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 //[point_order 11 //` Examine the expected point order of a polygon type 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, false> polygon_type; 23 24 boost::geometry::order_selector order = boost::geometry::point_order<polygon_type>::value; 25 26 std::cout << "order: " << order << std::endl 27 << "(clockwise = " << boost::geometry::clockwise 28 << ", counterclockwise = " << boost::geometry::counterclockwise 29 << ") "<< std::endl; 30 31 return 0; 32 } 33 34 //] 35 36 37 //[point_order_output 38 /*` 39 Output: 40 [pre 41 order: 2 42 (clockwise = 1, counterclockwise = 2) 43 ] 44 */ 45 //] 46