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code.py
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code.py
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# SPDX-FileCopyrightText: 2020 Jeff Epler for Adafruit Industries
#
# SPDX-License-Identifier: MIT
# This example implements a rainbow colored scroller, in which each letter
# has a different color. This is not possible with
# Adafruit_Circuitpython_Display_Text, where each letter in a label has the
# same color
#
# This demo also supports only ASCII characters and the built-in font.
# See the simple_scroller example for one that supports alternative fonts
# and characters, but only has a single color per label.
import array
from rainbowio import colorwheel
import board
import displayio
import framebufferio
import rgbmatrix
import terminalio
displayio.release_displays()
matrix = rgbmatrix.RGBMatrix(
width=64, height=32, bit_depth=3,
rgb_pins=[board.D6, board.D5, board.D9, board.D11, board.D10, board.D12],
addr_pins=[board.A5, board.A4, board.A3, board.A2],
clock_pin=board.D13, latch_pin=board.D0, output_enable_pin=board.D1)
display = framebufferio.FramebufferDisplay(matrix, auto_refresh=False)
# Create a tilegrid with a bunch of common settings
def tilegrid(palette):
return displayio.TileGrid(
bitmap=terminalio.FONT.bitmap, pixel_shader=palette,
width=1, height=1, tile_width=6, tile_height=12, default_tile=32)
g = displayio.Group()
# We only use the built in font which we treat as being 7x14 pixels
linelen = (64//7)+2
# prepare the main groups
l1 = displayio.Group()
l2 = displayio.Group()
g.append(l1)
g.append(l2)
display.root_group = g
l1.y = 1
l2.y = 16
# Prepare the palettes and the individual characters' tiles
sh = [displayio.Palette(2) for _ in range(linelen)]
tg1 = [tilegrid(shi) for shi in sh]
tg2 = [tilegrid(shi) for shi in sh]
# Prepare a fast map from byte values to
charmap = array.array('b', [terminalio.FONT.get_glyph(32).tile_index]) * 256
for ch in range(256):
glyph = terminalio.FONT.get_glyph(ch)
if glyph is not None:
charmap[ch] = glyph.tile_index
# Set the X coordinates of each character in label 1, and add it to its group
for idx, gi in enumerate(tg1):
gi.x = 7 * idx
l1.append(gi)
# Set the X coordinates of each character in label 2, and add it to its group
for idx, gi in enumerate(tg2):
gi.x = 7 * idx
l2.append(gi)
# These pairs of lines should be the same length
lines = [
b"This scroller is brought to you by CircuitPython & PROTOMATTER",
b" .... . .-.. .-.. --- / .--. .-. --- - --- -- .- - - . .-.",
b"Greetz to ... @PaintYourDragon @v923z @adafruit ",
b" @danh @ladyada @kattni @tannewt all showers & tellers",
b"New York Strong Wash Your Hands ",
b" Flatten the curve Stronger Together",
]
even_lines = lines[0::2]
odd_lines = lines[1::2]
# Scroll a top text and a bottom text
def scroll(t, b):
# Add spaces to the start and end of each label so that it goes from
# the far right all the way off the left
sp = b' ' * linelen
t = sp + t + sp
b = sp + b + sp
maxlen = max(len(t), len(b))
# For each whole character position...
for i in range(maxlen-linelen):
# Set the letter displayed at each position, and its color
for j in range(linelen):
sh[j][1] = colorwheel(3 * (2*i+j))
tg1[j][0] = charmap[t[i+j]]
tg2[j][0] = charmap[b[i+j]]
# And then for each pixel position, move the two labels
# and then refresh the display.
for j in range(7):
l1.x = -j
l2.x = -j
display.refresh(minimum_frames_per_second=0)
# Repeatedly scroll all the pairs of lines
while True:
for e, o in zip(even_lines, odd_lines):
scroll(e, o)