fix nurbs copy by using data

Author: tomvanmele

src/compas_occ/geometry/curves/nurbs.py

@@ -1,4 +1,5 @@
 from math import sqrt
+from copy import deepcopy
 
 from compas.geometry import Point
 from compas.geometry import Vector
@@ -437,6 +438,17 @@ def from_line(cls, line):
     # Methods
     # ==============================================================================
 
+    def copy(self):
+        """Make an independent copy of the current curve.
+
+        Returns
+        -------
+        :class:`compas_occ.geometry.OCCCurve`
+
+        """
+        cls = type(self)
+        return cls.from_data(deepcopy(self.data))
+
     def segment(self, u, v, precision=1e-3):
         """Modifies this curve by segmenting it between the parameters u and v.