add Pac-Man effect (#382)

effects/pacman.json

@@ -0,0 +1,4 @@
+{
+	"name" : "Pac-Man",
+	"script" : "pacman.py"
+}

effects/pacman.py

@@ -0,0 +1,81 @@
+import hyperion
+import time
+import colorsys
+from random import randint
+
+# define pacman
+pacman = bytearray((255, 255, 1))
+
+# define ghosts
+redGuy = bytearray((255, 0, 0))
+pinkGuy = bytearray((255, 184, 255))
+blueGuy = bytearray((0, 255, 255))
+slowGuy = bytearray((255, 184, 81))
+
+light = bytearray((255, 184, 174))
+background = bytearray((0, 0, 0))
+
+# initialize the led data
+ledDataEscape = bytearray()
+for i in range(hyperion.ledCount):
+	if i == 1:
+		ledDataEscape += pacman
+	elif i == 7:
+		ledDataEscape += pinkGuy
+	elif i == 10:
+		ledDataEscape += blueGuy
+	elif i == 13:
+		ledDataEscape += slowGuy
+	elif i == 16:
+		ledDataEscape += redGuy
+	else:
+		ledDataEscape += background
+
+ledDataChase = bytearray()
+for i in range(hyperion.ledCount):
+	if i == 1:
+		ledDataChase += pacman
+	elif i in [7, 10, 13, 16]:
+		ledDataChase += bytearray((33, 33, 255))
+	else:
+		ledDataChase += background
+
+# increment = 3, because LED-Color is defined by 3 Bytes
+increment = 3
+sleepTime = 0.3
+
+def shiftLED(ledData, increment, limit, lightPos=None):
+	state = 0
+	while state < limit and not hyperion.abort():
+		ledData = ledData[increment:] + ledData[:increment]
+
+		if (lightPos):
+			tmp = ledData[lightPos]
+			ledData[lightPos] = light
+
+		hyperion.setColor(ledData)
+
+		if (lightPos):
+			ledData[lightPos] = tmp
+
+		time.sleep(sleepTime)
+		state += 1
+
+# start the write data loop
+while not hyperion.abort():
+
+	# escape mode
+	ledData = ledDataEscape
+	shiftLED(ledData, increment, hyperion.ledCount)
+
+	random = randint(10,hyperion.ledCount)
+
+	# escape mode + power pellet
+	s = slice(3*random, 3*random+3)
+	shiftLED(ledData, increment, hyperion.ledCount - random, s)
+
+	# chase mode
+	shift = 3*(hyperion.ledCount - random)
+	ledData=ledDataChase[shift:]+ledDataChase[:shift]
+	shiftLED(ledData, -increment, 2*hyperion.ledCount-random)
+