libs/geometry/doc/src/examples/geometries/register/multi_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
   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 //[register_multi_polygon
  11 //` Show the use of the macro BOOST_GEOMETRY_REGISTER_MULTI_POLYGON
  12
  13 #include <iostream>
  14
  15 #include <boost/geometry.hpp>
  16 #include <boost/geometry/geometries/polygon.hpp>
  17 #include <boost/geometry/geometries/adapted/boost_tuple.hpp>
  18 #include <boost/geometry/geometries/register/multi_polygon.hpp>
  19
  20 typedef boost::geometry::model::polygon
  21     <
  22         boost::tuple<float, float>
  23     > polygon_type;
  24
  25 BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian)
  26 BOOST_GEOMETRY_REGISTER_MULTI_POLYGON(std::vector<polygon_type>)
  27
  28 int main()
  29 {
  30     // Normal usage of std::
  31     std::vector<polygon_type> polygons(2);
  32     boost::geometry::read_wkt("POLYGON((0 0,0 1,1 1,1 0,0 0))", polygons[0]);
  33     boost::geometry::read_wkt("POLYGON((3 0,3 1,4 1,4 0,3 0))", polygons[1]);
  34
  35     // Usage of Boost.Geometry
  36     std::cout << "AREA: "  << boost::geometry::area(polygons) << std::endl;
  37
  38     return 0;
  39 }
  40
  41 //]
  42
  43
  44 //[register_multi_polygon_output
  45 /*`
  46 Output:
  47 [pre
  48 AREA: 2
  49 ]
  50 */
  51 //]