WIP components (as built)

uptime_bar.go

@@ -9,7 +9,7 @@ import (
 	"mujicaui/internal"
 )
 
-// UptimeDay is one day's availability, 0 to 1; NaN means no data.
+// UptimeDay holds availability; NaN marks missing data.
 type UptimeDay struct {
 	Date   Date
 	Uptime float64
@@ -20,11 +20,11 @@ type UptimeDay struct {
 // UptimeBarOptions configure an UptimeBar; Frame.Height 0 means 36.
 type UptimeBarOptions struct {
 	Frame ChartFrame
-	// Degraded and Down are the uptime limits below which a day is marked; zero means 0.999 and 0.95.
+	// Degraded and Down default to 0.999 and 0.95.
 	Degraded, Down float64
 }
 
-// UptimeBar draws one bar per day by availability; hover or arrows read a day's detail.
+// UptimeBar shows daily availability with pointer and keyboard readouts.
 func UptimeBar(c *ui.Context, days []UptimeDay, opts UptimeBarOptions) ChartResult {
 	deg, down := opts.Degraded, opts.Down
 	if deg == 0 {
@@ -36,17 +36,22 @@ func UptimeBar(c *ui.Context, days []UptimeDay, opts UptimeBarOptions) ChartResu
 	if !(down < deg && deg <= 1 && down > 0) {
 		panic("mujica: UptimeBar needs 0 < Down < Degraded <= 1")
 	}
-	for i, d := range days {
-		if !math.IsNaN(d.Uptime) && (d.Uptime < 0 || d.Uptime > 1) {
-			panic(fmt.Sprintf("mujica: UptimeBar day %d uptime %v outside 0..1", i, d.Uptime))
-		}
-	}
+
 	if opts.Frame.Height == 0 {
 		opts.Frame.Height = 36
 	}
 	k := Tokens(c)
 	ch := newChart(c, opts.Frame)
 	n := len(days)
+	cache := ui.Local(ch.res.Element, "mujica.uptime", func() uptimeCache { return uptimeCache{} })
+	if cache.key != chartID(days) {
+		for i, d := range days {
+			if !math.IsNaN(d.Uptime) && (d.Uptime < 0 || d.Uptime > 1) {
+				panic(fmt.Sprintf("mujica: UptimeBar day %d outside 0..1", i))
+			}
+		}
+		cache.key, cache.width = chartID(days), -1
+	}
 	band := func(r ui.Rect) internal.Band { return internal.Band{N: n, R0: r.X, R1: r.X + r.W, Pad: 0.25} }
 	level := func(v float64) int { // 0 ok, 1 degraded, 2 down, 3 no data
 		switch {
@@ -59,19 +64,27 @@ func UptimeBar(c *ui.Context, days []UptimeDay, opts UptimeBarOptions) ChartResu
 		}
 		return 0
 	}
+	pal := internal.Palette(k)
 	words := [...]string{msg(c, "uptime_bar.ok"), msg(c, "uptime_bar.degraded"), msg(c, "uptime_bar.down"), msg(c, "uptime_bar.nodata")}
 	res, _ := ch.build(chartSpec{
 		n: n,
 		draw: func(p *ui.Painter, r ui.Rect, active int) {
 			b := band(r)
-			for i, d := range days {
-				x, w := internal.Snap(p, b.Start(i)), max(b.Width(), 1)
+			cache.prepare(days, max(1, int(math.Ceil(float64(r.W*p.Scale())))))
+			for _, slot := range cache.slots {
+				d := days[slot.index]
+				x, w := internal.Snap(p, b.Start(slot.first)), max(b.Start(slot.last)+b.Width()-b.Start(slot.first), 1)
 				lv := level(d.Uptime)
-				col := [...]ui.Color{k.Success, k.Warning, k.Danger, k.Border}[lv]
-				// Shorter bars mark bad days, so color is not the only cue.
+				col := [...]ui.Color{pal[2], pal[3], k.Danger, k.TextMuted}[lv]
+				// Shorter bars distinguish degraded days and outages.
 				h := r.H * [...]float32{1, 0.75, 0.5, 1}[lv]
-				p.Fill(ui.Rect{X: x, Y: r.Y + r.H - h, W: w, H: h}, col, 1)
-				if i == active {
+				bar := ui.Rect{X: x, Y: r.Y + r.H - h, W: w, H: h}
+				if lv == 3 {
+					p.Stroke(bar, col, 1, 1)
+				} else {
+					p.Fill(bar, col, 1)
+				}
+				if active >= slot.first && active <= slot.last {
 					p.Stroke(ui.Rect{X: x - 2, Y: r.Y - 2, W: w + 4, H: r.H + 4}, k.Focus, 2, 1.5)
 				}
 			}
@@ -94,3 +107,29 @@ func UptimeBar(c *ui.Context, days []UptimeDay, opts UptimeBarOptions) ChartResu
 	})
 	return res
 }
+
+type uptimeSlot struct{ first, last, index int }
+type uptimeCache struct {
+	key   string
+	width int
+	slots []uptimeSlot
+}
+
+func (s *uptimeCache) prepare(days []UptimeDay, width int) {
+	if s.width == width {
+		return
+	}
+	s.width, s.slots = width, s.slots[:0]
+	n := len(days)
+	for first := 0; first < n; {
+		last := min(n-1, max(first, ((first*width/n+1)*n-1)/width))
+		index := first
+		for i := first + 1; i <= last; i++ {
+			if math.IsNaN(days[index].Uptime) || !math.IsNaN(days[i].Uptime) && days[i].Uptime < days[index].Uptime {
+				index = i
+			}
+		}
+		s.slots = append(s.slots, uptimeSlot{first, last, index})
+		first = last + 1
+	}
+}