returning a copy of the cached bounding box

heitzmann · Dec 23, 2020 · c4232c6 · c4232c6
1 parent df1657e
commit c4232c6
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/gdspy/library.py b/gdspy/library.py
@@ -578,11 +578,16 @@ def get_bounding_box(self):
                 bb[0, 1] = min(bb[0, 1], all_points[1].min())
                 bb[1, 0] = max(bb[1, 0], all_points[0].max())
                 bb[1, 1] = max(bb[1, 1], all_points[1].max())
-                self._bounding_box = numpy.asarray(bb)
+                self._bounding_box = bb
             else:
                 self._bounding_box = None
             self._bb_valid = True
-        return self._bounding_box
+
+        if self._bounding_box is None:
+            return None
+        else:
+            # return a *copy* of the cached bounding box to ensure it doesn't get inadvertently modified
+            return numpy.array(self._bounding_box)
 
     def get_polygons(self, by_spec=False, depth=None):
         """