// Created on: 1992-09-28
// Created by: Remi GILET
// Copyright (c) 1992-1999 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 License 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.

#ifndef _GCE2d_MakeSegment_HeaderFile
#define _GCE2d_MakeSegment_HeaderFile

#include <Standard.hxx>
#include <Standard_DefineAlloc.hxx>
#include <Standard_Handle.hxx>

#include <GCE2d_Root.hxx>
#include <Geom2d_TrimmedCurve.hxx>

class gp_Pnt2d;
class gp_Dir2d;
class gp_Lin2d;

//! Implements construction algorithms for a line
//! segment in the plane. The result is a
//! Geom2d_TrimmedCurve curve.
//! A MakeSegment object provides a framework for:
//! -   defining the construction of the line segment,
//! -   implementing the construction algorithm, and
//! -   consulting the results. In particular, the Value
//! function returns the constructed line segment.
class GCE2d_MakeSegment : public GCE2d_Root
{
public:
  DEFINE_STANDARD_ALLOC

  //! Make a segment of Line from the 2 points <P1> and <P2>.
  //! Status is "ConfusedPoints" if <P1> and <P2> are confused.
  Standard_EXPORT GCE2d_MakeSegment(const gp_Pnt2d& P1, const gp_Pnt2d& P2);

  //! Make a segment of Line from the point <P1> with
  //! the direction <P> and ended by the projection of
  //! <P2> on the line <P1,V>.
  //! Status is "ConfusedPoints" if <P1> and <P2> are confused.
  Standard_EXPORT GCE2d_MakeSegment(const gp_Pnt2d& P1, const gp_Dir2d& V, const gp_Pnt2d& P2);

  //! Make a segment of Line from the line <Line>
  //! between the two parameters U1 and U2.
  //! Status is "SameParameters" if <U1> is equal <U2>.
  Standard_EXPORT GCE2d_MakeSegment(const gp_Lin2d&     Line,
                                    const Standard_Real U1,
                                    const Standard_Real U2);

  //! Make a segment of Line from the line <Line>
  //! between the point <Point> and the parameter Ulast.
  //! It returns NullObject if <U1> is equal <U2>.
  Standard_EXPORT GCE2d_MakeSegment(const gp_Lin2d&     Line,
                                    const gp_Pnt2d&     Point,
                                    const Standard_Real Ulast);

  //! Make a segment of Line from the line <Line>
  //! between the two points <P1> and <P2>.
  //! It returns NullObject if <P1> and <P2> are confused.
  //! Warning
  //! If the points which limit the segment are coincident
  //! for given points or for the projection of given points
  //! on the line which supports the line segment (that is,
  //! when IsDone returns false), the Status function
  //! returns gce_ConfusedPoints. This warning only
  //! concerns the first two constructors.
  Standard_EXPORT GCE2d_MakeSegment(const gp_Lin2d& Line, const gp_Pnt2d& P1, const gp_Pnt2d& P2);

  //! Returns the constructed line segment.
  //! Exceptions StdFail_NotDone if no line segment is constructed.
  Standard_EXPORT const Handle(Geom2d_TrimmedCurve)& Value() const;

  operator const Handle(Geom2d_TrimmedCurve) & () const { return Value(); }

private:
  Handle(Geom2d_TrimmedCurve) TheSegment;
};

#endif // _GCE2d_MakeSegment_HeaderFile
