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adding GetLastBoundedValue and tests

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This commit is contained in:
Will Charczuk 2016-07-15 13:27:45 -07:00
parent d888440415
commit f8573f1123
2 changed files with 47 additions and 0 deletions
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28
bollinger_band_series.go
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@ -81,6 +81,34 @@ func (bbs *BollingerBandsSeries) GetBoundedValue(index int) (x, y1, y2 float64)
return
}
// GetLastBoundedValue returns the last bounded value for the series.
func (bbs *BollingerBandsSeries) GetLastBoundedValue() (x, y1, y2 float64) {
if bbs.InnerSeries == nil {
return
}
windowSize := bbs.GetWindowSize()
seriesLength := bbs.InnerSeries.Len()
startAt := seriesLength - windowSize
if startAt < 0 {
startAt = 0
}
vb := NewRingBufferWithCapacity(windowSize)
for index := startAt; index < seriesLength; index++ {
xn, yn := bbs.InnerSeries.GetValue(index)
vb.Enqueue(yn)
x = xn
}
ay := bbs.getAverage(vb)
std := bbs.getStdDev(vb)
y1 = ay + (bbs.GetK() * std)
y2 = ay - (bbs.GetK() * std)
return
}
// Render renders the series.
func (bbs BollingerBandsSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) {
s := bbs.Style.WithDefaultsFrom(defaults)