new effect!

Former-commit-id: e19975e298

effects/snake.json

@@ -0,0 +1,10 @@
+{
+	"name" : "Snake",
+	"script" : "snake.py",
+	"args" :
+	{
+		"rotation-time" : 10.0,
+		"color" : [255, 0, 0],
+		"percentage" : 25
+	}
+}

effects/snake.py

@@ -0,0 +1,39 @@
+import hyperion
+import time
+import colorsys
+
+# Get the parameters
+rotationTime = float(hyperion.args.get('rotation-time', 10.0))
+color = hyperion.args.get('color', (255,0,0))
+percentage = int(hyperion.args.get('percentage', 10))
+
+# Check parameters
+rotationTime = max(0.1, rotationTime)
+percentage = max(1, min(percentage, 100))
+
+# Initialize the led data
+factor = float(percentage)/100.0
+snakeLeds = int(hyperion.ledCount*factor)
+ledData = bytearray()
+
+for i in range(hyperion.ledCount-snakeLeds):
+	ledData += bytearray((0, 0, 0))
+
+for i in range(1, snakeLeds+1):
+	hsv = colorsys.rgb_to_hsv(float(color[0])/float(255), float(color[1])/float(255), float(color[2])/float(255))
+	rgb = colorsys.hsv_to_rgb(hsv[0], hsv[1], hsv[2]/float(snakeLeds+1-i))
+	ledData += bytearray((int(rgb[0]*255), int(rgb[1]*255), int(rgb[2]*255)))
+
+# Calculate the sleep time and rotation increment
+increment = 3
+sleepTime = rotationTime / hyperion.ledCount
+while sleepTime < 0.05:
+	increment *= 2
+	sleepTime *= 2
+increment %= hyperion.ledCount
+
+# Start the write data loop
+while not hyperion.abort():
+	hyperion.setColor(ledData)
+	ledData = ledData[-increment:] + ledData[:-increment]
+	time.sleep(sleepTime)