Logical NeoPixel chains

Inspired by a discussion with jim_lee on the Adafruit forums.

This lets you layer logical groups of NeoPixels over a longer physical strip/ring. It lets you treat contiguous subsets of pixels as separate strips.

Setup requires 3 steps:

• create the physical NeoPixel object
• create a zone collection on top of that
• add zones to the collection

Each zone added (and returned) can be treated the same as a NeoPixel object.

strip = neopixel.NeoPixel(board.D5, 60, brightness=1, auto_write=False)

collection = ZoneCollection(strip)

zone_1 = collection.add_zone(0, 20)
zone_2 = collection.add_zone_with_size(20, 20)
zone_3 = collection.add_zone(40, 60)

They can be filled with a color:

zone_1.fill((randint(128, 255), randint(0, 255), randint(0, 255)))

Individual elements can be set:

zone_2[i] = (0x00, 0xFF, 0x00)

As can slices:

zone_3[start:end] = [(0x00, 0x00, 0xFF)] * size

If the NeoPixel is created with auto_write=False, it can be updated by calling its show() method, the ZoneCollection's or a Zone's. Calling show() on a Zone will cause show() to be called on its collection, updating all the zones.

See code.py for more usage examples