cleanup and fixing wall time

examples/simpy/main.py

@@ -1,39 +1,41 @@
 #!/usr/bin/env python3
-import threading
-from datetime import datetime
+import datetime
 
 from async_realtime_environment import AsyncRealtimeEnvironment
 
-from nicegui import app, ui
+from nicegui import ui
 
-lblTick = ui.label()
-lblColor = ui.label()
+start_time = datetime.datetime.now()
 
 
 def clock(env):
     while True:
-        lblTick.set_text(datetime.now().strftime("%H:%M:%S"))
-        # lblTick.set_text(f"{env.now}")
+        simulation_time = start_time + datetime.timedelta(seconds=env.now)
+        clock_label.set_text(simulation_time.strftime('%H:%M:%S'))
         yield env.timeout(1)
 
 
 def traffic_light(env):
     while True:
-        lblColor.set_text("GREEN")
+        lblColor.set_text('GREEN')
         yield env.timeout(30)
-        lblColor.set_text("YELLOW")
+        lblColor.set_text('YELLOW')
         yield env.timeout(5)
-        lblColor.set_text("RED")
+        lblColor.set_text('RED')
         yield env.timeout(20)
 
 
 async def run_simpy():
-    env = AsyncRealtimeEnvironment(factor=0.1)
+    env = AsyncRealtimeEnvironment(factor=0.1)  # fast forward simulation with 1/10th of realtime
     env.process(traffic_light(env))
     env.process(clock(env))
-    await env.run(until=300)
-    print("Simulation complete")
+    await env.run(until=300)  # run until 300 seconds of simulation time have passed
+    ui.notify('Simulation completed')
 
+# create the UI
+clock_label = ui.label()
+lblColor = ui.label()
 
+# start the simpy simulation as async task in the background as soon as the UI is ready
 ui.timer(0, run_simpy, once=True)
 ui.run()