132 lines
4.8 KiB
Python
132 lines
4.8 KiB
Python
# The MIT License (MIT)
|
|
#
|
|
# Copyright (c) 2019-2020 Roy Hooper
|
|
# Copyright (c) 2020 Kattni Rembor for Adafruit Industries
|
|
#
|
|
# Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
# of this software and associated documentation files (the "Software"), to deal
|
|
# in the Software without restriction, including without limitation the rights
|
|
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
# copies of the Software, and to permit persons to whom the Software is
|
|
# furnished to do so, subject to the following conditions:
|
|
#
|
|
# The above copyright notice and this permission notice shall be included in
|
|
# all copies or substantial portions of the Software.
|
|
#
|
|
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
# THE SOFTWARE.
|
|
"""
|
|
`adafruit_led_animation.animation.comet`
|
|
================================================================================
|
|
|
|
TODO
|
|
|
|
* Author(s): Roy Hooper, Kattni Rembor
|
|
|
|
"""
|
|
|
|
from adafruit_led_animation.animation import Animation
|
|
from adafruit_led_animation.color import BLACK
|
|
|
|
|
|
class Comet(Animation):
|
|
"""
|
|
A comet animation.
|
|
|
|
:param pixel_object: The initialised LED object.
|
|
:param float speed: Animation speed in seconds, e.g. ``0.1``.
|
|
:param color: Animation color in ``(r, g, b)`` tuple, or ``0x000000`` hex format.
|
|
:param int tail_length: The length of the comet. Defaults to 10. Cannot exceed the number of
|
|
pixels present in the pixel object, e.g. if the strip is 30 pixels
|
|
long, the ``tail_length`` cannot exceed 30 pixels.
|
|
:param bool reverse: Animates the comet in the reverse order. Defaults to ``False``.
|
|
:param bool bounce: Comet will bounce back and forth. Defaults to ``True``.
|
|
"""
|
|
|
|
# pylint: disable=too-many-arguments
|
|
def __init__(
|
|
self,
|
|
pixel_object,
|
|
speed,
|
|
color,
|
|
tail_length=10,
|
|
reverse=False,
|
|
bounce=False,
|
|
name=None,
|
|
):
|
|
self._tail_length = tail_length + 1
|
|
self._color_step = 0.9 / tail_length
|
|
self._color_offset = 0.1
|
|
self._comet_colors = None
|
|
self._reverse_comet_colors = None
|
|
self._initial_reverse = reverse
|
|
self.reverse = reverse
|
|
self.bounce = bounce
|
|
self._computed_color = color
|
|
self._generator = self._comet_generator()
|
|
super().__init__(pixel_object, speed, color, name=name)
|
|
|
|
cycle_complete_supported = True
|
|
|
|
def _recompute_color(self, color):
|
|
pass
|
|
|
|
def __recompute_color(self, color):
|
|
self._comet_colors = [BLACK] + [
|
|
[
|
|
int(color[rgb] * ((n * self._color_step) + self._color_offset))
|
|
for rgb in range(len(color))
|
|
]
|
|
for n in range(self._tail_length - 1)
|
|
]
|
|
self._reverse_comet_colors = list(reversed(self._comet_colors))
|
|
self._computed_color = color
|
|
|
|
def _get_range(self, num_pixels):
|
|
if self.reverse:
|
|
return range(num_pixels, -self._tail_length - 1, -1)
|
|
return range(-self._tail_length, num_pixels + 1)
|
|
|
|
def _comet_generator(self):
|
|
num_pixels = len(self.pixel_object)
|
|
cycle_passes = 0
|
|
while True:
|
|
if self._color != self._computed_color or not self._comet_colors:
|
|
self.__recompute_color(self._color)
|
|
colors = self._reverse_comet_colors if self.reverse else self._comet_colors
|
|
for start in self._get_range(num_pixels):
|
|
|
|
if start + self._tail_length < num_pixels:
|
|
end = self._tail_length
|
|
else:
|
|
end = num_pixels - start
|
|
if start <= 0:
|
|
num_visible = self._tail_length + start
|
|
self.pixel_object[0:num_visible] = colors[
|
|
self._tail_length - num_visible :
|
|
]
|
|
else:
|
|
self.pixel_object[start : start + end] = colors[0:end]
|
|
self.show()
|
|
yield
|
|
cycle_passes += 1
|
|
if self.bounce:
|
|
self.reverse = not self.reverse
|
|
if not self.bounce or cycle_passes == 2:
|
|
self.cycle_complete()
|
|
cycle_passes = 0
|
|
|
|
def draw(self):
|
|
next(self._generator)
|
|
|
|
def reset(self):
|
|
"""
|
|
Resets to the first color.
|
|
"""
|
|
self._generator = self._comet_generator()
|
|
self.reverse = self._initial_reverse
|