test_usetex.py
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import numpy as np
import pytest
import matplotlib as mpl
from matplotlib.testing.decorators import check_figures_equal, image_comparison
import matplotlib.pyplot as plt
if not mpl.checkdep_usetex(True):
pytestmark = pytest.mark.skip('Missing TeX of Ghostscript or dvipng')
@image_comparison(
baseline_images=['test_usetex'],
extensions=['pdf', 'png'],
style="mpl20")
def test_usetex():
mpl.rcParams['text.usetex'] = True
fig = plt.figure()
ax = fig.add_subplot(111)
kwargs = {"verticalalignment": "baseline", "size": 24,
"bbox": dict(pad=0, edgecolor="k", facecolor="none")}
ax.text(0.2, 0.7,
# the \LaTeX macro exercises character sizing and placement,
# \left[ ... \right\} draw some variable-height characters,
# \sqrt and \frac draw horizontal rules, \mathrm changes the font
r'\LaTeX\ $\left[\int\limits_e^{2e}'
r'\sqrt\frac{\log^3 x}{x}\,\mathrm{d}x \right\}$',
**kwargs)
ax.text(0.2, 0.3, "lg", **kwargs)
ax.text(0.4, 0.3, r"$\frac{1}{2}\pi$", **kwargs)
ax.text(0.6, 0.3, "$p^{3^A}$", **kwargs)
ax.text(0.8, 0.3, "$p_{3_2}$", **kwargs)
for x in {t.get_position()[0] for t in ax.texts}:
ax.axvline(x)
for y in {t.get_position()[1] for t in ax.texts}:
ax.axhline(y)
ax.set_axis_off()
@check_figures_equal()
def test_empty(fig_test, fig_ref):
mpl.rcParams['text.usetex'] = True
fig_test.text(.5, .5, "% a comment")
@check_figures_equal()
def test_unicode_minus(fig_test, fig_ref):
mpl.rcParams['text.usetex'] = True
fig_test.text(.5, .5, "$-$")
fig_ref.text(.5, .5, "\N{MINUS SIGN}")
def test_mathdefault():
plt.rcParams["axes.formatter.use_mathtext"] = True
fig = plt.figure()
fig.add_subplot().set_xlim(-1, 1)
# Check that \mathdefault commands generated by tickers don't cause
# problems when later switching usetex on.
mpl.rcParams['text.usetex'] = True
fig.canvas.draw()
def test_minus_no_descent():
# Test special-casing of minus descent in DviFont._height_depth_of, by
# checking that overdrawing a 1 and a -1 results in an overall height
# equivalent to drawing either of them separately.
mpl.style.use("mpl20")
heights = {}
fig = plt.figure()
for vals in [(1,), (-1,), (-1, 1)]:
fig.clf()
for x in vals:
fig.text(.5, .5, f"${x}$", usetex=True)
fig.canvas.draw()
# The following counts the number of non-fully-blank pixel rows.
heights[vals] = ((np.array(fig.canvas.buffer_rgba())[..., 0] != 255)
.any(axis=1).sum())
assert len({*heights.values()}) == 1
def test_textcomp_full():
plt.rcParams["text.latex.preamble"] = r"\usepackage[full]{textcomp}"
fig = plt.figure()
fig.text(.5, .5, "hello, world", usetex=True)
fig.canvas.draw()