Gabriele Cosmo
137 lines
3.2 KiB
Plaintext
137 lines
3.2 KiB
Plaintext
// This code implementation is the intellectual property of
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// the GEANT4 collaboration.
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//
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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 statement,
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// and all its terms.
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//
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// $Id: G4Parabola.icc,v 1.5 2000/11/08 14:22:03 gcosmo Exp $
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// GEANT4 tag $Name: geant4-03-00 $
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//
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// --------------------------------------------------------------------
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// GEANT 4 inline definitions file
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//
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// G4Parabola.icc
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//
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// Implementation of inline methods of G4Parabola
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// --------------------------------------------------------------------
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inline
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void G4Parabola::Init(const G4Axis2Placement3D& position0,
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G4double focalDist0)
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{
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position= position0;
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focalDist= focalDist0;
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// focus
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F= position.GetLocation()+focalDist*position.GetPX();
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// line
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L0= position.GetLocation()-focalDist*position.GetPX();
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//l= position.GetPY();
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}
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inline
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G4double G4Parabola::GetFocalDist() const
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{
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return focalDist;
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}
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//////////////////////////////////////////////////////////////////////////////
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inline
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G4double G4Parabola::GetPMax() const
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{
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return -1;
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}
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inline
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G4Point3D G4Parabola::GetPoint(G4double param) const
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{
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return G4Point3D( position.GetLocation()
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+ focalDist* (param*param*position.GetPX()
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+ 2*param*position.GetPY()) );
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}
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inline
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G4double G4Parabola::GetPPoint(const G4Point3D& pt) const
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{
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G4Point3D ptLocal= position.GetToPlacementCoordinates()*pt;
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return ptLocal.y()/(2*focalDist);
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}
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//////////////////////////////////////////////////////////////////////////////
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/*
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#include "G4CurveRayIntersection.hh"
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inline
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void G4Parabola::IntersectRay2D(const G4Ray& ray,
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G4CurveRayIntersection& is)
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{
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is.Init(*this, ray);
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const G4Point3D& S= ray.GetStart();
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const G4Vector3D& d= ray.GetDir();
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const G4Vector3D& l= position.GetPY();
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// a == 1
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G4Vector3D SMinusF= S-F;
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G4double bHalf= SMinusF*d - (d.x()*l.y()-d.y()*l.x());
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G4double c= SMinusF.mag2() + ( (S.x()-L0.x())*l.y() - (S.y()-L0.y())*l.x() );
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G4double discr= bHalf*bHalf-c;
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if (discr >= 0) {
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// 2 intersections (maybe 1, but this case is rare)
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G4double sqrtdiscr= sqrt(discr);
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// find the smallest positive i
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G4double i= -bHalf-sqrtdiscr;
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if (i<kCarTolerance) {
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i= -bHalf+sqrtdiscr;
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if (i<kCarTolerance) {
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return;
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}
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}
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G4CurveRayIntersection isTmp(*this, ray);
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isTmp.ResetDistance(i);
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is.Update(isTmp);
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}
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}
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*/
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inline
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G4int G4Parabola::IntersectRay2D(const G4Ray& ray)
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{
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// NOT VERIFIED
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const G4Point3D& S= ray.GetStart();
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const G4Vector3D& d= ray.GetDir();
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const G4Vector3D& l= position.GetPY();
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// a == 1
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G4Vector3D SMinusF= G4Vector3D( S-F );
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G4double bHalf= SMinusF*d - (d.x()*l.y()-d.y()*l.x());
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G4double c= SMinusF.mag2() + ( (S.x()-L0.x())*l.y() - (S.y()-L0.y())*l.x() );
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G4int nbinter = 0;
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G4double discr= bHalf*bHalf-c;
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if (discr >= 0)
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{
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// 2 intersections (maybe 1, but this case is rare)
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G4double sqrtdiscr= sqrt(discr);
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G4double i= -bHalf-sqrtdiscr;
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if (i>kCarTolerance)
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nbinter++;
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i= -bHalf+sqrtdiscr;
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if (i>kCarTolerance)
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nbinter++;
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}
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return nbinter++;
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}
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