MeasurementCreation.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/Definitions/TrackParametrization.hpp"
#include "ActsExamples/EventData/Cluster.hpp"
#include "ActsExamples/EventData/IndexSourceLink.hpp"
#include "ActsExamples/EventData/Measurement.hpp"

#include <array>
#include <cstddef>
#include <tuple>
#include <vector>

namespace ActsExamples {
class IndexSourceLink;

struct DigitizedParameters {
  std::vector<Acts::BoundIndices> indices = {};
  std::vector<Acts::ActsScalar> values = {};
  std::vector<Acts::ActsScalar> variances = {};

  Cluster cluster;
};

Measurement createMeasurement(const DigitizedParameters& dParams,
                              const IndexSourceLink& isl) noexcept(false);

template <size_t kMeasDIM>
std::tuple<std::array<Acts::BoundIndices, kMeasDIM>, Acts::ActsVector<kMeasDIM>,
           Acts::ActsSquareMatrix<kMeasDIM>>
measurementConstituents(const DigitizedParameters& dParams) {
  std::array<Acts::BoundIndices, kMeasDIM> indices{};
  Acts::ActsVector<kMeasDIM> par;
  Acts::ActsSquareMatrix<kMeasDIM> cov =
      Acts::ActsSquareMatrix<kMeasDIM>::Identity();
  for (Eigen::Index ei = 0; ei < static_cast<Eigen::Index>(kMeasDIM); ++ei) {
    indices[ei] = dParams.indices[ei];
    par[ei] = dParams.values[ei];
    cov(ei, ei) = dParams.variances[ei];
  }
  return {indices, par, cov};
}

}  // namespace ActsExamples