1 // Boost.Geometry (aka GGL, Generic Geometry Library) 2 // QuickBook Example 3 4 // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands. 5 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) 9 10 //[closure 11 //` Examine if a polygon is defined as "should be closed" 12 13 #include <iostream> 14 15 #include <boost/geometry.hpp> 16 #include <boost/geometry/geometries/polygon.hpp> 17 #include <boost/geometry/geometries/point_xy.hpp> 18 main()19int main() 20 { 21 typedef boost::geometry::model::d2::point_xy<double> point_type; 22 typedef boost::geometry::model::polygon<point_type> polygon_type; 23 24 boost::geometry::closure_selector clos = boost::geometry::closure<polygon_type>::value; 25 26 std::cout << "closure: " << clos << std::endl 27 << "(open = " << boost::geometry::open 28 << ", closed = " << boost::geometry::closed 29 << ") "<< std::endl; 30 31 return 0; 32 } 33 34 //] 35 36 37 //[closure_output 38 /*` 39 Output: 40 [pre 41 closure: 1 42 (open = 0, closed = 1) 43 ] 44 */ 45 //] 46