ceph/src/boost/libs/geometry/doc/src/examples/algorithms/assign_point_from_index.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 //[assign_point_from_index
  11 //` Shows how to retrieve one point from a box (either lower-left or upper-right) or segment
  12
  13 #include <iostream>
  14
  15 #include <boost/geometry.hpp>
  16 #include <boost/geometry/geometries/point_xy.hpp>
  17 #include <boost/geometry/geometries/segment.hpp>
  18
  19 using namespace boost::geometry;
  20
  21 int main()
  22 {
  23     typedef model::d2::point_xy<double> point;
  24     typedef model::segment<point> segment;
  25
  26     segment s;
  27     assign_values(s, 1, 1, 2, 2);
  28
  29     point first, second;
  30     assign_point_from_index<0>(s, first);
  31     assign_point_from_index<1>(s, second);
  32     std::cout
  33         << "segment: " << dsv(s) << std::endl
  34         << "first: " << dsv(first) << std::endl
  35         << "second: " << dsv(second) << std::endl;
  36
  37     return 0;
  38 }
  39
  40 //]
  41
  42
  43 //[assign_point_from_index_output
  44 /*`
  45 Output:
  46 [pre
  47 segment: ((1, 1), (2, 2))
  48 first: (1, 1)
  49 second: (2, 2)
  50 ]
  51 */
  52 //]