/usr/share/doc/tcl-snack-doc/examples/python/polarspec.py is in tcl-snack-doc 2.2.10.20090623-dfsg-4.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 | #! /usr/bin/env python
from Tkinter import *
from tkSnack import *
from math import *
root = Tkinter.Tk()
initializeSnack(root)
snd = Sound()
w = 300
h = 300
s = 100
n = 1024
type = StringVar()
type.set("FFT")
def stop():
snd.stop()
root.after_cancel(id)
def draw():
if (snd.length() > n) :
pos = snd.length() - n
spec = snd.dBPowerSpectrum(start=pos,fftlen=n,winlen=n,analysistype=type.get())
coords=[]
f=0.0001
for val in spec :
v = 6.282985 * log(f)/log(2.0)
a = 1.4*(val+s)
x = w/2+a*cos(v)
y = h/2+a*sin(v)
coords.append(x)
coords.append(y)
f = f + 16000.0 / n
c.delete('polar')
c.create_polygon(coords, tags='polar', fill='green')
if (snd.length(unit='sec') > 20) :
stop()
id = root.after(100,draw)
def start():
pos = 0
snd.record()
c.update_idletasks()
id = root.after(100,draw)
c = SnackCanvas(height=h, width=w, bg='black')
c.pack()
f = Frame()
f.pack()
Button(f, bitmap='snackRecord', fg='red', command=start).pack(side='left')
Button(f, bitmap='snackStop', command=stop).pack(side='left')
Radiobutton(f, text='FFT', variable=type, value='FFT').pack(side='left')
Radiobutton(f, text='LPC', variable=type, value='LPC').pack(side='left')
Button(f, text='Exit', command=root.quit).pack(side='left')
root.mainloop()
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