GeometryObjectSorter.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2016-2018 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

// clang-format off
// Workaround for building on clang+libstdc++. Must always be first
#include "Acts/Utilities/detail/ReferenceWrapperAnyCompat.hpp"
// clang-format on

#include "Acts/Definitions/Algebra.hpp"
#include "Acts/Geometry/GeometryContext.hpp"
#include "Acts/Utilities/VectorHelpers.hpp"

#include <functional>
#include <memory>

namespace Acts {

template <class T>
class ObjectSorterT {
 public:
  ObjectSorterT(BinningValue bValue) : m_binningValue(bValue) {}

  bool operator()(T one, T two) const {
    using Acts::VectorHelpers::eta;
    using Acts::VectorHelpers::perp;
    using Acts::VectorHelpers::phi;
    // switch the binning value
    // - binX, binY, binZ, binR, binPhi, binRPhi, binH, binEta
    switch (m_binningValue) {
      // compare on x
      case binX: {
        return one.x() < two.x();
      }
      // compare on y
      case binY: {
        return one.y() < two.y();
      }
      // compare on z
      case binZ: {
        return one.z() < two.z();
      }
      // compare on r
      case binR: {
        return perp(one) < perp(two);
      }
      // compare on phi
      case binPhi: {
        return phi(one) < phi(two);
      }
      // compare on eta
      case binEta: {
        return eta(one) < eta(two);
      }
      // default for the moment
      default: {
        return one.norm() < two.norm();
      }
    }
  }

  BinningValue binningValue() const { return m_binningValue; }

 private:
  BinningValue m_binningValue;  
};

template <class T>
class DistanceSorterT {
 public:
  DistanceSorterT(BinningValue bValue, Vector3 reference)
      : m_binningValue(bValue),
        m_reference(reference),
        m_refR(VectorHelpers::perp(reference)),
        m_refPhi(VectorHelpers::phi(reference)),
        m_refEta(VectorHelpers::eta(reference)) {}

  bool operator()(T one, T two) const {
    using Acts::VectorHelpers::eta;
    using Acts::VectorHelpers::perp;
    using Acts::VectorHelpers::phi;
    // switch the binning value
    // - binX, binY, binZ, binR, binPhi, binRPhi, binH, binEta
    switch (m_binningValue) {
      // compare on diff x
      case binX: {
        double diffOneX = one.x() - m_reference.x();
        double diffTwoX = two.x() - m_reference.x();
        return std::abs(diffOneX) < std::abs(diffTwoX);
      }
      // compare on diff y
      case binY: {
        double diffOneY = one.y() - m_reference.y();
        double diffTwoY = two.y() - m_reference.y();
        return std::abs(diffOneY) < std::abs(diffTwoY);
      }
      // compare on diff z
      case binZ: {
        double diffOneZ = one.z() - m_reference.z();
        double diffTwoZ = two.z() - m_reference.z();
        return std::abs(diffOneZ) < std::abs(diffTwoZ);
      }
      // compare on r
      case binR: {
        double diffOneR = perp(one) - m_refR;
        double diffTwoR = perp(two) - m_refR;
        return std::abs(diffOneR) < std::abs(diffTwoR);
      }
      // compare on phi /// @todo add cyclic value
      case binPhi: {
        double diffOnePhi = phi(one) - m_refPhi;
        double diffTwoPhi = phi(two) - m_refPhi;
        return std::abs(diffOnePhi) < std::abs(diffTwoPhi);
      }
      // compare on eta
      case binEta: {
        double diffOneEta = eta(one) - m_refEta;
        double diffTwoEta = eta(two) - m_refEta;
        return std::abs(diffOneEta) < std::abs(diffTwoEta);
      }
      // default for the moment
      default: {
        T diffOne(one - m_reference);
        T diffTwo(two - m_reference);
        return diffOne.mag2() < diffTwo.mag2();
      }
    }
  }

 private:
  BinningValue m_binningValue;  
  T m_reference;
  double m_refR;
  double m_refPhi;
  double m_refEta;
};

template <class T>
class GeometryObjectSorterT {
 public:
  GeometryObjectSorterT(const GeometryContext& gctx, BinningValue bValue,
                        std::shared_ptr<const Transform3> transform = nullptr)
      : m_context(gctx),
        m_objectSorter(bValue),
        m_transform(std::move(transform)) {}

  bool operator()(T one, T two) const {
    // get the pos one / pos two
    Vector3 posOne =
        m_transform
            ? m_transform->inverse() *
                  one->binningPosition(m_context, m_objectSorter.binningValue())
            : one->binningPosition(m_context, m_objectSorter.binningValue());
    Vector3 posTwo =
        m_transform
            ? m_transform->inverse() *
                  two->binningPosition(m_context, m_objectSorter.binningValue())
            : two->binningPosition(m_context, m_objectSorter.binningValue());
    // now call the distance sorter
    return m_objectSorter.operator()(posOne, posTwo);
  }

 protected:
  std::reference_wrapper<const GeometryContext> m_context;
  ObjectSorterT<Vector3> m_objectSorter;
  std::shared_ptr<const Transform3> m_transform;
};
}  // namespace Acts