scripts: Small improvements for input shaper and accelerometer scripts

Signed-off-by: Dmitry Butyugin <dmbutyugin@google.com>

scripts/calibrate_shaper.py

@@ -7,11 +7,14 @@
 # This file may be distributed under the terms of the GNU GPLv3 license.
 from __future__ import print_function
 import optparse, os, sys
+from textwrap import wrap
 import numpy as np, matplotlib
 sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)),
                              '..', 'klippy', 'extras'))
 from shaper_calibrate import CalibrationData, ShaperCalibrate
 
+MAX_TITLE_LENGTH=65
+
 def parse_log(logname):
     with open(logname) as f:
         for header in f:
@@ -61,7 +64,7 @@ def calibrate_shaper(datas, csv_output):
 # Plot frequency response and suggested input shapers
 ######################################################################
 
-def plot_freq_response(calibration_data, shapers_vals,
+def plot_freq_response(lognames, calibration_data, shapers_vals,
                        selected_shaper, max_freq):
     freqs = calibration_data.freq_bins
     psd = calibration_data.psd_sum[freqs <= max_freq]
@@ -83,10 +86,8 @@ def plot_freq_response(calibration_data, shapers_vals,
     ax.plot(freqs, py, label='Y', color='green')
     ax.plot(freqs, pz, label='Z', color='blue')
 
-    if shapers_vals:
+    title = "Frequency response and shapers (%s)" % (', '.join(lognames))
-        ax.set_title("Frequency response and shapers")
+    ax.set_title("\n".join(wrap(title, MAX_TITLE_LENGTH)))
-    else:
-        ax.set_title("Frequency response")
     ax.xaxis.set_minor_locator(matplotlib.ticker.AutoMinorLocator())
     ax.yaxis.set_minor_locator(matplotlib.ticker.AutoMinorLocator())
     ax.xaxis.set_minor_locator(matplotlib.ticker.AutoMinorLocator())
@@ -94,9 +95,7 @@ def plot_freq_response(calibration_data, shapers_vals,
     ax.ticklabel_format(axis='y', style='scientific', scilimits=(0,0))
     ax.grid(which='major', color='grey')
     ax.grid(which='minor', color='lightgrey')
-    ax.legend(loc='upper right', prop=fontP)
 
-    if shapers_vals:
     ax2 = ax.twinx()
     ax2.set_ylabel('Shaper vibration reduction (ratio)')
     best_shaper_vals = None
@@ -104,13 +103,17 @@ def plot_freq_response(calibration_data, shapers_vals,
         label = "%s (%.1f Hz)" % (name.upper(), freq)
         linestyle = 'dotted'
         if name == selected_shaper:
-                label += ' (selected)'
             linestyle = 'dashdot'
             best_shaper_vals = vals
         ax2.plot(freqs, vals, label=label, linestyle=linestyle)
     ax.plot(freqs, psd * best_shaper_vals,
             label='After\nshaper', color='cyan')
-        ax2.legend(loc='upper left', prop=fontP)
+    # A hack to add a human-readable shaper recommendation to legend
+    ax2.plot([], [], ' ',
+             label="Recommended shaper: %s" % (selected_shaper.upper()))
+
+    ax.legend(loc='upper left', prop=fontP)
+    ax2.legend(loc='upper right', prop=fontP)
 
     fig.tight_layout()
     return fig
@@ -152,7 +155,7 @@ def main():
         # Draw graph
         setup_matplotlib(options.output is not None)
 
-        fig = plot_freq_response(calibration_data, shapers_vals,
+        fig = plot_freq_response(args, calibration_data, shapers_vals,
                                  selected_shaper, options.max_freq)
 
         # Show graph

scripts/graph_accelerometer.py

@@ -12,10 +12,20 @@ sys.path.append(os.path.join(os.path.dirname(os.path.realpath(__file__)),
                              '..', 'klippy', 'extras'))
 from shaper_calibrate import ShaperCalibrate
 
-MAX_TITLE_LENGTH=80
+MAX_TITLE_LENGTH=65
 
-def parse_log(logname):
+def parse_log(logname, opts):
+    with open(logname) as f:
+        for header in f:
+            if not header.startswith('#'):
+                break
+        if not header.startswith('freq,psd_x,psd_y,psd_z,psd_xyz'):
+            # Raw accelerometer data
             return np.loadtxt(logname, comments='#', delimiter=',')
+    # Power spectral density data or shaper calibration data
+    opts.error("File %s does not contain raw accelerometer data and therefore "
+               "is not supported by graph_accelerometer.py script. Please use "
+               "calibrate_shaper.py script to process it instead." % (logname,))
 
 ######################################################################
 # Raw accelerometer graphing
@@ -185,7 +195,7 @@ def setup_matplotlib(output):
 
 def main():
     # Parse command-line arguments
-    usage = "%prog [options] <logs>"
+    usage = "%prog [options] <raw logs>"
     opts = optparse.OptionParser(usage)
     opts.add_option("-o", "--output", type="string", dest="output",
                     default=None, help="filename of output graph")
@@ -205,7 +215,7 @@ def main():
         opts.error("Incorrect number of arguments")
 
     # Parse data
-    datas = [parse_log(fn) for fn in args]
+    datas = [parse_log(fn, opts) for fn in args]
 
     setup_matplotlib(options.output)
 
@@ -215,6 +225,8 @@ def main():
         if options.compare:
             opts.error("comparison mode is not supported with csv output")
         if options.specgram:
+            if len(args) > 1:
+                opts.error("Only 1 input is supported in specgram mode")
             pdata, bins, t = calc_specgram(datas[0], options.axis)
             write_specgram(pdata, bins, t, options.output)
         else:
@@ -223,8 +235,12 @@ def main():
 
     # Draw graph
     if options.raw:
+        if len(args) > 1:
+            opts.error("Only 1 input is supported in raw mode")
         fig = plot_accel(datas[0], args[0])
     elif options.specgram:
+        if len(args) > 1:
+            opts.error("Only 1 input is supported in specgram mode")
         fig = plot_specgram(datas[0], args[0], options.max_freq, options.axis)
     elif options.compare:
         fig = plot_compare_frequency(datas, args, options.max_freq)