Gabriele Cosmo
228 lines
7.5 KiB
C++
228 lines
7.5 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: G4ErrorCylSurfaceTarget.cc 66356 2012-12-18 09:02:32Z gcosmo $
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//
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//
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// --------------------------------------------------------------------
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// GEANT 4 class implementation file
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// --------------------------------------------------------------------
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#include "G4ErrorCylSurfaceTarget.hh"
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#include "G4GeometryTolerance.hh"
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#ifdef G4VERBOSE
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#include "G4ErrorPropagatorData.hh" //for verbosity checking
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#endif
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#include "geomdefs.hh"
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#include "G4Plane3D.hh"
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//---------------------------------------------------------------------
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G4ErrorCylSurfaceTarget::
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G4ErrorCylSurfaceTarget( const G4double& radius,
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const G4ThreeVector& trans,
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const G4RotationMatrix& rotm )
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: fradius(radius)
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{
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theType = G4ErrorTarget_CylindricalSurface;
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ftransform = G4AffineTransform( rotm.inverse(), -trans );
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#ifdef G4VERBOSE
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if(G4ErrorPropagatorData::verbose() >= 2 ) {
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Dump( " $$$ creating G4ErrorCylSurfaceTarget ");
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}
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#endif
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}
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//---------------------------------------------------------------------
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G4ErrorCylSurfaceTarget::
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G4ErrorCylSurfaceTarget( const G4double& radius,
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const G4AffineTransform& trans )
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: fradius(radius), ftransform(trans.Inverse())
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{
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theType = G4ErrorTarget_CylindricalSurface;
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#ifdef G4VERBOSE
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if(G4ErrorPropagatorData::verbose() >= 2 )
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{
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Dump( " $$$ creating G4ErrorCylSurfaceTarget ");
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}
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#endif
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}
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//---------------------------------------------------------------------
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G4ErrorCylSurfaceTarget::~G4ErrorCylSurfaceTarget()
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{
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}
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//---------------------------------------------------------------------
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G4double G4ErrorCylSurfaceTarget::
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GetDistanceFromPoint( const G4ThreeVector& point,
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const G4ThreeVector& dir ) const
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{
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if( dir.mag() == 0. )
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{
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G4Exception("G4ErrorCylSurfaceTarget::GetDistanceFromPoint()",
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"GeomMgt0003", FatalException, "Direction is zero !");
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}
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//----- Get intersection point
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G4ThreeVector localPoint = ftransform.TransformPoint( point );
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G4ThreeVector localDir = ftransform.TransformAxis( dir );
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G4ThreeVector inters = IntersectLocal(localPoint, localDir);
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G4double dist = (localPoint-inters).mag();
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#ifdef G4VERBOSE
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if(G4ErrorPropagatorData::verbose() >= 3 )
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{
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G4cout << " G4ErrorCylSurfaceTarget::GetDistanceFromPoint():" << G4endl
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<< " Global point " << point << " dir " << dir << G4endl
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<< " Intersection " << inters << G4endl
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<< " Distance " << dist << G4endl;
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Dump( " CylSurface: " );
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}
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#endif
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return dist;
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}
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//---------------------------------------------------------------------
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G4double G4ErrorCylSurfaceTarget::
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GetDistanceFromPoint( const G4ThreeVector& point ) const
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{
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G4ThreeVector localPoint = ftransform.TransformPoint( point );
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#ifdef G4VERBOSE
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if(G4ErrorPropagatorData::verbose() >= 3 )
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{
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G4cout << " G4ErrorCylSurfaceTarget::GetDistanceFromPoint:" << G4endl
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<< " Global point " << point << G4endl
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<< " Distance " << fradius - localPoint.perp() << G4endl;
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Dump( " CylSurface: " );
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}
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#endif
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return fradius - localPoint.perp();
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}
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//---------------------------------------------------------------------
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G4ThreeVector G4ErrorCylSurfaceTarget::
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IntersectLocal( const G4ThreeVector& localPoint,
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const G4ThreeVector& localDir ) const
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{
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G4double eqa = localDir.x()*localDir.x()+localDir.y()*localDir.y();
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G4double eqb = 2*(localPoint.x()*localDir.x()+localPoint.y()*localDir.y());
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G4double eqc = -fradius*fradius+localPoint.x()*localPoint.x()
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+localPoint.y()*localPoint.y();
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G4int inside = (localPoint.perp() > fradius) ? -1 : 1;
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G4double lambda;
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if( eqa*inside > 0. )
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{
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lambda = (-eqb + std::sqrt(eqb*eqb-4*eqa*eqc) ) / (2.*eqa);
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}
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else if( eqa*inside < 0. )
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{
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lambda = (-eqb - std::sqrt(eqb*eqb-4*eqa*eqc) ) / (2.*eqa);
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}
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else
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{
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if( eqb != 0. )
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{
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lambda = -eqc/eqb;
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}
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else
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{
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std::ostringstream message;
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message << "Intersection not possible !" << G4endl
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<< " Point: " << localPoint << ", direction: "
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<< localDir;
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Dump( " CylSurface: " );
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G4Exception("G4ErrorCylSurfaceTarget::IntersectLocal()",
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"GeomMgt1002", JustWarning, message);
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lambda = kInfinity;
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}
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}
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G4ThreeVector inters = localPoint + lambda*localDir/localDir.mag();
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#ifdef G4VERBOSE
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if(G4ErrorPropagatorData::verbose() >= 4 ) {
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G4cout << " G4ErrorCylSurfaceTarget::IntersectLocal " << inters << " "
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<< inters.perp() << " localPoint " << localPoint << " localDir "
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<< localDir << G4endl;
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}
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#endif
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return inters;
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}
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//---------------------------------------------------------------------
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G4Plane3D G4ErrorCylSurfaceTarget::
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GetTangentPlane( const G4ThreeVector& point ) const
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{
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G4ThreeVector localPoint = ftransform.TransformPoint( point );
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// check that point is at cylinder surface
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//
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if( std::fabs( localPoint.perp() - fradius )
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> 1000.*G4GeometryTolerance::GetInstance()->GetSurfaceTolerance() )
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{
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std::ostringstream message;
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message << "Local point not at surface !" << G4endl
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<< " Point: " << point << ", local: " << localPoint
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<< G4endl
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<< " is not at surface, but far away by: "
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<< localPoint.perp() - fradius << " !";
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G4Exception("G4ErrorCylSurfaceTarget::GetTangentPlane()",
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"GeomMgt1002", JustWarning, message);
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}
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G4Normal3D normal = localPoint - ftransform.NetTranslation();
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return G4Plane3D( normal, point );
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}
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//---------------------------------------------------------------------
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void G4ErrorCylSurfaceTarget::Dump( const G4String& msg ) const
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{
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G4cout << msg << " radius " << fradius
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<< " centre " << ftransform.NetTranslation()
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<< " rotation " << ftransform.NetRotation() << G4endl;
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}
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