Boost C++ Libraries

Macro to register a linestring.

Description

The macro BOOST_GEOMETRY_REGISTER_LINESTRING registers a linestring such that it is recognized by Boost.Geometry and that Boost.Geometry functionality can used with the specified type. The linestring may contain template parameters, which must be specified then.

Synopsis

#define BOOST_GEOMETRY_REGISTER_LINESTRING(Linestring)

Parameters

Header

#include <boost/geometry/geometries/register/linestring.hpp>

Example

Show the use of BOOST_GEOMETRY_REGISTER_LINESTRING

#include <iostream>

#include <boost/geometry.hpp>
#include <boost/geometry/geometries/point_xy.hpp>
#include <boost/geometry/geometries/register/linestring.hpp>

typedef boost::geometry::model::d2::point_xy<double> point_2d;

BOOST_GEOMETRY_REGISTER_LINESTRING(std::vector<point_2d>)

int main()
{
    // Normal usage of std::
    std::vector<point_2d> line;
    line.push_back(point_2d(1, 1));
    line.push_back(point_2d(2, 2));
    line.push_back(point_2d(3, 1));

    // Usage of Boost.Geometry's length and wkt functions
    std::cout << "Length: "
        << boost::geometry::length(line)
        << std::endl;

    std::cout << "WKT: "
        << boost::geometry::wkt(line)
        << std::endl;

    return 0;
}

Output:

Length: 2.82843
WKT: LINESTRING(1 1,2 2,3 1)