"""
   RGB-LED-Würfel mit 8x8-Neopixel-Matrix - Vorgabe
   Diagonalen zeichnen
"""
from machine import Pin
from neopixel import NeoPixel
from time import sleep
from random import randrange

NUM_LEDS = 64*6
pixels = NeoPixel(Pin(2), NUM_LEDS)
for i in range(NUM_LEDS):
   pixels[i]=(255, 255, 255)
pixels.write()

rot = (255,0,0); rott = (0,0,255)

for i in range(NUM_LEDS):
   z = i//8%8
   s =  i%8
   if z==s:
      pixels[i] = rot
      #print(i)   
      #pixels.write()
pixels.write()


def matrix_vorn(z,s,f):
   if z%2==1:
      pos = (z-1)*8 + s-1
   else:
      pos = (z-1)*8 + 8-s
   pixels[pos] = f
   pixels.write()

matrix_vorn(2,5,rott)

for i in range(1,9):
   matrix_vorn(i,i,rot)
#   matrix_links(i,i,rot)
#   matrix_oben(i,i, rot)
#   matrix_rechts(i,i,rot)
#   matrix_hinten(i,i,rot)
#   matrix_unten(i,i,rot)