Fix ps export of colored hatches with no linewidth

oscargus · oscargus · commit 9a11893da5b0 · 2022-04-07T11:54:07.000+02:00
diff --git a/lib/matplotlib/backends/backend_ps.py b/lib/matplotlib/backends/backend_ps.py
@@ -778,6 +778,7 @@ def _draw_ps(self, ps, gc, rgbFace, *, fill=True, stroke=True):
             self.set_linejoin(gc.get_joinstyle())
             self.set_linecap(gc.get_capstyle())
             self.set_linedash(*gc.get_dashes())
+        if mightstroke or hatch:
             self.set_color(*gc.get_rgb()[:3])
         write('gsave\n')
 
diff --git a/lib/matplotlib/tests/baseline_images/test_backend_ps/coloredhatcheszerolw.eps b/lib/matplotlib/tests/baseline_images/test_backend_ps/coloredhatcheszerolw.eps
diff --git a/lib/matplotlib/tests/test_backend_ps.py b/lib/matplotlib/tests/test_backend_ps.py
@@ -9,6 +9,7 @@
 from matplotlib import cbook, patheffects
 from matplotlib._api import MatplotlibDeprecationWarning
 from matplotlib.figure import Figure
+from matplotlib.patches import Ellipse
 from matplotlib.testing.decorators import check_figures_equal, image_comparison
 import matplotlib as mpl
 import matplotlib.pyplot as plt
@@ -192,6 +193,18 @@ def test_type3_font():
     plt.figtext(.5, .5, "I/J")
 
 
+@image_comparison(["coloredhatcheszerolw.eps"])
+def test_colored_hatch_zero_linewidth():
+    ax = plt.gca()
+    ax.add_patch(Ellipse((0, 0), 1, 1, hatch='/', facecolor='none',
+                         edgecolor='r', linewidth=0))
+    ax.add_patch(Ellipse((0.5, 0.5), 0.5, 0.5, hatch='+', facecolor='none',
+                         edgecolor='g', linewidth=0.2))
+    ax.add_patch(Ellipse((1, 1), 0.3, 0.8, hatch='\\', facecolor='none',
+                         edgecolor='b', linewidth=0))
+    ax.set_axis_off()
+
+
 @check_figures_equal(extensions=["eps"])
 def test_text_clip(fig_test, fig_ref):
     ax = fig_test.add_subplot()
