def gen_sweep_rand(n_frames, n_frames_fade, n_frames_rand, colors):
"""
Fades all pixels from one color to the next one following a linear curve
:param n_frames: Duration between two consecutive colors
:param n_frames_fade: Duration of initial fade
:param n_frames_rand: Random seed for this pixel, extra duration added to n_frames to get the total duration
:param colors: list of colors to sweep
"""
h0, s0, v0 = colors[0]
num_cols = len(colors)
n_frames = n_frames + n_frames_rand
# This loop fades up and is also the random seed
for f in range(n_frames_fade):
yield hsv_to_rgb(h0, s0, v0 * (float(f) / n_frames_fade))
while True:
# Selection of the next couple of colors (col_1, col_2)
for col_1 in range(num_cols):
col_2 = (col_1 + 1) % num_cols
h1, s1, v1 = colors[col_1]
h2, s2, v2 = colors[col_2]
# Linearly fading col_1 to col_2
for f in range(n_frames):
factor_2 = float(f) / n_frames
factor_1 = 1 - factor_2
yield hsv_to_rgb(h1 * factor_1 + h2 * factor_2,
s1 * factor_1 + s2 * factor_2,
v1 * factor_1 + v2 * factor_2)
def gen_random_flashing(n_frames, n_frames_fade, n_frames_rand, colors):
"""
Fades all pixels to white (saturation = 0) following an exponential curve
:param n_frames: Duration of two consecutive colors
:param n_frames_fade: Duration of initial fade
:param n_frames_rand: Random seed for this pixel, extra duration added to n_frames to get the total duration
:param colors: At least 2 HSV elements to fade
"""
h0, s0, v0 = colors[0]
n_frames = n_frames + n_frames_rand
# This loop fades up
for f in range(n_frames_fade):
yield hsv_to_rgb(h0, s0, v0 * (float(f) / n_frames_fade))
base = 1.1 # Exponential base. Higher the base is, lower the duration of fade will be
def yield_exp(step):
e = 1 - base**(step - n_frames / 2 + 1) # e = 1..0
return hsv_to_rgb(h0, e * s0, v0)
while True:
# Exponential rise
for f in range(int(n_frames / 2)):
yield yield_exp(f)
# Exponential fall
for f in range(int(n_frames / 2), -1, -1):
yield yield_exp(f)
def gen_sweep_async(n_frames, n_frames_fade, n_frames_rand, colors):
"""
Browse the full color wheel (hue component)
:param n_frames: Duration between two consecutive colors
:param n_frames_fade: Unused
:param n_frames_rand: Duration of fade + random seed
:param colors: 1-element list containing the first color of the wheel
"""
h0, s0, v0 = colors[0]
# This loop fades up and is also the random seed
for f in range(n_frames_rand):
yield hsv_to_rgb(h0, s0, v0 * (float(f) / n_frames_rand))
# Infinite loop on color sequence
while True:
for f in range(n_frames):
yield hsv_to_rgb((h0 - float(f) / n_frames) % 1., s0, v0)
def yield_exp(step):
e = 1 - base**(step - n_frames / 2 + 1) # e = 1..0
return hsv_to_rgb(h0, e * s0, v0)