Add text components 021-040 with demos and behavior tests

text/outlinetext.go

@@ -0,0 +1,27 @@
+package text
+
+import (
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type OutlineTextOptions struct {
+	// Slot is the fill; zero means Lit.
+	Slot  pixel.Slot
+	Scale int
+}
+
+// OutlineText rings every glyph dot of s with Edge.
+func OutlineText(c *ui.Context, s string, o OutlineTextOptions) *ui.Element {
+	k, sc := pixel.K(c), scale(o.Scale)
+	fill := slotOr(o.Slot, pixel.Lit)
+	return block(c, k, s, pixel.Measure(s)*sc+2, pixel.LineHeight*sc+2, func(g pixel.Canvas) {
+		for dy := -1; dy <= 1; dy++ {
+			for dx := -1; dx <= 1; dx++ {
+				g.Text(1+dx, 1+dy, s, pixel.Edge, sc)
+			}
+		}
+		g.Text(1, 1, s, fill, sc)
+	})
+}