Knight rider effect added

Former-commit-id: a475270b89e3caf156e011ee1e49a745d03b2e3a

effects/knight-rider.py

@@ -0,0 +1,45 @@
+import hyperion 
+import time 
+import colorsys
+
+# Get the rotation time
+speed = hyperion.args.get('speed', 1.0)
+fadeFactor = hyperion.args.get('fadeFactor', 0.7)
+
+# Initialize the led data
+width = 25
+imageData = bytearray(width * (0,0,0))
+imageData[0] = 255
+
+# Calculate the sleep time and rotation increment
+increment = 1
+sleepTime = 1.0 / (speed * width)
+while sleepTime < 0.05:
+	increment *= 2
+	sleepTime *= 2
+
+# Start the write data loop
+position = 0
+direction = 1
+while not hyperion.abort():
+	hyperion.setImage(width, 1, imageData)
+
+	# Move data into next state
+	for i in range(increment):
+		position += direction
+		if position == -1:
+			position = 1
+			direction = 1
+		elif position == width:
+			position = width-2
+			direction = -1
+
+		# Fade the old data
+		for j in range(width):
+			imageData[3*j] = int(fadeFactor * imageData[3*j])
+
+		# Insert new data
+		imageData[3*position] = 255
+		
+	# Sleep for a while
+	time.sleep(sleepTime)