sync with current state

apps/backlight.py

@@ -0,0 +1,38 @@
+#!/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)