1 files changed, 42 insertions, 0 deletions
diff --git a/pkg/draw/braille.go b/pkg/draw/braille.go
new file mode 100644
index 0000000..33b238e
--- /dev/null
+++ b/pkg/draw/braille.go
@@ -0,0 +1,42 @@
+package draw
+
+var _ Pixels = &Braille{}
+
+const (
+	brailleScaleX = 2
+	brailleScaleY = 4
+	brailleEmpty  = rune(0x2800)
+)
+
+type Braille struct{ *Buffer }
+
+func (b *Braille) Size() Box {
+	return Box{
+		Width:  b.Width * brailleScaleX,
+		Height: b.Height * brailleScaleY,
+	}
+}
+
+func (b *Braille) Clear() { b.Fill(brailleEmpty) }
+
+func (b *Braille) Set(y, x int) {
+	ry := y / brailleScaleY
+	rx := x / brailleScaleX
+	b.SetOr(ry, rx, braillePoint(y, x))
+}
+
+func braillePoint(y, x int) rune {
+	var cy, cx int
+	if y >= 0 {
+		cy = y % 4
+	} else {
+		cy = 3 + ((y + 1) % 4)
+	}
+	if x >= 0 {
+		cx = x % 2
+	} else {
+		cx = 1 + ((x + 1) % 2)
+	}
+	pixelMap := [4][2]rune{{1, 8}, {2, 16}, {4, 32}, {64, 128}}
+	return pixelMap[3-cy][cx]
+}