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// --------------------------------------------------------------------
// GEANT 4 class header file
//
// G4EllipticalCone
//
// Class description:
//
// G4EllipticalCone is a full cone with elliptical base which can be cut in Z.
//
// Member Data:
//
//      xSemiAxis       semi-axis, x, without dimentions
//      ySemiAxis       semi-axis, y, without dimentions
//      zheight         height, z
//      zTopCut         upper cut plane level, z 
//
// The height in Z corresponds to where the elliptical cone hits the 
// Z-axis if it had no Z cut. Also the cone is centered at zero having a
// base at zTopCut and another at -zTopCut. The semi-major axes at the Z=0
// plane are given by xSemiAxis*zheight and ySemiAxis*zheight so that the
// curved surface of our cone satisfies the equation: 
//
// ***************************************************************************
// *                                                                         *
// *           (x/xSemiAxis)^2 + (y/ySemiAxis)^2 = (zheight - z)^2           * 
// *                                                                         *
// ***************************************************************************
//
// In case you want to construct G4EllipticalCone from:
//   1. halflength in Z = zTopCut
//   2. Dx and Dy =  halflength of ellipse axis  at  z = -zTopCut
//   3. dx and dy =  halflength of ellipse axis  at  z =  zTopCut
//      ! Attention :  dx/dy=Dx/Dy 
//
// You need to find xSemiAxis,ySemiAxis and zheight:
//
//  xSemiAxis = (Dx-dx)/(2*zTopCut)
//  ySemiAxis = (Dy-dy)/(2*zTopCut)
//    zheight = (Dx+dx)/(2*xSemiAxis)

// First implementation:
//   Dionysios Anninos, 8.9.2005
// 
// Revisions:
//   Lukas Lindroos, Tatiana Nikitina, 20.08.2007
//   Evgueni Tcherniaev, 20.07.2017
//
// --------------------------------------------------------------------
#ifndef G4EllipticalCone_HH
#define G4EllipticalCone_HH

#include <CLHEP/Units/PhysicalConstants.h>

#include "G4VSolid.hh"
#include "G4Polyhedron.hh"

class G4EllipticalCone : public G4VSolid
{
  public:  // with description
   
    G4EllipticalCone(const G4String& pName,
                           G4double  pxSemiAxis,
                           G4double  pySemiAxis,
                           G4double  zMax,
                           G4double  pzTopCut);

    virtual ~G4EllipticalCone();

    // Access functions
    //
    inline G4double GetSemiAxisMin () const;
    inline G4double GetSemiAxisMax () const;
    inline G4double GetSemiAxisX () const;
    inline G4double GetSemiAxisY () const;
    inline G4double GetZMax() const;
    inline G4double GetZTopCut() const;
    inline void SetSemiAxis (G4double x, G4double y, G4double z);
    inline void SetZCut (G4double newzTopCut);

    G4double GetCubicVolume(); 
    G4double GetSurfaceArea();

    // Solid standard methods
    //
    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=G4bool(false),
                                 G4bool *validNorm=0,
                                 G4ThreeVector *n=0) const;

    G4double DistanceToOut(const G4ThreeVector& p) const;

    G4GeometryType GetEntityType() const;
  
    G4VSolid* Clone() const;

    G4ThreeVector GetPointOnSurface() const;

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

    // Visualisation functions
    //
    G4Polyhedron* GetPolyhedron () const;
    void DescribeYourselfTo(G4VGraphicsScene& scene) const;
    G4VisExtent   GetExtent() const;
    G4Polyhedron* CreatePolyhedron() const;
       
  public:  // without description

    G4EllipticalCone(__void__&);
      // Fake default constructor for usage restricted to direct object
      // persistency for clients requiring preallocation of memory for
      // persistifiable objects.

    G4EllipticalCone(const G4EllipticalCone& rhs);
    G4EllipticalCone& operator=(const G4EllipticalCone& rhs); 
      // Copy constructor and assignment operator.

  protected:  // without description
 
    mutable G4bool fRebuildPolyhedron;
    mutable G4Polyhedron* fpPolyhedron;

  private:

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

  private:

    G4double halfCarTol;
    G4double fCubicVolume;
    G4double fSurfaceArea;
    G4double xSemiAxis, ySemiAxis, zheight, zTopCut;
    G4double cosAxisMin, invXX, invYY;
};

#include "G4EllipticalCone.icc"

#endif
