I'm always blocking for midi

waiting_for_midi_code.py

# waiting_for_midi_code.py -- I'm always blocking for midi
# 6 May 2024 - @todbot
# works on PicoDVI RP2040 Feather / DVI Cowbell / etc.
import time, math, random
import board
import displayio
import bitmaptools
from adafruit_display_text import bitmap_label as label

num_colors = 16  # how many colors for our bitmap, can't be over 16 for DVI
circle_detail = 48

display = board.DISPLAY
display.auto_refresh = False
display.root_group = displayio.Group()
dw,dh = display.width, display.height
cx,cy = dw//2, dh//2 

# create a palette of colors to choose from, this one is shades of neon green
import rainbowio
pal = displayio.Palette(num_colors)
pal[0] = 0x000000
for i in range(1,len(pal)):
    pal[i] = rainbowio.colorwheel( 180 + i / num_colors * 55 )
    
bitmap = displayio.Bitmap(dw, dh, num_colors)
tile_grid = displayio.TileGrid(bitmap, pixel_shader=pal)
display.root_group.append(tile_grid)

import terminalio
text = label.Label(font=terminalio.FONT, scale=3, x=15, y=cy, color=0x000000, text="waiting for MIDI")
display.root_group.append(text)


print("cx,cy:", cx,cy)
last_time = 0
while True:
    if time.monotonic() - last_time > 0.05:
        last_time = time.monotonic()
        r = random.randint(10,30) # 20
        x = random.randint(r+1, dw-r-1)
        y = random.randint(r+1, dh-r-1)
        c = random.randint(0,num_colors-1)

        # draw outer circle
        bitmaptools.draw_circle(bitmap, x,y,r,c)
        # draw inner "spokes"
        for i in range(circle_detail):
            angle = math.pi*2 * i / circle_detail
            vx = x + r * math.cos(angle)
            vy = y + r * math.sin(angle)
            bitmaptools.draw_line(bitmap, int(vx), int(vy), x, y, c)

    display.refresh()