EllipseBounds.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/Surfaces/PlanarBounds.hpp"
#include "Acts/Surfaces/RectangleBounds.hpp"
#include "Acts/Utilities/Definitions.hpp"
#include "Acts/Utilities/detail/periodic.hpp"

#include <array>
#include <cmath>
#include <cstdlib>
#include <exception>
#include <vector>

namespace Acts {

class EllipseBounds : public PlanarBounds {
 public:
  enum BoundValues {
    eInnerRx = 0,
    eInnerRy = 1,
    eOuterRx = 2,
    eOuterRy = 3,
    eHalfPhiSector = 4,
    eAveragePhi = 5,
    eSize = 6
  };

  EllipseBounds() = delete;

  EllipseBounds(double innerRx, double innerRy, double outerRx, double outerRy,
                double halfPhi = M_PI, double averagePhi = 0.) noexcept(false)
      : m_values({innerRx, innerRy, outerRx, outerRy, halfPhi, averagePhi}),
        m_boundingBox(m_values[eInnerRy], m_values[eOuterRy]) {
    checkConsistency();
  }

  EllipseBounds(const std::array<double, eSize>& values) noexcept(false)
      : m_values(values), m_boundingBox(values[eInnerRy], values[eOuterRy]) {
    checkConsistency();
  }

  ~EllipseBounds() override = default;

  BoundsType type() const final;

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

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

  double distanceToBoundary(const Vector2D& lposition) const final;

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

  // Bounding box representation
  const RectangleBounds& boundingBox() const final;

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

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

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

  void checkConsistency() noexcept(false);
};

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

inline void EllipseBounds::checkConsistency() noexcept(false) {
  if (get(eInnerRx) >= get(eOuterRx) or get(eInnerRx) < 0. or
      get(eOuterRx) <= 0.) {
    throw std::invalid_argument("EllipseBounds: invalid along x axis");
  }
  if (get(eInnerRy) >= get(eOuterRy) or get(eInnerRy) < 0. or
      get(eOuterRy) <= 0.) {
    throw std::invalid_argument("EllipseBounds: invalid along y axis.");
  }
  if (get(eHalfPhiSector) < 0. or get(eHalfPhiSector) > M_PI) {
    throw std::invalid_argument("EllipseBounds: invalid phi sector setup.");
  }
  if (get(eAveragePhi) != detail::radian_sym(get(eAveragePhi))) {
    throw std::invalid_argument("EllipseBounds: invalid phi positioning.");
  }
}

}  // namespace Acts