Split into category packages; module github.com/ZacharyZhang-NY/MujicaUI

feedback/wave_loader.go

@@ -0,0 +1,30 @@
+package feedback
+
+import (
+	"math"
+
+	"github.com/egoist/mygo/ui"
+
+	"github.com/ZacharyZhang-NY/MujicaUI/internal"
+)
+
+// WaveLoader draws a sine line flowing to the right.
+func WaveLoader(c *ui.Context, opts LoaderOptions) *ui.Element {
+	return loaderMark(c, opts, "wave_loader", 2.5, 1400, func(p *ui.Painter, r ui.Rect, t float64, col ui.Color, still bool) {
+		var path ui.Path
+		amp := r.H * 0.3
+		const steps = 24
+		for i := 0; i <= steps; i++ {
+			f := float64(i) / steps
+			x := r.X + r.W*float32(f)
+			y := r.Y + r.H/2 - amp*float32(math.Sin(2*math.Pi*(1.5*f-t)))
+			x, y = internal.Snap(p, x), internal.Snap(p, y)
+			if i == 0 {
+				path.MoveTo(x, y)
+			} else {
+				path.LineTo(x, y)
+			}
+		}
+		p.StrokePath(&path, max(1.5, r.H/10), col)
+	})
+}