| // 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_multi_polygon |
| //` Show the use of the macro BOOST_GEOMETRY_REGISTER_MULTI_POLYGON |
| |
| #include <iostream> |
| |
| #include <boost/geometry.hpp> |
| #include <boost/geometry/geometries/polygon.hpp> |
| #include <boost/geometry/geometries/adapted/boost_tuple.hpp> |
| #include <boost/geometry/multi/geometries/register/multi_polygon.hpp> |
| |
| typedef boost::geometry::model::polygon |
| < |
| boost::tuple<float, float> |
| > polygon_type; |
| |
| BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian) |
| BOOST_GEOMETRY_REGISTER_MULTI_POLYGON(std::vector<polygon_type>) |
| |
| int main() |
| { |
| // Normal usage of std:: |
| std::vector<polygon_type> polygons(2); |
| boost::geometry::read_wkt("POLYGON((0 0,0 1,1 1,1 0,0 0))", polygons[0]); |
| boost::geometry::read_wkt("POLYGON((3 0,3 1,4 1,4 0,3 0))", polygons[1]); |
| |
| // Usage of Boost.Geometry |
| std::cout << "AREA: " << boost::geometry::area(polygons) << std::endl; |
| |
| return 0; |
| } |
| |
| //] |
| |
| |
| //[register_multi_polygon_output |
| /*` |
| Output: |
| [pre |
| AREA: 2 |
| ] |
| */ |
| //] |