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#!/usr/bin/python3
#
# Generate chart from JSON using matplotlib.
#
# (See PiBench::Runner#save_svg in run.rb for JSON details).
#
import json
import sys
import os
import numpy as np
import matplotlib.pyplot as plt
# check arguments
if len(sys.argv) < 2:
print("Usage: {} json_data".format(sys.argv[0]))
exit(-1)
# decode json data from first argument
data = json.loads(sys.argv[1])
rows = data['rows'][::-1]
# plot values
plt.barh(
np.arange(len(rows)),
[row[1] for row in rows],
align = 'center',
alpha = 0.5,
tick_label = [row[0] for row in rows]
)
# set plot parameters
plt.yticks(fontsize = data['fontsize']['yticks'])
plt.xlim(0, data['xlimit'])
plt.xlabel(data['xlabel'])
plt.title(data['title'], fontsize = data['fontsize']['title'])
plt.tight_layout()
# set output size
fig = plt.gcf()
fig.set_size_inches(data['size'][0], data['size'][1])
# save plot
plt.savefig(data['path'], dpi = data['dpi'])
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