Charts I: components 101-120

pie_chart_test.go

@@ -0,0 +1,82 @@
+package mujica
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+)
+
+var pieSlices = []ChartSlice{{"Wax", 50}, {"Oil", 30}, {"Myrrh", 12}, {"Salt", 4}, {"Ash", 4}}
+
+func TestPieMerge(t *testing.T) {
+	got := pieMerge(pieSlices, 20, "Other")
+	if fmt.Sprint(got) != "[{Wax 50} {Oil 30} {Myrrh 12} {Other 8}]" {
+		t.Fatalf("merge 20°: %v", got)
+	}
+	if got := pieMerge(pieSlices[:4], 20, "Other"); len(got) != 4 {
+		t.Fatalf("a single narrow slice merged: %v", got)
+	}
+}
+
+func TestPieChartReadoutAndHover(t *testing.T) {
+	h := &chartHarness{build: func(c *ui.Context) ChartResult {
+		return PieChart(c, pieSlices, PieChartOptions{Frame: ChartFrame{Label: "Stores"}, Donut: true, MinAngle: 20})
+	}}
+	tt := ui.NewTester(h.view, 520, 420)
+	if !tt.HasText("Other") {
+		t.Fatalf("legend lacks Other: %q", tt.Texts())
+	}
+	tabTo(t, tt, "Stores")
+	tt.Key(0, ui.KeyEnd)
+	if got := chartReadout(tt); got != "Other · 8 · 8.0%" {
+		t.Fatalf("readout %q", got)
+	}
+	b := h.res.Element.Bounds()
+	plotTop := b.Y + 38 // below the one-line legend
+	cy := plotTop + 120
+	tt.Move(b.X+b.W/2+60, cy-40) // upper right: the first slice
+	if got := chartReadout(tt); got != "Wax · 50 · 50.0%" {
+		t.Fatalf("hover %q", got)
+	}
+	tt.Key(0, ui.KeyEscape)
+	tt.Move(b.X+b.W/2, cy) // the hole
+	if h.res.Point != -1 {
+		t.Fatalf("hole picked %d", h.res.Point)
+	}
+}
+
+func TestPieChartBad(t *testing.T) {
+	for _, s := range [][]ChartSlice{{{"a", -1}}, {{"", 1}}} {
+		func() {
+			defer func() {
+				if recover() == nil {
+					t.Errorf("%v: no panic", s)
+				}
+			}()
+			ui.NewTester(func(c *ui.Context) {
+				Use(c, Settings{})
+				PieChart(c, s, PieChartOptions{Frame: ChartFrame{Label: "x"}})
+			}, 300, 300)
+		}()
+	}
+	h := &chartHarness{build: func(c *ui.Context) ChartResult {
+		return PieChart(c, []ChartSlice{{"a", 0}}, PieChartOptions{Frame: ChartFrame{Label: "x"}})
+	}}
+	if tt := ui.NewTester(h.view, 300, 300); !tt.HasText("No data") {
+		t.Fatal("zero total is not empty")
+	}
+}
+
+func TestPieChartSnapshot(t *testing.T) {
+	snapshot(t, "pie_chart", 640, 320, func(c *ui.Context) {
+		ui.Row(c).Padding(16).Gap(16).Children(func() {
+			ui.Column(c).Width(296).Children(func() {
+				PieChart(c, pieSlices, PieChartOptions{Frame: ChartFrame{Label: "Pie", Height: 220}})
+			})
+			ui.Column(c).Width(296).Children(func() {
+				PieChart(c, pieSlices, PieChartOptions{Frame: ChartFrame{Label: "Donut", Height: 220}, Donut: true, MinAngle: 20})
+			})
+		})
+	})
+}