ceph/src/boost/libs/geometry/doc/src/examples/views/segment_view.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 //[segment_view
  11 //` Shows usage of the Boost.Range compatible view on a box
  12
  13 #include <iostream>
  14
  15 #include <boost/geometry.hpp>
  16
  17
  18 int main()
  19 {
  20     typedef boost::geometry::model::segment
  21         <
  22             boost::geometry::model::point<double, 2, boost::geometry::cs::cartesian>
  23         > segment_type;
  24
  25     typedef boost::geometry::segment_view<segment_type> segment_view;
  26
  27     segment_type segment;
  28     boost::geometry::assign_values(segment, 0, 0, 1, 1);
  29
  30     segment_view view(segment);
  31
  32     // Iterating over the points of this segment
  33     for (boost::range_iterator<segment_view const>::type it = boost::begin(view);
  34         it != boost::end(view); ++it)
  35     {
  36         std::cout << " " << boost::geometry::dsv(*it);
  37     }
  38     std::cout << std::endl;
  39
  40     // Note that a segment_view is tagged as a linestring, so supports length etc.
  41     std::cout << "Length: " << boost::geometry::length(view) << std::endl;
  42
  43     return 0;
  44 }
  45
  46 //]
  47
  48
  49 //[segment_view_output
  50 /*`
  51 Output:
  52 [pre
  53  (0, 0) (0, 4) (4, 4) (4, 0) (0, 0)
  54 Area: 16
  55 ]
  56 */
  57 //]