# SPDX-FileCopyrightText: 2017 PaintYourDragon for Adafruit Industries
#
# SPDX-License-Identifier: MIT
"""
`adafruit_fancyled.fastled_helpers`
====================================================
CircuitPython "helper" library based on the Arduino FastLED library.
Uses similar function names to assist with porting of existing Arduino FastLED
projects to CircuitPython.
* Author(s): PaintYourDragon
"""
# imports
__version__ = "0.0.0-auto.0"
__repo__ = "https://github.com/Adafruit/Adafruit_CircuitPython_FancyLED.git"
from math import floor
from adafruit_fancyled import adafruit_fancyled as fancy
# These are helper functions that provide more FastLED-like calls for
# fancyled functions.
# Function names are kept the same as FastLED, which normally upsets pylint.
# Disable name-checking so this passes muster.
# pylint: disable=invalid-name
GFACTOR = 2.5 # Default gamma-correction factor for function below
[docs]def applyGamma_video(n, g_r=GFACTOR, g_g=None, g_b=None, inplace=False):
"""Approximates various invocations of FastLED's many-ways-overloaded
applyGamma_video() function.
ACCEPTS: One of three ways:
1. A single brightness level (0-255) and optional gamma-correction
factor (float usu. > 1.0, default if unspecified is 2.5).
2. A single CRGB, CHSV or packed integer type and optional gamma
factor or separate R, G, B gamma values.
3. A list of CRGB, CHSV or packed integer types (and optional gamma(s)).
In the tuple/list cases, the 'inplace' flag determines whether
a new tuple/list is calculated and returned, or the existing
value is modified in-place. By default this is 'False'.
Can also use the napplyGamma_video() function to more directly
approximate FastLED syntax/behavior.
RETURNS: Corresponding to above cases:
1. Single gamma-corrected brightness level (0-255).
2. A gamma-corrected CRGB value (even if input is CHSV or packed).
3. A list of gamma-corrected CRGB values.
In the tuple/list cases, there is NO return value if 'inplace'
is true -- the original values are modified.
"""
# If single gamma value is passed, keep that, otherwise convert
# gamma values to tuple for gamma_adjust function.
if g_g is not None and g_b is not None:
g_r = (g_r, g_g, g_b)
return fancy.gamma_adjust(n, g_r, inplace=inplace)
[docs]def napplyGamma_video(n, g_r=GFACTOR, g_g=None, g_b=None):
"""In-place version of applyGamma_video() (to mimic FastLED function
name). This is for RGB tuples and tuple lists (not the prior function's
integer case)
"""
return applyGamma_video(n, g_r, g_g, g_b, inplace=True)
[docs]def loadDynamicGradientPalette(src, size):
"""Kindasorta like FastLED's loadDynamicGradientPalette() function,
with some gotchas.
ACCEPTS: Gradient palette data as a 'bytes' type (makes it easier to copy
over gradient palettes from existing FastLED Arduino sketches)...
each palette entry is four bytes: a relative position (0-255)
within the overall resulting palette (whatever its size), and
3 values for R, G and B...and a length for a new palette list
to be allocated.
RETURNS: list of CRGB colors.
"""
# Convert gradient from bytelist (groups of 4) to list of tuples,
# each consisting of a position (0.0 to 1.0) and CRGB color.
# (This is what FancyLED's expand_gradient needs for input.)
grad = []
for i in range(0, len(src), 4):
grad.append((src[i] / 255.0, fancy.CRGB(src[i + 1], src[i + 2], src[i + 3])))
# Create palette (CRGB list) matching 'size' length
return fancy.expand_gradient(grad, size)
[docs]def ColorFromPalette(pal, pos, brightness=255, blend=False):
"""Approximates the FastLED ColorFromPalette() function
ACCEPTS: color palette (list of CRGB, CSHV and/or packed ints),
palette index (x16) + blend factor of next index (0-15) --
e.g. pass 32 to retrieve palette index 2, or 40 for an
interpolated value between palette index 2 and 3, optional
brightness (0-255), optional blend flag (True/False)
RETURNS: CRGB color, no gamma correction
"""
# Alter 'pos' from FastLED-like behavior to fancyled range
if blend:
# Continuous interpolation 0.0 to 1.0
pos = (pos / 16.0) / len(pal)
else:
# No blending -- quantize to nearest palette bin
pos = floor(pos / 16.0) / len(pal)
color = fancy.palette_lookup(pal, pos)
if brightness < 1.0:
brightness /= 255.0
if isinstance(color, fancy.CHSV):
color = fancy.CRGB(color)
elif isinstance(color, int):
color = fancy.unpack(color)
color.red *= brightness
color.green *= brightness
color.blue *= brightness
return color
[docs]def hsv2rgb_spectrum(hue, sat, val):
"""This is named the same thing as FastLED's simpler HSV to RGB function
(spectrum, vs rainbow) but implementation is a bit different for the
sake of getting something running (adapted from some NeoPixel code).
ACCEPTS: hue, saturation, value in range 0 to 255
RETURNS: CRGB color.
"""
return fancy.CRGB(fancy.CHSV(hue / 255, sat / 255, val / 255))
# pylint: enable=invalid-name