Add text components 021-040 with demos and behavior tests

text/blinktext.go

@@ -0,0 +1,25 @@
+package text
+
+import (
+	"github.com/egoist/mygo/ui"
+
+	"git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI/pixel"
+)
+
+type BlinkTextOptions struct {
+	Slot  pixel.Slot
+	Scale int
+	// FPS is blinks per second, times two; zero means 2.
+	FPS int
+}
+
+// BlinkText blinks; under Reduce Motion it stays shown.
+func BlinkText(c *ui.Context, s string, o BlinkTextOptions) *ui.Element {
+	k, sc := pixel.K(c), scale(o.Scale)
+	fps := orDef("BlinkText FPS", o.FPS, 2)
+	return block(c, k, s, pixel.Measure(s)*sc, pixel.LineHeight*sc, func(g pixel.Canvas) {
+		if g.Step(fps)%2 == 0 {
+			g.Text(0, 0, s, o.Slot, sc)
+		}
+	})
+}