ceph/src/boost/libs/geometry/doc/src/examples/strategies/buffer_point_circle.cpp

   1 // Boost.Geometry (aka GGL, Generic Geometry Library)
   2 // QuickBook Example
   3
   4 // Copyright (c) 2014 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 //[buffer_point_circle
  11 //` Shows how the point_circle strategy can be used as a PointStrategy to create circular buffers around points
  12
  13 #include <boost/geometry.hpp>
  14 #include <boost/geometry/geometries/point_xy.hpp>
  15 #include <boost/geometry/geometries/geometries.hpp>
  16 /*<-*/ #include "../examples_utils/create_svg_buffer.hpp" /*->*/
  17
  18 int main()
  19 {
  20     typedef boost::geometry::model::d2::point_xy<double> point;
  21     typedef boost::geometry::model::polygon<point> polygon;
  22
  23     // Declare the point_circle strategy
  24     boost::geometry::strategy::buffer::point_circle point_strategy(360);
  25
  26     // Declare other strategies
  27     boost::geometry::strategy::buffer::distance_symmetric<double> distance_strategy(0.7);
  28     boost::geometry::strategy::buffer::join_round join_strategy;
  29     boost::geometry::strategy::buffer::end_round end_strategy;
  30     boost::geometry::strategy::buffer::side_straight side_strategy;
  31
  32     // Declare/fill of a multi point
  33     boost::geometry::model::multi_point<point> mp;
  34     boost::geometry::read_wkt("MULTIPOINT((3 3),(3 4),(4 4),(7 3))", mp);
  35
  36     // Create the buffer of a multi point
  37     boost::geometry::model::multi_polygon<polygon> result;
  38     boost::geometry::buffer(mp, result,
  39                 distance_strategy, side_strategy,
  40                 join_strategy, end_strategy, point_strategy);
  41     /*<-*/ create_svg_buffer("buffer_point_circle.svg", mp, result); /*->*/
  42
  43     return 0;
  44 }
  45
  46 //]
  47