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//
// $Id: G4TwistedTrap.hh,v 1.10 2006/06/29 18:48:02 gunter Exp $
// GEANT4 tag $Name: geant4-09-02-ref-02 $
//
// 
// --------------------------------------------------------------------
// GEANT 4 class header file
//
//
// G4TwistedTrap
//
// Class description:
//
//  A G4TwistedTrap is a general twisted trapezoid: The faces perpendicular to the
//  z planes are trapezia, and their centres are not necessarily on
//  a line parallel to the z axis.
//
//      pDz     Half-length along the z-axis
//      pTheta  Polar angle of the line joining the centres of the faces
//              at -/+pDz
//      pPhi    Azimuthal angle of the line joing the centre of the face at
//              -pDz to the centre of the face at +pDz
//      pDy1    Half-length along y of the face at -pDz
//      pDx1    Half-length along x of the side at y=-pDy1 of the face at -pDz
//      pDx2    Half-length along x of the side at y=+pDy1 of the face at -pDz
//
//      pDy2    Half-length along y of the face at +pDz
//      pDx3    Half-length along x of the side at y=-pDy2 of the face at +pDz
//      pDx4    Half-length along x of the side at y=+pDy2 of the face at +pDz
//      pAlph   Angle with respect to the y axis from the centre of the side
//
//
//  A special regular case of a trapezoid with equal endcaps is available, 
//  with polar,azimuthal and tilt angles set to zero.
//
 
// Author:
//
//   27-Oct-2004 - O.Link (Oliver.Link@cern.ch)
//
// --------------------------------------------------------------------
#ifndef __G4TWISTEDTRAP__
#define __G4TWISTEDTRAP__

#include "G4VTwistedFaceted.hh"

class G4TwistedTrap : public G4VTwistedFaceted
{
  public:  // with description

    G4TwistedTrap(const G4String &pName,
                        G4double  pPhiTwist,
                        G4double  pDx1,  // half x length at -pDz,-pDy
                        G4double  pDx2,  // half x length at -pDz,+pDy
                        G4double  pDy,
                        G4double  pDz);


    G4TwistedTrap(const G4String &pName,       // Name of instance
                        G4double  pPhiTwist,   // twist angle
                        G4double  pDz,     // half z length
                        G4double  pTheta,  // direction between end planes
                        G4double  pPhi,    // defined by polar and azim. angles
                        G4double  pDy1,    // half y length at -pDz
                        G4double  pDx1,    // half x length at -pDz,-pDy
                        G4double  pDx2,    // half x length at -pDz,+pDy
                        G4double  pDy2,    // half y length at +pDz
                        G4double  pDx3,    // half x length at +pDz,-pDy
                        G4double  pDx4,    // half x length at +pDz,+pDy
                        G4double  pAlph    // tilt angle
                  );
 
    virtual ~G4TwistedTrap();

    // accessors

    inline G4double GetY1HalfLength() const { return GetDy1() ; }
    inline G4double GetX1HalfLength() const { return GetDx1() ; }
    inline G4double GetX2HalfLength() const { return GetDx2() ; }
    inline G4double GetY2HalfLength() const { return GetDy2() ; }
    inline G4double GetX3HalfLength() const { return GetDx3() ; }
    inline G4double GetX4HalfLength() const { return GetDx4() ; }
    inline G4double GetZHalfLength()  const { return GetDz()  ; }
    inline G4double GetPhiTwist()     const { return GetTwistAngle() ; }
    inline G4double GetTiltAngleAlpha()    const { return GetAlpha() ; }
    inline G4double GetPolarAngleTheta()   const { return GetTheta() ; }
    inline G4double GetAzimuthalAnglePhi() const { return GetPhi()   ; }

    G4GeometryType GetEntityType() const;

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

  public:  // without description

    G4TwistedTrap(__void__&);
      // Fake default constructor for usage restricted to direct object
      // persistency for clients requiring preallocation of memory for
      // persistifiable objects.

} ;

#endif