77 lines
2.7 KiB
Go
77 lines
2.7 KiB
Go
package mujica
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import (
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"fmt"
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"math"
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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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// SentimentGaugeOptions configure a SentimentGauge.
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type SentimentGaugeOptions struct {
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// Label names the index, such as "Fear & Greed".
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Label string
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// Size is the dial width; zero is 240 DIPs.
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Size float32
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}
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var sentimentBands = [5]string{"sentiment_gauge.extreme_fear", "sentiment_gauge.fear", "sentiment_gauge.neutral",
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"sentiment_gauge.greed", "sentiment_gauge.extreme_greed"}
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// sentimentBand is the band index of a 0 to 100 value.
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func sentimentBand(v float64) int { return min(4, int(v/20)) }
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// SentimentGauge is a half dial from extreme fear to extreme greed, with the value and its word.
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func SentimentGauge(c *ui.Context, value float64, opts SentimentGaugeOptions) *ui.Element {
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if math.IsNaN(value) || value < 0 || value > 100 {
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panic("mujica: SentimentGauge value must be in 0..100")
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}
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if opts.Size < 0 {
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panic("mujica: SentimentGauge Size is negative")
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}
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w := opts.Size
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if w == 0 {
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w = 240
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}
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k := Tokens(c)
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u := Density(c).Unit()
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band := sentimentBand(value)
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word := msg(c, sentimentBands[band])
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label := fmt.Sprintf("%.0f, %s", value, word)
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if opts.Label != "" {
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label = opts.Label + ": " + label
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}
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// Fear to greed runs from the fall color to the rise color.
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fear, greed := trendColor(c, -1), trendColor(c, 1)
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cols := [5]ui.Color{fear, fear.Mix(k.Surface, 0.45), k.TextMuted, greed.Mix(k.Surface, 0.45), greed}
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size := FontSize(c, theme.CaptionSize)
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col := ui.Column(c).Gap(u).AlignItems(ui.Center).Role(ui.RoleMeter).Label(label)
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col.Children(func() {
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if opts.Label != "" {
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ui.Text(c, opts.Label).Font(theme.SerifFont).TextColor(k.TextMuted)
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}
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ui.Box(c).Size(w, w/2+8).Draw(func(p *ui.Painter, r ui.Rect) {
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cx, cy := r.X+r.W/2, r.Y+r.W/2
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outer, inner := r.W/2-2, r.W/2-18
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for i := range 5 {
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a0 := -math.Pi/2 + float64(i)*math.Pi/5
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p.FillPath(internal.Sector(cx, cy, inner, outer, a0+0.012, a0+math.Pi/5-0.012), cols[i])
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}
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a := -math.Pi/2 + value/100*math.Pi
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tx, ty := internal.Polar(cx, cy, inner-6, a)
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var needle ui.Path
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needle.MoveTo(internal.Snap(p, cx), internal.Snap(p, cy)).LineTo(internal.Snap(p, tx), internal.Snap(p, ty))
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p.StrokePath(&needle, 2.5, k.Text)
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p.FillPath(internal.Diamond(internal.Snap(p, cx), internal.Snap(p, cy), 10), k.Text)
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chartText(p, "0", r.X+2, cy+4, size, k.TextMuted, 0, 0)
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chartText(p, "100", r.X+r.W-2, cy+4, size, k.TextMuted, 1, 0)
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})
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ui.Text(c, fmt.Sprintf("%.0f", value)).Font(theme.SerifFont).FontSize(FontSize(c, theme.H1Size)).TextColor(k.Text).FontFeatures("tnum")
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ui.Text(c, word).FontWeight(600).TextColor(cols[band].Mix(k.Text, 0.25))
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})
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return col
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}
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