Fix hatch linewidth in PGF

oscargus · anntzer · oscargus · commit 2acf945907f5 · 2022-10-24T18:00:56.000+02:00
Co-authored-by: Antony Lee &lt;anntzer.lee@gmail.com&gt;
diff --git a/lib/matplotlib/backends/backend_pgf.py b/lib/matplotlib/backends/backend_pgf.py
@@ -477,6 +477,9 @@ def draw_path(self, gc, path, transform, rgbFace=None):
                      r"{\pgfqpoint{0in}{0in}}{\pgfqpoint{1in}{1in}}")
             _writeln(self.fh, r"\pgfusepath{clip}")
             scale = mpl.transforms.Affine2D().scale(self.dpi)
+            lw = (mpl.rcParams["hatch.linewidth"]
+                  * mpl_pt_to_in * latex_in_to_pt)
+            _writeln(self.fh, r"\pgfsetlinewidth{%fpt}" % lw)
             self._print_pgf_path(None, gc.get_hatch_path(), scale)
             self._pgf_path_draw(stroke=True)
             _writeln(self.fh, r"\end{pgfscope}")
diff --git a/lib/matplotlib/tests/baseline_images/test_backend_pgf/hatch_linewidth.pdf b/lib/matplotlib/tests/baseline_images/test_backend_pgf/hatch_linewidth.pdf
diff --git a/lib/matplotlib/tests/test_backend_pgf.py b/lib/matplotlib/tests/test_backend_pgf.py
@@ -11,7 +11,8 @@
 import matplotlib.pyplot as plt
 from matplotlib.testing import _has_tex_package, _check_for_pgf
 from matplotlib.testing.compare import compare_images, ImageComparisonFailure
-from matplotlib.backends.backend_pgf import PdfPages, _tex_escape
+from matplotlib.backends.backend_pgf import (
+    FigureCanvasPgf, PdfPages, _tex_escape)
 from matplotlib.testing.decorators import (
     _image_directories, check_figures_equal, image_comparison)
 from matplotlib.testing._markers import (
@@ -365,3 +366,13 @@ def test_sketch_params():
     # \pgfdecoratecurrentpath must be after the path definition and before the
     # path is used (\pgfusepath)
     assert baseline in buf
+
+
+@needs_pgf_xelatex
+@pytest.mark.backend('pgf')
+@image_comparison(['hatch_linewidth'], extensions=['pdf'])
+def test_pgf_hatch_linewidth():
+    mpl.backend_bases.register_backend('pdf', FigureCanvasPgf)
+    mpl.rcParams['hatch.linewidth'] = 0.1
+
+    plt.bar(1, 1, color='white', edgecolor='black', hatch='/')
