inc.closePrice < inc.previousUptrendPrice {
+		inc.trend = types.DirectionDown
+	} else if inc.previousTrend == types.DirectionDown && inc.closePrice > inc.previousDowntrendPrice {
+		inc.trend = types.DirectionUp
+	} else {
+		inc.trend = inc.previousTrend
+	}
+
+	// Update signal
+	if inc.AverageTrueRange.Last() <= 0 {
+		inc.tradeSignal = types.DirectionNone
+	} else if inc.trend == types.DirectionUp && inc.previousTrend == types.DirectionDown {
+		inc.tradeSignal = types.DirectionUp
+	} else if inc.trend == types.DirectionDown && inc.previousTrend == types.DirectionUp {
+		inc.tradeSignal = types.DirectionDown
+	} else {
+		inc.tradeSignal = types.DirectionNone
+	}
+
+	// Update trend price
+	if inc.trend == types.DirectionDown {
+		inc.trendPrices.Push(inc.downtrendPrice)
+	} else {
+		inc.trendPrices.Push(inc.uptrendPrice)
+	}
+
+	// Save the trend lines
+	inc.supportLine.Push(inc.uptrendPrice)
+	inc.resistanceLine.Push(inc.downtrendPrice)
+
+	logpst.Debugf("Update pivot point supertrend result: closePrice: %v, uptrendPrice: %v, downtrendPrice: %v, trend: %v,"+
+		" tradeSignal: %v, AverageTrueRange.Last(): %v", inc.closePrice, inc.uptrendPrice, inc.downtrendPrice,
+		inc.trend, inc.tradeSignal, inc.AverageTrueRange.Last())
+}
+
+// GetSignal returns signal (Down, None or Up)
+func (inc *PivotSupertrend) GetSignal() types.Direction {
+	return inc.tradeSignal
+}
+
+// GetDirection returns current trend
+func (inc *PivotSupertrend) GetDirection() types.Direction {
+	return inc.trend
+}
+
+// GetCurrentSupertrendSupport returns last supertrend support value
+func (inc *PivotSupertrend) GetCurrentSupertrendSupport() float64 {
+	return inc.supportLine.Last()
+}
+
+// GetCurrentSupertrendResistance returns last supertrend resistance value
+func (inc *PivotSupertrend) GetCurrentSupertrendResistance() float64 {
+	return inc.resistanceLine.Last()
+}
+
+var _ types.SeriesExtend = &PivotSupertrend{}
+
+func (inc *PivotSupertrend) PushK(k types.KLine) {
+	if inc.EndTime != zeroTime && !k.EndTime.After(inc.EndTime) {
+		return
+	}
+
+	inc.Update(k.GetHigh().Float64(), k.GetLow().Float64(), k.GetClose().Float64())
+	inc.EndTime = k.EndTime.Time()
+	inc.EmitUpdate(inc.Last())
+}
+
+func (inc *PivotSupertrend) BindK(target KLineClosedEmitter, symbol string, interval types.Interval) {
+	target.OnKLineClosed(types.KLineWith(symbol, interval, inc.PushK))
+}
+
+func (inc *PivotSupertrend) LoadK(allKLines []types.KLine) {
+	inc.SeriesBase.Series = inc
+	for _, k := range allKLines {
+		inc.PushK(k)
+	}
+}