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Merge pull request #119 from xsorifc28/main
fix(ISSUE-118): move pulse generator from helper to own file to reduce memory footprint when imported
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# SPDX-FileCopyrightText: 2019 Kattni Rembor for Adafruit Industries | ||
# | ||
# SPDX-License-Identifier: MIT | ||
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""" | ||
`adafruit_led_animation.pulse_generator` | ||
================================================================================ | ||
Helper method for pulse generation | ||
* Author(s): Kattni Rembor | ||
Implementation Notes | ||
-------------------- | ||
**Hardware:** | ||
* `Adafruit NeoPixels <https://www.adafruit.com/category/168>`_ | ||
* `Adafruit DotStars <https://www.adafruit.com/category/885>`_ | ||
**Software and Dependencies:** | ||
* Adafruit CircuitPython firmware for the supported boards: | ||
https://circuitpython.org/downloads | ||
""" | ||
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from . import MS_PER_SECOND, monotonic_ms | ||
from .color import calculate_intensity | ||
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def pulse_generator(period: float, animation_object, dotstar_pwm=False): | ||
""" | ||
Generates a sequence of colors for a pulse, based on the time period specified. | ||
:param period: Pulse duration in seconds. | ||
:param animation_object: An animation object to interact with. | ||
:param dotstar_pwm: Whether to use the dostar per pixel PWM value for brightness control. | ||
""" | ||
period = int((period + (animation_object.breath * 2)) * MS_PER_SECOND) | ||
half_breath = int(animation_object.breath * MS_PER_SECOND // 2) | ||
half_period = period // 2 | ||
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last_update = monotonic_ms() | ||
cycle_position = 0 | ||
last_pos = 0 | ||
while True: | ||
now = monotonic_ms() | ||
time_since_last_draw = now - last_update | ||
last_update = now | ||
pos = cycle_position = (cycle_position + time_since_last_draw) % period | ||
if pos < last_pos: | ||
animation_object.cycle_complete = True | ||
last_pos = pos | ||
if pos > half_period: | ||
pos = period - pos | ||
if pos < half_breath: | ||
intensity = animation_object.min_intensity | ||
elif pos > (half_period - half_breath): | ||
intensity = animation_object.max_intensity | ||
else: | ||
intensity = animation_object.min_intensity + ( | ||
((pos - half_breath) / (half_period - (half_breath * 2))) | ||
* (animation_object.max_intensity - animation_object.min_intensity) | ||
) | ||
if dotstar_pwm: | ||
fill_color = ( | ||
animation_object.color[0], | ||
animation_object.color[1], | ||
animation_object.color[2], | ||
intensity, | ||
) | ||
yield fill_color | ||
continue | ||
yield calculate_intensity(animation_object.color, intensity) |