ConeBounds.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 "Acts/Definitions/Algebra.hpp"
#include "Acts/Definitions/Tolerance.hpp"
#include "Acts/Surfaces/BoundaryCheck.hpp"
#include "Acts/Surfaces/SurfaceBounds.hpp"
#include "Acts/Utilities/detail/periodic.hpp"

#include <array>
#include <cmath>
#include <cstdlib>
#include <iosfwd>
#include <stdexcept>
#include <vector>

namespace Acts {


class ConeBounds : public SurfaceBounds {
 public:
  enum BoundValues : int {
    eAlpha = 0,
    eMinZ = 1,
    eMaxZ = 2,
    eHalfPhiSector = 3,
    eAveragePhi = 4,
    eSize = 5
  };

  ConeBounds() = delete;

  ConeBounds(double alpha, bool symm, double halfphi = M_PI,
             double avphi = 0.) noexcept(false);

  ConeBounds(double alpha, double minz, double maxz, double halfphi = M_PI,
             double avphi = 0.) noexcept(false);

  ConeBounds(const std::array<double, eSize>& values) noexcept(false);

  ~ConeBounds() override = default;

  BoundsType type() const final;

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

  bool inside(const Vector2& lposition,
              const BoundaryCheck& bcheck = true) const final;

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

  double r(double z) const;

  double tanAlpha() const;

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

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

  void checkConsistency() noexcept(false);

  Vector2 shifted(const Vector2& lposition) const;
};

inline double ConeBounds::r(double z) const {
  return std::abs(z * m_tanAlpha);
}

inline double ConeBounds::tanAlpha() const {
  return m_tanAlpha;
}

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

inline void ConeBounds::checkConsistency() noexcept(false) {
  if (get(eAlpha) < 0. or get(eAlpha) >= M_PI) {
    throw std::invalid_argument("ConeBounds: invalid open angle.");
  }
  if (get(eMinZ) > get(eMaxZ) or
      std::abs(get(eMinZ) - get(eMaxZ)) < s_epsilon) {
    throw std::invalid_argument("ConeBounds: invalid z range setup.");
  }
  if (get(eHalfPhiSector) < 0. or abs(eHalfPhiSector) > M_PI) {
    throw std::invalid_argument("ConeBounds: invalid phi sector setup.");
  }
  if (get(eAveragePhi) != detail::radian_sym(get(eAveragePhi))) {
    throw std::invalid_argument("ConeBounds: invalid phi positioning.");
  }
}

}  // namespace Acts