Gridedit 2044 expose illegal cells polygons

meshkernel/meshkernel.py

@@ -282,6 +282,39 @@ def mesh2d_delete(
             c_int(invert_deletion),
         )
 
+    def mesh2d_get_mesh_inner_boundaries_as_polygons(self) -> GeometryList:
+        """Gets the inner boundary polygons from the MeshKernel.
+
+        Returns:
+            Mesh2d: A copy of the inner boundary polygons.
+        """
+
+        c_geometry_list_dimension = c_int()
+
+        self._execute_function(
+            self.lib.mkernel_mesh2d_get_mesh_inner_boundaries_as_polygons_dimension,
+            self._meshkernelid,
+            byref(c_geometry_list_dimension),
+        )
+
+        n_coordinates = c_geometry_list_dimension.value
+        x_coordinates = np.empty(n_coordinates, dtype=np.double)
+        y_coordinates = np.empty(n_coordinates, dtype=np.double)
+
+        face_polygons = GeometryList(
+            x_coordinates=x_coordinates, y_coordinates=y_coordinates
+        )
+
+        c_face_polygons = CGeometryList.from_geometrylist(face_polygons)
+
+        self._execute_function(
+            self.lib.mkernel_mesh2d_get_mesh_inner_boundaries_as_polygons_data,
+            self._meshkernelid,
+            byref(c_face_polygons),
+        )
+
+        return face_polygons
+
     def mesh2d_delete_faces_in_polygons(
         self,
         geometry_list: GeometryList,

tests/test_mesh2d_basics.py

@@ -142,6 +142,9 @@ def test_mesh2d_set_and_mesh2d_get_with_holes():
     assert len(mk.mesh2d_get().face_x) == 318
     assert len(mk2.mesh2d_get().face_x) == 318
 
+    innerPolygon = mk2.mesh2d_get_mesh_inner_boundaries_as_polygons()
+    assert innerPolygon.x_coordinates.size == 7
+
 
 def test_mesh2d_add():
     """Test adding a 2d mesh"""