ceph/src/boost/libs/geometry/doc/src/examples/algorithms/num_geometries.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 //[num_geometries
  11 //` Get the number of geometries making up a multi-geometry
  12
  13 #include <iostream>
  14
  15 #include <boost/geometry.hpp>
  16 #include <boost/geometry/geometries/point_xy.hpp>
  17 #include <boost/geometry/geometries/polygon.hpp>
  18 #include <boost/geometry/geometries/multi_polygon.hpp>
  19
  20
  21 int main()
  22 {
  23     boost::geometry::model::multi_polygon
  24         <
  25             boost::geometry::model::polygon
  26                 <
  27                     boost::geometry::model::d2::point_xy<double>
  28                 >
  29         > mp;
  30     boost::geometry::read_wkt("MULTIPOLYGON(((0 0,0 10,10 0,0 0),(1 1,1 9,9 1,1 1)),((10 10,10 7,7 10,10 10)))", mp);
  31     std::cout << "Number of geometries: " << boost::geometry::num_geometries(mp) << std::endl;
  32
  33     return 0;
  34 }
  35
  36 //]
  37
  38
  39 //[num_geometries_output
  40 /*`
  41 Output:
  42 [pre
  43  Number of geometries: 2
  44 ]
  45 */
  46 //]