Config and Query classes

The Config class is used to parse and store the informations contained in the config.json configuration file. It is a simple class that contains a few member variables and a few member functions to access them.

class Config {
  private:
    std::string M_bbox;        ///< Bounding box of the area of interest
    int M_LOD;                 ///< Level of detail of the output mesh
    std::string M_output_name; ///< Name of the output file
    std::array<double, 2> M_default_height; ///< Default height range
    std::array<double, 2> M_origin;         ///< Origin of the coordinates
    std::string M_input_building_mesh;      ///< Path to the input building mesh
    std::string M_output_format;
    bool M_verbose, M_autorefine;

  public:
    Config(std::string const &filename, std::string const &gis);

    ~Config();

    // Getters
	....
};

std::ostream &operator<<(std::ostream &os, const Config &config);

//! Convert an array to a string (for printing for example)
template <typename T, std::size_t N>
std::string arrayToString(const std::array<T, N> &arr);

The Query template class is used to perform queries to the OpenStreetMap API and to create a library of trees from the JSON data returned by the API. It contains a few member functions to perform the query, get the JSON result from file, create the library of trees and initialize the trees based on the configuration and GIS data.

template <typename Mesh_type, typename Kernel_type>
void perform_query(std::string bbox, bool verbose) {
    std::string query =
        "[out:json]; (node(" + bbox + ")[\"natural\"=\"tree\"];); out;";
    if (verbose)
        std::cout << "Query: " << query << std::endl;

    cpr::Response r = cpr::Post(
        cpr::Url{"http://overpass-api.de/api/interpreter"}, cpr::Body{query},
        cpr::Header{{"Content-Type", "application/x-www-form-urlencoded"}},
        cpr::Timeout{10000} // Set a timeout of 10 seconds
    );

}

//! Get the JSON result of the query from file
inline nlohmann::json get_query_result() {...}

//! Create a library of trees from JSON data
template <typename Mesh_type, typename Kernel_type>
std::vector<Tree<Mesh_type, Kernel_type>>
createLibraryFromJson(nlohmann::json const &jsonData) {...}

//! Initialize trees based on configuration and GIS data
template <typename Mesh_type, typename Kernel_type>
std::vector<Tree<Mesh_type, Kernel_type>>
init_trees(std::string const &cfg, std::string const &gis, bool verbose) {...}

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