Boost C++ Libraries

Parses OGC Well-Known Text (WKT (Well-Known Text)) into a geometry (any geometry)

Synopsis

template<typename Geometry>
void read_wkt(std::string const & wkt, Geometry & geometry)

Parameters

Header

Either

#include <boost/geometry.hpp>

Or

#include <boost/geometry/io/wkt/read.hpp>

Conformance

Other libraries refer to this functionality as ST_GeomFromText or STGeomFromText. That is not done here because Boost.Geometry support more text formats. The name GeomFromText is reserved for future usage, which will then have an indication of the used text format.

Example

Shows the usage of read_wkt

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

int main()
{
    typedef boost::geometry::model::d2::point_xy<double> point_type;

    point_type a;
    boost::geometry::model::linestring<point_type> b;
    boost::geometry::model::polygon<point_type> c;
    boost::geometry::model::box<point_type> d;
    boost::geometry::model::segment<point_type> e;

    boost::geometry::read_wkt("POINT(1 2)", a);
    boost::geometry::read_wkt("LINESTRING(0 0,2 2,3 1)", b);
    boost::geometry::read_wkt("POLYGON((0 0,0 7,4 2,2 0,0 0))", c);
    boost::geometry::read_wkt("BOX(0 0,3 3)", d);
    boost::geometry::read_wkt("SEGMENT(1 0,3 4)", e);

    return 0;
}

See also