libs/geometry/doc/src/examples/core/closure.cpp

   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
  19 int 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 //]