Split into category packages; module github.com/ZacharyZhang-NY/MujicaUI

chart/chart_grid_test.go

@@ -0,0 +1,67 @@
+package chart
+
+import (
+	"image/color"
+	"testing"
+
+	"github.com/egoist/mygo/ui"
+
+	"github.com/ZacharyZhang-NY/MujicaUI/core"
+	"github.com/ZacharyZhang-NY/MujicaUI/theme"
+)
+
+func TestChartGridPixelAlignedWithMinor(t *testing.T) {
+	for _, scale := range []float32{1, 2} {
+		tt := ui.NewTester(func(c *ui.Context) {
+			core.Use(c, core.Settings{Mode: core.Light})
+			y := ChartAxis(c, ChartAxisOptions{Side: SideLeft, Min: 0, Max: 100, Ticks: []float64{0, 50, 100}})
+			grid := ChartGrid(c, ChartGridOptions{Y: &y, Minor: 2})
+			ui.Box(c).Fill().Draw(func(p *ui.Painter, r ui.Rect) { grid.Draw(p, ui.Rect{X: 0, Y: 10.3, W: 200, H: 100}) })
+		}, 200, 130)
+		tt.SetScale(scale)
+		img := tt.Image()
+		major, minor := toRGBA(theme.Light().Border), toRGBA(theme.Light().Border.Mix(theme.Light().Surface, 0.55))
+		count := map[color.RGBA]int{}
+		for py := range img.Bounds().Dy() {
+			c := color.RGBAModel.Convert(img.At(100, py)).(color.RGBA)
+			count[c]++
+		}
+		// Three major and two minor lines stay pixel-aligned.
+		if count[major] != 3*int(scale) || count[minor] != 2*int(scale) {
+			t.Fatalf("scale %v: %d major and %d minor pixel rows", scale, count[major], count[minor])
+		}
+	}
+}
+
+func TestChartGridBad(t *testing.T) {
+	for name, build := range map[string]func(c *ui.Context){
+		"no axis": func(c *ui.Context) { ChartGrid(c, ChartGridOptions{}) },
+		"category minor": func(c *ui.Context) {
+			a := ChartAxis(c, ChartAxisOptions{Kind: AxisCategory, Categories: []string{"a"}})
+			ChartGrid(c, ChartGridOptions{X: &a, Minor: 2})
+		},
+	} {
+		func() {
+			defer func() {
+				if recover() == nil {
+					t.Errorf("%s: no panic", name)
+				}
+			}()
+			ui.NewTester(func(c *ui.Context) { core.Use(c, core.Settings{}); build(c) }, 100, 100)
+		}()
+	}
+}
+
+func TestChartGridSnapshot(t *testing.T) {
+	snapshot(t, "chart_grid", 420, 240, func(c *ui.Context) {
+		x := ChartAxis(c, ChartAxisOptions{Min: 0, Max: 10})
+		y := ChartAxis(c, ChartAxisOptions{Side: SideLeft, Kind: AxisLog, Min: 1, Max: 1000})
+		grid := ChartGrid(c, ChartGridOptions{X: &x, Y: &y, Minor: 4})
+		ui.Box(c).Fill().Draw(func(p *ui.Painter, r ui.Rect) {
+			plot := ui.Rect{X: r.X + 48, Y: r.Y + 16, W: r.W - 64, H: r.H - 48}
+			grid.Draw(p, plot)
+			x.Draw(p, plot)
+			y.Draw(p, plot)
+		})
+	})
+}