.. role:: blue
   :class: blue

Curve Extension
===============
.. _Curve_Extension_:

.. версия ядра: 118050

The function

.. code-block:: cpp

   MbResultType ExtendCurve( const MbCurve3D &                    sourceCurve,
                             const MbCurveExtensionParameters3D & parameters,
                                   SPtr<MbWireFrame> &            resFrame );

extends the given curve in accordance with the specified parameters.

The function parameters are:

- **sourceCurve** - the source (extendable) curve;
- **parameters** - the extension parameters (for the definition of the :blue:`MbCurveExtensionParameters3D` class and its constructors, see *op_curve_parameter.h*);
- **resFrame** - the operation result. It is a wireframe, covering the source curve completely. Additionally, it includes an “extending segment”. The wireframe contains the :blue:`MbExtendCurveCreator` creator declared in the *cr_extending_curve.h* file.

The function is declared in the *action_curve3d.h* file.

In the test application test.exe, curve extension is performed via the menu command “Modify→Curve in space→Extend”.

It is recommended to wrap the original curve in a wireframe and call the :blue:`ExtendWireFrame`\() function, detailed in subsection :ref:`Wireframe Extension <Wireframe_Extension_>`.