Assert that numpy arg to vec3int has integer values (#434)

* Assert that numpy arg to vec3int has integer values

* Update Changelog.md

Co-authored-by: Jonathan Striebel <[email protected]>

Author: fm3

webknossos/Changelog.md

@@ -12,6 +12,7 @@ For upgrade instructions, please check the respective *Breaking Changes* section
 ### Breaking Changes
 ### Added
 ### Changed
+ - The `Vec3Int` constructor now asserts that its components are whole numbers also in numpy case. [#434](https://github.com/scalableminds/webknossos-libs/pull/434)
 ### Fixed
 
 ## [0.8.16](https://github.com/scalableminds/webknossos-cuber/releases/tag/v0.8.16) - 2021-09-22

webknossos/webknossos/geometry/vec3_int.py

@@ -15,7 +15,7 @@ def __new__(
             return vec
 
         as_tuple: Optional[Tuple[int, int, int]] = None
-        value_error = "Vector components must be three integers or a Vec3IntLike object"
+        value_error = f"Vector components must be three integers or a Vec3IntLike object, got {vec}, {y}, {z}"
 
         if isinstance(vec, int):
             assert y is not None and z is not None, value_error
@@ -24,6 +24,7 @@ def __new__(
         else:
             assert y is None and z is None, value_error
             if isinstance(vec, np.ndarray):
+                assert np.count_nonzero(vec % 1) == 0, value_error
                 assert vec.shape == (
                     3,
                 ), f"Numpy array for Vec3Int must have shape (3,), got {vec.shape}."