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adding a helper method, DrawBoundedSeries to help w/ bounded series drawing.

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This commit is contained in:
Will Charczuk 2016-07-15 17:15:06 -07:00
parent 3c9f7032a3
commit 9a19bf094b
2 changed files with 61 additions and 47 deletions
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54
bollinger_band_series.go
View file

@ -110,54 +110,14 @@ func (bbs *BollingerBandsSeries) GetLastBoundedValue() (x, y1, y2 float64) {
} }
// Render renders the series. // Render renders the series.
func (bbs BollingerBandsSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) { func (bbs *BollingerBandsSeries) Render(r Renderer, canvasBox Box, xrange, yrange Range, defaults Style) {
s := bbs.Style.WithDefaultsFrom(defaults) s := bbs.Style.WithDefaultsFrom(defaults.WithDefaultsFrom(Style{
StrokeWidth: 1.0,
StrokeColor: DefaultAxisColor.WithAlpha(64),
FillColor: DefaultAxisColor.WithAlpha(32),
}))
r.SetStrokeColor(s.GetStrokeColor()) DrawBoundedSeries(r, canvasBox, xrange, yrange, s, bbs, bbs.GetWindowSize())
r.SetStrokeDashArray(s.GetStrokeDashArray())
r.SetStrokeWidth(s.GetStrokeWidth())
r.SetFillColor(s.GetFillColor())
cb := canvasBox.Bottom
cl := canvasBox.Left
v0x, v0y1, v0y2 := bbs.GetBoundedValue(0)
x0 := cl + xrange.Translate(v0x)
y0 := cb - yrange.Translate(v0y1)
var vx, vy1, vy2 float64
var x, y int
xvalues := make([]float64, bbs.Len())
xvalues[0] = v0x
y2values := make([]float64, bbs.Len())
y2values[0] = v0y2
r.MoveTo(x0, y0)
for i := 1; i < bbs.Len(); i++ {
vx, vy1, vy2 = bbs.GetBoundedValue(i)
xvalues[i] = vx
y2values[i] = vy2
x = cl + xrange.Translate(vx)
y = cb - yrange.Translate(vy1)
if i > bbs.GetWindowSize() {
r.LineTo(x, y)
} else {
r.MoveTo(x, y)
}
}
y = cb - yrange.Translate(vy2)
r.LineTo(x, y)
for i := bbs.Len() - 1; i >= bbs.GetWindowSize(); i-- {
vx, vy2 = xvalues[i], y2values[i]
x = cl + xrange.Translate(vx)
y = cb - yrange.Translate(vy2)
r.LineTo(x, y)
}
r.Close()
r.FillStroke()
} }
func (bbs BollingerBandsSeries) getAverage(valueBuffer *RingBuffer) float64 { func (bbs BollingerBandsSeries) getAverage(valueBuffer *RingBuffer) float64 {

54
drawing_helpers.go
View file

@ -48,6 +48,60 @@ func DrawLineSeries(r Renderer, canvasBox Box, xrange, yrange Range, s Style, vs
r.Stroke() r.Stroke()
} }
// DrawBoundedSeries draws a series that implements BoundedValueProvider.
func DrawBoundedSeries(r Renderer, canvasBox Box, xrange, yrange Range, s Style, bbs BoundedValueProvider, drawOffsetIndexes ...int) {
drawOffsetIndex := 0
if len(drawOffsetIndexes) > 0 {
drawOffsetIndex = drawOffsetIndexes[0]
}
r.SetStrokeColor(s.GetStrokeColor())
r.SetStrokeDashArray(s.GetStrokeDashArray())
r.SetStrokeWidth(s.GetStrokeWidth())
r.SetFillColor(s.GetFillColor())
cb := canvasBox.Bottom
cl := canvasBox.Left
v0x, v0y1, v0y2 := bbs.GetBoundedValue(0)
x0 := cl + xrange.Translate(v0x)
y0 := cb - yrange.Translate(v0y1)
var vx, vy1, vy2 float64
var x, y int
xvalues := make([]float64, bbs.Len())
xvalues[0] = v0x
y2values := make([]float64, bbs.Len())
y2values[0] = v0y2
r.MoveTo(x0, y0)
for i := 1; i < bbs.Len(); i++ {
vx, vy1, vy2 = bbs.GetBoundedValue(i)
xvalues[i] = vx
y2values[i] = vy2
x = cl + xrange.Translate(vx)
y = cb - yrange.Translate(vy1)
if i > drawOffsetIndex {
r.LineTo(x, y)
} else {
r.MoveTo(x, y)
}
}
y = cb - yrange.Translate(vy2)
r.LineTo(x, y)
for i := bbs.Len() - 1; i >= drawOffsetIndex; i-- {
vx, vy2 = xvalues[i], y2values[i]
x = cl + xrange.Translate(vx)
y = cb - yrange.Translate(vy2)
r.LineTo(x, y)
}
r.Close()
r.FillStroke()
}
// MeasureAnnotation measures how big an annotation would be. // MeasureAnnotation measures how big an annotation would be.
func MeasureAnnotation(r Renderer, canvasBox Box, s Style, lx, ly int, label string) Box { func MeasureAnnotation(r Renderer, canvasBox Box, s Style, lx, ly int, label string) Box {
r.SetFillColor(s.GetFillColor(DefaultAnnotationFillColor)) r.SetFillColor(s.GetFillColor(DefaultAnnotationFillColor))