101 lines
3.4 KiB
Python
101 lines
3.4 KiB
Python
# SPDX-FileCopyrightText: 2020 Kattni Rembor for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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"""
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`adafruit_led_animation.animation.rainbowsparkle`
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================================================================================
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Rainbow sparkle for CircuitPython helper library for LED animations.
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* Author(s): 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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import random
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from adafruit_led_animation.animation.rainbow import Rainbow
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class RainbowSparkle(Rainbow):
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"""Rainbow sparkle animation.
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:param pixel_object: The initialised LED object.
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:param float speed: Animation refresh rate in seconds, e.g. ``0.1``.
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:param float period: Period to cycle the rainbow over in seconds. Default 5.
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:param int num_sparkles: The number of sparkles to display. Defaults to 1/20 of the pixel
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object length.
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:param float step: Color wheel step. Default 1.
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:param str name: Name of animation (optional, useful for sequences and debugging).
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:param float background_brightness: The brightness of the background rainbow. Defaults to
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``0.2`` or 20 percent.
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:param bool precompute_rainbow: Whether to precompute the rainbow. Uses more memory.
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(default 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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period=5,
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num_sparkles=None,
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step=1,
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name=None,
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background_brightness=0.2,
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precompute_rainbow=True,
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):
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self._num_sparkles = num_sparkles
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if num_sparkles is None:
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self._num_sparkles = max(1, int(len(pixel_object) / 20))
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self._sparkle_duration = 2
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self._background_brightness = background_brightness
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self._bright_colors = None
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super().__init__(
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pixel_object=pixel_object,
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speed=speed,
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period=period,
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step=step,
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name=name,
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precompute_rainbow=precompute_rainbow,
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)
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def generate_rainbow(self):
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super().generate_rainbow()
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self._bright_colors = self.colors[:]
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for i, color in enumerate(self.colors):
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if isinstance(self.colors[i], int):
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self.colors[i] = (
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int(self._background_brightness * ((color & 0xFF0000) >> 16)),
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int(self._background_brightness * ((color & 0xFF00) >> 8)),
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int(self._background_brightness * (color & 0xFF)),
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)
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else:
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self.colors[i] = (
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int(self._background_brightness * color[0]),
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int(self._background_brightness * color[1]),
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int(self._background_brightness * color[2]),
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)
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def after_draw(self):
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self.show()
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pixels = [
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random.randint(0, len(self.pixel_object) - 1)
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for n in range(self._num_sparkles)
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]
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for pixel in pixels:
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self.pixel_object[pixel] = self._bright_colors[
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(self._wheel_index + pixel) % len(self._bright_colors)
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]
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