ceph/src/boost/libs/geometry/doc/src/examples/algorithms/return_envelope.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 //[return_envelope
  11 //` Shows how to return the envelope of a ring
  12
  13 #include <iostream>
  14
  15
  16 #include <boost/geometry.hpp>
  17 #include <boost/geometry/geometries/box.hpp>
  18 #include <boost/geometry/geometries/point_xy.hpp>
  19 #include <boost/geometry/geometries/ring.hpp>
  20
  21 #include <boost/assign.hpp>
  22
  23 /*<-*/ #include "create_svg_two.hpp" /*->*/
  24
  25 int main()
  26 {
  27     using namespace boost::assign;
  28
  29     typedef boost::geometry::model::d2::point_xy<double> point;
  30
  31     boost::geometry::model::ring<point> ring;
  32     ring +=
  33         point(4.0, -0.5), point(3.5, 1.0),
  34         point(2.0, 1.5), point(3.5, 2.0),
  35         point(4.0, 3.5), point(4.5, 2.0),
  36         point(6.0, 1.5), point(4.5, 1.0),
  37         point(4.0, -0.5);
  38
  39     typedef boost::geometry::model::box<point> box;
  40
  41     std::cout
  42         << "return_envelope:"
  43         << boost::geometry::dsv(boost::geometry::return_envelope<box>(ring))
  44         << std::endl;
  45
  46     /*<-*/ create_svg("return_envelope.svg", ring, boost::geometry::return_envelope<box>(ring)); /*->*/
  47     return 0;
  48 }
  49
  50 //]
  51
  52
  53 //[return_envelope_output
  54 /*`
  55 Output:
  56 [pre
  57 return_envelope:((2, -0.5), (6, 3.5))
  58
  59 [$img/algorithms/return_envelope.png]
  60 ]
  61 */
  62 //]
  63