Gabriele Cosmo
284 lines
11 KiB
C++
284 lines
11 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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//
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// $Id: G4Trap.hh,v 1.17 2006/10/19 15:33:37 gcosmo Exp $
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// GEANT4 tag $Name: geant4-08-02 $
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//
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//
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// --------------------------------------------------------------------
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// GEANT 4 class header file
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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 joing 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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// History:
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//
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// 23.3.94 P.Kent: Old C++ code converted to tolerant geometry
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// 9.9.96 V.Grichine: Final modifications before to commit
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// 1.11.96 V.Grichine: Costructors for Right Angular Wedge from STEP, G4Trd/Para
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// 8.12.97 J.Allison: Added "nominal" contructor and method SetAllParameters.
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// --------------------------------------------------------------------
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#ifndef G4Trap_HH
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#define G4Trap_HH
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#include "G4CSGSolid.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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class G4Trap : public G4CSGSolid
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{
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public: // with description
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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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// The most general constructor for G4Trap which prepares plane
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// equations and corner coordinates from parameters
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G4Trap( const G4String& pName,
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const G4ThreeVector pt[8] ) ;
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//
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// Prepares plane equations and parameters from corner coordinates
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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 Right Angular Wedge from STEP (assumes pLTX<=pX)
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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 G4Trd
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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 G4Para
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G4Trap( const G4String& pName );
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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
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virtual ~G4Trap() ;
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//
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// Destructor
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// Accessors
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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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// Returns coordinates of unit vector along straight
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// line joining centers of -/+fDz planes
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inline TrapSidePlane GetSidePlane( G4int n ) const;
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inline G4ThreeVector GetSymAxis() const;
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// Modifiers
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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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// Methods for solid
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inline G4double GetCubicVolume();
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inline G4double GetSurfaceArea();
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void ComputeDimensions( G4VPVParameterisation* p,
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const G4int n,
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const G4VPhysicalVolume* pRep );
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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;
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EInside Inside( const G4ThreeVector& p ) const;
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G4ThreeVector SurfaceNormal( const G4ThreeVector& p ) const;
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G4double DistanceToIn(const G4ThreeVector& p, const G4ThreeVector& v) const;
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G4double DistanceToIn( const G4ThreeVector& p ) const;
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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=0, G4ThreeVector *n=0) const;
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G4double DistanceToOut( const G4ThreeVector& p ) const;
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G4GeometryType GetEntityType() const;
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G4ThreeVector GetPointOnSurface() const;
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std::ostream& StreamInfo( std::ostream& os ) const;
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// Visualisation functions
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void DescribeYourselfTo ( G4VGraphicsScene& scene ) const;
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G4Polyhedron* CreatePolyhedron () const;
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G4NURBS* CreateNURBS () const;
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public: // without description
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G4Trap(__void__&);
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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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protected: // with description
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G4bool MakePlanes();
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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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G4ThreeVectorList*
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CreateRotatedVertices( const G4AffineTransform& pTransform ) const;
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//
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// Creates the List of transformed vertices in the format required
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// for G4CSGSolid:: ClipCrossSection and ClipBetweenSections
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private:
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G4ThreeVector ApproxSurfaceNormal( const G4ThreeVector& p ) const;
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// Algorithm for SurfaceNormal() following the original
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// specification for points not on the surface
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inline G4double GetFaceArea(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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//
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// Provided four corners of plane in clockwise fashion,
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// it returns the area of finite face
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G4ThreeVector GetPointOnPlane(G4ThreeVector p0, G4ThreeVector p1,
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G4ThreeVector p2, G4ThreeVector p3,
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G4double& area) const;
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//
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// Returns a random point on the surface of one of the faces
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private:
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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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};
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#include "G4Trap.icc"
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#endif
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