ceph/src/boost/libs/geometry/doc/src/examples/algorithms/unique.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 //[unique
  11 //` Shows how to make a so-called minimal set of a polygon by removing duplicate points
  12
  13 #include <iostream>
  14
  15 #include <boost/geometry.hpp>
  16 #include <boost/geometry/geometries/polygon.hpp>
  17 #include <boost/geometry/geometries/adapted/boost_tuple.hpp>
  18
  19 BOOST_GEOMETRY_REGISTER_BOOST_TUPLE_CS(cs::cartesian)
  20
  21 int main()
  22 {
  23     boost::geometry::model::polygon<boost::tuple<double, double> > poly;
  24     boost::geometry::read_wkt("POLYGON((0 0,0 0,0 5,5 5,5 5,5 5,5 0,5 0,0 0,0 0,0 0,0 0))", poly);
  25     boost::geometry::unique(poly);
  26     std::cout << boost::geometry::wkt(poly) << std::endl;
  27
  28     return 0;
  29 }
  30
  31 //]
  32
  33
  34 //[unique_output
  35 /*`
  36 Output:
  37 [pre
  38 POLYGON((0 0,0 5,5 5,5 0,0 0))
  39 ]
  40 */
  41 //]