File: gr_constellation_plot

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#!/usr/bin/env python
#
# Copyright 2012,2018 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.
#

from gnuradio import gr
from gnuradio import blocks
from gnuradio.eng_option import eng_option
from optparse import OptionParser
import os, sys

try:
    from gnuradio import qtgui
    from PyQt5 import QtWidgets, Qt
    import sip
except ImportError:
    sys.stderr.write("Error: Program requires PyQt5 and gr-qtgui.\n")
    sys.exit(1)

try:
    import scipy
except ImportError:
    sys.stderr.write("Error: Scipy required (www.scipy.org).\n")
    sys.exit(1)

try:
    from gnuradio.qtgui.plot_constellation_form import *
    from gnuradio.qtgui.plot_base import *
except ImportError:
    from plot_constellation_form import *
    from plot_base import *

class my_top_block(gr.top_block):
    def __init__(self, filelist, start, nsamples, max_nsamples):
        gr.top_block.__init__(self)

        self._filelist = filelist
        self._samp_rate = 0
        self._center_freq = 0
        self._start = start
        self._max_nsamps = max_nsamples
        self._nsigs = len(self._filelist)
        self._nsamps = nsamples
        self._auto_scale = True

        self._y_min = -20
        self._y_max = 20
        self._y_range = 4
        self._y_value = 2
        self.gui_y_axis = None

        self.qapp = QtWidgets.QApplication(sys.argv)

        self.skip = blocks.skiphead(gr.sizeof_gr_complex, self._start)
        self.gui_snk = qtgui.const_sink_c(self._nsamps, "", self._nsigs)
        n = 0
        self.srcs = list()
        self._data_min = sys.maxint
        self._data_max = -sys.maxint - 1
        for f in filelist:
            data,_min,_max = read_samples_c(f, self._start, self._nsamps)
            self.srcs.append(blocks.vector_source_c(data))

            if(_min < self._data_min):
                self._data_min = _min
            if(_max > self._data_max):
                self._data_max = _max

            # Set default labels based on file names
            fname = f.split("/")[-1]
            self.gui_snk.set_line_label(n, "{0}".format(fname))
            n += 1

        self.connect(self.srcs[0], self.skip)
        self.connect(self.skip, (self.gui_snk, 0))

        for i,s in enumerate(self.srcs[1:]):
            self.connect(s, (self.gui_snk, i+1))

        self.gui_snk.enable_menu(False)

        # Get Python Qt references
        pyQt  = self.gui_snk.pyqwidget()
        self.pyWin = sip.wrapinstance(pyQt, QtWidgets.QWidget)

    def get_gui(self):
        return self.pyWin

    def reset(self, newstart, newnsamps):
        self.stop()
        self.wait()

        self._start = newstart

        for s,f in zip(self.srcs, self._filelist):
            data,_min,_max = read_samples_c(f, self._start, newnsamps)
            s.set_data(data)
            if(len(data) < newnsamps):
                newnsamps = len(data)

        self._nsamps = newnsamps
        self.gui_snk.set_nsamps(self._nsamps)

        self.start()

    def set_y_axis(self, y_min, y_max):
        y_min = -y_max
        self.gui_snk.set_y_axis(y_min, y_max)
        self.gui_snk.set_x_axis(y_min, y_max)
        return y_min, y_max

    def auto_scale(self, state):
        if(state > 0):
            self.set_y_axis(self._data_min, self._data_max)
            self._auto_scale = True
            self._y_value = self._data_max
            self._y_range = self._data_max - self._data_min
            self._y_min = 10*self._data_min
            self._y_max = 10*self._data_max

            if(self.gui_y_axis):
                self.gui_y_axis(self._data_min, self._data_max)
        else:
            self._auto_scale = False


def main():
    description = "Plots the constellations of a list of files."
    parser = OptionParser(option_class=eng_option, description=description,
                          conflict_handler="resolve")
    parser.add_option("-N", "--nsamples", type="int", default=1000000,
                      help="Set the number of samples to display [default=%default]")
    parser.add_option("-S", "--start", type="int", default=0,
                      help="Starting sample number [default=%default]")
    (options, args) = parser.parse_args()

    if(len(args) < 1):
        parser.print_help()
        sys.exit(0)

    filelist = list(args)

    nsamples = options.nsamples

    # Find the smallest number of samples in all files and use that as
    # a maximum value possible.
    filesizes = []
    for f in filelist:
        if(os.path.exists(f)):
            filesizes.append(os.path.getsize(f) / gr.sizeof_gr_complex)
    max_nsamples = min(filesizes)

    tb = my_top_block(filelist,
                      options.start, nsamples, max_nsamples);

    main_box = plot_constellation_form(tb, 'GNU Radio Constellation Plot', 10000.0)
    for n in xrange(tb._nsigs):
        main_box._style_edit[n].setCurrentIndex(0)
    main_box.show()

    tb.run()
    tb.qapp.exec_()

if __name__ == "__main__":
    try:
        main()
    except KeyboardInterrupt:
        pass