...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Create a circular buffer around a point.
This strategy can be used as PointStrategy for the buffer algorithm. It creates a circular buffer around a point. It can be applied for points and multi_points, but also for a linestring (if it is degenerate, so consisting of only one point) and for polygons (if it is degenerate). This strategy is only applicable for Cartesian coordinate systems.
class strategy::buffer::point_circle { // ... };
Function 
Description 
Parameters 

point_circle(std::size_t count = 90)

Constructs the strategy. 
std::size_t: count: number of points for the created circle (if count is smaller than 3, count is internally set to 3) 
#include <boost/geometry/strategies/cartesian/buffer_point_circle.hpp>
Shows how the point_circle strategy can be used as a PointStrategy to create circular buffers around points
#include <boost/geometry.hpp> #include <boost/geometry/geometries/point_xy.hpp> #include <boost/geometry/geometries/geometries.hpp> int main() { typedef boost::geometry::model::d2::point_xy<double> point; typedef boost::geometry::model::polygon<point> polygon; // Declare the point_circle strategy boost::geometry::strategy::buffer::point_circle point_strategy(360); // Declare other strategies boost::geometry::strategy::buffer::distance_symmetric<double> distance_strategy(0.7); boost::geometry::strategy::buffer::join_round join_strategy; boost::geometry::strategy::buffer::end_round end_strategy; boost::geometry::strategy::buffer::side_straight side_strategy; // Declare/fill of a multi point boost::geometry::model::multi_point<point> mp; boost::geometry::read_wkt("MULTIPOINT((3 3),(3 4),(4 4),(7 3))", mp); // Create the buffer of a multi point boost::geometry::model::multi_polygon<polygon> result; boost::geometry::buffer(mp, result, distance_strategy, side_strategy, join_strategy, end_strategy, point_strategy); return 0; }