RootBFieldWriter.hpp

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// This file is part of the Acts project.
//
// Copyright (C) 2017-2021 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/Units.hpp"
#include "Acts/MagneticField/InterpolatedBFieldMap.hpp"
#include "Acts/Utilities/Logger.hpp"
#include "ActsExamples/Framework/ProcessCode.hpp"

#include <array>
#include <cstddef>
#include <ios>
#include <memory>
#include <mutex>
#include <optional>
#include <sstream>
#include <stdexcept>
#include <string>

#include <TFile.h>
#include <TTree.h>
#include <boost/optional.hpp>

namespace Acts {
class InterpolatedMagneticField;
}  // namespace Acts

namespace ActsExamples {

class RootBFieldWriter {
 public:
  enum class GridType { rz = 0, xyz = 1 };

  struct Config {
    std::string treeName = "TTree";
    std::string fileName = "TFile.root";
    std::string fileMode = "recreate";
    std::shared_ptr<const Acts::InterpolatedMagneticField> bField;
    GridType gridType = GridType::xyz;
    std::optional<std::array<double, 2>> rBounds;
    std::optional<std::array<double, 2>> zBounds;
    size_t rBins = 200;
    // @note setting this parameter is optional, in case no bin numbers are
    size_t zBins = 300;
    // @note setting this parameter is optional, in case no bin numbers are
    size_t phiBins = 100;
  };

  static void run(const Config& config,
                  std::unique_ptr<const Acts::Logger> p_logger =
                      Acts::getDefaultLogger("RootBFieldWriter",
                                             Acts::Logging::INFO));
};

}  // namespace ActsExamples