re-instate get_array_slice_dimensions in Python interface (#1464)

python/simulation.py

@@ -3299,6 +3299,28 @@ def get_array_metadata(self, vol=None, center=None, size=None, dft_cell=None,
             return points,weights
         return tuple(tics) + (weights,)
 
+    def get_array_slice_dimensions(self, component, vol=None, center=None, size=None):
+        """
+        Computes the dimensions of an array slice for a particular `component` (`mp.Ez`, `mp.Ey`, etc.).
+
+        Accepts either a volume object (`vol`), or a `center` and `size` `Vector3` pair.
+
+        Returns a tuple containing the dimensions (`dim_sizes`), a `Vector3` object
+        corresponding to the minimum corner of the volume (`min_corner`),
+        and a `Vector3` object corresponding to the maximum corner (`max_corner`).
+        """
+        if vol is None and center is None and size is None:
+            v = self.fields.total_volume()
+        else:
+            v = self._volume_from_kwargs(vol, center, size)
+        dim_sizes = np.zeros(3, dtype=np.uintp)
+        corners = []
+        _,_ = mp._get_array_slice_dimensions(self.fields, v, dim_sizes, False, False, component, corners)
+        dim_sizes[dim_sizes==0] = 1
+        min_corner = corners[0]
+        max_corner = corners[1]
+        return dim_sizes, min_corner, max_corner
+
     def get_eigenmode_coefficients(self, flux, bands, eig_parity=mp.NO_PARITY, eig_vol=None,
                                    eig_resolution=0, eig_tolerance=1e-12, kpoint_func=None, direction=mp.AUTOMATIC):
         """