ceph/src/boost/libs/geometry/doc/src/examples/algorithms/simplify_insert.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 //[simplify_inserter
  11 //` Simplify a linestring using a back inserter
  12
  13 #include <iostream>
  14
  15 #include <boost/geometry.hpp>
  16 #include <boost/geometry/geometries/linestring.hpp>
  17 #include <boost/geometry/geometries/point_xy.hpp>
  18
  19 int main()
  20 {
  21     typedef boost::geometry::model::d2::point_xy<double> P;
  22     typedef boost::geometry::model::linestring<P> L;
  23
  24     L line;
  25     line.push_back(P(1.1, 1.1));
  26     line.push_back(P(2.5, 2.1));
  27     line.push_back(P(3.1, 3.1));
  28     line.push_back(P(4.9, 1.1));
  29     line.push_back(P(3.1, 1.9));
  30
  31     L simplified;
  32     boost::geometry::simplify_inserter(line, std::back_inserter(simplified), 0.5);
  33
  34     std::cout
  35         << "  original: " << boost::geometry::dsv(line) << std::endl
  36         << "simplified: " << boost::geometry::dsv(simplified) << std::endl;
  37
  38     return 0;
  39 }
  40
  41 //]
  42
  43
  44 //[simplify_inserter_output
  45 /*`
  46 Output:
  47 [pre
  48   original: ((1.1, 1.1), (2.5, 2.1), (3.1, 3.1), (4.9, 1.1), (3.1, 1.9))
  49 simplified: ((1.1, 1.1), (3.1, 3.1), (4.9, 1.1), (3.1, 1.9))
  50 ]
  51 */
  52 //]