From 889252bd34b021d1a0f29a62dc0d0286077a1256 Mon Sep 17 00:00:00 2001
From: Jack Betteridge <43041811+JDBetteridge@users.noreply.github.com>
Date: Thu, 16 May 2024 16:24:07 +0100
Subject: [PATCH] Matplotlib 3.9 changed their API (#3572)

---
 firedrake/pyplot/mpl.py | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/firedrake/pyplot/mpl.py b/firedrake/pyplot/mpl.py
index bd789d5592..984c08f977 100644
--- a/firedrake/pyplot/mpl.py
+++ b/firedrake/pyplot/mpl.py
@@ -162,7 +162,12 @@ def facet_data(typ):
     color_key = "colors" if tdim <= 2 else "facecolors"
     boundary_colors = boundary_kw.pop(color_key, None)
     if boundary_colors is None:
-        cmap = matplotlib.cm.get_cmap("Dark2")
+        # matplotlib.cm.get_cmap was deprecated in Matplotlib 3.9, see:
+        # https://matplotlib.org/3.9.0/api/prev_api_changes/api_changes_3.9.0.html#top-level-cmap-registration-and-access-functions-in-mpl-cm
+        try:
+            cmap = matplotlib.cm.get_cmap("Dark2")
+        except AttributeError:
+            cmap = matplotlib.colormaps["Dark2"]
         num_markers = len(markers)
         colors = cmap([k / num_markers for k in range(num_markers)])
     else: