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//
// G4Trd
//
// Class description:
//
//   A G4Trd is a trapezoid with the x and y dimensions varying along z
//   functions:
//
//   Member Data:
//
//     fDx1    Half-length along x at the surface positioned at -dz
//     fDx2    Half-length along x at the surface positioned at +dz
//     fDy1    Half-length along y at the surface positioned at -dz
//     fDy2    Half-length along y at the surface positioned at +dz
//     fDz     Half-length along z axis

// 12.01.95 P.Kent: Old prototype code converted to thick geometry
// 21.04.97 J.Apostolakis: Added Set Methods
// 19.11.99 V.Grichine: kUndefined was added to Eside enum
// --------------------------------------------------------------------
#ifndef G4TRD_HH
#define G4TRD_HH

#include "G4GeomTypes.hh"

#if defined(G4GEOM_USE_USOLIDS)
#define G4GEOM_USE_UTRD 1
#endif

#if defined(G4GEOM_USE_UTRD)
  #define G4UTrd G4Trd
  #include "G4UTrd.hh"
#else

#include "G4CSGSolid.hh"
#include "G4Polyhedron.hh"

class G4Trd : public G4CSGSolid
{
  public:  // with description

    G4Trd( const G4String& pName,
                 G4double pdx1, G4double pdx2,
                 G4double pdy1, G4double pdy2,
                 G4double pdz );
      //
      // Constructs a trapezoid with name, and half lengths

   ~G4Trd();
      //
      // Destructor

    // Accessors

    inline G4double GetXHalfLength1() const;
    inline G4double GetXHalfLength2() const;
    inline G4double GetYHalfLength1() const;
    inline G4double GetYHalfLength2() const;
    inline G4double GetZHalfLength()  const;

    // Modifiers

    inline void SetXHalfLength1(G4double val);
    inline void SetXHalfLength2(G4double val);
    inline void SetYHalfLength1(G4double val);
    inline void SetYHalfLength2(G4double val);
    inline void SetZHalfLength(G4double val);

    void SetAllParameters ( G4double pdx1, G4double pdx2,
                            G4double pdy1, G4double pdy2,
                            G4double pdz );

    // Methods of solid

    G4double GetCubicVolume();
    G4double GetSurfaceArea();

    void ComputeDimensions(       G4VPVParameterisation* p,
                            const G4int n,
                            const G4VPhysicalVolume* pRep );

    void BoundingLimits(G4ThreeVector& pMin, G4ThreeVector& pMax) const;

    G4bool CalculateExtent( const EAxis pAxis,
                            const G4VoxelLimits& pVoxelLimit,
                            const G4AffineTransform& pTransform,
                                  G4double& pMin, G4double& pMax ) const;

    EInside Inside( const G4ThreeVector& p ) const;

    G4ThreeVector SurfaceNormal( const G4ThreeVector& p ) const;

    G4double DistanceToIn( const G4ThreeVector& p,
                           const G4ThreeVector& v ) const;

    G4double DistanceToIn( const G4ThreeVector& p ) const;

    G4double DistanceToOut( const G4ThreeVector& p,
                            const G4ThreeVector& v,
                            const G4bool calcNorm = false,
                                  G4bool* validNorm = nullptr,
                                  G4ThreeVector* n = nullptr ) const;

    G4double DistanceToOut( const G4ThreeVector& p ) const;

    G4GeometryType GetEntityType() const;

    G4ThreeVector GetPointOnSurface() const;

    G4VSolid* Clone() const;

    std::ostream& StreamInfo( std::ostream& os ) const;

    // Visualisation functions

    void          DescribeYourselfTo (G4VGraphicsScene& scene) const;
    G4Polyhedron* CreatePolyhedron   () const;

  public:  // without description

    G4Trd(__void__&);
      // Fake default constructor for usage restricted to direct object
      // persistency for clients requiring preallocation of memory for
      // persistifiable objects.

    G4Trd(const G4Trd& rhs);
    G4Trd& operator=(const G4Trd& rhs);
      // Copy constructor and assignment operator

  private:

    void CheckParameters();
      // Check parameters

    void MakePlanes();
      // Set side planes

    G4ThreeVector ApproxSurfaceNormal( const G4ThreeVector& p ) const;
      // Algorithm for SurfaceNormal() following the original
      // specification for points not on the surface

  private:

    G4double halfCarTolerance;
    G4double fDx1,fDx2,fDy1,fDy2,fDz;
    struct { G4double a,b,c,d; } fPlanes[4];
};

#include "G4Trd.icc"

#endif

#endif
