Gabriele Cosmo
207 lines
8.4 KiB
C++
207 lines
8.4 KiB
C++
//
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// ********************************************************************
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// * DISCLAIMER *
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// * *
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// * The following disclaimer summarizes all the specific disclaimers *
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// * of contributors to this software. The specific disclaimers,which *
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// * govern, are listed with their locations in: *
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// * http://cern.ch/geant4/license *
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// * *
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// * Neither the authors of this software system, nor their employing *
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// * institutes,nor the agencies providing financial support for this *
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// * work make any representation or warranty, express or implied, *
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// * regarding this software system or assume any liability for its *
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// * use. *
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// * *
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// * This code implementation is the intellectual property of the *
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// * GEANT4 collaboration. *
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// * By copying, distributing or modifying the Program (or any work *
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// * based on the Program) you indicate your acceptance of this *
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// * statement, and all its terms. *
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// ********************************************************************
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//
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//
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// $Id: G4ConicalSurface.hh,v 1.8 2001/07/11 09:59:32 gunter Exp $
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// GEANT4 tag $Name: geant4-05-00 $
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//
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// ----------------------------------------------------------------------
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// Class G4ConicalSurface
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//
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// Class Description:
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//
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// A G4ConicalSurface is a semi-infinite conical surface defined by
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// an axis and an opening angle, defined as the angle between the axis
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// and the conical surface, with the origin being the apex of the cone.
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// The code for G4ConicalSurface has been derived from the original
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// implementation in the "Gismo" package.
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//
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// Author: A.Breakstone
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// Adaptation: J.Sulkimo, P.Urban.
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// Revisions by: L.Broglia, G.Cosmo.
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// ----------------------------------------------------------------------
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#ifndef __G4CONICALSURFACE_H
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#define __G4CONICALSURFACE_H
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#include "G4Surface.hh"
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class G4ConicalSurface : public G4Surface
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{
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public: // with description
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G4ConicalSurface();
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// Default constructor:
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// default axis is ( 1.0, 0.0, 0.0 ),
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// default angle is 1.0 radians.
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G4ConicalSurface( const G4Point3D& o, const G4Vector3D& a, G4double e );
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// Normal constructor:
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// first argument is the origin of the G4ConicalSurface
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// second argument is the axis of the G4ConicalSurface
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// third argument is the angle of the G4ConicalSurface.
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virtual ~G4ConicalSurface();
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// Virtual destructor.
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inline G4int operator==( const G4ConicalSurface& c );
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// Equality operator.
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inline G4String GetEntityType() const;
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// Returns type identifier of the shape.
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virtual const char* NameOf() const;
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// Returns the class name.
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virtual void PrintOn( G4std::ostream& os = G4cout ) const;
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// Printing function, streaming surface's attributes.
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virtual G4double HowNear( const G4Vector3D& x ) const;
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// Returns the distance from a point to a semi-infinite G4ConicalSurface.
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// The point x is the (input) argument.
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// The distance is positive if the point is Inside, negative if it
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// is outside
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void CalcBBox();
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// Computes the bounding-box.
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G4int Intersect( const G4Ray& ry );
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// Returns the distance along a Ray (straight line with G4Vector3D) to
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// leave or enter a G4ConicalSurface.
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// If the G4Vector3D of the Ray is opposite to that of the Normal to
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// the G4ConicalSurface at the intersection point, it will not leave the
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// G4ConicalSurface.
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// Similarly, if the G4Vector3D of the Ray is along that of the Normal
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// to the G4ConicalSurface at the intersection point, it will not enter the
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// G4ConicalSurface.
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// This method is called by all finite shapes sub-classed to
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// G4ConicalSurface.
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// A negative result means no intersection.
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// If no valid intersection point is found, set the distance
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// and intersection point to large numbers.
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virtual G4Vector3D SurfaceNormal( const G4Point3D& p ) const;
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// Returns the Normal unit vector to the G4ConicalSurface at a point p
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// on (or nearly on) the G4ConicalSurface.
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virtual G4int Inside( const G4Vector3D& x ) const;
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// Returns 1 if the point x is Inside the G4ConicalSurface, 0 otherwise.
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// Outside means that the distance to the G4ConicalSurface would be
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// negative. Uses the HowNear() function to calculate this distance.
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virtual G4int WithinBoundary( const G4Vector3D& x ) const;
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// Returns 1 if point x is on the G4ConicalSurface, otherwise return zero
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// Since a G4ConicalSurface is infinite in extent, the function
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// will just check if the point is on the G4ConicalSurface (to the surface
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// precision).
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virtual G4double Scale() const;
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// Function overwritten by finite-sized derived classes which returns
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// a radius, unless it is zero, in which case it returns the smallest
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// non-zero dimension.
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// Since a semi-infinite cone has no Scale associated with it, it returns
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// the arbitrary number 1.0.
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// Used for Scale-invariant tests of surface thickness.
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inline G4Vector3D GetAxis() const;
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inline G4double GetAngle() const;
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// Return the axis and angle of the G4ConicalSurface.
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void SetAngle( G4double e );
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// Changes the angle of the G4ConicalSurface.
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// Requires angle to range from 0 to PI/2.
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public: // without description
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/*
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virtual G4double distanceAlongRay( G4int which_way, const G4Ray* ry,
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G4Vector3D& p ) const;
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// Returns the distance along a Ray to enter or leave a G4ConicalSurface.
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// The first (input) argument is +1 to leave or -1 to enter
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// The second (input) argument is a pointer to the Ray
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// The third (output) argument returns the intersection point.
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virtual G4double distanceAlongHelix( G4int which_way, const Helix* hx,
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G4Vector3D& p ) const;
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// Returns the distance along a Helix to enter or leave a G4ConicalSurface.
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// The first (input) argument is +1 to leave or -1 to enter
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// The second (input) argument is a pointer to the Helix
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// The third (output) argument returns the intersection point.
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G4Vector3D Normal( const G4Vector3D& p ) const;
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// Returns the Normal unit vector to a G4ConicalSurface
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// at a point p on (or nearly on) the G4ConicalSurface.
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virtual void rotate( G4double alpha, G4double beta,
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G4double gamma, G4ThreeMat& m, G4int inverse );
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// Rotates the G4ConicalSurface (angles are assumed to be given in
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// radians), arguments:
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// - first about global x-axis by angle alpha,
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// - second about global y-axis by angle beta,
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// - third about global z-axis by angle gamma,
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// - fourth (output) argument gives the calculated rotation matrix,
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// - fifth (input) argument is an integer flag which if
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// non-zero reverses the order of the rotations.
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virtual void rotate( G4double alpha, G4double beta,
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G4double gamma, G4int inverse );
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// Rotates the G4ConicalSurface (angles are assumed to be given in
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// radians), arguments:
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// - first about global x-axis by angle alpha,
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// - second about global y-axis by angle beta,
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// - third about global z-axis by angle gamma,
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// - fourth (input) argument is an integer flag which if
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// non-zero reverses the order of the rotations.
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private:
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virtual G4double gropeAlongHelix( const Helix* hx ) const;
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// Private function to use a crude technique to find the intersection
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// of a Helix with a G4ConicalSurface. It returns the turning angle
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// along the Helix at which the intersection occurs or -1.0 if no
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// intersection point is found.
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// The argument to the call is the pointer to the Helix.
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*/
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private:
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G4ConicalSurface(const G4ConicalSurface&);
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G4ConicalSurface& operator=(const G4ConicalSurface&);
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// Private copy constructor and assignment operator.
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private:
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G4Vector3D axis;
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// Direction of axis of G4ConicalSurface (unit vector).
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G4double angle;
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// Half opening angle of G4ConicalSurface, in radians
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// range is 0 < angle < PI/2.
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};
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#include "G4ConicalSurface.icc"
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#endif
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