Let connectionpatch be drawn on figure level

ImportanceOfBeingErnest · ImportanceOfBeingErnest · commit 03c88e8a0e36 · 2019-08-10T01:23:28.000+02:00
diff --git a/lib/matplotlib/patches.py b/lib/matplotlib/patches.py
@@ -4454,7 +4454,11 @@ def _check_xy(self, renderer):
         if b or (b is None and self.coords1 == "data"):
             x, y = self.xy1
             xy_pixel = self._get_xy(x, y, self.coords1, self.axesA)
-            if not self.axes.contains_point(xy_pixel):
+            if self.axesA is None:
+                axes = self.axes
+            else:
+                axes = self.axesA
+            if not axes.contains_point(xy_pixel):
                 return False
 
         if b or (b is None and self.coords2 == "data"):
diff --git a/lib/matplotlib/tests/test_patches.py b/lib/matplotlib/tests/test_patches.py
@@ -396,6 +396,18 @@ def test_connection_patch():
     ax2.add_artist(con)
 
 
+def test_connection_patch_fig():
+    # Test that connection patch can be added as figure artist
+    fig, (ax1, ax2) = plt.subplots(1, 2)
+    xy = (0.3, 0.2)
+    con = mpatches.ConnectionPatch(xyA=xy, xyB=xy,
+                                   coordsA="data", coordsB="data",
+                                   axesA=ax1, axesB=ax2,
+                                   arrowstyle="->", shrinkB=5)
+    fig.add_artist(con)
+    fig.canvas.draw()
+
+
 def test_datetime_rectangle():
     # Check that creating a rectangle with timedeltas doesn't fail
     from datetime import datetime, timedelta
