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fx.py
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fx.py
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import colour
from PIL import Image, ImageChops, ImageColor
from abc import ABCMeta, abstractmethod
from bisect import bisect_right
from math import exp, sqrt
from numbers import Number
from random import choice, random, randrange
class FXBase(object, metaclass=ABCMeta):
def __init__(self, size, args):
self.size = size
self.time = None
self.start_time = None
self.previous_time = None
self.image = None
self.background = None
self._params = self.params(args) or {}
def __getattr__(self, nm):
if nm == '_params':
# Avoid infinite recursion if a parameter is accessed during initialisation.
raise Exception("Can't use params during initialisation")
return self._params[nm]
def new_image(self, *colours, size=None, ring=False):
if size is None:
size = self.size
if len(colours) == 0:
colours = ['transparent']
if ring and len(colours) > 1:
colours += (colours[0],)
scale = colour.scale(*colours)
if scale.is_flat():
return Image.new('RGBA', size, scale(0))
img = Image.new('RGBA', size)
pix = img.load()
for x in range(size[0]):
i = 0.5 if size[0] < 2 else x / (size[0] - 1.0)
c = scale(i)
for y in range(size[1]):
pix[x, y] = c
return img
def params(self, args):
pass
@abstractmethod
def default_layer(self):
return 0
@abstractmethod
def render(self):
pass
def next_image(self, time, background):
if self.start_time is None:
self.start_time = time
self.previous_time = self.time
self.time = time
self.background = background
self.image = self.render()
return self.image
class BgFX(FXBase):
def params(self, colours):
self.img = self.new_image(*colours)
def default_layer(self):
return 10
def render(self):
return self.img
class FadeFX(FXBase):
def params(self, vals):
imgs = []
cols = []
tlast = 0
for v in vals:
if isinstance(v, Number):
img = self.new_image(*cols)
imgs.append([tlast, img])
tlast += v
cols = []
else:
cols.append(v)
imgs.append([tlast, self.new_image(*cols)])
self.imgs = imgs
def default_layer(self):
return 20
def render(self):
imgs = self.imgs
if self.time <= self.start_time:
return imgs[0][1]
elif self.time >= self.start_time + imgs[-1][0]:
return imgs[-1][1]
i = bisect_right(imgs, [self.time - self.start_time, None])
a = (self.time - self.start_time - imgs[i-1][0]) / (imgs[i][0] - imgs[i-1][0])
return Image.blend(imgs[i-1][1], imgs[i][1], a)
class SpinFX(FXBase):
def params(self, args):
imgs = []
period = 1
if len(args) > 0 and isinstance(args[0], Number):
period = args[0]
args = args[1:]
cols = []
tlast = 0
for v in args:
if isinstance(v, Number):
img = self.new_image(*cols, ring=True)
imgs.append([tlast, img])
tlast += v
cols = []
else:
cols.append(v)
imgs.append([tlast, self.new_image(*cols, ring=True)])
self.imgs = imgs
return dict(period=period)
def default_layer(self):
return 30
def render(self):
imgs = self.imgs
if self.time <= self.start_time:
return imgs[0][1]
elif self.time >= self.start_time + imgs[-1][0]:
return None
i = bisect_right(imgs, [self.time - self.start_time, None])
a = (self.time - self.start_time - imgs[i-1][0]) / (imgs[i][0] - imgs[i-1][0])
img = Image.blend(imgs[i-1][1], imgs[i][1], a)
shift = int(img.size[0] * (self.time - self.start_time) / self.period)
return ImageChops.offset(img, shift, 0)
class RotateFX(FXBase):
def params(self, args):
return dict(period=1 if len(args) < 1 else args[0],
reps=-1 if len(args) < 2 else args[1])
def default_layer(self):
return 40
def render(self):
if self.reps >= 0 and self.time > self.start_time + self.period * self.reps:
return None
shift = int(self.size[0] * (self.time - self.start_time) / self.period)
return ImageChops.offset(self.background, shift, 0)
class ChaseFX(FXBase):
def params(self, args):
period = 1
if len(args) > 0 and isinstance(args[0], Number):
period = args[0]
args = args[1:]
stop = 0.05
if len(args) > 0 and isinstance(args[0], Number):
stop = args[0]
args = args[1:]
reps = -1
if len(args) > 0 and isinstance(args[0], Number):
reps = args[0]
args = args[1:]
width = max(self.size[0] // 10, 4)
if len(args) > 0 and isinstance(args[0], Number):
width = args[0]
args = args[1:]
fade = int(sqrt(max(width, 0) / 1.5))
if len(args) > 0 and isinstance(args[0], Number):
fade = args[0]
args = args[1:]
sprite_cols = args if len(args) > 0 else ['white']
sprite_size = (width, self.size[1])
self.sprite = self.new_image(*sprite_cols, size=sprite_size)
pix = self.sprite.load()
for x in range(min(fade, (width + 1) // 2)):
v = (x + 1) / (fade + 1)
for y in range(self.size[1]):
p = pix[x, y]
pix[x, y] = p[0:3] + (int(p[3] * v),)
if x < width // 2:
# Dont double-fade central pixel on odd widths
p = pix[width - 1 - x, y]
pix[width - 1 - x, y] = p[0:3] + (int(p[3] * v),)
return dict(period=period, stop=stop, reps=reps, width=width, fade=fade)
def default_layer(self):
return 50
def render(self):
if self.reps >= 0 and (self.time > self.start_time + abs(self.period) * self.reps):
return None
img = self.new_image()
t = self.time - self.start_time
if self.period < 0:
t -= self.period
t %= abs(2 * self.period)
d = 1
if t > abs(self.period):
t -= abs(self.period)
d = -1
a = min(1.0, t / abs(self.period * (1.0 - self.stop)))
if d < 0:
a = 1.0 - a
x = round(a * (self.size[0] - self.width))
img.paste(self.sprite, (x, 0))
return img
class SlideFX(FXBase):
def params(self, args):
period = 1
if len(args) > 0 and isinstance(args[0], Number):
period = args[0]
args = args[1:]
width = max(self.size[0] // 10, 4)
if len(args) > 0 and isinstance(args[0], Number):
width = args[0]
args = args[1:]
fade = int(sqrt(max(width, 0) / 1.5))
if len(args) > 0 and isinstance(args[0], Number):
fade = args[0]
args = args[1:]
sprite_cols = args if len(args) > 0 else ['white']
sprite_size = (width, self.size[1])
self.sprite = self.new_image(*sprite_cols, size=sprite_size)
pix = self.sprite.load()
for x in range(min(fade, (width + 1) // 2)):
v = (x + 1) / (fade + 1)
for y in range(self.size[1]):
p = pix[x, y]
pix[x, y] = p[0:3] + (int(p[3] * v),)
if x < width // 2:
# Dont double-fade central pixel on odd widths
p = pix[width - 1 - x, y]
pix[width - 1 - x, y] = p[0:3] + (int(p[3] * v),)
return dict(period=period, width=width, fade=fade)
def default_layer(self):
return 60
def render(self):
if self.time > self.start_time + abs(self.period):
return None
img = self.new_image()
a = (self.time - self.start_time) / abs(self.period)
if self.period < 0:
a = 1 - a
x = round(a * (self.size[0] + self.width) - self.width)
img.paste(self.sprite, (x, 0))
return img
class FlashFX(FXBase):
def params(self, args):
period = 0
if len(args) > 0 and isinstance(args[0], Number):
period = args[0]
args = args[1:]
self.img = self.new_image(*args)
self.trans = self.new_image()
return dict(period=period)
def default_layer(self):
return 70
def render(self):
if self.time > self.start_time + self.period:
return None
if self.period <= 0:
return self.img
a = (self.time - self.start_time) / self.period
return Image.blend(self.img, self.trans, a)
class SparkleFX(FXBase):
def params(self, args):
period = 0
if len(args) > 0 and isinstance(args[0], Number):
period = args[0]
args = args[1:]
fade = 0
if len(args) > 0 and isinstance(args[0], Number):
fade = args[0]
args = args[1:]
nspark = 10
if len(args) > 0 and isinstance(args[0], Number):
nspark = args[0]
args = args[1:]
colours = [ImageColor.getrgb(c) for c in (args if len(args) > 0 else ['white'])]
self.img = self.new_image()
return dict(period=period, fade=fade, nspark=nspark, colours=colours)
def default_layer(self):
return 80
def render(self):
if self.time > self.start_time + self.period + self.fade:
return None
pix = self.img.load()
if self.previous_time is not None:
nfade = 255 if self.fade <= 0 else round((self.time - self.previous_time)
* 255 / self.fade)
for y in range(self.size[1]):
for x in range(self.size[0]):
p = pix[x, y]
pix[x, y] = p[:3] + (max(0, p[3] - nfade),)
if self.time < self.start_time + self.period:
for i in range(self.nspark):
pix[randrange(self.size[0]), randrange(self.size[1])] = choice(self.colours)
return self.img
class FlameFX(FXBase):
# Adapted from https://www.tweaking4all.com/hardware/arduino/adruino-led-strip-effects/#fire
EXTRA = 10 # Extra pixels before start of strip where sparks are generated
def params(self, args):
sparking = args[0] if len(args) > 0 else 1 # Average number of sparks per frame
cooling = args[1] if len(args) > 1 else 1 # Cooling rate
kernel = self.parse_kernel(args[2]) if len(args) > 2 else [0, 1, 2] # Drift + diffusion
self.flame = [0.0] * (self.size[0] + FlameFX.EXTRA)
self.palette = colour.scale('flame')
return dict(sparking=sparking, cooling=cooling, kernel=kernel)
def default_layer(self):
return 90
def parse_kernel(self, s):
return [int(c) for c in s]
def nsparks(self):
# Poisson distributed random number with mean self.sparking
l = exp(-self.sparking)
k = 0
p = 1
while p > l:
k += 1
p *= random()
return k - 1
def render(self):
f = self.flame
# Cool down every cell a little
for i in range(len(f)):
f[i] -= random() * 3 * self.cooling / len(f)
if f[i] < 0.0:
# Clamp pixel heat to minimum of 0
f[i] = 0.0
# Heat from each cell drifts 'up' and diffuses a little
for i in reversed(range(1, len(f))):
n = 0
s = 0
for k, v in enumerate(self.kernel):
if i - k >= 0:
n += v
s += v * f[i - k]
f[i] = s / n if n > 0 else 0
# Randomly ignite new 'sparks' off the end of the strip
for i in range(self.nsparks()):
# Pick a random pixel in the off-strip area
pos = int(random() * FlameFX.EXTRA)
# Spark heat in range 0.5 - 1
f[pos] += random() * 0.5 + 0.5
if f[pos] > 1.0:
# Clamp pixel heat to maximum of 1
f[pos] = 1.0
# Convert heat to LED colors
img = self.new_image()
pix = img.load()
for i in range(self.size[0]):
p = self.palette(f[i + FlameFX.EXTRA])
for j in range(self.size[1]):
pix[i, j] = p
return img