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Diffstat (limited to 'gr-utils/src/python/gr_plot_const')
| -rwxr-xr-x | gr-utils/src/python/gr_plot_const | 250 |
1 files changed, 250 insertions, 0 deletions
diff --git a/gr-utils/src/python/gr_plot_const b/gr-utils/src/python/gr_plot_const new file mode 100755 index 000000000..8873e5b7e --- /dev/null +++ b/gr-utils/src/python/gr_plot_const @@ -0,0 +1,250 @@ +#!/usr/bin/env python +# +# Copyright 2007,2008,2011 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. +# + +try: + import scipy +except ImportError: + print "Please install SciPy to run this script (http://www.scipy.org/)" + raise SystemExit, 1 + +try: + from pylab import * + from matplotlib.font_manager import fontManager, FontProperties +except ImportError: + print "Please install Matplotlib to run this script (http://matplotlib.sourceforge.net/)" + raise SystemExit, 1 + +from optparse import OptionParser + +class draw_constellation: + def __init__(self, filename, options): + self.hfile = open(filename, "r") + self.block_length = options.block + self.start = options.start + self.sample_rate = options.sample_rate + + self.datatype = scipy.complex64 + self.sizeof_data = self.datatype().nbytes # number of bytes per sample in file + + self.axis_font_size = 16 + self.label_font_size = 18 + self.title_font_size = 20 + + # Setup PLOT + self.fig = figure(1, figsize=(16, 9), facecolor='w') + rcParams['xtick.labelsize'] = self.axis_font_size + rcParams['ytick.labelsize'] = self.axis_font_size + + self.text_file = figtext(0.10, 0.95, ("File: %s" % filename), weight="heavy", size=16) + self.text_file_pos = figtext(0.10, 0.90, "File Position: ", weight="heavy", size=16) + self.text_block = figtext(0.40, 0.90, ("Block Size: %d" % self.block_length), + weight="heavy", size=16) + self.text_sr = figtext(0.60, 0.90, ("Sample Rate: %.2f" % self.sample_rate), + weight="heavy", size=16) + self.make_plots() + + self.button_left_axes = self.fig.add_axes([0.45, 0.01, 0.05, 0.05], frameon=True) + self.button_left = Button(self.button_left_axes, "<") + self.button_left_callback = self.button_left.on_clicked(self.button_left_click) + + self.button_right_axes = self.fig.add_axes([0.50, 0.01, 0.05, 0.05], frameon=True) + self.button_right = Button(self.button_right_axes, ">") + self.button_right_callback = self.button_right.on_clicked(self.button_right_click) + + self.xlim = self.sp_iq.get_xlim() + + self.manager = get_current_fig_manager() + connect('draw_event', self.zoom) + connect('key_press_event', self.click) + connect('button_press_event', self.mouse_button_callback) + show() + + def get_data(self): + self.text_file_pos.set_text("File Position: %d" % (self.hfile.tell()//self.sizeof_data)) + try: + iq = scipy.fromfile(self.hfile, dtype=self.datatype, count=self.block_length) + except MemoryError: + print "End of File" + else: + # retesting length here as newer version of scipy does not throw a MemoryError, just + # returns a zero-length array + if(len(iq) > 0): + self.reals = scipy.array([r.real for r in iq]) + self.imags = scipy.array([i.imag for i in iq]) + + self.time = scipy.array([i*(1/self.sample_rate) for i in range(len(self.reals))]) + return True + else: + print "End of File" + return False + + def make_plots(self): + # if specified on the command-line, set file pointer + self.hfile.seek(self.sizeof_data*self.start, 1) + + r = self.get_data() + + # Subplot for real and imaginary parts of signal + self.sp_iq = self.fig.add_subplot(2,1,1, position=[0.075, 0.2, 0.4, 0.6]) + self.sp_iq.set_title(("I&Q"), fontsize=self.title_font_size, fontweight="bold") + self.sp_iq.set_xlabel("Time (s)", fontsize=self.label_font_size, fontweight="bold") + self.sp_iq.set_ylabel("Amplitude (V)", fontsize=self.label_font_size, fontweight="bold") + self.plot_iq = self.sp_iq.plot(self.time, self.reals, 'bo-', self.time, self.imags, 'ro-') + + # Subplot for constellation plot + self.sp_const = self.fig.add_subplot(2,2,1, position=[0.575, 0.2, 0.4, 0.6]) + self.sp_const.set_title(("Constellation"), fontsize=self.title_font_size, fontweight="bold") + self.sp_const.set_xlabel("Inphase", fontsize=self.label_font_size, fontweight="bold") + self.sp_const.set_ylabel("Qaudrature", fontsize=self.label_font_size, fontweight="bold") + self.plot_const = self.sp_const.plot(self.reals, self.imags, 'bo') + + # Add plots to mark current location of point between time and constellation plots + self.indx = 0 + self.plot_iq += self.sp_iq.plot([self.time[self.indx],], [self.reals[self.indx],], 'mo', ms=8) + self.plot_iq += self.sp_iq.plot([self.time[self.indx],], [self.imags[self.indx],], 'mo', ms=8) + self.plot_const += self.sp_const.plot([self.reals[self.indx],], [self.imags[self.indx],], 'mo', ms=12) + + # Adjust axis + self.sp_iq.axis([self.time.min(), self.time.max(), + 1.5*min([self.reals.min(), self.imags.min()]), + 1.5*max([self.reals.max(), self.imags.max()])]) + self.sp_const.axis([-2, 2, -2, 2]) + + draw() + + def update_plots(self): + self.plot_iq[0].set_data([self.time, self.reals]) + self.plot_iq[1].set_data([self.time, self.imags]) + self.sp_iq.axis([self.time.min(), self.time.max(), + 1.5*min([self.reals.min(), self.imags.min()]), + 1.5*max([self.reals.max(), self.imags.max()])]) + + self.plot_const[0].set_data([self.reals, self.imags]) + self.sp_const.axis([-2, 2, -2, 2]) + draw() + + def zoom(self, event): + newxlim = scipy.array(self.sp_iq.get_xlim()) + curxlim = scipy.array(self.xlim) + if(newxlim[0] != curxlim[0] or newxlim[1] != curxlim[1]): + self.xlim = newxlim + r = self.reals[int(ceil(self.xlim[0])) : int(ceil(self.xlim[1]))] + i = self.imags[int(ceil(self.xlim[0])) : int(ceil(self.xlim[1]))] + + self.plot_const[0].set_data(r, i) + self.sp_const.axis([-2, 2, -2, 2]) + self.manager.canvas.draw() + draw() + + def click(self, event): + forward_valid_keys = [" ", "down", "right"] + backward_valid_keys = ["up", "left"] + trace_forward_valid_keys = [">",] + trace_backward_valid_keys = ["<",] + + if(find(event.key, forward_valid_keys)): + self.step_forward() + + elif(find(event.key, backward_valid_keys)): + self.step_backward() + + elif(find(event.key, trace_forward_valid_keys)): + self.indx = min(self.indx+1, len(self.time)-1) + self.set_trace(self.indx) + + elif(find(event.key, trace_backward_valid_keys)): + self.indx = max(0, self.indx-1) + self.set_trace(self.indx) + + def button_left_click(self, event): + self.step_backward() + + def button_right_click(self, event): + self.step_forward() + + def step_forward(self): + r = self.get_data() + if(r): + self.update_plots() + + def step_backward(self): + # Step back in file position + if(self.hfile.tell() >= 2*self.sizeof_data*self.block_length ): + self.hfile.seek(-2*self.sizeof_data*self.block_length, 1) + else: + self.hfile.seek(-self.hfile.tell(),1) + r = self.get_data() + if(r): + self.update_plots() + + + def mouse_button_callback(self, event): + x, y = event.xdata, event.ydata + + if x is not None and y is not None: + if(event.inaxes == self.sp_iq): + self.indx = searchsorted(self.time, [x]) + self.set_trace(self.indx) + + + def set_trace(self, indx): + self.plot_iq[2].set_data(self.time[indx], self.reals[indx]) + self.plot_iq[3].set_data(self.time[indx], self.imags[indx]) + self.plot_const[1].set_data(self.reals[indx], self.imags[indx]) + draw() + + +def find(item_in, list_search): + try: + return list_search.index(item_in) != None + except ValueError: + return False + + +def main(): + usage="%prog: [options] input_filename" + description = "Takes a GNU Radio complex binary file and displays the I&Q data versus time and the constellation plot (I vs. Q). You can set the block size to specify how many points to read in at a time and the start position in the file. By default, the system assumes a sample rate of 1, so in time, each sample is plotted versus the sample number. To set a true time axis, set the sample rate (-R or --sample-rate) to the sample rate used when capturing the samples." + + parser = OptionParser(conflict_handler="resolve", usage=usage, description=description) + parser.add_option("-B", "--block", type="int", default=1000, + help="Specify the block size [default=%default]") + parser.add_option("-s", "--start", type="int", default=0, + help="Specify where to start in the file [default=%default]") + parser.add_option("-R", "--sample-rate", type="float", default=1.0, + help="Set the sampler rate of the data [default=%default]") + + (options, args) = parser.parse_args () + if len(args) != 1: + parser.print_help() + raise SystemExit, 1 + filename = args[0] + + dc = draw_constellation(filename, options) + +if __name__ == "__main__": + try: + main() + except KeyboardInterrupt: + pass + + + |