Boost C++ Libraries

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BOOST_GEOMETRY_REGISTER_BOX_2D_4VALUES

Macro to register a box.

Description

The macro BOOST_GEOMETRY_REGISTER_BOX_2D_4VALUES registers a box such that it is recognized by Boost.Geometry and that Boost.Geometry functionality can used with the specified type.

Synopsis

#define BOOST_GEOMETRY_REGISTER_BOX_2D_4VALUES(Box, Point, Left, Bottom, Right, Top)

Parameters

Name

Description

Box

Box type to be registered

Point

Point type reported as point_type by box. Must be two dimensional. Note that these box tyeps do not contain points, but they must have a related point_type

Left

Left side (must be public member or method)

Bottom

Bottom side (must be public member or method)

Right

Right side (must be public member or method)

Top

Top side (must be public member or method)

Header

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

Example

Show the use of the macro BOOST_GEOMETRY_REGISTER_BOX_2D_4VALUES

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

struct my_point
{
    int x, y;
};

struct my_box
{
    int left, top, right, bottom;
};

BOOST_GEOMETRY_REGISTER_POINT_2D(my_point, int, cs::cartesian, x, y)

// Register the box type, also notifying that it is based on "my_point"
// (even if it does not contain it)
BOOST_GEOMETRY_REGISTER_BOX_2D_4VALUES(my_box, my_point, left, top, right, bottom)

int main()
{
    my_box b = boost::geometry::make<my_box>(0, 0, 2, 2);
    std::cout << "Area: "  << boost::geometry::area(b) << std::endl;
    return 0;
}

Output:

Area: 4

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