Deprecate superfluous classmethods of Centroids (#721)

* Deprecate superfluous classmethods of Centroids

* Update CHANGELOG.md

* Mention dropping support for non-regular grids

---------

Co-authored-by: Chahan Kropf <chahan.kropf@posteo.com>

CHANGELOG.md

@@ -42,8 +42,12 @@ Removed:
 
 ### Deprecated
 
+- `Centroids.from_geodataframe` and `Centroids.from_pix_bounds` [#721](https://github.com/CLIMADA-project/climada_python/pull/721)
+
 ### Removed
 
+- `Centroids.set_raster_from_pix_bounds` [#721](https://github.com/CLIMADA-project/climada_python/pull/721)
+
 - `requirements/env_developer.yml` environment specs. Use 'extra' requirements when installing the Python package instead [#712](https://github.com/CLIMADA-project/climada_python/pull/712)
 
 ## v3.3.2

climada/hazard/centroids/centr.py

@@ -244,6 +244,10 @@ def from_base_grid(land=False, res_as=360, base_file=None):
     def from_geodataframe(cls, gdf, geometry_alias='geom'):
         """Create Centroids instance from GeoDataFrame.
 
+        .. deprecated:: 3.3
+           This method will be removed in a future version. Pass the data you want to
+           construct the Centroids with to the constructor instead.
+
         The geometry, lat, and lon attributes are set from the GeoDataFrame.geometry attribute,
         while the columns are copied as attributes to the Centroids object in the form of
         numpy.ndarrays using pandas.Series.to_numpy. The Series dtype will thus be respected.
@@ -274,6 +278,11 @@ def from_geodataframe(cls, gdf, geometry_alias='geom'):
         centr : Centroids
             Centroids with data from given GeoDataFrame
         """
+        LOGGER.warning(
+            "Centroids.from_geodataframe has been deprecated and will be removed in a "
+            "future version. Use ther default constructor instead."
+        )
+
         geometry = gdf.geometry
         lat = gdf.geometry.y.to_numpy(copy=True)
         lon = gdf.geometry.x.to_numpy(copy=True)
@@ -293,16 +302,15 @@ def from_geodataframe(cls, gdf, geometry_alias='geom'):
 
         return centroids
 
-    def set_raster_from_pix_bounds(self, *args, **kwargs):
-        """This function is deprecated, use Centroids.from_pix_bounds instead."""
-        LOGGER.warning("The use of Centroids.set_raster_from_pix_bounds is deprecated. "
-                       "Use Centroids.from_pix_bounds instead.")
-        self.__dict__ = Centroids.from_pix_bounds(*args, **kwargs).__dict__
-
     @classmethod
     def from_pix_bounds(cls, xf_lat, xo_lon, d_lat, d_lon, n_lat, n_lon, crs=DEF_CRS):
         """Create Centroids object with meta attribute according to pixel border data.
 
+        .. deprecated:: 3.3
+           This method will be removed in a future version. CLIMADA will only support
+           regular grids with a constant lat/lon resolution then. Use
+           :py:meth:`from_pnt_bounds` instead.
+
         Parameters
         ----------
         xf_lat : float
@@ -325,6 +333,11 @@ def from_pix_bounds(cls, xf_lat, xo_lon, d_lat, d_lon, n_lat, n_lon, crs=DEF_CRS
         centr : Centroids
             Centroids with meta according to given pixel border data.
         """
+        LOGGER.warning(
+            "Centroids.from_pix_bounds has been deprecated and will be removed in a "
+            "future version. Use Centroids.from_pnt_bounds instead."
+        )
+
         meta = {
             'dtype': 'float32',
             'width': n_lon,