Charts I: components 101-120

realtime_chart_test.go

@@ -0,0 +1,86 @@
+package mujica
+
+import (
+	"math"
+	"strings"
+	"testing"
+	"time"
+
+	"github.com/egoist/mygo/ui"
+)
+
+var rtStart = time.Date(2026, 10, 5, 9, 0, 0, 0, time.UTC)
+
+func TestRealtimeBufferTrims(t *testing.T) {
+	b := NewRealtimeBuffer(100, "a")
+	for i := range 100_000 {
+		b.Append(rtStart.Add(time.Duration(i)*time.Second), float64(i))
+	}
+	if b.Len() != 100 || len(b.times) >= 200 || b.vals[0][len(b.vals[0])-1] != 99_999 {
+		t.Fatalf("kept %d samples, %d stored", b.Len(), len(b.times))
+	}
+	defer func() {
+		if recover() == nil {
+			t.Fatal("no panic for a sample back in time")
+		}
+	}()
+	b.Append(rtStart, 1)
+}
+
+func TestRealtimeChartWindowAndPause(t *testing.T) {
+	buf := NewRealtimeBuffer(1000, "Bell", "Organ")
+	var st RealtimeChartState
+	values := 0
+	h := &chartHarness{build: func(c *ui.Context) ChartResult {
+		r := RealtimeChart(c, &st, buf, RealtimeChartOptions{Frame: ChartFrame{Label: "Sound"}, Window: 10 * time.Second})
+		if r.ValueChanged() {
+			values++
+		}
+		return r
+	}}
+	tt := ui.NewTester(h.view, 520, 440)
+	if !tt.HasText("No data") {
+		t.Fatalf("empty buffer: %q", tt.Texts())
+	}
+	for i := range 30 {
+		buf.Append(rtStart.Add(time.Duration(i)*time.Second), float64(i), float64(2*i))
+	}
+	tt.Frame()
+	tabTo(t, tt, "Sound")
+	tt.Key(0, ui.KeyHome)
+	if got := chartReadout(tt); got != "2026-10-05 09:00:19 · Bell 19 · Organ 38" {
+		t.Fatalf("window start %q", got)
+	}
+	if err := tt.Click("Pause"); err != nil || !st.Paused || values != 1 {
+		t.Fatalf("pause: %v %v %d", err, st.Paused, values)
+	}
+	for i := 30; i < 40; i++ {
+		buf.Append(rtStart.Add(time.Duration(i)*time.Second), float64(i), 0)
+	}
+	tt.Frame()
+	tabTo(t, tt, "Sound")
+	tt.Key(0, ui.KeyEnd)
+	if got := chartReadout(tt); !strings.HasPrefix(got, "2026-10-05 09:00:29 ·") {
+		t.Fatalf("paused view moved: %q", got)
+	}
+	_ = tt.Click("Resume")
+	tabTo(t, tt, "Sound")
+	tt.Key(0, ui.KeyEnd)
+	if got := chartReadout(tt); !strings.HasPrefix(got, "2026-10-05 09:00:39 ·") || st.Paused {
+		t.Fatalf("resumed view %q", got)
+	}
+}
+
+func TestRealtimeChartSnapshot(t *testing.T) {
+	buf := NewRealtimeBuffer(200, "Bell", "Organ")
+	for i := range 60 {
+		x := float64(i)
+		buf.Append(rtStart.Add(time.Duration(i)*time.Second), 5+3*math.Sin(x/5), 4+2*math.Sin(x/3+1))
+	}
+	snapshot(t, "realtime_chart", 520, 380, func(c *ui.Context) {
+		var st RealtimeChartState
+		ui.Column(c).Padding(16).Children(func() {
+			RealtimeChart(c, &st, buf, RealtimeChartOptions{Frame: ChartFrame{Label: "Sound"}, Window: 30 * time.Second})
+		})
+	})
+}