Add canvas, dither, sprites, clock and pixel elements

pixel/engine_internal_test.go

@@ -0,0 +1,79 @@
+package pixel
+
+import (
+	"slices"
+	"testing"
+	"time"
+
+	"github.com/egoist/mygo/ui"
+)
+
+func TestRuns(t *testing.T) {
+	cases := map[string][][2]int{
+		"##..###.#": {{0, 2}, {4, 7}, {8, 9}},
+		"....":      nil,
+		"####":      {{0, 4}},
+		".#.#":      {{1, 2}, {3, 4}},
+	}
+	for pat, want := range cases {
+		var got [][2]int
+		runs(len(pat), func(i int) bool { return pat[i] == '#' }, func(i, j int) { got = append(got, [2]int{i, j}) })
+		if !slices.Equal(got, want) {
+			t.Errorf("runs(%q) = %v, want %v", pat, got, want)
+		}
+	}
+}
+
+func TestTextLinesEllipsis(t *testing.T) {
+	cases := []struct {
+		s        string
+		width, n int
+		want     []string
+	}{
+		{"one\ntwo\nthree", 0, 2, []string{"one", "two…"}},
+		{"one\ntwo", 0, 2, []string{"one", "two"}},
+		{"hello world again", Measure("hello…"), 1, []string{"hello…"}},
+		{"hello world again", Measure("hel…"), 1, []string{"hel…"}},
+		{"像素风格组件库", 36, 2, []string{"像素风", "格组…"}},
+	}
+	for _, c := range cases {
+		if got := textLines(c.s, c.width, c.n); !slices.Equal(got, c.want) {
+			t.Errorf("textLines(%q, %d, %d) = %q, want %q", c.s, c.width, c.n, got, c.want)
+		}
+	}
+}
+
+type fakePainter struct{ fills int }
+
+func (f *fakePainter) Fill(ui.Rect, ui.Color, float32) { f.fills++ }
+func (f *fakePainter) After(time.Duration)             {}
+func (f *fakePainter) Now() time.Time                  { return time.Unix(0, 0) }
+
+func TestDrawingMergesRuns(t *testing.T) {
+	sp := MustSprite("aab\n.bb")
+	cases := []struct {
+		name string
+		draw func(g Canvas)
+		want int
+	}{
+		{"text A", func(g Canvas) { g.Text(0, 0, "A", Ink, 1) }, 15},
+		{"text A ×2", func(g Canvas) { g.Text(0, 0, "A", Ink, 2) }, 15},
+		{"micro 1", func(g Canvas) { g.Micro(0, 0, "1", Ink, 1) }, 5},
+		{"sprite", func(g Canvas) { g.Sprite(0, 0, sp, 0, Ink, 1) }, 3},
+		{"flat line", func(g Canvas) { g.Line(0, 0, 9, 0, Ink) }, 1},
+		{"steep line", func(g Canvas) { g.Line(0, 0, 0, 9, Ink) }, 1},
+		{"diagonal", func(g Canvas) { g.Line(0, 0, 9, 9, Ink) }, 10},
+		{"circle 3", func(g Canvas) { g.Circle(3, 3, 3, Ink) }, 12},
+		{"disc 3", func(g Canvas) { g.Disc(3, 3, 3, Ink) }, 7},
+		{"dither 0", func(g Canvas) { g.Dither(0, 0, 4, 4, Face, Ink, 0) }, 1},
+		{"dither 8", func(g Canvas) { g.Dither(0, 0, 4, 4, Face, Ink, 8) }, 9},
+		{"dither 16", func(g Canvas) { g.Dither(0, 0, 4, 4, Face, Ink, 16) }, 1},
+	}
+	for _, c := range cases {
+		f := &fakePainter{}
+		c.draw(Canvas{p: f, k: Kit{pal: SpringDay, dot: 1}, W: 32, H: 32})
+		if f.fills != c.want {
+			t.Errorf("%s: %d fills, want %d", c.name, f.fills, c.want)
+		}
+	}
+}