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- // Boost.Geometry (aka GGL, Generic Geometry Library)
- // Copyright (c) 2007-2012 Barend Gehrels, Amsterdam, the Netherlands.
- // Copyright (c) 2008-2012 Bruno Lalande, Paris, France.
- // Copyright (c) 2009-2012 Mateusz Loskot, London, UK.
- // Use, modification and distribution is subject to the Boost Software License,
- // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
- // http://www.boost.org/LICENSE_1_0.txt)
- //
- // Custom Linestring Example
- #include <iostream>
- #include <string>
- #include <vector>
- #include <boost/geometry/geometry.hpp>
- #include <boost/geometry/geometries/register/point.hpp>
- #include <boost/geometry/geometries/register/linestring.hpp>
- #include <boost/geometry/extensions/algorithms/parse.hpp>
- // Define a GPS point with coordinates in latitude/longitude and some additional values
- struct gps_point
- {
- double latitude, longitude, height;
- double speed;
- // Date/time, heading, etc could be added
- // The default constructor is required if being used in a vector
- gps_point() {}
- // Define a constructor to create the point in one line. Order of latitude/longitude
- // does not matter as long as "E", "N", etc are included
- gps_point(std::string const& c1, std::string const& c2, double h, double s)
- : height(h)
- , speed(s)
- {
- boost::geometry::parse(*this, c1, c2);
- }
- };
- // Declare a custom linestring which will have the GPS points
- struct gps_track : std::vector<gps_point>
- {
- std::string owner;
- int route_identifier;
- // etc
- gps_track(int i, std::string const& o)
- : owner(o)
- , route_identifier(i)
- {}
- };
- // Register this point as being a recognizable point by Boost.Geometry
- BOOST_GEOMETRY_REGISTER_POINT_2D(gps_point, double, cs::geographic<degree>, longitude, latitude)
- // Register the track as well, as being a "linestring"
- BOOST_GEOMETRY_REGISTER_LINESTRING(gps_track)
- int main()
- {
- // Declare a "GPS Track" and add some GPS points
- gps_track track(23, "Mister G");
- track.push_back(gps_point("52 22 23 N", "4 53 32 E", 50, 180));
- track.push_back(gps_point("52 10 00 N", "4 59 59 E", 110, 170));
- track.push_back(gps_point("52 5 20 N", "5 6 56 E", 0, 90));
- std::cout
- << "track: " << track.route_identifier << std::endl
- << "from: " << track.owner << std::endl
- << "as wkt: " << boost::geometry::dsv(track) << std::endl
- << "length: " << boost::geometry::length(track)/1000.0 << " km" << std::endl;
- // Above gives the idea, shows that custom linestrings can be useful.
- // We could of course do anything with this track which the library can handle, e.g.:
- // - simplify it
- // - calculate distance of point-to-line
- // - project it to UTM, then transform it to a GIF image (see p03_example)
- return 0;
- }
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