200 lines
7.0 KiB
Go
200 lines
7.0 KiB
Go
package mujica
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import (
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"fmt"
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"math"
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"strings"
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"time"
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"github.com/egoist/mygo/ui"
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"mujicaui/internal"
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"mujicaui/theme"
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)
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// QuotePoint holds time, price, and incremental volume.
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type QuotePoint struct {
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Time time.Time
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Price float64
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Volume float64
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}
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// LineQuoteChartOptions configure a LineQuoteChart.
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type LineQuoteChartOptions struct {
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Frame ChartFrame
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// PrevClose is the required positive baseline price.
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PrevClose float64
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// RegularOpen and RegularClose optionally delimit extended trading sessions.
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RegularOpen, RegularClose time.Time
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Decimals int
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}
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// lineQuoteSession returns pre-market, regular, or after-market.
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func lineQuoteSession(t time.Time, opts LineQuoteChartOptions) int {
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switch {
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case opts.RegularOpen.IsZero():
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return 0
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case t.Before(opts.RegularOpen):
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return -1
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case !t.Before(opts.RegularClose):
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return 1
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}
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return 0
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}
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// LineQuoteChart draws price, weighted average, and extended sessions.
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func LineQuoteChart(c *ui.Context, points []QuotePoint, opts LineQuoteChartOptions) ChartResult {
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if math.IsInf(opts.PrevClose, 0) || !(opts.PrevClose > 0) {
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panic("mujica: LineQuoteChart needs a positive PrevClose")
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}
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if opts.RegularOpen.IsZero() != opts.RegularClose.IsZero() || opts.RegularClose.Before(opts.RegularOpen) {
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panic("mujica: LineQuoteChart needs both session bounds, in order")
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}
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dec := priceDecimals("LineQuoteChart", opts.Decimals)
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ch := newChart(c, opts.Frame)
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k := Tokens(c)
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avg := chartMemo(ch, "avg", chartID(points), func() []float64 {
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out := make([]float64, len(points))
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var pv, v float64
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for i, p := range points {
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if p.Time.IsZero() || i > 0 && !p.Time.After(points[i-1].Time) || !(p.Price > 0) || p.Volume < 0 || math.IsNaN(p.Volume) || math.IsInf(p.Volume, 0) || math.IsInf(p.Price, 0) {
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panic(fmt.Sprintf("mujica: LineQuoteChart point %d is out of order or invalid", i))
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}
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pv += p.Price * p.Volume
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v += p.Volume
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out[i] = p.Price
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if v > 0 {
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out[i] = pv / v
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}
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}
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return out
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})
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dom := chartMemo(ch, "y", [2]any{chartID(points), opts.PrevClose}, func() [2]float64 {
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lo, hi := opts.PrevClose, opts.PrevClose
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for i, p := range points {
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lo, hi = min(lo, p.Price, avg[i]), max(hi, p.Price, avg[i])
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}
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// Center the scale on the previous close.
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d := max(hi-opts.PrevClose, opts.PrevClose-lo)
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return [2]float64{opts.PrevClose - d, opts.PrevClose + d}
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})
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size := FontSize(c, theme.CaptionSize)
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geom := func(r ui.Rect) (ui.Rect, internal.Linear, internal.Linear) {
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plot := chartInset(r, 60, 26)
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plot.W -= 44 // percent axis on the right
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var t0, t1 float64
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if len(points) > 0 {
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t0, t1 = float64(points[0].Time.Unix()), float64(points[len(points)-1].Time.Unix())
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}
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return plot, internal.Linear{D0: t0, D1: t1, R0: float64(plot.X), R1: float64(plot.X + plot.W)},
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internal.Linear{D0: dom[0], D1: dom[1], R0: float64(plot.Y + plot.H), R1: float64(plot.Y)}
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}
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x := func(xs internal.Linear, i int) float32 { return xs.Map(float64(points[i].Time.Unix())) }
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spec := chartSpec{n: len(points), keys: []chartKey{
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{Name: msg(c, "line_quote_chart.price"), Color: k.AccentText, Shape: 0},
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{Name: msg(c, "line_quote_chart.average"), Color: k.Warning, Shape: 3},
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}}
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spec.pick = func(r ui.Rect, px, py float32) int {
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plot, xs, _ := geom(r)
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if !plot.Contains(px, py) {
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return -1
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}
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return internal.Nearest(len(points), func(i int) (float32, float32) { return x(xs, i), 0 }, px, 0, plot.W, true)
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}
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spec.readout = func(i int) string {
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p := points[i]
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chg := (p.Price/opts.PrevClose - 1) * 100
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parts := []string{p.Time.Format("15:04"), priceUngrouped(p.Price, dec), fmt.Sprintf("%+.2f%% %s", chg, trendWord(c, trendSign(chg))),
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msg(c, "line_quote_chart.average") + " " + priceUngrouped(avg[i], dec)}
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if s := lineQuoteSession(p.Time, opts); s != 0 {
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parts = append(parts, msg(c, map[int]string{-1: "line_quote_chart.pre", 1: "line_quote_chart.after"}[s]))
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}
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return strings.Join(parts, " · ")
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}
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spec.draw = func(p *ui.Painter, r ui.Rect, active int) {
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plot, xs, ys := geom(r)
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_, _, step := internal.Nice(dom[0], dom[1], 6)
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ticks := internal.Ticks(dom[0], dom[1], step)
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internal.AxisY(p, plot, ys, ticks, func(v float64) string { return internal.FormatTick(v, step) }, size, k)
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for _, t := range ticks {
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chartText(p, fmt.Sprintf("%+.2f%%", (t/opts.PrevClose-1)*100), plot.X+plot.W+6, ys.Map(t), size, trendColor(c, trendSign(t-opts.PrevClose)), 0, 0.5)
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}
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lineQuoteSessions(p, plot, xs, opts, size, c)
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var tx []float32
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var tl []string
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if len(points) > 1 {
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ts, layout := internal.TimeTicks(points[0].Time, points[len(points)-1].Time, max(2, int(plot.W/90)))
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for _, t := range ts {
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if layout == "Jan 2" {
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layout = msg(c, "candlestick_chart.daily_time")
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}
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tx, tl = append(tx, xs.Map(float64(t.Unix()))), append(tl, t.Format(layout))
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}
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}
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internal.AxisX(p, plot, tx, tl, size, k)
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by := internal.Snap(p, ys.Map(opts.PrevClose))
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for xx := plot.X; xx < plot.X+plot.W; xx += 6 {
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p.Line(xx, by, min(xx+3, plot.X+plot.W), by, 1, k.TextMuted)
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}
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price := chartMemo(ch, "prices", chartID(points), func() []float64 {
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out := make([]float64, len(points))
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for i, pt := range points {
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out[i] = pt.Price
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}
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return out
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})
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at := func(i int) float32 { return x(xs, i) }
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for li, vals := range [][]float64{price, avg} {
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col := []ui.Color{k.AccentText, k.Warning}[li]
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runs := chartMemo(ch, fmt.Sprint("quote.runs.", li), [3]any{chartID(points), plot.X, plot.W}, func() [][]int {
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var out [][]int
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chartRuns(vals, at, func(idx []int) { out = append(out, idx) })
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return out
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})
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for _, idx := range runs {
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var line ui.Path
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for j, i := range idx {
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px, py := internal.Snap(p, at(i)), internal.Snap(p, ys.Map(vals[i]))
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if j == 0 {
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line.MoveTo(px, py)
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} else {
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line.LineTo(px, py)
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}
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}
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p.StrokePath(&line, []float32{1.75, 1.25}[li], col)
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for j := 0; j < len(idx); j += max(1, len(idx)/12) {
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i := idx[j]
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internal.Marker(p, []int{0, 3}[li], at(i), ys.Map(vals[i]), 5, col)
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}
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}
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}
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if active >= 0 {
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ax := internal.Snap(p, at(active))
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p.Line(ax, plot.Y, ax, plot.Y+plot.H, 1, k.TextMuted)
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internal.Marker(p, 0, ax, ys.Map(price[active]), 9, k.AccentText)
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internal.Marker(p, 3, ax, ys.Map(avg[active]), 9, k.Warning)
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}
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}
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res, _ := ch.build(spec)
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return res
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}
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// lineQuoteSessions shades and labels the pre- and after-market spans.
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func lineQuoteSessions(p *ui.Painter, plot ui.Rect, xs internal.Linear, opts LineQuoteChartOptions, size float32, c *ui.Context) {
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if opts.RegularOpen.IsZero() {
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return
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}
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k := Tokens(c)
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x0, x1 := max(plot.X, xs.Map(float64(opts.RegularOpen.Unix()))), min(plot.X+plot.W, xs.Map(float64(opts.RegularClose.Unix())))
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for _, span := range []struct {
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a, b float32
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key string
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}{{plot.X, x0, "line_quote_chart.pre"}, {x1, plot.X + plot.W, "line_quote_chart.after"}} {
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if span.b-span.a < 1 {
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continue
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}
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p.Fill(ui.Rect{X: span.a, Y: plot.Y, W: span.b - span.a, H: plot.H}, k.SurfaceHover.Alpha(0.6), 0)
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chartText(p, msg(c, span.key), span.a+4, plot.Y+2, size, k.TextMuted, 0, 0)
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}
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}
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