/usr/share/expeyes/eyes-junior/induction.py is in expeyes 3.2.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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expEYES program
Author : Ajith Kumar B.P, bpajith@gmail.com
License : GNU GPL version 3
'''
import gettext
gettext.bindtextdomain("expeyes")
gettext.textdomain('expeyes')
_ = gettext.gettext
from Tkinter import *
import expeyes.eyesj as eyes, expeyes.eyeplot as eyeplot, expeyes.eyemath as eyemath, time, math, sys
TIMER = 100
WIDTH = 500 # width of drawing canvas
HEIGHT = 350 # height
VPERDIV = 1.0 # Volts per division, vertical scale
delay = 500 # Time interval between samples
NP = 400 # Number of samples
data = [ [], [] ]
history = [] # Data store
trial = 0 # trial number
data = [ [], [] ] # Current & Voltage
def find_peaks(ta,va): # returns the index of the peaks found
vmin = 5.0
vmax = -5.0
p1 = 0 # index of the peaks
p2 = 0
t1 = t2 = 0
size = len(ta)
for i in range(size):
if va[i] < vmin:
vmin = va[i]
p1 = i
if va[i] > vmax:
vmax = va[i]
p2 = i
#print p1,p2,vmin, vmax
if p1 < p2: # return left side peak first
return p1,p2
else:
return p2,p1
def base_scan():
global data, history, trial, NP, delay, noise
t, v = p.capture_hr(1,NP,delay)
g.delete_lines()
g.line(t,v,trial)
running = True
data = [ [], [] ]
p1,p2 = find_peaks(t,v)
noise = abs(v[p1])
msgwin.config(text = _('Voltage Scan on Coil Done. Noise Voltage = %5.3f V')%noise)
root.after(TIMER, update)
def update():
global data, history, trial, NP, delay, noise
t, v= p.capture_hr(1,NP,delay) # Scan for 5 times more
p1,p2 = find_peaks(t,v)
print v[p1], v[p2]
if abs(v[p1] - noise) > 0.5 and p1 < .9*NP: # Signal at least 0.5 volts above noise
index = p1-50
tbeg = t[index]
'''
tn = []
vn = []
while index < p1 + 150:
#print index
tn.append(t[index]-tbeg)
vn.append(v[index])
index += 1
'''
g.delete_lines()
g.line(t,v,trial)
data = [t,v]
s = _('Peak voltages %5.2f and %5.3f separated by %5.3f msec') %(v[p1], v[p2], t[p2]-t[p1])
msgwin.config(text = s)
#print len(tn), len(vn), v[p1], v[p2]
history.append(data)
trial += 1
return
root.after(TIMER, update)
def clear():
global history, trial
g.delete_lines()
history = []
trial = 0
def save():
global history
s = fn.get()
if s == '':
return
p.save(history, s)
msgwin.config(text = _('Data saved to file ')+s)
def viewall(): # Send the data to Xmgrace
global history
g.delete_lines()
i = 0
for t,v in history:
g.line(t,v,i)
i += 1
p = eyes.open()
root = Tk()
Canvas(root, width = WIDTH, height = 5).pack(side=TOP) # Some space at the top
g = eyeplot.graph(root, width=WIDTH, height=HEIGHT) # make plot objects using draw.disp
g.setWorld(0,-5*VPERDIV, NP * delay * 0.001, 5*VPERDIV,_('mS'),_('V'))
cf = Frame(root, width = WIDTH, height = 10)
cf.pack(side=TOP, fill = BOTH, expand = 1)
b = Button(cf,text =_('Start Scanning'), command= base_scan)
b.pack(side=LEFT, anchor = SW)
b = Button(cf,text =_('Save to'), command=save)
b.pack(side=LEFT, anchor = SW)
fn = Entry(cf,width = 10, bg = 'white')
fn.pack(side=LEFT, anchor = SW)
fn.insert(END,'ind.dat')
b = Button(cf,text =_('QUIT'), command=sys.exit)
b.pack(side=RIGHT, anchor = SW)
b = Button(cf,text =_('VIEW'), command=viewall)
b.pack(side=RIGHT, anchor = SW)
b4 = Button(cf, text = _('CLEAR'), command = clear)
b4.pack(side = RIGHT, anchor = N)
mf = Frame(root) # Message Frame below command frame.
mf.pack(side=TOP, anchor = SW)
msgwin = Label(mf,text = _('Messages'), fg = 'blue')
msgwin.pack(side=LEFT, anchor = SW)
eyeplot.pop_image('pics/induction.png', _('Electromagnetic Induction'))
root.title(_('EYESJUN: Electromagnetic Induction'))
root.mainloop()
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