Channelizer.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/Geometry/GeometryContext.hpp"

#include <array>
#include <utility>
#include <vector>

namespace Acts {
class BinUtility;
class Surface;
}  // namespace Acts

namespace ActsFatras {

struct Channelizer {
  using Segment2D = std::array<Acts::Vector2, 2>;
  using Bin2D = std::array<unsigned int, 2>;
  using BinDelta2D = std::array<int, 2>;

  struct ChannelStep {
    BinDelta2D delta = {0, 0};
    Acts::Vector2 intersect;
    double path = 0.;

    ChannelStep(BinDelta2D delta_, Acts::Vector2 intersect_,
                const Acts::Vector2& start)
        : delta(delta_),
          intersect(std::move(intersect_)),
          path((intersect - start).norm()) {}

    bool operator<(const ChannelStep& cstep) const { return path < cstep.path; }
  };

  struct ChannelSegment {
    Bin2D bin = {0, 0};
    Segment2D path2D;
    double activation = 0.;

    ChannelSegment(Bin2D bin_, Segment2D path2D_, double activation_)
        : bin(bin_), path2D(std::move(path2D_)), activation(activation_) {}
  };

  std::vector<ChannelSegment> segments(const Acts::GeometryContext& geoCtx,
                                       const Acts::Surface& surface,
                                       const Acts::BinUtility& segmentation,
                                       const Segment2D& segment) const;
};

}  // namespace ActsFatras