def tangentAt(self, locationVector=None):
"""
Compute tangent vector at the specified location.
:param locationVector: location to use. Use the center point if None
:return: tangent vector
"""
curve = self._geomAdaptor()
if locationVector:
raise NotImplementedError
else:
umin, umax = curve.FirstParameter(), curve.LastParameter()
umid = 0.5 * (umin + umax)
# TODO what are good parameters for those?
curve_props = BRepLProp_CLProps(curve, 2, curve.Tolerance())
curve_props.SetParameter(umid)
if curve_props.IsTangentDefined():
dir_handle = gp_Dir(
) # this is awkward due to C++ pass by ref in the API
curve_props.Tangent(dir_handle)
return Vector(dir_handle)
def __init__(self, instance):
self.instance = instance
self._local_props = BRepLProp_CLProps(self.instance.adaptor, 2,
self.instance.tolerance)
def __init__(self, instance):
self.instance = instance
from OCC.BRepLProp import BRepLProp_CLProps
# initialize with random parameter: 0
self._curvature = BRepLProp_CLProps(self.instance.adaptor, 0, 2, self.instance.tolerance)