IntersectionHelper2D.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 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/Utilities/Intersection.hpp"

#include <array>

namespace Acts {
namespace detail {

struct IntersectionHelper2D {
  static Intersection2D intersectSegment(const Vector2& s0, const Vector2& s1,
                                         const Vector2& origin,
                                         const Vector2& dir,
                                         bool boundCheck = false);

  static std::array<Intersection2D, 2> intersectEllipse(ActsScalar Rx,
                                                        ActsScalar Ry,
                                                        const Vector2& origin,
                                                        const Vector2& dir);

  static inline std::array<Intersection2D, 2> intersectCircle(
      ActsScalar R, const Vector2& origin, const Vector2& dir) {
    return intersectEllipse(R, R, origin, dir);
  }

  static Intersection2D intersectCircleSegment(ActsScalar R, ActsScalar phiMin,
                                               ActsScalar phiMax,
                                               const Vector2& origin,
                                               const Vector2& dir);

};  // struct IntersectionHelper2D

}  // namespace detail
}  // namespace Acts