ceph/src/boost/libs/geometry/doc/src/examples/geometries/register/linestring.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_linestring
  11 //` Show the use of BOOST_GEOMETRY_REGISTER_LINESTRING
  12
  13 #include <iostream>
  14
  15 #include <boost/geometry.hpp>
  16 #include <boost/geometry/geometries/point_xy.hpp>
  17 #include <boost/geometry/geometries/register/linestring.hpp>
  18
  19 typedef boost::geometry::model::d2::point_xy<double> point_2d;
  20
  21 BOOST_GEOMETRY_REGISTER_LINESTRING(std::vector<point_2d>)
  22
  23 int main()
  24 {
  25     // Normal usage of std::
  26     std::vector<point_2d> line;
  27     line.push_back(point_2d(1, 1));
  28     line.push_back(point_2d(2, 2));
  29     line.push_back(point_2d(3, 1));
  30
  31     // Usage of Boost.Geometry's length and wkt functions
  32     std::cout << "Length: "
  33         << boost::geometry::length(line)
  34         << std::endl;
  35
  36     std::cout << "WKT: "
  37         << boost::geometry::wkt(line)
  38         << std::endl;
  39
  40     return 0;
  41 }
  42
  43 //]
  44
  45
  46 //[register_linestring_output
  47 /*`
  48 Output:
  49 [pre
  50 Length: 2.82843
  51 WKT: LINESTRING(1 1,2 2,3 1)
  52 ]
  53 */
  54 //]