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git.proxmox.com Git - ceph.git/blob - ceph/src/boost/libs/geometry/doc/src/examples/algorithms/union.cpp
1 // Boost.Geometry (aka GGL, Generic Geometry Library)
4 // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands.
6 // Use, modification and distribution is subject to the Boost Software License,
7 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
8 // http://www.boost.org/LICENSE_1_0.txt)
11 //` Shows how to get a united geometry of two polygons
16 #include <boost/geometry.hpp>
17 #include <boost/geometry/geometries/point_xy.hpp>
18 #include <boost/geometry/geometries/polygon.hpp>
20 #include <boost/foreach.hpp>
21 /*<-*/ #include "create_svg_overlay.hpp" /*->*/
25 typedef boost::geometry::model::polygon
<boost::geometry::model::d2::point_xy
<double> > polygon
;
29 boost::geometry::read_wkt(
30 "POLYGON((2 1.3,2.4 1.7,2.8 1.8,3.4 1.2,3.7 1.6,3.4 2,4.1 3,5.3 2.6,5.4 1.2,4.9 0.8,2.9 0.7,2 1.3)"
31 "(4.0 2.0, 4.2 1.4, 4.8 1.9, 4.4 2.2, 4.0 2.0))", green
);
33 boost::geometry::read_wkt(
34 "POLYGON((4.0 -0.5 , 3.5 1.0 , 2.0 1.5 , 3.5 2.0 , 4.0 3.5 , 4.5 2.0 , 6.0 1.5 , 4.5 1.0 , 4.0 -0.5))", blue
);
36 std::vector
<polygon
> output
;
37 boost::geometry::union_(green
, blue
, output
);
40 std::cout
<< "green || blue:" << std::endl
;
41 BOOST_FOREACH(polygon
const& p
, output
)
43 std::cout
<< i
++ << ": " << boost::geometry::area(p
) << std::endl
;
46 /*<-*/ create_svg("union.svg", green
, blue
, output
); /*->*/
60 [$img/algorithms/union.png]