.. role:: code
   :class: code

MbPointCurve Two-Dimensional Curve-Point
========================================
.. _MbPointCurve_Two-Dimensional_Curve-Point_:

.. kernel version: 118064

The :code:`MbPointCurve` class is declared in the *cur_point_curve.h* file.

A two-dimensional point curve is defined by a point
:ref:`MbCartPoint <MbCartPoint_Point_Radius_Vector_in_Two-Dimensional_Space_>` **point**, the minimum curve parameter
**tmin**, the maximum curve parameter **tmax**, and the curve closedness flag **closed**.

In the method

.. code-block:: cpp

   PointOn( double & t, MbCartPoint & r)

the radius vector of the curve **r** is described by the vector function **r**\(*t*\) = **point**.

The curve parameter **t** takes values on the interval
**tmin** ≤ **t** ≤ **tmax**. The curve can be periodic. The following inequality must hold for the parameters:
**tmin** < **tmax**.

A two-dimensional point curve is used together with another two-dimensional curve to
describe the intersection of surfaces, one of which has a singular point,
for example, a pole. The parameters **tmin**, **tmax**, **closed** of the point curve correspond to the parameters of the two-dimensional curve used together with the point curve.