WIP motion 1

pulse_loader.go

@@ -0,0 +1,21 @@
+package mujica
+
+import (
+	"github.com/egoist/mygo/ui"
+
+	"mujicaui/internal"
+)
+
+// PulseLoader shows one dot breathing between 60% and full size; never a halo.
+func PulseLoader(c *ui.Context, opts LoaderOptions) *ui.Element {
+	return loaderMark(c, opts, 1, 1600, func(p *ui.Painter, r ui.Rect, t float64, col ui.Color, still bool) {
+		s, a := float32(1), float32(1)
+		if !still {
+			w := loaderWave(t)
+			s, a = 0.6+0.4*w, 0.55+0.45*w
+		}
+		var dot ui.Path
+		dot.Circle(r.X+r.W/2, r.Y+r.H/2, internal.Snap(p, r.H*0.4*s))
+		p.FillPath(&dot, col.Alpha(a))
+	})
+}