Gabriele Cosmo
416 lines
16 KiB
C++
416 lines
16 KiB
C++
//
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// ********************************************************************
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// * License and Disclaimer *
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// * *
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// * The Geant4 software is copyright of the Copyright Holders of *
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// * the Geant4 Collaboration. It is provided under the terms and *
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// * conditions of the Geant4 Software License, included in the file *
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// * LICENSE and available at http://cern.ch/geant4/license . These *
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// * include a list of copyright holders. *
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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. Please see the license in the file LICENSE and URL above *
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// * for the full disclaimer and the limitation of liability. *
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// * *
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// * This code implementation is the result of the scientific and *
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// * technical work of the GEANT4 collaboration. *
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// * By using, copying, modifying or distributing the software (or *
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// * any work based on the software) you agree to acknowledge its *
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// * use in resulting scientific publications, and indicate your *
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// * acceptance of all terms of the Geant4 Software license. *
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// ********************************************************************
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//
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// G4Trap
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//
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// Class description:
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//
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// A G4Trap is a general trapezoid: The faces perpendicular to the
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// z planes are trapezia, and their centres are not necessarily on
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// a line parallel to the z axis.
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//
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// Note that of the 11 parameters described below, only 9 are really
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// independent - a check for planarity is made in the calculation of the
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// equation for each plane. If the planes are not parallel, a call to
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// G4Exception is made.
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//
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// pDz Half-length along the z-axis
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// pTheta Polar angle of the line joining the centres of the faces
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// at -/+pDz
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// pPhi Azimuthal angle of the line joining the centre of the face at
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// -pDz to the centre of the face at +pDz
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// pDy1 Half-length along y of the face at -pDz
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// pDx1 Half-length along x of the side at y=-pDy1 of the face at -pDz
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// pDx2 Half-length along x of the side at y=+pDy1 of the face at -pDz
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// pAlp1 Angle with respect to the y axis from the centre of the side
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// at y=-pDy1 to the centre at y=+pDy1 of the face at -pDz
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//
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// pDy2 Half-length along y of the face at +pDz
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// pDx3 Half-length along x of the side at y=-pDy2 of the face at +pDz
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// pDx4 Half-length along x of the side at y=+pDy2 of the face at +pDz
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// pAlp2 Angle with respect to the y axis from the centre of the side
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// at y=-pDy2 to the centre at y=+pDy2 of the face at +pDz
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//
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//
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// Member Data:
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//
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// fDz Half-length along the z axis
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// fTthetaCphi = std::tan(pTheta)*std::cos(pPhi)
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// fTthetaSphi = std::tan(pTheta)*std::sin(pPhi)
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// These combinations are suitable for creation of the trapezoid corners
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//
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// fDy1 Half-length along y of the face at -fDz
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// fDx1 Half-length along x of the side at y=-fDy1 of the face at -fDz
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// fDx2 Half-length along x of the side at y=+fDy1 of the face at -fDz
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// fTalpha1 Tan of Angle with respect to the y axis from the centre of
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// the side at y=-fDy1 to the centre at y=+fDy1 of the face
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// at -fDz
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//
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// fDy2 Half-length along y of the face at +fDz
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// fDx3 Half-length along x of the side at y=-fDy2 of the face at +fDz
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// fDx4 Half-length along x of the side at y=+fDy2 of the face at +fDz
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// fTalpha2 Tan of Angle with respect to the y axis from the centre of
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// the side at y=-fDy2 to the centre at y=+fDy2 of the face
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// at +fDz
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//
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// TrapSidePlane fPlanes[4] Plane equations of the faces not at +/-fDz
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// NOTE: order is important !!!
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// Author: Paul Kent, 23.03.1994 - Code converted to tolerant geometry
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// --------------------------------------------------------------------
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#ifndef G4TRAP_HH
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#define G4TRAP_HH
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#include "G4Types.hh"
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struct TrapSidePlane
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{
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G4double a,b,c,d; // Normal unit vector (a,b,c) and offset (d)
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// => Ax+By+Cz+D=0
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};
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#include "G4GeomTypes.hh"
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#if defined(G4GEOM_USE_USOLIDS)
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#define G4GEOM_USE_UTRAP 1
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#endif
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#if defined(G4GEOM_USE_UTRAP)
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#define G4UTrap G4Trap
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#include "G4UTrap.hh"
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#else
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#include "G4CSGSolid.hh"
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/**
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* @brief G4Trap is a general trapezoid: the faces perpendicular to the Z
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* planes are trapezia, and their centres are not necessarily on a line parallel
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* to the Z axis. A check for planarity is made in the calculation of the
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* equation for each plane. If the planes are not parallel, a call to
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* G4Exception is made.
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*/
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class G4Trap : public G4CSGSolid
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{
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public:
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/**
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* The most general constructor for G4Trap which prepares plane
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* equations and corner coordinates from parameters.
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* @param[in] pName The name of the solid.
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* @param[in] pDz Half-length along the Z-axis.
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* @param[in] pTheta Polar angle of the line joining the centres
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* of the faces at -/+pDz.
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* @param[in] pPhi Azimuthal angle of the line joining the centre
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* of the face at -pDz to the centre of the face at +pDz.
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* @param[in] pDy1 Half-length along Y of the face at -pDz.
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* @param[in] pDx1 Half-length along X of the side at y=-pDy1
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* of the face at -pDz.
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* @param[in] pDx2 Half-length along X of the side at y=+pDy1
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* of the face at -pDz.
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* @param[in] pAlp1 Angle with respect to the Y axis from the centre of the
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* side at y=-pDy1 to the centre at y=+pDy1 of the face at -pDz.
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* @param[in] pDy2 Half-length along Y of the face at +pDz.
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* @param[in] pDx3 Half-length along X of the side at y=-pDy2
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* of the face at +pDz.
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* @param[in] pDx4 Half-length along X of the side at y=+pDy2
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* of the face at +pDz.
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* @param[in] pAlp2 Angle with respect to the Y axis from the centre of the
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* side at y=-pDy2 to the centre at y=+pDy2 of the face at +pDz.
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*/
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G4Trap( const G4String& pName,
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G4double pDz,
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G4double pTheta, G4double pPhi,
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G4double pDy1, G4double pDx1, G4double pDx2,
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G4double pAlp1,
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G4double pDy2, G4double pDx3, G4double pDx4,
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G4double pAlp2 );
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/**
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* Prepares plane equations and parameters from corner coordinates.
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* @param[in] pName The name of the solid.
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* @param[in] pt Points of the 8 vertices.
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*/
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G4Trap( const G4String& pName,
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const G4ThreeVector pt[8] ) ;
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/**
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* Constructor for Right Angular Wedge from STEP (assumes pLTX<=pX).
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* @param[in] pName The name of the solid.
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* @param[in] pZ Length along Z.
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* @param[in] pY Length along Y.
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* @param[in] pX Length along X at the wider side.
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* @param[in] pLTX Length along X at the narrower side (plTX<=pX).
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*/
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G4Trap( const G4String& pName,
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G4double pZ,
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G4double pY,
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G4double pX, G4double pLTX );
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/**
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* Constructor for G4Trd.
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* @param[in] pName The name of the solid.
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* @param[in] pDx1 Half-length along X at the surface positioned at -dz.
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* @param[in] pDx2 Half-length along X at the surface positioned at +dz.
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* @param[in] pDy1 Half-length along Y at the surface positioned at -dz.
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* @param[in] pDy2 Half-length along Y at the surface positioned at +dz.
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* @param[in] pDz Half-length along Z axis.
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*/
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G4Trap( const G4String& pName,
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G4double pDx1, G4double pDx2,
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G4double pDy1, G4double pDy2,
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G4double pDz );
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/**
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* Constructor for G4Para.
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* @param[in] pName The name of the solid.
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* @param[in] pDx Half-length in X.
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* @param[in] pDy Half-length in Y.
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* @param[in] pDz Half-length in Z.
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* @param[in] pAlpha Angle formed by the Y axis and the plane joining the
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* centre of the faces parallel to the Z-X plane at -dy and +dy.
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* @param[in] pTheta Polar angle of the line joining the centres of the
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* faces at -dz and +dz in Z.
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* @param[in] pPhi Azimuthal angle of the line joining the centres of
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* the faces at -dz and +dz in Z.
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*/
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G4Trap(const G4String& pName,
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G4double pDx, G4double pDy, G4double pDz,
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G4double pAlpha, G4double pTheta, G4double pPhi );
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/**
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* Constructor for "nominal" G4Trap whose parameters are to be set
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* by a G4VPVParamaterisation later on.
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* @param[in] pName The name of the solid.
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*/
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G4Trap( const G4String& pName );
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/**
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* Default destructor.
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*/
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~G4Trap() override = default;
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/**
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* Accessors. Returning the coordinates of a unit vector along a straight
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* line joining centers of -/+fDz planes.
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*/
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inline G4double GetZHalfLength() const;
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inline G4double GetYHalfLength1() const;
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inline G4double GetXHalfLength1() const;
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inline G4double GetXHalfLength2() const;
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inline G4double GetTanAlpha1() const;
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inline G4double GetYHalfLength2() const;
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inline G4double GetXHalfLength3() const;
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inline G4double GetXHalfLength4() const;
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inline G4double GetTanAlpha2() const;
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/**
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* More accessors.
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*/
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inline TrapSidePlane GetSidePlane( G4int n ) const;
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inline G4ThreeVector GetSymAxis() const;
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/**
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* Accessors obtaining (re)computed values of the original parameters.
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*/
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inline G4double GetPhi() const;
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inline G4double GetTheta() const;
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inline G4double GetAlpha1() const;
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inline G4double GetAlpha2() const;
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/**
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* Sets all parameters, as for constructor. Checks and sets half-widths
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* as well as angles. Makes a final check of co-planarity.
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*/
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void SetAllParameters ( G4double pDz,
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G4double pTheta,
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G4double pPhi,
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G4double pDy1,
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G4double pDx1,
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G4double pDx2,
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G4double pAlp1,
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G4double pDy2,
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G4double pDx3,
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G4double pDx4,
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G4double pAlp2 );
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/**
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* Returning an estimation of the solid volume (capacity) and
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* surface area, in internal units.
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*/
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G4double GetCubicVolume() override;
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G4double GetSurfaceArea() override;
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/**
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* Dispatch method for parameterisation replication mechanism and
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* dimension computation.
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*/
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void ComputeDimensions( G4VPVParameterisation* p,
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const G4int n,
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const G4VPhysicalVolume* pRep ) override;
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/**
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* Computes the bounding limits of the solid.
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* @param[out] pMin The minimum bounding limit point.
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* @param[out] pMax The maximum bounding limit point.
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*/
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void BoundingLimits(G4ThreeVector& pMin, G4ThreeVector& pMax) const override;
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/**
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* Calculates the minimum and maximum extent of the solid, when under the
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* specified transform, and within the specified limits.
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* @param[in] pAxis The axis along which compute the extent.
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* @param[in] pVoxelLimit The limiting space dictated by voxels.
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* @param[in] pTransform The internal transformation applied to the solid.
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* @param[out] pMin The minimum extent value.
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* @param[out] pMax The maximum extent value.
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* @returns True if the solid is intersected by the extent region.
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*/
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G4bool CalculateExtent(const EAxis pAxis,
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const G4VoxelLimits& pVoxelLimit,
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const G4AffineTransform& pTransform,
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G4double& pMin, G4double& pMax) const override;
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/**
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* Concrete implementations of the expected query interfaces for
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* solids, as defined in the base class G4VSolid.
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*/
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EInside Inside( const G4ThreeVector& p ) const override;
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G4ThreeVector SurfaceNormal( const G4ThreeVector& p ) const override;
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G4double DistanceToIn(const G4ThreeVector& p,
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const G4ThreeVector& v) const override;
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G4double DistanceToIn( const G4ThreeVector& p ) const override;
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G4double DistanceToOut(const G4ThreeVector& p, const G4ThreeVector& v,
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const G4bool calcNorm = false,
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G4bool* validNorm = nullptr,
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G4ThreeVector* n = nullptr) const override;
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G4double DistanceToOut( const G4ThreeVector& p ) const override;
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/**
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* Returns the type ID, "G4Trap" of the solid.
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*/
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G4GeometryType GetEntityType() const override;
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/**
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* Returns a random point located and uniformly distributed on the
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* surface of the solid.
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*/
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G4ThreeVector GetPointOnSurface() const override;
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/**
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* Returns true as the solid has only planar faces.
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*/
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G4bool IsFaceted() const override;
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/**
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* Makes a clone of the object for use in multi-treading.
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* @returns A pointer to the new cloned allocated solid.
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*/
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G4VSolid* Clone() const override;
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/**
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* Streams the object contents to an output stream.
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*/
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std::ostream& StreamInfo( std::ostream& os ) const override;
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/**
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* Methods for creating graphical representations (i.e. for visualisation).
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*/
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void DescribeYourselfTo (G4VGraphicsScene& scene) const override;
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G4Polyhedron* CreatePolyhedron () const override;
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/**
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* Fake default constructor for usage restricted to direct object
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* persistency for clients requiring preallocation of memory for
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* persistifiable objects.
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*/
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G4Trap(__void__&);
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/**
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* Copy constructor and assignment operator.
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*/
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G4Trap(const G4Trap& rhs);
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G4Trap& operator=(const G4Trap& rhs);
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protected:
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/**
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* Internal methods for checking and building planes.
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* Computing the vertices and setting side planes, checking for planarity.
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*/
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void MakePlanes();
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void MakePlanes( const G4ThreeVector pt[8] );
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/**
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* Calculates the coefficents of the plane p1->p2->p3->p4->p1
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* where the ThreeVectors 1-4 are in anti-clockwise order when viewed
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* from infront of the plane (i.e. from normal direction).
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* @return true if the points are co-planar, false otherwise.
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*/
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G4bool MakePlane( const G4ThreeVector& p1,
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const G4ThreeVector& p2,
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const G4ThreeVector& p3,
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const G4ThreeVector& p4,
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TrapSidePlane& plane ) ;
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/**
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* Recomputes parameters using planes.
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*/
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void SetCachedValues();
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private:
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/**
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* Checks the input parameters.
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*/
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void CheckParameters();
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/**
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* Computes the coordinates of the trap vertices from planes.
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*/
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void GetVertices(G4ThreeVector pt[8]) const;
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/**
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* Algorithm for SurfaceNormal() following the original specification
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* for points not on the surface.
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*/
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G4ThreeVector ApproxSurfaceNormal( const G4ThreeVector& p ) const;
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private:
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G4double halfCarTolerance;
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G4double fDz,fTthetaCphi,fTthetaSphi;
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G4double fDy1,fDx1,fDx2,fTalpha1;
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G4double fDy2,fDx3,fDx4,fTalpha2;
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TrapSidePlane fPlanes[4];
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G4double fAreas[6];
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G4int fTrapType;
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};
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#include "G4Trap.icc"
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#endif
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#endif
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