VertexFitterAlgorithm.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2016-2019 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/Definitions/Algebra.hpp"
#include "Acts/Definitions/Direction.hpp"
#include "Acts/Definitions/Units.hpp"
#include "Acts/EventData/TrackParameters.hpp"
#include "Acts/Geometry/GeometryIdentifier.hpp"
#include "Acts/MagneticField/MagneticFieldProvider.hpp"
#include "Acts/Propagator/EigenStepper.hpp"
#include "Acts/Propagator/Propagator.hpp"
#include "Acts/Utilities/Logger.hpp"
#include "Acts/Vertexing/FullBilloirVertexFitter.hpp"
#include "Acts/Vertexing/HelicalTrackLinearizer.hpp"
#include "Acts/Vertexing/Vertex.hpp"
#include "Acts/Vertexing/VertexingOptions.hpp"
#include "ActsExamples/EventData/ProtoVertex.hpp"
#include "ActsExamples/EventData/Track.hpp"
#include "ActsExamples/EventData/Trajectories.hpp"
#include "ActsExamples/Framework/DataHandle.hpp"
#include "ActsExamples/Framework/IAlgorithm.hpp"
#include "ActsExamples/Framework/ProcessCode.hpp"

#include <algorithm>
#include <array>
#include <memory>
#include <string>
#include <tuple>
#include <utility>
#include <vector>

namespace Acts {
class MagneticFieldProvider;
}  // namespace Acts

namespace ActsExamples {
struct AlgorithmContext;

class VertexFitterAlgorithm final : public IAlgorithm {
 public:
  using Propagator = Acts::Propagator<Acts::EigenStepper<>>;
  using PropagatorOptions = Acts::PropagatorOptions<>;
  using Linearizer = Acts::HelicalTrackLinearizer<Propagator>;
  using VertexFitter =
      Acts::FullBilloirVertexFitter<Acts::BoundTrackParameters, Linearizer>;
  using VertexFitterOptions =
      Acts::VertexingOptions<Acts::BoundTrackParameters>;

  using VertexCollection =
      std::vector<Acts::Vertex<Acts::BoundTrackParameters>>;

  struct Config {
    std::string inputTrackParameters;
    std::string inputTrajectories;
    std::string inputProtoVertices;
    std::string outputVertices;
    std::shared_ptr<Acts::MagneticFieldProvider> bField;
    bool doConstrainedFit = false;
    Acts::Vector4 constraintPos = Acts::Vector4(0, 0, 0, 0);
    Acts::SquareMatrix4 constraintCov =
        Acts::Vector4(3 * Acts::UnitConstants::mm * Acts::UnitConstants::mm,
                      3 * Acts::UnitConstants::mm * Acts::UnitConstants::mm,
                      10 * Acts::UnitConstants::mm * Acts::UnitConstants::mm,
                      1 * Acts::UnitConstants::ns * Acts::UnitConstants::ns)
            .asDiagonal();
  };

  VertexFitterAlgorithm(const Config& cfg, Acts::Logging::Level lvl);

  ProcessCode execute(const AlgorithmContext& ctx) const final;

  const Config& config() const { return m_cfg; }

 private:
  Config m_cfg;

  ReadDataHandle<std::vector<Acts::BoundTrackParameters>>
      m_inputTrackParameters{this, "InputTrackParameters"};

  ReadDataHandle<TrajectoriesContainer> m_inputTrajectories{
      this, "InputTrajectories"};

  ReadDataHandle<ProtoVertexContainer> m_inputProtoVertices{
      this, "InputProtoVertices"};

  WriteDataHandle<VertexCollection> m_outputVertices{this, "OutputVertices"};
};

}  // namespace ActsExamples