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animations.py
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animations.py
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import time
STRAND_LENGTH = 50
ALL_BRIGHTNESS = 63
ALL_LIGHTS = list(range(STRAND_LENGTH))
FRAMERATE = 24
BRIGHTNESS_MAX = 255
def squash(segments):
result = {}
for segment in segments:
result.update(segment)
return result
def merge_animations(*animations):
assert all((len(a.steps) == len(animations[0].steps) for a in animations))
all_steps = []
for anim in animations:
frames = anim.steps
assert all(isinstance(f, type(frames[0])) for f in frames)
if isinstance(frames[0], Animation):
frames = merge_animations(*frames).steps
assert all(f.duration == frames[0].duration for f in frames)
for i, frame in enumerate(frames):
if len(all_steps) <= i:
all_steps.append(Frame(duration=frame.duration))
for seg in frame.segments:
all_steps[i].insert_segment(seg)
return Animation(all_steps)
def deserialize(obj):
if "__type__" not in obj:
print(obj)
raise ValueError("Invalid data -- no '__type__'")
kind = obj["__type__"]
if kind == "Segment":
return Segment.deserialize(obj)
elif kind == "Frame":
return Frame.deserialize(obj)
elif kind == "Animation":
return Animation.deserialize(obj)
def normalize_color(color):
if isinstance(color, int):
return [((color >> 16) & 0xFF) // 16,
((color >> 8) & 0xFF) // 16,
(color & 0xFF) // 16]
else:
return color
# Takes a rendered frame to output, and a function of the form:
# put(id, brightness, r, g, b). Returns the time when the next frame
# should be rendered
def put_frame(rendered_frame, put):
for light, state in rendered_frame["states"].items():
put(light, state.get("brightness", 255), *(state.get("color", [0, 0, 0])))
return time.time() + rendered_frame["duration"]
class FrameHolder:
def __init__(self, frame=None):
self.frame = frame
def put_animation(rendered_animation, put, last_frame=FrameHolder(), cutoff=False, keyframes=0):
i = 0
end_time = rendered_animation["duration"] + time.time()
while time.time() < end_time:
for step in rendered_animation["steps"]:
if step["type"] == "Animation":
put_animation(step, put, last_frame, cutoff, keyframes)
elif step["type"] == "Frame":
if last_frame.frame and (not keyframes or i != keyframes):
diff_frame(last_frame.frame, step, put)
i += 1
else:
put_frame(step, put)
i = 0
last_frame.frame = step
time.sleep(step["duration"])
if time.time() >= end_time and cutoff:
break
if time.time() < end_time:
time.sleep(end_time - time.time())
class Segment:
@classmethod
def deserialize(cls, data):
return Segment(data["lights"], data["color"], data["brightness"])
def __init__(self, lights=ALL_LIGHTS, color=None, brightness=None):
if isinstance(lights, int):
lights = [lights]
self.lights = list(lights)
self.__state = {}
if color is not None:
self.__state["color"] = normalize_color(color)
if brightness is not None:
self.__state["brightness"] = brightness
@property
def brightness(self):
return self.__state["brightness"]
@brightness.setter
def brightness(self, brightness):
self.__state["brightness"] = brightness
@property
def color(self):
return self.__state["color"]
@color.setter
def color(self, color):
self.__state["color"] = color
def render(self):
return {l: self.__state for l in self.lights}
def serialize(self):
return {"__type__": "Segment",
"lights": self.lights,
"color": self.__state.get("color", None),
"brightness": self.__state.get("brightness", None)}
BACKGROUND_OFF = Segment(color=0xFFFFFF, brightness=0)
BACKGROUND_BLACK = Segment(color=0x000000, brightness=255)
BACKGROUND_WHITE = Segment(color=0xFFFFFF, brightness=255)
BACKGROUND_RED = Segment(color=0xFF0000, brightness=255)
BACKGROUND_GREEN = Segment(color=0x00FF00, brightness=255)
BACKGROUND_BLUE = Segment(color=0x0000FF, brightness=255)
# Renders a frame only using the differences from previous frame
def diff_frame(a, b, put, background=BACKGROUND_BLACK):
background = background.render()
for light in a["states"].keys() - b["states"].keys():
if light < STRAND_LENGTH:
put(light, background[light]["brightness"],
*background[light]["color"])
for light, state in b["states"].items():
if light not in a["states"] or a["states"][light] != state:
put(light, state.get("brightness", 255), *state.get("color", [0,0,0]))
class Frame:
@classmethod
def deserialize(cls, data):
return Frame(segments=[deserialize(seg) for seg in data["segments"]],
duration=data["duration"])
def __init__(self, segments=[], duration=1):
if isinstance(segments, Segment):
segments = [segments]
self.segments = segments
self.duration = duration
def insert_segment(self, segment, at=None):
if at is None:
at = len(self.segments)
self.segments = self.segments[:at] + [segment] + self.segments[at:]
def render(self):
return {"type": "Frame",
"states": squash((seg.render() for seg in self.segments)),
"duration": self.duration}
def serialize(self):
return {"__type__": "Frame",
"segments": [seg.serialize() for seg in self.segments],
"duration": self.duration}
class Animation:
@classmethod
def deserialize(cls, data):
return Animation(steps=[deserialize(s) for s in data["steps"]],
duration=data["duration"])
def __init__(self, steps=[], duration=None):
self.steps = steps
self.duration = duration or sum((s.duration for s in steps))
def render(self):
return {"type": "Animation",
"steps": [s.render() for s in self.steps],
"duration": self.duration}
def __add__(self, other):
return merge_animations(self, other)
def serialize(self):
return {"__type__": "Animation",
"steps": [s.serialize() for s in self.steps],
"duration": self.duration}
class FadeIn(Animation):
def __init__(self, duration=1, start=0, stop=BRIGHTNESS_MAX):
steps = []
for i in range(start, stop+1):
steps.append(Frame(Segment(lights=ALL_BRIGHTNESS, brightness=i),
duration=(duration/abs(stop-start))))
self.steps = steps
self.duration = duration
class FadeOut(Animation):
def __init__(self, duration=1, start=BRIGHTNESS_MAX, stop=0):
steps = []
for i in range(start, stop-1, -1):
steps.append(Frame(Segment(lights=ALL_BRIGHTNESS, brightness=i),
duration=(duration/abs(start-stop))))
self.steps = steps
self.duration = duration