From 11b5e18fe36e34e128ba80cafbd085088bfde35a Mon Sep 17 00:00:00 2001
From: Ryan May <rmay31@gmail.com>
Date: Tue, 21 Jul 2020 11:46:00 -0600
Subject: [PATCH] Backport PR #17994: Special case degree-1 Bezier curves.

---
 lib/matplotlib/bezier.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/matplotlib/bezier.py b/lib/matplotlib/bezier.py
index f2960cfcd25e..b36e2c1aef0a 100644
--- a/lib/matplotlib/bezier.py
+++ b/lib/matplotlib/bezier.py
@@ -288,10 +288,10 @@ def axis_aligned_extrema(self):
             0`
         """
         n = self.degree
+        if n <= 1:
+            return np.array([]), np.array([])
         Cj = self.polynomial_coefficients
         dCj = np.arange(1, n+1)[:, None] * Cj[1:]
-        if len(dCj) == 0:
-            return np.array([]), np.array([])
         dims = []
         roots = []
         for i, pi in enumerate(dCj.T):