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# -*- encoding: utf-8 -*-
import os
import shutil
import numpy as np
import nose
from nose.plugins.skip import SkipTest
import matplotlib as mpl
import matplotlib.pyplot as plt
from matplotlib.compat import subprocess
from matplotlib.testing.compare import compare_images, ImageComparisonFailure
from matplotlib.testing.decorators import _image_directories
baseline_dir, result_dir = _image_directories(lambda: 'dummy func')
def check_for(texsystem):
header = r"""
\documentclass{minimal}
\usepackage{pgf}
\begin{document}
\typeout{pgfversion=\pgfversion}
\makeatletter
\@@end
"""
try:
latex = subprocess.Popen(["xelatex", "-halt-on-error"],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
stdout, stderr = latex.communicate(header.encode("utf8"))
except OSError:
return False
return latex.returncode == 0
def switch_backend(backend):
def switch_backend_decorator(func):
def backend_switcher(*args, **kwargs):
try:
prev_backend = mpl.get_backend()
mpl.rcdefaults()
plt.switch_backend(backend)
result = func(*args, **kwargs)
finally:
plt.switch_backend(prev_backend)
return result
return nose.tools.make_decorator(func)(backend_switcher)
return switch_backend_decorator
def compare_figure(fname):
actual = os.path.join(result_dir, fname)
plt.savefig(actual)
expected = os.path.join(result_dir, "expected_%s" % fname)
shutil.copyfile(os.path.join(baseline_dir, fname), expected)
err = compare_images(expected, actual, tol=14)
if err:
raise ImageComparisonFailure('images not close: %s vs. %s' % (actual, expected))
###############################################################################
def create_figure():
plt.figure()
x = np.linspace(0, 1, 15)
plt.plot(x, x**2, "b-")
plt.plot(x, 1-x**2, "g>")
plt.plot([0.9], [0.5], "ro", markersize=3)
plt.text(0.9, 0.5, u'unicode (ü, °, µ) and math ($\\mu_i = x_i^2$)', ha='right', fontsize=20)
plt.ylabel(u'sans-serif with math $\\frac{\\sqrt{x}}{y^2}$..', family='sans-serif')
# test compiling a figure to pdf with xelatex
@switch_backend('pgf')
def test_xelatex():
if not check_for('xelatex'):
raise SkipTest('xelatex + pgf is required')
rc_xelatex = {'font.family': 'serif',
'pgf.rcfonts': False,}
mpl.rcParams.update(rc_xelatex)
create_figure()
compare_figure('pgf_xelatex.pdf')
# test compiling a figure to pdf with pdflatex
@switch_backend('pgf')
def test_pdflatex():
if not check_for('pdflatex'):
raise SkipTest('pdflatex + pgf is required')
rc_pdflatex = {'font.family': 'serif',
'pgf.rcfonts': False,
'pgf.texsystem': 'pdflatex',
'pgf.preamble': [r'\usepackage[utf8x]{inputenc}',
r'\usepackage[T1]{fontenc}']}
mpl.rcParams.update(rc_pdflatex)
create_figure()
compare_figure('pgf_pdflatex.pdf')
# test updating the rc parameters for each figure
@switch_backend('pgf')
def test_rcupdate():
if not check_for('xelatex') or not check_for('pdflatex'):
raise SkipTest('xelatex and pdflatex + pgf required')
rc_sets = []
rc_sets.append({'font.family': 'sans-serif',
'font.size': 30,
'figure.subplot.left': .2,
'lines.markersize': 10,
'pgf.rcfonts': False,
'pgf.texsystem': 'xelatex'})
rc_sets.append({'font.family': 'monospace',
'font.size': 10,
'figure.subplot.left': .1,
'lines.markersize': 20,
'pgf.rcfonts': False,
'pgf.texsystem': 'pdflatex',
'pgf.preamble': [r'\usepackage[utf8x]{inputenc}',
r'\usepackage[T1]{fontenc}',
r'\usepackage{sfmath}']})
for i, rc_set in enumerate(rc_sets):
mpl.rcParams.update(rc_set)
create_figure()
compare_figure('pgf_rcupdate%d.pdf' % (i+1))
# test backend-side clipping, since large numbers are not supported by TeX
@switch_backend('pgf')
def test_pathclip():
if not check_for('xelatex'):
raise SkipTest('xelatex + pgf is required')
plt.figure()
plt.plot([0., 1e100], [0., 1e100])
plt.xlim(0, 1)
plt.ylim(0, 1)
# this test passes if compiling/saving to pdf works (no image comparison)
plt.savefig(os.path.join(result_dir, "pgf_pathclip.pdf"))
if __name__ == '__main__':
import nose
nose.runmodule(argv=['-s','--with-doctest'], exit=False)
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