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 //! Created on: 2016-06-03
 //! Created by: NIKOLAI BUKHALOV
 //! Copyright (c) 2016 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 _IntPatch_SpecialPoints_HeaderFile
 #define _IntPatch_SpecialPoints_HeaderFile
 
 //! Contains methods to add some special points
 //! (such as apex of cone, pole of sphere,
 //! point on surface boundary etc.) in the intersection line.
 
 #include <Adaptor3d_Surface.hxx>
 #include <IntPatch_SpecPntType.hxx>
 
 class gp_Cone;
 class gp_Vec;
 class gp_XYZ;
 class IntPatch_Point;
 class IntSurf_PntOn2S;
 
 template <typename T>
 class math_VectorBase;
 using math_Vector = math_VectorBase<double>;
 
 class IntPatch_SpecialPoints
 {
 public:
   //! Adds the point defined as intersection
   //! of two isolines (U = 0 and V = 0) on theQSurf in theLine.
   //! theRefPt is used to correct adjusting parameters.
   //! If theIsReversed is TRUE then theQSurf correspond to the
   //! second (otherwise, the first) surface while forming
   //! intersection point IntSurf_PntOn2S.
   Standard_EXPORT static bool AddCrossUVIsoPoint(const occ::handle<Adaptor3d_Surface>& theQSurf,
                                                  const occ::handle<Adaptor3d_Surface>& thePSurf,
                                                  const IntSurf_PntOn2S&                theRefPt,
                                                  const double                          theTol3d,
                                                  IntSurf_PntOn2S& theAddedPoint,
                                                  const bool       theIsReversed = false);
 
   //! Adds the point lain strictly in the isoline U = 0 or V = 0 of theQSurf,
   //! in theLine.
   //! theRefPt is used to correct adjusting parameters.
   //! If theIsReversed is TRUE then theQSurf corresponds to the
   //! second (otherwise, the first) surface while forming
   //! intersection point IntSurf_PntOn2S.
   //! All math_Vector-objects must be filled as follows:
   //!   [1] - U-parameter of thePSurf;
   //!   [2] - V-parameter of thePSurf;
   //!   [3] - U- (if V-isoline is considered) or V-parameter
   //!         (if U-isoline is considered) of theQSurf.
   Standard_EXPORT static bool AddPointOnUorVIso(const occ::handle<Adaptor3d_Surface>& theQSurf,
                                                 const occ::handle<Adaptor3d_Surface>& thePSurf,
                                                 const IntSurf_PntOn2S&                theRefPt,
                                                 const bool                            theIsU,
                                                 const double       theIsoParameter,
                                                 const math_Vector& theToler,
                                                 const math_Vector& theInitPoint,
                                                 const math_Vector& theInfBound,
                                                 const math_Vector& theSupBound,
                                                 IntSurf_PntOn2S&   theAddedPoint,
                                                 const bool         theIsReversed = false);
 
   //! Computes the pole of sphere to add it in the intersection line.
   //! Stores the result in theAddedPoint variable (does not add in the line).
   //! At that, cone and sphere (with singularity) must be set in theQSurf parameter.
   //! By default (if theIsReversed == FALSE), theQSurf is the first surface of the
   //! Walking line. If it is not, theIsReversed parameter must be set to TRUE.
   //! theIsReqRefCheck is TRUE if and only if 3D-point of theRefPt must be pole or apex
   //! for check (e.g. if it is vertex).
   //! thePtIso is the reference point for obtaining isoline where must be placed the Apex/Pole.
   //!
   //! ATTENTION!!!
   //!   theVertex must be initialized before calling the method .
   Standard_EXPORT static bool AddSingularPole(const occ::handle<Adaptor3d_Surface>& theQSurf,
                                               const occ::handle<Adaptor3d_Surface>& thePSurf,
                                               const IntSurf_PntOn2S&                thePtIso,
                                               IntPatch_Point&                       theVertex,
                                               IntSurf_PntOn2S&                      theAddedPoint,
                                               const bool theIsReversed    = false,
                                               const bool theIsReqRefCheck = false);
 
   //! Special point has already been added in the line. Now, we need in correct
   //! prolongation of the line or in start new line. This function returns new point.
   //!
   //! ATTENTION!!!
   //!   theNewPoint is not only Output parameter. It is Input/Output one. I.e.
   //! theNewPoint is reference point together with theRefPt.
   Standard_EXPORT static bool ContinueAfterSpecialPoint(
     const occ::handle<Adaptor3d_Surface>& theQSurf,
     const occ::handle<Adaptor3d_Surface>& thePSurf,
     const IntSurf_PntOn2S&                theRefPt,
     const IntPatch_SpecPntType            theSPType,
     const double                          theTol2D,
     IntSurf_PntOn2S&                      theNewPoint,
     const bool                            theIsReversed = false);
 
   //! Sets theNewPoint parameters in 2D-space the closest to
   //! theRefPoint with help of adding/subtracting corresponding periods.
   //! theArrPeriods must be filled as follows:
   //! {<U-period of 1st surface>, <V-period of 1st surface>,
   //!  <U-period of 2nd surface>, <V-period of 2nd surface>}.
   //! If theVertex != 0 then its parameters will be filled as
   //! corresponding parameters of theNewPoint.
   //!
   //! ATTENTION!!!
   //!   theNewPoint is not only Output parameter. It is Input/Output one. I.e.
   //! theNewPoint is reference point together with theRefPt.
   Standard_EXPORT static void AdjustPointAndVertex(const IntSurf_PntOn2S& theRefPoint,
                                                    const double           theArrPeriods[4],
                                                    IntSurf_PntOn2S&       theNewPoint,
                                                    IntPatch_Point* const  theVertex = nullptr);
 
 protected:
   //! Computes "special point" in the sphere
   //! The parameter will be found in the range [0, 2*PI].
   //! Therefore it must be adjusted to valid range by
   //! the high-level algorithm
   static Standard_EXPORT bool ProcessSphere(const IntSurf_PntOn2S& thePtIso,
                                             const gp_Vec&          theDUofPSurf,
                                             const gp_Vec&          theDVofPSurf,
                                             const bool             theIsReversed,
                                             const double           theVquad,
                                             double&                theUquad,
                                             bool&                  theIsIsoChoosen);
 
   //! Computes "special point" in the cone.
   //! The parameter will be found in the range [0, 2*PI].
   //! Therefore it must be adjusted to valid range by
   //! the high-level algorithm.
   static Standard_EXPORT bool ProcessCone(const IntSurf_PntOn2S& thePtIso,
                                           const gp_Vec&          theDUofPSurf,
                                           const gp_Vec&          theDVofPSurf,
                                           const gp_Cone&         theCone,
                                           const bool             theIsReversed,
                                           double&                theUquad,
                                           bool&                  theIsIsoChoosen);
 
   //! Computes vector tangent to the intersection line in cone apex.
   //! There exist not more than 2 tangent. They will be stores in theResult vector.
   //! Returns the number of found tangents.
   //! thePlnNormal is the normalized vector of the normal to the plane intersected the cone.
   static Standard_EXPORT int GetTangentToIntLineForCone(const double  theConeSemiAngle,
                                                         const gp_XYZ& thePlnNormal,
                                                         gp_XYZ        theResult[2]);
 };
 
 #endif // _IntPatch_AddSpecialPoints_HeaderFile

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