fade.py

#!/usr/bin/env python3

import tools
import time
import sys
from colorsys import *


# #010101 -> (1.0/2^16) * 3
def hex2triplet(hexval):
    # print("hexval: %s" % hexval)
    result = []
    for i in range(3):
        ind = 1+i*2
        s = hexval[ind:ind+2]
        val = float(int(s, 16))
        result.append(val / 255)
    return result

def twoDigitHexFromFloat(val):
    hex1 = hex(int(val*255))[2:]
    if len(hex1) == 1: hex1 = '0' + hex1
    return hex1


def triplet2hex(triplet):
    return '#' + ''.join([twoDigitHexFromFloat(v) for v in triplet])

def interp(start, end, t):
    return start + (end - start) * t

def interp_hsv(start, end, t):
    return [interp(start[i], end[i], t) for i in range(3)]


start = rgb_to_hsv(*hex2triplet(tools.ICON_COLOR))
end = rgb_to_hsv(*hex2triplet(tools.BAR_BACKGROUND_COLOR))
# end = rgb_to_hsv(*hex2triplet('#ffffff'))

duration = 0.5
fps = 30
delay = duration / fps

def fade(num_frames = fps * duration):
    iteration = 0
    while True:
        color = interp_hsv(start, end, float(iteration)/num_frames)
        color_rgb = hsv_to_rgb(*color)

        color_hex = triplet2hex(color_rgb)
        # color += 1
        # hex1 = hex(color)[2:]
        # if len(hex1) == 1: hex1 = '0' + hex1
        # color_hex = '#' + hex1 * 3

        # print(tools.pango('    ', background=color_hex, font_size='large'))
        print(tools.pango('30%', background=color_hex))
        sys.stdout.flush()

        iteration += 1
        if iteration == num_frames:
            break

        time.sleep(delay)

tools.autoreload_xresources_with_callback(lambda: fade())
fade()
while True:
    sleep(1000)