0024428: Implementation of LGPL license

[occt.git] / src / Convert / Convert_ParabolaToBSplineCurve.cdl

-- Created on: 1991-10-10
-- Created by: Jean Claude VAUTHIER
-- Copyright (c) 1991-1999 Matra Datavision
-- Copyright (c) 1999-2014 OPEN CASCADE SAS
--
-- This file is part of Open CASCADE Technology software library.
--
-- This library is free software; you can redistribute it and / or modify it
-- under the terms of the GNU Lesser General Public version 2.1 as published
-- by the Free Software Foundation, with special exception defined in the file
-- OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
-- distribution for complete text of the license and disclaimer of any warranty.
--
-- Alternatively, this file may be used under the terms of Open CASCADE
-- commercial license or contractual agreement.

class ParabolaToBSplineCurve   from Convert   inherits ConicToBSplineCurve

        --- Purpose :
        --  This algorithm converts a parabola into a non rational B-spline
        --  curve.
        --  The parabola is a Parab2d from package gp with the parametrization
        --  P (U) = Loc + F * (U*U * Xdir + 2 * U * Ydir) where Loc is the 
        --  apex of the parabola, Xdir is the normalized direction of the 
        --  symmetry axis of the parabola, Ydir is the normalized direction of
        --  the directrix and F is the focal length.
        --- KeyWords :
        --  Convert, Parabola, BSplineCurve, 2D .

uses Parab2d from gp

is


  Create (Prb : Parab2d; U1, U2 : Real)   returns ParabolaToBSplineCurve;
        --- Purpose : 
        --  The parabola Prb is limited between the parametric values U1, U2
        --  and the equivalent B-spline curve as the same orientation as the
        --  parabola Prb.


end ParabolaToBSplineCurve;