@@ -66,6 +66,19 @@ def _in_same_row(rownum0min, rownum0max, rownumCmin, rownumCmax):
6666or rownumCmin <= rownum0max <= rownumCmax )
6767
6868
69+ def _axes_all_finite_sized (fig ):
70+ """
71+ helper function to make sure all axes in the
72+ figure have a finite width and height. If not, return False
73+ """
74+ for ax in fig .axes :
75+ if ax ._layoutbox is not None :
76+ newpos = ax ._poslayoutbox .get_rect ()
77+ if newpos [2 ]<= 0 or newpos [3 ]<= 0 :
78+ return False
79+ return True
80+
81+
6982######################################################
7083def do_constrained_layout (fig ,renderer ,h_pad ,w_pad ,
7184hspace = None ,wspace = None ):
@@ -132,6 +145,14 @@ def do_constrained_layout(fig, renderer, h_pad, w_pad,
132145
133146 '''
134147
148+ try :
149+ if fig .canvas .toolbar ._active in ('PAN' ,'ZOOM' ):
150+ # don't do constrained layout during zoom and pan.
151+ return
152+ except AttributeError :
153+ # not toolbar, or no _active attribute..
154+ pass
155+
135156invTransFig = fig .transFigure .inverted ().transform_bbox
136157
137158# list of unique gridspecs that contain child axes:
@@ -187,8 +208,6 @@ def do_constrained_layout(fig, renderer, h_pad, w_pad,
187208figlb = fig ._layoutbox
188209for child in figlb .children :
189210if child ._is_gridspec_layoutbox ():
190- # farm the gridspec layout out.
191- #
192211# This routine makes all the subplot spec containers
193212# have the correct arrangement. It just stacks the
194213# subplot layoutboxes in the correct order...
@@ -199,15 +218,21 @@ def do_constrained_layout(fig, renderer, h_pad, w_pad,
199218
200219fig ._layoutbox .constrained_layout_called += 1
201220fig ._layoutbox .update_variables ()
202- # Now set the position of the axes...
203- for ax in fig .axes :
204- if ax ._layoutbox is not None :
205- newpos = ax ._poslayoutbox .get_rect ()
206- # Now set the new position.
207- # ax.set_position will zero out the layout for
208- # this axis, allowing users to hard-code the position,
209- # so this does the same w/o zeroing layout.
210- ax ._set_position (newpos ,which = 'original' )
221+
222+ # check if any axes collapsed to zero. If not, don't change positions:
223+ if _axes_all_finite_sized (fig ):
224+ # Now set the position of the axes...
225+ for ax in fig .axes :
226+ if ax ._layoutbox is not None :
227+ newpos = ax ._poslayoutbox .get_rect ()
228+ # Now set the new position.
229+ # ax.set_position will zero out the layout for
230+ # this axis, allowing users to hard-code the position,
231+ # so this does the same w/o zeroing layout.
232+ ax ._set_position (newpos ,which = 'original' )
233+ else :
234+ warnings .warn ('constrained_layout not applied. At least '
235+ 'one axes collapsed to zero width or height.' )
211236
212237
213238def _make_ghost_gridspec_slots (fig ,gs ):