Analog clock widget!!

elements/fun/clock.go

@@ -0,0 +1,88 @@
+package fun
+
+import "time"
+import "math"
+import "image"
+import "git.tebibyte.media/sashakoshka/tomo"
+import "git.tebibyte.media/sashakoshka/tomo/theme"
+import "git.tebibyte.media/sashakoshka/tomo/artist"
+import "git.tebibyte.media/sashakoshka/tomo/elements/core"
+
+type AnalogClock struct {
+	*core.Core
+	core core.CoreControl
+	time time.Time
+}
+
+func NewAnalogClock (newTime time.Time) (element *AnalogClock) {
+	element = &AnalogClock { }
+	element.Core, element.core = core.NewCore(element)
+	element.core.SetMinimumSize(64, 64)
+	return
+}
+
+func (element *AnalogClock) Handle (event tomo.Event) {
+	switch event.(type) {
+	case tomo.EventResize:
+		resizeEvent := event.(tomo.EventResize)
+		element.core.AllocateCanvas (
+			resizeEvent.Width,
+			resizeEvent.Height)
+		element.draw()
+	}
+}
+
+func (element *AnalogClock) SetTime (newTime time.Time) {
+	if newTime == element.time { return }
+	element.time = newTime
+	if element.core.HasImage() {
+		element.draw()
+		element.core.PushAll()
+	}
+}
+
+func (element *AnalogClock) draw () {
+	bounds := element.core.Bounds()
+
+	artist.ChiseledRectangle (
+		element.core,
+		theme.BackgroundProfile(true),
+		bounds)
+
+	for hour := 0; hour < 12; hour ++ {
+		element.radialLine (
+			theme.ForegroundImage(),
+			0.8, 0.9, float64(hour) / 6 * math.Pi)
+	}
+
+	element.radialLine (
+		theme.ForegroundImage(),
+		0, 0.5, float64(element.time.Hour() - 3) / 6 * math.Pi)
+	element.radialLine (
+		theme.ForegroundImage(),
+		0, 0.7, float64(element.time.Minute() - 15) / 30 * math.Pi)
+	element.radialLine (
+		theme.AccentImage(),
+		0, 0.7, float64(element.time.Second() - 15) / 30 * math.Pi)
+	// TODO: engraved background, draw lines with std foreground, draw the
+	// second hand with the accent color.
+}
+
+func (element *AnalogClock) radialLine (
+	source tomo.Image,
+	inner  float64,
+	outer  float64,
+	radian float64,
+) {
+	bounds := element.core.Bounds()
+	width  := float64(bounds.Dx()) / 2
+	height := float64(bounds.Dy()) / 2
+	min := image.Pt (
+		int(math.Cos(radian) * inner * width + width),
+		int(math.Sin(radian) * inner * height + height))
+	max := image.Pt (
+		int(math.Cos(radian) * outer * width + width),
+		int(math.Sin(radian) * outer * height + height))
+	// println(min.String(), max.String())
+	artist.Line(element.core, source, 1, min, max)
+}