Tempo estimation

13_tempo_estimation_part.py

time_list = []
def tap_estimate():
    global time_list, scale
    time_list.append(time.time())
    list_len = len(time_list)
    N = 6
    if list_len > 1:
        # If two time far away from each other 
        # throw away the former times, only left the last one
        if time_list[-1] - time_list[-2] > 2:
            time_list = time_list[-1:]
        else:
            if list_len < N:
                interval = (time_list[-1] - time_list[0]) / (list_len - 1)
            else:
                interval = (time_list[-1] - time_list[-N]) / (N - 1)
            tempo = int(60/interval)
            scale.set(tempo)
    else:
        # Keep tapping 
        pass 
    # print(time_list)


def key_pressed(event):
    global ON 
    if event.char == ' ':
        ON = not ON
    elif event.char == 't':
        tap_estimate()