WIP charts2 parts 2

chart_export_test.go

@@ -0,0 +1,73 @@
+package mujica
+
+import (
+	"bytes"
+	"image/color"
+	"image/png"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+
+	"mujicaui/theme"
+)
+
+func TestChartExportPNGInTheme(t *testing.T) {
+	for _, mode := range []Mode{Light, Dark} {
+		var out []byte
+		ui.NewTester(func(c *ui.Context) {
+			Use(c, Settings{Mode: mode})
+			if out != nil {
+				return
+			}
+			b, err := ChartExport(c, func(c *ui.Context) {
+				BarChart(c, barCats, barSeries(), BarChartOptions{Frame: ChartFrame{Label: "Tithes", Height: 160}})
+			}, ChartExportOptions{Width: 300, Height: 220, Scale: 1.5})
+			if err != nil {
+				t.Fatal(err)
+			}
+			out = b
+		}, 100, 100)
+		img, err := png.Decode(bytes.NewReader(out))
+		if err != nil {
+			t.Fatal(err)
+		}
+		if b := img.Bounds(); b.Dx() != 450 || b.Dy() != 330 {
+			t.Fatalf("%v: size %v", mode, b)
+		}
+		k := theme.Light()
+		if mode == Dark {
+			k = theme.Dark()
+		}
+		if got := color.RGBAModel.Convert(img.At(3, 3)).(color.RGBA); got != toRGBA(k.Surface) {
+			t.Fatalf("%v: corner %v, want the theme's Surface", mode, got)
+		}
+	}
+}
+
+func TestChartExportBad(t *testing.T) {
+	defer func() {
+		if recover() == nil {
+			t.Fatal("no panic for a zero size")
+		}
+	}()
+	ui.NewTester(func(c *ui.Context) {
+		Use(c, Settings{})
+		_, _ = ChartExport(c, func(*ui.Context) {}, ChartExportOptions{})
+	}, 100, 100)
+}
+
+func TestChartExportSnapshot(t *testing.T) {
+	snapshot(t, "chart_export", 340, 300, func(c *ui.Context) {
+		b, err := ChartExport(c, func(c *ui.Context) {
+			PieChart(c, pieSlices, PieChartOptions{Frame: ChartFrame{Label: "Stores", Height: 150}, Donut: true, MinAngle: 20})
+		}, ChartExportOptions{Width: 300, Height: 260, Scale: 1})
+		if err != nil {
+			t.Fatal(err)
+		}
+		bmp, err := ui.DecodeBitmap(b)
+		if err != nil {
+			t.Fatal(err)
+		}
+		ui.Column(c).Padding(20).Children(func() { ui.Image(c, bmp).Size(300, 260) })
+	})
+}