improve type annotation

src/ezdxf/acc/vector.pyx

@@ -3,7 +3,7 @@
 # distutils: language = c++
 # Copyright (c) 2020-2023, Manfred Moitzi
 # License: MIT License
-from typing import Iterable, List, Sequence, TYPE_CHECKING, Tuple
+from typing import Iterable, List, Sequence, TYPE_CHECKING, Tuple, Iterator
 from libc.math cimport fabs, sin, cos, M_PI, hypot, atan2, acos, sqrt, fmod
 import random
 
@@ -113,7 +113,7 @@ cdef class Vec2:
         return tuple(Vec2.generate(items))
 
     @staticmethod
-    def generate(items: Iterable[UVec]) -> Iterable[Vec2]:
+    def generate(items: Iterable[UVec]) -> Iterator[Vec2]:
         return (Vec2(item) for item in items)
 
     @staticmethod

src/ezdxf/math/_vector.py

@@ -611,7 +611,7 @@ def tuple(cls, items: Iterable[UVec]) -> Sequence[Vec2]:
         return tuple(cls.generate(items))
 
     @classmethod
-    def generate(cls, items: Iterable[UVec]) -> Iterable[Vec2]:
+    def generate(cls, items: Iterable[UVec]) -> Iterator[Vec2]:
         return (cls(item) for item in items)
 
     @classmethod

src/ezdxf/npshapes.py

@@ -6,6 +6,8 @@
 import abc
 
 import numpy as np
+import numpy.typing as npt
+
 from ezdxf.math import (
     Matrix44,
     Vec2,
@@ -68,7 +70,7 @@ class NumpyShape2d(abc.ABC):
     without sacrificing basic functions like transformation and bounding box calculation.
     """
 
-    _vertices: np.ndarray = EMPTY_SHAPE
+    _vertices: npt.NDArray[VertexNumpyType] = EMPTY_SHAPE
 
     def extents(self) -> tuple[Vec2, Vec2]:
         """Returns the extents of the bounding box as tuple (extmin, extmax)."""
@@ -77,12 +79,12 @@ def extents(self) -> tuple[Vec2, Vec2]:
             return Vec2(v.min(0)), Vec2(v.max(0))
         else:
             raise EmptyShapeError("empty shape has no extends")
-        
+
     @abc.abstractmethod
     def clone(self) -> Self:
         ...
 
-    def np_vertices(self) -> np.ndarray:
+    def np_vertices(self) -> npt.NDArray[VertexNumpyType]:
         return self._vertices
 
     def transform_inplace(self, m: Matrix44) -> None:
@@ -115,6 +117,8 @@ def clone(self) -> Self:
         clone._vertices = self._vertices.copy()
         return clone
 
+    __copy__ = clone
+
     def __len__(self) -> int:
         return len(self._vertices)
 
@@ -137,6 +141,8 @@ class NumpyPath2d(NumpyShape2d):
 
     """
 
+    _commands: npt.NDArray[CommandNumpyType]
+
     def __init__(self, path: Optional[Path]) -> None:
         if path is None:
             self._vertices = EMPTY_SHAPE
@@ -199,7 +205,6 @@ def commands(self) -> Iterator[PathElement]:
                 yield MoveTo(vertices[index])
                 index += 1
 
-
     def to_path(self) -> Path:
         """Returns a new :class:`ezdxf.path.Path` instance."""
         vertices = [Vec3(v) for v in self._vertices]