SurfaceMaterialMapper.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2018-2020 CERN for the benefit of the Acts project
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#pragma once

#include "Acts/Geometry/GeometryContext.hpp"
#include "Acts/Geometry/GeometryID.hpp"
#include "Acts/MagneticField/MagneticFieldContext.hpp"
#include "Acts/Material/AccumulatedSurfaceMaterial.hpp"
#include "Acts/Material/ISurfaceMaterial.hpp"
#include "Acts/Propagator/MaterialInteractor.hpp"
#include "Acts/Propagator/Navigator.hpp"
#include "Acts/Propagator/Propagator.hpp"
#include "Acts/Propagator/StraightLineStepper.hpp"
#include "Acts/Propagator/SurfaceCollector.hpp"
#include "Acts/Propagator/VolumeCollector.hpp"
#include "Acts/Surfaces/Surface.hpp"
#include "Acts/Utilities/Logger.hpp"

namespace Acts {

class TrackingGeometry;

struct MaterialSurface {
  bool operator()(const Surface& sf) const {
    return (sf.surfaceMaterial() != nullptr);
  }
};

struct MaterialVolume {
  bool operator()(const TrackingVolume& vf) const {
    return (vf.volumeMaterial() != nullptr);
  }
};

class SurfaceMaterialMapper {
 public:
  using StraightLinePropagator = Propagator<StraightLineStepper, Navigator>;

  struct Config {
    std::array<double, 2> etaRange = {{-6., 6.}};
    bool emptyBinCorrection = true;
    bool mapperDebugOutput = false;
  };

  struct State {
    State(std::reference_wrapper<const GeometryContext> gctx,
          std::reference_wrapper<const MagneticFieldContext> mctx)
        : geoContext(gctx), magFieldContext(mctx) {}

    std::map<GeometryID, AccumulatedSurfaceMaterial> accumulatedMaterial;

    std::map<GeometryID, std::unique_ptr<const ISurfaceMaterial>>
        surfaceMaterial;

    std::reference_wrapper<const GeometryContext> geoContext;

    std::reference_wrapper<const MagneticFieldContext> magFieldContext;
  };

  SurfaceMaterialMapper() = delete;

  SurfaceMaterialMapper(const Config& cfg, StraightLinePropagator propagator,
                        std::unique_ptr<const Logger> slogger =
                            getDefaultLogger("SurfaceMaterialMapper",
                                             Logging::INFO));

  State createState(const GeometryContext& gctx,
                    const MagneticFieldContext& mctx,
                    const TrackingGeometry& tGeometry) const;

  void finalizeMaps(State& mState) const;

  void mapMaterialTrack(State& mState, RecordedMaterialTrack& mTrack) const;

 private:
  void resolveMaterialSurfaces(State& mState,
                               const TrackingVolume& tVolume) const;

  void checkAndInsert(State& /*mState*/, const Surface& surface) const;

  const Logger& logger() const { return *m_logger; }

  Config m_cfg;

  StraightLinePropagator m_propagator;

  std::unique_ptr<const Logger> m_logger;
};
}  // namespace Acts