Added scrolling marquee example

examples/is31fl3731_pillow_marquee.py

@@ -0,0 +1,43 @@
+"""
+Example to scroll some text as a marquee
+
+This example is for use on (Linux) computers that are using CPython with
+Adafruit Blinka to support CircuitPython libraries. CircuitPython does
+not support PIL/pillow (python imaging library)!
+
+Author(s): Melissa LeBlanc-Williams for Adafruit Industries
+"""
+
+import board
+from PIL import Image, ImageDraw, ImageFont
+import adafruit_is31fl3731
+
+SCROLLING_TEXT = "You can display a personal message here..."
+BRIGHTNESS = 64  # Brightness can be between 0-255
+
+i2c = board.I2C()
+
+# uncomment line if you are using Adafruit 16x9 Charlieplexed PWM LED Matrix
+#display = adafruit_is31fl3731.Matrix(i2c)
+# uncomment line if you are using Adafruit 16x9 Charlieplexed PWM LED Matrix
+display = adafruit_is31fl3731.CharlieBonnet(i2c)
+
+# Load a font
+font = ImageFont.truetype('/usr/share/fonts/truetype/dejavu/DejaVuSans.ttf', 8)
+
+# Create an image that contains the text
+text_width, text_height = font.getsize(SCROLLING_TEXT)
+text_image = Image.new('L', (text_width, text_height))
+text_draw = ImageDraw.Draw(text_image)
+text_draw.text((0, 0), SCROLLING_TEXT, font=font, fill=BRIGHTNESS)
+
+# Create an image for the display
+image = Image.new('L', (display.width, display.height))
+draw = ImageDraw.Draw(image)
+
+# Load the text in each frame
+while True:
+    for x in range(text_width + display.width):
+        draw.rectangle((0, 0, display.width, display.height), outline=0, fill=0)
+        image.paste(text_image, (display.width - x, display.height // 2 - text_height // 2 - 1))
+        display.image(image)

examples/is31fl3731_pillow_numbers.py

@@ -13,6 +13,8 @@
 from PIL import Image, ImageDraw, ImageFont
 import adafruit_is31fl3731
 
+BRIGHTNESS = 32  # Brightness can be between 0-255
+
 i2c = board.I2C()
 
 # uncomment line if you are using Adafruit 16x9 Charlieplexed PWM LED Matrix
@@ -32,7 +34,7 @@
 # Load the text in each frame
 for x in range(8):
     draw.rectangle((0, 0, display.width, display.height), outline=0, fill=0)
-    draw.text((x + 1, -2), str(x + 1), font=font, fill=32)
+    draw.text((x + 1, -2), str(x + 1), font=font, fill=BRIGHTNESS)
     display.image(image, frame=x)
 
 display.autoplay(delay=500)