13x9 is31fl3741 scrolling bitmap text

13x9_scrolling_text.py

# SPDX-FileCopyrightText: 2023 anecdata
#
# SPDX-License-Identifier: Unlicense

import time
import board
import busio
from displayio import Bitmap
import adafruit_is31fl3741
from adafruit_is31fl3741.adafruit_rgbmatrixqt import Adafruit_RGBMatrixQT
from adafruit_display_text.bitmap_label import Label
from adafruit_bitmap_font import bitmap_font

i2c = busio.I2C(board.SCL, board.SDA, frequency=1_000_000)
is31 = Adafruit_RGBMatrixQT(i2c, allocate=adafruit_is31fl3741.PREFER_BUFFER)
is31.set_led_scaling(0xFF)
is31.global_current = 0xFF
is31.enable = True

font = bitmap_font.load_font("tom-thumb.pcf", Bitmap)
label = Label(text="    Hello World!", font=font)
bitmap = label.bitmap
while True:
    for i in range(bitmap.width):
        for x in range(13):
            for y in range(9):
                if y < bitmap.height and i < bitmap.width - x:
                    is31.pixel(x, y + 2, 0xffffff * bitmap[x + i, y])
        is31.show()

Adapted from example at https://learn.adafruit.com/adafruit-5x5-neopixel-grid-bff/circuitpython