simple "generative art" using CircuitPython and displayio.Bitmap

bitmaplines.py

# bitmaplines.py -- simple "generative art" using CircuitPython and displayio.Bitmap
# 22 Sep 2022 - @todbot / Tod Kurt, from @jedgarpark's 22 Sep 2022 CircuitPython Parsec
# Video: https://youtu.be/5TFOlvQUbn8
import board, displayio, time
import random

display = board.DISPLAY

num_colors = 5
bitmap = displayio.Bitmap( display.width, display.height, num_colors )
palette = displayio.Palette(num_colors)
tilegrid = displayio.TileGrid(bitmap,pixel_shader=palette)
maingroup = displayio.Group()
maingroup.append(tilegrid)
display.show(maingroup)

palette[0] = 0x000000 # black
palette[1] = 0xFF0000 # red
palette[2] = 0x0000FF # blue
palette[3] = 0xFF00FF # purple
palette[4] = 0x00FF00 # green

def draw_hline(x,y,length, color):
    for i in range(length):
        bitmap[x+i, y] = c

def draw_vline(x,y,length, color):
    for i in range(length):
        bitmap[x, y+i] = c

llen = 20
while True:
    x, y = random.randint(0,display.width-llen), random.randint(0,display.height-llen)
    c = random.randint(0,len(palette)-1)
    draw_hline(x,y, llen, c)
    draw_vline(x,y, llen, c)

video demo:

https://www.youtube.com/watch?v=5TFOlvQUbn8