App Entwicklungsanleitung und Beispielapp hinzugefügt

apps/example.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+
+import os
+import sys
+import random 
+import time
+
+# Groesse des Bildschirms bestimmen
+Nx = int(sys.argv[1])
+Ny = int(sys.argv[2])
+
+# Bestimme den Parameter
+time_ms = 100
+try:
+    time_ms = int(sys.argv[3])
+except:
+    pass
+
+# Puffer fuer Pixel erstellen und mit 0 initialisieren
+buffer = bytearray(b"\x00" * (3 * Nx * Ny))
+
+curPixel = 0
+
+while True:
+    # Zufaellige Pixel waeheln
+    # rot
+    x_r = random.randint(0, Nx-1)
+    y_r = random.randint(0, Ny-1)
+    i_r = 3*(x_r+Nx*y_r)
+    # gruen 
+    x_g = random.randint(0, Nx-1)
+    y_g = random.randint(0, Ny-1)
+    i_g = 3*(x_g+Nx*y_g)
+    # blau
+    x_b = random.randint(0, Nx-1)
+    y_b = random.randint(0, Ny-1)
+    i_b = 3*(x_b+Nx*y_b)
+
+    # Pixel in Puffer schreiben
+    # rot
+    buffer[i_r+0] = 0xff # Rotanteil
+    buffer[i_r+1] = 0x00 # Gruenanteil
+    buffer[i_r+2] = 0x00 # Blauanteil
+    # gruen
+    buffer[i_g+0] = 0x00 # Rotanteil
+    buffer[i_g+1] = 0xff # Gruenanteil
+    buffer[i_g+2] = 0x00 # Blauanteil
+    # blau
+    buffer[i_b+0] = 0x00 # Rotanteil
+    buffer[i_b+1] = 0x00 # Gruenanteil
+    buffer[i_b+2] = 0xff # Blauanteil
+
+    
+
+    # Zeige den Puffer an
+    os.write(1, buffer)
+    # warte time_ms ms
+    time.sleep(time_ms*0.001)