ceph/src/boost/libs/geometry/doc/src/examples/algorithms/assign.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
  11 //` Shows how to assign a geometry from another geometry
  12
  13 #include <iostream>
  14
  15 #include <boost/geometry.hpp>
  16 #include <boost/geometry/geometries/box.hpp>
  17 #include <boost/geometry/geometries/point_xy.hpp>
  18 #include <boost/geometry/geometries/polygon.hpp>
  19 #include <boost/geometry/geometries/adapted/boost_tuple.hpp>
  20
  21 BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian)
  22
  23 int main()
  24 {
  25     typedef boost::geometry::model::d2::point_xy<double> point;
  26     typedef boost::geometry::model::box<point> box;
  27     typedef boost::geometry::model::polygon<point> polygon;
  28
  29     point p1;
  30     box b;
  31     boost::geometry::assign_values(p1, 1, 1);
  32     boost::geometry::assign_values(b, 1, 1, 2, 2);
  33
  34     // Assign a box to a polygon (target = source)
  35     polygon p;
  36     boost::geometry::assign(p, b);
  37
  38     // Assign a point to another point type (conversion of point-type)
  39     boost::tuple<double, double> p2;
  40     boost::geometry::assign(p2, p1);
  41
  42     using boost::geometry::dsv;
  43     std::cout
  44         << "box: " << dsv(b) << std::endl
  45         << "polygon: " << dsv(p) << std::endl
  46         << "point: " << dsv(p1) << std::endl
  47         << "point tuples: " << dsv(p2) << std::endl
  48         ;
  49
  50     return 0;
  51 }
  52
  53 //]
  54
  55
  56 //[assign_output
  57 /*`
  58 Output:
  59 [pre
  60 box: ((1, 1), (2, 2))
  61 polygon: (((1, 1), (1, 2), (2, 2), (2, 1), (1, 1)))
  62 point: (1, 1)
  63 point tuples: (1, 1)
  64 ]
  65 */
  66 //]