Allow creating empty closed paths

timhoffm · timhoffm · commit 425823e7417e · 2018-05-06T01:11:25.000+02:00
diff --git a/lib/matplotlib/path.py b/lib/matplotlib/path.py
@@ -137,7 +137,7 @@ def __init__(self, vertices, codes=None, _interpolation_steps=1,
             if len(codes) and codes[0] != self.MOVETO:
                 raise ValueError("The first element of 'code' must be equal "
                                  "to 'MOVETO' ({})".format(self.MOVETO))
-        elif closed:
+        elif closed and len(vertices):
             codes = np.empty(len(vertices), dtype=self.code_type)
             codes[0] = self.MOVETO
             codes[1:-1] = self.LINETO
diff --git a/lib/matplotlib/tests/test_path.py b/lib/matplotlib/tests/test_path.py
@@ -12,6 +12,12 @@
 from matplotlib import transforms
 
 
+def test_empty_closed_path():
+    path = Path(np.zeros((0, 2)), closed=True)
+    assert path.vertices.shape == (0, 2)
+    assert path.codes is None
+
+
 def test_readonly_path():
     path = Path.unit_circle()
 
