wip-c2-3

density_plot_test.go

@@ -0,0 +1,89 @@
+package mujica
+
+import (
+	"math"
+	"strings"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+)
+
+func densityGroups() []BoxGroup {
+	a, b := make([]float64, 200), make([]float64, 200)
+	for i := range a {
+		u := float64(i)/200 - 0.5
+		a[i] = 40 + 30*u*math.Abs(u)
+		b[i] = 60 + 12*math.Sin(float64(i))
+	}
+	return []BoxGroup{{Name: "Matins", Values: a}, {Name: "Vespers", Values: b}}
+}
+
+func TestDensityKDEIntegratesToOne(t *testing.T) {
+	v := []float64{1, 2, 2, 3, 7}
+	xs := make([]float64, 2001)
+	for i := range xs {
+		xs[i] = -10 + 30*float64(i)/2000
+	}
+	d := densityKDE(v, densityBandwidth(v), xs)
+	sum := 0.0
+	for _, y := range d {
+		sum += y * 30 / 2000
+	}
+	if math.Abs(sum-1) > 0.01 {
+		t.Fatalf("density integrates to %v", sum)
+	}
+	if bw := densityBandwidth([]float64{4, 4}); bw != 1 {
+		t.Fatalf("flat bandwidth %v", bw)
+	}
+}
+
+func TestDensityPlotReadoutAndBandwidth(t *testing.T) {
+	bw := 0.0
+	h := &chartHarness{build: func(c *ui.Context) ChartResult {
+		return DensityPlot(c, densityGroups(), DensityPlotOptions{Frame: ChartFrame{Label: "Ages"}, Bandwidth: bw, Points: 64})
+	}}
+	tt := ui.NewTester(h.view, 520, 420)
+	tabTo(t, tt, "Ages")
+	tt.Key(0, ui.KeyRight)
+	for range 31 {
+		tt.Key(0, ui.KeyRight)
+	}
+	first := chartReadout(tt)
+	if !strings.Contains(first, "Matins ") || !strings.Contains(first, "Vespers ") {
+		t.Fatalf("readout %q", first)
+	}
+	bw = 1
+	tt.Frame()
+	if chartReadout(tt) == first {
+		t.Fatal("bandwidth did not change the curve")
+	}
+	if err := tt.Click("Vespers"); err != nil || strings.Contains(chartReadout(tt), "Vespers") {
+		t.Fatalf("legend did not hide a group: %q", chartReadout(tt))
+	}
+}
+
+func TestDensityPlotBadAndEmpty(t *testing.T) {
+	h := &chartHarness{build: func(c *ui.Context) ChartResult {
+		return DensityPlot(c, []BoxGroup{{Name: "a", Values: []float64{math.NaN()}}}, DensityPlotOptions{Frame: ChartFrame{Label: "Ages"}})
+	}}
+	if tt := ui.NewTester(h.view, 520, 420); !tt.HasText("No data") {
+		t.Fatal("NaN sample is not empty")
+	}
+	defer func() {
+		if recover() == nil {
+			t.Fatal("no panic for Points 1")
+		}
+	}()
+	ui.NewTester(func(c *ui.Context) {
+		Use(c, Settings{})
+		DensityPlot(c, densityGroups(), DensityPlotOptions{Frame: ChartFrame{Label: "x"}, Points: 1})
+	}, 300, 300)
+}
+
+func TestDensityPlotSnapshot(t *testing.T) {
+	snapshot(t, "density_plot", 520, 340, func(c *ui.Context) {
+		ui.Column(c).Padding(16).Children(func() {
+			DensityPlot(c, densityGroups(), DensityPlotOptions{Frame: ChartFrame{Label: "Ages"}})
+		})
+	})
+}