src/sage/geometry/polyhedral_complex.py: Change to a centrally symmetric example

Author: Matthias Koeppe

src/sage/geometry/polyhedral_complex.py

@@ -737,8 +737,8 @@ def plot(self, **kwds):
             sage: p1 = Polyhedron(vertices=[(1, 1), (0, 0), (1, 2)])
             sage: p2 = Polyhedron(vertices=[(1, 2), (0, 0), (0, 2)])
             sage: p3 = Polyhedron(vertices=[(0, 0), (0, 2), (-1, 1)])
-            sage: pc = PolyhedralComplex([p1, p2, p3])
-            sage: bb = dict(xmin=-2, xmax=2, ymin=-0.5, ymax=3, axes=False)
+            sage: pc = PolyhedralComplex([p1, p2, p3, -p1, -p2, -p3])
+            sage: bb = dict(xmin=-2, xmax=2, ymin=-3, ymax=3, axes=False)
             sage: g0 = pc.plot(**bb)                                         # optional - sage.plot
             sage: g1 = pc.plot(explosion_factor=0.3, **bb)                   # optional - sage.plot
             sage: g2 = pc.plot(explosion_factor=1, **bb)                     # optional - sage.plot