DoubleHitSpacePointBuilder.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2018-2019 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/Geometry/GeometryContext.hpp"
#include "Acts/Plugins/Digitization/CartesianSegmentation.hpp"
#include "Acts/Plugins/Digitization/SpacePointBuilder.hpp"
#include "Acts/Utilities/Units.hpp"

namespace Acts {

struct DoubleHitSpacePointConfig {
  double diffTheta2 = 1.;
  double diffPhi2 = 1.;
  double diffDist = 100. * UnitConstants::mm;
  double stripLengthTolerance = 0.01;
  double stripLengthGapTolerance = 0.01;
  Vector3D vertex = {0., 0., 0.};
  bool usePerpProj = false;
};

template <typename Cluster>
class SpacePointBuilder<SpacePoint<Cluster>> {
 public:
  SpacePointBuilder(DoubleHitSpacePointConfig cfg);

  void makeClusterPairs(const GeometryContext& gctx,
                        const std::vector<const Cluster*>& clustersFront,
                        const std::vector<const Cluster*>& clustersBack,
                        std::vector<std::pair<const Cluster*, const Cluster*>>&
                            clusterPairs) const;

  void calculateSpacePoints(
      const GeometryContext& gctx,
      const std::vector<std::pair<const Cluster*, const Cluster*>>&
          clusterPairs,
      std::vector<SpacePoint<Cluster>>& spacePoints) const;

 private:
  DoubleHitSpacePointConfig m_cfg;

  Vector2D localCoords(const Cluster& cluster) const;

  Vector3D globalCoords(const GeometryContext& gctx,
                        const Cluster& cluster) const;

  std::pair<Vector3D, Vector3D> endsOfStrip(const GeometryContext& gctx,
                                            const Cluster& cluster) const;
};
}  // namespace Acts
#include "Acts/Plugins/Digitization/detail/DoubleHitSpacePointBuilder.ipp"