| // Boost.Geometry (aka GGL, Generic Geometry Library) |
| // QuickBook Example |
| |
| // Copyright (c) 2011 Barend Gehrels, Amsterdam, the Netherlands. |
| |
| // 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) |
| |
| //[register_point_2d |
| //` Show the use of the macro BOOST_GEOMETRY_REGISTER_POINT_2D |
| |
| #include <iostream> |
| #include <boost/geometry.hpp> |
| #include <boost/geometry/geometries/register/point.hpp> |
| |
| /*< Somewhere, any legacy point struct is defined >*/ |
| struct legacy_point |
| { |
| double x, y; |
| }; |
| |
| BOOST_GEOMETRY_REGISTER_POINT_2D(legacy_point, double, cs::cartesian, x, y) /*< The magic: adapt it to Boost.Geometry Point Concept >*/ |
| |
| int main() |
| { |
| legacy_point p1, p2; |
| |
| namespace bg = boost::geometry; |
| |
| /*< Any Boost.Geometry function can be used for legacy point now. Here: assign_values and distance >*/ |
| 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; |
| } |
| |
| //] |
| |
| |
| //[register_point_2d_output |
| /*` |
| Output: |
| [pre |
| Distance: 1.41421 |
| ] |
| */ |
| //] |
