ceph/src/boost/libs/geometry/doc/src/examples/geometries/adapted/boost_polygon_polygon.cpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2 // QuickBook Example
   3
   4 // Copyright (c) 2011-2012 Barend Gehrels, Amsterdam, the Netherlands.
   5 // Copyright (c) 2014 Adam Wulkiewicz, Lodz, Poland.
   6
   7 // Use, modification and distribution is subject to the Boost Software License,
   8 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   9 // http://www.boost.org/LICENSE_1_0.txt)
  10
  11 //[boost_polygon_polygon
  12 //`Shows how to use Boost.Polygon polygon_with_holes_data within Boost.Geometry
  13
  14 #include <iostream>
  15 #include <boost/geometry.hpp>
  16 #include <boost/geometry/geometries/adapted/boost_polygon.hpp>
  17
  18 int main()
  19 {
  20     typedef boost::polygon::polygon_with_holes_data<int> polygon;
  21     typedef boost::polygon::polygon_traits<polygon>::point_type point;
  22     typedef boost::polygon::polygon_with_holes_traits<polygon>::hole_type hole;
  23
  24     point pts[5] = {
  25         boost::polygon::construct<point>(0, 0),
  26         boost::polygon::construct<point>(0, 10),
  27         boost::polygon::construct<point>(10, 10),
  28         boost::polygon::construct<point>(10, 0),
  29         boost::polygon::construct<point>(0, 0)
  30     };
  31     point hole_pts[5] = {
  32         boost::polygon::construct<point>(1, 1),
  33         boost::polygon::construct<point>(9, 1),
  34         boost::polygon::construct<point>(9, 9),
  35         boost::polygon::construct<point>(1, 9),
  36         boost::polygon::construct<point>(1, 1)
  37     };
  38
  39     hole hls[1];
  40     boost::polygon::set_points(hls[0], hole_pts, hole_pts+5);
  41
  42     polygon poly;
  43     boost::polygon::set_points(poly, pts, pts+5);
  44     boost::polygon::set_holes(poly, hls, hls+1);
  45
  46     std::cout << "Area (using Boost.Geometry): "
  47         << boost::geometry::area(poly) << std::endl;
  48     std::cout << "Area (using Boost.Polygon): "
  49         << boost::polygon::area(poly) << std::endl;
  50
  51     return 0;
  52 }
  53
  54 //]
  55
  56 //[boost_polygon_polygon_output
  57 /*`
  58 Output:
  59 [pre
  60 Area (using Boost.Geometry): 36
  61 Area (using Boost.Polygon): 36
  62 ]
  63 */
  64 //]