use shallow copy instead of deepcopy (#18)

.github/workflows/python_package.yaml

@@ -1,6 +1,11 @@
 name: CI
 
-on: [push]
+on:
+  push:
+    branches: [master, ]
+  pull_request:
+    # The branches below must be a subset of the branches above
+    branches: [master]
 
 jobs:
   pytest:

aabbtree.py

@@ -1,6 +1,5 @@
 """Class definitions and methods for the AABB and AABBTree."""
 
-import copy
 from collections import deque
 
 __all__ = ['AABB', 'AABBTree']
@@ -404,7 +403,7 @@ def add(self, aabb, value=None, method='volume'):
             self.value = value
 
         elif self.is_leaf:
-            self.left = copy.deepcopy(self)
+            self.left = AABBTree(self.aabb, value=self.value, left=self.left, right=self.right)
             self.right = AABBTree(aabb, value)
 
             self.aabb = AABB.merge(self.aabb, aabb)
@@ -438,7 +437,7 @@ def add(self, aabb, value=None, method='volume'):
                 raise ValueError('Unrecognized method: ' + str(method))
 
             if branch_cost < left_cost and branch_cost < right_cost:
-                self.left = copy.deepcopy(self)
+                self.left = AABBTree(self.aabb, value=self.value, left=self.left, right=self.right)
                 self.right = AABBTree(aabb, value)
                 self.value = None
             elif left_cost < right_cost:

setup.py

@@ -15,7 +15,7 @@ def read(fname):
 
 setup(
     name='aabbtree',
-    version='2.8.0',
+    version='2.8.1',
     license='MIT',
     description='Pure Python implementation of d-dimensional AABB tree.',
     long_description=read('README.rst'),

tests/test_aabbtree.py

@@ -257,6 +257,20 @@ def test_overlap_values_error():
         tree.overlap_values(aabbs[0], method=method)
 
 
+def test_return_the_origin_pass_in_value():
+    class Foo:
+        pass
+
+    tree = AABBTree()
+    value_set = {Foo() for _ in range(10)}
+
+    for value in value_set:
+        tree.add(AABB([(0, 1), (0, 1)]), value=value)
+
+    retrieved_value_set = set(tree.overlap_values(AABB([(0, 2), (0, 2)]), unique=False))
+    assert retrieved_value_set == value_set
+
+
 def test_depth():
     assert AABBTree().depth == 0
     assert standard_tree().depth == 2