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 // Created on: 2014-05-22
 // Created by: Varvara POSKONINA
 // Copyright (c) 2005-2014 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 _SelectMgr_TriangularFrustumSet_HeaderFile
 #define _SelectMgr_TriangularFrustumSet_HeaderFile
 
 #include <SelectMgr_TriangularFrustum.hxx>
 #include <TColgp_HArray1OfPnt2d.hxx>
 
 typedef NCollection_List<Handle(SelectMgr_TriangularFrustum)> SelectMgr_TriangFrustums;
 
 //! This class is used to handle polyline selection. The main principle of polyline selection
 //! algorithm is to split the polygon defined by polyline onto triangles.
 //! Than each of them is considered as a base for triangular frustum building.
 //! In other words, each triangle vertex will be projected from 2d screen space to 3d world space onto near and far view frustum planes.
 //! Thus, the projected triangles make up the bases of selecting frustum.
 //! When the set of such frustums is created, the function determining
 //! selection iterates through triangular frustum set and searches for overlap with any frustum.
 class SelectMgr_TriangularFrustumSet : public SelectMgr_BaseFrustum
 {
 public:
 
   //! Auxiliary structure to define selection polyline
   struct SelectionPolyline
   {
     Handle(TColgp_HArray1OfPnt2d) Points;
   };
 
 public:
 
   //! Constructor.
   SelectMgr_TriangularFrustumSet();
 
   //! Destructor.
   Standard_EXPORT virtual ~SelectMgr_TriangularFrustumSet();
 
   //! Initializes set of triangular frustums by polyline
   Standard_EXPORT void Init (const TColgp_Array1OfPnt2d& thePoints);
 
   //! Meshes polygon bounded by polyline. Than organizes a set of triangular frustums,
   //! where each triangle's projection onto near and far view frustum planes is considered as a frustum base
   //! NOTE: it should be called after Init() method
   Standard_EXPORT virtual void Build() Standard_OVERRIDE;
 
   //! Returns FALSE (not applicable to this volume).
   virtual Standard_Boolean IsScalable() const Standard_OVERRIDE { return false; }
 
   //! Returns a copy of the frustum with all sub-volumes transformed according to the matrix given
   Standard_EXPORT virtual Handle(SelectMgr_BaseIntersector) ScaleAndTransform (const Standard_Integer theScale,
                                                                                const gp_GTrsf& theTrsf,
                                                                                const Handle(SelectMgr_FrustumBuilder)& theBuilder) const Standard_OVERRIDE;
 
 public:
 
   Standard_EXPORT virtual Standard_Boolean OverlapsBox (const SelectMgr_Vec3& theMinPnt,
                                                         const SelectMgr_Vec3& theMaxPnt,
                                                         const SelectMgr_ViewClipRange& theClipRange,
                                                         SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
 
   Standard_EXPORT virtual Standard_Boolean OverlapsBox (const SelectMgr_Vec3& theMinPnt,
                                                         const SelectMgr_Vec3& theMaxPnt,
                                                         Standard_Boolean* theInside) const Standard_OVERRIDE;
 
   Standard_EXPORT virtual Standard_Boolean OverlapsPoint (const gp_Pnt& thePnt,
                                                           const SelectMgr_ViewClipRange& theClipRange,
                                                           SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
 
   //! Always returns FALSE (not applicable to this selector).
   virtual Standard_Boolean OverlapsPoint (const gp_Pnt& ) const Standard_OVERRIDE
   {
     return Standard_False;
   }
 
   Standard_EXPORT virtual Standard_Boolean OverlapsPolygon (const TColgp_Array1OfPnt& theArrayOfPnts,
                                                             Select3D_TypeOfSensitivity theSensType,
                                                             const SelectMgr_ViewClipRange& theClipRange,
                                                             SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
 
   Standard_EXPORT virtual Standard_Boolean OverlapsSegment (const gp_Pnt& thePnt1,
                                                             const gp_Pnt& thePnt2,
                                                             const SelectMgr_ViewClipRange& theClipRange,
                                                             SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
 
   Standard_EXPORT virtual Standard_Boolean OverlapsTriangle (const gp_Pnt& thePnt1,
                                                              const gp_Pnt& thePnt2,
                                                              const gp_Pnt& thePnt3,
                                                              Select3D_TypeOfSensitivity theSensType,
                                                              const SelectMgr_ViewClipRange& theClipRange,
                                                              SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
 
 public:
 
   //! Calculates the point on a view ray that was detected during the run of selection algo by given depth
   Standard_EXPORT virtual gp_Pnt DetectedPoint (const Standard_Real theDepth) const Standard_OVERRIDE;
 
   //! Returns true if selecting volume is overlapped by sphere with center theCenter
   //! and radius theRadius
   Standard_EXPORT virtual Standard_Boolean OverlapsSphere (const gp_Pnt& theCenter,
                                                            const Standard_Real theRadius,
                                                            Standard_Boolean* theInside = NULL) const Standard_OVERRIDE;
 
   //! Returns true if selecting volume is overlapped by sphere with center theCenter
   //! and radius theRadius
   Standard_EXPORT virtual Standard_Boolean OverlapsSphere (const gp_Pnt& theCenter,
                                                            const Standard_Real theRadius,
                                                            const SelectMgr_ViewClipRange& theClipRange,
                                                            SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
 
   //! Returns true if selecting volume is overlapped by cylinder (or cone) with radiuses theBottomRad
   //! and theTopRad, height theHeight and transformation to apply theTrsf.
   Standard_EXPORT virtual Standard_Boolean OverlapsCylinder (const Standard_Real theBottomRad,
                                                              const Standard_Real theTopRad,
                                                              const Standard_Real theHeight,
                                                              const gp_Trsf& theTrsf,
                                                              const Standard_Boolean theIsHollow,
                                                              const SelectMgr_ViewClipRange& theClipRange,
                                                              SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
 
   //! Returns true if selecting volume is overlapped by cylinder (or cone) with radiuses theBottomRad
   //! and theTopRad, height theHeight and transformation to apply theTrsf.
   Standard_EXPORT virtual Standard_Boolean OverlapsCylinder (const Standard_Real theBottomRad,
                                                              const Standard_Real theTopRad,
                                                              const Standard_Real theHeight,
                                                              const gp_Trsf& theTrsf,
                                                              const Standard_Boolean theIsHollow,
                                                              Standard_Boolean* theInside = NULL) const Standard_OVERRIDE;
 
   //! Returns true if selecting volume is overlapped by cylinder (or cone) with radiuses theBottomRad
   //! and theTopRad, height theHeight and transformation to apply theTrsf.
   Standard_EXPORT virtual Standard_Boolean OverlapsCircle (const Standard_Real theBottomRad,
                                                            const gp_Trsf& theTrsf,
                                                            const Standard_Boolean theIsFilled,
                                                            const SelectMgr_ViewClipRange& theClipRange,
                                                            SelectBasics_PickResult& thePickResult) const Standard_OVERRIDE;
 
   //! Returns true if selecting volume is overlapped by cylinder (or cone) with radiuses theBottomRad
   //! and theTopRad, height theHeight and transformation to apply theTrsf.
   Standard_EXPORT virtual Standard_Boolean OverlapsCircle (const Standard_Real theBottomRad,
                                                            const gp_Trsf& theTrsf,
                                                            const Standard_Boolean theIsFilled,
                                                            Standard_Boolean* theInside = NULL) const Standard_OVERRIDE;
 
   //! Stores plane equation coefficients (in the following form:
   //! Ax + By + Cz + D = 0) to the given vector
   Standard_EXPORT virtual void GetPlanes (NCollection_Vector<SelectMgr_Vec4>& thePlaneEquations) const Standard_OVERRIDE;
 
   //! If theIsToAllow is false, only fully included sensitives will be detected, otherwise the algorithm will
   //! mark both included and overlapped entities as matched
   Standard_EXPORT virtual void SetAllowOverlapDetection (const Standard_Boolean theIsToAllow);
 
   //! Dumps the content of me into the stream
   Standard_EXPORT virtual void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const Standard_OVERRIDE;
 
 private:
 
   //! Checks whether the segment intersects with the boundary of the current volume selection
   Standard_EXPORT Standard_Boolean isIntersectBoundary (const gp_Pnt& thePnt1, const gp_Pnt& thePnt2) const;
 
   //! Checks whether the circle intersects with the boundary of the current volume selection
   Standard_EXPORT Standard_Boolean isIntersectBoundary (const Standard_Real theRadius,
                                                         const gp_Trsf& theTrsf,
                                                         const Standard_Boolean theIsFilled) const;
 
   //! Checks whether the triangle intersects with a segment
   Standard_EXPORT static Standard_Boolean segmentTriangleIntersection (const gp_Pnt &theOrig, const gp_Vec& theDir,
                                                                        const gp_Pnt& theV1, const gp_Pnt& theV2, const gp_Pnt& theV3);
 
   Standard_EXPORT static Standard_Boolean segmentSegmentIntersection (const gp_Pnt& theStartPnt1,
                                                                       const gp_Pnt& theEndPnt1,
                                                                       const gp_Pnt& theStartPnt2,
                                                                       const gp_Pnt& theEndPnt2);
 
   Standard_EXPORT static Standard_Boolean pointInTriangle (const gp_Pnt& thePnt,
                                                            const gp_Pnt& theV1, const gp_Pnt& theV2, const gp_Pnt& theV3);
 
 private:
 
   SelectMgr_TriangFrustums      myFrustums;          //!< set of triangular frustums
   SelectionPolyline             mySelPolyline;       //!< parameters of selection polyline (it is used to build triangle frustum set)
   TColgp_Array1OfPnt            myBoundaryPoints;    //!< boundary points
                                                      //!       1_____2
                                                      //!      /|     |\ .
                                                      //!    4/_|_____|_\3
                                                      //!    | 5|_____|6 |
                                                      //!    | /       \ |
                                                      //!   8|/_________\|7
   Standard_Boolean              myToAllowOverlap;    //!< flag to detect only fully included sensitives or not
 };
 
 #endif // _SelectMgr_TriangularFrustumSet_HeaderFile

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