"""
This creates a palette of colors, draws a pattern and
rotates through the palette creating a moving rainbow.
"""
from math import sqrt, cos, sin, radians
from adafruit_featherwing import neopixel_featherwing
neopixel = neopixel_featherwing.NeoPixelFeatherWing()
# Remap the calculated rotation to 0 - 255
def remap(vector):
return int(((255 * vector + 85) * 0.75) + 0.5)
# Calculate the Hue rotation starting with Red as 0 degrees
def rotate(degrees):
cosA = cos(radians(degrees))
sinA = sin(radians(degrees))
red = cosA + (1.0 - cosA) / 3.0
green = 1./3. * (1.0 - cosA) + sqrt(1./3.) * sinA
blue = 1./3. * (1.0 - cosA) - sqrt(1./3.) * sinA
return (remap(red), remap(green), remap(blue))
palette = []
pixels = []
# Generate a rainbow palette
for degree in range(0, 360):
color = rotate(degree)
palette.append(color[0] << 16 | color[1] << 8 | color[2])
"""
This creates a palette of colors, draws a pattern and
rotates through the palette creating a moving rainbow.
"""
from math import sqrt, cos, sin, radians
from adafruit_featherwing import neopixel_featherwing
neopixel = neopixel_featherwing.NeoPixelFeatherWing(brightness=0.1)
# Remap the calculated rotation to 0 - 255
def remap(vector):
return int(((255 * vector + 85) * 0.75) + 0.5)
# Calculate the Hue rotation starting with Red as 0 degrees
def rotate(degrees):
cosA = cos(radians(degrees))
sinA = sin(radians(degrees))
red = cosA + (1.0 - cosA) / 3.0
green = 1. / 3. * (1.0 - cosA) + sqrt(1. / 3.) * sinA
blue = 1. / 3. * (1.0 - cosA) - sqrt(1. / 3.) * sinA
return (remap(red), remap(green), remap(blue))
palette = []
pixels = []
# Generate a rainbow palette
for degree in range(0, 360):