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#
# Copyright 2009 Free Software Foundation, Inc.
#
# This file is part of GNU Radio
#
# GNU Radio is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Radio is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Radio; see the file COPYING. If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street,
# Boston, MA 02110-1301, USA.
#
import threading
import time
import math
import wx
##################################################
# Number formatting
##################################################
def get_exp(num):
"""
Get the exponent of the number in base 10.
@param num the floating point number
@return the exponent as an integer
"""
if num == 0: return 0
return int(math.floor(math.log10(abs(num))))
def get_si_components(num):
"""
Get the SI units for the number.
Extract the coeff and exponent of the number.
The exponent will be a multiple of 3.
@param num the floating point number
@return the tuple coeff, exp, prefix
"""
num = float(num)
exp = get_exp(num)
exp -= exp%3
exp = min(max(exp, -24), 24) #bounds on SI table below
prefix = {
24: 'Y', 21: 'Z',
18: 'E', 15: 'P',
12: 'T', 9: 'G',
6: 'M', 3: 'k',
0: '',
-3: 'm', -6: 'u',
-9: 'n', -12: 'p',
-15: 'f', -18: 'a',
-21: 'z', -24: 'y',
}[exp]
coeff = num/10**exp
return coeff, exp, prefix
def sci_format(num):
"""
Format a floating point number into scientific notation.
@param num the number to format
@return a label string
"""
coeff, exp, prefix = get_si_components(num)
if -3 <= exp < 3: return '%g'%num
return '%.3ge%d'%(coeff, exp)
def eng_format(num, units=''):
"""
Format a floating point number into engineering notation.
@param num the number to format
@param units the units to append
@return a label string
"""
coeff, exp, prefix = get_si_components(num)
if -3 <= exp < 3: return '%g'%num
return '%g%s%s%s'%(coeff, units and ' ' or '', prefix, units)
##################################################
# Interface with thread safe lock/unlock
##################################################
class mutex(object):
_lock = threading.Lock()
def lock(self): self._lock.acquire()
def unlock(self): self._lock.release()
##################################################
# Periodic update thread for point label
##################################################
class point_label_thread(threading.Thread, mutex):
def __init__(self, plotter):
self._plotter = plotter
self._coor_queue = list()
#bind plotter mouse events
self._plotter.Bind(wx.EVT_MOTION, lambda evt: self.enqueue(evt.GetPosition()))
self._plotter.Bind(wx.EVT_LEAVE_WINDOW, lambda evt: self.enqueue(None))
self._plotter.Bind(wx.EVT_RIGHT_DOWN, lambda evt: plotter.enable_point_label(not plotter.enable_point_label()))
#start the thread
threading.Thread.__init__(self)
self.start()
def enqueue(self, coor):
self.lock()
self._coor_queue.append(coor)
self.unlock()
def run(self):
last_ts = time.time()
last_coor = coor = None
try:
while True:
time.sleep(1.0/30.0)
self.lock()
#get most recent coor change
if self._coor_queue:
coor = self._coor_queue[-1]
self._coor_queue = list()
self.unlock()
#update if coor change, or enough time expired
if last_coor != coor or (time.time() - last_ts) > (1.0/2.0):
self._plotter.set_point_label_coordinate(coor)
last_coor = coor
last_ts = time.time()
except wx.PyDeadObjectError: pass
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