BeagleboneでのPython Tkinterの使用：Flickerの表示

Question

以下は、BeagleBoneでPythonとTkinterを使用してモニターにデータを表示するためのコードです。素晴らしいですが、データを表示するテキストがちらつきます。なぜどんなアイデア？

#!/usr/bin/python 

import alsaaudio as aa 
import audioop 
import Tkinter as tk 
import tkFont 
import threading 
import Queue 

started = False 

class Display(object): 

    def __init__(self, parent, queue): 
     self.parent = parent 
     self.queue = queue 

     self._geom = '200x200+0+0' 
     parent.geometry("{0}x{1}+0+0".format(
      parent.winfo_screenwidth(), parent.winfo_screenheight())) 
     parent.overrideredirect(1) 

     parent.title('Listen') 
     parent.configure(background='#000000') 
     parent.displayFont = tkFont.Font(family="Unit-Bold", size=150) 
     self.process_queue() 

    def process_queue(self): 
     try: 
      scaled_vol = self.queue.get(0) 
      self.print_message(scaled_vol) 
     except Queue.Empty: 
      pass 

     self.parent.after(100, self.process_queue) 

    def print_message(self, messageString): 
     print 'message', messageString 
     self.message = tk.Message(
      self.parent, text=messageString, bg="#000000", 
      font=self.parent.displayFont, fg="#777777", justify="c") 
     self.message.place(relx=.5, rely=.5, anchor="c") 


def setup_audio(queue, stop_event): 
    data_in = aa.PCM(aa.PCM_CAPTURE, aa.PCM_NONBLOCK, 'hw:1') 
    data_in.setchannels(2) 
    data_in.setrate(44100) 
    data_in.setformat(aa.PCM_FORMAT_S16_LE) 

    data_in.setperiodsize(256) 

    while not stop_event.is_set(): 
     # Read data from device 
     l, data = data_in.read() 
     if l: 
      # catch frame error 
      try: 
       max_vol = audioop.rms(data, 2) 
       scaled_vol = max_vol // 4680 
       print scaled_vol 

       if scaled_vol <= 3: 
        # Too quiet, ignore 
        continue 

       total_vol += scaled_vol/10.0 

       if started and total_vol > 200.0: 
        started = False 
       elif started: 
        queue.put(scaled_vol) 

      except audioop.error, e: 
       if e.message != "not a whole number of frames": 
        raise e 


def main(): 
    root = tk.Tk() 
    queue = Queue.Queue() 
    window = Display(root, queue) 

    stop_event = threading.Event() 
    audio_thread = threading.Thread(target=setup_audio, 
            args=[queue, stop_event]) 
    audio_thread.start() 
    try: 
     root.mainloop() 
    finally: 
     stop_event.set() 
     audio_thread.join() 
     pass 


if __name__ == '__main__': 
    main() 

モニターは1920 x 1080です。モニターを確認する必要があります。完全のために

Answer 1

configure()を使用したバージョン：

#!/usr/bin/python 

import alsaaudio as aa 
import audioop 
import Tkinter as tk 
import tkFont 
import threading 
import Queue 

started = False 

class Display(object): 

    def __init__(self, parent, queue): 
     self.parent = parent 
     self.queue = queue 

     self._geom = '200x200+0+0' 
     parent.geometry("{0}x{1}+0+0".format(
      parent.winfo_screenwidth(), parent.winfo_screenheight())) 
     parent.overrideredirect(1) 

     parent.title('Listen') 
     parent.configure(background='#000000') 
     parent.displayFont = tkFont.Font(family="Unit-Bold", size=150) 
     self.create_message() 
     self.process_queue() 

    def process_queue(self): 
     try: 
      scaled_vol = self.queue.get(0) 
      self.message.configure(scaled_vol) 
     except Queue.Empty: 
      pass 

     self.parent.after(100, self.process_queue) 

    def create_message(self): 
     self.message = tk.Message(
      self.parent, text=messageString, bg="#000000", 
      font=self.parent.displayFont, fg="#777777", justify="c") 
     self.message.place(relx=.5, rely=.5, anchor="c") 

def setup_audio(queue, stop_event): 
    data_in = aa.PCM(aa.PCM_CAPTURE, aa.PCM_NONBLOCK, 'hw:1') 
    data_in.setchannels(2) 
    data_in.setrate(44100) 
    data_in.setformat(aa.PCM_FORMAT_S16_LE) 

    data_in.setperiodsize(256) 

    while not stop_event.is_set(): 
     # Read data from device 
     l, data = data_in.read() 
     if l: 
      # catch frame error 
      try: 
       max_vol = audioop.rms(data, 2) 
       scaled_vol = max_vol // 4680 
       print scaled_vol 

       if scaled_vol <= 3: 
        # Too quiet, ignore 
        continue 

       total_vol += scaled_vol/10.0 

       if started and total_vol > 200.0: 
        started = False 
       elif started: 
        queue.put(scaled_vol) 

      except audioop.error, e: 
       if e.message != "not a whole number of frames": 
        raise e 


def main(): 
    root = tk.Tk() 
    queue = Queue.Queue() 
    window = Display(root, queue) 

    stop_event = threading.Event() 
    audio_thread = threading.Thread(target=setup_audio, 
            args=[queue, stop_event]) 
    audio_thread.start() 
    try: 
     root.mainloop() 
    finally: 
     stop_event.set() 
     audio_thread.join() 
     pass 


if __name__ == '__main__': 
    main()