wkb.hpp

#ifndef NGEN_GEOPACKAGE_WKB_H
#define NGEN_GEOPACKAGE_WKB_H
 
#include "EndianCopy.hpp"
#include "JSONGeometry.hpp"
#include <boost/geometry/srs/epsg.hpp>
#include <boost/geometry/srs/transformation.hpp>
 
namespace bg = boost::geometry;
 
namespace ngen {
namespace geopackage {
 
struct wkb {
    using point_t = bg::model::point<double, 2, bg::cs::cartesian>;
    using linestring_t = bg::model::linestring<point_t>;
    using polygon_t = bg::model::polygon<point_t>;
    using multipoint_t = bg::model::multi_point<point_t>;
    using multilinestring_t = bg::model::multi_linestring<linestring_t>;
    using multipolygon_t = bg::model::multi_polygon<polygon_t>;
    using geometry = boost::variant<
        point_t,
        linestring_t,
        polygon_t,
        multipoint_t,
        multilinestring_t,
        multipolygon_t
    >;
 
    using byte_t = uint8_t;
    using byte_vector = std::vector<byte_t>;
 
    struct wgs84;
 
    // prevent instatiation of this struct
    wkb() = delete;
 
    static geometry read(const boost::span<const uint8_t> buffer);
 
  private:
    static point_t read_point(const boost::span<const uint8_t>, int&, uint8_t);
 
    static linestring_t read_linestring(const boost::span<const uint8_t>, int&, uint8_t);
 
    static polygon_t read_polygon(const boost::span<const uint8_t>, int&, uint8_t);
 
    static multipoint_t read_multipoint(const boost::span<const uint8_t>, int&, uint8_t);
 
    static multilinestring_t read_multilinestring(const boost::span<const uint8_t>, int&, uint8_t);
 
    static multipolygon_t read_multipolygon(const boost::span<const uint8_t>, int&, uint8_t);
};
 
struct wkb::wgs84 : public boost::static_visitor<geojson::geometry>
{
    wgs84(uint32_t srs, const bg::srs::transformation<>& tr)
        : srs(srs)
        , tr(tr) {};
 
    geojson::geometry operator()(point_t& g);
    geojson::geometry operator()(linestring_t& g);
    geojson::geometry operator()(polygon_t& g);
    geojson::geometry operator()(multipoint_t& g);
    geojson::geometry operator()(multilinestring_t& g);
    geojson::geometry operator()(multipolygon_t& g);
 
    private:
        uint32_t srs;
        const bg::srs::transformation<>& tr;
};
 
} // namespace geopackage
} // namespace ngen
 
#endif // NGEN_GEOPACKAGE_WKB_H