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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()
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