// Boost.Geometry (aka GGL, Generic Geometry Library) // QuickBook Example // Copyright (c) 2013, 2014 Barend Gehrels, Amsterdam, the Netherlands. // Use, modification and distribution is subject to the Boost Software License, // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at // http://www.boost.org/LICENSE_1_0.txt) //[buffer_with_strategies //` Shows how the buffer algorithm can be used to create a buffer of a linestring, a multi point, a multi polygon #include <boost/geometry.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/geometries.hpp> /*<-*/ #include "../examples_utils/create_svg_buffer.hpp" /*->*/ int main() { typedef double coordinate_type; typedef boost::geometry::model::d2::point_xy<coordinate_type> point; typedef boost::geometry::model::polygon<point> polygon; // Declare strategies const double buffer_distance = 1.0; const int points_per_circle = 36; boost::geometry::strategy::buffer::distance_symmetric<coordinate_type> distance_strategy(buffer_distance); boost::geometry::strategy::buffer::join_round join_strategy(points_per_circle); boost::geometry::strategy::buffer::end_round end_strategy(points_per_circle); boost::geometry::strategy::buffer::point_circle circle_strategy(points_per_circle); boost::geometry::strategy::buffer::side_straight side_strategy; // Declare output boost::geometry::model::multi_polygon<polygon> result; // Declare/fill a linestring boost::geometry::model::linestring<point> ls; boost::geometry::read_wkt("LINESTRING(0 0,4 5,7 4,10 6)", ls); // Create the buffer of a linestring boost::geometry::buffer(ls, result, distance_strategy, side_strategy, join_strategy, end_strategy, circle_strategy); /*<-*/ create_svg_buffer("buffer_linestring.svg", ls, result); /*->*/ // Declare/fill a multi point boost::geometry::model::multi_point<point> mp; boost::geometry::read_wkt("MULTIPOINT((3 3),(4 4),(6 2))", mp); // Create the buffer of a multi point boost::geometry::buffer(mp, result, distance_strategy, side_strategy, join_strategy, end_strategy, circle_strategy); /*<-*/ create_svg_buffer("buffer_multi_point.svg", mp, result); /*->*/ // Declare/fill a multi_polygon boost::geometry::model::multi_polygon<polygon> mpol; boost::geometry::read_wkt("MULTIPOLYGON(((0 1,2 5,5 3,0 1)),((1 1,5 2,5 0,1 1)))", mpol); // Create the buffer of a multi polygon boost::geometry::buffer(mpol, result, distance_strategy, side_strategy, join_strategy, end_strategy, circle_strategy); /*<-*/ create_svg_buffer("buffer_multi_polygon.svg", mpol, result); /*->*/ return 0; } //]