Reuse Grid.__init__ in ImageGrid.__init__.

`ImageGrid.__init__` differs from `Grid.__init__` by some defaults which
can be passed to the superclass, and by additionally constructing the
colorbar axes.  This needs to be pushed into `_update_locators` which
isn't optimal but still better than duplicating the entire
`Grid.__init__`.

lib/mpl_toolkits/axes_grid1/axes_grid.py

@@ -107,9 +107,10 @@ def __init__(self, fig,
                  share_all=False,
                  share_x=True,
                  share_y=True,
-                 #aspect=True,
                  label_mode="L",
                  axes_class=None,
+                 *,
+                 aspect=False,
                  ):
         """
         Parameters
@@ -136,6 +137,7 @@ def __init__(self, fig,
             - "all": all axes are labelled.
 
         axes_class : subclass of `matplotlib.axes.Axes`, default: None
+        aspect : bool, default: False
         """
         self._nrows, self._ncols = nrows_ncols
 
@@ -155,7 +157,7 @@ def __init__(self, fig,
         if axes_class is None:
             axes_class = self._defaultAxesClass
 
-        kw = dict(horizontal=[], vertical=[], aspect=False)
+        kw = dict(horizontal=[], vertical=[], aspect=aspect)
         if isinstance(rect, (str, Number, SubplotSpec)):
             self._divider = SubplotDivider(fig, rect, **kw)
         elif len(rect) == 3:
@@ -401,73 +403,20 @@ def __init__(self, fig,
             to associated *cbar_axes*.
         axes_class : subclass of `matplotlib.axes.Axes`, default: None
         """
-        self._nrows, self._ncols = nrows_ncols
-
-        if ngrids is None:
-            ngrids = self._nrows * self._ncols
-        else:
-            if not 0 < ngrids <= self._nrows * self._ncols:
-                raise Exception
-
-        self.ngrids = ngrids
-
-        self._init_axes_pad(axes_pad)
-
         self._colorbar_mode = cbar_mode
         self._colorbar_location = cbar_location
-        if cbar_pad is None:
-            # horizontal or vertical arrangement?
-            if cbar_location in ("left", "right"):
-                self._colorbar_pad = self._horiz_pad_size.fixed_size
-            else:
-                self._colorbar_pad = self._vert_pad_size.fixed_size
-        else:
-            self._colorbar_pad = cbar_pad
-
+        self._colorbar_pad = cbar_pad
         self._colorbar_size = cbar_size
+        # The colorbar axes are created in _update_locators().
 
-        cbook._check_in_list(["column", "row"], direction=direction)
-        self._direction = direction
-
-        if axes_class is None:
-            axes_class = self._defaultAxesClass
-
-        kw = dict(horizontal=[], vertical=[], aspect=aspect)
-        if isinstance(rect, (str, Number, SubplotSpec)):
-            self._divider = SubplotDivider(fig, rect, **kw)
-        elif len(rect) == 3:
-            self._divider = SubplotDivider(fig, *rect, **kw)
-        elif len(rect) == 4:
-            self._divider = Divider(fig, rect, **kw)
-        else:
-            raise Exception("")
-
-        rect = self._divider.get_position()
-
-        axes_array = np.full((self._nrows, self._ncols), None, dtype=object)
-        for i in range(self.ngrids):
-            col, row = self._get_col_row(i)
-            if share_all:
-                sharex = sharey = axes_array[0, 0]
-            else:
-                sharex = axes_array[0, col]
-                sharey = axes_array[row, 0]
-            axes_array[row, col] = axes_class(
-                fig, rect, sharex=sharex, sharey=sharey)
-        self.axes_all = axes_array.ravel().tolist()
-        self.axes_column = axes_array.T.tolist()
-        self.axes_row = axes_array.tolist()
-        self.axes_llc = self.axes_column[0][-1]
-
-        self.cbar_axes = [
-            self._defaultCbarAxesClass(fig, rect,
-                                       orientation=self._colorbar_location)
-            for _ in range(self.ngrids)]
-
-        self._update_locators()
+        super().__init__(
+            fig, rect, nrows_ncols, ngrids,
+            direction=direction, axes_pad=axes_pad, add_all=add_all,
+            share_all=share_all, share_x=True, share_y=True, aspect=aspect,
+            label_mode=label_mode, axes_class=axes_class)
 
         if add_all:
-            for ax in self.axes_all+self.cbar_axes:
+            for ax in self.cbar_axes:
                 fig.add_axes(ax)
 
         if cbar_set_cax:
@@ -485,9 +434,20 @@ def __init__(self, fig,
                 for ax, cax in zip(self.axes_all, self.cbar_axes):
                     ax.cax = cax
 
-        self.set_label_mode(label_mode)
-
     def _update_locators(self):
+        if self._colorbar_pad is None:
+            # horizontal or vertical arrangement?
+            if self._colorbar_location in ("left", "right"):
+                self._colorbar_pad = self._horiz_pad_size.fixed_size
+            else:
+                self._colorbar_pad = self._vert_pad_size.fixed_size
+        else:
+            self._colorbar_pad = cbar_pad
+        self.cbar_axes = [
+            self._defaultCbarAxesClass(
+                self.axes_all[0].figure, self._divider.get_position(),
+                orientation=self._colorbar_location)
+            for _ in range(self.ngrids)]
 
         h = []
         v = []