pixelserver2/apps/backlight.py

#!/usr/bin/env python3

import os
import sys
import random
import time
import math
import numpy as np

# Groesse des Bildschirms bestimmen
Nx = int(sys.argv[1])
Ny = int(sys.argv[2])

# Bestimme den Parameter
time_ms = 10
try:
    time_ms = int(sys.argv[3])
except:
    pass

# Puffer fuer Pixel erstellen und mit 0 initialisieren

curPixel = 0

phase = np.random.uniform(0, 2 * np.pi, (Ny, Nx))
t = 0
f_min = 0.08
f_max = 0.10
f = np.random.uniform(f_min, f_max, (Ny, Nx))
while True:
    t += time_ms / 1000.0
    s = 0.80 + 0.2 * np.sin(phase + 2 * np.pi * t * f)
    img = np.zeros([Ny, Nx, 4])
    img[:, :, 3] = 255 * s
    # Zeige den Puffer an
    out = img.reshape((Nx * Ny * 4,)).astype(np.uint8)
    os.write(1, out.tobytes())
    # warte time_ms ms
    time.sleep(time_ms * 0.001)