.. role:: blue
   :class: blue

.. role:: bfit
   :class: bfit

Two-Dimensional Line Segment MbLineSegment
==========================================
.. _MbLineSegment_Two-Dimensional_Straight_Line_Segment_:

.. kernel version: 118061

The :blue:`MbLineSegment` class is declared in the *cur_line_segment.h* file.

The two-dimensional line segment :blue:`MbLineSegment` is defined by the start point
:ref:`MbCartPoint <MbCartPoint_Point_Radius_Vector_in_Two-Dimensional_Space_>` **point1** and the end point
:ref:`MbCartPoint <MbCartPoint_Point_Radius_Vector_in_Two-Dimensional_Space_>` **point2**:

.. figure:: /MODELER/TWO-DIMENSIONAL_CURVES/pictures/O.3.3.1.png
   :width: 12cm
   :align: center

In the :blue:`PointOn`\( double & *t*,
:ref:`MbCartPoint <MbCartPoint_Point_Radius_Vector_in_Two-Dimensional_Space_>` & :bfit:`p`) method the radius vector
of the segment :bfit:`r` is described by the vector function

.. math::

   \mathbf{r}(t) = (1 - t) \cdot \mathbf{point1} + t \cdot \mathbf{point2}

The parameter domain of the segment lies between zero
and one. The parameter *t*\ :subscript:`min` = 0 corresponds to the start point
of the segment **point1**, and the parameter *t*\ :subscript:`max` = 1 corresponds
to the end point of the segment **point2**.