79 lines
2.3 KiB
Python
Executable File
79 lines
2.3 KiB
Python
Executable File
#!/usr/bin/env python2
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# Generate adxl345 accelerometer graphs
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#
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# Copyright (C) 2020 Kevin O'Connor <kevin@koconnor.net>
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#
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# This file may be distributed under the terms of the GNU GPLv3 license.
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import optparse
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import matplotlib
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def parse_log(logname):
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f = open(logname, 'r')
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out = []
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for line in f:
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if line.startswith('#'):
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continue
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parts = line.split(',')
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if len(parts) != 4:
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continue
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try:
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fparts = [float(p) for p in parts]
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except ValueError:
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continue
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out.append(fparts)
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return out
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def plot_accel(data, logname):
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half_smooth_samples = 15
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first_time = data[0][0]
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times = [d[0] - first_time for d in data]
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fig, axes = matplotlib.pyplot.subplots(nrows=3, sharex=True)
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axes[0].set_title("Accelerometer data (%s)" % (logname,))
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axis_names = ['x', 'y', 'z']
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for i in range(len(axis_names)):
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adata = [d[i+1] for d in data]
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avg = sum(adata) / len(adata)
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adata = [ad - avg for ad in adata]
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ax = axes[i]
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ax.plot(times, adata, alpha=0.8)
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ax.grid(True)
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ax.set_ylabel('%s accel (%+.3f)\n(mm/s^2)' % (axis_names[i], -avg))
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axes[-1].set_xlabel('Time (%+.3f)\n(s)' % (-first_time,))
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fig.tight_layout()
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return fig
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def setup_matplotlib(output_to_file):
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global matplotlib
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if output_to_file:
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matplotlib.rcParams.update({'figure.autolayout': True})
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matplotlib.use('Agg')
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import matplotlib.pyplot, matplotlib.dates, matplotlib.font_manager
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import matplotlib.ticker
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def main():
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# Parse command-line arguments
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usage = "%prog [options] <log>"
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opts = optparse.OptionParser(usage)
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opts.add_option("-o", "--output", type="string", dest="output",
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default=None, help="filename of output graph")
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options, args = opts.parse_args()
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if len(args) != 1:
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opts.error("Incorrect number of arguments")
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# Parse data
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data = parse_log(args[0])
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# Draw graph
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setup_matplotlib(options.output is not None)
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fig = plot_accel(data, args[0])
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# Show graph
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if options.output is None:
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matplotlib.pyplot.show()
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else:
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fig.set_size_inches(8, 6)
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fig.savefig(options.output)
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if __name__ == '__main__':
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main()
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