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 // Created on: 1993-08-25
 // Created by: Bruno DUMORTIER
 // Copyright (c) 1993-1999 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 _ProjLib_ProjectedCurve_HeaderFile
 #define _ProjLib_ProjectedCurve_HeaderFile
 
 #include <Adaptor2d_Curve2d.hxx>
 #include <Adaptor3d_Surface.hxx>
 #include <AppParCurves_Constraint.hxx>
 #include <GeomAbs_CurveType.hxx>
 #include <GeomAbs_Shape.hxx>
 #include <ProjLib_Projector.hxx>
 #include <TColStd_Array1OfReal.hxx>
 
 class gp_Pnt2d;
 class gp_Vec2d;
 class gp_Lin2d;
 class gp_Circ2d;
 class gp_Elips2d;
 class gp_Hypr2d;
 class gp_Parab2d;
 class Geom2d_BezierCurve;
 class Geom2d_BSplineCurve;
 
 DEFINE_STANDARD_HANDLE(ProjLib_ProjectedCurve, Adaptor2d_Curve2d)
 
 //! Compute the 2d-curve.  Try to solve the particular
 //! case if possible.  Otherwise, an approximation  is
 //! done. For approximation some parameters are used, including
 //! required tolerance of approximation.
 //! Tolerance is maximal possible value of 3d deviation of 3d projection of projected curve from
 //! "exact" 3d projection. Since algorithm searches 2d curve on surface, required 2d tolerance is
 //! computed from 3d tolerance with help of U,V resolutions of surface. 3d and 2d tolerances have
 //! sense only for curves on surface, it defines precision of projecting and approximation and have
 //! nothing to do with distance between the projected curve and the surface.
 class ProjLib_ProjectedCurve : public Adaptor2d_Curve2d
 {
   DEFINE_STANDARD_RTTIEXT(ProjLib_ProjectedCurve, Adaptor2d_Curve2d)
 public:
   //! Empty constructor, it only sets some initial values for class fields.
   Standard_EXPORT ProjLib_ProjectedCurve();
 
   //! Constructor with initialisation field mySurface
   Standard_EXPORT ProjLib_ProjectedCurve(const Handle(Adaptor3d_Surface)& S);
 
   //! Constructor, which performs projecting.
   //! If projecting uses approximation, default parameters are used, in particular, 3d tolerance of
   //! approximation is Precision::Confusion()
   Standard_EXPORT ProjLib_ProjectedCurve(const Handle(Adaptor3d_Surface)& S,
                                          const Handle(Adaptor3d_Curve)&   C);
 
   //! Constructor, which performs projecting.
   //! If projecting uses approximation, 3d tolerance is Tol, default parameters are used,
   Standard_EXPORT ProjLib_ProjectedCurve(const Handle(Adaptor3d_Surface)& S,
                                          const Handle(Adaptor3d_Curve)&   C,
                                          const Standard_Real              Tol);
 
   //! Shallow copy of adaptor
   Standard_EXPORT virtual Handle(Adaptor2d_Curve2d) ShallowCopy() const Standard_OVERRIDE;
 
   //! Changes the tolerance used to project
   //! the curve on the surface
   Standard_EXPORT void Load(const Standard_Real Tolerance);
 
   //! Changes the Surface.
   Standard_EXPORT void Load(const Handle(Adaptor3d_Surface)& S);
 
   //! Performs projecting for given curve.
   //! If projecting uses approximation,
   //! approximation parameters can be set before by corresponding methods
   //! SetDegree(...), SetMaxSegmets(...), SetBndPnt(...), SetMaxDist(...)
   Standard_EXPORT void Perform(const Handle(Adaptor3d_Curve)& C);
 
   //! Set min and max possible degree of result BSpline curve2d, which is got by approximation.
   //! If theDegMin/Max < 0, algorithm uses values that are chosen depending of types curve 3d
   //! and surface.
   Standard_EXPORT void SetDegree(const Standard_Integer theDegMin,
                                  const Standard_Integer theDegMax);
 
   //! Set the parameter, which defines maximal value of parametric intervals the projected
   //! curve can be cut for approximation. If theMaxSegments < 0, algorithm uses default
   //! value = 1000.
   Standard_EXPORT void SetMaxSegments(const Standard_Integer theMaxSegments);
 
   //! Set the parameter, which defines type of boundary condition between segments during
   //! approximation. It can be AppParCurves_PassPoint or AppParCurves_TangencyPoint. Default value
   //! is AppParCurves_TangencyPoint;
   Standard_EXPORT void SetBndPnt(const AppParCurves_Constraint theBndPnt);
 
   //! Set the parameter, which degines maximal possible distance between projected curve and
   //! surface. It uses only for projecting on not analytical surfaces. If theMaxDist < 0, algorithm
   //! uses default value 100.*Tolerance. If real distance between curve and surface more then
   //! theMaxDist, algorithm stops working.
   Standard_EXPORT void SetMaxDist(const Standard_Real theMaxDist);
 
   Standard_EXPORT const Handle(Adaptor3d_Surface)& GetSurface() const;
 
   Standard_EXPORT const Handle(Adaptor3d_Curve)& GetCurve() const;
 
   //! returns the tolerance reached if an approximation
   //! is Done.
   Standard_EXPORT Standard_Real GetTolerance() const;
 
   Standard_EXPORT Standard_Real FirstParameter() const Standard_OVERRIDE;
 
   Standard_EXPORT Standard_Real LastParameter() const Standard_OVERRIDE;
 
   Standard_EXPORT GeomAbs_Shape Continuity() const Standard_OVERRIDE;
 
   //! If necessary,  breaks the  curve in  intervals  of
   //! continuity  <S>.    And  returns   the number   of
   //! intervals.
   Standard_EXPORT Standard_Integer NbIntervals(const GeomAbs_Shape S) const Standard_OVERRIDE;
 
   //! Stores in <T> the  parameters bounding the intervals
   //! of continuity <S>.
   //!
   //! The array must provide enough room to accommodate
   //! for the parameters. i.e. T.Length() > NbIntervals()
   Standard_EXPORT void Intervals(TColStd_Array1OfReal& T,
                                  const GeomAbs_Shape   S) const Standard_OVERRIDE;
 
   //! Returns    a  curve equivalent   of  <me>  between
   //! parameters <First>  and <Last>. <Tol>  is used  to
   //! test for 3d points confusion.
   //! If <First> >= <Last>
   Standard_EXPORT Handle(Adaptor2d_Curve2d) Trim(const Standard_Real First,
                                                  const Standard_Real Last,
                                                  const Standard_Real Tol) const Standard_OVERRIDE;
 
   Standard_EXPORT Standard_Boolean IsClosed() const Standard_OVERRIDE;
 
   Standard_EXPORT Standard_Boolean IsPeriodic() const Standard_OVERRIDE;
 
   Standard_EXPORT Standard_Real Period() const Standard_OVERRIDE;
 
   //! Computes the point of parameter U on the curve.
   Standard_EXPORT gp_Pnt2d Value(const Standard_Real U) const Standard_OVERRIDE;
 
   //! Computes the point of parameter U on the curve.
   Standard_EXPORT void D0(const Standard_Real U, gp_Pnt2d& P) const Standard_OVERRIDE;
 
   //! Computes the point of parameter U on the curve with its
   //! first derivative.
   //! Raised if the continuity of the current interval
   //! is not C1.
   Standard_EXPORT void D1(const Standard_Real U, gp_Pnt2d& P, gp_Vec2d& V) const Standard_OVERRIDE;
 
   //! Returns the point P of parameter U, the first and second
   //! derivatives V1 and V2.
   //! Raised if the continuity of the current interval
   //! is not C2.
   Standard_EXPORT void D2(const Standard_Real U,
                           gp_Pnt2d&           P,
                           gp_Vec2d&           V1,
                           gp_Vec2d&           V2) const Standard_OVERRIDE;
 
   //! Returns the point P of parameter U, the first, the second
   //! and the third derivative.
   //! Raised if the continuity of the current interval
   //! is not C3.
   Standard_EXPORT void D3(const Standard_Real U,
                           gp_Pnt2d&           P,
                           gp_Vec2d&           V1,
                           gp_Vec2d&           V2,
                           gp_Vec2d&           V3) const Standard_OVERRIDE;
 
   //! The returned vector gives the value of the derivative for the
   //! order of derivation N.
   //! Raised if the continuity of the current interval
   //! is not CN.
   //! Raised if N < 1.
   Standard_EXPORT gp_Vec2d DN(const Standard_Real    U,
                               const Standard_Integer N) const Standard_OVERRIDE;
 
   //! Returns the parametric  resolution corresponding
   //! to the real space resolution <R3d>.
   Standard_EXPORT Standard_Real Resolution(const Standard_Real R3d) const Standard_OVERRIDE;
 
   //! Returns  the  type of the   curve  in the  current
   //! interval :   Line,   Circle,   Ellipse, Hyperbola,
   //! Parabola, BezierCurve, BSplineCurve, OtherCurve.
   Standard_EXPORT GeomAbs_CurveType GetType() const Standard_OVERRIDE;
 
   Standard_EXPORT gp_Lin2d Line() const Standard_OVERRIDE;
 
   Standard_EXPORT gp_Circ2d Circle() const Standard_OVERRIDE;
 
   Standard_EXPORT gp_Elips2d Ellipse() const Standard_OVERRIDE;
 
   Standard_EXPORT gp_Hypr2d Hyperbola() const Standard_OVERRIDE;
 
   Standard_EXPORT gp_Parab2d Parabola() const Standard_OVERRIDE;
 
   Standard_EXPORT Standard_Integer Degree() const Standard_OVERRIDE;
 
   Standard_EXPORT Standard_Boolean IsRational() const Standard_OVERRIDE;
 
   Standard_EXPORT Standard_Integer NbPoles() const Standard_OVERRIDE;
 
   Standard_EXPORT Standard_Integer NbKnots() const Standard_OVERRIDE;
 
   //! Warning ! This will  NOT make a copy  of the -- Bezier Curve -
   //! If you want to modify -- the Curve  please make a copy
   //! yourself --  Also it will  NOT trim the surface  to --
   //! myFirst/Last.
   Standard_EXPORT Handle(Geom2d_BezierCurve) Bezier() const Standard_OVERRIDE;
 
   //! Warning ! This will NOT make a copy of the BSpline Curve - If
   //! you want to  modify the   Curve  please make a   copy
   //! yourself Also it   will  NOT  trim   the surface   to
   //! myFirst/Last.
   Standard_EXPORT Handle(Geom2d_BSplineCurve) BSpline() const Standard_OVERRIDE;
 
 private:
   Standard_Real             myTolerance;
   Handle(Adaptor3d_Surface) mySurface;
   Handle(Adaptor3d_Curve)   myCurve;
   ProjLib_Projector         myResult;
   Standard_Integer          myDegMin;
   Standard_Integer          myDegMax;
   Standard_Integer          myMaxSegments;
   Standard_Real             myMaxDist;
   AppParCurves_Constraint   myBndPnt;
 };
 
 #endif // _ProjLib_ProjectedCurve_HeaderFile

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