FIX

jklymak · jklymak · commit ebe0688a3ef0 · 2020-10-09T16:10:32.000-07:00
diff --git a/lib/matplotlib/_constrained_layout.py b/lib/matplotlib/_constrained_layout.py
@@ -277,31 +277,34 @@ def _make_layout_margins(fig, renderer, *, w_pad=0, h_pad=0,
 def _make_margin_suptitles(fig, renderer, *, w_pad=0, h_pad=0):
     # Figure out how large the suptitle is and make the
     # top level figure margin larger.
-    
+
     invTransFig = fig.transFigure.inverted().transform_bbox
-    padboxF = mtransforms.Bbox([[0, 0], [w_pad, h_pad]])
-    padboxLocal = (fig.transFigure - fig.transSubfigure).transform_bbox(padboxF)
-    h_padLocal = padboxLocal.height
-    w_padLocal = padboxLocal.width
+    # get the h_pad and w_pad as distances in the local subfigure coordinates:
+    padbox = mtransforms.Bbox([[0, 0], [w_pad, h_pad]])
+    padbox = (fig.transFigure -
+                   fig.transSubfigure).transform_bbox(padbox)
+    h_pad_local = padbox.height
+    w_pad_local = padbox.width
 
     for panel in fig.subfigs:
         _make_margin_suptitles(panel, renderer, w_pad=w_pad, h_pad=h_pad)
 
     if fig._suptitle is not None and fig._suptitle.get_in_layout():
         p = fig._suptitle.get_position()
-        fig._suptitle.set_position((p[0], 1 - h_padLocal))
-        bbox = invTransFig(fig._suptitle.get_tightbbox(renderer)) # fig coords
+        fig._suptitle.set_position((p[0], 1 - h_pad_local))
+        bbox = invTransFig(fig._suptitle.get_tightbbox(renderer))  # fig coords
         fig._layoutgrid.edit_margin_min('top', bbox.height + 2.0 * h_pad)
 
     if fig._supxlabel is not None and fig._supxlabel.get_in_layout():
         p = fig._supxlabel.get_position()
-        fig._supxlabel.set_position((p[0], h_padLocal))
+        fig._supxlabel.set_position((p[0], h_pad_local))
+        bbox = invTransFig(fig._supxlabel.get_tightbbox(renderer))  # fig coord
         fig._layoutgrid.edit_margin_min('bottom', bbox.height + 2 * h_pad)
 
     if fig._supylabel is not None and fig._supxlabel.get_in_layout():
         p = fig._supylabel.get_position()
-        fig._supylabel.set_position((w_padLocal, p[1]))
-        bbox = invTransFig(fig._supylabel.get_tightbbox(renderer)) # fig coords
+        fig._supylabel.set_position((w_pad_local, p[1]))
+        bbox = invTransFig(fig._supylabel.get_tightbbox(renderer))  # fig coord
         fig._layoutgrid.edit_margin_min('left', bbox.width + 2 * w_pad)
 
 
