Source code for BiblioPixelAnimations.matrix.CPUUsage

from bibliopixel.animation.matrix import Matrix
from bibliopixel.colors import COLORS

import psutil
from collections import deque


class CPUUsage(Matrix):
    COLOR_DEFAULTS = ('onColor', COLORS.Red),

    def __init__(self, layout, **kwds):
        super().__init__(layout, **kwds)
        self._usage = deque(iterable=[0] * self.width, maxlen=self.width)

    def step(self, amt=1):
        self.internal_delay = 0.5
        self.layout.all_off()
        usage = psutil.cpu_percent()
        self._usage.append(int(usage // 100.0 * self.height))

        for x in range(self.width):
            if self._usage[x] > 0:
                self.layout.drawLine(x, self.height,
                                     x, self.height - 1 - self._usage[x],
                                     self.palette())