# ## Twinkle ##
# This Bibliopixel animation randomly picks leds and slowly brightens them to a max brightness
# then dims them to off.
# Based on BPA.strip.WhiteTwinkle and modified by Adam Haile
#
# ## Usage ##
#
# colors - List of colors to use
# speed - How fast the leds bighten then dim (best in range 2-40)
# density - How often to light a new pixel
# max_bright - The maximum brightness, some leds twinkle better if they ramp to less than full
# brightness (19 - 255). Lower brightness also speeds up the twinkle rate.
from bibliopixel.colors import COLORS
from bibliopixel.colors.arithmetic import color_scale
import random
# Base class to be used by any display type
class TwinkleBase:
def __init__(self, layout, colors=[COLORS.Red, COLORS.Green, COLORS.Blue],
density=20, speed=2, max_bright=255):
self.layout = layout
self.colors = colors
self.density = density
self.speed = speed
self.max_bright = max_bright
# Make sure speed, density & max_bright are in sane ranges
self.speed = min(self.speed, 100)
self.speed = max(self.speed, 2)
self.density = min(self.density, 100)
self.density = max(self.density, 2)
self.max_bright = min(self.max_bright, 255)
self.max_bright = max(self.max_bright, 5)
def pre_run(self):
self._step = 0
# direction, color, level
self.pixels = [(0, COLORS.Off, 0)] * self.layout.numLEDs
def pick_led(self, speed):
idx = random.randrange(0, self.layout.numLEDs)
p_dir, p_color, p_level = self.pixels[idx]
if random.randrange(0, 100) < self.density:
if p_dir == 0: # 0 is off
p_level += speed
p_dir = 1 # 1 is growing
p_color = random.choice(self.colors)
self.layout._set_base(idx, color_scale(p_color, p_level))
self.pixels[idx] = p_dir, p_color, p_level
def step(self, amt=1):
self.layout.all_off()
self.pick_led(self.speed)
for i, val in enumerate(self.pixels):
p_dir, p_color, p_level = val
if p_dir == 1:
p_level += self.speed
if p_level > 255:
p_level = 255
p_dir = 2 # start dimming
self.layout._set_base(i, color_scale(p_color, p_level))
elif p_dir == 2:
p_level -= self.speed
if p_level < 0:
p_level = 0
p_dir = 0 # turn off
self.layout._set_base(i, color_scale(p_color, p_level))
self.pixels[i] = (p_dir, p_color, p_level)
self._step += amt
