Gabriele Cosmo
163 lines
5.8 KiB
C++
163 lines
5.8 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: G4TwistedTrapSide.hh,v 1.7 2004/12/08 10:20:34 link Exp $
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// GEANT4 tag $Name: geant4-07-00-cand-03 $
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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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//
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// G4TwistedTrapSide
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//
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// Class description:
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//
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// Class describing a twisted boundary surface for a trapezoid.
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// Author:
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//
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// Oliver Link (Oliver.Link@cern.ch)
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//
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// --------------------------------------------------------------------
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#ifndef __G4TWISTEDTRAPSIDE__
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#define __G4TWISTEDTRAPSIDE__
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#include "G4VSurface.hh"
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#include <vector>
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class G4TwistedTrapSide : public G4VSurface
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{
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public: // with description
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G4TwistedTrapSide(const G4String &name,
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G4double PhiTwist,
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G4double pDx1,
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G4double pDx2,
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G4double pDy,
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G4double pDz,
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G4double AngleSide);
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virtual ~G4TwistedTrapSide();
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virtual G4ThreeVector GetNormal(const G4ThreeVector &xx,
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G4bool isGlobal = false) ;
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virtual G4int DistanceToSurface(const G4ThreeVector &gp,
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const G4ThreeVector &gv,
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G4ThreeVector gxx[],
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G4double distance[],
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G4int areacode[],
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G4bool isvalid[],
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EValidate validate = kValidateWithTol);
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virtual G4int DistanceToSurface(const G4ThreeVector &gp,
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G4ThreeVector gxx[],
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G4double distance[],
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G4int areacode[]);
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private:
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virtual G4int GetAreaCode(const G4ThreeVector &xx,
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G4bool withTol = true);
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virtual void SetCorners();
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virtual void SetBoundaries();
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void GetPhiUAtX(G4ThreeVector p, G4double &phi, G4double &u);
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G4ThreeVector ProjectPoint(const G4ThreeVector &p,
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G4bool isglobal = false);
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inline G4ThreeVector SurfacePoint(G4double phi, G4double u);
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inline G4ThreeVector NormAng(G4double phi, G4double u);
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inline G4double Xcoef(G4double u); // to calculate the w(u) function
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private:
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G4double fDx1; // Half-length along x of the side at y=-fDy1
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// (d in surface equation)
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G4double fDx2; // Half-length along x of the side at y=+fDy1
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// (a in surface equation)
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G4double fDy; // Half-length along y of the face
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// (b in surface equation)
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G4double fDz; // Half-length along the z axis
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// (L in surface equation)
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G4double fPhiTwist; // twist angle ( dphi in surface equation)
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G4double fAngleSide;
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};
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//========================================================
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// inline functions
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//========================================================
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inline
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G4double G4TwistedTrapSide::Xcoef(G4double u)
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{
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// attention a = 2 fDx1
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// d = 2 fDx2
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// b = 2 fDy
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// L = 2 fDz
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return fDx2 + ( fDx1-fDx2)/2 - u * (fDx1-fDx2)/(2*fDy) ;
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}
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inline
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G4ThreeVector G4TwistedTrapSide::SurfacePoint( G4double phi, G4double u )
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{
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// function to calculate a point on the surface, given by parameters phi,u
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G4ThreeVector SurfPoint ( Xcoef(u) * std::cos(phi) - u * std::sin(phi),
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Xcoef(u) * std::sin(phi) + u * std::cos(phi),
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2*fDz*phi/fPhiTwist );
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return SurfPoint ;
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}
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inline
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G4ThreeVector G4TwistedTrapSide::NormAng( G4double phi, G4double u )
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{
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// function to calculate the norm at a given point on the surface
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G4double L = 2*fDz ;
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G4double a = 2*fDx2 ;
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G4double d = 2*fDx1 ;
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G4double b = 2*fDy ;
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G4double dphi = fPhiTwist ;
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G4double b2 = b*b ;
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G4double d2 = d*d ;
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G4double a2 = a*a ;
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G4ThreeVector nvec( ( L * (2*b*std::cos(phi) + (a-d)*std::sin(phi)))/2.,
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-(L*((a-d)*std::cos(phi) - 2*b*std::sin(phi)))/2.,
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(dphi*(-b*d2 + 8*b2*u - 4*a*d*u + 2*d2*u + a2*(b + 2*u)))
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/(8.*b) ) ;
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return nvec.unit();
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}
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#endif
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