DiscTrapezoidBounds.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2016-2020 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 <cmath>

#include "Acts/Surfaces/DiscBounds.hpp"
#include "Acts/Utilities/Definitions.hpp"
#include "Acts/Utilities/ParameterDefinitions.hpp"
#include "Acts/Utilities/detail/periodic.hpp"

#include <array>
#include <vector>

namespace Acts {


class DiscTrapezoidBounds : public DiscBounds {
 public:
  enum BoundValues : int {
    eHalfLengthXminR = 0,
    eHalfLengthXmaxR = 1,
    eMinR = 2,
    eMaxR = 3,
    eAveragePhi = 4,
    eStereo = 5,
    eSize = 6
  };

  DiscTrapezoidBounds() = delete;

  DiscTrapezoidBounds(double halfXminR, double halfXmaxR, double minR,
                      double maxR, double avgPhi = M_PI_2,
                      double stereo = 0.) noexcept(false);

  DiscTrapezoidBounds(const std::array<double, eSize>& values) noexcept(false)
      : m_values(values) {
    checkConsistency();
  }

  ~DiscTrapezoidBounds() override = default;

  SurfaceBounds::BoundsType type() const final;

  std::vector<double> values() const final;

  bool inside(const Vector2D& lposition,
              const BoundaryCheck& bcheck = true) const final;

  double distanceToBoundary(const Vector2D& lposition) const final;

  std::ostream& toStream(std::ostream& sl) const final;

  double get(BoundValues bValue) const { return m_values[bValue]; }

  double rMin() const final;

  double rMax() const final;

  double rCenter() const;

  double stereo() const;

  double halfPhiSector() const;

  double halfLengthY() const;

  bool coversFullAzimuth() const final;

  bool insideRadialBounds(double R, double tolerance = 0.) const final;

  double binningValueR() const final;

  double binningValuePhi() const final;

  std::vector<Vector2D> vertices(unsigned int lseg) const;

 private:
  std::array<double, eSize> m_values;

  void checkConsistency() noexcept(false);

  Vector2D toLocalCartesian(const Vector2D& lposition) const;

  ActsMatrixD<2, 2> jacobianToLocalCartesian(const Vector2D& lposition) const;
};

inline double DiscTrapezoidBounds::rMin() const {
  return get(eMinR);
}

inline double DiscTrapezoidBounds::rMax() const {
  return get(eMaxR);
}

inline double DiscTrapezoidBounds::stereo() const {
  return get(eStereo);
}

inline double DiscTrapezoidBounds::halfPhiSector() const {
  auto minHalfPhi = std::asin(get(eHalfLengthXminR) / get(eMinR));
  auto maxHalfPhi = std::asin(get(eHalfLengthXmaxR) / get(eMaxR));
  return std::max(minHalfPhi, maxHalfPhi);
}

inline double DiscTrapezoidBounds::rCenter() const {
  double rmin = get(eMinR);
  double rmax = get(eMaxR);
  double hxmin = get(eHalfLengthXminR);
  double hxmax = get(eHalfLengthXmaxR);
  auto hmin = std::sqrt(rmin * rmin - hxmin * hxmin);
  auto hmax = std::sqrt(rmax * rmax - hxmax * hxmax);
  return 0.5 * (hmin + hmax);
}

inline double DiscTrapezoidBounds::halfLengthY() const {
  double rmin = get(eMinR);
  double rmax = get(eMaxR);
  double hxmin = get(eHalfLengthXminR);
  double hxmax = get(eHalfLengthXmaxR);
  auto hmin = std::sqrt(rmin * rmin - hxmin * hxmin);
  auto hmax = std::sqrt(rmax * rmax - hxmax * hxmax);
  return 0.5 * (hmax - hmin);
}

inline bool DiscTrapezoidBounds::coversFullAzimuth() const {
  return false;
}

inline bool DiscTrapezoidBounds::insideRadialBounds(double R,
                                                    double tolerance) const {
  return (R + tolerance > get(eMinR) and R - tolerance < get(eMaxR));
}

inline double DiscTrapezoidBounds::binningValueR() const {
  return 0.5 * (get(eMinR) + get(eMaxR));
}

inline double DiscTrapezoidBounds::binningValuePhi() const {
  return get(eAveragePhi);
}

inline std::vector<double> DiscTrapezoidBounds::values() const {
  std::vector<double> valvector;
  valvector.insert(valvector.begin(), m_values.begin(), m_values.end());
  return valvector;
}

inline void DiscTrapezoidBounds::checkConsistency() noexcept(false) {
  if (get(eMinR) < 0. or get(eMaxR) <= 0. or get(eMinR) > get(eMaxR)) {
    throw std::invalid_argument("DiscTrapezoidBounds: invalid radial setup.");
  }
  if (get(eHalfLengthXminR) < 0. or get(eHalfLengthXmaxR) <= 0.) {
    throw std::invalid_argument("DiscTrapezoidBounds: negative length given.");
  }
  if (get(eAveragePhi) != detail::radian_sym(get(eAveragePhi))) {
    throw std::invalid_argument(
        "DiscTrapezoidBounds: invalid phi positioning.");
  }
}

}  // namespace Acts