Add PathCollection test for ps backend

Author: oscargus

lib/matplotlib/backend_bases.py

@@ -525,6 +525,8 @@ def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
             The font properties.
         angle : float
             The rotation angle in degrees anti-clockwise.
+        ismath : bool or "TeX"
+            If True, use mathtext parser. If "TeX", use *usetex* mode.
         mtext : `matplotlib.text.Text`
             The original text object to be rendered.
 

lib/matplotlib/tests/baseline_images/test_backend_ps/scatter.eps

@@ -4,15 +4,17 @@
 import re
 import tempfile
 
+import numpy as np
 import pytest
 
-from matplotlib import cbook, patheffects, font_manager as fm
+from matplotlib import cbook, path, patheffects, font_manager as fm
 from matplotlib._api import MatplotlibDeprecationWarning
 from matplotlib.figure import Figure
 from matplotlib.patches import Ellipse
 from matplotlib.testing._markers import needs_ghostscript, needs_usetex
 from matplotlib.testing.decorators import check_figures_equal, image_comparison
 import matplotlib as mpl
+import matplotlib.collections as mcollections
 import matplotlib.pyplot as plt
 
 
@@ -298,3 +300,21 @@ def test_multi_font_type42():
 
     fig = plt.figure()
     fig.text(0.15, 0.475, "There are 几个汉字 in between!")
+
+
+@image_comparison(["scatter.eps"])
+def test_path_collection():
+    rng = np.random.default_rng(19680801)
+    xvals = rng.uniform(0, 1, 10)
+    yvals = rng.uniform(0, 1, 10)
+    sizes = rng.uniform(30, 100, 10)
+    fig, ax = plt.subplots()
+    ax.scatter(xvals, yvals, sizes, edgecolor=[0.9, 0.2, 0.1], marker='<')
+    ax.set_axis_off()
+    paths = [path.Path.unit_regular_polygon(i) for i in range(3, 7)]
+    offsets = rng.uniform(0, 200, 20).reshape(10, 2)
+    sizes = [0.02, 0.04]
+    pc = mcollections.PathCollection(paths, sizes, zorder=-1,
+                                     facecolors='yellow', offsets=offsets)
+    ax.add_collection(pc)
+    ax.set_xlim(0, 1)