adafruit-mirror/Adafruit_CircuitPython_LED_Animation
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remove use of sin from pulse

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This commit is contained in:
Roy Hooper 2019-12-10 18:04:15 -05:00
parent 0d929282cd
commit eb24e61109
1 changed files with 7 additions and 6 deletions
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13
adafruit_led_animation/animation.py
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@ -44,7 +44,7 @@ Implementation Notes
"""
import random
from math import ceil, sin, radians
from math import ceil
from . import NANOS_PER_SECOND
from .color import BLACK, RAINBOW
@ -349,7 +349,8 @@ class Pulse(Animation):
self.min_intensity = min_intensity
self._period = period
self._intensity_delta = max_intensity - min_intensity
self._radians_per_second = radians(180 / period)
self._half_period = period / 2
self._position_factor = 1 / self._half_period
self._bpp = len(pixel_object[0])
self._last_update = monotonic_ns()
self._cycle_position = 0
@ -359,10 +360,10 @@ class Pulse(Animation):
now = monotonic_ns()
time_since_last_draw = (now - self._last_update) / NANOS_PER_SECOND
self._last_update = now
self._cycle_position = (self._cycle_position + time_since_last_draw) % self._period
intensity = self.min_intensity + (
sin(self._radians_per_second * self._cycle_position) * self._intensity_delta)
pos = self._cycle_position = (self._cycle_position + time_since_last_draw) % self._period
if pos > self._half_period:
pos = self._period - pos
intensity = self.min_intensity + (pos * self._intensity_delta * self._position_factor)
color = [int(self.color[n] * intensity) for n in range(self._bpp)]
self.fill(color)
self.show()