# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

"""Simple FancyLED example for NeoPixel strip"""

import board
import neopixel

import adafruit_fancyled.adafruit_fancyled as fancy

num_leds = 20

# Declare a 6-element RGB rainbow palette
palette = [
    fancy.CRGB(1.0, 0.0, 0.0),  # Red
    fancy.CRGB(0.5, 0.5, 0.0),  # Yellow
    fancy.CRGB(0.0, 1.0, 0.0),  # Green
    fancy.CRGB(0.0, 0.5, 0.5),  # Cyan
    fancy.CRGB(0.0, 0.0, 1.0),  # Blue
    fancy.CRGB(0.5, 0.0, 0.5),
]  # Magenta

# Declare a NeoPixel object on pin D6 with num_leds pixels, no auto-write.
# Set brightness to max because we'll be using FancyLED's brightness control.
pixels = neopixel.NeoPixel(board.D6, num_leds, brightness=1.0, auto_write=False)

offset = 0  # Positional offset into color palette to get it to 'spin'

while True:
    for i in range(num_leds):
        # Load each pixel's color from the palette using an offset, run it
        # through the gamma function, pack RGB value and assign to pixel.
        color = fancy.palette_lookup(palette, offset + i / num_leds)
        color = fancy.gamma_adjust(color, brightness=0.25)
        pixels[i] = color.pack()
    pixels.show()

    offset += 0.02  # Bigger number = faster spin