light clock (#260)

* extend image effects
add a basic light clock

* add alpha values  to rainbow

* some effect tuning

* make seconds hand optional and change color to yellow
make blue hours hand always visible

effects/light-clock.py

@@ -0,0 +1,54 @@
+import hyperion, time, datetime
+
+# Get the parameters
+showSeconds = bool(hyperion.args.get('show_seconds', True))
+centerX     = int(round(hyperion.imageWidth)/2)
+centerY     = int(round(float(hyperion.imageHeight)/2))
+
+colorsSecond = bytearray([
+	0, 255,255,0,255,
+	5, 255,255,0,255,
+	30, 0,0,0,0,
+])
+
+colorsMinute = bytearray([
+	0, 0,255,0,255,
+	5, 0,255,0,250,
+	90, 0,0,0,0,
+	
+])
+
+colorsHour = bytearray([
+	0, 0,0,255,255,
+	10, 0,0,255,255,
+	127, 0,0,196,127,
+	255, 0,0,196,5,
+])
+
+colorsHourTop = bytearray([
+	0, 0,0,255,250,
+	10, 0,0,255,128,
+	20, 0,0,0,0,
+])
+
+# effect loop
+while not hyperion.abort():
+	now = datetime.datetime.now()
+
+	angleH = 449 - 30*(now.hour if now.hour<12 else now.hour-12)
+	angleM = 449 - 6*now.minute
+	angleS = 449 - 6*now.second
+
+	angleH -= 0 if angleH<360 else 360
+	angleM -= 0 if angleM<360 else 360
+	angleS -= 0 if angleS<360 else 360
+
+	hyperion.imageSolidFill(127,127,127);
+	hyperion.imageCanonicalGradient(centerX, centerY, angleH, colorsHour)
+	hyperion.imageCanonicalGradient(centerX, centerY, angleM, colorsMinute)
+	hyperion.imageCanonicalGradient(centerX, centerY, angleH, colorsHourTop)
+	if showSeconds:
+		hyperion.imageCanonicalGradient(centerX, centerY, angleS, colorsSecond)
+
+	hyperion.imageShow()
+	time.sleep(0.01 )