149 lines
5.3 KiB
Python
149 lines
5.3 KiB
Python
# The MIT License (MIT)
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#
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# Copyright (c) 2019-2020 Roy Hooper
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# Copyright (c) 2020 Kattni Rembor for Adafruit Industries
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy
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# of this software and associated documentation files (the "Software"), to deal
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# in the Software without restriction, including without limitation the rights
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# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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# copies of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be included in
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# all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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# THE SOFTWARE.
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"""
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`adafruit_led_animation.animation.comet`
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================================================================================
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Comet animation for CircuitPython helper library for LED animations.
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* Author(s): Roy Hooper, Kattni Rembor
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Implementation Notes
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--------------------
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**Hardware:**
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* `Adafruit NeoPixels <https://www.adafruit.com/category/168>`_
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* `Adafruit DotStars <https://www.adafruit.com/category/885>`_
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**Software and Dependencies:**
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* Adafruit CircuitPython firmware for the supported boards:
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https://circuitpython.org/downloads
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"""
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from adafruit_led_animation.animation import Animation
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from adafruit_led_animation.color import BLACK
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class Comet(Animation):
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"""
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A comet animation.
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:param pixel_object: The initialised LED object.
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:param float speed: Animation speed in seconds, e.g. ``0.1``.
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:param color: Animation color in ``(r, g, b)`` tuple, or ``0x000000`` hex format.
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:param int tail_length: The length of the comet. Defaults to 25% of the length of the
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``pixel_object``. Automatically compensates for a minimum of 2 and a
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maximum of the length of the ``pixel_object``.
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:param bool reverse: Animates the comet in the reverse order. Defaults to ``False``.
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:param bool bounce: Comet will bounce back and forth. Defaults to ``True``.
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"""
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# pylint: disable=too-many-arguments
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def __init__(
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self,
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pixel_object,
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speed,
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color,
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tail_length=0,
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reverse=False,
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bounce=False,
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name=None,
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):
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if tail_length == 0:
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tail_length = len(pixel_object) // 4
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else:
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tail_length = max(2, min(tail_length, len(pixel_object)))
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self._tail_length = tail_length
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self._color_step = 0.9 / tail_length
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self._color_offset = 0.1
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self._comet_colors = None
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self._reverse_comet_colors = None
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self._initial_reverse = reverse
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self.reverse = reverse
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self.bounce = bounce
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self._computed_color = color
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self._generator = self._comet_generator()
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super().__init__(pixel_object, speed, color, name=name)
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on_cycle_complete_supported = True
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def _recompute_color(self, color):
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pass
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def _comet_recompute_color(self, color):
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self._comet_colors = [BLACK] + [
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[
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int(color[rgb] * ((n * self._color_step) + self._color_offset))
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for rgb in range(len(color))
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]
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for n in range(self._tail_length - 1)
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]
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self._reverse_comet_colors = list(reversed(self._comet_colors))
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self._computed_color = color
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def _get_range(self, num_pixels):
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if self.reverse:
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return range(num_pixels, -self._tail_length - 1, -1)
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return range(-self._tail_length, num_pixels + 1)
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def _comet_generator(self):
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num_pixels = len(self.pixel_object)
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cycle_passes = 0
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while True:
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if self._color != self._computed_color or not self._comet_colors:
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self._comet_recompute_color(self._color)
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colors = self._reverse_comet_colors if self.reverse else self._comet_colors
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for start in self._get_range(num_pixels):
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if start + self._tail_length < num_pixels:
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end = self._tail_length
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else:
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end = num_pixels - start
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if start <= 0:
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num_visible = self._tail_length + start
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self.pixel_object[0:num_visible] = colors[
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self._tail_length - num_visible :
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]
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else:
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self.pixel_object[start : start + end] = colors[0:end]
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yield
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cycle_passes += 1
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if self.bounce:
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self.reverse = not self.reverse
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if not self.bounce or cycle_passes == 2:
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self.cycle_complete = True
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cycle_passes = 0
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def draw(self):
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next(self._generator)
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def reset(self):
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"""
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Resets to the first color.
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"""
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self._generator = self._comet_generator()
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self.reverse = self._initial_reverse
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