DiamondBounds.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/ParameterDefinitions.hpp"

#include <algorithm>
#include <array>
#include <cmath>
#include <vector>

namespace Acts {

class DiamondBounds : public PlanarBounds {
 public:
  enum BoundValues {
    eHalfLengthXnegY = 0,
    eHalfLengthXzeroY = 1,
    eHalfLengthXposY = 2,
    eHalfLengthYneg = 3,
    eHalfLengthYpos = 4,
    eSize = 5
  };

  DiamondBounds() = delete;

  DiamondBounds(double halfXnegY, double halfXzeroY, double halfXposY,
                double halfYneg, double halfYpos) noexcept(false)
      : m_values({halfXnegY, halfXzeroY, halfXposY, halfYneg, halfYpos}),
        m_boundingBox(
            Vector2D{
                -(*std::max_element(m_values.begin(), m_values.begin() + 2)),
                -halfYneg},
            Vector2D{*std::max_element(m_values.begin(), m_values.begin() + 2),
                     halfYpos}) {
    checkConsistency();
  }

  DiamondBounds(const std::array<double, eSize>& values) noexcept(false)
      : m_values(values),
        m_boundingBox(
            Vector2D{-(*std::max_element(values.begin(), values.begin() + 2)),
                     -values[eHalfLengthYneg]},
            Vector2D{*std::max_element(values.begin(), values.begin() + 2),
                     values[eHalfLengthYpos]}) {}

  ~DiamondBounds() 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 = 1) 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> DiamondBounds::values() const {
  std::vector<double> valvector;
  valvector.insert(valvector.begin(), m_values.begin(), m_values.end());
  return valvector;
}

inline void DiamondBounds::checkConsistency() noexcept(false) {
  if (std::any_of(m_values.begin(), m_values.end(),
                  [](auto v) { return v <= 0.; })) {
    throw std::invalid_argument("DiamondBounds: negative half length.");
  }
  if (get(eHalfLengthXnegY) > get(eHalfLengthXzeroY) or
      get(eHalfLengthXposY) > get(eHalfLengthXzeroY)) {
    throw std::invalid_argument("DiamondBounds: not a diamond shape.");
  }
}

}  // namespace Acts