ceph/src/boost/libs/geometry/doc/src/examples/algorithms/append.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 //[append
  11 //` Shows usage of Boost.Geometry's append to append a point or a range to a polygon
  12
  13 #include <iostream>
  14
  15 #include <boost/assign.hpp>
  16
  17 #include <boost/geometry.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     using boost::assign::tuple_list_of;
  26     using boost::make_tuple;
  27     using boost::geometry::append;
  28
  29     typedef boost::geometry::model::polygon<boost::tuple<int, int> > polygon;
  30
  31     polygon poly;
  32
  33     // Append a range
  34     append(poly, tuple_list_of(0, 0)(0, 10)(11, 11)(10, 0)); /*< tuple_list_of delivers a range and can therefore be used in boost::geometry::append >*/
  35     // Append a point (in this case the closing point)
  36     append(poly, make_tuple(0, 0));
  37
  38     // Create an interior ring (append does not do this automatically)
  39     boost::geometry::interior_rings(poly).resize(1);
  40
  41     // Append a range to the interior ring
  42     append(poly, tuple_list_of(2, 2)(2, 5)(6, 6)(5, 2), 0); /*< The last parameter ring_index 0 denotes the first interior ring >*/
  43     // Append a point to the first interior ring
  44     append(poly, make_tuple(2, 2), 0);
  45
  46     std::cout << boost::geometry::dsv(poly) << std::endl;
  47
  48     return 0;
  49 }
  50
  51 //]
  52
  53
  54 //[append_output
  55 /*`
  56 Output:
  57 [pre
  58 (((0, 0), (0, 10), (11, 11), (10, 0), (0, 0)), ((2, 2), (2, 5), (6, 6), (5, 2), (2, 2)))
  59 ]
  60 */
  61 //]