HDF5TomoScan: swap dim_1 and dim_2

tomoscan/esrf/hdf5scan.py

@@ -435,18 +435,14 @@ class HDF5TomoScan(TomoScanBase):
 
     @property
     def dim_1(self) -> typing.Union[None, int]:
-        if self._dim_1 is None and self.master_file and os.path.exists(self.master_file):
-            if self.projections is not None:
-                if len(self.projections) > 0:
-                    self._dim_1, self._dim_2 = get_data(list(self.projections.values())[0]).shape
+        if self._dim_1 is None:
+            self._get_dim1_dim2()
         return self._dim_1
 
     @property
     def dim_2(self) -> typing.Union[None, int]:
-        if self._dim_2 is None and self.master_file and os.path.exists(self.master_file):
-            if self.projections is not None:
-                if len(self.projections) > 0:
-                    self._dim_1, self._dim_2 = get_data(list(self.projections.values())[0]).shape
+        if self._dim_2 is None:
+            self._get_dim1_dim2()
         return self._dim_2
 
     @property
@@ -470,6 +466,12 @@ class HDF5TomoScan(TomoScanBase):
             _y_pixel_size = self._get_value(y_pixel_dataset, default_unit='mm')
         return _x_pixel_size, _y_pixel_size
 
+    def _get_dim1_dim2(self):
+        if self.master_file and os.path.exists(self.master_file):
+            if self.projections is not None:
+                if len(self.projections) > 0:
+                    self._dim_2, self._dim_1 = get_data(list(self.projections.values())[0]).shape
+
     @property
     def y_pixel_size(self) -> typing.Union[None, float]:
         if (self._y_pixel_size is None and self.master_file and