IExtrapolationTool.h

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef ACTSGEOMETRYINTERFACES_ActsTrkIExtrapolationTool_H
#define ACTSGEOMETRYINTERFACES_ActsTrkIExtrapolationTool_H
 
#include "AthenaBaseComps/AthAlgTool.h"
#include "GaudiKernel/IInterface.h"
#include "GaudiKernel/IAlgTool.h"
#include "GaudiKernel/EventContext.h"
#include "TrkEventPrimitives/ParticleHypothesis.h"
 
#include "ActsGeometryInterfaces/GeometryContext.h"
#include "Acts/MagneticField/MagneticFieldContext.hpp"
 
#include "Acts/Propagator/MaterialInteractor.hpp"
#include "Acts/Propagator/detail/SteppingLogger.hpp"
#include "Acts/EventData/TrackParameters.hpp"
 
 
namespace ActsTrk {
  class IExtrapolationTool : virtual public IAlgTool {
    public:
      DeclareInterfaceID(ActsTrk::IExtrapolationTool, 1, 0);
      using RecordedMaterial = Acts::MaterialInteractor::result_type;
      using PropagationOutput = std::pair<std::vector<Acts::detail::Step>, 
                                          RecordedMaterial>;
      virtual PropagationOutput propagationSteps(const EventContext& ctx,
                       const Acts::BoundTrackParameters& startParameters,
                       Acts::Direction navDir = Acts::Direction::Forward(),
                       double pathLimit = std::numeric_limits<double>::max()) const = 0;
      virtual PropagationOutput propagationSteps(const EventContext& ctx,
                                                 const Acts::BoundTrackParameters& startParameters,
                                                 const Acts::Surface& target,
                                                 Acts::Direction navDir = Acts::Direction::Forward(),
                                                 double pathLimit = std::numeric_limits<double>::max()) const = 0;
      virtual std::optional<Acts::BoundTrackParameters> propagate(const EventContext& ctx,
                                                                  const Acts::BoundTrackParameters& startParameters,
                                                                  const Acts::Surface& target,
                                                                  Acts::Direction navDir = Acts::Direction::Forward(),
                                                                  double pathLimit = std::numeric_limits<double>::max()) const = 0;
      virtual std::optional<Acts::BoundTrackParameters> propagate(const EventContext& ctx,
                                                                  const Acts::BoundTrackParameters& startParameters,
                                                                  Acts::Direction navDir = Acts::Direction::Forward(),
                                                                  double pathLimit = std::numeric_limits<double>::max()) const = 0;
      virtual Acts::MagneticFieldContext getMagneticFieldContext(const EventContext& ctx) const = 0;
  };
 
}
 
#endif