Gabriele Cosmo
63 lines
1.8 KiB
C++
63 lines
1.8 KiB
C++
// -*- C++ -*-
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// ---------------------------------------------------------------------------
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//
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// This file is a part of the CLHEP - a Class Library for High Energy Physics.
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//
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// This is the implementation of methods of the HepRotation class which
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// were introduced when ZOOM PhysicsVectors was merged in, which might cause
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// pulling in of LorentzTransformation related code units.
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//
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#ifdef GNUPRAGMA
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#pragma implementation
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#endif
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#include "CLHEP/Vector/Rotation.h"
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#include "CLHEP/Vector/LorentzRotation.h"
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#include <cmath>
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namespace CLHEP {
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// ---------- distance2 and related member functions:
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//
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// WHy do we have forms for HepLorentzRotation and HepBoost but not for
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// HepBoostX, HepBoostY, HepBoostZ? Because the latter can be gotten by
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// implicit conversion to HepBoost; but if we just had HepLorentzRotation
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// then this would involve double conversion when HepBoostX was used.
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double HepRotation::distance2( const HepLorentzRotation & lt ) const {
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HepAxisAngle a;
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Hep3Vector b;
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lt.decompose(b, a);
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double bet = b.beta();
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double bet2 = bet*bet;
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HepRotation r(a);
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return bet2/(1-bet2) + distance2(r);
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}
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double HepRotation::distance2( const HepBoost & lt ) const {
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return distance2( HepLorentzRotation(lt));
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}
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double HepRotation::howNear( const HepLorentzRotation & lt ) const {
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return std::sqrt( distance2( lt ) );
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}
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double HepRotation::howNear( const HepBoost & lt ) const {
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return std::sqrt( distance2( lt ) );
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}
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bool HepRotation::isNear( const HepLorentzRotation & lt,
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double epsilon) const {
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return distance2( lt ) <= epsilon*epsilon;
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}
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bool HepRotation::isNear( const HepBoost & lt,
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double epsilon) const {
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return distance2( lt ) <= epsilon*epsilon;
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}
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} // namespace CLHEP
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