G4SphericalSurface.hh

Go to the documentation of this file.

//
// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
//
// $Id$
//
// ----------------------------------------------------------------------
// Class G4SphericalSurface
//
// Class description:
// 
// Definition of a spherical surface.
 
// The code for G4SphericalSurface has been derived from the original
// implementation in the "Gismo" package.
//
// Authors: L.Lim, A.Breakstone.
// Adaptation: J.Sulkimo, P.Urban.
// Revisions by: L.Broglia, G.Cosmo.
// ----------------------------------------------------------------------
#ifndef __G4SpheShell_H
#define __G4SpheShell_H
 
#include "G4Surface.hh"
#include "G4ThreeMat.hh"
 
class G4SphericalSurface : public G4Surface
{
 
 public:  // with description
 
  G4SphericalSurface();
    // Default constructor.
 
  G4SphericalSurface( const G4Vector3D& o, 
              const G4Vector3D& xhat, const G4Vector3D& zhat,
              G4double r, 
              G4double ph1, G4double ph2,
              G4double th1, G4double th2 ); 
    // Normal constructor:
    //   first argument is the origin of the G4SphericalSurface
    //   second argument is the axis of the G4SphericalSurface
    //      which defines azimuthal angle equals zero
    //   third argument is the axis of the G4SphericalSurface
    //          which defines polar angle equals zero
    //   fourth argument is the radius of the G4SphericalSurface
    //   fifth argument is the lower azimuthal angle limit of the surface
    //   sixth argument is the upper azimuthal angle limit of the surface
    //   seventh argument is the lower polar angle limit of the surface
    //   eigth argument is the upper polar angle limit of the surface
 
  virtual ~G4SphericalSurface();
    // Destructor.
 
  inline G4int operator==( const G4SphericalSurface& s );
    // Equality operator.
 
  inline G4String GetEntityType() const;
    // Returns the type identifier.
 
  virtual const char* NameOf() const;
    // Returns the class name.
 
  virtual void PrintOn( std::ostream& os = G4cout ) const;
    // Printing function, streaming surface's attributes.
 
  G4int Intersect(const G4Ray&);
    // Returns the distance along a Ray (straight line with G4Vector3D) to
    // leave or enter a G4SphericalSurface.
    // If the G4Vector3D of the Ray is opposite to that of the Normal to
    // the G4SphericalSurface at the intersection point, it will not leave the
    // G4SphericalSurface.
    // Similarly, if the G4Vector3D of the Ray is along that of the Normal 
    // to the G4SphericalSurface at the intersection point, it will not enter 
    // the G4SphericalSurface.
    // This method is called by all finite shapes sub-classed to 
    // G4SphericalSurface.
    // A negative result means no intersection.
    // If no valid intersection point is found, set the distance
    // and intersection point to large numbers.
 
  void CalcBBox();
    // Computes the bounding-box.
 
  inline void Comp(G4Vector3D& v, G4Point3D& min , G4Point3D& max);
    // Compares the x,y and z values of v and min
    // versus v and max. min/max-values are replaced if 
    // greater/smaller than v-values.
 
  virtual G4double HowNear( const G4Vector3D& x ) const;
    // Returns the distance from a point to a G4SphericalSurface
    // The point x is the (input) argument.
    // The distance is positive if the point is Inside, negative if it
    // is outside
  
  virtual G4Vector3D SurfaceNormal( const G4Point3D& p ) const;
    // Returns the Normal unit vector to the G4SphericalSurface at a point p 
    // on (or nearly on) the G4SphericalSurface.
 
  virtual G4int Inside( const G4Vector3D& x ) const;
    // Returns 1 if the point x is Inside the G4SphericalSurface, 0 otherwise.
 
  virtual G4int WithinBoundary( const G4Vector3D& x ) const;
    // Returns 1 if the point x is within the boundary, 0 otherwise.
 
  virtual G4double Scale() const;
    // Returns the radius, unless it is zero, in which case it
    // returns 1.  Used for Scale-invariant tests of surface thickness.
 
  virtual G4double Area() const; 
    // Calculates the area of a G4SphericalSurface.
 
  virtual void resize( G4double r, G4double ph1, G4double ph2, 
               G4double th1, G4double th2);
    // Resizes the G4SphericalSurface to new radius and angle limits.
    //   first argument is the radius of the G4SphericalSurface
    //   second argument is the lower azimuthal angle limit of the surface
    //   third argument is the upper azimuthal angle limit of the surface
    //   fourth argument is the lower polar angle limit of the surface
    //   fifth argument is the upper polar angle limit of the surface
 
  inline G4Vector3D GetXAxis() const;
  inline G4Vector3D GetZAxis() const;
  inline G4double   GetRadius() const;
  inline G4double   GetPhi1() const;
  inline G4double   GetPhi2() const;
  inline G4double   GetTheta1() const;
  inline G4double   GetTheta2() const;
    // Accessors methodss to return the axes, radius, and angles
    // of the G4SphericalSurface.
 
 public:  // without description
 
  virtual G4Vector3D Normal( const G4Vector3D& p ) const;
    // Returns the Normal unit vector as for SurfaceNormal().
 
/*
  virtual G4double distanceAlongRay( G4int which_way, const G4Ray* ry,
                                     G4ThreeVec& p ) const;
    // Returns the distance along a Ray to enter or leave a G4SphericalSurface.  
    //   The first (input) argument is +1 to leave or -1 to enter
    //   The second (input) argument is a pointer to the Ray
    //   The third (output) argument returns the intersection point.
 
  virtual G4double distanceAlongHelix( G4int which_way, const Helix* hx,
                                       G4ThreeVec& p ) const;
    // Returns the distance along a Helix to enter or leave a G4SphericalSurface.  
    //   The first (input) argument is +1 to leave or -1 to enter
    //   The second (input) argument is a pointer to the Helix
    //   The third (output) argument returns the intersection point.
 
  virtual G4Vector3D Normal( const G4Point3D& p ) const;
    // Returns the Normal unit vector to a G4SphericalSurface at a point p
    // on (or nearly on) the G4SphericalSurface.
 
  virtual void rotate( G4double alpha, G4double beta, 
                       G4double gamma, G4ThreeMat& m, G4int inverse );
    // Rotates the G4SphericalSurface (angles are assumed to be given in
    // radians), arguments:
    // - first about global x_axis by angle alpha,
    // - second about global y-axis by angle beta,
    //  - third about global z_axis by angle gamma,
    //  - fourth (output) argument gives the calculated rotation matrix,
    // - fifth (input) argument is an integer flag which if
    //   non-zero reverses the order of the rotations.
 
  virtual void rotate( G4double alpha, G4double beta, 
                       G4double gamma, G4int inverse ); 
    // Rotates the G4SphericalSurface (angles are assumed to be given in
    // radians), arguments:
    //  - first about global x_axis by angle alpha,
    // - second about global y-axis by angle beta,
    // - third about global z_axis by angle gamma,
    // - fourth (input) argument is an integer flag which if
    //   non-zero reverses the order of the rotations.
*/
 
 protected:  // with description
 
  G4Vector3D x_axis;
    // Direction (unit vector) of axis of G4SphericalSurface
    // which defines azimuthal angle of zero.
 
  G4Vector3D z_axis;
    // Direction (unit vector) of axis of G4SphericalSurface
    // which defines polar angle of zero.
    
  G4double radius;
    // Radius of G4SphericalSurface.
 
  G4double phi_1;
    // Lower azimuthal angle limit of G4SphericalSurface
    // (in radians).  Allowed range: 0 <= phi_1 < 2*PI.
  
  G4double phi_2;
    // Upper azimuthal angle limit of G4SphericalSurface
    // (in radians).  Allowed range: phi_1 < phi_2 <= phi_1 + 2*PI
 
  G4double theta_1;
    // Lower polar angle limit of G4SphericalSurface
    // (in radians).  Allowed range: 0 <= theta_1 < PI.
    
  G4double theta_2;
    // Upper polar angle limit of G4SphericalSurface
    // (in radians).  Allowed range: theta_1 < theta_2 <= theta_1 + PI.
 
 private:
 
  G4SphericalSurface(const G4SphericalSurface&);
  G4SphericalSurface& operator=(const G4SphericalSurface&);
    // Private copy constructor and assignment operator.
 
  // virtual G4double gropeAlongHelix( const Helix* hx ) const;
    // Private function to use a crude technique to find the intersection
    // of a Helix with a G4SphericalSurface.  It returns the turning angle 
    // along the Helix at which the intersection occurs or -1.0 if no
    // intersection point is found.  The argument to the call is the pointer
    // to the Helix.
 
};
 
#include "G4SphericalSurface.icc"
 
#endif