Boost C++ Libraries

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BOOST_GEOMETRY_REGISTER_POINT_2D

Macro to register a 2D point type.

Description

The macro BOOST_GEOMETRY_REGISTER_POINT_2D registers a two-dimensional point type such that it is recognized by Boost.Geometry and that Boost.Geometry functionality can used with the specified type.

Synopsis

#define BOOST_GEOMETRY_REGISTER_POINT_2D(Point, CoordinateType, CoordinateSystem,
                                  Field0, Field1)

Parameters

Name	Description
Point	Point type to be registered
CoordinateType	Type of the coordinates of the point (e.g. double)
CoordinateSystem	Coordinate system (e.g. cs::cartesian)
Field0	Member containing first (usually x) coordinate
Field1	Member containing second (usually y) coordinate

Header

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

	Caution
	Use the macro outside any namespace

	Note
	A point can include a namespace

Examples

Show the use of the macro BOOST_GEOMETRY_REGISTER_POINT_2D

#include <iostream>
#include <boost/geometry.hpp>
#include <boost/geometry/geometries/register/point.hpp>


struct legacy_point
{
    double x, y;
};

BOOST_GEOMETRY_REGISTER_POINT_2D(legacy_point, double, cs::cartesian, x, y) 

int main()
{
    legacy_point p1, p2;

    namespace bg = boost::geometry;

    
    bg::assign_values(p1, 1, 1);
    bg::assign_values(p2, 2, 2);

    double d = bg::distance(p1, p2);

    std::cout << "Distance: " << d << std::endl;

    return 0;
}

	Somewhere, any legacy point struct is defined
	The magic: adapt it to Boost.Geometry Point Concept
	Any Boost.Geometry function can be used for legacy point now. Here: assign_values and distance

Output:

Distance: 1.41421