NavigationState.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2021 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/Geometry/GeometryContext.hpp"
#include "Acts/Surfaces/BoundaryCheck.hpp"
#include "Acts/Utilities/Delegate.hpp"
#include "Acts/Utilities/Intersection.hpp"

#include <any>
#include <vector>

namespace Acts {

class Surface;

namespace Experimental {

class Portal;
class Detector;
class DetectorVolume;

struct NavigationState {
  struct SurfaceCandidate {
    ObjectIntersection<Surface> objectIntersection;
    const Surface* surface = nullptr;
    const Portal* portal = nullptr;
    BoundaryCheck boundaryCheck = true;
  };

  using SurfaceCandidates = std::vector<SurfaceCandidate>;

  Vector3 position = Vector3(0., 0., 0.);

  Vector3 direction = Vector3(0., 0., 0.);

  ActsScalar absMomentum = 0.;

  ActsScalar absCharge = 0.;

  Vector3 magneticField = Vector3(0., 0., 0.);

  const Detector* currentDetector = nullptr;

  const DetectorVolume* currentVolume = nullptr;

  const Surface* currentSurface = nullptr;

  const Portal* currentPortal = nullptr;

  SurfaceCandidates surfaceCandidates = {};
  SurfaceCandidates::const_iterator surfaceCandidate = surfaceCandidates.cend();

  BoundaryCheck surfaceBoundaryCheck = true;

  ActsScalar overstepTolerance = -0.1;

  std::any auxiliary;
};

}  // namespace Experimental
}  // namespace Acts