Merge pull request #23275 from meeseeksmachine/auto-backport-of-pr-23260-on-v3.5.x

timhoffm · web-flow · commit ad1d91d6c17d · 2022-06-21T21:51:30.000+02:00
Backport PR #23260 on branch v3.5.x (Fix Colorbar extend patches to have correct alpha)
diff --git a/lib/matplotlib/colorbar.py b/lib/matplotlib/colorbar.py
@@ -707,8 +707,9 @@ def _do_extends(self, ax=None):
             val = -1 if self._long_axis().get_inverted() else 0
             color = self.cmap(self.norm(self._values[val]))
             patch = mpatches.PathPatch(
-                mpath.Path(xy), facecolor=color, linewidth=0,
-                antialiased=False, transform=self.ax.transAxes,
+                mpath.Path(xy), facecolor=color, alpha=self.alpha,
+                linewidth=0, antialiased=False,
+                transform=self.ax.transAxes,
                 hatch=hatches[0], clip_on=False,
                 # Place it right behind the standard patches, which is
                 # needed if we updated the extends
@@ -728,7 +729,7 @@ def _do_extends(self, ax=None):
             val = 0 if self._long_axis().get_inverted() else -1
             color = self.cmap(self.norm(self._values[val]))
             patch = mpatches.PathPatch(
-                mpath.Path(xy), facecolor=color,
+                mpath.Path(xy), facecolor=color, alpha=self.alpha,
                 linewidth=0, antialiased=False,
                 transform=self.ax.transAxes, hatch=hatches[-1], clip_on=False,
                 # Place it right behind the standard patches, which is
