Пусть буфер для выстроек будет асимметричным.

Synopsis

template<typename NumericType>
class strategy::buffer::distance_asymmetric
{
  // ...
};

Template parameter(s)

Constructor(s)

distance_asymmetric(NumericType const & left, NumericType const & right)

distance_asymmetric(NumericType const & left, NumericType const & right)

Header

#include <boost/geometry/strategies/agnostic/buffer_distance_asymmetric.hpp>

Example

Показывает, как стратегия дистанции_асимметрии может использоваться в качестве дистанционной стратегии для создания асимметричных буферов

#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::linestring<point> linestring;
    typedef boost::geometry::model::polygon<point> polygon;
    // Declare the asymmetric distance strategy
    boost::geometry::strategy::buffer::distance_asymmetric<double> distance_strategy(1.0, 0.5);
    // Declare other strategies
    boost::geometry::strategy::buffer::side_straight side_strategy;
    boost::geometry::strategy::buffer::join_round join_strategy;
    boost::geometry::strategy::buffer::end_round end_strategy;
    boost::geometry::strategy::buffer::point_circle point_strategy;
    // Declare/fill a multi linestring
    boost::geometry::model::multi_linestring<linestring> ml;
    boost::geometry::read_wkt("MULTILINESTRING((3 5,5 10,7 5),(7 7,11 10,15 7,19 10))", ml);
    // Create the buffered geometry with left/right a different distance
    boost::geometry::model::multi_polygon<polygon> result;
    boost::geometry::buffer(ml, result,
                distance_strategy, side_strategy,
                join_strategy, end_strategy, point_strategy);
    return 0;
}

Output

See also